JP3075069B2 - Cover material for cup-shaped containers - Google Patents

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 non-food such as foods such as instant foods such as noodles and soups, prepared foods, frozen desserts and dairy products, and stationery.

[0002]

2. Description of the Related Art Conventionally, a sheet-like lid member made of a laminated base material mainly composed of paper and aluminum foil is used for forming a sheet of polystyrene or polypropylene by vacuum forming or pressure forming, or a cup formed by thin injection molding of polypropylene. Used in container-like containers. The configuration of this lid material was, for example, the configuration of the print layer / paper layer / adhesive layer / aluminum foil layer / print layer / sealant layer (lower) 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 display lottery for prizes on the lower side.
Note that the sealant layer is a layer formed of a resin that is thermally fused by a heat sealing method.

[0003]

However, when characters and pictures are printed on the upper and lower surfaces of a rolled laminated base material composed of a paper layer, an adhesive layer, and an aluminum foil layer, and then stored in a roll form, In some cases, the aluminum foil layer may be oxidized by gas (evaporation / sublimation components) or moisture generated from the paper layer. When a sealant layer was formed on the lower surface in a 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, a print layer / paper layer / adhesive layer / aluminum foil layer / polyethylene layer / print layer / sealant layer (lower) structure disclosed in Japanese Utility Model Laid-Open No. 4-83628 is disclosed. There is something. This is to prevent the aluminum foil layer from being oxidized by the gas and moisture generated from the paper layer when it is wound up and stored after printing, by covering the aluminum foil layer with a polyethylene layer. Since the lid material was inserted, the total thickness of the lid material was large and the stiffness was strong, and it was sometimes difficult to open when opening the container.

The present invention solves the above-mentioned conventional problems. The aluminum foil layer in the structure is oxidized by gas or moisture generated from the paper layer and does not peel off from the sealant layer during storage. In addition, the present invention provides a lid material for a cup-shaped container that can be easily opened when the container is opened.

[0005]

According to a first aspect of the present invention, as shown in FIG. 1, a paper layer of a laminated base material comprising a paper layer (12), an adhesive layer (13), and an aluminum foil layer (14). A first print layer (11) is provided on the 12) face, a primer coat layer (15) is provided on the aluminum foil layer (14) face, and a second print layer (16) is provided on the primer coat layer (15) face.
And a sealant layer (17) provided on the surface of the second printing layer (16).

According to a second aspect of the present invention, there is provided a cup according to the first aspect, wherein the primer coat layer (15) is made of any one of an organic titanate, a maleated polyolefin and an ethylene acrylic acid. It is a lid material (10) of the container.

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

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 print layer (16) formed on this primer coat layer is For printing, vinyl chloride-vinyl acetate copolymer type, nitrified cotton type, urethane type, nitrated cotton polyamide type,
Ink such as vinyl acrylic and nitrified cotton butyral is used. The printing of the first print layer (11) may use a general ink to be printed on paper.

The sealant layer (17) is made of ethylene-ethyl acrylate (EEA), ethylene-methacrylic acid cotrimer (EMAA), ethylene-vinyl acetate (E
It is formed using a sealant resin obtained by adding a tackifier to VA) or the like.

[0010]

In the manufacturing process of the lid material of the cup-shaped container according to the present invention, the laminated substrate printed and primer-coated and wound on a roll has a structure of (upper side) printed layer / paper layer / adhesive layer / aluminum foil. Layer / primer coat layer / print layer (lower side)
Since the aluminum foil layer is covered with an adhesive layer on the upper side and a primer coat layer on the lower side, even if the aluminum foil layer is stored in a rolled-up state, the aluminum foil layer does not emit gas or moisture generated from the paper layer. And the aluminum foil layer is not oxidized. And the primer coating agent forming the primer coating layer has good adhesion to the aluminum foil, and the primer coating layer and the ink forming the printing layer have good adhesion,
Further, the primer coat layer and the printing layer are thermally fused with a 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. In addition, since the sealant resin used has oil resistance, it can be used for oily contents. Further, the primer coat layer has a thickness of 0.1 to 5 μm.
Since the lid material is thin and the layer thickness of the lid material is relatively thin and has an appropriate stiffness, it is a lid material for a cup-shaped container that can be easily opened when the container is opened.

[0011]

【Example】

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

Next, in order to evaluate the lid material of the present embodiment, an instant noodle was filled in a separately prepared polystyrene cup-shaped container, and the lid material of the present embodiment was heat-sealed at the mouth of the container. The container was melted and sealed. And
After a normal storage / distribution period, the state of the lid of the present example of 1,000 cup-shaped containers was examined. Was not confirmed at all. Also, the result of opening the container is
The lid had moderate waist strength and was easy to open. In addition, when the peel strength between the layers of the lid material of the present example was measured with a Tensilon tensile tester manufactured by Orient Tech, it was 350 g /
It was 15 mm wide. For comparison, the peel strength between the layers of the lid material of the conventional example from which the separately prepared primer coat layer was removed was 1
The width was 20 g / 15 mm.

Example 2 A maleated polyolefin (A manufactured by Dainippon Ink and Chemicals, Inc.) was used as a primer coating agent.
C-301), except that C-301) was used.
A lid material for the cup-shaped container of this example was produced.

Next, in order to evaluate the produced lid material of the present embodiment, the lid material of the present embodiment was melted by heat sealing at the mouth of a polystyrene cup-shaped container filled with instant noodles. , The container was sealed. After a normal storage and distribution period of this sealed cup-shaped container, the state of the lid of the present example of the cup-shaped container was examined in the same manner as in Example 1. No container having peeled off at the seal portion was observed. Further, as a result of opening the container, the lid material had a moderate waist strength and was easily opened. When the peel strength between the layers of the lid material of the present example was measured, it was 290 g / 15 mm width.

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

Next, in order to evaluate the produced lid material of the present example, the lid material of the present example was heat-melted to the mouth of a polystyrene cup-shaped container filled with instant noodles by a heat sealing method. , The container was sealed. After a normal storage and distribution period of this sealed cup-shaped container, the state of the lid of the present example of the cup-shaped container was examined in the same manner as in Example 1. No container having peeled off at the seal portion was observed. Further, as a result of opening the container, the lid material had a moderate waist strength and was easily opened. In addition, when the peel strength between the layers of the lid material of this example was measured, it was 300 g / 15 mm width.

[0018]

The lid material of the cup-shaped container according to the present invention has the aluminum foil layer covered with the adhesive layer on the upper side and the primer coat layer on the lower side. Even so, the aluminum foil layer is very little affected by gas or moisture generated from the paper layer, and the aluminum foil layer is not oxidized. In addition, the primer coat layer and the aluminum foil, and the primer coat layer and the second print layer have good adhesiveness, and the primer coat layer and the second print layer are heat-sealed with the sealant resin forming the sealant layer. The cup-shaped container using the lid material of the present invention does not peel off from the sealant layer during storage, and the used sealant layer has oil resistance and is used for oily contents. In addition, since the thickness of the lid material is relatively thin and has a proper waist, it is easy to open the container when opening it.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lid of a cup-shaped container according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a lid material 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. ⁷ identification code FI B32B 15/12 B32B 15/12 B65D 43/00 B65D 43/00 (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 65/40 B32B 7/02 B32B 7/12 B32B 15/08 B32B 15/12 B65D 43/00

Claims (2)

(57) [Claims] 1. A first printing 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 Providing a second print layer,
3. A lid material for a cup-shaped container, wherein a sealant layer is provided on the surface of the printed layer. 2. The primer coat layer according to claim 1,
A lid material for a cup-shaped container, comprising any one of organic titanate, maleated polyolefin, and ethylene acrylic acid.