JPH07232744A - Plastic container - Google Patents

Abstract

PURPOSE:To eliminate waste pollution problems, save resources, and reduce the cost by a method wherein when two sheets of a plastic film are affixed, a stripe-form unsealed part is formed on the periphery and space between the periphery, and at the same time, air is injected in the formed gaps to form a tray-form plastic container. CONSTITUTION:Two sheets of a plastic film are combined while leaving gaps which are designed by estimating an aimed shape. In the case of a tray 1, an unsealed part 2 is formed on the periphery in the longitudinal direction of the flat surface, and at the same time, unsealed parts 2a are formed with parallel intervals on an area inside of the periphery. By forming the unsealed parts 2a, gaps are formed inside, and air is injected from an air injection port 4 with a check valve into the gaps to expand them to constitute the tray 1. By forming the tray 1 using a plastic film, the amount of plastic is drastically reduced at the time of disposal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container that contributes to solving the problem of waste pollution and saving resources.

[0002]

2. Description of the Related Art In the case of plastic containers, there is an urgent need to eliminate waste pollution and develop products that contribute to resource saving. For example, in the case of trays such as PPC for storing fresh fish, meat, vegetables, etc., problems such as environmental problems due to waste, separation and collection of waste, and bulk of waste have been pointed out.

Also, in the case of a so-called bag which is a plastic container processed from a film, it has a feature such as a shape when the product is put in, a display effect, and does not fall down after opening, such as a gusset bag or a bottom. A so-called self-standing bag in which a boat is formed is used. However, in the case of this gusset bag or self-supporting bag, since the film itself needs to have a certain degree of elasticity, a so-called composite film (laminate film) obtained by bonding a plurality of films is generally used. Therefore, the cost becomes high and the problems of waste pollution and resource saving are pointed out as in the case of the tray.

[0004]

Recently, a paper-based tray has been proposed as an alternative to the above-mentioned known trays. However, compared with the PPC tray, the texture, display effect, appearance, and cost are improved. In reality, it is inferior in terms of the above and cannot be used as a substitute.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a plastic container (tray and self-standing bag) which solves the problem of waste pollution and contributes to resource saving and cost reduction. It is to propose.

[0006]

The constitution of the plastic container proposed in the present invention is as follows.

[0007] When two plastic films are bonded together, a streak-like unsealed portion is formed around the plastic film, and air is injected into the void formed by the unsealed area. , A plastic container formed by forming the whole into a tray shape.

2. When two plastic films are bonded together, a striped unsealed portion is formed in the horizontal and vertical directions, and the plastic film is used to make a bag. After bag making, the unsealed portion is formed. A plastic container made by forming a skeleton for self-standing in a bag by injecting air into the void.

It is to be noted that the injection work is facilitated by connecting the entire void and attaching a check valve to the air injection port communicating with the void.

As the two plastic films used in the above plastic container, a combination of polyolefin / polyolefin, polyolefin / polyester, stretched polypropylene and the like can be arbitrarily selected, and this combination is free. As the two plastic films, a composite film of films (including a film obtained by laminating aluminum foils) having their own characteristics may be used.

The two plastic films are formed into the same shape, and as a means for forming voids therein, a method of leaving a streak-like void using a heat seal bar and heat-sealing the other is used, or an adhesive is used. It is possible to adopt a method of bonding two plastic films together.

[0012]

FUNCTION The two plastic films are compounded leaving a void designed for the intended shape. In the case of a tray, this composite plastic film is cut into a size that forms the outline of the tray, and then air or liquid is injected into the void from the air inlet to form a void portion in a predetermined shape. Bulge and form a tray. When using a heat-foaming ink, before combining two plastic films, perform streak printing with the heat-foaming ink on the surface of either one of the two sheets, and print this printed surface inside After the two plastic films are combined with each other and cut along the contour of the tray, heat is applied to foam the heat-foaming ink to swell the portion printed in a streak shape, thereby forming a tray.

On the other hand, also in the case of a self-standing bag, a film for bag making is formed by leaving a void when two plastic films are combined, and the film is put on a bag making machine, for example, an envelope is stuck,
The bag is made while sticking the palms, and then air or liquid is injected from the air injection port, or heat is applied to foam the bag, forming a muscle for self-standing, and using this muscle as a skeleton. It is self-sustaining.

[0014]

1 and 2 show a tray according to the present invention, in which the tray 1 has an unsealed portion 2 formed on the periphery in the plane length direction and an unsealed portion 2a formed in parallel with the inside thereof. By forming it, the voids 3 and 3a are formed inside, and air is injected into the voids 3 and 3a from the air inlet 4 with the check valve 5 to inflate. In addition,
In the case of the embodiment, the surrounding voids 3 and the voids 3a therein communicate with each other, and when air is injected from the air inlet 4, the air is spread throughout the voids 3 and 3a.

The tray 1 of the embodiment has the above structure,
As shown in FIG. 2, as in the case of the conventional tray, for example, fresh fish a is placed in the tray 1 and wrapped with a wrap b for use.

FIG. 3 shows a self-supporting bag manufactured by sticking a palm together, and this self-supporting bag 10 is similar to the front 11 and back 12 sides when two plastic films are combined as shown in FIG. Inverted trapezoidal unsealed portions 13 and 13a are formed on the bottom of the bag and the unsealed portion of the bottom side 14 is formed on both sides 1 of the bag.
The air inlet 15 with a check valve is provided in a part of the extended unsealed portion 16 by linearly extending to the portion 0a. In the case of this self-standing bag 10 as well, the void 1 formed from the air inlet 15 by the unsealed portions 13, 13a, 16
When air is injected into 7, the unsealed parts 13, 1
3a and 16 parts swell to form a skeleton, and when an object is put in the bag and unfolded, the bottom part spreads out in a quadrangle shown in FIG. Prevent it from collapsing (falling over). Reference numeral 18 in the drawing is a portion corresponding to a so-called ear, and the ear 18 may be projected outward, but as shown by a dotted line in FIGS. You may stay.

In the embodiment, the unsealed portions (voids) are formed in the portions corresponding to the contour of the bottom of the bag and the four vertical corners, but the unsealed portions are formed only in the bottom portions to stabilize the bottom. The vertical shape may be retained by the contents contained in the bag, and the design of the unsealed portion (void) is arbitrary. Further, the order of injecting air into the unsealed portions 13, 13a, 16 may be after putting the object in the bag.

In the tray 1 and the self-supporting bag 10, when a streak-like skeleton is printed at a portion corresponding to an unsealed portion by using a heat-foaming ink, in the case of the tray 1, a film is placed in the heating chamber after being cut into a quadrangle. When put in, the ink thermally foams, and the foamed portion forms the corrugations inside and around the tray. On the other hand, in the case of a self-supporting bag, the skeleton as a self-supporting bag is formed by heating after bag making.

FIG. 6 shows a self-standing bag having a boat-shaped bottom, and this bag 20 has a skeleton formed by injecting air into unsealed streak-shaped voids 21 and 21a formed horizontally and vertically. For example, FIG. 7 is a self-standing bag with a bottom likewise formed in a boat shape. This bag 30 forms a skeleton by injecting air into the unsealed streak-shaped voids 31 and 31a formed horizontally and vertically. This is an example.

[0020]

As described above, according to the present invention, since the tray is formed by using the plastic film, the absolute amount of plastic at the time of disposal is greatly increased as compared with the case where the conventional foam material is used. It also reduces the amount of plastics used and solves the problem of waste pollution. In addition, the product form and appearance are better than those of paper trays.

Next, by carrying out the present invention on the self-standing bag, it is possible to form the self-supporting bag without using the expensive and expensive film material as in the conventional case. In this case as well, the problem of waste pollution can be solved and a saving can be achieved. It can contribute to resource and cost reduction. Also, by removing air, liquid, etc. from the void, the problem of bulk is solved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a tray embodying the present invention.

FIG. 2 is a sectional view taken along the line AA ′.

FIG. 3 is an explanatory view of a self-standing bag in which the present invention is implemented.

FIG. 4 is an explanatory view of a self-standing bag before putting things in.

FIG. 5 is an explanatory view of a self-supporting bag having a square bottom open.

FIG. 6 is an explanatory view of a self-standing bag having a boat-shaped bottom.

FIG. 7 is an explanatory view of a self-standing bag having a boat-shaped bottom.

[Explanation of symbols]

 1 Tray 2, 2a Unsealed part 3, 3a Air gap 4 Air injection port 5 Check valve a Fresh fish b Wrap 10 Freestanding bag 11 Table 12 Back 13, 13a, 16 Unsealed part 14 Bottom 15 Air injection port 17 Air gap 18 Ear 20 , 30 freestanding bags

Claims (6)

[Claims] 1. When two plastic films are attached to each other, a streak-like unsealed portion is formed in the periphery and in the middle of the periphery, and air is injected into the void formed by this unsealing. , A plastic container formed by forming the whole into a tray shape. 2. When two plastic films are stuck together, a striped unsealed portion is formed in the horizontal and vertical directions,
A plastic container formed by making a bag using this plastic film, and injecting air into the void formed by the unsealing after the bag is made to form a skeleton for self-standing in the bag. 3. The plastic container according to claim 1 or 2, wherein the entire void is communicated with, and a check valve is attached to an air injection port communicating with the void. 4. The plastic container according to claim 1, wherein the void is filled with a thermal foam. 5. The plastic container according to claim 4, wherein the thermal foam comprises a thermal foamable ink. 6. The plastic container according to claim 1, wherein the space is filled with a liquid.