JPH046044A - Self-standing bag and usage thereof - Google Patents

Abstract

PURPOSE:To facilitate filling and to improve filling effiency by a method wherein two sidewall films are jointed at both side parts, and the two sidewall films and a twice-folded bottom wall film are jointed by heat sealing at the respective parts so that non-jointed part is formed in the middle of each of the parts. CONSTITUTION:A bag 30 consists off two sidewall films 32 and a bottom wall film 33 inserted into a bottom part 36 of the two sidewall films 32 in a doubled-up state. The two sidewall films 32 are jointed at the both side parts 34. The respective parts of the two sidewall films 32 and the doubled-up bottom wall film 33 are jointed by heat sealing at bottom side parts 35. At the time of heat sealing of the bottom seal-jointed part 35, a part corresponding to a non-jointed part 42 is not heated, and the non-jointed part 42 is formed in both front and back parts. When contents are filled in a self-standing bag 30, one of the non-jointed parts 42 is used as a filling mouth and the other one is for an air vent.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a self-standing bag with high sealability used for storing food products in the form of liquids, granules, powders, etc. relates to a self-supporting bag having at least two unjoined parts formed at the bottom of the bag.

[Prior Art] Conventionally, a bag having the form shown in FIG. 6 has been used as one of the packaging bags for liquids and powders. This bag 10 is designed so that the tip 18 can be cut to make it easy to take out the contents when in use.
8 is getting thinner. The bag 10 has two sidewall films 12
It has a structure in which the periphery of the container is sealed and joined, and before filling with the contents, only the tip portion 18 and side portions 14 are joined, and the bottom portion 16 is left unjoined. The contents are filled from the unbonded bottom, followed by sealing the bottom 16.

After that, when using the contents, the tip 18 is cut off,
The contents are removed. However, since the bag 10 is a glove, there are problems in that the amount of contents filled is small and the appearance after filling is poor.

As a means to solve this problem, for example,
As disclosed in Japanese Patent No. 43671, a device is known in which a bottom member folded in two is inserted into the bottom side to increase the amount of filling and also to be able to stand on its own. As shown in Figure 6,
This type of bag 20 has two sidewall films 22 and a bag 22 which is inserted into the bottom part 26 of the two sidewall films in a bifold state.
It consists of two bottom wall films 23. The two side wall films 22 are sealed together at both sides 24, and the two side wall films 22 and each part of the bottom wall film 23 folded in half are sealed together in a manner that curves toward the bottom side. be done. Before filling with the contents, the tip portion 28 is in an unbonded state, and the contents are filled from there, and then the tip portion 28 is
are sealed.

When the contents are subsequently used, the tip 28 is cut off,
The contents are removed.

[Problem to be Solved by the Invention J The bag disclosed in the above-mentioned Japanese Patent Application Laid-open No. 143671/1983 has an increased filling capacity and can stand on its own, so it looks good after filling. It must be done from the tapered tip 28. However, since the tip portion 28 is formed narrowly in order to take out the contents, it is difficult to
Another disadvantage was that it was difficult to remove air.

The present invention has been made in view of the problems of the prior art, and an object thereof is to provide a self-supporting bag that is easy to fill, has a large amount of filling, and has a good appearance, and a method for using the same.

[Means to solve problems]

In order to achieve the above object, the self-standing bag according to the present invention includes a side wall portion made of a laminated resin film, and a bottom wall portion made of a laminated resin film disposed at the bottom of the side wall portion. In the bag, the side wall portion is composed of two side wall films, and the bottom wall portion is composed of one bottom wall film inserted in a bifold state at the bottom of the two side wall films,
The two side wall films are sealed together on both sides, and the two side wall films and each part of the folded bottom wall film are sealed together so that an unjoined part is formed in the center of each. It is characterized by being

In a preferred embodiment, the seal has a side seal that is wide on the bottom side and slopes inward toward the tip, and the width of at least one of the unjoined portions of the bottom is wider than the width of the tip.

Furthermore, the method of using the self-supporting bag according to the present invention includes a step of filling the contents from one of the unjoined parts in the self-supporting bag, and a step of sealing and joining the two end joints after filling the inner 8 parts. It is characterized by comprising the following.

[Function] With the above structure, in the self-standing bag according to the present invention, at least one portion of the unjoined portion is used as a filling port, and the other portions are used as an air vent.

After filling the contents, the unjoined parts are sealed and joined.

[Example] Fig. 1 is a plan view showing a squeeze type self-supporting bag according to the present invention in an inverted state. The bag 30 has two sidewall films 3
2 and the bottom part 36 of the two sidewall films (Figure 1 shows the film upside down, so the bottom part 36 is above the figure)
The bottom wall film 33 is inserted into the bottom wall film 33 in a folded state.

The side wall film 32 is made of a laminated resin film, which has a resin layer with excellent chemical resistance and mechanical properties such as polyester (PET), polypropylene (PP), or nylon (Ny) on the outer surface, and has a resin layer with excellent chemical resistance and mechanical properties on the inner surface. The side has a heat-sealable resin layer made of linear low density polyethylene (LLDPE) or the like.

The bottom wall film 33 is made of a laminated resin film, which is made of 1. The outer side has a resin layer made of polyester (PET) or nylon (Ny), which has excellent chemical resistance and mechanical properties, has a higher melting point than the inner layer, and is virtually non-heat-sealable, and the inner side has a resin layer that is not heat-sealable. Possible with a resin layer such as linear low density polyethylene (LLDPE).

The material of each layer used in the laminated structure of both films 32 and 33 can be varied depending on the contents, taking into consideration the sealability and basic characteristics as described above.

The two sidewall films 32 are joined at both side portions 34 by heat sealing. Each part of the two side wall films 32 and the bottom wall film 33 folded in half is the bottom part 35.
are joined by heat sealing. Here, in consideration of strength, independence, etc., the bottom seal joint 35 is generally formed along a line that curves toward the bottom as shown in the figure. Additionally, in order to increase the self-supporting nature, a portion of the bottom wall film 33 corresponding to the side seal portion 34 between the bottom wall film 33 and the side wall film 32 is usually cut off (not shown), and the bottom wall film 33 is cut off (not shown). Side sealing is also possible in areas where there are An unjoined portion 42 is formed approximately at the center of both bottom seal joint portions 35, respectively.

The formation of the bottom seal joint 35 is carried out in a heat sealing device (not shown), where the same device has a sealing bar with a curved shape corresponding to the bottom seal joint 35. The two sidewall films 32 of the self-supporting bag 30 are sandwiched between the seal bars from the outside of the wound, heated, and sealed. At this time, sealing conditions are set appropriately so that the resin layers on the outer surface side of the folded bottom wall film 33 are not bonded together by heat sealing, and each part of the two side wall films 32 and the bottom wall film 33 folded in half is set as appropriate. Seal joint only between.

In addition, the seal bar of the heat sealing device has an unjoined portion 42.
It has a notch with a shape corresponding to the shape. Therefore, when the bottom seal joint portion 35 is heat-sealed, the portion corresponding to the unjoined portion 42 is not heated, and the unjoined portion 42 (see FIG. 2) is formed on each of the front and back sides.

In the case of a deformed shape such as a substantially triangular shape or a substantially trapezoidal shape as shown in the figure, it is preferable that at least one of the unjoined parts 42 is formed wider than the width of the tip 38; In this way, the filling opening can be made wider and filling is easier.

When filling the self-supporting bag 30 with the contents, as shown in FIG. 2, one of the unjoined parts 42 (left side in FIG. (center right) is used as an air vent.

After filling the contents, both unjoined parts 42 are joined by heat sealing, as shown in FIG. 3, and the contents stored in the self-supporting bag 30 are distributed. When the contents are to be used after that, the tip 38 is cut off 44 as shown in FIG.
The contents are removed.

Although the squeeze-type self-supporting bag has been described in detail as an embodiment of the present invention, the present invention is also applicable to other types of self-supporting bags. Further, the position and number of the unjoined portions 42 can be changed as necessary. For example, in the above embodiment, the side wall is formed by stacking two side wall films 32, but one film may be folded on the tip end 38 side and stacked.

[Effects of the Invention] According to the self-supporting bag according to the present invention, it can be easily manufactured using the same type of device as the conventional one by only slightly changing the seal bar of the heat sealing device. In addition, it is easier to fill than conventional free-standing bags, and filling efficiency can be improved. Furthermore, the large filling capacity and good appearance of a self-standing bag are not impaired at all.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the self-supporting bag according to the present invention in an inverted state, Fig. 2 is an inverted vertical sectional side view showing the state of filling the contents in the same embodiment, and Fig. 3 is an embodiment of the same embodiment. FIG. 4 is an inverted longitudinal side view showing the state after filling the contents in the example; FIG. 4 is a plan view showing the state when the contents are in use in the same example;
FIG. 5 is a plan view showing a conventional flat bag, and FIG. 6 is a plan view showing a conventional self-supporting bag. 30... Self-supporting bag, 32... Side wall film, 33...
・Bottom wall film, 35...bottom seal joint, 42・
... Patent attorney Takehiko Suzue, representing the unjoined applicant! IJ Figure Figure Figure Figure Figure

Claims (3)

[Claims] (1) a side wall portion made of a laminated resin film; a bottom wall portion made of a laminated resin film disposed at the bottom of the side wall portion;
In the self-standing bag, the side wall portion is made up of two side wall films, the bottom wall portion is made of one bottom wall film inserted in a folded state into the bottom of the two side wall films, and the above two The two side wall films are sealed together at both sides thereof, and the two side wall films and each part of the folded bottom wall film are sealed together so that an unjoined part is formed in the center of each. A self-supporting bag characterized by: (2) Claim (1) further comprising a side seal that is wide at the bottom side and slopes inward toward the tip side, and the width of at least one of the unjoined portions of the bottom portion is wider than the width of the tip portion. Freestanding bag as described. (3) Claim (1) or (2) characterized by comprising the steps of filling content from one of the unjoined parts, and sealing and joining both the unjoined parts after filling the content.
) How to use the self-supporting bag as described.