• 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:
    A compostable lid for sealing a capsule containing coffee in particular, consisting of a multilayer complex comprising successively: a nonwoven whose fibers consist of at least 50% by weight of polylactic acid (PLA); an adhesive layer suitable for food contact; - a support consisting of a genuine parchment paper.
    公开号:FR3050725A1
    申请号:FR1653909
    申请日:2016-04-29
    公开日:2017-11-03
    发明作者:Valerio Miozzo；Herve Planchard；Florence Vidal；Mireille Roux
    申请人:Ahlstrom Corp；
    IPC主号:
    专利说明:

    COMPOSTABLE OPERATOR FOR CAPTURING CAPSULE AND CAPSULE OBSTRUCTED BY THE OPERCULE
    FIELD OF THE INVENTION The invention relates to a lid for sealing a capsule, particularly of coffee. The invention also relates to a capsule closed by said lid. Finally, it relates to the use of this operculum for sealing a capsule containing a foodstuff, in particular ground coffee.
    In the remainder of the description, the invention is described in relation to coffee capsules. However, it finds an application for all areas for which the seal is likely to contain food substances and must be resistant to water, pressure, tear and advantageously heat sealable on a capsule or other food container.
    PRIOR STATE OF THE TECHNIQUE
    Two types of coffee pods are currently available on the market namely: - soft pods also called "pods" consisting essentially of a non-woven bag including coffee, - rigid pods or capsules consisting of capsule itself closed by means of a lid. The invention relates specifically to capsules.
    The Nespresso®-type capsules are widely known on the European market, and the capsule part itself and the lid are essentially made of aluminum. There are also capsules whose lid is made of plastic.
    There is, however, a strong demand to turn these non-compostable capsules into compostable capsules.
    Few solutions have been proposed concerning the capsule part itself. Thus, capsules made of plastics based on polylactic acid (PLA) or plastics known as "PLA compatible" have been developed. The so-called "compatible PLA" materials correspond to a mixture of PLA and vegetable fibers. They are biodegradable and compostable. Thus, these capsules fulfill the compostability requirements imposed by the EN 13432 standard.
    However, today, no satisfactory solution has been proposed to combine with these capsules, also compostable lids.
    This is not surprising, however, as the constraints related to the cover or operculum are numerous. Indeed, these capsules are likely to be used in coffee machines at pressure and temperature values to which they must be mechanically resistant.
    For the most part, the implementation of the capsules in a coffee machine is done according to the following process. The bottom of the capsule, once the capsule set up in its location is hit. The orifices formed allow the introduction of the water heated to a temperature of 96 ° C. in the body of the capsule at a pressure of between 10 and 12 bars. The water filling the capsule gradually exerts pressure on the cap which comes into contact with piercing elements arranged in the machine, of the spike type. Once the lid has been punctured, the coffee flows into the cup. Manufacturers impose a number of conditions in terms of coffee flow. In particular, the powder should not end up in the cup. In addition, a pod of about 30 ml should flow in about 30 seconds. In addition, the liquid during flow must have a color and density similar to that of the foam. There are also a number of constraints once the coffee is poured even though the capsule has not yet been ejected. Indeed, in the event that the user ejects the capsule a few hours after the coffee has flowed, that is to say once the temperature of the capsule returned to room temperature, do not that the capsule is deformed. Otherwise, it does not fall into the receptacle provided for this purpose when introducing a new capsule. The operculum must not be delaminated either.
    In other words, it is necessary to have a compostable lid, which is resistant to moisture and pressure so as not to tear before or at the time of drilling. It is also necessary to provide a lid that does not let the powder pass when the coffee flows.
    FR 2 991 230 A1 discloses a multilayer complex combining a nonwoven based on biodegradable polymers, a layer of adhesive suitable for food contact and a support based on cellulosic fibers, for the manufacture of molds. This document describes in particular the advantage of using this type of complex in wet conditions specific to the implementation of these molds. Naturally, no pressure condition is mentioned since it is not a parameter to be considered for this application.
    The problem to be solved by the invention is therefore that of developing a compostable lid for sealing a capsule, in particular a capsule containing coffee that satisfies the conditions of use of this type of lid in the coffee machines, in particular the resistance to moisture, the pressure, the absence of delamination, the filter properties prohibiting the passage of coffee into the cup at the time of percolation.
    Another problem that the invention proposes to solve is also that of developing a cap that can be integrated into the present capsule production lines without substantially modifying said chains.
    SUMMARY OF THE INVENTION
    To do this, the Applicant has developed a complex combining a non-woven based on PLA fibers, an adhesive layer and a real greaseproof paper support. The operculum thus obtained is resistant to pressure, moisture and easily integrated into existing capsule production lines. In addition, the PLA layer prevents the passage of the powder through the lid at the time of the flow of coffee in the cup.
    More specifically, the subject of the invention is a compostable lid intended to close off a capsule containing coffee in particular, consisting of a multilayer complex successively comprising: a nonwoven whose fibers consist of at least 50% of fibers; polylactic acid, an adhesive layer suitable for food contact under the conditions of use of the lid, a support consisting of a genuine parchment paper.
    According to a first feature, the lid of the invention contains a nonwoven, whose fibers are made up of at least 50%, of polylactic acid fibers. Polylactic acid (PLA) has the advantage of being particularly biobased, biodegradable, and compostable. By "PLA" is meant polylactic acid, its derivatives (type L and D or copolymers), and mixtures thereof.
    In general, a nonwoven is a material obtained by randomly arranging individual fibers that are interlaced. The cohesion of the fibers between them can be ensured by the addition of adhesive or binders (latex, polyvinyl alcohol, starch, etc.), by heating, by pressure, or by switching, for example. Many processes for the preparation of nonwovens are part of the knowledge of those skilled in the art. They include, for example, meltblowing, spunbond spinning, carding, jet spinning, spinning, meltblowing and spinning processes. air ("air laying"), or water jet dispersal ("water laying").
    In addition to the PLA fibers, the nonwoven may also comprise additives, mineral fillers, but also fibers of at least one biobased polymer, which may be biodegradable. It may especially be cellulose fibers. Incorporation of additives, fillers, or fibers other than PLA can be used to modulate the melting point of the PLA-based layer.
    In practice, the nonwoven comprises at least 85%, more preferably at least 90% by weight of fibers.
    In an advantageous embodiment, the cohesion of the fibers and therefore of the nonwoven is obtained in the absence of adhesive or binder by a process of manufacture by melt ("spunbond").
    Under these conditions, the nonwoven comprises 100% by weight of fibers, of which at least 50% by weight, advantageously 100% by weight consist of PLA fibers.
    The nonwoven may be monolayer. Advantageously, it may be a non-woven bilayer. The bilayer may be monocomponent that is to say contain only one type of PLA or two-component, that is to say contain 2 types of PLA having different melting points.
    Finally and in practice, the grammage of the nonwoven is between 5 and 100 g / m 2, advantageously between 10 and 30 g / m 2, even more advantageously between 15 and 20 g / m 2, preferably of the order of 18 g / m2.
    According to another characteristic, the lid contains an adhesive layer suitable for food contact, particularly under the conditions of use of the lid. The adhesive suitable for food contact makes it possible, in particular, to ensure the cohesion of the multilayer complex when the latter is exposed to a temperature close to or greater than that of melting the PLA during the heat-sealing of the lid on the capsule. The adhesive also makes it possible to maintain the true grease-proof support on the layer of PLA welded to the capsule when the multilayer complex is in contact with hot water during the percolation, and then during cooling.
    By the term "adhesive suitable for food contact" is meant any type of adhesive generally used in the food industry. However, advantageously, it may be chosen from the group comprising acrylic adhesives, polyurethane adhesives, ethylene vinyl acetate, and mixtures thereof.
    In a preferred embodiment, the adhesive suitable for food contact is chosen from the acrylic adhesives marketed by Lubrizol in the Carbobond® and Hycar® ranges, alone or as a mixture.
    The amount of adhesive is in practice between 1 and 5 gW in dry, advantageously between 2 and 4 g / m 2 in dry, preferably of the order of 3 g / m 2 in dry relative to the surface of the multilayer complex .
    Advantageously, the adhesive layer contains a mixture of acrylic latex cited, at a rate of about 1 gW in sec each.
    According to another characteristic, the support consists of a genuine parchment paper. Genuine parchment paper is a paper treated mostly with sulfuric acid. More rarely, zinc chloride can be used. Fibers are cellulose fibers generally selected from eucalyptus fibers and softwood fibers. In practice, sulfuric acid dissolves the cellulose around the fibers. A cellulose gel is formed which is then precipitated. In a last step, the support is rinsed.
    The support is therefore not a high density greaseproof paper nor a greaseproof paper chemically treated (for example by a fluororesin). The carrier also does not contain any resin providing wet strength.
    In practice, the grammage of the genuine parchment paper is between 50 and 100 g / m 2, advantageously between 60 and 80 g, preferably of the order of 70 g / m 2. The thickness of the multilayer complex which is the subject of the invention is advantageously between 90 and 11 micrometers, whereas the nonwoven based on PLA fibers generally has a thickness of between 20 and 30 microns.
    According to a particular embodiment, the compostable lid of the invention consists of a multilayer complex comprising successively: a non-woven fabric whose fibers consist of 100% by weight of polylactic acid (PLA), the basis weight of which is between 15 and 20 g / m 2; an adhesive layer made of acrylic polymer suitable for food contact, applied at a rate of 2 to 4 g / m 2 in the dry state; - A support consisting of a genuine parchment paper, whose grammage is between 60 and 80 g / m ^.
    The present invention also relates to the process for preparing the cap described above. This process comprises the following steps: - coating of a real parchment paper support with an adhesive suitable for food contact; - Application, a nonwoven whose fibers are constituted by at least 50% by weight of polylactic acid fibers (PLA), on the support advantageously by association by passing through a press; drying of the multilayer complex thus obtained, advantageously with hot air or by contact with heated rolls. The invention also relates to a coffee capsule in particular, comprising a capsule itself containing ground coffee closed with the lid as described above, the lid being positioned so that the nonwoven is next to the border of the capsule.
    In a preferred embodiment, the capsule itself is made of PLA or a compatible PLA material. This has the advantage of being able to secure the lid on the capsule by heat sealing to the extent that the materials are compatible (PLA or PLA compatible). The invention also relates to the use of the cap previously described for the closure of a capsule, in particular a coffee capsule, the cap being positioned so that the nonwoven is facing the edge of the cap. the capsule.
    The process for producing this capsule comprises the following steps: a strip of a multilayer complex is formed, successively comprising: a nonwoven whose fibers consist of at least 50% by weight of polylactic acid fibers; (PLA); O an adhesive layer suitable for food contact; O a support consisting of a genuine parchment paper, - in parallel, the cells formed in a tray are filled by means of individual capsules containing coffee in particular. - The tape is superimposed on the plate, so that the nonwoven is opposite the tray, - the strip is cut to the right of each of the capsules to form lids, - the lids are heat-sealed on the capsules. The invention and the advantages thereof will be more apparent from the figure and the following example given to illustrate the invention and not in a limiting manner.
    DESCRIPTION OF THE FIGURES
    Figure 1 illustrates the lid object of the present invention.
    EXAMPLES OF CARRYING OUT THE INVENTION
    FIG. 1 shows a lid in the form of a multilayer complex successively comprising: a support (1) made of genuine parchment paper; a layer of adhesive suitable for food contact (2); a nonwoven fabric (3) comprising 100% by weight of fibers made of PLA.
    The support (1) is a genuine parchment paper marketed by the applicant under the name "Sulpack". The grammage is 70 g / m 2.
    The adhesive layer is a mixture of about 750 g acrylic latex selected from the Carbobond and Hycar range of about 1 g / m² each.
    The nonwoven is a bilayer formed exclusively of PLA fibers suitable for the fiber faille It is a monocomponent bilayer. The lid is then heat-sealed on a capsule filled with ground coffee and consisting essentially of compostable polymers compatible with PLA. The capsule thus obtained generates a flow of coffee within the time required by the manufacturers, all accompanied by a foam of equivalent quality to the current capsules. The capsule thus manufactured meets the compostability standard EN 13432.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    Compostable gate for sealing a capsule containing coffee in particular, consisting of a multilayer complex successively comprising: a nonwoven (3) whose fibers consist of at least 50% by weight of acid fibers; polylactic (PLA); an adhesive layer (2) suitable for food contact; - a support (1) consisting of a genuine parchment paper.
    [2" id="c-fr-0002]
    2. Seal according to claim 1, characterized in that the nonwoven fabric (3) comprises 100% by weight of fibers, of which at least 50% by weight are made of PLA fibers.
    [3" id="c-fr-0003]
    3. Opercule according to claim 2, characterized in that the nonwoven fibers (3) consist exclusively of polylactic acid (PLA).
    [4" id="c-fr-0004]
    4. Operacle according to one of the preceding claims, characterized in that the grammage of the nonwoven fabric (3) is between 5 and 100 g / m 2, advantageously between 10 and 30 g / m 2, even more advantageously between 15 and 20 g / m 2, preferably of the order of 18 g / m 2.
    [5" id="c-fr-0005]
    5. Opercule according to one of the preceding claims, characterized in that the nonwoven (3) is bilayer.
    [6" id="c-fr-0006]
    6. Seal according to one of the preceding claims, characterized in that the adhesive (2) is im acrylic adhesive.
    [7" id="c-fr-0007]
    7. Operacle according to one of the preceding claims, characterized in that the adhesive (2) is of the order of 3 g / m 2 dry relative to the surface of the multilayer complex.
    [8" id="c-fr-0008]
    8. Operacle according to one of the preceding claims, characterized in that the grammage of the genuine parchment paper is between 50 and 100 g / m 2, preferably between 60 and 80 gW, preferably of the order of 70 g / m ^.
    [9" id="c-fr-0009]
    9. Coffee capsule including a capsule itself, closed with the lid according to one of claims 1 to 8, the lid being positioned so that the nonwoven (3) is opposite the border of the capsule.
    [10" id="c-fr-0010]
    10. Capsule according to claim 9, characterized in that the capsule itself is PLA or a PLA compatible material.
    [11" id="c-fr-0011]
    11. Use of the lid according to one of claims 1 to 8 for closing a capsule, the lid being positioned so that the nonwoven (3) is opposite the edge of the capsule .
    [12" id="c-fr-0012]
    12. Use of the cap according to one of claims 1 to 8, for sealing a coffee capsule, the lid being positioned so that the nonwoven (3) is next to the border of the capsule.
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    法律状态:
    2017-04-25| PLFP| Fee payment|Year of fee payment: 2 |
    2017-11-03| PLSC| Publication of the preliminary search report|Effective date: 20171103 |
    2018-05-02| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-20| PLFP| Fee payment|Year of fee payment: 5 |
    2021-03-24| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1653909|2016-04-29|
    FR1653909A|FR3050725B1|2016-04-29|2016-04-29|COMPOSTABLE OPERATOR FOR CAPTURING CAPSULE AND CAPSULE OBSTRUCTED BY THE OPERCULE|FR1653909A| FR3050725B1|2016-04-29|2016-04-29|COMPOSTABLE OPERATOR FOR CAPTURING CAPSULE AND CAPSULE OBSTRUCTED BY THE OPERCULE|
    EP17724845.7A| EP3448781A1|2016-04-29|2017-04-28|Compostable lid intended to seal a capsule and a capsule sealed by the lid|
    BR112018071853-0A| BR112018071853A2|2016-04-29|2017-04-28|cap that can be composted to seal a capsule and a capsule sealed by the cap|
    AU2017256864A| AU2017256864A1|2016-04-29|2017-04-28|Compostable lid intended to seal a capsule and a capsule sealed by the lid|
    CN201780025222.0A| CN109071103A|2016-04-29|2017-04-28|Compostability lid for seal capsule and the capsule by the lid sealing|
    PCT/FI2017/050329| WO2017187024A1|2016-04-29|2017-04-28|Compostable lid intended to seal a capsule and a capsule sealed by the lid|
    CA3021988A| CA3021988A1|2016-04-29|2017-04-28|Compostable lid intended to seal a capsule and a capsule sealed by the lid|
    JP2018556424A| JP2019517959A|2016-04-29|2017-04-28|Compostable lid for sealing a capsule and the capsule sealed with the lid|
    US16/096,866| US20200216256A1|2016-04-29|2017-04-28|Compostable lid intended to seal a capsule and a capsule sealed by the lid|
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