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    • 专利摘要:
    FILTER WRAP PAPER FOR A SMOKE ARTICLE, METHOD TO PRODUCE THE SAME AND SMOKE ARTICLE WITH A FILTER CAP A filter wrap paper for a smoking article is shown, the paper having a long fiber pulp content of at least 30% by weight, preferably at least 40% by weight, relative to the pure fiber mass of the paper. The longitudinal pulp slurry as per ISO 5267, Schopper-Riegler Method, is between 80 ° SR and 100 ° SR, preferably between 85 ° SR and 95 ° SR. The filter wrap paper has a filling content of less than 10% by weight, preferably less than 8% by weight and, in particular, preferably less than 6% by weight relative to the total mass of the paper and is impregnated with a material that it is suitable to form an aqueous composition, more particularly an aqueous solution or an aqueous suspension. The oil resistance of the filter wrap paper has a KIT level of at least 4, preferably at least 5, according to TAPPI T559 cm-02.
    公开号:BR112013032652B1
    申请号:R112013032652-2
    申请日:2012-07-16
    公开日:2021-03-09
    发明作者:Roland Zitturi；Dietmar Volgger；Dieter Mohring
    申请人:Delfortgroup Ag；
    IPC主号:
    专利说明:

    Field of invention
    [001] The present invention is located in the field of paper production for smoke articles. In particular, it refers to a filter wrap paper for a smoke article, a method for producing the same, and also a smoke article that makes use of such a filter wrap paper. Basics and state of the art
    [002] A commercially available cigarette filter consists of an oval, round or cylindrical tobacco roll, which is wrapped in cigarette paper, one similarly shaped like a filter plug, which is surrounded by wrapping paper filter paper, and also a filter paper, which is usually adhered to the entire filter wrap paper and to a part of the cigarette paper surrounding the tobacco roll and therefore connects the filter plug to the tobacco roll.
    [003] The filter plug itself may consist of different materials, cellulose acetate fibers are generally used, partly in combination with activated carbon particles. The filter involving paper surrounding the filter plug is usually adhered to the surface of the filter plug along one or more narrow band-shaped areas, which usually extend or extend respectively along a direction parallel to the axis of symmetry of the filter buffer. The filter wrap paper is usually also attached to itself along a narrow seam to prevent the filter plug from bursting open. For this purpose, a large number of different adhesives are used in the prior art, although polyvinylacetate or heat-melted adhesives are generally used.
    [004] Typical filter wrap papers in the range of medium air permeability and relatively low permeability are composed of wood pulp, in which a mixture of short or long fibers, depending on the properties of the desired paper, is used. In addition, these papers typically contain mineral fillers, for example, calcium carbonate, kaolinite, talc, titanium dioxide or other mineral fillers and mixtures thereof. In addition or alternatively, other additives can be provided to activate special properties, for example, moisture resistant additives.
    [005] Such filter wrap papers are produced on the paper machine, for example, on Fourdrinier yarn machines.
    [006] The cellulose fibers used for paper production are typically differentiated into long and short fibers, in which the long fibers are typically cellulose fibers obtained from coniferous wood, such as pea or pin, with a length of more than 2 mm, while short fibers are obtained from deciduous wood such as birch, birch or eucalyptus, typically having a length of less than 2 mm, usually about 1 mm.
    [007] In a first stage of paper production, the pulp is suspended in water and then refined in a tapping machine or what is known as a refiner. It is common for long and short fibers to be refined separately. The intensity with which the pulp has been refined is determined by measuring the degree of refining, for example, according to ISO 5267 ("Pulps. Drainability determination - Part 1: Schopper-Riegler method"). The result of this measurement is provided in Schopper-Rieglerdegrees (° SR). Typically, the long fiber pulp for use in filter wrap paper is refined to a degree of 50-70 ° SR.
    [008] Short fiber pulp is, above all, refined considerably less severely and reaches a degree of refining from 15 ° SR to 40 ° SR. The refinement of short fiber pulp can also be omitted altogether.
    [009] After adding fillers, for example, calcium carbonate, kaolinite, talc, titanium dioxide or other mineral fillers or mixtures thereof, the fiber filler suspension flows from the paper machine inbox to the wire and can be dewatered there by various means, for example, by gravity or vacuum. Then, the wet fiber net can be passed through the pressure section, where it is dried by mechanical pressure against a drying felt. Finally, the fiber net can pass through the drying section, where it is dried by contact with cylinders, which, for example, are heated by steam. Subsequently, the finished paper can be rolled up. It is possible to carry out additional processing steps on the paper machine, for example, sizing in a size or film press, the application of watermarks, embossing, impregnation, etc.
    [010] The finished filter wrap paper is then normally present in the form of a spool, with a width corresponding to the width of the paper machine. This spool is then generally cut into narrower coils, or what are known as coils, the width of which results from the circumference of the filter plug and the desired width of the adhesive seam. A typical coil is about 5000 to 6000m long and has a width of 25 to 27 mm. Significant shifts in coil length and width are possible to adapt to the broad spectrum of commercially available cigarette filters. In addition, it is common for a coil width to be about an integer multiple of the width required for the production of a filter plug, provided that filter production machines can readily produce more, typically two, filter rods simultaneously in parallel. .
    [011] In some cigarette filters, one or more capsules are inserted into the filter plug and can be destroyed by mechanical pressure. These capsules contain a fluid, especially an oil with aromatic substances, for example, menthol. Therefore, the smoker has the possibility, by pressing on the filter plug, for example, applied by the fingers, to destroy that capsule / capsules and, in this way, to release aromatic substances. The aromatic substances released then taste the smoke flowing through the filter plug and out of the end of the cigarette's mouth, such that the smoker can perceive the aromatic substances. Thus, the smoker can control the impression of the cigarette's taste by destroying the capsules. Such a cigarette filter is, for example, described in US 2008/142028.
    [012] The liquid leaking from the destroyed capsules has the tendency to penetrate through the filter wrap paper and likewise through the filter paper, therefore, in such a way the spots become visible on the outer surface of the cigarette. These points are noticeable to the smoker and compromise the visual appearance of the cigarette.
    [013] Such points can be avoided if the filter wrap paper forms a certain oil barrier. The ability of a paper to form an oil barrier is hereinafter referred to as “oil resistance” and can be measured by a common test in the paper and paper processing industry according to Tappi T559 cm-02 “Grease resistance test for paper and cardboard ”(Grease Resistance Test for Paper and Paperboard). In this test, drops of 12 liquids assorted from different tests in ascending order according to their wetting skills are applied to the paper and it is then determined which of the liquids penetrate the other sides of the paper. The test result is the so-called KIT Level, which describes for which liquid test the penetration for the other side papers occurred first. Therefore, it is described by a number between 1 and 12, where at the highest values it corresponds to a higher effective oil barrier. In the event that the first liquid test penetrates through the paper, the result is denoted as “<1”. For a filter wrap paper for the application as described above, a KIT Level of about 5 is provided to be sufficient to prevent the formation of dots on the cigarette.
    [014] One possibility to provide the paper with such an oil barrier function or with “oil resistance” is to coat the filter wrap paper with fluorinated hydrocarbons, which provide the paper with oil-repellent properties. Such fluorinated hydrocarbons are commonly used, for example, in food packaging made out of paper, but are not allowed for use in cigarettes in many countries. Additionally, this coating can complicate the adhesion of the filter wrap paper.
    [015] In addition to fluorinated hydrocarbons, they have also been suggested for use, in particular, in modified starch products, in particular, starches substituted with octenyl succinate, for impregnating paper for food packaging, see WO 2008/100688. Therefore, these starches have the disadvantage that in order to activate the desired effect, they have to be applied to the paper in a relatively large amount. A sufficient effect could only be activated with an application of more than about 80 kg of this starch product per ton of paper.
    [016] If the proposed method was applied to a filter wrap paper, this proportion would correspond to an application of typically more than 0.002 kg / m2 (2 g / m2). This would increase not only material costs, but also the energy demand for drying in an unfavorable manner.
    [017] Also in CA 2467601, the application of the starch product to activate oil resistance is described. At this point, it is suggested to use a composition consisting of a modifying starch, an agent for increasing mechanical flexibility, for example, glycol, and an agent for adjusting rheological behavior. Although the mechanical flexibility of the coating can be improved, it is necessary, according to that patent specification, to apply more than 75 kg of this composition per ton of paper in order to ensure sufficient oil resistance. Therefore, material consumption and related costs for material and energy for drying paper are also relatively high here. The effect could also only be demonstrated by papers with a base weight of more than 0.037 kg / m2 (37 g / m2), which corresponds to an application of at least 0.00278 kg / m2 (2.78 g / m2 ). It is by no means obvious that the effect described in the above patent specification can be readily transferred to the filter wrap paper with a significantly lower base weight. In addition, the use of glycols in cigarette papers is not permitted in some countries.
    [018] In the case of filter wrap paper, which is generally substantially lighter and thinner than the packaging of food paper, proportionally higher application amounts of these starch products are required based on the mass of paper, because the papers can only provide less oil resistance due to their low base weights and low thickness and, because, due to the low base weight, the application per unit weight of the filter wrap paper occurs over a relatively larger area.
    [019] In addition to additional costs, the application of larger amounts of starch product also has some additional disadvantages. For example, papers that are coated with starch tend to fail, which increases the number of cleaning cycles in the processing machines and reduces their productivity. Summary of the invention
    [020] The object of the invention is to provide a filter wrap paper, which can be produced at low cost and still has sufficient oil resistance and advantageous mechanical properties for further processing.
    [021] This objective is activated by a filter wrap paper according to claim 1, as well as a method for its production according to claim 11. Advantageous developments are disclosed in the dependent claims.
    [022] The filter wrap paper according to the invention comprises a participation of long fiber pulp of at least 30% by weight, preferably at least 40% by weight, based on the pure fiber mass of the paper. In addition, the filter wrap paper is characterized by the combination of the following three characteristics: (i) The degree of refining of the long fiber pulp is between 80 ° SR and 100 ° SR, preferably between 85 ° SR and 95 ° SR, according to ISO 5267, Schopper-Riegler Method. (ii) The filter wrap paper has a fill content of <10% by weight, preferably <8% by weight and, in particular, preferably <6% by weight, based on the total mass of the paper, and (iii) The filter wrap paper is impregnated with a material that is suitable to form an aqueous composition, in particular an aqueous suspension or solution.
    [023] The inventors have found that, by combining these characteristics, a filter wrap paper can be produced, which has a KIT Level according to Tappi T559 cm-02 of at least 4, typically even 5 or more. This is true even if the filter wrap paper as a starting material, that is, still without impregnation, has a very low base weight of 0.015-0.035 kg / m2 (15-35 g / m2).
    [024] This is, from the inventors' point of view, an unpredictable and surprising result, which is very obviously to be attributed to a synergistic effect between the three characteristics (i) to (iii). Even a combination of two of the above characteristics (i) to (iii) does not provide such a positive effect, as is shown in more detail with reference to comparative examples. The inventors' investigations indicate, in fact, that this special technical effect is activated only by the combination of these three specific characteristics.
    [025] As mentioned above, the filter wrap paper according to the invention allows for sufficient oil resistance with a comparatively low base weight of 0.015 to 0.035 kg / m2 (15 to 35 g / m2), based on the starting material without impregnation. Preferred papers are considered to be those that have a base weight before impregnation of 0.020-0.030 kg / m2 (2030 g / m2), more preferably 0.020-0.025 kg / m2 (20-25 g / m2). Such filter papers may have an average air permeability according to ISO 2965 of less than 12,000 cm7 (cim2 min kPa), preferably less than 8,000 cm3 / (cm2 min kPa). The effect, according to the invention, can also be activated with filter papers with a higher base weight. Therefore, with filter papers above 0.035 kg / m2 (35 g / m2), it is also possible to activate sufficient oil resistance by other conventional methods except in the preferred range here, for which the state of the art does not really provide a satisfactory solution. according to the knowledge of the inventors.
    [026] Due to impregnation and an application of additional optional material as described below, the base weight of the finished filter wrap paper is increased. Preferable ranges for the finished filter wrap paper are between 0.0155-0.024 kg / m2 (15.5-24.0 g / m2), preferably 0.0205-0.039 kg / m2 (20.5-39.0 g / m2), and in particular, preferably 0.0205-0.034 kg / m2 (20.5-34.0 g / m2).
    [027] The appropriate amount of coating material for impregnation can be determined experimentally, such that the desired oil resistance is provided. Preferably, the contribution of the material for impregnation to the base weight of the finished filter papers is 0.0005-0.003 kg / m2 (0.5-3.0 g / m2), preferably 0.001-0.0025 kg / m2 (1, 0-2.5 g / m2) and, in particular, preferably 0.0013-0.002 kg / m2 (1.3-2.0 g / m2).
    [028] As mentioned above, the filter wrap paper of the invention is impregnated with a material that is suitable to form an aqueous composition, particularly an aqueous suspension or solution. This aqueous suspension or solution can then be used during impregnation in order to penetrate the material into the paper, whereas the aqueous part is evaporated or vaporized after impregnation. Favorable materials for impregnation have proven to be starch or a starch derivative, preferably a hydrolyzed starch, particularly maltodextrin.
    [029] Therefore, the invention is not limited to these materials. Instead of these, one or more of the following substances can be used for impregnation: gelatin, shellac, collodion, gum arabic, agar, tragacanth, locust bean gum, guar gum, carboxymethyl starch, alginic acid and salts of them, in particular sodium, potassium and calcium alginates, or a cellulose derivative, in particular methylcellulose or carboxymethylcellulose and the sodium, potassium, calcium or magnesium compounds thereof.
    [030] As described above, a special feature of the filter wrap paper according to the invention is that the amount of fill is selected to be relatively low. However, fillers may be present, albeit in a comparatively lesser amount, these materials are preferably mineral fillers, especially calcium carbonate, kaolinite, talc, titanium dioxide or a mixture of two or more of these fillers.
    [031] Although even by impregnating the paper as described above - in combination with, in particular, the high degrees of refining of the long-fiber pulp and the relatively low filler contents - an increase in oil resistance sufficiently high for most of applications can be activated, the oil resistance can, if necessary, be increased additionally if a layer of additional material is applied, particularly printed or sprayed. This additional layer of material can basically be applied to either side of the filter wrap paper. Preferably, it is applied at least to the side that is in use facing the filter plug. In contrast to impregnation, where the material is introduced into the paper, the optional additional application of material is basically limited to the surface of the paper already impregnated and is therefore denoted as “coating” in the present specification.
    [032] Preferably, the contribution of the additional material layer to the base weight of the filter wrap paper finished in the treated area is 0.001-0.006 kg / m2 (1.0-6.0 g / m2), preferably 0.002-0.004 kg / m2 (2.0-4.0 g / m2). The limitation "in the treated area" here indicates that the entire surface of the filter wrap paper does not necessarily have to be coated with the additional material. This is especially the case in the applications described further below, where the coating of additional material is used primarily to provide a self-adhesive effect.
    [033] The material of the additional material layer is also preferably suitable to form an aqueous composition, in particular an aqueous suspension or solution. Oxidized starch has proved to be particularly advantageous. However, all the materials mentioned above in conjunction with the impregnation can also be considered.
    [034] Preferably, the impregnation material and / or the material of the additional material layer is suitable for adhering the filter wrap paper to itself, a filter plug and / or a filter paper after wetting without any additional adhesive. As explained in greater detail below with reference to the exemplary modalities, the impregnation and optional additional coating serves not only to increase the oil resistance, but to provide the filter wrap paper, as a special additional advantage, with a self-adhesive effect. . For this purpose, the material of the impregnation or additional coating only has to be wetted and, therefore, partially dissolved, on which it can be adhered to another section of the filter wrap paper, the filter plug or a wrapping paper. filter. This self-adhesive effect can also be provided only by the impregnation itself, but, therefore, is enhanced by the coating of additional material. If the impregnation alone is already sufficient to activate the oil resistance, the application of the additional material, that is, the coating, can be limited to such selected areas serving as adhesive areas when the filter wrap paper is adhered to itself, the filter buffer or filter paper.
    [035] In the case of the production method according to the invention of the filter wrap paper, initially a base paper having the above characteristics (i) and (ii) are produced. This base paper is then impregnated with a suitable material in an aqueous composition, in particular an aqueous suspension or solution. Such impregnation can be carried out, for example, in the size press of a paper machine. Alternatively, impregnation can be carried out by applying the aqueous composition bilaterally in a film press of a paper machine or by applying a two-sided roller.
    [036] After impregnation and drying, the filter wrap paper can optionally be coated with an additional material as mentioned before. Rotogravure is preferred as a coating method. Suitable application methods additionally are flexographic printing, spraying or application by a film press or a roller. It is, therefore, characteristic in this case that the material is only applied to the surface and is not introduced into the paper structure, as for example, with impregnation in the size press. Description of preferred exemplary modalities
    [037] It has been found that, by treating special fiber, selecting the appropriate paper composition and impregnating the paper with an aqueous composition, a synergistic effect can be activated, which allows all of the aforementioned requirements to be activated simultaneously together. This would be illustrated by the following examples.
    [038] EXAMPLES 1-8: Insufficient oil resistance of modified and conventional filter wrap paper and realization of oil resistance by the invention.
    [039] Several filter wrap papers with a base weight of about 0.023 kg / m2 (23 g / m2) were produced, comprising about 60% long fiber pulp and about 40% short fiber pulp, with both percentages based on the mass of pure fiber, and a variable fill content of 010%, based on the total mass of the paper. Precipitated calcium carbonate (PCC) was used as a filler.
    [040] In addition to the filling content, the degree of refining of the long fiber pulp was also varied. In table 1, “normal” indicates a long-fiber pulp with a conventional degree of refining from 50 to 70 ° SR, whereas, in the case of variants with highly refined (“intensive”) long-fiber pulp, the pulp of long fiber was refined in a refining disc together to a degree of refining of 93 ° SR. The paper impregnation, if any, was carried out on the paper machine sizing press with a 10-15% aqueous suspension of a short chain hydrolyzed starch, (MaltodexrinEliane MD2 from Avebe, available, for example, via Brenntag CEE GmbH), such that the paper structure after drying contains about 1-2 g of this starch per square meter of paper, which is hereinafter referred to as the “application quantity”, although, strictly speaking, this is not a “Application” in the sense of a coating, but, instead, an impregnation. Unless otherwise stated, all percentages are based on weight%.
    [041] To produce the suspension of starch, 150 kg of that starch product was stirred in about 800 liters of tap water at room temperature with a common stirring device and after 5-15 minutes while stirring the suspension was supplemented with water of tap up to 1000 kg.
    [042] The amount of starch added to the paper by impregnation was determined as the difference in base weight determined according to ISO 536 before and after impregnation.
    [043] All papers were tested for their oil resistance according to Tappi T559 cm-02, in which 9 tests were performed on each paper. The range of values obtained and all other results of these experiments are summarized in Table 1.

    [044] Table 1: Oil resistance of coated, modified and conventional filter wrap paper.
    [045] Example 1 describes conventional filter wrap paper and therefore shows that conventional filter wrap paper does not have sufficient oil resistance.
    [046] In example 2, the long-fiber pulp has been intensively refined, which deals with a denser structure of the paper. However, no improvement in oil resistance could be activated.
    [047] In example 3, no padding was used. This measure also deals with a denser structure of the paper, but in the same way it hardly improves the resistance to oil.
    [048] Example 4 shows that the combination of highly refined long-fiber pulp and the omission of filling also does not activate a sufficient improvement in oil resistance.
    [049] Examples 5-7 show the same papers as in examples 1-3, therefore, with an additional impregnation by the starch suspension. Although the applied amount of starch corresponds to the amount described in WO 2008/100688 or CA 2467601 and thus at least a small improvement in oil resistance may have been expected, this cannot be confirmed experimentally.
    [050] From examples 1-7, it can further be concluded that the low base weight and low thickness of filter wrap paper presents a specific difficulty in the search for oil resistance, and this difficulty cannot be overcome by the state of the art methods in an obvious way.
    [051] The inventors have found that by combining all these measurements, this is what there is to say - by the use of highly refined long-fiber pulp - by reducing the filling content - by impregnation with a suspension of starch, a synergistic effect can be activated, which is not only the result of the simple superimposition of the individual contributions of these measurements. This is because of the measurements for the role of example 8 to show a KIT Level of 5-6, while it was not possible to activate a KIT Level greater than 2 by any of Examples 1-7, in which up to two of the measurements described were of the same applied. Therefore, a KIT Level of 5-6 already represents sufficient oil resistance.
    [052] It would be noted that, in example 8, a KIT Level of 5-6 can be activated already by impregnating with only 1.2 g of starch per square meter of paper, while an impregnation with 1.5 g of starch per meter square of paper in examples 5-7 does not cause considerable improvement.
    [053] EXAMPLES 9-20: Applicability of the invention in the field of typical filter wrap paper.
    [054] The following examples show that the observed synergistic effect is not strongly dependent on the properties of paper, but can be used on the entire range of typical filter wrap paper.

    [055] Table 2: Oil resistance of coated filter wrap papers
    [056] From examples 9-11, it can be seen that an increase in base weight is beneficial for oil resistance and, therefore, with an increase in base weight or a higher KIT Level with the same amount applied during impregnation can activated, or the same KIT Level can be maintained with a lower amount applied during impregnation. The method can be performed with similar results for filter wrap paper, with a basis weight of about 0.015 kg / m2 (15 g / m2) to about 0.035 kg / m2 (35 g / m2). Based on these examples, the base weight will preferably be selected from the range of 0.020 kg / m2 to 0.030 kg / m2 (20 g / m2 to 30 g / m2) and, in particular, preferably from the range of 0.020 kg / m2 at 0.025 kg / m2 (20 g / m2 to 25 g / m2). Here, the base weight denotes the base weight of the filter wrap paper before impregnation, which is hereinafter also referred to as the "starting base weight". The described effect can also be activated by an initial base weight of more than 0.035 kg / m2 (35 g / m2), but for such papers other known methods can also be used to activate oil resistance.
    [057] In examples 12-14, the content of highly refined long-fiber pulp with constant fiber weight is varied. As expected, an increase in oil resistance results from an increase in long-fiber pulp content, since the highly refined long-fiber pulp contributes to a denser structure of the paper. To activate sufficient oil resistance, the long-fiber pulp content, based on the total fiber mass of the paper, would be at least 30%, preferably at least 40%. In principle, at this point there is no reason not to use up to 100% long fiber pulp. Therefore, for very high long-fiber pulp contents, the advantages in oil resistance do not increase in the same way as for low contents. Since long fiber pulp is usually more expensive than short fiber pulp and refining is also associated with energy costs, at this moment there is an ideal content of long fiber pulp for each application, inter alia also due to economic considerations .
    [058] Referring to the refining of the long fiber pulp, an effect is produced from a degree of refining of about 80 ° SR, therefore a range of 85 ° SR to 95 ° SR is preferred. Since the tensile strength of the paper increases with increasingly severe refining, the long-fiber pulp is not to be refined arbitrarily intensively. An upper limit for the degree of refining of the long fiber pulp is fixed at 100 ° SR.
    [059] Finally, in examples 15-17, the filling content (here: precipitated calcium carbonate) in the filter wrap paper is varied. An increase in calcium carbonate content or similar filler opens the paper structure and deteriorates the oil resistance, such that the calcium carbonate content, as can be concluded from example 6, was chosen in any case to be lower than 10%, preferably less than 8%, and, in particular, preferably less than 6%. It is also possible to avoid using fillers entirely. Since, on the one hand, calcium carbonate is more cost-effective than pulp and, on the other hand, with a higher filling content more starch may have to be used in the impregnation, the specific choice of filling content to activate sufficient oil resistance - within the limits defined here - results no less from economic considerations.
    [060] Finally, as shown in examples 10 and 18-20, the amount of starch, which is applied to the paper during impregnation, can be varied. When the applied amount increases, an increase in oil resistance can be seen, in which, as with the long fiber pulp content, the improvement in oil resistance with larger applied amounts does not increase in the same way as for smaller amounts. Adequate applied amounts have been found to be from 0.0005 kg / m2 to 0.003 kg / m2 (0.5 g / m2 to 3 g / m2), preferably between 0.001 kg / m2 to 0.0025 kg / m2 (1 , 0 g / m2 and 2.5 g / m2), in particular, preferably between 0.0013 kg / m2 to 0.002 kg / m2 (1.3 and 2.0 g / m2).
    [061] In addition to impregnation with a suspension of a short chain, hydrolyzed starch, which is shown here in the examples, the invention can also be activated by impregnation with other water-based compositions, such as solutions or suspensions. As an alternative material for short chain hydrolyzed starch, gelatin, shellac, collodion, gum arabic, agar, tragacanth, locust bean gum, and guar gum, for example, in addition, starch and derived from starches, such as carboxymethyl starch or alginic acid and salts thereof, in particular sodium, potassium and calcium alginates as well as cellulose derivatives such as methyl cellulose or carboxymethyl cellulose and the sodium, potassium, calcium or magnesium compounds thereof. Mixtures containing one or more of these substances can also be used. For the specific selection of the substance or mixture of substances, legal requirements would additionally be considered beyond processability.
    [062] Since the possibility of increasing oil resistance by impregnating with increasing amounts of starch is technically limited, it is suggested in a further embodiment of the invention to additionally apply an additional aqueous composition to the surface of the paper after impregnation. The aqueous composition can contain a starch or a starch derivative, which can be the same as used for impregnation. In many cases, therefore, a different substance or mixture of substances will be chosen, which are best applicable in the selected application method, for example, due to the demands placed on rheological behavior.
    [063] A comparable effect can, for example, be activated with gelatin, shellac, collodion, gum arabic, agar, tragacanth, locust bean gum, and guar gum and, furthermore, with starch and derived from starches such as carboxymethyl starch, or with alginic acid and salts thereof, in particular sodium, potassium, and calcium alginates as well as with cellulose derivatives such as methylcellulose or carboxymethylcellulose and the sodium, potassium, calcium or magnesium compounds thereof.
    [064] Regarding the type of application method, there are no limitations. Conventional printing methods such as rotogravure or flexo printing can be used, but spraying the composition is also possible, as is unilateral application by a film press or a roller. It is characteristic, therefore, that the material is applied only to the surface and is not introduced into the structure of the paper, as is the case with impregnation in a size press, for example. By conceptual distinction from the aforementioned "impregnation", this application of material provided in addition to the impregnation is denoted as "coating". This term is to be understood in an external sense and would only express that the additional material is for the most part applied to the paper already impregnated instead of being penetrated into the structure of the paper.
    [065] In the following examples, some of the papers already impregnated from examples 9-20 were additionally printed (ie "coated") on the entire surface with an aqueous composition of approximately 20%, more particularly an aqueous suspension of an oxidized starch, (Perfectamyl A5760 from Avebe) in a conventional gravure method. Here, additionally 3 g of oxidized starch was applied per square meter of printed area of the paper.

    [066] Table 3: Oil resistance of impregnated printed filter wrap papers
    [067] From examples 21-24 it can be seen that, by printing, an additional increase in oil resistance by 2-3 levels can be activated, in general, where the oil resistance measurement was taken on the side printed. When applied to the cigarette, it is then recommended, but not absolutely necessary, that the printed side be turned towards the filter plug.
    [068] The amount of solid matter in the aqueous composition, applied by rotogravure in addition to the aforementioned impregnation, provides relevant effects in the range of 0.001-0.006 kg / m2 (1.0-6.0 g / m2) of printed area therefore, the range of 0.002-0.004 kg / m2 (2.0-4.0 g / m2) of printed area is preferred. The applied amounts established are based on the drying of paper, that is to say once the water of the applied aqueous composition has evaporated or vaporized. Also for other application methods it is to be expected that with an applied amount of 0.001-0.006 kg / m2 (1.06.0 g / m2), preferably 0.002-0.004 kg / m2 (2.0-4.0 g / m2) m2), at least one effect approximately comparable with the gravure method can be activated, as long as the oil resistance obviously depends more on the applied amount than on the application method.
    [069] Example 25: Adhesion of the filter wrap paper Impregnation alone as well as in combination with the additional application to the surface (“coating”) makes it possible to obtain a filter wrap paper that can be adhered to the filter pad itself or to the filter, without the use of additional adhesives. Instead, it is sufficient to first apply a small amount of water to part of the surface or the entire surface of the paper. There are no special requirements for water, it can preferably be ordinary tap water, although deionized water is also possible. The water temperature is likewise of no particular relevance for adherence and is preferably in the range of 15 ° C to 60 ° C.
    [070] Subsequently, the area wetted with water has to be brought into contact under light mechanical pressure with the area to which it can adhere and has to be dried for a short time, preferably at an elevated temperature, for example, at about 60 ° C. Temperatures here are those that allow rapid drying, preferably above 40 ° C, especially preferably above 50 ° C. Therefore, the temperature would not be chosen to be so high that it deals with a thermal decomposition of the paper, for which reason it would in any case be below 105 ° C, preferably below 90 ° C.
    [071] Of particular importance during the production of cigarette filters is that the adhesion reaches a certain minimum resistance very quickly in such a way that the filter does not burst in the additional processing steps or the filter wrap paper separate from the filter. Adhesion is carried out in such a way that the adhesive seam has a width of about 2 mm and is oriented in the machine direction of the filter wrap paper. In the position where the filter wrap paper is attached to itself, the adhesion is between the upper side and the side wire of the filter wrap paper.
    [072] To mimic this process in the laboratory, each of the papers in examples 10, 11, 14 and 22 was tested for these adhesive properties. In addition to the paper from example 10 and its printed variant from example 22, in which both approximately represent medium filter wrap paper, the papers from examples 11 and 14 were also selected because they have greater tensile strength due to higher base weight and higher long-fiber pulp content.
    [073] For the test, two paper strips were prepared first, which have a width of 15 mm in the machine direction and a length in the transverse direction sufficient for a tensile strength measured according to ISO 1924-2. On the upper side of the first strip, water was applied with a brush along a straight line, about 2 mm wide oriented in the machine direction, this is what there is to say in parallel to the short side of the strip. Subsequently, the paper strip was brought into contact with the side wire of the second strip in such a way, from the adhesion of the two strips, a resulting strip with a width of 15 mm, but now of a greater length. The splice was manually put under pressure for about 1 second using a flat metal body, which was heated to a temperature of around 60 ° C. Immediately thereafter, the adhered paper strip was provided by a tensile strength measured in accordance with ISO 1924-2. Here, the paper strip is attached at both ends and stretched until it tears. In these experiments, it was observed whether the tear occurred in the seam or to a different position on the paper strip. Four bands were tested by paper.
    [074] It was found that, apart from the role of example 11, three or more of the four bands tested did not tear over the splice position. Therefore, the bond strength is already at that point in time greater than the tensile strength of the paper itself, for which reason it can be assumed that the bond strength of the adhesives is high enough for machine processing. For example, 11, this was not the case because the paper tore up only once in four experiments not being in the seam position. Therefore, because of the greater tensile strength of this paper, it can be assumed that in this case also the adhesive strength is sufficiently high for the machine to produce filters from that paper.
    [075] If a sufficient oil resistance of the paper can already be activated by impregnating the paper, but the adhesive strength is not sufficient for machine processing, it is suggested that the composition intended for application to the surface, or to the “coating ”, Is not applied over the entire surface, but only in partial areas. These partial areas can have any shape, but they will be based on the shape of the area they can join. Preferably, these partial areas will be designed correspondingly with the areas of the filter wrap paper provided with adhesive in conventional filter production.
    [076] The composition is typically and preferably applied in sub-areas next to the paper facing the filter plug. Therefore, it is also conceivable for these sub-areas to be provided on the other sides of the paper or on both sides of the paper, for example, if an additional adhesion of the filter wrap paper to the filter paper is to be activated in a final step. of the cigarette production process.
    [077] The characteristics mentioned above can be of significance in any arbitrary combination.
    权利要求:
    Claims (15)
    [0001]
    1. Filter wrap paper for a smoking article, said filter wrap paper having a long fiber pulp content of at least 30% by weight, preferably at least 40% by weight, based on the pure fiber mass of the paper, characterized by the fact that - the degree of refining of the long fiber pulp, according to ISO 5267, Schopper-Riegler method is between 80 ° SR and 100 ° SR, preferably between 85 ° SR and 95 ° SR, - the filter wrap paper has a filling content of less than 10% by weight, preferably less than 8% by weight and, in particular, preferably less than 6% by weight, based on the total mass of the paper, - the wrapping paper filter is impregnated with a material that is suitable to form an aqueous composition, particularly an aqueous suspension or solution, and - the oil resistance of the filter wrap paper has a KIT level according to Tappi T559 cm-02 of at least 4, preferably at least 5.
    [0002]
    2. Filter wrap paper according to claim 1, characterized by the fact that it has, without impregnation, a base weight of 0.015-0.035 kg / m2 (15-35 g / m2), preferably 0.020-0.030 kg / m2 (20-30 g / m2) and, in particular, preferably 0.020-0.025 kg / m2 (20-25 g / m2) and / or the finished filter wrap paper has a base weight of 0.01550, 044 kg / m2 (15.5-44.0 g / m2), preferably 0.0205-0.039 kg / m2 (20.5-39.0 g / m2) and, in particular, preferably 0.0205-0.034 kg / m2 (20.5-34.0 g / m2).
    [0003]
    3. Filter wrap paper according to claim 1 or 2, characterized in that the contribution of the impregnating material to the base weight of the finished filter paper is 0.0005-0.003 kg / m2 (0.5 -3.0 g / m2), preferably 0.001-0.0025 kg / m2 (1.0-2.5 g / m2) and, in particular, preferably 0.0013-0.002 kg / m2 (1.3-2 , 0 g / m2).
    [0004]
    4. Filter wrap paper according to any one of the preceding claims, characterized in that the impregnation material comprises starch or a starch derivative, preferably a hydrolyzed starch, and in particular, preferably maltodextrin, or in which the The impregnation material comprises one or more of the following substances: gelatin, shellac, collodion, gum arabic, agar, tragacanth, locust bean gum, guar gum, carboxymethyl starch, alginic acid and salts thereof, in particular sodium, potassium and calcium alginates, or a cellulose derivative, in particular methylcellulose or carboxymethylcellulose and the compounds of sodium, potassium, cassium or magnesium thereof.
    [0005]
    Filter wrap paper according to any one of the preceding claims, characterized in that the length of the main fiber of the unrefined long-fiber pulp is 2 mm or more.
    [0006]
    6. Filter wrap paper according to any one of the preceding claims, characterized by the fact that the padding is at least partially formed by a mineral padding, in particular, calcium carbonate, kaolinite, talc, titanium dioxide or a mixture of two or more of these fillers.
    [0007]
    7. Filter wrap paper according to any one of the preceding claims, characterized by the fact that on which a layer of additional material is applied, in particular, printed or sprayed, on which the layer of additional material is preferably applied at least on one side that in use faces the filter plug.
    [0008]
    8. Filter wrap paper according to claim 7, characterized by the fact that the contribution of the additional material layer to the base weight of the filter wrap paper finished in the treated area is 0.0010.006 kg / m2 (1.0-6.0 g / m2), preferably 0.002-0.004 kg / m2 (2.0-4.0 g / m2).
    [0009]
    Filter wrap paper according to claim 7 or 8, characterized in that the material of the additional material layer is suitable to form an aqueous composition, in particular an aqueous suspension or solution, in which the material is preferably oxidized starch or comprises one or more of the materials of claim 4.
    [0010]
    10. Filter wrap paper according to any one of the preceding claims, characterized in that the impregnation material and / or the layer material of the additional material is suitable, after being wetted, to adhere the wrap paper filter itself, a filter plug and / or filter paper, without an additional adhesive.
    [0011]
    11. Method for producing a filter wrap paper, characterized by the fact that said method comprises the following steps: - Refining a long fiber pulp to a degree of refining according to ISO 5267, Schopper-Riegler Method, between 80 ° SR and 100 ° SR, preferably between 85 ° SR and 95 ° SR, - Produce a base paper, - which has a refined long-fiber pulp content of at least 30% by weight, preferably at least 40% by weight based on the mass of pure fiber, and - which has a fill content of <10% by weight, preferably <8% by weight and, in particular, preferably <6% by weight, based on the total mass of the base paper, and - Impregnate the base paper with an aqueous composition, in particular an aqueous suspension or solution.
    [0012]
    12. Method according to claim 11, characterized by the fact that the impregnation is carried out in a size press of a paper machine, in a film press of a paper machine or by the application of a two-sided roller.
    [0013]
    13. Method according to claim 11 or 12, characterized in that, after impregnation, a layer of additional material is applied over at least a section of the filter wrap paper in the form of an aqueous composition, preferably by rotogravure, in which the additional material layer is preferably applied to the selected areas, which can serve as adhesive points, if the filter wrap paper is adhered to itself, a filter plug or a filter paper, in which the aqueous composition for impregnation and / or aqueous composition for the application of the additional material preferably has a solid content of 5-20% by weight, preferably 10-15% by weight.
    [0014]
    14. Method according to any of claims 11 to 13, characterized in that the base paper has a base weight of 0.015-0.035 kg / m2 (15-35 g / m2), preferably 0.020-0.030 kg / m2 (20-30 g / m2) and, in particular, preferably 0.020-0.025 kg / m2 (20-25 g / m2) and / or where the impregnation material comprises one or more of the substances mentioned in claim 4, and / or wherein the aqueous composition for applying the additional material comprises, as a solid content, oxidized starch or one or more of the materials of claim 4.
    [0015]
    15. Smoke article with a filter plug, characterized by the fact that it is surrounded by a filter wrap paper as defined in any one of claims 1 to 10, wherein the filter plug contains one or more capsules, the which can be destroyed by mechanical pressure and is / are filled with a liquid containing aromatic substances.
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    同族专利:
    公开号 | 公开日
    US20150059996A1|2015-03-05|
    PL2551407T3|2013-11-29|
    KR20140051910A|2014-05-02|
    JP2014525995A|2014-10-02|
    MY159314A|2016-12-30|
    US8939155B2|2015-01-27|
    CN103717803A|2014-04-09|
    EP2551407A1|2013-01-30|
    BR112013032652A2|2017-01-24|
    CN103717803B|2015-10-14|
    US9115471B2|2015-08-25|
    US20140137880A1|2014-05-22|
    ES2421621T3|2013-09-04|
    WO2013013786A1|2013-01-31|
    EP2551407B1|2013-06-19|
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-09-29| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application according art. 36 industrial patent law|
    2021-02-09| B09A| Decision: intention to grant|
    2021-03-09| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/07/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11175809.0|2011-07-28|
    EP11175809.0A|EP2551407B1|2011-07-28|2011-07-28|Oil-resistant filter wrapping paper|
    PCT/EP2012/002985|WO2013013786A1|2011-07-28|2012-07-16|Oil-resistant filter wrapper paper|
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