JPH11278497A - Synthetic resin bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin bag having openability and self-supporting property. SOLUTION: The bag 1 is made of a synthetic resin composed of a resin material containing calcium carbonate, and a folding section 2 having a predetermined width is provided on a side of a cylindrical film 1a having a predetermined length. And a longitudinal edge 3 is sealed so as to form the bottom of the bag, and an opening 4 is provided by forming a recess-shaped incision having such size as to include a part of the section 2 at the middle portion of the other longitudinal end of the film 1a. A loop-shaped grip 5 is formed on each of the opposite sides of the opening 4 by sealing the adjoining ends of the film 1a. A large number of irregular fold lines 6 are formed in the longitudinal direction on the inner surfaces of the film 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bag provided by a retail store such as a convenience store for storing goods purchased by customers, and more particularly to a synthetic resin bag excellent in opening property and independence.

[0002]

2. Description of the Related Art For example, in a retail store such as a supermarket or a convenience store, a polyethylene resin bag for a handbag provided by a store to store items purchased by a customer emits calories when incinerated. In order to reduce the amount of heat generated per unit during incineration, for example, in Tokyo and the like, a synthetic resin bag obtained by adding about 30% calcium carbonate to polyethylene is currently used as a standard for designating a garbage collection bag. When the bag is made by adding calcium carbonate, the inner surface becomes rough, so that the opening property can be improved as compared with the case of 100% polyethylene.

[0003] The structure of this synthetic resin bag is the same as that of a conventionally used polyethylene resin bag. A film formed in a cylindrical shape and wound in a coil shape is unwound and cut into a predetermined length. After being narrowed by folding in a predetermined width, both ends in the longitudinal direction are sealed by welding, and a central portion on one end side is cut out in a concave portion having a size including a part of the folding to form an opening, and both end portions on one end side are cut off. What is formed so that it may become a loop-shaped handle is generally used.

[0004]

The film constituting the synthetic resin bag formed as described above is extremely thin and is always kept in close contact with the film. Because of the lack of space, it took a long time to store things, which was extremely inefficient.

On the other hand, in a convenience store or the like, it is not preferable in terms of hygiene management since conventional foods such as lunch boxes can be opened by anyone simply by putting the food itself in a container and closing the lid. Sold wrapped in film.

However, it is said that this vinyl chloride resin film is also involved in the generation of dioxin during incineration. Recently, instead of the vinyl chloride resin as a wrapping material, an ethylene vinyl acetate copolymer resin has been used on both sides of polyethylene. Polyolefin resin films formed by lamination have been used.

However, when the lunch box packaged with the polyolefin resin film is heated by a microwave oven for a customer who requires a warm lunch, the ethylene-vinyl acetate copolymer resin in the outer layer thereof becomes tacky due to the heating. When stored in the synthetic resin bag due to the adhesiveness, it is particularly difficult to put the lunch box container in a horizontal state, and there has been a drawback that it is difficult to store the bento container more than other products.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a synthetic resin bag which can improve the opening property and the self-sustainability so as to easily store goods in order to solve the above-mentioned problems. In order to solve this problem, in addition to improving the openness by adding calcium carbonate to polyethylene as a material of the synthetic resin bag, the openability was further improved by providing uneven streaks on the inner surfaces facing each other. And easy insertion of sticky products.

That is, the bag with a handle is a bag made of a synthetic resin made of a resin material containing calcium carbonate, and has a folded portion having a predetermined width on a side portion of a cylindrical film having a predetermined length. One end in the direction is sealed so as to be a bottom, and the other end in the longitudinal direction is provided with an opening by a concave notch having a size including a part of the folding portion at a center portion and adjacent to the opening. Both end portions that match each other are formed into a loop-shaped handle by sealing, and a number of uneven streaks are formed on the inner surface of the film in the longitudinal direction. When the handle is a punched hole, the streaks can be formed in the same manner.

In this case, the ratio of calcium carbonate contained in the resin material is preferably about 10 to 30%.

The above synthetic resin bag is most suitable as a bag for storing a product wrapped in a wrapping material whose surface properties become tacky by heating.

This is particularly effective when the material of the wrapping material is a polyolefin resin film.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIGS. 1 and 2 show a synthetic resin bag according to the present invention with a loop-shaped handle. The material in this case is such that the content ratio of calcium carbonate to polyethylene is about 10 to 30%. In addition, as the content of calcium carbonate increases, the roughness of the surface of the synthetic resin bag increases.

The structure of the synthetic resin bag 1 (hereinafter abbreviated as bag 1) is such that a cylindrical film 1a having a predetermined length as shown in FIG. 1 is folded at a predetermined width as shown in FIG. There is a seal 2 indicated by a bold line so that one end edge 3 in the longitudinal direction is a bottom portion, and a concave portion having a size including a part of the folded portion 2 in a central portion is provided at the other end side in the longitudinal direction. An opening 4 is formed by cutting in a shape, and the opening 4 is formed.
Are formed so as to form a loop-shaped handle 5 by seals indicated by bold lines at both end portions.

Reference numeral 4a in the figure denotes ears which are left without being cut off when the opening 4 is cut, and when goods are stored in the bag 1, they are overlapped from both sides to provide evidence of purchase on the upper surface thereof. For stickers shown, or bag 1 for long ears
Used for closing.

A cylindrical film 1a used as a material of the bag 1
Although not shown, the gap between the circular die and the annular die externally fitted to the circular die is blown into a cylindrical shape by passing a mixture of polyethylene and calcium carbonate in a molten state according to a conventional method, and then cooled. When the bag 1 is manufactured, the tubular film 1a wound in a coil shape is rewound, cut into a predetermined length in the longitudinal direction, and then formed into a bag by the above-described procedure. You.

A large number of concave and convex streaks 6 in the longitudinal direction formed on the inner surface of the bag 1 are provided on the outer peripheral surface of the circular die in advance by providing a number of concave portions serving as streaks in the film. A large number of uneven streaks 6 are formed in the longitudinal direction on the inner surface of the film 1a having passed through the gap. As shown in FIG. 3 (A), the shape of the streaks 6 is, for example, a chevron having a pitch of 0.75 mm and a peak height of 0.
Those having a size of about 25 mm are used.

Other stitch shapes are indicated by 6a in the case of a triangle as shown in FIG. 3B and by 6b in the case of a semicircle as shown in FIG. 3C, but the pitch and height are shown in FIG. ) Is used.

By attaching such streaks 6, 6a and 6b, the bag 1 itself can be seated and self-sustaining at the time of opening can be obtained.
Since the goods come into contact with the tops of a and 6b and become slippery, storage becomes easy.

That is, for a product whose outer surface is wrapped with a wrapping material made of a polyolefin film, such as a lunch container, when the contents are heated by a microwave oven or the like together with the container to warm the contents, the surface of the wrapping material is Although the bag 1 according to the present invention is open and self-supporting even if it is a product that produces sticky tackiness due to heating, it is easy to store it in a flat state in the case of a lunch box. Can be done.

[0022]

Since the present invention is constructed as described above, the following effects can be obtained. 1) In addition to the bag made of resin containing calcium carbonate,
By providing the streaks on the inner surface of the bag, it is possible to eliminate the disadvantage that the inner surfaces of the bag are in close contact with each other at the time of opening and it is difficult to peel off the opening, and the opening becomes extremely easy. 2) In addition, since the streaks are provided on the inner surface of the bag, the independence is improved, so that a box such as a lunch container can be stored without unevenness at the bottom when storing. 3) In addition, even if the exterior has an adhesive property due to heating, it can be easily slipped due to the uneven streaks when stored in the bag, and can be easily stored.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment when the present invention is applied to a synthetic resin bag having a loop-shaped handle.

FIG. 2 is a sectional view taken along line AA of FIG.

FIGS. 3A and 3B are development views showing, in an enlarged manner, irregularities formed on the inner surface of the synthetic resin bag of FIG. 1, wherein FIG.
Is a triangular shape, and (C) is a sectional view in the case of a semicircular shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin bag (bag) 1a Film 2 Folding part 3 One edge 4 Opening 5 Handle 6,6a, 6b

Claims (5)

[Claims] 1. A bag made of a synthetic resin made of a resin material containing calcium carbonate, wherein a plurality of uneven streaks are formed on an inner surface from an opening at one end to a bottom at the other end. Plastic bag. 2. A bag made of a synthetic resin made of a resin material containing calcium carbonate, comprising a cylindrical film having a predetermined length and a folded portion having a predetermined width on a side portion thereof, and one end edge in a longitudinal direction being a bottom portion. At the other end in the longitudinal direction, an opening is provided at the center portion by a concave notch having a size including a part of the folded portion, and both end portions adjacent to the opening are sealed by a seal. A synthetic resin bag, which is formed so as to have a loop-like handle, and on the inner surface of the film, a number of uneven streaks are formed in a longitudinal direction. 3. The synthetic resin bag according to claim 1, wherein the proportion of calcium carbonate contained in the resin material is about 10 to 40%. 4. A bag made of a synthetic resin made of a resin material containing calcium carbonate, having a folded portion having a predetermined width on a side portion of a cylindrical film having a predetermined length, and one end edge in the longitudinal direction being a bottom portion. At the other end in the longitudinal direction, an opening is provided at the center portion by a concave notch having a size including a part of the folded portion, and both end portions adjacent to the opening are sealed by a seal. The film is formed to be a loop-shaped handle. On the inner surface of the film, a large number of uneven streaks are formed in the longitudinal direction, and the product is wrapped with a wrapping material whose surface property becomes tacky by heating. A synthetic resin bag, characterized in that: 5. The synthetic resin bag according to claim 4, wherein said wrapping material is a polyolefin resin film.