JP2000255619A - Heat sealing lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of curls, and to improve the separation of paper sheets from each other by providing discontinuous recessed patterns and/or projecting patterns whose area is equivalent to the area of the specified ratio to its whole area at least on the single side of a heat sealable lid material comprising at least two laminates. SOLUTION: Discontinuous recessed patterns 11a and/or projecting patterns 11b are provided on a laminate 1 using a recessed and/or projecting patterning roll to form a lid member 10. The patterns are not limited so long as they are discontinuous. The area of patterning portions, i.e., the total area of projecting or recessed portions from the original laminate 1 is limited to 1-80% of the total area, and preferably, 3-70%. The distance between the adjacent patterns 11a or 11b (the projecting or recessed portions) is preferably 0.2-15 mm. Since the continuous deformation stress is broken at discontinuous non-machined portion of the lid member, the lid member 10 free from curls and excellent in separation can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid material for packaging containers of foods, beverages, pharmaceuticals, quasi-drugs, electronic parts, etc., and more particularly to a heat sealing lid material suitable for an automatic single-sheet feeding system.

[0002]

2. Description of the Related Art Conventionally, lids used for containers and packaging of foods, beverages, pharmaceuticals, quasi-drugs, electronic parts, etc. are made of at least two or more materials such as paper, synthetic resin, aluminum foil, etc. As shown in FIG. 9, continuous molding is generally performed by embossing or the like in order to improve the separation suitability of each sheet. Depending on the lamination structure, curling occurs due to the difference in elasticity and elongation of each layer depending on the lamination structure, and problems such as poor supply and misalignment often occur when supplying the lid material.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat-sealing lid material which is free from curling and has good sheet-to-sheet separation properties.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a heat-sealing lid material for a packaging container comprising a laminate of two or more layers having a heat-adhesive resin layer. Discontinuous concave and / or convex shapes corresponding to 1% to 80% of the entire area were provided. Preferably, the lid comprises at least one layer of aluminum foil or paper.

[0005] By performing the above-described molding,
The sheet separation property is improved, and the occurrence of curling can be prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a laminate 1 for forming the heat sealing material according to the present invention is obtained by laminating a base material 2 and a heat-adhesive resin layer 3. The substrate 2 may be any of a simple substance or a composite such as a synthetic resin, a metal foil, and paper. For example, a composite of an exterior resin film 21, an aluminum foil 22a, and a reinforcing resin film 23 as shown in FIG.
As shown in FIG. 3, a composite of an exterior resin film 21, a metal or inorganic oxide deposited layer 22b, and a reinforcing resin film 23, and a composite of paper 24 and the reinforcing resin film 23 as shown in FIG.

As the exterior resin film 21, polyester (PET), polypropylene (PP), nylon (NY), cellophane, or the like can be used, and usually a thickness of about 5 to 50 μm is preferable. Aluminum foil 22a
As pure aluminum (JIS 1000 system), A
l-Mn type (3000 type), Al-Mg type (500 type)
0-type), Al-Fe (8000-type), and the like, and usually a thickness of about 5 to 50 μm is preferable. Reinforced resin film 23
As for the exterior resin film, PET, PP,
NY, polyethylene (PE), polyvinyl chloride (PV
C) and an ethylene-vinyl alcohol copolymer (E
VOH) can be used. The preferred thickness of the reinforcing resin film 23 is about 5 to 100 μm. When the paper 24 is used, coated paper, Japanese paper, kraft paper, pure white roll paper, woodfree paper, recycled paper, imitation paper, etc. can be used, and the thickness is 20.
About 150 μm is preferable. When the vapor deposition layer 22b is employed, for example, 300 to 12
Aluminum deposited with a thickness of 00 Angstroms,
Examples thereof include alumina and silicon oxide. The synthetic resin film may be an exterior resin film 21 or a reinforcing resin film 2
3 may be used.

The thermal adhesive resin layer 3 includes polyacrylate, styrene-butadiene-ethylene block copolymer, acryl-nitrile (AN), PE, PP, vinyl chloride-vinyl acetate-maleic acid terpolymer, Ethylene-vinyl acetate (EVA), methyl methacrylate,
Polystyrene (PS) or the like can be used. In the case of a sealant film, the thickness is preferably about 15 to 100 μm, and in the case of coating, the thickness is preferably about ^{2 to} 15 g / m ² (weight after drying).

As a method of laminating each layer constituting the laminate 1, a known method can be adopted, for example, a two-component reaction type polyester,
Alternatively, lamination can be performed by a method such as dry lamination using a two-component reaction type polyester / polyurethane-based adhesive, wet lamination using a solvent-type adhesive, coextrusion, extrusion lamination, or the like. Further, a print layer, an anchor coat layer (AC), an overcoat layer, and the like may be formed at an arbitrary position. The total thickness of the laminate 1 is 3
0 to 200 μm is preferable, and when the total thickness is less than 30 μm,
It is not preferable because breakage and cracking may occur during the molding of the concave and / or convex or the distribution of the package. On the other hand, if the total thickness exceeds 200 μm, the flexibility of the obtained lid material is poor, and the easy-openability may be impaired, which is not economically preferable.

As shown in FIG. 5, a discontinuous concave forming 11a and / or convex forming corresponding to 1% to 80% of the entire area of the surface of the laminate 1 using concave and / or convex forming rolls. By applying 11b, the lid material 10 of the present invention is obtained. Here, the term “discontinuous” means that an unprocessed flat portion 12 that is not press-molded is interposed between adjacent moldings 11a or 11b.

The concave and / or convex molds 11a,
11b may be applied from any direction of the outermost surface (the surface not in contact with the container), the innermost surface (the surface in contact with the container) or both surfaces of the laminate 1, and may be appropriately used depending on the configuration and use of the laminate 1. Further, the concave and / or convex may be on only one side of the laminate, or may extend over both sides, and can be used properly depending on the situation. The height of the convex mold 11b or the depth of the concave mold 11a is:
Although not particularly limited, in practice, 1 to 50
It is about 0 μm. Convex mold 11b or concave mold 11
The pattern of a is not particularly limited as long as it is discontinuous. Patterns, letters, numbers, simple geometric figures, symbols, trade names, business names, arbitrarily designed figures, people, animals, anime characters, etc. Alternatively, it is possible to form a design including a combination thereof. The size of each pattern is not particularly limited, but is 0. 0 in each of the vertical and horizontal directions.
It is about 2 to 15 mm.

The area of the molded portion after molding, that is, the total area of the protruding or depressed portion from the original laminate 1 is
It is necessary to be within the range of 1 to 80% of the entire surface, preferably within the range of 3 to 70%. If less than 1%, the lid material 10
When the content exceeds 80%, discontinuous molding becomes difficult and curling is likely to occur. Further, the distance between the adjacent moldings 11a or 11b (convex or concave) is preferably about 0.2 to 15 mm, and if less than 0.2 mm, discontinuous molding becomes difficult. On the other hand, if it exceeds 15 mm, the suitability for separation of the lid 10 may be poor.

The lid member 10 of the present invention can be obtained by appropriately cutting or punching out the laminate 1 having the above-mentioned concave and / or convex molds 11a and / or 11b formed thereon. The container to which the lid member 10 can be applied can be applied to a container made of a synthetic resin, a glass container, a paper container, or a combination thereof, and preferably has a flange at the container opening.

[0014]

EXAMPLES and COMPARATIVE EXAMPLES A laminate having the following structure was produced by a conventional method. The number without the unit is the material (layer)
Is shown in μm. D is dry lamination, AL is aluminum foil (JIS 1N30 soft foil), PPE is a blend film of PE and PP (manufactured by Toyo Aluminum Co., Ltd.), OP is overcoat, and other abbreviations are described in the above text. I have.

Next, FIGS. 6 (A) to 6 (E) (the depth of the concave portion is about 50 μm as viewed from the outermost surface of the laminate) and conventional molding (# 120 and # 60 silk molding). (M and N, respectively) were prepared, and a cover with a grip (diameter of about 90 mm) shown in FIG. 7 was punched out.

(1) 12 PET / D / 30AL / D / 3
0-modified EVA film (2) 64 g / m ² paper / PE / 9AL / AC / 20PE
/ 20EVA (3) OP coat / 30AL / D / 50PPE film (4) 58g / m ² paper / PE / silicon oxide deposited PET /
AC / 20PE / 20EVA (5) 50 PET / D / 30PPE film The following evaluations were performed for the above Examples and Comparative Examples.
FIG. 8 shows the results.

[Suitability for Separation]
00 sheets were stacked, sandwiched between flat glass plates, a weight was placed on the lid so that a pressure of about 1 kg / cm ² was applied, and the lid was allowed to stand on a horizontal desk for 24 hours. After a lapse of 24 hours, the lid material is taken out and automatically sucked using a rubber suction cup, and a material in which each leaf of 100 lid materials is separated smoothly is good (良), and at least two lid materials are adhered. Those which had to be separated by hand were judged to be defective (x).

[Curlability] From the molded laminate, 1
A 50 mm square specimen was cut out, and the degree of curl was evaluated by a 100 mm length cross cut method. Judgment is good (良) when the lifting distance from the plane is within 5 mm.
Those exceeding 5 mm were regarded as defective (x). Here, the cross-cut method means that a double-sided tape is adhered on a smooth glass surface so as to form a square having an inner side of 100 mm x 100 mm, and a sample is placed thereon such that the heat-adhesive resin layer side is an upper surface or a lower surface. The sheet was pasted, cut in a diagonal line with a cutter knife so as to form an X shape, and the maximum height (distance) separated (floated) from the glass surface was measured from the side. This test was performed on both sides of the test piece, and the larger value was adopted and evaluated.

[0019]

By forming a discontinuous concave and / or convex shape on one or both sides of the lid material,
In the discontinuous unprocessed part, continuous deformation stress is cut off, and a flat lid material without curl and a heat sealing lid material with good separation suitability can be obtained, especially for the filling line of automatic sheet feeding system. It is suitable as a lid material. Further, even in the case of a manual filling line, it is not necessary to correct the curl, which can contribute to an improvement in productivity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a laminate forming a lid material of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of a base material of a laminate.

FIG. 3 is a cross-sectional view showing another example of the base material.

FIG. 4 is a sectional view showing still another example of the base material.

FIG. 5 is a cross-sectional view showing an example of a lid member.

FIG. 6 is a plan view showing a mold pattern of a lid material of an example and a comparative example.

FIG. 7 is a plan view showing the shape of the lid material of the above.

FIG. 8 is a table showing test results of Examples and Comparative Examples.

FIG. 9 is a sectional view showing a conventional lid member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base material 3 Thermal adhesive resin layer 10 Lid material 11a Concave shape 11b Convex shape 12 Unprocessed flat part 21 Exterior resin film 22a Aluminum foil 22b Metal or inorganic oxide vapor deposition layer 23 Reinforcement resin film 24 Paper

Claims (2)

[Claims] 1. A heat-sealing lid comprising a laminate of two or more layers having a heat-adhesive resin layer, wherein at least one surface has
A heat-sealing lid material having discontinuous concave and / or convex shapes corresponding to 1% to 80% of the entire area of the surface. 2. The heat-sealing lid material according to claim 1, comprising at least one layer made of aluminum foil or paper.