JPH0531109Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a lid material, more specifically, it is suitable as a lid for a container filled with a liquid beverage such as a drink or a beverage containing lactic acid bacteria, which has a cup shape. This relates to the lid material.

(Prior Art) Conventionally, waterproof containers made of paper, plastic, glass, etc., filled with liquid beverages such as juice, have been widely produced and sold. As a lid for sealing the opening of such a container, a lid material is known in which a coating layer is adhered to one surface of a base material layer having a fluid outlet using an adhesive that is easily peeled off (in practical use). Publication No. 12726 (Sho 61-12726).

In the above-mentioned lid material, the coating layer becomes the outer surface and becomes the lid of the container, and in order to drink the contents, the coating layer is peeled off by pulling the tab formed at the end of the coating layer with your fingertips. . The base layer remains attached to the opening of the container, revealing a fluid outlet formed in the base layer through which the contents can be drunk.

(Problems to be solved by the invention) (a) The lid is usually printed with characters explaining the contents, how to open it, the name of the manufacturer, etc., and other designs as necessary. In the lid material described in the above publication, it is preferable to use a film or sheet made of plastic with excellent mechanical strength and other physical properties as the base layer, and an aluminum foil with excellent gas barrier properties as the covering layer. It is said that it is advisable to further cover the upper surface of this coating layer with a protective layer made of plastic, if necessary. The above characters and designs are printed on the surface of the protective layer made of plastic.
In order to industrially advantageously produce such lids, a wide and long plastic film is used as the protective layer, on which letters etc. are printed in pitch in correspondence with the positions to be punched into each lid. The base material layer is a wide and long plastic film with holes that serve as fluid outflow ports punched into each lid at corresponding locations on the lid. A long length of aluminum foil is laminated and bonded in a predetermined order so that the printing on the protective layer and the fluid outlet on the base material layer are in the appropriate positions, and each laminated seal is made from the resulting laminated seal. Punch out the lid. However, it is extremely difficult to ensure that the fluid outlet of the base layer and the printed portion of the cover layer overlap in the proper position and maintain their relative position during long continuous operations. .

(b) In the lidding material described in the above publication, the surface facing inside the container to be lidded is a base material layer made of plastic film or sheet as described above, and the top surface thereof is a coating layer made of aluminum foil. However, they are laminated and bonded using an adhesive that is relatively easy to peel off. Therefore, the inside of the container and the upper part of the lid are blocked by an aluminum foil with a high gas barrier property, but the fluid outlet provided in the base layer is separated by a peelable layer where the base layer and the coating layer are bonded. It comes into contact with the outside air through a layer of adhesive, and there is a risk that gas may flow through this route.

(Means for Solving the Problems) The purpose of the present invention is to provide a lid material that solves the above-mentioned problems. The lower surface (i.e., the surface facing the inner surface of the container when the container is covered) is layered with aluminum foil that has a high gas barrier property to block out gas. By printing on the material layer itself, it is easy to align the fluid outlet and the applied printing, and the upper surface of the printed base layer is covered with a transparent coating layer, and the printing is applied to the base material layer. Printing was achieved by making it clearly visible from the outside.

Hereinafter, the present invention will be explained in detail along with the explanation of the accompanying drawings.

FIG. 1 is a plan view of an example of the lid material of the present invention, FIG. 2 is a schematic vertical cross-sectional front view of a main part of an example of the lid material of the present invention, and FIG. 3 is an explanatory view showing the lid material of the present invention in an unsealed state.

In the figure, 1 is a base material layer constituting the lidding material of the present invention, 2 is an aluminum foil layer, and 3 is a sealing layer. , consisting of an adhesive with adhesive properties.
4 is an adhesive for bonding the base material layer 1 and the aluminum foil layer 2; 5 is laminated on the upper surface of the base material layer 1;
An easily peelable adhesive layer, 6 a transparent coating layer, and 7 a coating layer 6 laminated on the base layer 1 (more precisely, on the thin and easy adhesive layer 5 on the base layer 1). 8 is a fluid outlet provided in the base material layer 1;
10 is a notch provided at the base of the knob piece 9, 11 is a container, and 12 is an opening edge of the container.

The base layer 1 is a film made of plastic having excellent physical properties such as mechanical strength, such as polyester such as polyethylene terephthalate, polyolefins such as polyethylene (especially high-density polyethylene), polypropylene (especially stretched polypropylene), polystyrene, etc. or a seal is used, the thickness of which is usually 28-50μm (e.g. 38μm)
It is good to have something within the range of .

As the aluminum foil layer 2, an aluminum foil having a thickness of 7 to 30 μm (for example, 12 μm) is used.

The covering layer 6 has the purpose of protecting the outer surface of the lid material, and is made of a film made of plastic such as polyethylene terephthalate, polypropylene, polystyrene, etc., and has a thickness of 10 to 30 μm.
(for example, 16 μm) is preferable. In addition, this coating layer 6 needs to be transparent so that characters etc. printed on the base material layer 1 can be seen from the outside, as will be described later. As long as it is transparent, it may be colored.

The easily peelable adhesive layer denoted by the reference numeral 5 is such an adhesive layer that the coating layer 6 can be easily peeled off without applying a particularly strong force when the tab piece 9 is pinched with the fingertips and pulled in the direction of peeling the coating layer 6. This layer is made of a strong adhesive. Note that the adhesive strength must not be so weak that the coating layer 6 will peel off even if it is slightly rubbed during handling of the container product with the lid attached. Such adhesives are commercially available and can be selected from among them. Specifically, there are acrylic, polyester, and polyurethane adhesives. In order to make the adhesive relatively easy to peel off, an appropriate amount of a release agent such as silicone can be added to the adhesive component to reduce the adhesive strength to a desired degree.

The sealing layer 3 is made of an adhesive for bonding the lid of the present invention to the opening of the container, and specifically, a commercially available heat seal lacquer (for example, 8
g/ ^m2 ) A heat-sensitive polyethylene film adhesive (15 to 30 μm thick) was used, and a layer of ethylene-vinyl acetate copolymer was further laminated on top of the polyethylene film adhesive. things are also used. These are appropriately selected depending on the material of the container to be covered.

To illustrate the method of manufacturing the lid material of the present invention shown in FIG. 2, first, wide and long constituent layers are prepared. The base material layer 1 is pre-drilled with a large number of holes to serve as fluid outlet ports 8 at predetermined positions in the length direction and the width direction. Further, on the base material layer 1, explanations of the contents of the container, how to open the container, characters of the manufacturer's name, etc. are printed in advance. Further, as the adhesives indicated by numerals 4 and 7 in FIG. 2, film-like polyethylene heat-sensitive adhesives were used, and these were also prepared as wide and long belts with the same dimensions as the base material layer. do. Then, these are stacked as a whole or divided and stacked in the order shown in Fig. 2, and passed through a pressure roll.
Laminate by pressing under heat. To give an example of dividing, grouping, and laminating, a base material layer 1 and an easily peelable adhesive layer 5 are laminated, a covering layer 6 and an adhesive layer 7 are laminated, and the layer is pressed. The laminate is laminated by passing it through a roll, and then a laminate of a sealing layer 3, an aluminum foil layer 2, and an adhesive 4 is superimposed on this laminate, and being laminated by passing it through a pressure roll,
Finish.

In addition, instead of the above-mentioned film-like polyethylene heat-sensitive adhesive, a pressure-sensitive adhesive may be applied as the layers of adhesives 4 and 7 before being passed through a pressure roll, and then laminated by pressing with the roll. Good too.

Furthermore, immediately before the layers to be bonded are moved downward and passed through a pressure roll, adhesive in a heated molten state may be flowed down between the layers to be bonded to effect bonding.

As described above, when laminating is performed by pressing under heating, the coating layer 6 is coated with adhesive at the opening of the fluid outlet 8 provided in the base layer 1, as shown in FIG. It is bonded to the aluminum foil layer 2 via the aluminum foil layer 2.

As described above, explanatory text about the contents of the container and the like are directly printed on the base material layer 1. Since the fluid outlet 8 is perforated in the base material layer 1, the alignment of the fluid outlet 8 and the printed area such as letters is easily and accurately performed, and during the subsequent process until the completion of the lid material, There is no possibility of misalignment. Since the covering layer 6 is transparent, the printed content can be clearly seen from the outside.
Printing of characters, etc. on the base layer 1 can normally be done on the top surface of the base layer 1 (the side facing the outside of the lid), but if the base layer 1 is transparent, printing on the bottom surface thereof is sufficient. may be applied.

A lid is applied using the lid material of the present invention obtained as described above, and in order to open the lid, pinch the tab piece 9 with your fingertips and pull in the direction to peel off the coating layer 6.
The knob piece 9 is provided with a notch 10 at its base that reaches the easily peelable adhesive layer 5, and by pulling the knob piece 9, the coating layer 6 is removed.
and the layer of adhesive 7 is peeled off. When this peeling reaches the location where the fluid outlet 8 is provided, the hole of the fluid outlet 8 is filled with adhesive, so this adhesive is absorbed into the aluminum foil layer below it. 2 and the sealing layer 3 upward;
Tear this part apart and lift it up. That is, the state is as shown in FIG. In FIG. 3, reference numeral 13 indicates the adhesive in the hole portion of the fluid outlet 8, and the aluminum foil layer 2 and sealing layer 3 that have been adhered thereto and torn.

In this way, the container is left with a substrate layer 1 with an open fluid outlet 8 through which the contents of the container can be drunk.

(Effects of the invention) (a) A base material layer made of polyethylene terephthalate with excellent mechanical strength is used, a fluid outlet is provided in advance, and an aluminum foil with excellent gas barrier properties is used on this base material layer. With conventional lid materials, which are laminated using an adhesive that is easy to peel off, when adding printing such as a description of the contents of the container,
A plastic film with such printing is laminated onto the aluminum foil. When the printed plastic film layer and the base material layer having the fluid outlet are separate from each other in this way, when the whole is laminated, the position of the printed part and the fluid outlet must be in an appropriate relationship. However, when laminating work is carried out in an efficient continuous operation, misalignment is likely to occur between the two. In the lidding material of the present invention, the fluid outlet is perforated in the base material layer and the printing is applied to this layer, so that no misalignment occurs during continuous production operations.

(b) With the lid material of the present invention, when a container is covered with this lid material, the layer of aluminum foil, which has excellent gas barrier properties, is located below the base material layer, that is, at the position closest to the container. Therefore, gas barrier properties are utilized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of the lid material of the present invention, FIG. 2 is a schematic vertical cross-sectional front view of a main part of an example of the lid material of the present invention, and FIG. 3 is an explanatory view showing the lid material of the present invention in an unsealed state. In the figure, 1 is a base material layer, 2 is an aluminum foil layer, 3 is a sealing layer, 5 is an easily peelable adhesive layer, 6 is a coating layer, and 8 is a fluid outlet.

Claims (1)

[Scope of utility model registration request] An aluminum foil layer 2 is provided on one surface of the base material layer 1 having the fluid outlet 8, and further on this aluminum foil layer 2 is a seal that has adhesive properties to the opening edge of the container to be covered with the lid material. A layer 3 is laminated thereon, and an easily peelable adhesive layer 5 is laminated on the other side of the base layer 1, and a transparent coating layer 6 is laminated thereon with an adhesive. A lid material characterized in that, in the opening portion of the outlet 8, the covering layer 6 is adhered to the aluminum foil layer 2 via an adhesive.