JPH0415478Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a material sheet for manufacturing lids, more specifically, suitable for containers filled with fluids such as juices and drinks containing lactic acid bacteria. This invention relates to a material sheet that can be used to efficiently manufacture lids.

(Prior art) Conventionally, a container made of waterproofed paper, plastic, glass, thick metal foil, etc. is filled with juice, a drink containing lactic acid bacteria, etc., and the opening is opened.
Types with lids made of waterproofed paper, paper covered with aluminum foil, plastic sheets, etc. are known.

In this case, the lid is glued to the upper edge of the opening of the container to seal the contents, and the adhesive used is that it can be easily removed by pinching and pulling the tab provided on the lid with your fingertips. A material with a certain degree of adhesive strength is used.

When drinking the contents from such a container with a lid, the opening of the container is completely opened, so when drinking in a moving car, for example, spillage may occur. Also, since the container and lid are separate, if the lid is opened and the container is thrown away, the environment will be harmed.

(Problems to be solved by the invention) The invention does not have the above-mentioned disadvantages, and when drinking,
It is an object of the present invention to provide a lid material sheet that can efficiently produce lids for fluid containers without spilling the contents or damaging the environment.

(Means for solving the problem) The main body of the present invention is a base material layer and a metal foil that are laminated and bonded, and this laminated layer is bonded with a relatively weak adhesive strength such that a part of the layer can be easily peeled off. , the other part is bonded with a strong adhesive strength that cannot be easily peeled off, and the base material layer in the easily peelable area has a large number of fluid outflow ports formed at intervals, or Score lines are provided at intervals on which fluid outflow ports can be easily formed, and as a result, it has been possible to obtain a sheet that can be efficiently punched and produced into a lid without the disadvantages of the conventional lid described above.

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

Figure 1 is a schematic plan view of an example of the sheet of the present invention;
The figures are a schematic vertical cross-section along the line of Figure 1 and Figure 3.
The figure is a schematic plan view of an example of a lid punched out from the sheet of the present invention, Figure 4 is a schematic vertical cross-sectional view taken along the line of Figure 3, and Figure 5 is a schematic diagram of the lid shown in Figures 3 and 4 when it is placed on a container. FIG. 2 is a schematic vertical cross-sectional front view of a portion of the upper edge of the container.

Note that these drawings are partially enlarged for ease of understanding, and the dimensional relationships between the parts are not properly proportional.

Lid material sheet 1 of the present invention shown in Figures 1 and 2
1 is a sheet extending in the left-right direction in FIG. 1 in the form of a band, with lids punched out in two rows, upper and lower. In FIG. 1, the two-dot chain line indicated by 14 is the line to be punched into the lid. As shown in FIG. 2, this sheet 1 has a cross section consisting of a metal foil 4, an adhesive layer 5, a base material layer 6, and an adhesive layer 7. The adhesive layer 5 is for bonding the metal foil 4 and the base material layer 6, and this adhesive layer 5 is further divided into two types, a layer indicated by 5a and a layer indicated by 5b, and the adhesive strength of the adhesive layer 5a is is such that the metal foil 4 can be easily peeled off from the base layer 6 by pinching and pulling with the fingertips, while the adhesive layer 5b has a stronger adhesive strength than the adhesive layer 5a, so that the metal foil 4 can be easily peeled off from the base layer 6 by pinching and pulling with the fingertips. It shall not be easily peeled off even if it is stretched. In this way, the band-shaped region shown in FIG. 1 and 2 is an easily peelable adhesive region, and the band-shaped region 3 is formed as a strong adhesive region that is difficult to peel off.

As the metal foil 4, aluminum foil, tin foil, etc. can be used, but aluminum foil is practical and preferable. The thickness is selected, for example, from the range of 7 to 50 μm, and when a protective film layer (for example, paper or plastic film is laminated) is provided on the metal foil (not shown), the thickness is within the above range. A thin inner layer is sufficient, and when no protective film layer is provided.
A thickness of 20μ or more is particularly preferable, and a thickness of about 30μ is preferable.

As the base material layer 6, a plastic film or sheet such as polystyrene, vinyl chloride resin, polyethylene, polypropylene, polyamide, polyester, or waterproof paper is used. The thickness is, for example, in the range of 12 to 200μ, preferably about 80μ.

For the adhesive layers 5, 5a, 5b, and 7, suitable adhesives are selected from among commercially available pressure-sensitive adhesives and heat-sensitive adhesives of various adhesive strengths. The adhesive layer 7 is for adhering the lid punched into a desired shape from the sheet of the present invention to the upper edge of the container opening, and the base layer 6 needs to be made so that it cannot be easily peeled off from the container opening. Therefore, one with a high adhesive strength is selected accordingly.

Reference numeral 8 shown in FIGS. 1 to 5 is a fluid outlet provided in the base layer 6 in advance. This fluid outlet 8
To explain, first, the sheet 1 of the present invention is punched out to make the lid 11 shown in FIGS. 3 and 4 (in FIG. 1, the disk shown by the two-dot chain line 14 is punched out).
The lid 11 is placed over the opening of the fluid-filled container as a lid. FIG. 5 shows a vertical section near the upper edge of the container opening in this state, and in the figure, 1
2 indicates a container, and 13 indicates an upper edge of the container. after that,
Before drinking the contents of the container, first remove the metal foil 4.
Peel off. When doing so, the fluid outlet 8 is exposed, from which the contents can be drunk. In addition,
For the fluid outlet, do not punch out the entire outlet in advance.
The base layer may have a peripheral edge corresponding to the fluid outlet, for example, a cut line such as a perforation. In such a case, when the metal foil is peeled off for drinking and this cut line is exposed, this part can be removed along the cut line and used as the fluid outlet 8.

In the figure, the reference numeral 9 is a grip piece used when peeling off the layer of metal foil 4.

Next, a method for manufacturing the sheet of the present invention will be illustrated. The adhesive layers 5 and 7 in the sheet of the present invention may be made of a pressure-sensitive adhesive or a heat-sensitive adhesive as described above, but it is preferable to use a film-like heat-sensitive adhesive for production efficiency. Above, preferred.
As such an adhesive, a film-like polyethylene heat-sensitive adhesive is preferable.

As mentioned above, it is efficient for the sheet of the present invention to continuously produce a long belt-shaped sheet (in Fig. 1, it extends long in both left and right directions), so a long sheet with the width of this belt-shaped Using a metal foil (e.g. aluminum foil), a base material layer (e.g. polystyrene sheet, polyvinyl chloride sheet), and the above-mentioned film-like pressure-sensitive adhesive, the whole is overlapped or divided into layers and passed through a pressure roll. Adhesive and laminate. For example, when passing through a pressure roll, first a first group is laminated using a combination of a metal foil and a film-like heat-sensitive adhesive, and a second group is laminated separately using a combination of a base material layer and a film-like heat-sensitive adhesive. (In this second group, punching is performed to form a fluid outlet only in the base material layer before lamination adhesion, or punching is performed to form a fluid outlet in the laminate of the base material layer and a film adhesive.) ),
Thereafter, the first group of laminates and the second group of laminates are stacked and passed through a press roll to obtain a four-layer laminated material sheet of the present invention.

Also, all of the above four layers are stacked and passed through a pressure roll,
It may be made into a material sheet of the present invention all at once.

Note that in the above manufacturing method, the metal foil 4 and the adhesive layer 5
When a first group of laminates with the base material layer 6 and a second group of laminates with the adhesive layer 7 are made, and the first and second groups are overlapped and passed through a pressure roll, only the base material layer 6 is formed. When the fluid outlet 8 is punched out in advance, the fluid outlet 8 is punched out in the adhesive layer 7.
The adhesive layer 7 is also present in the area corresponding to 4.
When the layers are laminated, the adhesive layer 7 is directly laminated on the upper adhesive layer 5 at the location corresponding to the fluid outlet 8. In this case, as will be described later, the lid 11 is formed by punching and used as a lid for the container, and when the metal foil 4 is peeled off from the base layer 6 in order to drain the contents of the container, the adhesive layer 5 is bonded to the metal foil 4. Well, when it is peeled off, at the same time, the adhesive layer 7 that is adhered to the adhesive layer 5 at the fluid outlet 8 is also peeled off, creating a fluid outlet and allowing the filling in the container to flow out. I can do it. In addition, as the sheet manufacturing method of the present invention, even when the four layers of metal foil 4, adhesive layer 5, base material layer 6, and adhesive layer 7 are stacked together and passed through a pressure roll to produce a laminate at once, When the fluid outlet 8 is punched and formed in the base material layer 6 in advance, the adhesive layer 5 and the adhesive layer 7 are directly adhesively laminated at the location corresponding to the fluid outlet 8 to form the lid 11 as described above. Fluid outflow can be effected in a similar manner.

In order to form the adhesive layer 5a that is easy to peel and the adhesive layer 5b that is difficult to peel in the adhesive layer 5, film-like heat-sensitive adhesives having different adhesive strengths are manipulated so that they are at predetermined positions and passed through the pressure roll. Alternatively, an easily peelable film-like heat-sensitive adhesive may be applied to the entire lower surface of the metal foil 5, and a predetermined width may be applied to the lower surface (in the case of the one shown in FIGS. 1 and 2, the lower surface of the center part). They may be passed through a pressure roll in such a way that they are overlapped with a narrow band of film-like heat-sensitive adhesive that is difficult to peel off.

When using a pressure-sensitive adhesive, it is applied to the lower surface of the metal foil and the lower surface of the base material layer with a rotating roll before being passed through the pressure roll, and then passed through the pressure roll. In this case as well, adhesives suitable for each are selected and used so that an easily peelable adhesive layer 5a and a hard to peel adhesive layer 5b are coated. Preferably, a release paper is laminated on the lower surface of the adhesive layer 7.

The sheets of the present invention shown in Figures 1 and 2 have lids punched out in two rows in the length direction, but the sheets of the present invention have lids punched out in one row or three or more rows in the length direction. The base sheet can also be manufactured according to the method described above.

In order to manufacture a lid from the base sheet of the present invention obtained as described above, in the case of the one shown in FIG. The lid shown in is obtained. In order to use this lid as a lid for a container, the adhesive layer 7 of the lid may be placed against the opening of the container and pressed or heated.

The lid shown in FIGS. 3 and 4 shows an example in which the knob piece 9 protrudes from the disk of the lid, but in this case, a notch as shown at 15 in FIG. 5 is added. If you do so, when you pull the knob piece 9, the metal foil 4
layer can be easily peeled off.

In addition, when punching out holes in the base material layer 6 in advance at the positions corresponding to the knob pieces 9, the parts of the knob pieces 9 in FIG. By pulling this part, the metal layer can be easily peeled off.

In addition, instead of providing a tab piece protruding from the disc of the lid as described above, a release agent may be applied to the lower surface of the adhesive layer 5 in one or more places near the location where the tab piece is installed as shown in the figure, for example, in a half-moon shape. When applied, a non-adhesive part is formed between the metal foil and the base material layer 6, so that the metal foil can be peeled off by inserting a fingertip into this part.

When the above-mentioned lid is used on the opening of the container filled with juice, etc. as described above, and the lid is closed as shown in Fig. 5, the contents are completely sealed. When the metal foil 4 is pulled by pinching the metal foil 4 between the fingertips (or by inserting the fingertips into the non-adhesive portion provided instead), the easily peelable adhesive area 2 is easily peeled off, and no further peeling is possible. This separation reveals a fluid outlet 8 from which the contents can flow out. For example, if a pressure-sensitive adhesive is used in the adhesive area 2, when the contents are half emptied and the peeled metal foil is returned to its original position, the residual slight adhesive force will cause the fluid to evaporate. The outlet is also covered, which is extremely desirable from a sanitary standpoint.

The lidded container can be used not only for liquids such as juice, but also for containers filled with powdered or fine-grained seasonings, spices, furikake, etc.
In such a case, a plurality of relatively small holes may be formed as the fluid outlet.

The typical examples of the sheets of the present invention have been explained above.
The present invention is not limited to those described above. For example, in the case shown in FIG. 1, the lids are punched out in two rows in the length direction, but the lids may be punched out in one row or three or more rows in the length direction.
Further, letters and designs may be printed on the metal foil as appropriate, or a plastic film, paper, etc. may be pasted on the metal foil and printed on these. The shape of the lid to be punched out is not limited to a circular shape, but may be any polygonal shape. Furthermore, in order to improve the adhesion of the surface of the metal foil 4 in contact with the adhesive layer 5, it may be chemically treated such as oxidation treatment, corrosion treatment with chemicals, or physically treated to form fine irregularities on the surface. More preferred.

(Effects of the invention) (a) By simply punching out the sheet of the present invention, it is possible to easily obtain an extremely useful lid for a fluid-filled container as described below.

(b) The lid obtained from the sheet of the present invention has a metal foil laminated on the base layer, and the metal foil prevents air from flowing, so that the container contents have good storage stability.

(c) The metal foil can be easily peeled off from the base material layer, and this peeling creates an easy-to-drink outlet when the contents of the container are juice, etc., and when exposed to vibrations such as in a car. You can drink it without spilling it.

(d) In the laminated adhesion between the base material layer and the metal foil layer, the container lid punched from the sheet of the present invention is divided into an area where the metal foil is easily peeled off and an area where it is difficult to peel off. The part where the fluid outlet is provided is in an area where it is easy to peel off, so there is no problem with fluid outflow, but in areas where it is difficult to peel off, the metal foil is not separated from the base layer, so the lid is scattered and harms the environment. Never. Furthermore, when the contents of the container are not poured out all at once but rather are poured out in parts, when the peeled metal foil is replaced, the lid is closed by the adhesive force of the remaining adhesive, which is preferable from a hygienic point of view.

(e) Since the base material layer with the fluid outlet is covered with metal foil until use, the base material layer is not contaminated with dust or germs.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of an example of the sheet of the present invention;
The figures are a schematic vertical cross-section along the line of Figure 1 and Figure 3.
The figure is a schematic plan view of an example of a lid punched from the sheet of the present invention, Figure 4 is a schematic vertical cross-sectional view taken along the line of Figure 3, and Figure 5 is a container when the lid shown in Figures 3 and 4 is placed over the container. FIG. 2 is a schematic vertical cross-sectional front view of a portion of the upper edge. In the figure, 2 is an area where the metal foil is easy to peel, 3 is a strong adhesive area where the metal foil is difficult to peel, 4 is the metal foil, 5 is the adhesive layer, 6 is the base layer, 7 is the adhesive layer, and 8 is the fluid flow. 11 is a lid, and 12 is a container.

Claims (1)

[Scope of utility model registration request] The sheet is divided into a strong adhesive region 3 and an easily peelable adhesive region 2 when viewed in plan, and when viewed in a cross section perpendicular to the sheet surface, a metal foil layer 4, an adhesive layer 5, a base material layer 6, and The adhesive layer 5 is laminated in the order of the adhesive layer 7, and in the adhesive layer 5, the adhesive force of the adhesive layer 5b in the strong adhesive area 3 is greater than the adhesive force of the adhesive layer 5a in the easily peelable adhesive area 2, Further, in the base material layer 6 in the above-mentioned easily peelable region 2, a large number of fluid outlet ports 8 or cut lines that can become fluid outlet ports 8 are provided parallel to the strong adhesive region 3 and spaced at predetermined intervals. Material sheet for the lid.