JP7166688B1 - zipper packaging bag - Google Patents

Abstract

A zipper packaging bag is provided that is opened during heating so that an internal fluid can smoothly flow out to the outside. A zipper packaging bag (1) of this embodiment includes a bag body (2) for containing contents, and a zipper mechanism (3) provided on the inner surface of the bag body (2) adjacent to an opening (21). At least part of 3 is made of a shape memory resin, and when the temperature rises to a predetermined temperature or higher, the opening 21 is opened by receiving the internal pressure of the bag 2 . Therefore, the opening 21 is opened by the chuck mechanism 3 during heating, and the internal fluid (gas) can be smoothly discharged to the outside. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a zipper packaging bag using a shape memory resin for the zipper portion.

Conventionally, zipper packaging bags have been proposed in which a zipper made of synthetic resin is attached to the bag so that the bag can be resealed by the zipper after it has been opened. Such a zipper packaging bag can be resealed and resealed, and has excellent airtightness.

For example, Patent Literature 1 discloses a zipper pouch (P) in which the zipper (10) is made of a linear resin having shape memory properties. It is said that the zippered pouch of this patent document 1 keeps the opening of the pouch open, so that the contents can be easily taken out.

JP 2008-222287 A

By the way, in recent years, contents such as retort food have been put into zipper packaging bags. In such a case, if the zipper packaging bag is heated in a microwave oven, the bag body may expand due to the internal pressure and burst and scatter.

However, the current zipper package including the zipper pouch of Patent Document 1 is not intended to be heated as it is, and the internal fluid does not smoothly flow out to the outside by being opened during heating. not Although there are some examples in which a valve is provided in the bag body, the structure becomes complicated when the valve is provided, and the airtightness is also deteriorated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a zipper packaging bag that is opened during heating so that the internal fluid can smoothly flow out to the outside.

In order to achieve the above object, a chuck packaging bag of the present invention comprises a bag body for containing contents, and a chuck mechanism provided on the inner surface of the bag body adjacent to an opening, wherein the chuck mechanism is made of a shape memory resin, and when the temperature rises to a predetermined temperature or higher, the opening is opened by receiving the internal pressure of the bag.

As described above, the zipper packaging bag of the present invention includes a bag body for containing contents, and a zipper mechanism provided on the inner surface adjacent to the opening of the bag body. It is made of a memory resin, and when the temperature rises above a predetermined temperature, the internal pressure of the bag body causes the opening to be opened. Therefore, during heating, the opening is opened by the chuck mechanism so that the internal fluid (gas) can be smoothly discharged to the outside.

It is a perspective view of the whole zipper packaging bag. It is a cross-sectional view of the entire zipper packaging bag. 4 is an enlarged cross-sectional view of the chuck mechanism at room temperature; FIG. 4 is an enlarged cross-sectional view of the chuck mechanism during heating; FIG. 4 is an enlarged cross-sectional view of the chuck mechanism at high temperature; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the constituent elements described in the following examples are examples, and are not intended to limit the technical scope of the present invention only to them.

(overall structure)
First, referring to FIG. 1, the overall configuration of a zipper packaging bag 1 of the present invention will be described. The zipper packaging bag 1 of the present invention is a so-called freezer bag, as shown in FIG. 3 and .

The bag body 2 is, for example, formed into a bag shape from a laminated film composed of nylon (polyamide synthetic resin) on the outer surface and (high-density) polyethylene resin on the inner surface. Specifically, the bag body 2 is composed of a front portion 20a, a back portion 20b, side portions 20c and 20c, and a bottom portion 20d. A chuck mechanism 3, which will be described later, is adhered to the inner surfaces of the front portion 20a and the rear portion 20b.

A chuck mechanism 3 is provided on the inner surface of the bag body 2 adjacent to the opening 21, that is, the inner surface of the front portion 20a and the inner surface of the rear portion 20b. At least part of the chuck mechanism 3 is made of shape memory resin, and when the temperature rises above a predetermined temperature, the internal pressure of the bag body 2 is received and the opening 21 is opened.

Contents such as food are sealed inside the bag 2 in a sealed state (which may be in a vacuum state) in the product manufacturing process. That is, the bag 2 is filled with contents through the opening 21 and sealed by the chuck mechanism 3 . It is also preferable to further provide a welding portion (sealing portion) or the like outside the chuck mechanism 3.

(Configuration of chuck mechanism)
Next, the configuration of the zipper mechanism 3 of the zipper packaging bag 1 of this embodiment will be described with reference to FIGS. 2-3. In addition, FIG. 2 exaggerates the chuck mechanism 3 and draws it larger than it actually is. The chuck mechanism 3 is composed of a female claw 4 made of polyolefin resin and a male claw 5 made of shape-memory resin. there is Here, a case where the female claw 4 is attached to the front portion 20a and the male claw 5 is attached to the back portion 20b will be described as an example, but the correspondence may be reversed.

The female claw 4 is obtained by extruding a polyolefin resin such as (high density) polyethylene or polypropylene. That is, since the cross-sectional shape required for the female claw 4 is severe, it is molded from a polyolefin resin. This high density polyethylene can be used from -30°C to +110°C. In other words, the female claw 4 maintains its rigidity up to a higher temperature range than the male claw 5, which will be described later.

Specifically, the female claw 4 includes a plate-like base 40 attached to the bag body 2, a first piece 41 rising from the base 40, and similarly extending from the base 40 so as to face the first piece 41. and a second piece 42 that rises, and has a C shape that opens toward the male claw 5 as a whole.

That is, in the female claw 4, a first claw 41 curved to one side (right side in the figure) from the base and a second claw 42 curved to the other side (left side in the figure) from the base extend so as to face each other. A space with a circular cross section is formed as an area surrounded by both.

On the other hand, the male claw 5 is obtained by co-extrusion molding a shape memory resin such as a polylactic acid resin and a polyethylene resin as a sealing layer. That is, the joint surface of the male claw 5 with the bag body 2 is made of polyethylene resin, which is a heat seal layer. This polylactic acid resin softens into a rubbery state at 80° C. or higher. In addition, the shape memory resin is not limited to polylactic acid resin, for example,

Specifically, the male claw 5 includes a plate-shaped base 50 arranged on the bag body 2 side, a neck portion 52 extending from the base 50, and a circular portion (circular cross-sectional portion) formed on the tip side of the neck portion 52. ) 51. That is, the male claw 5 has a circular portion 51 having a circular cross section on the distal end side, and a neck portion 52 connecting the circular portion 51 and the base 50 and having a narrower diameter than the circular cross section on the proximal end side.

In addition, the neck portion 52 of the male claw 5 of this embodiment is provided with a concave portion 53 whose cross section is notched on the side surface facing the outside of the bag body 2 . That is, in the neck portion 52 of the male claw 5, the cross section of the base of the circular portion 51 on the side facing the opening edge is missing. That is, the neck portion 52 is tapered (outwardly facing surface) at the location where it connects to the circular portion 51 .

When the product is shipped, the chuck mechanism 3 is in a fitted state as shown in FIG. That is, the circular portion 51 on the distal end side of the male claw 5 is held by the left and right first claws 41 and second claws 42 of the female claw 4 . In other words, the male claw 5 is fitted in a circular (cross-sectional) space formed by the female claws 41 and 42 that are open in a C-shape.

Therefore, it resists the force that separates the female claw 4 and the male claw 5 from each other. That is, by hooking the circular portion 51 of the male claw 5 near the curved ends of the first piece 41 and the second piece 42 of the female claw 4, the two are kept from separating.

(Action of Chuck Mechanism)
Next, the operation of the zipper mechanism 3 of the zipper packaging bag 1 of this embodiment will be described with reference to FIGS. 3 to 5. FIG.

At room temperature, the chuck mechanism 3 is in a fitted state as shown in FIG. That is, the circular portion 51 of the male claw 5 is held by the first piece 41 and the second piece 42 of the female claw 4 . That is, the circular portion 51 of the male claw 5 is hooked by the first piece 41 and the second piece 42 of the female claw 4 .

During heating, as shown in FIG. 4, the chuck mechanism 3 is released from the fitted state. When the bag 2 is heated, water vapor or the like is generated from the food or the like inside, thereby increasing the pressure inside the bag 2 and increasing the volume inside the bag 2 . Then, as shown in the figure, a force acts to open the chuck mechanism 3 .

At the same time, the temperature inside the bag body 2 rises due to the heating. After that, when the temperature reaches a predetermined temperature (for example, 80° C.), the male claw 5 softens and becomes easy to deform. As a result, these interactions release the chuck mechanism 3 .

Specifically, the male claw 5 deforms so as to fall to the outside where the concave portion 53 is provided. On the other hand, the second piece 42 of the female claw 4 is separated from the circular portion 51 of the male claw 5 . Finally, the circular portion 51 of the male claw 5 escapes from the space defined by the first piece 41 and the second piece 42 of the female claw 4 .

When the temperature is high after that, as shown in FIG. 5, the chuck mechanism 3 is in a disengaged state, and the opening 21 of the bag body 2 is opened. Therefore, the fluid inside the bag body 2 is smoothly discharged to the outside through the opening 21, so that the internal pressure is lowered.

Then, when the temperature drops below the predetermined temperature after a lapse of time, the male claw 5 hardens again, so that the male claw 5 is fitted again with the female claw 4 and the opening 21 can be sealed again. That is, when the internal pressure of the bag body 2 is released, the female claw 4 and the male claw 5 come to face each other.

(effect)
Next, the effects of the zipper packaging bag 1 of the present embodiment will be listed and explained.

(1) As described above, the zipper packaging bag 1 of the present embodiment includes the bag body 2 for containing the contents, the zipper mechanism 3 provided on the inner surface of the bag body 2 adjacent to the opening 21, At least part of the chuck mechanism 3 is made of shape memory resin, and when the temperature rises above a predetermined temperature, the opening 21 is opened by receiving the internal pressure of the bag body 2 . Therefore, the opening 21 is opened by the chuck mechanism 3 during heating, and the internal fluid (gas) can be smoothly discharged to the outside. Here, the predetermined temperature is not limited, but may be 80°C, for example.

That is, the zipper packaging bag 1 of the present embodiment has a zipper fitting capability from a low temperature state to a room temperature state, but when the conditions of a temperature of 80° C. or higher and a standard pressure in the bag body 2 of a reference pressure or higher are satisfied. loses the ability to fit into the chuck and discharges the internal fluid to the outside. Therefore, even if it heats with a microwave oven etc., it can prevent that the bag 2 expands and bursts.

After the chuck mechanism 3 is released, the high-temperature gas (atmosphere) is discharged to the outside and the temperature drops to near room temperature. It will return to its original hardness and shape. That is, the male claw 5 comes to have a normal chuck fitting function again. Thus, the zipper packaging bag 1 having the zipper mechanism 3 of this embodiment can be reused.

(2) The chuck mechanism 3 is composed of a female claw 4 made of polyolefin resin and a male claw 5 made of polylactic acid resin as a shape-memory resin. is softening. In this way, by molding the female claw 4 with an olefin resin, the necessary molding accuracy and rigidity in a high temperature range are imparted, and by molding the male claw 5 with a shape memory resin, it softens in a high temperature region. It can be made to have deformation performance.

(3) Furthermore, the male claw 5 is composed of a circular portion 51 and a neck portion 52 connected to the circular portion 51, and the female claw 4 is formed in a C shape that fits into the circular portion 51. . With such a shape, the female claw 4 and the male claw 5 can be easily fitted from the front (opposing state), and can be easily disengaged when the male claw 5 is rotated (bent).

(4) Moreover, it is preferable that the male claws 5 are bent outward from the bag body 2 from the direction toward the female claws 4 when the bag body 2 receives internal pressure and expands. In this way, if the male claws 5 are made to bend under the internal pressure of the bag 2, the male claws 5 fall outward due to the action of the internal fluid that expands in the high temperature range, so that the engagement with the female claws 4 becomes impossible. easier to come off.

(5) Specifically, it is preferable that the neck portion 52 of the male claw 5 at a position close to the circular portion 51 is provided with a concave portion 53 having a cross section facing the outside of the bag body 2 that is notched. . Then, when the second piece 42 inside the female claw 4 is moved (bent or swung) away, the entire male claw 5 is more likely to fall to the outside where the recess 53 is located.

Furthermore, by providing the concave portion 53 in this way, when the male claw 5 and the female claw 4 slightly move in the direction in which they separate, the male claw 5 begins to tilt (tilt) little by little. It becomes difficult to receive a force (such as scratching) from the piece 42 side. That is, the escape action is accelerated.

(6) When the temperature drops below the predetermined temperature, the male claws 5 of the chuck mechanism 3 are hardened again, so that the male claws 5 are refitted with the female claws 4 and the opening 21 can be sealed again. That is, when the internal pressure of the bag body 2 is released, the female claw 4 and the male claw 5 come to face each other. That is, the zipper packaging bag 1 can be easily reused, and is excellent in airtightness when reused.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent that they do not depart from the gist of the present invention can be applied to the present invention. included.

1 zipper packaging bag 2 bag body 21 opening 3 chuck mechanism 4 female claw 40 base 41 first piece 42 second piece 5 male claw 50 base 51 circular portion 52 neck portion 53 concave portion

Claims (4)

a bag containing contents;
a chuck mechanism provided on the inner surface adjacent to the opening of the bag,
At least a part of the chuck mechanism is made of shape memory resin, and when the temperature rises above a predetermined temperature, the inner pressure of the bag body causes the opening to be opened.cage,
The chuck mechanism is composed of a female claw made of polyolefin resin and a male claw made of polylactic acid resin as the shape memory resin. become ,
The male claw is formed so as to bend outward from the bag body from a direction toward the female claw when the bag body receives internal pressure and expands. zipper packing bag. a bag containing contents;
a chuck mechanism provided on the inner surface adjacent to the opening of the bag,
At least a part of the chuck mechanism is made of shape memory resin, and when the temperature rises above a predetermined temperature, the inner pressure of the bag body causes the opening to be opened.cage,
The chuck mechanism is composed of a female claw made of polyolefin resin and a male claw made of polylactic acid resin as the shape memory resin. and
The male claw is composed of a circular portion and a neck portion connected to the circular portion, and the female claw is formed in a C shape that fits into the circular portion,
The male claw is formed so as to bend outward from the bag body from a direction toward the female claw when the bag body receives internal pressure and expands. zipper packing bag. Claim 1 or Claim 2 , wherein the neck portion of the male claw at a position close to the circular portion is provided with a recessed portion having a cross section facing the outside of the bag body. zipper packing bag. 1. The chuck mechanism is configured such that when the temperature drops below a predetermined temperature, the male claw hardens again, so that the male claw re - engages with the female claw to re - seal the opening. 4. The zipper packaging bag according to any one of 3 .

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