JP2004175378A - Self-supporting bag - Google Patents

Abstract

An object of the present invention is to increase the degree of freedom in the arrangement of a filling port and a spout in a self-standing bag, and to improve aesthetic appearance.
The self-standing bag (10) is formed by molding a synthetic resin bag body (11) comprising a body (20) and a bottom (30), and the bag body (11) can be folded before filling the bag body (11) with a content agent. In this case, a filling port forming part 31 is provided on the bottom part 30 of the bag body 11, and a spout forming part 22 is provided on the body part 20.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flexible self-supporting bag.
[0002]
[Prior art]
As a self-standing bag, there is a self-standing bag in which a front and back synthetic resin body sheet and a synthetic resin bottom sheet are laminated to form a flexible bag main body. In such a self-standing bag, the amount of resin used in the bag main body is smaller than that of the rigid bottle, and the bag main body can be folded and stored before filling the contents into the bag main body (Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 3077751 (3 pages, FIG. 2)
[0004]
[Problems to be solved by the invention]
The conventional self-standing bag has the following problems.
{Circle around (1)} The bag body is manufactured by preparing a plurality of sheets (body sheet, bottom sheet) and bonding them together, and the manufacturing process is complicated.
[0005]
(2) The body of the bag body is formed by laminating the front and back body sheets in a plane, and when the body swells due to the filling of the content agent, the body becomes wrinkled and the aesthetic appearance of the bag body is reduced. Spoil.
[0006]
(3) The torso sheet and the bottom sheet are non-adhesive that do not dissolve and become dirty even when heated by an adhesive inner film that enables lamination and a heat seal bar that is in contact with the outer edge of the torso sheet. A laminated film obtained by laminating an outer film with an intermediate adhesive layer is used. For this reason, when the content agent contains a surfactant or a solvent, the surfactant or the solvent may penetrate into the intermediate adhesive layer from the inner film to cause peeling of the inner film and the outer film, and the stability of bag quality may be impaired. is there.
[0007]
{Circle around (4)} The intersection of the torso sheet and the bottom sheet is vulnerable to the impact of dropping and is easily broken.
[0008]
{Circle around (5)} Since the spout is provided at the planar bonding portion of the front and back trunk sheets, it is easy to close. In order to prevent blockage, it is necessary to insert a straw or the like between the front and back trunk sheets.
[0009]
Therefore, according to Japanese Patent Application No. 2002-206187, the present applicant aims to simplify the manufacturing process, improve the aesthetic appearance of the bag body, stabilize the bag quality, and improve the drop strength in the self-standing bag. A self-standing bag that is made by molding a synthetic resin bag body consisting of a body and a bottom, with the aim of ensuring a stable spout, and allowing the bag body to be folded before filling the bag body with the contents. Has been proposed.
[0010]
In the self-supporting bag 1 to be molded, as shown in FIG. 4, a bag main body 1A is formed by a mold 2, and a filling port 1B and a spout forming section 1C are provided at the upper part of the body of the bag main body 1A. After the self-standing bag 1 is filled with the contents agent from the filling port 1B by the filling machine 3, the filling port 1B is sealed by the sealing machine 4 to be commercialized.
[0011]
However, the self-standing bag 1 to be molded has the following problems.
(1) Since both the filling port 1B and the spout forming section 1C are provided at the upper part of the body of the bag body 1A, the filling port 1B cannot be provided at the center of the upper portion of the bag body 1A. And the degree of freedom of arrangement of the spout forming portion 1C is low. The filling port 1B is provided in a limited area near one side of the upper part of the bag body 1A, and the filling port 1B cannot be made wide. Since the spout forming portion 1C is provided so as to be biased toward the other side of the upper portion of the bag body 1A, when pouring the high-viscosity liquid in the self-standing bag 1 into the refilling container, the spout forming portion 1C is moved to the refilling container. You cannot insert your hand into the filling port and release it.
[0012]
(2) The filling port 1B sealed by heat sealing or the like is present at the upper part of the bag body 1A, which impairs the aesthetic appearance of the self-standing bag 1.
[0013]
An object of the present invention is to increase the degree of freedom of arrangement of a filling port and a spout in a self-standing bag and to improve aesthetic appearance. At the same time, the manufacturing process will be simplified, the bag quality will be stable, the drop strength will be improved, and the spout will be secured.
[0014]
[Means for Solving the Problems]
The invention according to claim 1 is a self-standing bag in which a bag body made of a synthetic resin comprising a body and a bottom is formed by molding, and the bag body can be folded before filling the bag body with a content agent. A filling port forming part is provided at the bottom of the bag body, and a spout forming part is provided at the body part. Here, the body of the bag is a portion including the upper portion of the bag body.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, the self-standing bag 10 is formed by blow-molding a synthetic resin bag main body 11 composed of a body portion 20 and a bottom portion 30 into a three-dimensional shape (three-dimensional shape). The bag body 11 is made foldable before filling.
[0016]
The bag body 11 has a container 21 for the content agent composed of a body 20 and a bottom 30, and is formed by blow molding such that a filling port forming part 31 is provided on the bottom 30 and a spout forming part 22 is provided on the body 20. Is done.
[0017]
As shown in FIG. 2, the filling port forming section 31 forms a filling port 31 </ b> A having a large area at a desired position within the range of the bottom portion 30 in the bag body 11, in the present embodiment, at a substantially central position. After the self-standing bag 10 is filled with the content agent from the filling port 31A, the filling port forming portion 31 is sealed by heat sealing or ultrasonic sealing or the like. Thereby, the filling port forming part 31 becomes the seal part 31B.
[0018]
As shown in FIG. 1, the spout forming portion 22 can form the spout 22 </ b> A at a desired position within the range from the upper portion to the side portion of the body portion 20 of the bag body 11, in the present embodiment, substantially at the center of the upper portion. To The spout 22A is formed by cutting the spout forming section 22.
The self-standing bag 10 can be manufactured by direct blow molding.
[0019]
In the direct blow molding, the parison is extruded and stretched in the circumferential direction by blowing air into the parison to form the bag body 11. The direct blow molding forms the bag body 11 composed of a single layer or a laminated resin layer. As a constituent resin material of the bag body 11 by direct blow molding, LDPE (low-density polyethylene) or L-LDPE (linear low-density polyethylene) can be adopted for a single layer, and the outer layer is HDPE (high-density polyethylene) for lamination. ), The inner layer may be made of LDPE or L-LDPE.
[0020]
In the self-standing bag 10, the folded form of the bag body 11 can be obtained by stacking the bottom portion 30 on the body portion 20 as shown in (a) or (b) below.
[0021]
(A) A form in which the trunk 20 is flattened and the flat bottom 30 is bent toward the lower part of the trunk 20.
[0022]
(B) A form in which the bottom 30 is inflated and formed in a dome shape, and the center of the bottom 30 is folded into the inside of the body 20 along the parting line of the blow molding die to flatten the body 20.
[0023]
The self-standing bag 10 is suitable for use as a self-standing bag which is a product containing a content agent containing at least one of 0.1% to 50% of a surfactant or 0.1% to 50% of a solvent.
[0024]
The self-standing bag 10 is manufactured, for example, by the following procedure (FIG. 3).
(1) The bag body 11 is blow-molded by a blow mold 40. At this time, the filling port forming portion 31 is formed on the side of the air blowing port of the blow molding die 40, and the spout forming portion 22 is formed on the side of the mold clamping portion of the blow molding die 40.
[0025]
(2) The bag body 11 is held on the article holder 50 in an inverted state (the bottom part 30 having the filling port forming part 31 is upper, and the side of the spout forming part 22 is lower), and the content agent discharged by the filling machine 60 is discharged. The bag body 11 is filled from the filling port 31A. Subsequently, the filling port 31A is sealed by the sealing machine 70 to form a seal portion 31B.
[0026]
(3) The bag main body 11 is inverted so that the bottom portion 30 having the filling port forming portion 31 (the seal portion 31B) is placed in the lower position, and the self-standing bag 10 in a product state is obtained.
[0027]
The self-standing bag 10 has the following functions.
{Circle around (1)} Since the filling port forming part 31 is provided on the bottom part 30 of the bag body 11 and the spout forming part 22 is provided on the body part 20, the filling port 31A is provided at the center of the upper part of the bag body 11, for example. The degree of freedom in the arrangement of the spout 22A is increased.
[0028]
{Circle around (2)} The filling port 31A is opened in a large area at the bottom 30 of the bag body 11, so that filling workability can be improved. When the self-standing bag 10 is erected, the sealing portion 31B of the filling port 31A is located on the bottom 30 that is invisible to the human eye, and the aesthetic appearance is improved.
[0029]
{Circle around (3)} When the spout 22A is provided substantially at the center of the upper part of the body 20 of the bag body 11, the spout 22A is inserted into the filling port of the refill container so that the entire weight of the self-standing bag 10 is well-balanced. Can be left in the store, and the refilling workability is good. It is particularly useful when refilling high viscosity liquids.
[0030]
{Circle around (4)} The blow mold 40 has an air blowing port at one of the upper and lower ends, and a mold clamping part at the other end. Accordingly, by forming the filling port forming portion 31 on the side of the air blowing port of the blow molding die 40 and forming the spout forming portion 22 on the side of the mold clamping portion of the blow molding die 40, the bag An unsealed filling port 31A can be formed at the bottom 30 of the main body 11, and a closed spout forming section 22 can be formed at the body 20. The self-standing bag 10 of the above item (1) can be easily manufactured.
[0031]
In addition, the self-standing bag 10 also has the following operation.
(1) The flexible bag main body 11 made of synthetic resin is blow-molded into a three-dimensional shape (three-dimensional shape), and the bag main body 11 can be folded and stored flat before filling the bag main body 11 with the content agent. At the time of filling, the bag body 11 is inflated three-dimensionally so as to be self-supporting. The bag body 11 is made thin and flexible by blow molding, uses a smaller amount of resin than a bag in which a conventional film is attached, and has good storage efficiency due to flat storage.
[0032]
(2) The filling portion 31 for filling the bag body 11 with the content agent can be provided over the entire width of the upper edge of the body portion 20 of the bag body 11 or near the entire width, and the filling property of the content agent is good.
[0033]
(3) The spout forming part 22 for the content agent from the bag body 11 is formed as a part of the body part 20 at the time of blow molding of the bag body 11, or the opening at the upper edge of the blow molded body part 20. Can be formed by sealing. Further, since the spout forming portion 22 is formed into a three-dimensional shape during blow molding of the bag body 11, it is difficult to close the spout.
[0034]
(4) The folded form of the bag body 11 can be made to be a substantially planar shape in which the trunk 20 and the bottom 30 are overlapped.
[0035]
(5) Since the bag body 11 is blow-molded, the cutting of the film and the sealing of the film, which are necessary for the conventional self-standing bag, can be largely omitted, so that the manufacturing process is simple.
[0036]
(6) The bag body 11 is formed by molding the body 20 and the bottom 30 in a three-dimensional shape. When the body 20 is swelled due to the filling of the content agent, the body 20 does not wrinkle, and the bag body 11 The aesthetic appearance can be improved.
[0037]
(7) Since the bag body 11 is not formed by laminating sheets, it is not always necessary to form the bag body 11 by a laminated film with an adhesive layer interposed. Therefore, the bag body 11 can be constituted by a single-layer film, and there is no possibility that the content agent containing a surfactant or a solvent penetrates into the adhesive layer of the laminated film to cause peeling of the laminated film, and the bag quality is stable. Can be achieved.
[0038]
(8) The trunk portion 20 and the bottom portion 30 of the bag body 11 are integrally formed, and are strong against a drop impact and hard to be broken.
[0039]
(9) The spout forming part 22 formed on the bag body 11 is 0 to 90 degrees with respect to the horizontal direction parallel to the bottom 30 of the bag body 11, and preferably 30 degrees when the viscosity of the content agent is low. When the viscosity of the content agent is high, in the range of 注 60 °, optimally 45 °, and when the viscosity of the content agent is high, optimally, it can be easily poured out by inclining at 90 °.
[0040]
(10) Since the spout forming portion 22 formed in the bag body 11 can be designed to be formed in a mold so as to protrude outward from the bag body 11, the projecting shape can be freely configured, and the projecting length of the spout can be reduced. Bags that are easy to pour out can be easily manufactured, for example, by lengthening or widening the spout.
[0041]
The self-standing bag of the present invention is not limited to blow molding, but may be injection molding or the like as long as it is formed by die molding.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in a self-supporting bag, the degree of freedom of arrangement | positioning of a filling port and a spout can be increased, and an aesthetic appearance can also be improved. At the same time, the manufacturing process can be simplified, the bag quality can be stabilized, the drop strength can be improved, and the spout can be secured stably.
[Brief description of the drawings]
FIG. 1 shows a self-standing bag, wherein (A) is a perspective view and (B) is a longitudinal sectional view.
FIG. 2 is a perspective view showing an inverted state of a self-standing bag.
FIG. 3 is a schematic view showing a manufacturing process of a self-standing bag.
FIG. 4 is a schematic view showing a comparative example of a manufacturing process of a self-standing bag.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Self-standing bag 11 Bag main body 20 Body part 22 Spout forming part 22A Spout 30 Bottom part 31 Filling port forming part 31A Filling port 31B Seal part

Claims (3)

A self-standing bag made by molding a synthetic resin bag body consisting of a body and a bottom, and allowing the bag body to be folded at a stage before filling the contents into the bag body,
A self-supporting bag having a filling port forming section at the bottom of the bag body and a spout forming section at the body. The self-standing bag according to claim 1, wherein a spout forming portion is provided substantially at the center of an upper portion of the body of the bag body. The bag body is formed by blow molding, a filling port forming portion is formed on the side of the air blowing port of the blow molding die, and a spout forming portion is formed on the side of the mold closing portion of the blow molding die. Item 3. The self-standing bag according to Item 1 or 2.

Images