JP2019108155A - Lid material - Google Patents

Abstract

To provide a lid material that can be easily peeled off while achieving high sealing performance.SOLUTION: In a lid material 10 on which a surface substrate 11, an intermediate substrate 15, and a heat adhesive resin layer 17 are laminated, the surface substrate 11 and the intermediate substrate 15 are bonded by an adhesive layer 14, a peeling layer 13 is partially formed adjacent to the surface substrate 11 between the surface substrate 11 and the intermediate substrate 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lid for sealing the mouth of a container.

  Conventionally, a lid material for sealing a container opening for sealing a container opening containing highly hygroscopic contents such as coffee has been used (see Patent Document 1).

Japanese Utility Model No. 4-25323

  A conventional lid member as shown in Patent Document 1 includes a heat-resistant layer and a heat-weldable layer, and heat sealing is performed to seal the opening of the container. Such a lid material is difficult to be peeled off as the sealing property is high. Therefore, there is a problem that it becomes difficult to peel off easily at the time of opening as the sealing performance is pursued.

  Then, this invention makes it a subject to provide the lid material which can be easily exfoliated simultaneously with realizing high sealing performance.

In order to solve the above problems, the present invention is
Surface substrate,
Intermediate base material,
A lid material on which a heat adhesive resin layer is laminated,
The surface substrate and the intermediate substrate are adhered by an adhesive layer,
There is provided a lid member characterized in that a release layer is partially formed on the surface base material in an overlapping manner between the surface base material and the intermediate base material.

  Further, in the lid of the present invention, in the straight line in which the release layer extends from the center of the lid toward the outer edge of the lid, the distance between the outer edge and the inner edge of the release layer passes through the center of the lid. 1/10 or more and 1/2 or less of the length of the line segment connecting between the outer edges of.

  Moreover, the lid material of the present invention is characterized in that the release layer is a release varnish layer.

  According to the present invention, it is possible to provide a lid member that can be easily peeled while achieving high sealing performance.

It is a sectional view of a lid concerning one embodiment of the present invention. It is a top view of a lid concerning one embodiment of the present invention. It is a sectional side view which shows typically the mode of opening of the container using the cover material which concerns on one Embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a lid according to an embodiment of the present invention. FIG. 2 is a plan view of a lid according to an embodiment of the present invention. The lid 10 according to the present embodiment is, as shown in FIG. 1, from the upper surface side, the surface base 11, print layer 12, release layer 13, adhesive layer 14, intermediate substrate 15, adhesive layer 16, heat adhesion. The resin layer 17 is laminated and comprised. In the present embodiment, since the mouth of the container body is closed from above, the surface base material 11 is described as the top layer and the heat-adhesive resin layer 17 is described as the bottom layer. In the case of closing the lower side from below, the surface base material 11 is the lowermost layer, and the heat adhesive resin layer 17 is the uppermost layer. Therefore, the upper and lower layers are for convenience of the description of the embodiment, and do not affect the technical scope of the invention. In addition, since FIG. 1 is for demonstrating layer structure, the ratio of the thickness of layers, and the ratio of the thickness of each layer and the length of the surface direction of a lid material differ from an actual thing.

  As the surface substrate 11, a paper such as coated paper, high-quality paper, kraft paper or the like, or a stretched film made of a resin such as polypropylene, polyamide or polyester can be used. Alternatively, a film obtained by vapor-depositing an inorganic oxide such as aluminum oxide or silicon oxide on these films, or a film obtained by coating or co-extrusion of a barrier resin such as polyvinyl alcohol or vinylidene chloride on these films can be used. In this case, since the vapor-deposited layer of the inorganic oxide and the barrier resin layer have barrier properties, the surface substrate 11 also has barrier properties. Although the surface substrate 11 is expressed as “surface” in the sense that it is a substrate located on the surface side of the intermediate substrate 15 described later, a layer for protecting the surface substrate 11 is additionally provided on the upper layer side. It may be formed in It is preferable that the thickness of the surface base material 11 is 6 micrometers or more and 50 micrometers or less.

  The print layer 12 is provided to display the contents of the product, impart an aesthetic feeling, or display a portion for pulling the surface substrate 11. The printing layer 12 is formed of printing ink containing a binder and a pigment. The printing layer 12 may be omitted rather than a required layer.

  As the peeling layer 13, a single substance or a mixture of a nitrocellulose resin, a polyamide resin, an acrylic resin, a rubber resin, a polyester resin, a polyurethane resin, a vinyl chloride-vinyl acetate copolymer resin, etc. can be used. . It may be a composition in which a silicone resin is added to a single substance or a mixture of the above resins. The release layer 13 can be formed by printing or coating in a solid state. Although the coating amount and coating thickness for forming a peeling layer are not specifically limited, Preferably, coating thickness is 0.1-10 micrometers. As shown in FIG. 1, the release layer 13 is partially formed over the print layer 12, not on the entire surface of the print layer 12. Although not directly through the print layer 12, the release layer 13 is partially formed over the surface substrate 11. When the print layer 12 is omitted, the release layer 13 is formed directly on the surface substrate 11 partially.

  The adhesive layers 14 and 16 can be formed by a dry lamination method using an adhesive or a melt extrusion method using a thermoplastic resin. Examples of the adhesive for dry lamination include polyvinyl acetate adhesives, homopolymers such as ethyl, butyl and 2-ethylhexyl esters of acrylic acid, or coweights of these with methyl methacrylate, acrylonitrile, styrene and the like. An ethylene copolymer based adhesive composed of a copolymer of polyacrylic acid ester based adhesive, cyanoacrylate based adhesive, ethylene and a monomer such as vinyl acetate, ethyl acrylate, acrylic acid, methacrylic acid, etc. Cellulose adhesives, polyester adhesives, polyamide adhesives, polyimide adhesives, amino resin adhesives consisting of urea resin or melamine resin, phenol resin adhesives, epoxy adhesives, polyurethane adhesives Use adhesives such as reactive (meth) acrylic adhesives Can. It laminates by the dry laminating method using these adhesives.

  As a thermoplastic resin for melt extrusion, polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid Examples thereof include thermoplastic resins such as ester copolymers, ionomers and polypropylene, and these resins are used for lamination by a melt extrusion method.

  The intermediate base 15 is preferably a heat-resistant base that can withstand the heat when heat sealing is performed. As the intermediate substrate 15, a film obtained by depositing an inorganic oxide such as aluminum oxide or silicon oxide on a stretched film made of a resin such as aluminum foil or polypropylene, polyamide or polyester, or a barrier such as polyvinyl alcohol or vinylidene chloride Films coated or co-extruded with a polymeric resin can be used. Also, films of polyvinyl alcohol, polyvinylidene chloride, ethylene / vinyl alcohol copolymer and the like can be used. When both the surface base material 11 and the intermediate base material 15 have barrier properties, higher barrier properties can be exhibited. The thickness of the intermediate base 15 is preferably 6 μm or more and 50 μm or less.

  As the heat-adhesive resin layer 17, either a general heat-adhesive resin or a heat-adhesive resin called an easy peel type having a particularly easy peelability may be used. As a general heat adhesive resin layer, a hot melt type heat adhesive resin containing an ethylene-vinyl acetate copolymer as a main component is used. As a general heat adhesive resin, low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α-olefin copolymer, ethylene-propylene copolymer, Thermal adhesive resin such as ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid ester copolymer These may be used as films or they may be laminated by melt extrusion.

  As an easy peel type heat adhesive resin having high peelability, an easy peeling mechanism changes the mixing ratio of, for example, vinyl acetate of ethylene-vinyl acetate copolymer resin, and the mouth of the container main body and the heat adhesive resin layer Interfacial peeling type peeling at the interface, film co-extruded with two or three layers of the support layer and the thermal adhesive layer, lowers the adhesive strength of the support layer and the thermal adhesive layer, and the mouth and heat of the container body Delamination type in which the support layer of the heat adhesive resin layer and the heat adhesive layer are peeled off at the time of bonding and opening, and cohesive peeling type in which random polypropylene, polyethylene, polystyrene, etc. are mixed at a predetermined ratio Although roughly divided into three mechanisms, any type can be used. Furthermore, a hot melt type can also be used for the easily peelable heat-adhesive resin layer. The thickness of the heat-adhesive resin layer 17 is preferably 15 μm or more and 50 μm or less.

  The adhesive layer 14 and the adhesive layer 16 may be formed by either the dry lamination method using an adhesive or the melt extrusion method using a thermoplastic resin as described above, but the adhesion is heat adhesion. It needs to be stronger than the adhesive force of the resin layer 17 to the opening of the container body. This is to allow the entire lid 10 to be easily peeled off from the mouth of the container body.

  FIG. 2 is a plan view of a lid according to an embodiment of the present invention. FIG. 2 corresponds to the line A-A in FIG. In FIG. 2, 13 a indicates the position of the inner edge of the release layer 13. FIG. 2 is a view as seen from the surface base material 11 side which is the uppermost layer, and since the release layer 13 is the lower layer side of the printing layer 12, the release layer 13 can not be visually recognized. Therefore, in FIG. 2, the position of the inner edge 13 a of the release layer 13 is indicated by a broken line. The outer edge of the release layer 13 is the same as the outer edge of the lid 10 and is an arc-shaped portion. That is, in the present embodiment, the peeling layer 13 is solidly applied and formed in a region surrounded by a convex arc on the right side in FIG. 2 and a straight line extending in the vertical direction in FIG.

  D shown in FIG. 2 is the distance between the outer edge of the peeling layer 13 and the inner edge 13a on a straight line extending from the center O of the lid 10, which is circular, toward the outer edge of the lid 10. The distance D is preferably 3 mm or more and 20 mm or less, and more preferably 5 mm or more and 15 mm or less. If the distance D is too small, it will be difficult to put a finger between the surface substrate 11 (or the printing layer 12) and the adhesive layer 14. Moreover, when the distance D is too large, the part which surface substrate 11 (or printing layer 12) leaves | separates from the lower layer side is large, is not stabilized, and appearance is not good. In the present embodiment, the distance D is 10 mm. Further, the distance D is 1/10 or more and 1/2 or less of the length of the line connecting the outer edges of the lid 10 through the center of the lid 10 (the diameter of the circle when the lid is circular) Is preferred. If the ratio of the distance D to the lid 10 is too small, the pulling force is not transmitted to the entire lid 10 and it becomes difficult to peel off from the mouth of the container body. In addition, when the ratio of the distance D to the lid 10 is too large, the surface base 11 side is likely to be peeled off from the adhesive layer 14, and it becomes difficult to peel off the entire lid 10 from the mouth of the container body.

  The lid 10 as shown in FIGS. 1 and 2 is placed so as to close the opening of the mouth of the container body after filling the contents into the container body, and the lid 10 is placed from the surface substrate 11 side. By heating, the heat-adhesive resin layer 17 is heat-sealed, and is adhered to the opening of the container main body to complete the product. The lid according to the present invention is applicable to various aspects of containers and contents. For example, it is possible to apply as a lid material of tube type containers, such as a resin container and glass bottle for seasonings, a glass bottle for milk, a resin container and glass bottles for coffee, a sauce, and mayonnaise.

  FIG. 3 is a side cross-sectional view schematically showing how the container using the lid according to the present embodiment is opened. The container body 20 shown in FIG. 3 is a glass bottle in which coffee powder is sealed. In FIG. 3, for convenience of explanation, the ratio of the thickness of the container main body 20, the thickness of the lid 10, etc. to the size of the bottle, the length in the surface direction of the lid, etc. is exaggerated unlike the actual one. Moreover, in FIG. 3, the printing layer 12 and the contact bonding layer 16 are abbreviate | omitted and shown for convenience of explanation. The contents are also omitted in FIG.

  FIG. 3A shows a state in which the lid member 10 is thermally bonded to the opening 21 of the container body 20 to seal the container. At the time of sale, the product is distributed as a product in a state in which the cap is screwed so as to cover the mouth 21 of the container body 20. In the state of FIG. 3A, such a cap is removed. From the state shown in FIG. 3A, the nail is held in the outer edge portion of the peeling layer 13 and the peeling layer 13 and the surface substrate 11 are peeled. Then, the vicinity of the outer edge of the surface substrate 11 can be pinched with a fingertip. Taking this part as a hook, the surface substrate 11 is picked and pulled upward so as to be separated from the opening 21 of the container body 20. The state at this time is shown in FIG. Furthermore, even if the surface substrate 11 is pulled, the other portions of the surface substrate 11 are firmly adhered to the intermediate substrate 15 by the adhesive layer 14, so the surface substrate 11 peels off from the intermediate substrate 15. do not do. Then, when the surface base material 11 is pulled by further applying a force, as shown in FIG. 3C, the heat adhesive resin layer 17 is peeled from the opening 21 of the container body 20, and the container is unsealed.

  By providing the peeling layer 13 on the lower layer side of the surface substrate 11, as described above, it is possible to make a cut for picking. Therefore, it is not necessary to separately provide a projection like the knob in the shape of the lid 10. Therefore, when the lid material is punched out of the laminated material, it becomes difficult to cause a problem and efficient manufacture of the lid material becomes possible.

Example 1
The printing layer was formed on a polyethylene terephthalate (PET) film having a thickness of 12 μm. Thereafter, a release varnish was applied to the surface of the print layer by a gravure coating method in a range where the distance D was 10 mm, to form a release layer. Subsequently, a 7 μm thick aluminum (AL) foil was attached by a dry lamination method through the adhesive layer to the surface of the print layer and the release layer. Next, the aluminum foil and a linear low density polyethylene (LLDPE) film with a thickness of 20 μm are bonded by a dry lamination method through an adhesive layer to obtain PET / printed layer / release layer / adhesive layer / AL / adhesive layer / LLDPE formed the lamination material laminated in order. A cured product of an acrylic polyol and an isocyanate compound was used as an adhesive for forming the two adhesive layers. As a peeling varnish for forming a peeling layer, "weak lamination No. 415 (A) Kai" manufactured by DIC Graphics was used. Next, a lid member as shown in FIGS. 1 and 2 was obtained by punching into a disc having a diameter of 70 mm.

(Example 2)
PET / printed layer / peeling layer / adhesive layer / AL / adhesive layer / in the same manner as in Example 1 except that a 30 μm thick easy peel (EP) film of cohesive peeling type was used as the heat adhesive resin. A lid was formed by sequentially stacking EPs.

(Comparative example 1)
The procedure of Example 1 was repeated except that the distance D was 40 mm, and the release layer was formed, and PET / printed layer / release layer / adhesive layer / AL / adhesive layer / LLDPE were sequentially laminated. The formed lid was formed.

(Comparative example 2)
A lid was formed in the same manner as in Example 1 except that the release layer was not formed, in which PET / printed layer / adhesive layer / AL / adhesive layer / LLDPE were sequentially laminated.

  A glass bottle having an outer diameter of 70 mm at its mouth is prepared as the container body, and the lids of the above Examples and Comparative Examples are placed in such a manner that the heat-adhesive resin layer is in contact with the mouth of the container body. The lid was placed so as to close the opening, and the lid was heated from the side of the surface substrate to thermally fuse the heat-adhesive resin layer, thereby bonding the lid to the mouth of the container body.

(Evaluation)
In the lid of Examples 1 and 2, the peeling layer and the printed layer can be easily formed by sandwiching the nail in the outer edge portion of the peeling layer according to the position displayed on the surface of the lid in a state of being adhered to the container opening. It peeled off. The heat adhesive resin layer was favorably peeled from the container opening by putting the fingertip in a range of 10 mm corresponding to the peeled distance D and picking up the peeled portion and the peeled portion of the surface substrate.

  When the cover of Comparative Example 1 was adhered to the mouth of the container, the peeling layer and the printed layer were easily peeled off by sandwiching the nail on the outer edge portion of the release layer according to the position displayed on the surface of the lid . When the fingertip is put in the range of 40 mm corresponding to the peeled distance D, and the peeled portion and the peeled portion of the surface substrate are picked and pulled, the surface substrate and the aluminum foil are peeled and the lower layer side of the aluminum foil is the container opening It remained in the

  The lid of Comparative Example 2 could not be partially peeled off from the surface substrate, and therefore could not be plucked for picking, making it difficult to separate the lid from the container opening.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, in the above-described embodiment, the planar shape of the lid member is circular, but it may be various shapes other than circular, such as oval and polygonal. Even in this case, the distance D between the outer edge and the inner edge of the release layer on a straight line extending from the center of the lid toward the outer edge of the lid is at least 1/10 of the distance between the outer edges passing the center of the lid It is preferable that it is 1/2 or less. For example, the center of gravity can be used as the center of the lid in the case of a shape other than a circle.

DESCRIPTION OF SYMBOLS 10 ... Lid material 11 ... Surface base material 12 ... Printed layer 13 ... Peeling layer 14 ... Adhesive layer 15 ... Intermediate base material 16 ... Adhesive layer 17 ... Thermal bonding Resin layer 20 ... container body 21 ... mouth

Claims (3)

Surface substrate,
Intermediate base material,
A lid material on which a heat adhesive resin layer is laminated,
The surface substrate and the intermediate substrate are adhered by an adhesive layer,
A covering material characterized in that a peeling layer is partially formed on the surface base material in a layer between the surface base material and the intermediate base material.   The release layer is a straight line extending from the center of the lid toward the outer edge of the lid, and the distance between the outer edge and the inner edge of the release layer is the length of a line connecting the outer edges of the lid through the center of the lid. The lid according to claim 1, wherein the lid is 1/10 or more and 1/2 or less.   The lid according to claim 1, wherein the release layer is formed by a release varnish.

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