JPH07285575A - Cup-shaped container lid material - Google Patents

Abstract

(57) [Summary] [Purpose] A cup that does not separate from the sealant layer during storage because the aluminum foil layer in the composition is oxidized by gas or moisture generated from the paper layer and is easy to open when opening the container. Provided is a lid for a container. [Structure] A first printing layer is provided on a paper layer surface of a laminated base material composed of a paper layer, an adhesive layer and an aluminum foil layer, a primer coat layer is provided on the aluminum foil layer surface, and a second printing is performed on the primer coat layer surface. A layer is provided and a sealant layer is provided on the surface of the second printing layer.

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 a cup-shaped container used for instant foods such as noodles and soups, foods such as prepared foods, frozen desserts, dairy products and non-foods such as stationery.

[0002]

2. Description of the Related Art Conventionally, a sheet-shaped lid member made of a laminated base material mainly consisting of paper and aluminum foil is formed by vacuum-molding or pressure-molding a sheet of polystyrene or polypropylene or a cup made of polypropylene by thin-wall injection molding. It is used as a container. The structure of this lid material was, for example, the (upper) print layer / paper layer / adhesive layer / aluminum foil layer / printing layer / sealant layer (lower) structure shown in FIG. The print layers are provided on the upper side and the lower side of the lid material in order to increase the amount of information and to display a lottery for a prize on the lower side.
The sealant layer is a layer formed of a resin that is heat-sealed by the heat sealing method.

[0003]

However, when letters and pictures are printed on the upper and lower surfaces of a roll-shaped laminated base material consisting of a paper layer, an adhesive layer and an aluminum foil layer, and the roll-shaped rolled base material is wound and stored. The aluminum foil layer may be oxidized by gas (evaporation / sublimation component) or water generated from the paper layer. When the sealant layer was formed on the lower surface in the state where the aluminum foil layer was oxidized, the lid material sometimes peeled off from the sealant layer during storage of the container. In order to solve this problem, for example, the (upper) printing layer / paper layer / adhesive layer / aluminum foil layer / polyethylene layer / printing layer / sealant layer (lower side) disclosed in Japanese Utility Model Laid-Open No. 4-83628 is used. There is something. This is a polyethylene layer covering the aluminum foil layer to prevent oxidation of the aluminum foil layer due to gas and moisture generated from the paper layer when it is wound up and stored after printing. Since the lid was put in, the total thickness of the lid material was thick and the waist became strong, and it was difficult to open the container when opening it.

The present invention solves the above-mentioned conventional problems, and the aluminum foil layer in the structure is not oxidized by the gas or moisture generated from the paper layer and does not peel off from the sealant layer during storage. Moreover, the present invention provides a lid for a cup-shaped container that is easy to open when opening the container.

[0005]

The first invention, as shown in FIG. 1, is a paper layer (of a laminated base material comprising a paper layer (12), an adhesive layer (13) and an aluminum foil layer (14). 12) surface is provided with a first printing layer (11), said aluminum foil layer (14) surface is provided with a primer coating layer (15), and this primer coating layer (15) surface is provided with a second printing layer (16)
And a sealant layer (17) provided on the surface of the second printing layer (16), which is a lid member (10) for a cup-shaped container.

A second aspect of the present invention is characterized in that the primer coat layer (15) according to the first aspect uses any one of organic titanate, maleated polyolefin and ethylene acrylic acid. It is a lid material (10) for a cylindrical container.

In the manufacturing process of the above-mentioned cover material, the paper layer (12), the adhesive layer (13), and the aluminum foil layer (14) are wound into a laminated base material by a dry lamination method, an extrusion lamination method, or the like. The process of producing and the first printing layer (1
1), a step of forming the primer coating layer (15) and the second printing layer (16), and a sealant layer (by a extrusion lamination method) on the roll-shaped laminated base material on which the printing layer and the primer coating layer are formed ( 17) and the step of forming.

The thickness of the primer coat layer (15) is 0.1 to 5 μm, preferably 1 to 3 μm, and the thickness of the second printing layer (16) formed on this primer coat layer (16) is large. For printing, vinyl chloride-vinyl acetate copolymer system, nitrified cotton type, urethane type, nitrified cotton polyamide type,
Ink such as vinyl acrylic type and nitrified cotton butyral type is used. The first printing layer (11) may be printed by using a general ink that is printed on the paper surface.

The sealant layer (17) is composed of ethylene-ethyl acrylate (EEA), ethylene-methacrylic acid co-trimer (EMAA), ethylene-vinyl acetate (E).
It is formed using a sealant resin in which a tackifier is added to VA) or the like.

[0010]

In the manufacturing process of the lid material for a cup-shaped container according to the present invention, the laminated base material which is printed and primer-coated and wound on a roll has a constitution (upper side) printing layer / paper layer / adhesive layer / aluminum foil. Layer / Primer coat layer / Printing layer (lower side)
Since the aluminum foil layer is covered on the upper side with an adhesive layer and on the lower side with a primer coat layer, the aluminum foil layer does not retain the gas or moisture generated from the paper layer even when stored in a wound state. The aluminum foil layer is not oxidized, because it is hardly affected by. Then, the primer coating agent forming the primer coat layer has good adhesiveness to the aluminum foil, and the primer coat layer and the ink forming the printing layer have good adhesiveness,
Further, the primer coat layer and the printing layer are heat-sealed with the sealant resin forming the sealant layer. As a result,
The cup-shaped container using the lid material of the present invention does not peel off from the sealant layer during storage. Further, since the sealant resin used has oil resistance, it can be used for oily contents, and the primer coat layer has a thickness of 0.1 to 5 μm.
Since it is thin, and the layer thickness of the lid material is relatively thin and has an appropriate waist, it is a lid material for a cup-shaped container that is easy to open when opening the container.

[0011]

【Example】

<Embodiment 1> FIG. 1 is a cross-sectional view of a lid member of a cup container of this embodiment. The present embodiment will be described in detail with reference to this drawing.

First, a paper having a basis weight of 58 g / m ² and a thickness of 7
An aluminum foil having a thickness of μm is laminated by an extrusion lamination method using a polyethylene having a thickness of 15 μm as an adhesive layer, and (upper) paper layer (12) / polyethylene layer (13) (adhesive layer) / aluminum foil layer (14). A roll-shaped laminated base material having a constitution was produced. Next, with a gravure printing machine for multicolor printing, the paper layer (12) of this rolled-up laminated base material
A character or a pattern is printed on the surface with an ink made of a rubber-based resin, and an organic titanate-based primer coating agent (T-19, manufactured by Nippon Soda Co., Ltd.) is applied to the surface of the aluminum foil layer (14) for 1.5 to A 2.5 μm-thick primer coat layer (15) is formed, and characters and patterns are printed on the primer coat layer surface with a vinyl chloride-vinyl acetate copolymer-based ink (upper side) first printing layer (11). / Paper layer (12)
/ Polyethylene layer (13) / Aluminum foil layer (14)
/ Primer coat layer (15) / Second printing layer (16)
A laminated material having a (lower side) configuration was prepared, wound on a roll, and stored. After storage for one day, 25 μm as a sealant resin was applied to the lower print layer (16) surface of this roll-shaped laminated material.
Thick ethylene-ethyl acrylate (EEA) is laminated by the extrusion lamination method, and (upper) printing layer (11) / paper layer (12) / polyethylene layer (13).
(Adhesive layer) / Aluminum foil layer (14) / Primer coat layer (15) / Printing layer (16) / Sealant layer (1
7) A rolled-up laminated material having a (lower) configuration was produced, and the laminated material was punched out to a predetermined size to obtain a lid material (10) for a cup-shaped container of this example.

Next, in order to evaluate the lid material of this embodiment, a separately prepared cup-shaped container made of polystyrene was filled with instant noodles, and the lid material of this embodiment was heated at the mouth of this container by a heat sealing method. Melt and seal the vessel. And
After the normal storage and distribution period, the state of the lid material of this example of 1,000 cup-shaped containers was examined, and a container in which peeling occurred between the constituent layers of the lid material and the seal portion with the container. Was not confirmed at all. Also, the result of opening the container is
The lid had a moderate waist strength and was easy to open. The peel strength between layers of the lid material of this example was measured with a Tensilon tensile tester manufactured by Orient Tech Co., Ltd.
It was 15 mm wide. The peel strength between the layers of the lid material of the conventional example excluding the primer coat layer separately prepared for comparison is 1
The width was 20 g / 15 mm.

<Example 2> As a primer coating agent, a maleinized polyolefin (A manufactured by Dainippon Ink Mfg. Co., Ltd.) was used.
C-301) was used, and in the same manner as in Example 1,
A lid for the cup-shaped container of this example was produced.

Next, in order to evaluate the produced lid material of this embodiment, the lid material of this embodiment was heat-melted by the heat sealing method at the mouth of a polystyrene cup-shaped container filled with instant noodles. The container was sealed. After the normal storage and distribution period of the sealed cup-shaped container, the state of the lid material of this example of the cup-shaped container was examined in the same manner as in Example 1. No container was observed in which peeling had occurred at the seal part. As a result of opening the container, the lid material had an appropriate waist strength and was easy to open. The peel strength between layers of the lid material of this example was measured and found to be 290 g / 15 mm width.

<Example 3> As a primer coating agent, ethylene acrylic acid (AD-manufactured by Toyo Morton Co., Ltd.) was used.
37 FIB), but in the same manner as in Example 1,
A lid for the cup-shaped container of this example was produced.

Next, in order to evaluate the produced lid material of this embodiment, the lid material of this embodiment was heat-melted by the heat sealing method at the mouth of a polystyrene cup-shaped container filled with instant noodles. The container was sealed. After the normal storage and distribution period of the sealed cup-shaped container, the state of the lid material of this example of the cup-shaped container was examined in the same manner as in Example 1. No container was observed in which peeling had occurred at the seal part. As a result of opening the container, the lid material had an appropriate waist strength and was easy to open. The peel strength between layers of the lid material of this example was measured and found to be 300 g / 15 mm width.

[0018]

INDUSTRIAL APPLICABILITY The lid material for a cup-shaped container of the present invention is stored in a wound state in the manufacturing process because the aluminum foil layer is covered with the adhesive layer on the upper side and the primer coat layer on the lower side. However, the aluminum foil layer is hardly affected by the gas and moisture generated from the paper layer, and the aluminum foil layer is not oxidized. Further, the primer coat layer and the aluminum foil and the primer coat layer and the second printing layer have good adhesiveness, and the primer coat layer and the second printing layer are heat-meltable with the sealant resin forming the sealant layer. For wearing, the cup-shaped container using the lid material of the present invention does not peel off from the sealant layer during storage, and the sealant layer used has oil resistance and is also used for oily contents. In addition, since the layer thickness of the lid material is relatively thin and has a proper waist, it is easy to open when opening the container.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lid member for a cup-shaped container according to an example of the present invention.

FIG. 2 is a cross-sectional view of a lid member of a conventional cup-shaped container.

[Explanation of symbols]

 10, 20 ... lid material 11, 16, 21, 26 ... printing layer 12, 22 ... paper layer 13, 23 ... adhesive layer or polyethylene layer 14, 24 ... aluminum foil layer 15 ... primer coat layer 17 , 27 …… Sealant layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 15/12 B65D 43/00

Claims (2)

[Claims] 1. A first printed layer is provided on a paper layer surface of a laminated base material in which a paper layer, an adhesive layer and an aluminum foil layer are laminated in this order, a primer coat layer is provided on the aluminum foil layer surface, and the primer coat layer surface is provided on the primer coat layer surface. A second printing layer is provided, and this second
A lid material for a cup-shaped container, wherein a sealant layer is provided on the print layer surface of the above. 2. The primer coat layer according to claim 1,
A lid material for a cup-shaped container, which comprises one of organic titanate, maleated polyolefin, and ethylene acrylic acid.