JP2014125263A - Lid material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lid material which allows formation of a half-cut-off with high accuracy in the inside surface of the lid material, has stabilized laminate strength between a first substrate, e.g. paper, and an easily peelable resin layer and is easy to produce.SOLUTION: A lid material for sealing an opening of a container includes a first substrate, a nitrocellulose or polyurethane type medium layer, an easily peelable resin layer and a second substrate, in order from the outside surface to the inside surface of the lid material. The easily peelable resin layer is peelable in the boundary surface between second substrate and itself. A half-cut-off is formed from the inside surface with a depth almost reaching the boundary surface, and/or a second half-cut-off is formed from the outside surface of the lid material with a depth almost reaching the boundary surface.

Description

  The present invention relates to a lid for sealing an opening of a container.

  Conventionally, a lid material composed of a plurality of layers, which can peel off at least one layer of the lid material before separating the lid material from the container to form an opening in the remaining layer of the lid material It has been known. Openings formed in the remaining layers are formed, for example, by engraving half-cuts on the inner surface of the lid and pass through the contents of the container (eg, liquid, solid, gas, gel, etc.) Or other articles such as straws can be used to insert the remaining layers through the opening of the container.

  More specifically, a lid having paper, a first polyethylene terephthalate (PET) sheet, an easily peelable resin layer, a second PET sheet, an aluminum foil and a sealant layer in order from the outer surface to the inner surface of the lid. Have been proposed (Patent Document 1). In the lid material described in Patent Document 1, either the first PET sheet or the second PET sheet has a rough surface, and the adhesion with the easily peelable resin layer is enhanced. The peeling surface of the lid material is an interface between the PET sheet that does not have a rough surface and the easily peelable resin layer.

  Moreover, the cover material which has paper, a polyethylene layer, a PET sheet, an aluminum foil, and a sealant layer in order toward the inner surface from the outer surface of the cover material is also proposed (Patent Document 2). The peeling surface of the lid material described in Patent Document 2 is an interface between the polyethylene layer and the PET sheet.

  In addition, a cover material having paper, a sealing varnish layer, a release varnish layer, an adhesive resin layer, a metal foil, and a sealant layer in order from the outer surface to the inner surface of the cover material has been proposed (Patent Document 3). In the lid material described in Patent Document 3, the peeling varnish layer peels off a part of the outer surface of the lid material and exposes the opening formed in the inner surface of the lid material. And partially formed between the sealing varnish layer and the adhesive resin layer. Moreover, the peeling surface of the lid material described in Patent Document 3 is an interface between the sealing varnish layer and the peeling varnish layer.

International Publication No. 2012/073274 JP 2012-148805 A JP 2000-219278 A

  However, since the lid material described in Patent Document 1 has two PET sheets per lid material, it is less cost-effective than a lid material having one PET sheet per lid material. In addition, the lid material described in Patent Document 1 is a process of printing a pattern such as a pattern on the surface of the paper layer and laminating the paper layer and the PET sheet with a dry laminating adhesive to form a peeling surface of the lid material. Cost efficiency is also low in that it requires two processes called processes.

  Further, in the lid material described in Patent Document 2, when polyethylene is extruded and laminated on paper, the laminate strength between the paper and the polyethylene layer becomes unstable, and a half cut is engraved on the inner surface or outer surface of the lid material. There is a problem that the accuracy to be performed becomes unstable.

  Further, in the lid material described in Patent Document 3, in order to peel a part of the outer surface of the lid material and expose the opening on the inner surface of the lid material, a peeling varnish is partially formed along the outline of the opening. Therefore, there is still room for studying the registration when a half cut is engraved from the inner surface in order to form a hole in the inner surface.

  Therefore, the present invention is highly accurate in forming a half cut on the inner surface of the lid material, the laminate strength between the first base material such as paper and the easily peelable resin layer is stabilized, and easy to manufacture. An object is to provide a simple lid.

  The present inventors adopt a configuration including a first base material, a nitrocellulose or polyurethane-based medium layer, an easily peelable resin layer, and a second base material in order from the outer surface of the cover material toward the inner surface of the cover material. Thus, the present invention was completed.

That is, the present invention is as follows.
[1] A lid for sealing the opening of the container,
The lid member, in order from the outer surface of the lid member toward the inner surface of the lid member, includes a first substrate, a nitrocellulose or polyurethane-based medium layer, an easily peelable resin layer, and a second substrate,
The easily peelable resin layer is peelable at the interface with the second substrate,
The first half-cut is formed with a depth that substantially reaches the interface from the inner surface, and / or the second half-cut is formed with a depth that substantially reaches the interface from the outer surface,
A lid for sealing the opening of the container.

  [2] The lid member according to [1], wherein an inner surface side of the medium layer is roughened.

  [3] The lid according to [1] or [2], wherein the medium layer is formed of nitrocellulose, a mixture of nitrocellulose and polyamide, or a mixture of nitrocellulose and alkyd resin.

  [4] The lid material according to any one of [1] to [3], wherein the easily peelable resin layer is formed of a mixture of polyethylene and a cyclic olefin copolymer.

  [5] The lid member according to any one of [1] to [4], wherein the outer surface side of the second base material is roughened.

[6] A medium application step of applying a nitrocellulose or polyurethane-based medium to the first substrate to obtain a first member;
A providing step of providing a second substrate;
An easily peelable resin is applied between the application portion of the medium of the first member and the second base material, and the first member and the second base material are laminated to form a laminate. And a first half-cut is formed at a depth that substantially reaches the application part of the easily peelable resin from the inner surface side of the laminate, and / or the easily peelable material from the outer surface side of the laminate. A method for producing a lid for sealing an opening of a container, comprising a half-cut forming step of forming a second half-cut at a depth substantially reaching a resin application portion.

  [7] The method according to [6], wherein the medium applying step is performed by printing the medium on the first base material.

  [8] The method according to [6] or [7], further including a step of roughening the inner surface side of the first member.

  [9] The method according to any one of [6] to [8], further including a step of roughening an outer surface side of the second base material.

  [10] The lamination step is performed by extrusion laminating the easily peelable resin between the application portion of the medium of the first member and the second base material. The method according to any one of 9].

  According to the present invention, since there is no resin sheet such as a PET sheet between the first base material and the easily peelable resin layer, the cost efficiency can be improved as compared with the lid member having the PET sheet at this position.

  In addition, according to the present invention, a printing pattern is formed on at least one surface of the first base material, and at the same time, nitrocellulose or polyurethane-based medium is printed on the other surface, thereby simplifying the lid manufacturing process. Can be

  Moreover, according to this invention, the lamination strength of a nitrocellulose or a polyurethane-type medium layer and an easily peelable resin layer can be maintained.

  In addition, according to the present invention, the first substrate is printed with nitrocellulose or polyurethane-based medium to harden the first substrate, thereby facilitating putting the blade on the outer surface or inner surface of the lid, The precision which forms a half cut in the outer surface or inner surface of a cover material can be improved.

It is a top view of the lid material concerning the embodiment of the present invention. It is sectional drawing of the cover material in line II-II of FIG. 1, and shows the minimum layer structure of a cover material. It is sectional drawing of the lid | cover material in the line III-III of FIG. 1, and shows the layer structure of a lid | cover material. It is the schematic which shows the usage method of the cover material which concerns on embodiment of this invention. It is a top view of the lid material concerning another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, and can be implemented with various modifications within the scope of the gist of the present invention. When embodiments are described with reference to the drawings, the same reference numerals denote the same elements.

<First embodiment>
In the embodiment, as shown in FIGS. 1 and 2, the lid material is formed in order from the outer surface (1) of the lid material to the inner surface (2) of the lid material (A), It can be formed from a laminate comprising a nitrocellulose or polyurethane-based medium layer (4), an easily peelable resin layer (5) and a second substrate (6).
The lid material can be produced by punching the laminate into the shape of a lid.

  Moreover, as FIG. 3 shows, a printing pattern (12) can be formed on a 1st base material (3), and an inner layer can also be arrange | positioned under a 2nd base material (6). Examples of the inner layer include a barrier layer (10) and / or a sealant layer (11). In this case, the lid member is formed from the outer surface (1) of the lid member toward the inner surface (2) of the lid member in order from the printed pattern (12), the first substrate (3), the nitrocellulose or the polyurethane-based medium layer ( 4) It can be formed from a laminate comprising an easily peelable resin layer (5), a second substrate (6), a barrier layer (10) and a sealant layer (11).

  As shown in FIGS. 2 and 3, the first half-cut (8) extends from the inner surface (2) of the lid member to the interface (7) of the easily peelable resin layer (5) and the second substrate (6). ). The second half cut (9) is formed at a depth that substantially reaches the interface (7) from the outer surface (1) of the lid.

  As shown in FIGS. 1 and 3, the first half cut (8) can be formed as an outer surface peeling trigger half cut (8a) or an opening annular line half cut (8b).

  As shown in FIG. 4, the second half-cut (9) includes an outer surface (1) region (1a) covering the first half-cut (8) and another region (1b) of the outer surface (1). ).

  As shown in FIGS. 1 and 4 (a), the lid can have at least one tab on the periphery of the lid. Examples of the tab include an outer surface peeling trigger tab (13) and / or a lid material separation tab (14).

  As shown in FIG. 4B, the easily peelable resin layer (5) can be peeled at the interface (7) with the second substrate (6). Accordingly, when the outer surface peeling trigger tab (13) is picked and pulled up and the region (1a) of the outer surface (1) of the lid member is peeled using the interface (7) as the peeling surface, an opening (16) is formed. be able to.

<Second Embodiment>
In another embodiment, as shown in FIG. 5, a first half cut can be formed on the inner surface of the lid as a straight line and / or an open line. Further, the first half cut formed as a straight line is more preferably a half cut for external surface peeling trigger, and the first half cut formed as an open line is a line-shaped half cut for opening. It is more preferable.
On the other hand, a second half cut can be formed on the outer surface of the lid.

<Components>
Hereinafter, each component of the lid will be described.

<Outer surface of lid>
The outer surface of the lid member is a surface that becomes the outermost surface of the lidded container when the lid member is attached to the container.
For example, as shown in FIG. 2 or 3, the outer surface (1) is the surface of the first substrate (3) or the printed pattern (12).

<Inner surface of lid>
The inner surface of the lid member is a surface that becomes the innermost surface of the lidded container when the lid member is attached to the container.

Also, at least a portion of the inner surface of the lid can be coupled with at least a portion of the container to seal the container. Examples of means for joining the inner surface and the container include a sealing method and a fitting method, and the sealing method is particularly preferable.
Examples of the sealing method include a heat melting method, an adhesive method, and a mechanical bundling method. When sealing the lid material and the molded container, a heat melting method is preferable, and a heat sealing method is more preferable.

  For example, as shown in FIG. 2 or 3, the inner surface (2) is the surface of the second substrate (6) or sealant layer (11). In order to improve the heat sealability between the inner surface (2) and the container, the inner surface (2) is preferably the surface of the sealant layer (11).

<First base material>
A 1st base material is an element which provides predetermined | prescribed intensity | strength or rigidity to a cover material.
Moreover, it is preferable that a 1st base material provides predetermined | prescribed dead hold property to a cover material. For example, in the case of instant fried noodles and a package containing the ingredients or sauce, the lid separating tab (14) is picked and pulled up in the state shown in FIG. 4 (a), and the container (15) The opening is partially exposed, the package containing the ingredients or sauce is removed, and then, if desired, the ingredients are returned to the partially exposed opening of the container (15) and partially exposed. The hot water is poured into the opening of the container (15). If the lid closes during pouring, pouring becomes difficult, so it is preferable that the first base material has a dead hold property.

  Examples of the material of the first base material include paper, metal foil, resin, natural or synthetic fiber. In general, for example, paper such as fine paper, coated paper, and art paper can be used as the first base material. From the viewpoint of forming a print pattern on the first substrate, paper is preferable as the first substrate.

For example, as shown in FIG. 4B, when the region (1a) of the outer surface (1) is peeled off from the second base material (6), the region (1a) is not excessively curved and the inner surface (2 The first base material (3) is 55 g / m ² or more and 170 g / m in order to cause the portion surrounded by the annular ring-shaped half-cut (8b) formed on the outer surface (1) to adhere to the outer surface (1). More preferably, it is formed from paper having a basis weight of ² or less.

  The thickness of the first substrate is not limited, but may be 8 μm or more, and this thickness may be 250 μm or less.

<Medium layer>
A nitrocellulose or polyurethane-based medium layer is a layer formed from nitrocellulose or a polyurethane-based medium.
Further, the nitrocellulose or polyurethane-based medium layer can be strongly bonded to the easily peelable resin layer. Furthermore, the nitrocellulose or polyurethane-based medium layer is preferably formed by printing.

A nitrocellulose or polyurethane-based medium is a composition in which nitrocellulose or polyurethane is dissolved or dispersed in a solvent.
Moreover, it is preferable that a nitrocellulose or a polyurethane-type medium is applied to a 1st base material by printing.

The nitrocellulose or polyurethane-based medium layer has a roughened surface (hereinafter referred to as “rough surface”) in order to ensure adhesion with the easily peelable resin layer, and is easy on the rough surface. A peelable resin layer can be extrusion laminated. In this case, by placing a nitrocellulose or polyurethane-based medium layer between the first substrate and the easily peelable resin layer, the laminate strength of the nitrocellulose or polyurethane-based medium layer and the easily peelable resin layer can be maintained. It is preferable because it is possible.
Examples of the surface roughening treatment include corona discharge treatment, electromigration, ion migration, blasting, air spray, and etching.

  Without wishing to be bound by theory, a medium comprising nitrocellulose or polyurethane is a relatively hard medium. Therefore, the surface of the first base material is hardened by nitrocellulose or polyurethane-based medium, and the hardened surface of the first base material is an easily peelable resin layer from the inner surface of the lid material. When it is formed at a depth that substantially reaches the thickness, it becomes a reinforcing layer for keeping the depth constant. In particular, a nitrocellulose-based medium is particularly preferable because it is considered that the hardness of the base material can be further improved by being intertwined with natural fibers constituting the base material such as paper.

  For example, when the rotary die cutter is inserted from the inner surface of the lid, the first half-cut depth may vary due to the stretchable resin layer stretching. On the other hand, the nitrocellulose or polyurethane-based medium layer is preferable because it becomes a reinforcing layer for preventing the stretchable resin layer from being stretched, thereby suppressing variation in the depth of the first half cut. .

  The thickness of the nitrocellulose or polyurethane-based medium layer is not limited, but may be 0.5 μm or more, and this thickness may be 3 μm or less.

  Examples of the nitrocellulose or polyurethane-based medium include a nitrocellulose-based medium, a polyurethane-based medium, a nitrocellulose-polyamide mixture, a nitrocellulose-alkyd resin mixture, and the like. Examples include “GNCST”, “CCST”, “CCTF”, and “Fine Star” manufactured by Toyo Ink Manufacturing Co., Ltd.

  Moreover, it is preferable that a nitrocellulose or a polyurethane-type medium does not contain toluene substantially from a viewpoint of the influence on an environment, and raw material cost. Furthermore, the nitrocellulose or polyurethane-based medium is more preferably a nitrocellulose-based medium from the viewpoint of resin hardness and raw material cost.

<Easily peelable resin layer>
The easily peelable resin layer is a layer formed of an easily peelable resin.
For example, as shown in FIG. 4B, the easily peelable resin layer (5) can be peeled at the interface (7) with the second substrate (6).

  The easily peelable resin is preferably a resin in which a cyclic olefin copolymer (COC) is mixed with polyolefin at a predetermined ratio.

  Examples of the polyolefin include a polyethylene resin and a polypyrene resin, and it is preferable to use low density polyethylene (LDPE). Examples of the LDPE include a trade name “Petrocene” manufactured by Tosoh Corporation and a trade name “Suntech” manufactured by Asahi Kasei Chemicals Corporation.

  The MFR (Melt Flow Rate) of the polyolefin may be 0.01 g / 10 min or more at a temperature of 190 ° C., and the MFR may be 60 g / 10 min or less at a temperature of 190 ° C.

The density of the polyolefin may be 0.89 g / cm ³ or more, and the density may be 0.94 g / cm ³ or less.

  In the present specification, “cyclic olefin copolymer (COC)” means an α-olefin and a cyclic olefin in a hydrocarbon solvent such as hexane, heptane, octane, cyclohexane, benzene, toluene, and xylene. The copolymer can be obtained by preparing a catalyst such as a so-called Ziegler catalyst or a metallocene catalyst. Examples of such a copolymer include trade name “Apel” manufactured by Mitsui Chemicals, Inc.

  The MFR of COC may be 0.1 g / 10 min or more at a temperature of 190 ° C., and the MFR may be 40 g / 10 min or less at a temperature of 190 ° C.

  The easily peelable resin layer can be adjusted to a desired value by controlling the interfacial peel strength with the second substrate by changing the mixing ratio of LDPE and COC.

  The content of COC in the easily peelable resin may be 1% by mass or more, and the content may be 24% by mass or less. The content of COC is preferably 1% by mass or more and 24% by mass or less because the peel strength of the easily peelable resin layer and the second base material is optimized and the peel strength of both is easily controlled.

  The thickness of the easily peelable resin layer may be 8 μm or more in order to achieve both peelability from the second substrate and adhesion to the second substrate, and the thickness is 30 μm. It may be the following.

<Second base material>
The second substrate is an element that can be peeled at the interface with the easily peelable resin layer.

Since the second substrate can be peeled at the interface with the easily peelable resin layer, the surface wetting tension is 3.5 × 10 ⁻² N / m (ie, 35 dyn / cm) or more, or 4. It may be 0 × 10 ⁻² N / m or more, and the surface wetting tension is 6.0 × 10 ⁻² N / m or less (that is, 60 dyn / cm) or less, or 5.0 × 10 ⁻² N / M (ie, 50 dyn / cm) or less.
The surface wetting tension of the second substrate is adjusted to maintain an optimum adhesive force, and if it is 3.5 × 10 ⁻² N / m or more, inadvertent peeling is suppressed, If it is 6.0 × 10 ⁻² N / m or less, interfacial peeling with the easily peelable resin layer is achieved, which is preferable.

  For example, as shown in FIG. 4 (b), when the outer surface peeling trigger tab (13) is picked up and pulled up, an easily peelable resin layer ( The area | region of the 2nd base material (6) which adheres and accompanies 5) can also have a rough surface from a viewpoint of maintaining the adhesive force with an easily peelable resin layer (5).

  The means for roughening at least a part of the second substrate (6) may be the same as the roughening treatment of the nitrocellulose or polyurethane-based medium layer (4) described above.

Examples of the material of the second base material include paper, metal foil, resin, natural or synthetic fiber, and a resin containing polyester as a main component is preferable.
As resin which has polyester as a main component, polyethylene terephthalate (PET) etc. are mentioned, for example. More specifically, the second substrate is preferably formed from a PET film.

  The thickness of the second substrate may be 8 μm or more, and the thickness may be 250 μm or less.

<Inner layer>
The inner layer is a layer formed on the second base material of the lid member.
Examples of the inner layer include, but are not limited to, a barrier layer, a sealant layer, an adhesive layer, a polymer layer, a printing pattern, an antistatic layer, and a varnish layer. The inner layer is preferably a barrier layer and / or a sealant layer.

<Barrier layer>
The barrier layer is a layer for maintaining the hardness, gas barrier property or dead hold property of the lid member.
As the barrier layer, for example, a metal foil such as an aluminum foil, an inorganic vapor-deposited film on which aluminum or silica is vapor-deposited, or a synthetic resin film having a high gas barrier property such as polyvinylidene chloride, nylon or ethylene-vinyl alcohol copolymer (EVOH) is used. Can be done.

<Sealant layer>
The sealant layer is a layer for heat-sealing the lid material to the container to be sealed with the lid material.

  The material of the sealant layer is selected depending on the material to be sealed, and examples thereof include resins such as LDPE, linear low density polyethylene (LLDPE), ionomer resin, and ethylene-vinyl acetate copolymer. This resin may be in the form of, for example, a stretched or unstretched film or a paint.

  More specifically, the sealant layer may be formed from “Suzuron L” manufactured by Aicello Chemical Co., Ltd., or “CMPS (registered trademark)” easy open film manufactured by Mitsui DuPont Polychemical Co., Ltd.

<Print pattern>
The print pattern is a pattern printed on the substrate.
For example, as shown in FIG. 3, the print pattern (12) may be any pattern printed as the outer surface (1) of the lid.

  There are arbitrary shapes, colors, and uses for the print pattern, for example, shapes such as letters, illustrations, patterns, irregularities, combinations of light-transmitting areas and light-impermeable areas; colors such as black and white, grayscale, and colors A pattern for enhancing the discriminating power of the container, a pattern for managing the container, and a coating pattern for imparting various functions to the container.

<Half cut>
Half cut is a cut formed at a depth less than the thickness of the lid material from the surface of the lid material.
For example, the half cut can be formed by putting a cutter such as a cutter on the surface of the lid. Moreover, a half cut can be formed in the inner surface and / or outer surface of a cover material.

<First half cut>
The first half cut can be formed at a depth that substantially reaches the interface between the easily peelable resin layer and the second substrate from the inner surface of the lid.

  For example, as shown in FIG. 2 or 3, the first half-cut (8) is formed with a depth reaching the vicinity of the interface (7) from the inner surface (2) of the lid member, and more specifically, the inner surface ( 2) from the inner surface (2) to the interface (7), preferably the depth reaching from the inner surface (2) to the interface (7). More preferably, it is formed.

As shown in FIG. 3, when an inner layer is present in the lid member, a lid material is used by using a rotary die cutter having a blade length substantially equal to the sum of the thickness of the inner layer and the thickness of the second base material (6). It is preferable to engrave the first half cut (8).
On the other hand, as shown in FIG. 2, when there is no inner layer in the lid, a first die is used for the lid using a rotary die cutter having a blade length substantially equal to the thickness of the second base material (6). It is preferable to engrave the half cut (8).

  As shown in FIGS. 1 and 5, the first half-cut (8) is for inserting an article, such as a straw, into the opening of the container to form an opening for the contents of the container to pass through. On the inner surface (2) of the lid material in order to form a hole in the lid member or to define a region for initiating the peeling of the easily peelable resin layer (5) from the second substrate (6) Can be engraved.

  Although the number of the first half cuts may be singular or plural, it is preferably plural.

  As shown in FIGS. 1 and 5, the first half-cut (8) is preferably formed as a straight line, an open line and / or an annular line on the inner surface (2) of the lid, More preferably it is formed.

As shown in FIGS. 1, 3, 4 and 5, the first half cut (8) formed as a straight line may be a half cut for outer surface peeling trigger (8a).
Moreover, as FIG. 5 shows, the 1st half cut formed as an open line may be a line-shaped half cut for opening.
Further, as shown in FIGS. 1, 3 and 4, the first half cut (8) formed as an annular line may be an opening annular line half cut (8b).

  As shown in FIG. 4, the outer surface peeling trigger half cut (8a) has an outer surface peeling trigger in order to apply a tensile force to the interface (7) when the outer surface peeling trigger tab (13) is picked up and pulled up. Crossing the tab (13), it can be formed from the inner surface (2) of the lid material at substantially the same depth as the annular ring half-cut (8b). Therefore, the area | region of the cover material for starting peeling of the easily peelable resin layer (5) from the 2nd base material (6) is demarcated by the half cut (8a) for outer surface peeling triggers, and an outer surface A peeling trigger tab (13) is formed.

  In addition, as shown in FIG. 5, the line-shaped half cut for opening is used to allow the contents of the container to pass through when the outer surface area covering the first half cut is peeled off from the inner surface of the lid. Or it can be an incision for passing an article such as a straw and fixing it in place.

Further, as shown in FIG. 4, the opening annular line half-cut (8b) is formed with the region (1a) on the outer surface (1) covering the opening annular line half-cut (8b) as the second base material. When peeling from (6), the portion of the inner surface (2) surrounded by the annular line half-cut for opening (8b) is adjoined and removed while attached to the region (1a) of the outer surface (1). As a result, the opening (16) can be formed.
The aperture (16) can be used, for example, to allow the contents of the container to pass through or to insert an article, such as a straw, into the opening of the container.

  The shape of the circular line half-cut for opening is not limited, but in addition to a circle, an ellipse, a rounded rectangle, an oval, a triangle, a quadrangle, a polygon more than a pentagon, etc. can be freely selected. However, a circular shape without an angle, an elliptical shape, a rounded rectangular shape, an oval shape, or the like is preferable so as not to generate a catch when a portion surrounded by the annular line half cut for opening is generated.

  Although the number of the annular line half-cuts for opening may be one or more, it is usually preferable to have a plurality in order to quickly discharge the liquid in such a size that the packaged material does not flow out.

<Second half cut>
The second half cut can be formed at a depth that substantially reaches the interface between the easily peelable resin layer and the second substrate from the outer surface of the lid.
For example, as shown in FIG. 2 or 3, the second half-cut (9) is formed with a depth reaching the vicinity of the interface (7) from the outer surface (1) of the lid, and more specifically, the outer surface ( Formed at a depth from 1) to the easily peelable resin layer (5), from the outer surface (1) to the interface (7), or from the outer surface (1) to the second substrate (6) Preferably, it is formed with a depth reaching the interface (7) from the outer surface (1).

  As shown in FIGS. 1 and 4, the region (1a) of the outer surface (1) covering the first half-cut (8a, 8b) is separated from the other region (1b) of the outer surface (1), and the lid material The second half cut (9) is preferably engraved across the outer surface (1) or as an annular line on the outer surface (1).

  In addition, by printing nitrocellulose or polyurethane-based medium on the first base material, the first base material is hardened, and the first base material also has improved cutting properties. Variation in depth can be suppressed.

<Tab>
A tab can be formed on the periphery of the lid.
The tab is an element for facilitating the picking of at least a part of the lid member. Moreover, a tab may be called a knob, a knob, a knob, a protrusion, a protrusion, a claw, a pull tab, or a pull top.
Further, the tab can be formed to protrude outward from at least a portion of the periphery of the lid.

The tab is not limited, but includes an outer surface peeling trigger tab (13), a lid material separation tab (14), and the like, as shown in FIG.
The outer surface peeling trigger tab (13) is formed as a region for starting the peeling of the easily peelable resin layer (5) from the second substrate (6). Further, the lid separating tab (14) is formed as an area for starting the separation of the lid from the container.

<Container>
A container is a container which has an opening part and can put an object in an opening part. Further, the opening of the container can be sealed with a lid.

  Moreover, the container may have the flange part used in order to couple | bond a cover material with the periphery of the opening part of a container, for example. Moreover, in order to promote the coupling | bonding with a cover material, the coupling | bonding promoters, such as an adhesive agent, may be arrange | positioned at the flange part.

  The container can store contents such as solid, liquid, gas, and gel. For example, food items such as beverages, pot noodles, yakisoba, pasta, vegetables, boiled eggs; chemicals, cosmetics, detergents, fragrances, pharmaceuticals, etc .; gaseous substances such as air and oxygen are stored in containers be able to.

<How to use>
With reference to FIG. 4, the usage method of the container (15) with which the cover material was attached is demonstrated below.

  When the content of the container (15) contains water, as shown in FIG. 4 (b), the outer surface peeling trigger tab (13) is picked and pulled up, and the outer surface peeling trigger half cut (8a) is passed through. Then, the region (1a) of the outer surface (1) covering the opening annular line half-cut (8b) is cut off from the other region (1b) and peeled off from the inner surface (2). When the region (1a) of the outer surface (1) is peeled off, the region of the inner surface (2) surrounded by the opening annular line half cut (8b) is attached to the easily peelable resin layer (5) ( It is removed along with 1) to form the opening (16). By tilting the container (15) toward the opening (16), the water in the container (15) can be discharged through the opening (16). Moreover, the outflow of the contents can be prevented by keeping the size of the opening (16) smaller than the size of the contents. After draining the water, as shown in FIG. 4 (c), pick and lift the lid separating tab (14), peel the entire lid from the container (15), and take out the contents from the container (15). Can do.

  When the contents of the container are, for example, instant fried noodles and a package containing the ingredients or sauce, the lid separating tab (14) is picked and pulled up in the state shown in FIG. Then, the opening of the container (15) is partially exposed, the package containing the ingredients or the sauce is taken out, and then the ingredients are returned to the partially exposed opening of the container (15) if desired. And pour into the partially exposed container (15) opening. If desired, the lid separating tab (14) is pulled down to reseal the container (15). Depending on the characteristics of the instant fried noodles, after a predetermined time has elapsed, as shown in FIG. Thereafter, as shown in FIG. 4 (c), the container (15) can be fully opened, and the ingredients or the sauce can be charged.

<Manufacturing method>
The lid for sealing the opening of the container can be manufactured by a method comprising the following steps:
Applying a nitrocellulose or polyurethane-based medium to the first substrate to obtain a first member;
A providing step of providing a second substrate;
A laminating step of applying an easily peelable resin between the medium application portion of the first member and the second base material, and laminating the first member and the second base material to obtain a laminate; and The first half-cut is formed at a depth that generally reaches the easily peelable resin application portion from the inner surface side of the laminate, and / or the second at a depth that substantially reaches the easily peelable resin application portion from the outer surface side of the laminate. Half-cut forming process for forming a half-cut.

  If desired, the order of the step of applying the medium and the step of providing the second substrate can be changed. For example, the lamination step can be performed after the medium application step and the second base material providing step are performed separately to obtain the first member and the second base material.

  If desired, in the half-cut forming step, the order of forming the first half-cut and forming the second half-cut can be changed. For example, the step of engraving the second half-cut on the outer surface of the lid can be performed before, during or after the step of engraving the first half-cut on the inner surface of the lid.

The medium application step preferably further includes the following steps:
Providing a first substrate;
Forming a printed pattern on the first substrate;
Applying nitrocellulose or polyurethane-based medium to the first substrate;
Obtaining a first member in which a nitrocellulose or polyurethane-based medium layer is laminated on the first substrate; and roughening at least a portion of the first member.

If desired, the step of forming the print pattern on the first substrate can be omitted.
In addition, the order of the step of forming the print pattern on the first base material and the step of applying the medium to the first base material can be changed, but the lid manufacturing process can be simplified. In order to reduce the manufacturing cost of the material, both steps are preferably performed simultaneously.

  In the step of forming the print pattern on the first substrate, a predetermined pattern such as a character, a picture, or a background color is applied to the first substrate by applying a paint such as ink to the first substrate using a printing machine. Can be printed on the substrate.

  The step of applying the medium to the first base material and the step of obtaining the first member in which the medium layer is laminated on the first base material are preferably performed simultaneously. For example, the first base material This is done by printing a nitrocellulose or polyurethane-based medium on the inner surface side of the film, or molding a nitrocellulose or polyurethane-based medium layer using a mold. More preferably, both steps are performed by printing a nitrocellulose or polyurethane-based medium on the portion of the first substrate on which no print pattern is formed.

The step of roughening at least a portion of the first member can be performed in the same manner as the roughening treatment of the nitrocellulose or polyurethane-based medium layer described above.
The roughened portion of the first member is preferably on the inner surface side of the first member.

  It is also preferable to further perform a step of roughening the outer surface side of the second substrate after the providing step of providing the second substrate. The roughening of the second substrate can be performed in the same manner as the roughening treatment of the nitrocellulose or polyurethane-based medium layer described above.

  After the providing step of providing the second substrate, preferably before the laminating step, the barrier layer, sealant layer, adhesive layer, polymer layer, printing on the surface of the second substrate to which the easy-release resin is not applied It is also preferable to further perform a step of laminating additional layers such as a pattern, an antistatic layer and a varnish layer as an inner layer.

Of the additional layers, the barrier layer and sealant layer are preferably laminated to the second substrate.
For example, an adhesive such as a dry laminate adhesive is applied between the second substrate and the barrier layer to adhere the second substrate and the barrier layer, and then the barrier layer of the second substrate By laminating the side and the sealant layer, it is possible to obtain a second member in which the barrier layer and the sealant layer are laminated on the surface of the second substrate to which the easily peelable resin is not applied.

  The laminating step is performed by extruding an easily peelable resin between the medium application portion of the first member and the inner surface side of the second base material or the second member, and passing through the easily peelable resin layer. It is preferable to carry out by extruding and laminating the member and the second substrate or the second member. In this case, a laminate having the first member and the second base material or the second member facing each other with the easily peelable resin layer in between can be obtained.

The obtained laminate is formed into a lid shape by punching out or cutting out the laminate into a shape suitable for the container, or by bonding the laminate to the container and then cutting out the laminate along the peripheral edge of the container. Can be formed.
If desired, in order to obtain the laminate in the form of a roll or a sheet, the step of forming the laminate in a lid shape may be omitted.

  EXAMPLES The present invention will be specifically described with reference to examples and comparative examples, but the present invention is not limited to the examples.

The evaluation of the laminates or lid materials obtained in the examples and comparative examples will be described below:
(1) Laminate strength Laminates prepared in Examples or Comparative Examples were cut out to a width of 25 mm, and the inner surface of the laminate (ie, easy-peelable resin layer, PET sheet) using a tensile tester (Toyo Seiki's strograph) , The aluminum layer and the sealant layer) are clamped in the direction of gravity, and the outer surface of the laminate (ie, the paper layer) is clamped in the direction opposite to the direction of gravity to perform T-peeling of the laminate. Grade the laminate strength of the laminate according to the following criteria:
○: Material breakage is observed.
X: Partial or total peeling is observed between the paper layer and the easily peelable resin layer, between the medium layer and the easily peelable resin layer, or between the polyamide-based resin layer and the easily peelable resin layer. .
In the present specification, “material breakage” means a state in which the paper layer is broken when the laminate is peeled off in a T-shape because the paper layer and the easily peelable resin layer are firmly bonded. .

(2) Accuracy of half-cut formed on inner surface of lid material Five lid materials prepared in the examples or comparative examples are prepared. Next, the area | region of the outer surface of the cover material which covers the half cut formed in the inner surface of a cover material is pulled up, and it isolate | separates from the other area | region of the outer surface of a cover material. Grade the accuracy of the half-cut formed on the inner surface of the lid according to the following criteria:
(Double-circle): When it peels in the interface of an easily peelable resin layer and PET layer, the defect of hole formation by the lack of half cut engraving, or the tearing of a base material does not generate | occur | produce about all the five cover materials.
◯: When peeled at the interface between the easily peelable resin layer and the PET layer, the formation of holes due to insufficient half-cut engraving or tearing of the substrate occurs for one to three lid members.
X: When peeled at the interface between the easily peelable resin layer and the PET layer, the formation of holes due to insufficient engraving of the half cut or the tearing of the substrate occurs with respect to 4 or 5 lid materials.

[Example 1]
The following materials were prepared:
Paper: “Ryuo Coat 80 g / m ² ” manufactured by Daio Paper Co., Ltd. having a basis weight of 80 g / m ² (thickness: 80 μm)
Medium: Nitrocellulose-based medium, “CCTF (CCST)” manufactured by Toyo Ink Manufacturing Co., Ltd.
Easily peelable resin: 95% by mass of LDPE and 5% by mass of COC LDPE: “Petrocene 226” manufactured by Tosoh Corporation
COC: “Apel 6013T” manufactured by Mitsui Chemicals, Inc.
PET film: “E5100” manufactured by Toyobo Co., Ltd. (thickness: 12 μm)
Dry laminate adhesive: “Takelac A-310” and “Takenate A-3” manufactured by Mitsui Chemicals, Inc.
Aluminum foil: Aluminum foil (thickness: 7 μm) classified as alloy symbol “1N30” according to JIS standard
Sealant: “CMPS VN503” manufactured by Mitsui DuPont Polychemical Co., Ltd.

  Since the laminate obtained in this example had a layer configuration of paper / medium layer / easy-peelable resin layer / PET film / aluminum foil / sealant layer, the surface on which the paper was exposed was laminated or The outer surface of the lid member was defined, while the surface on which the sealant layer was exposed was defined as the inner surface of the laminate or the lid member.

<Preparation of outer surface side member a '>
Using a printing machine, the thickness of the medium layer was set to about 2.0 μm, and the medium was printed on the back surface of the paper according to the following printing conditions to obtain member a.
<Printing conditions>
Version: 175 lines (35 μm)
Medium viscosity: 19 to 21 seconds (ZC # 3)
Printing speed: 30 m / min Drying temperature: 80 ° C

  The member a was subjected to corona discharge treatment to obtain a member a ′.

<Preparation of inner surface side member b '>
Using a laminator, the film thickness of the dry laminate adhesive was set to about 2.0 μm to about 3.5 μm, and the PET film and the aluminum foil were bonded via the dry laminate adhesive to obtain a member b.

  Using a laminator, the thickness of the sealant was set to about 20 μm to about 25 μm, and the sealant was laminated on the aluminum foil exposed surface of the member b to obtain a member b ′.

<Lamination of outer surface side member a ′ and inner surface side member b ′>
Using a laminator, the thickness of the easily peelable resin layer is set to about 20 μm, and the medium exposed surface of the member a ′ and the PET film exposed surface of the member b ′ face each other at a temperature of about 320 ° C. to about 345 ° C. The member a ′ and the member b ′ were extruded and laminated while extruding an easily peelable resin between the medium exposed surface and the PET film exposed surface to obtain a laminate.

<Evaluation of laminate strength>
The laminate strength of the laminate was evaluated as described above, and the results are shown in Table 1 below.

<Production of lid material>
The laminate was punched into a lid shape with a rotary die cutter to obtain a lid material.

  Using a rotary die cutter having a blade length corresponding to the thickness of the cover material from the sealant layer to the PET film (that is, the thickness of the member b ′), the outer surface peeling trigger half cut and An annular half-cut for opening was cut at a depth reaching the easily peelable resin layer from the inner surface of the lid.

  Using a rotary die cutter that has a blade length equivalent to the thickness of the paper in the lid and the thickness of the easily peelable resin layer, remove the peeling half-cut from the outer surface of the lid. It was engraved so as to demarcate a region that covers the half line cut for opening formed on the inner surface of the lid material at a depth reaching the easily peelable resin layer.

<Evaluation of half-cut accuracy>
The accuracy of the half cut formed on the inner surface of the lid member was evaluated as described above, and the results are shown in Table 1 below.

[Example 2]
A laminate and a lid were obtained in the same manner as in Example 1 except that urethane resin (“Fine Star” manufactured by Toyo Ink Manufacturing Co., Ltd.) was used as a medium. The laminate strength of the laminate and the accuracy of the half cut formed on the inner surface of the lid were evaluated as described above, and the results are shown in Table 1 below.

[Comparative Example 1]
A laminate having a layer configuration of paper / easy-peelable resin layer / PET film / aluminum foil / sealant layer was obtained in the same manner as in Example 1 except that the medium was not used. Was also prepared. The laminate strength of the laminate and the accuracy of the half cut formed on the inner surface of the lid were evaluated as described above, and the results are shown in Table 1 below.

[Comparative Example 2]
Paper / polyamide resin layer / easily peelable resin layer / PET film / aluminum in the same manner as in Example 1 except that a polyamide resin (“PANNECO” manufactured by Toyo Ink Manufacturing Co., Ltd.) was used instead of the medium. A laminate having a layer configuration of foil / sealant layer was obtained, and a lid was also prepared from the laminate. The laminate strength of the laminate and the accuracy of the half cut formed on the inner surface of the lid were evaluated as described above, and the results are shown in Table 1 below.

  The present invention can be used for manufacturing a lid for sealing a container having an opening.

DESCRIPTION OF SYMBOLS 1 Outer surface 1a Area | region which covers 1st half cut 1b Other area | region 2 Inner surface 3 1st base material 4 Nitrocellulose or polyurethane-type medium layer 5 Easy peelable resin layer 6 2nd base material 7 Easy peelable resin layer and Interface of second base material 8 First half cut 8a Half cut for outer surface peeling trigger 8b Annular line half cut for opening 9 Second half cut 10 Barrier layer 11 Sealant layer 12 Print pattern 13 Tab for outer surface peeling trigger 14 Lid separation tab 15 Container 16 Opening part

Claims (10)

A lid for sealing the opening of the container,
The lid member, in order from the outer surface of the lid member toward the inner surface of the lid member, includes a first substrate, a nitrocellulose or polyurethane-based medium layer, an easily peelable resin layer, and a second substrate,
The easily peelable resin layer is peelable at the interface with the second substrate,
The first half-cut is formed with a depth that substantially reaches the interface from the inner surface, and / or the second half-cut is formed with a depth that substantially reaches the interface from the outer surface,
A lid for sealing the opening of the container.   The lid according to claim 1, wherein an inner surface side of the medium layer is roughened.   The lid according to claim 1 or 2, wherein the medium layer is formed of nitrocellulose, a mixture of nitrocellulose and polyamide, or a mixture of nitrocellulose and alkyd resin.   The said easily peelable resin layer is a cover material of any one of Claims 1-3 currently formed with the mixture of polyethylene and a cyclic olefin copolymer.   The lid | cover material of any one of Claims 1-4 by which the outer surface side of said 2nd base material is roughened. Applying a nitrocellulose or polyurethane-based medium to the first substrate to obtain a first member;
A providing step of providing a second substrate;
An easily peelable resin is applied between the application portion of the medium of the first member and the second base material, and the first member and the second base material are laminated to form a laminate. And a first half-cut is formed at a depth that substantially reaches the application part of the easily peelable resin from the inner surface side of the laminate, and / or the easily peelable material from the outer surface side of the laminate. A method for producing a lid for sealing an opening of a container, comprising a half-cut forming step of forming a second half-cut at a depth substantially reaching a resin application portion.   The method according to claim 6, wherein the medium applying step is performed by printing the medium on the first substrate.   The method according to claim 6 or 7, further comprising a step of roughening an inner surface side of the first member.   The method of any one of Claims 6-8 which further includes the process of roughening the outer surface side of said 2nd base material.   10. The method according to claim 6, wherein the laminating step is performed by extrusion laminating the easily peelable resin between an application portion of the medium of the first member and the second base material. 2. The method according to item 1.

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