KR101617904B1 - Lid material - Google Patents

Abstract

Wherein the outer surface layer (14) and the inner surface layer (15) are constituted by a peelable laminated sheet which is peelably laminated with the interface between them being peeled off, Cut 4 is formed and the outer half layer 14 of the area covering the formation area of the opening half cut 4 is separated from the outer layer 14 of the other area so as to be separated, The depth of the open half 4 and the half cut 5 for separation are stabilized in the lid member 1 formed at the depth from the outer surface side to the peeling surface.
The paper layer 8, the polyester layer 9a and the resin layer 10 / the polyester layer 9b / the barrier layer 11 / the sealant layer 12 which are easy to peel off and the barrier layer 11 Is laminated on the resin layer 10 which is easily peeled off through the surface subjected to the roughening treatment and laminated with a high peel strength without using an extrusion laminate using an adhesive layer. The interface between the polyester layer 9a adjacent to the paper layer 8 and the resin layer 10 which is easily peeled off is peeled off and peelable. The paper layer 8 is peeled off by application of a varnish Allow to cure.

Description

Lid material {LID MATERIAL}

The present invention relates to a lid member capable of forming an opening for discharging a liquid before the whole is removed and completely opened. More specifically, for example, an instant food such as a Chinese noodle stir-fried in which hot water is poured into a container with a lid and then cooked by taking out the hot water, or vegetables and eggs that are taken out after the water is discharged, The present invention relates to a lid material suitable for packaging.

Conventionally, it has been known that the lid material capable of forming the openings before complete opening is composed of a laminated sheet which is easy to peel off in the layer structure shown in paragraph [0016] of Patent Document 1 and in Figs. 1 (a) and (b) . Specifically, there are a paper layer / a polyester layer (PET layer) / a resin layer / an adhesive layer / an intermediate layer / a sealant layer which are easy to peel (Conventional Example 1) / Resin layer / PET layer / intermediate layer / sealant layer which is easy to peel off (Conventional Example 2). In these Conventional Examples 1 and 2, the interface between the PET layer and the resin layer, which is liable to be peeled off, is peeled off so as to be peelable.

Japanese Patent Application Laid-Open No. 2007-320580

In the above Conventional Example 1, the paper layer and the PET layer outside the peeling surface constitute the outer surface layer, and the inner resin layer, the adhesive layer, the intermediate layer, and the sealant layer, which are easily peeled off from the peeling surface, constitute the inner surface layer. In Conventional Example 2, the paper layer outside the peeling surface, the adhesive layer and the resin layer which is easy to peel off constitute the outer surface layer, and the inner PET layer, the intermediate layer and the sealant layer constitute the inner surface layer than the peeling surface.

However, in order to form a lid capable of forming the openings before completely opened, an annular half cut is formed at a depth reaching from the inner side to the release side, and the half- It is necessary to form the separating half cut that separates the outer surface layer of the region covering the region from the outer surface layer of the other region to make it possible to peel off from the outer surface side to the peeling surface. In Conventional Example 1, it is necessary to form an opening half cut through the adhesive layer to a depth extending from the inner surface side to the release surface, and it is necessary to penetrate the paper layer and form the half cut for separation from the outer surface side. In Conventional Example 2, it is necessary to penetrate the paper layer and the adhesive layer and form a half cut for separation from the outer surface side. By forming the open half cut and the half cut for separation, the inside portion of the opening half cut of the inner layer is adhered to and removed therefrom when the outer surface layer of the area covering the open half cut area is peeled off, It is possible to open the openings.

However, the adhesive layer is intended to obtain good adhesion with a resin layer which is easily peeled off when an outer layer and an inner layer are subjected to extrusion sandwich lamination by extruding a resin layer which is easy to peel off and which is easy to peel off , Polyethylene, and other flexible and elastic synthetic resin layers. Also, the paper layer is flexible and elastic. If there are many flexible and elastic layers, there is a problem that when the half cut is formed through these layers, the depth of the half cut tends to be uneven. If the depth of the half cut is insufficient, it is difficult to separate the opening lid part or the inside part of the opening half cut of the inner surface layer can not be removed. Also, if the depth of the half cut is too deep, the seal strength and strength of the lid member become insufficient.

An object of the present invention is to provide a lid material capable of forming openings before completely opened, so that the formation depth of the opening half cut and the half cut for separation can be stabilized.

For this purpose, the present invention is characterized in that the outer surface layer and the inner surface layer are constituted by a peelable laminated sheet which is peelably laminated with the interface of the both peeled off, And a separating half cut that separates the outer surface layer of the area covering the formation area of the opening half cut from the outer surface layer of the other area and makes it possible to peel off is provided on the peeling surface from the outer surface side PET layer / PET layer / barrier layer / sealant layer, which are easy to peel off, from the outer surface side, and the peeling layer Either one of the PET layers disposed with an easy resin layer interposed therebetween is laminated to the resin layer which is easy to peel off via a surface subjected to surface roughening treatment, And the peelable surface is peeled off at the interface between the other PET layer and the peelable resin layer, and the paper layer is hardened by application of varnish.

In the present invention, destabilization of the formation depth of the half-cut for separation due to the presence of the paper layer is solved by curing the paper layer by varnish application. Further, destabilization of the formation depth of half cut or half cut for separation due to the adhesive layer interposed on one side of the resin layer which is easy to peel off is caused by the fact that the PET layer is made to abut on both sides of the resin layer, The PET layer laminated on the opposite side to the peeling surface is laminated with the resin layer which is easily peeled off through the surface subjected to the roughening treatment to firmly laminate without using the adhesive layer. According to the present invention, since the formation depths of the half cut for separation and the half cut for opening are stable, the incidence of defective products can be reduced. Further, according to the present invention, since the formation of the adhesive layer is not necessary, the manufacturing process is simplified and the manufacturing cost can be lowered compared with the conventional laminated sheet which is easily peeled off.

1 is a plan view showing an example of a lid according to the present invention.
2 is an enlarged cross-sectional view taken along the line A-A in Fig. 1 in which the intermediate portion is omitted.
3 is an explanatory diagram of an example of use of the lid material according to the present invention.
Fig. 4 is an enlarged cross-sectional view corresponding to A-A in Fig. 1, omitting an intermediate portion showing another example of the lid according to the present invention. Fig.

Hereinafter, the present invention will be further described with reference to the drawings. In the drawings described below, the same reference numerals denote the same elements.

As shown in Figs. 1 and 2, the lid member 1 is formed of a laminated sheet which is easy to peel off, and is punched in the shape of a necessary lid. The lid material 1 of the present embodiment has a part of a substantially circular rim extending outward to form a tab 2 for opening and a part of a rim on the opposite side to the opening tab 2 And the peeling tab 3 is formed. An annular half cut 4 is formed from the side of the inner surface (the inner side of the package), and from the side of the outer surface (the outer side of the package) A half cut 5 is formed. The peeling half-cut 6 is formed on the base of the peeling tab 3 from the inner surface side.

As shown in Fig. 2, the peelable laminated sheet constituting the lid material 1 is composed of a paper layer 8, a PET layer 9a, a peeling layer 8a, And is a laminate in which an easy resin layer 10, a PET layer 9b, a barrier layer 11, and a sealant layer 12 are stacked in this order. In the figure, reference numeral 7 denotes a varnish impregnated layer that has been coated with the varnish penetrated into the paper layer 8 and cured. The peelable laminated sheet of the present embodiment is such that the interface between the PET layer 9a adjacent to the paper layer 8 and the resin layer 10 which is easily peeled off can be peeled off and the peeled surface 13 is peeled off, As shown in Fig. That is to say, the paper layer 8 and the PET layer 9a adjacent to the paper layer 8 constitute the outer surface layer 14 with the peeling surface 13 as a boundary, and the resin layer 10, The PET layer 9b, the barrier layer 11 and the sealant layer 12 constitute the inner surface layer 15. When the outer surface layer 14 and the inner surface layer 15 are peeled off from each other, ), And is peelably laminated.

Each layer will be described.

As the varnish for hardening the paper layer 8, any of an aqueous varnish, an oil-based varnish, and an ultraviolet curing varnish may be used. Specifically, acrylic varnish, urethane varnish, and vaginal screen varnish can be used. Of these, a quality screen system varnish is preferable in that an appropriate hardness is obtained. The amount of the varnish to be applied is preferably such that the coating thickness is about 0.5 to 4.0 占 퐉 in order to harden the paper layer 8 to have good cutability.

As the paper layer 8, for example, general paper such as high quality paper, coat paper and the like can be used. The paper layer 8 gives the lid material 1 the necessary strength and rigidity and peels the outer surface layer 14 of the region covering the formation area of the opening half cut 4 from the inner surface layer 15 It is preferable that it is made of paper having a weight per unit area of 35 to 170 g / m ² so as not to be significantly curved when it is raised. When the outer surface layer 14 is greatly curved at the time of lifting up, the inner part of the opening half cut 4 of the inner surface layer 15 is easily detached without being adhered to the outer surface layer 14.

As the PET layers 9a and 9b, a known PET-based film (a film composed mainly of PET) having a thickness of 2.5 to 25 占 퐉 can be used, but it is preferable to use a PET film as the material. The PET layer 9a on the side of the outer surface layer 14 is a layer which forms the peeled surface 13 with an interface between the resin layer 10 and the peelable resin layer 10 and has a surface wet tension of 3.5 x ^{10 -2 N / m (35dyn /} cm) ~ 6.0 × 10 -2 N / m (60dyn / cm) preferably less than or equal to, the surface wetting tension of ^{4.0 × 10 -2 N / m (} 40dyn / cm) ~ 5.0 × And particularly preferably 10 < ^-2 > N / m (50 dyn / cm) or less. If the surface wetting tension is less than 3.5 x 10 < ^-2 > N / m, the adhesive force is too low to cause inadvertent peeling. On the other hand, if it exceeds 6.0 x 10 < ^-2 > N / m, the adhesive force is excessively improved and it becomes difficult to peel off from the resin layer 10 which is easily peeled off. The PET layer 9b on the side of the inner layer 15 is a layer adhered to the resin layer 10 which is easy to peel off with a strength not easily peeled off and the resin layer 9b, The adhesion strength between the resin layer 10 and the resin layer 10 is determined by performing a surface roughening treatment such as corona discharge treatment on the surface of the resin layer 10 which is easily peeled off from the PET layer 9b It is a strength.

The easily peelable resin layer 10 is a resin obtained by mixing a cycloolefin copolymer (COC) with a polyolefin at a predetermined ratio. As the polyolefin, polyethylene resin, polypropylene resin and the like can be mentioned, but it is preferable to use low density polyethylene (LDPE). Herein, COC means that the? -Olefin and the cyclic olefin are reacted in a hydrocarbon solvent such as hexane, heptane, octane, cyclohexane, benzene, toluene, xylene and the like in the so-called Ziegler catalyst or metallocene catalyst And is a copolymer obtainable by preparing a catalyst. As such a copolymer, there is a trade name " APEL " manufactured by Mitsui Chemicals, Inc. As the LDPE, there is a trade name " Suntec ", manufactured by Asahi Chemical Industry Co., The MFR (melt flow rate) of the polyolefin is preferably 1 to 50 (g / min), more preferably 1 to 10 (g / min). The polyolefin preferably has a density of 0.89 to 0.940 (g / cm ³ ). The cyclic olefin copolymer (COC) preferably has an MFR of 1 to 40 (g / min), more preferably 5 to 25 (g / min).

Since the peelable resin layer 10 can control the interface peel strength with the PET layer 9a on the outer layer 14 side by changing the mixing ratio of LDPE and COC, the interface peel strength can be adjusted to a desired value It is possible to do. The content of COC in the mixed resin constituting the resin layer 10 which is easily peeled off is preferably 1 to 24% by weight, particularly preferably 5 to 20% by weight. If the content is less than 1%, the peeling strength with the PET layer 9a becomes strong and it becomes difficult to peel off. If it is more than 24%, it becomes difficult to control the peel strength. The thickness of the resin layer 10 which is easy to peel off is preferably 10 m to 30 m in order to obtain stable peelability with the PET layer 9a and to obtain stable adhesion with the PET layer 9b .

As the barrier layer 11, a metal foil such as an aluminum foil can be used. A synthetic resin film having a high gas barrier property such as polyvinylidene chloride may also be used.

The sealant layer 12 is a layer for heat sealing the lid material 1 to a container to be sealed by the lid material 1 and is selected depending on the material to be sealed, For example, LDPE, linear low density polyethylene (LLDPE), ionomer resin, ethylene vinyl acetate copolymer and the like.

The peelable laminated sheet described above is obtained by laminating a laminate obtained by dry lamination of a paper layer 8 and a PET layer 9a and a laminate obtained by dry laminating a PET layer 9b and a barrier layer, It can be easily obtained by extruding a readily peelable resin, sandwiching it with an extruded sandwich laminate, and then forming a sealant layer. The easily peelable laminated sheet is laminated at an adhesive strength that can not be easily peeled except that the PET layer 9a on the outer surface layer 14 side is easily peeled off from the resin layer 10 which is easily peeled off .

When the outer surface layer 14 of the formation area of the opening half 4 is peeled off from the inner surface layer 15, the opening half cut 4 is attached to the outer surface layer 14, (See FIG. 3) by the removal of the conductive layer 16 from the surface. The open half cut 4 is formed to have a depth from the inner surface side to the peeling surface 13. In this example, when the opening half cut 4 is formed, the PET layer 9b on the inner surface layer 15 side and the resin layer 10, which is easily peeled off, are firmly adhered without using an adhesive layer It is possible to prevent a large variation in the formation depth.

The shape of the open half cut 4 is not particularly limited as long as it is an annular shape. It is freely selectable from a circle, an ellipse, a rounded rectangle, an oval, a triangle, It is preferable that a circle, an oval, a rounded rectangle, an oval or the like without an angle is used. The open half cut 4 may have a single or multiple openings, but it is preferable that a plurality of the open half cuts 4 are formed in order to facilitate discharge of the liquid to a size that does not allow the articles to flow out.

A half cut 5 for separation is formed across the outer surface layer 14 between the outer surface layer 14 covering the forming area of the opening half cut 4 and the outer surface layer 14 of the other area . The separating half cut 5 separates the outer surface layer 14 covering the forming area of the opening half cut 4 from the outer surface layer 14 of the other area and is capable of separating from the inner surface layer 15 , And the depth from the outer surface side to the peeling surface (13). In the present example, the paper layer 8 is hardened by the application of the varnish when the half cut 5 for separation is formed, and the cutting performance of the paper layer 8 is improved. Therefore, It is possible to prevent a large variation in the formation depth of the cut 5. Although the separating half cut 5 is usually formed in a continuous linear shape, it may be formed, for example, in the form of continuous small perforations or intermittent lines.

The peeling half cut 6 serves to apply a tensile force to the interface between the outer layer 14 and the inner layer 15 when the peeling tab 3 is pulled upward. And is formed to have the same depth as the opening half cut 4 from the inner surface side.

The peeling tab 3 is for facilitating peeling off of the outer surface layer 14 covering the formation area of the opening half cut 4 and is formed so that the outer periphery of the outer surface layer 14 covering the formation area of the opening half- (outer edge). The opening tab 2 is provided for facilitating pulling of the lid material 1 when the entire lid material 1 is peeled off from the object to be sealed and the outer surface layer 14 covering the formation area of the opening half- (The outer surface layer 14 which is peeled off at the time of forming the openings 16).

Next, a use example of the lid material 1 according to the present invention will be described with reference to Fig.

As shown in Fig. 3 (a), the lid material 1 is usually used for encapsulating the container 17. The sealant layer 12 is placed on the container 17 with the cover member 1 placed on the container 17 side and the sealant layer 12 is placed on the flange portion 18 protruding from the opening of the container 17 By heat sealing.

For example, a case in which vegetables and eggs are stored is described as an example.

3 (b), the peeling tab 3 is pulled upward, and the outer surface layer 14 covering the forming area of the opening half cut 4 is cut into a half cut for separation Is separated from the outer surface layer (14) of the other area through the adhesive layer (6), and is peeled off from the inner surface layer (15). At the time of peeling off the outer layer 14, the inner portion of the opening half cut 4 of the inner layer 15 is removed with adhering to the outer layer 14, and the openings 16 are formed . The water in the container 17 can be discharged from the openings 16 by tilting the container 17 toward the opening 16 after the formation of the openings 16. [ In addition, by making the size of the opening 16 smaller than the package, leakage of the article to be packaged can be prevented.

After releasing the water, the opening tab 2 is lifted upward as shown in Fig. 3 (c), the entire lid material 1 is peeled from the flange portion 18 of the container 17, and the container 17 ) Is completely opened, and the package is taken out.

3 (a), the opening tab 2 is pulled out so that the opening of the container 17 is partially opened, and the materials, sources, and the like Pull out the package and pour hot water. 3 (b), the openings 16 are formed so as to follow hot water, and the openings of the container 17 are fully opened as shown in FIG. 3 (c) .

Next, another example of the lid according to the present invention will be described with reference to Fig.

The lid material 1 'of the present example can be peeled off as the peeled surface 13 between the resin layer 10 which is easily peeled off and the PET layer 9b on the inner surface layer side, 1 and 2 except that the surface of the layer 9a which is susceptible to separation of the resin layer 10 is roughened and the resin layer 10 which is easily peeled off is located on the outer surface layer 14 side. Is the same as that of the lid material (1). Even in this way, the same advantages as in the above-described example can be obtained.

<Examples>

Example 1

A peelable laminated sheet having a paper layer / PET layer / resin layer / PET layer / easy to peelable / peelable layer / aluminum foil / sealant layer layer in the order from the outer surface side was prepared, and a lid material was prepared from the peelable laminated sheet. The laminated sheet easy to peel off was produced by the following procedure.

First, a PET layer and an aluminum foil were dry-laminated together with a dry laminate of the paper layer and the PET layer that had been subjected to the coating and varnish hardening of printing and varnish. After the corona discharge treatment was applied to the surfaces of the aluminum foil and the laminated PET layer, a paper layer and a laminated PET layer were laminated, and a PET layer laminated with an aluminum foil and subjected to corona discharge treatment was coated with a resin Was extruded and extruded sandwich laminate. A sealant was extrusion-laminated on the surface of the aluminum foil of the obtained laminate to prepare a laminated sheet which was easy to peel off. The outer surface layer of the peelable laminated sheet in this example is a paper layer and a PET layer, and the inner surface layer is a resin layer which is easy to peel off, a PET layer, an aluminum foil and a sealant layer, The interface between the resin layers which are easily peeled off is peeled off and peelable.

The materials of each layer are as follows.

The paper layer was coated with a coating paper having a weight per unit area of 80 g / m ² (80 탆 in thickness) and printed on the outer surface thereof, followed by coating and drying the OP varnish. The application of the OP varnish was performed so that the coating thickness became 1 to 2 mu m.

The dry lamination of the paper layer and the PET layer was carried out through a dry laminate adhesive coated with 3 g / m ² (thickness 3 μm). The thickness of the PET layer adjacent to the paper layer was 12 mu m.

As a resin layer which can be peeled off, a mixed resin of "APEL" (trade name) manufactured by Mitsui Chemicals, Inc. and "Suntech" (trade name) manufactured by Asahi Chemical Industry Co., Ltd. was used and the thickness was 20 μm.

The dry lamination of the aluminum foil and the PET layer was carried out through a dry laminate adhesive coated with 3 g / m ² (thickness 3 μm). The thickness of the aluminum foil was 6.5 mu m.

As the sealant layer, a polyethylene resin "CMPS" made by Mitsui DuPont Polychemical Co., Ltd. was used and extrusion laminated at 240 ° C.

80 sheets of lid material were punched out from the peelable laminated sheet. For the obtained lid material, the outer surface layer of the area covering the formation area of the open half cut was separated from the outer surface layer of the other area and was peeled to form openings. The peeled state was observed, And the presence of poor openings due to lack of benches in open half cuts. As a result, the lid material causing the peeling and pitting failure did not occur, and the defect occurrence rate was 0%.

Comparative Example 1

80 sheets of lids were prepared in the same manner as in Example 1 except that varnish was not applied to the paper layer, and the same irradiation was carried out. As a result, peeling was observed for 9 out of 80 pieces, and the defect occurrence rate was 11.3%.

1, 1 '
2 opening tabs
3 peeling tab
Four common half cuts
5 Half cut for separation
6 Half cut for peeling
7 varnish impregnated layer
8 paper layers
9a, 9b A polyester layer (PET layer)
10 Easy-to-peel resin layer
11 barrier layer
12 Sealant layer
13 If you peel it
14 outer layer
15 inner layer
16 openings
17 containers
18 flange portion

Claims (1)

Wherein the outer surface layer and the inner surface layer are constituted by a readily peelable laminated sheet which is peelably laminated with the interface between the outer surface layer and the inner surface layer being formed as an annular opening half cut at a depth from the inner surface side to the peeling surface The separating half cut for separating the outer surface layer of the area covering the formation area of the opening half cut from the outer surface layer of the other area and making it possible to peel off is formed at a depth from the outer surface side to the release surface ,
A polyester layer, a polyester layer, a barrier layer, and a sealant layer which are laminated in this order from the outer surface side in the order of paper layer / polyester layer / peelable resin layer / polyester layer / barrier layer / sealant layer, Layer is laminated on the resin layer which is easy to peel off via the surface subjected to the roughening treatment and the interface between the other polyester layer and the peelable resin layer is peeled off, Characterized in that the paper layer is cured by application of a varnish.

Images