JP2015189510A - Polyethylene bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyethylene bag which can be opened easily without using a special opening tool.SOLUTION: A polyethylene bag comprises a pair of facing flat surface parts 12, 13 and a pair of facing gusset-shaped side surface parts folded inside. In the pair of side surface parts, one side surface part is constituted by a first gusset part 15 and a second gusset part 16, and the other facing side surface part is constituted by a third gusset part 17 and a forth gusset part 18 arranged on a diagonal line with respect to the first gusset part. The width of the first gusset part 15 is formed wider by 2 mm or more than the width of the second gusset part 16, and the width of the third gusset part 17 is formed wider by 2 mm or more than the width of the forth gusset part 18.

Description

The present invention relates to a so-called plastic bag such as a business-use and household garbage bag or a shopping bag provided to a shopper at a supermarket or the like.

Conventionally, plastic bags used in supermarkets and retail stores are made of synthetic resin flakes such as polyethylene.
Generally, a pair of left and right handbags provided between the opposite upper end edges are provided on both the left and right ends of the upper end edge of the bottomed bag body opened upward.
The conventional plastic shopping bag is formed by cutting a cylindrical synthetic resin flake into a predetermined length in the length direction, then folding the left and right sides of the cylindrical synthetic resin flake inward, and intimately folding the inside into a folded sheet. To.
And a bottomed bag main body which obstruct | occluded the lower end edge by heat-sealing and comprised the gusset in the both right and left sides is formed. The upper part is cut out into a substantially rectangular shape at the central part to form a product entrance, and J-shaped edges are provided on the left and right sides.
Hand-held pieces, in which the J-shaped cut edge and the cut-out edge of the product entrance / exit are overlapped with each other by heat sealing, are arranged on the left and right.
A pair of left and right handbags are formed across the upper ends of the bottomed bag body by connecting the upper edges of the handbag pieces superposed on each other by heat sealing.
Since the synthetic resin thin bag provided with this gusset is heat-sealed, cut, etc., in the manufacturing process, the bag itself is in close contact with static electricity.

In addition, the roll-wrapped plastic bag installed in the cash register has a cylindrical synthetic resin flake folded into close contact with the sheet, and heat sealed and perforated at predetermined lengths in the length direction.
A bottom surface as a bag is formed by heat sealing, and the bag is cut from the roll winding shape by a perforation and used as one bag.
As with plastic bags, the rolled plastic bags themselves are also in close contact with each other due to static electricity and the like because the bag-like materials facing each other in the manufacturing process are heat-sealed and cut.

For this reason, it takes time to open the opening when an object is put into these plastic bags.

On the other hand, some proposals for facilitating the opening have been made, for example, by devising wet fingertips with a wet cloth or sponge.

Patent Documents 1 and 2 use an opening device, and Patent Documents 3, 4, and 5 have a function of easily opening the bag itself.

Patent Document 1 states, “By sandwiching the vicinity of the mouth of the plastic bag with this tongue, the adhesive force of the gel seal attached to the tongue and the force of returning to the original after the tongue is sandwiched, the mouth of the plastic bag can be simplified. Can be opened. ”

Patent Document 2 states that “the present invention is such that the other clip part that is extended from the ring-shaped part is always freely attached by another finger simply by inserting and attaching the finger to the ring-shaped part. Since it is formed so as to be sandwiched, the opening of the bag can be easily opened. "

Patent Document 3 describes that "the present invention can make the surface of the opening edge of the plastic bag uneven and provide a non-slip surface to make it difficult to slip, thereby avoiding difficulty during opening."

Patent Document 4 states, “A plastic bag with a device that makes it easy to open a bag opening that is difficult to open with a dry hand and has a 1 cm side + cut at the top and center of the plastic bag.” The present invention solves the problem of labor and hygiene. "

Patent Document 5 states that “a plastic bag characterized in that folded portions are formed on the front and back surfaces of a plastic bag such as a supermarket shopping bag or a garbage bag.” “Everyone can easily open by simply pulling on both sides.” Have been described.

In Patent Document 6, FIG. 1, FIG. 2, FIG. 3, and FIG. 4 showing a manufacturing method of a plastic bag inflation method are published.

Utility model registration No. 3165497 JP 2011-152922 A Utility Model Registration No. 3019199 Utility model registration No. 3112720 JP 2008-127100 A Utility model registration No. 3069642

However, the conventional method or the plastic bag has the following problems.
(A) Since cloths and sponges to wet the fingertips are used by an unspecified number of people, many people feel that they are unsanitary because miscellaneous bacteria may grow if they are not managed carefully.
(B) It is necessary to prepare equipment separately.
(C) When the fingertip is dry, it may be difficult to slide and open.
(D) There is one that folds the center part of the plastic bag and opens both sides of the bag by peeling apart the inner surfaces that are in close contact with each other due to static electricity. Since the openings are on the same axis and the opening direction is at a right angle to the pulling direction, sufficient opening cannot be promoted to the surface that is in close contact with static electricity.

The present invention has been made to solve the above-described problems, and provides a plastic bag that can easily open an opening without using a special opening device.

In order to solve the above problems, the present invention
A plastic bag comprising a pair of opposed flat portions and a pair of opposed gusset-shaped side portions folded inside,
In the pair of side surface portions, one side surface portion is constituted by a first town portion and a second town portion, and the other side surface portion facing each other is arranged diagonally with respect to the third town portion and the first town portion. It is composed of four town parts, the width of the first town part is 2 mm or more wider than the width of the second town part, and the width of the fourth town part is 2 mm or more wider than the third town part. And poly bag.

In addition, in the 1st town part and 2nd town part which comprise one side part, the one where a width | variety is wide is defined as a 1st town part.

Here, the “polybag” refers to a bag using a thin film made of a polymer such as vinyl chloride, polyethylene, or polyester.

Moreover, the plastic bag is used as a term including a plastic bag, a roll-wrapped plastic bag and a roll bag, which will be described later.

Further, “opening the opening” does not mean that the opening of the plastic bag is completely opened, but means that the surface adhered by static electricity is peeled off to make it easy to widen the opening.

As is clear from the above description, the following effects can be obtained in the present invention.

A plastic bag comprising a pair of opposed flat portions and a pair of opposed gusset-shaped side portions folded inside,
In the pair of side surface portions, one side surface portion is constituted by a first town portion and a second town portion, and the other side surface portion facing each other is arranged diagonally with respect to the third town portion and the first town portion. It consists of four towns.
By making the width of the first town part 2 mm or more wider than the width of the second town part and making the width of the fourth town part 2 mm or more wider than the third town part, the first town part and the first town part The four towns are picked up with the fingertips of both hands.
When picking and spreading it, both surfaces are peeled off by a force in the shearing direction acting on the contact surface of the flat part connected to the first town part and the flat part connected to the second town part due to static electricity. The opening of the plastic bag can be opened.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of a shopping bag 10 illustrating a first embodiment of a plastic bag of the present invention. FIG. 2 is an explanatory diagram of a method of opening the opening of the shopping bag 10 of FIG.
FIG. 3 is an explanatory view of a rolled plastic bag 100 illustrating a second embodiment of the plastic bag of the present invention.

[First embodiment]
The plastic bag 10 in FIG. 1 is made of a recycled polyester film formed into a cylindrical shape by an inflation method.

The fold portions 30 are formed at both ends of the recycled polyester film by folding the cylindrical recycled polyester film into a flat shape.
These crease portions 30 are each folded into a cylindrical inner side, and the inner side is brought into close contact with each other to form a folded sheet.

By folding, a side surface portion of the shopping bag 10 is formed, and a width as a side surface portion is set in a direction perpendicular to the crease portion 30.

At this time, the width of the first town part 15 constituting one side face part is set to be 2 mm or more wider than the width of the second town part 16 and the fourth town part 18 is formed from the third town part 17 constituting the other side face part. Increase the width by 2 mm or more.

The width of the formed side surface portion is the total value of the width of the first town portion 15 and the width of the second town portion 16.
Similarly, the total value of the width of the third town part 17 and the width of the fourth town part 18 is also the width of the other side part facing each other.

To summarize the above, the first town part 15 and the third town part 17 are connected to both ends of the plane part 12.
Similarly, the second town part 16 and the fourth town part 18 are connected to both ends of the plane part 13, the first town part 15 and the second town part 16 are connected, and the third town part 17 and the fourth town part are connected. The portion 18 is connected.

This is melted at a predetermined interval in the length direction parallel to the crease portions 30 at both ends and in a direction perpendicular to the crease portions 30, and then the both end edges are welded as a lower end portion 21 and an upper end portion 22.

Then, the upper end portion 22 is trimmed into a reverse concave shape to form the opening portion 20, the left and right hand-held portions 23, and the vertically long protruding side 25 at the center portion, thereby forming a plastic bag.

FIG. 1C shows a cross-sectional view along AA ′.
The figure shows the width of the first town part being 2 mm or more wider than the width of the second town part and the width of the fourth town part being 2 mm or more wider than the third town part.
Moreover, the cross section is shown by oblique lines.

Next, the opening method of the opening part of the shopping bag 10 will be described with reference to FIG.

FIGS. 2A and 2B are a perspective view and a cross-sectional view taken along the line A-A ′ in which the first and fourth town portions 15 and 18 of the shopping bag 10 are gripped with fingertips of both hands.

The arrows in both figures indicate the direction of the force that acts when pulling and unfolding the first town part 15 and the fourth town part 18 of the shopping bag 10 in the X direction and the -X direction.

By holding and pulling the first town part 15 in the −X direction and the fourth town part 18 in the X direction, the plane part 12 connected to the first town part 15 is pulled in the −X direction, and the fourth town The plane portion 13 connected to the portion 18 is pulled in the X direction.

At this time, the force acting on the flat surface portion 12 and the flat surface portion 13 is not on the same axis, and acts on the adhesion surface due to static electricity of the flat surface portion 12 and the flat surface portion 13 in the shear direction, thereby peeling the both surfaces to open the bag opening. Do.

[Second Embodiment]
Next, a second embodiment of the present invention will be described by way of example.

FIG. 3A is a perspective view illustrating a rolled plastic bag 100 of the present invention.

The rolled plastic bag 100 is made of a recycled polyester film formed into a continuous cylindrical shape by an inflation method.

A pair of opposing flat portions 12, 13 are formed by folding the cylindrical recycled polyester film into a flat shape.
And the crease | fold part 30 formed in the both ends of the plane part 12 is each folded in inside a cylindrical shape, and the inside is closely_contact | adhered and it is made into a two-fold sheet shape.

By folding, the side surface portion of the rolled plastic bag 100 is formed, and the width as the side surface portion is set in the fold line portion 30 in the vertical direction.

At this time, the width of the first town part 15 constituting one side face part is set to be 2 mm or more wider than the width of the second town part 16 and the fourth town part 18 is formed from the third town part 17 constituting the other side face part. Increase the width by 2 mm or more.

The width of the formed side surface portion is the total value of the width of the first town portion 15 and the width of the second town portion 16.
Similarly, the total value of the width of the third town part 17 and the width of the fourth town part 18 is also the width of the other side part facing each other.

To summarize the above, the first town part 15 and the third town part 17 are connected to both ends of the plane part 12.
Similarly, the second town part 16 and the fourth town part 18 are connected to both ends of the plane part 13, the first town part 15 and the second town part 16 are connected, and the third town part 17 and the fourth town part are connected. The portion 18 is connected.

In this state, while winding in a roll shape, welding is performed at a predetermined interval in the winding direction and in a direction perpendicular to the winding direction, and a subsequent dotted line 120 is inserted.

A bag bottom surface 110 is formed by welding, and is cut from the rolled plastic bag 100 by cutting along the dotted line 120 for cutting, and can be used as one plastic bag.

In addition, what was cut | disconnected from the roll wound plastic bag 100 and was made into one plastic bag is described as the "roll bag 200" below.

And the part of the cutting | disconnection dotted line 120 cut | disconnected from the roll wound plastic bag 100 becomes the opening part 20 of the roll bag 200 cut | disconnected from a roll wound plastic bag next.

FIG. 3B shows a B-B ′ cross-sectional view of the roll bag 200 in a state where it is cut off from the roll-wrapped plastic bag 100 by a cut-off dotted line 120.

In the figure, the width of the first town part 15 is 2 mm or more wider than the width of the second town part 16 and the width of the fourth town part 18 is 2 mm or more wider than the third town part 17.
Moreover, the cross section is shown by oblique lines.

Next, the opening method of the opening part of the said roll bag 200 is illustrated and demonstrated using FIG. 3 (B).

FIG. 3B is a cross-sectional view taken along the line B-B ′ in which the first town part 15 and the fourth town part 18 of the roll bag 200 are picked with the fingertips of both hands.

The arrows in both figures indicate the direction of the force acting when the first and fourth town portions 15 and 18 of the roll bag 200 are stretched out in the X direction and the -X direction.

By pulling and pulling the first town part 15 of the separated roll bag 200 in the −X direction and the fourth town part 18 in the X direction, the plane part 12 connected to the first town part 15 becomes −X The plane portion 13 pulled in the direction and connected to the fourth town portion 18 is pulled in the X direction.

At this time, the force acting on the flat surface portion 12 and the flat surface portion 13 is not on the same axis, and acts on the contact surface due to static electricity of the flat surface portion 12 and the flat surface portion 13 in the shear direction, thereby peeling both surfaces of the roll bag 200. An opening can be made.

In the first embodiment and the second embodiment, the parts suitable for picking up with a finger to promote the opening of the plastic bag are most effective in the vicinity of both sides of the opening part 20 of the first town part 15 and the fourth town part 18. Is.

Furthermore, in the first embodiment and the second embodiment, the difference between the width of the first town part and the width of the second town part, and the difference between the width of the third town part and the width of the fourth town part are 2 mm or more, respectively. If it is 15 mm or more, it is easier to pick when picking with a fingertip.

Further, the description procedure in [First Embodiment] [Second Embodiment] in “Best Mode for Carrying Out the Invention” does not necessarily indicate an actual manufacturing method.

Although the present invention has been described above with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and claims attached to the application of the present application by those skilled in the art or the like. Various changes and modifications can be made without departing from the scope.

These are the perspective views of the shopping bag which concerns on 1st embodiment of this invention. FIG. 3 is a front view of a state where a shopping bag is folded. FIG. 2 is an A-A ′ sectional view. These are the perspective views for demonstrating the opening method of the opening part of the shopping bag of FIG. These are explanatory drawings of the opening method using the AA 'cross section figure of FIG. These are perspective views explaining the roll wound plastic bag which concerns on 2nd embodiment of this invention. These are B-B 'sectional views of a roll bag.

DESCRIPTION OF SYMBOLS 10 Plastic bag 12 Plane part 13 Plane part 15 1st town part 16 2nd town part 17 3rd town part 18 4th town part 20 Opening part 21 Lower end part 22 Upper end part 23 Hand-carrying part 25 Vertically long side edge 30 Crease part 100 Rolled plastic bag 200 Rolled bag (Polybag separated from rolled plastic bag)

Claims (1)

A plastic bag comprising a pair of opposed flat portions and a pair of opposed gusset-shaped side portions folded inside,
In the pair of side surface portions, one side surface portion is constituted by a first town portion and a second town portion, and the other side surface portion facing each other is arranged diagonally with respect to the third town portion and the first town portion. It is composed of four town parts, the width of the first town part is 2 mm or more wider than the width of the second town part, and the width of the fourth town part is 2 mm or more wider than the third town part. And poly bag.