• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a water-soluble, unbleached sack paper consisting of lignin-containing cellulosic fibers as a main component and one or more excipients, at least one surfactant is included as an excipient and the sack paper has a relative wet strength after a watering time of 5 minutes. of less than 6%. Furthermore, a paper bag is described consisting of water-soluble, unbleached sack paper.
    公开号:AT514558A4
    申请号:T706/2013
    申请日:2013-09-11
    公开日:2015-02-15
    发明作者:Walter Dr Rüf；Regina Dipl Ing Krasser
    申请人:Mondi Ag；
    IPC主号:
    专利说明:

    The present invention relates to a water-soluble, unbleached sack paper consisting of lignin-containing cellulosic fibers as a main component and one or more excipients and a paper sack consisting of water-soluble, unbleached sack paper.
    Sack paper for the production of paper bags for a wide variety of ingredients usually has high demands on the mechanical tensile properties of the paper in both the machine and transverse directions, to prevent unintentional paper tearing, whether in filling, stacking, storage or transport and also, in addition to the good tensile properties have a high porosity and sufficient extensibility both in the longitudinal and transverse directions. Porosity is important, for example, to avoid pressure build-up inside the bag during filling of the bag, which is usually done by rapid machine insertion, thus avoiding tearing of the bag due to a " pressure wave " and also to ensure that the dust load on filling is powdery Materials such as cement or the like. Is kept as low as possible.
    Such a sack paper has been known for some time and is produced in the most varied qualities for a very wide variety of purposes. In addition to the abovementioned properties of the sack paper, sack paper exists both in a bleached and unbleached form, with bleached sack paper having a significantly lower lignin content compared to unbleached sack paper, such as sack papers for recycling, in particular dissolving in water or water with additives Makes application of shear forces well suited. Unbleached sack papers which have a high percentage of lignin are due to the fact that lignin is a naturally occurring hydrophobing agent, usually not or hardly soluble in water and therefore represent in particular a relatively large problem in the disposal of the same. Disposal or Recycling by dissolving such papers is currently not possible due to the low dissolution characteristics, and incorporation of such bags into, for example, waste incineration is fraught with problems in that, for example, in the case of cement sacks, remaining amounts of raw material or filler in the sacks in the sacks Over time, they cause a build-up of cement or lime or the like in incinerators, which in turn may cause a problem of removal of important elements of the furnaces.
    In contrast, water-soluble papers do not show such problems and can be disposed of accordingly. Water-soluble papers, in particular sack papers, are characterized by a complete dissolubility of the paper after the treatment according to the standard ISO 5263 "Pulps - Laboratory wet disintegration". and the rate of penetration of water into the paper, which is defined by a K value, > 5000 is determined. The K value is measured here by means of an Emco Penetration Tester DPM 27. The measurement of the K value is carried out at room temperature of 25 ° C ± 2 ° C with pure cold water (Trinkwas¬serqualität), which has a temperature between 15 ° C and 20 ° C and contains no additives.
    The present invention now aims to provide a water-soluble, unbleached sack paper which is completely soluble in water both according to ISO 5263 and moreover has a penetration speed of water comparable to that of bleached sack paper in the paper without the cellulose fibers prior to their use Bleaching process must be subjected.
    To solve this problem, the inventive water-soluble, unfolded sack paper is characterized essentially by the fact that at least one surfactant is present as an auxiliary and that the sack paper has a relative wet strength after a washing time of 5 min. of less than 6%. Upon addition of a surfactant, it is possible to reduce the surface tension of the sack paper so produced to compensate for the effect of lignin as a water repellent to render the paper water-soluble to within a few minutes, preferably about 5 minutes. The addition of the surfactant further does not affect the overall strength of the paper, so that the properties of the sack paper are comparable to those of a non-water-soluble, unbleached sack paper, without the need for a complicated work-up procedure the cellulose fibers for the removal of lignin, namely a bleaching process must be carried out, whereby a particularly economically produced Pa¬pier can be provided.
    By giving the sack paper a relative wet strength after a watering time of 5 min. of less than 6%, it is possible to dissolve the sack paper almost completely within a short time, so that such a sack paper, for example, without residue, together with building materials contained therein, such as e.g. Cement can be introduced into a concrete mixer, for example, and subjected to a mixing process, whereby completely residue-free processing of such bagging paper becomes possible, without e.g. the concrete produced therewith has deteriorated properties.
    Merely for comparison, it is stated that known, likewise substantially water-soluble papers, such as, for example, toilet paper, which is produced from fresh fibers, have a wet strength after a washing time of 5 min. of about 8%, from which it follows that the paper according to the present invention is particularly rapidly and completely dissolvable.
    According to one embodiment of the invention, the sack paper is designed so that between 0.1% and 2% surfactant are included. In this case, the amount of surfactant is chosen in particular such that, on the one hand, the surface tension is not lowered too much in order to maintain unrestricted and instantaneous water absorption of the paper. Too rapid and too full water absorbency of paper has the disadvantage that, for example, such a wrapping paper would not be printable, which is especially for paper in industrial use or sacks in industrial use nachtei¬lig, since, for. in the building materials industry, the contents of the bag are usually imprinted directly on top of them. Now, if the water uptake is too high, such papers are too hydrophilic for the flexo print commonly used for printing on sack paper, and either the paper will not be printable at all or the print will bleed, making such paper undesirable for industrial use ,
    According to one embodiment of the invention, the auxiliary material of the sack paper is chosen so that the at least one surfactant from the group nonionic, anionic, cationic or amphoteric surfactants, fatty alcohols, fatty alcohol, fatty alcohol, fatty alcohol, methyl ether, fatty alcohol ethoxylates or phenol nolethoxylate represents. Which type of surfactant is chosen for the specific application has proved to be of little criticality and has to be determined in accordance with the lignin content of the cellulose fibers used, the wood species from which the cellulose fibers originate, the surface tension of the sack paper and the like ¬ Choose, so that in principle any of the group of ionic or nonionic, anionic, cationic or amphoteric surfactants but also the fatty alcohols, fatty alcohol polyglycolether, fatty alcohol sulfates, fatty alcohol ether sulfates, methyl ether sulfates, fatty alcohol ethoxylates or phenol ethoxylates can be selected.
    According to one embodiment of the invention, the sack paper is designed so that it has an absorbency corresponding to a K value of greater than 5000.
    The K value here is a measure of the penetration rate of water in Pa¬pier and thus for the absorbency of the paper. It is usually measured by means of ultrasound transmission. In such a measurement, the ultrasonic transmitter and the ultrasonic receiver are arranged in a measuring cell in such a way that the paper sample to be tested is irradiated directly by the sound wave. In a measurement, an ultrasonic wave with a constant frequency and intensity is generated at the transmitter. Due to the interaction of the paper sample with the surrounding medium, namely water, the ultrasound intensity at the receiver changes and this is displayed in a transmission-time diagram. The determined K value then indicates which slope the curve has at the time of the greatest penetration speed. The measuring method used here is the measuring method according to the Emco Penetration Tester DPM 27.
    To increase the strength of the sack paper can be proceeded according to the invention so that further contains a dry strength agent. Dry strength agents used according to the present invention are starches such as cationic potato starch, corn starch, tapioca starch. The addition of dry strength agents improves the printability of the paper.
    According to one embodiment of the invention unbleached softwood fibers are used as the cellulose fibers for a water-soluble, unge¬bleached sack paper according to the invention. Furthermore, softwood fibers usually have an increased fiber length in comparison with hardwood-derived cellulosic fibers, so that by hooking the fibers, among other things, a higher strength of the sack paper can only be achieved by using special fibers, without the addition of a dry-strength agent being required or only extremely small amounts of a dry strength agent must be used.
    According to a development of the invention, the cellulose fibers are selected from softwood fibers of softwoods, in particular fibers of spruce wood and / or pine wood.
    To set the desired strength, as is the case with a further development of the invention, the procedure is such that the softwood fibers are used as high-consistency-milled (HC-milled) and / or low-consistency milled (LC-milled) softwood fibers. Depending on the grinding used, the fiber length of the pulp used is more or less increased, thereby influencing the strength of the paper thus produced. According to the present invention, both exclusively high consistency milled and exclusively low-consistency milled softwood fibers or mixtures thereof may be used.
    To achieve a stable and especially in the dry state sufficiently strong sack paper, the invention is further developed to the effect that a longitudinal / transverse ratio of the tensile strength between 1 and 1.8, in particular 1.3. Sack papers are printed on a so-called " clupack attachment " with which it is possible to produce Pa¬piere having almost the same tensile properties in both longitudinal and transverse direction. The more uniform the tensile properties in the longitudinal and transverse directions, the more stable and suitable is such a manufactured paper for practical use, in which, for example, in such a bag up to 50 kg of cement or more will be filled and which sack may or may not break during or after filling. With a water-soluble, unbleached sack paper according to the invention, it is possible to achieve a longitudinal / transverse ratio between 1 and 1.8, in particular 1.3.
    In order in particular to achieve a good longitudinal / transverse ratio and to produce sack paper which has excellent strength properties or simultaneous water solubility, according to the present invention the procedure is such that the cellulose fibers are contained as dried, in particular flake-dried, pulp.
    The present invention also relates to a paper sack made from the water-soluble, unbleached sack papers according to the invention. Such a sack is essentially characterized in that the sack paper is glued to an adhesive, in particular a maltodextrin adhesive. Maltodextrins, as well as the paper itself, are water-soluble so that it is possible to obtain a filled one
    Sack according to the invention directly, for example, in a concrete mixer ge¬ together with the cement or mortar contained therein can be introduced without residue or only leaving statistically finely divided Zellulose¬ fibers in the building material to be produced.
    To achieve greater strength and especially for bags with heavy content or particularly large-sized bags of paper sack according to the invention is further developed such that it consists of multilayer bag paper. For the purpose of providing barrier properties, the paper sack may be further formed by additionally applying a layer of water-soluble polymer, such as polyvinyl alcohol or polyether, to at least one paper layer.
    The invention will be explained in more detail below with reference to exemplary embodiments.
    example 1
    From a water-soluble, unbleached sack paper according to the invention, sample sacks are produced and filled with cement. The cement-filled sacks are sealed and placed directly in a concrete mixer for 5 min. or 10 min. subjected to the usual cement mixing process, whereupon the result is checked.
    Inserted sack paper; unbleached, water-soluble sack kraft paper with a basis weight according to ISO 536 of 70 g / m2.
    The cellulose fibers used in the sack paper are long fibers made of wood which has been subjected to an oxidation treatment. The paper does not contain a paralyzing agent containing 0.3% by weight of polyalkylene glycol ether (fatty alcohol alkoxylate) having an MW of 588 g / mol as a nonionic surfactant. The tensile strength of the paper in the machine direction was 5.7 kN / m 2 in accordance with ISO 1924-3 and 4.2 kN / m 2 in the machine direction direction, which corresponded to a tensile index of 1.36. From this base paper, 3 different cement sacks were produced, wherein the gluing of the sacks took place by means of a maltodextrin adhesive. The first cement bag consisted of two layers of the above-defined, unbleached Kraftpa¬ pier of the invention without intermediate layer, the second cement bag had a lageaus unbleached kraft paper according to the invention and a second layer of unbleached kraft paper, which had a coating of polyvinyl alcohol. The
    Coating was 30 pm thick. The third cement bag prepared consisted of a first layer of unbleached, unsized, water-soluble kraft paper according to the invention, an exposed PVA layer of 38 μm thickness, and a second layer of unsized unbleached kraft paper according to the invention. All paper layers in all three cement sacks had a basis weight of 70 g / m 2.
    The bags were left in the concrete mixer after 5 minutes with respect to unresolved pieces of paper. Mixing time or 10 min. Mischzeit examined, which has been found in Sack 1 that at the end of 5 min. only very small pieces of paper are visible on a sieve, which also after 10 min. hardly diminished.
    With sack 2, after 5 min. still a plurality of small pieces of paper are seen, which after 10 min. are significantly less.
    At Sack 3 is after 5 min. still a large number of small pieces of paper visible, even after 10 min. many pieces of paper are still visible.
    It is thus to be noted that a paper sack, which is produced from unsized, unfused sack paper according to the invention and which paper sack has no additional coating, within 5 minutes. can be almost completely dissolved. The paper sacks 1 to 3 were subsequently filled with cement and subjected to a plurality of handling operations, such as rapid filling, closing, stacking, transporting, i. Shaking, dropping and the like, as a result of which it has been found that paper bag 2 can withstand being dropped from 1 meter height. Paper bag 1 was stable in all handling operations, but when dropped, it plummeted from 1 meter height. The height of the paper bag 1 was stopped by being dropped from the height. The properties of the paper bag 3 were comparable to those of the paper bag 1.
    权利要求:
    Claims (14)
    [1]
    1. Water-soluble, unbleached sack paper consisting of lignin-containing cellulose fibers as the main constituent and one or more excipients, characterized in that at least one surfactant is present as adjuvant and that the sack paper has a relative wet strength after a wetting time of 5 minute from below 6%.
    [2]
    2. sack paper according to claim 1, characterized in that between 0.1% and 2% surfactant are included.
    [3]
    3. sack paper according to claim 1 or 2, characterized in that the at least one surfactant from the group nonionic, anionic, cationic or amphoteric surfactants, fatty alcohols, fatty alcohol, fatty alcohol, fatty alcohol, methyl ether, fatty alcohol or phenol ethoxylates ge is selected.
    [4]
    4. sack paper according to claim 1, 2 or 3, characterized in that it has a Absorbency corresponding to a K value of more than 5000.
    [5]
    A sack paper according to any one of claims 1 to 4, characterized in that it additionally contains a dry strength agent.
    [6]
    A sack paper according to any one of claims 1 to 5, characterized in that the dry strength agent is selected from starch such as cationic potato starch, corn starch, tapioca starch.
    [7]
    A sack paper according to any one of claims 1 to 6, characterized in that the cellulose fibers are used as oxidatively treated unbleached softwood fibers.
    [8]
    8. sack paper according to claim 7, characterized in that the Zellulosefa¬sern be selected from softwood fibers of coniferous wood, in particular fibers of spruce wood and / or pine wood.
    [9]
    9. sack paper according to one of claims 1 to 8, characterized in that the softwood fibers are used as high consistency-ground (HC-milled) and / or low-consistency milled (LC-milled) softwood fibers.
    [10]
    10. sack paper according to one of claims 1 to 9, characterized in that a longitudinal / transverse ratio of the tensile strength between 1% and 1.8%, in particular about 1.3%.
    [11]
    11. sack paper according to one of claims 1 to 10, characterized in that the cellulose fibers are contained as dried, in particular flake-dried pulp.
    [12]
    12. paper bag consisting of water-soluble, unbleached sack paper according to one of claims 1 to 11, characterized in that the sack paper is glued to a glue, in particular maltodextrin glue.
    [13]
    13. Paper bag according to claim 12, characterized in that it consists of mehrla¬gigem bag paper.
    [14]
    14. Paper bag according to claim 12 or 13, characterized in that in principle a layer of water-soluble polymers such as PVA or PE is applied to at least one paper layer.
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    同族专利:
    公开号 | 公开日
    WO2015035434A1|2015-03-19|
    AT514558B1|2015-02-15|
    US20160348319A1|2016-12-01|
    EP3044369B1|2017-06-28|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5272191A|1991-08-21|1993-12-21|Fmc Corporation|Cold water soluble films and film forming compositions|
    US5302248A|1992-08-28|1994-04-12|The United States Of America As Represented By The Secretary Of Agriculture|Delignification of wood pulp by vanadium-substituted polyoxometalates|
    DE19814373C2|1998-03-31|2000-05-31|Aig Allg Immobilienverwaltungs|Biodegradable material for packaging, processes and use|
    DE102010026241A1|2010-06-28|2011-12-29|Mondi Ag|Sack with a designed for dissolution in a humid environment bag wall and use of the bag as a cement bag|EP3088606A1|2015-04-29|2016-11-02|BillerudKorsnäs AB|Disintegratable brown sack paper|
    DE202015102691U1|2015-05-26|2015-07-08|Papiersackfabrik Tenax Gmbh & Co. Kg|Valve bag with double check|
    RU182597U1|2017-02-06|2018-08-23|Сергей Андреевич Комков|DISPOSABLE CONTAINER FOR THE COLLECTION AND DISPOSAL OF PET ANIMALS|
    EP3385445B1|2017-04-06|2019-06-05|BillerudKorsnäs AB|Production of highly stretchable paper having satisfactory surface properties|
    CN112118943A|2018-06-18|2020-12-22|电化株式会社|Method for feeding hardening accelerator for concrete surface finishing|
    EP3795745A1|2019-09-20|2021-03-24|Mondi AG|Craft paper and paper bag made therefrom|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA706/2013A|AT514558B1|2013-09-11|2013-09-11|Water-soluble, unbleached sack paper and paper sack|ATA706/2013A| AT514558B1|2013-09-11|2013-09-11|Water-soluble, unbleached sack paper and paper sack|
    EP14781041.0A| EP3044369B1|2013-09-11|2014-08-13|Water-soluble unbleached bag paper, and paper bag|
    PCT/AT2014/000155| WO2015035434A1|2013-09-11|2014-08-13|Water-soluble unbleached bag paper, and paper bag|
    US15/021,445| US20160348319A1|2013-09-11|2014-08-13|Water-soluble unbleached bag paper, and paper bag|
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