JP4133192B2 - Self-supporting bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible freestanding bag.
[0002]
[Prior art]
As a self-supporting bag, a flexible bag body is formed by laminating a front and back synthetic resin body sheet and a synthetic resin bottom sheet, and a spout can be formed at the upper edge seal part of the front and back body sheet There is. In such a self-supporting bag, the amount of resin used in the bag body is smaller than that of a hard bottle, and the bag body can be folded and stored at the stage before filling the contents into the bag body (Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No.3077751 (page 3, Fig. 2)
[0004]
[Problems to be solved by the invention]
Conventional free-standing bags have the following problems.
(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 part of the bag body is constructed by laminating the front and back body sheets in a plane, and when the body part swells due to the filling of the contents, the body part is wrinkled to give the bag body an aesthetic appearance. To lose.
[0006]
(3) The body sheet and the bottom sheet are non-adhesive so that they are not melted and fouled by the heat of the adhesive inner film for enabling the bonding and the heat seal bar for bonding in contact with the outer edge of the body 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 solvent may permeate the intermediate adhesive layer from the inner film and cause peeling of the inner film and the outer film, which may impair the stability of the bag quality. is there.
[0007]
(4) The bonding intersection of the body sheet and the bottom sheet is weak against the impact of dropping and easily cracked.
[0008]
{Circle around (5)} The spout is provided at the flat laminating portion of the front and back body sheets, so that it is easy to block. In order to prevent the blockage, it is necessary to sandwich a straw or the like between the front and back body sheets.
[0009]
Therefore, according to Japanese Patent Application No. 2002-206187, the present applicant can simplify the manufacturing process, improve the aesthetic appearance of the bag body, stabilize the bag quality, and improve the drop strength in a self-supporting bag. In order to ensure a stable spout, a synthetic resin bag body consisting of a body and a bottom is molded, and the bag body can be folded before filling the bag body with the contents. Has proposed.
[0010]
However, in a self-supporting bag molded with a mold, the surface of the bag body is smooth and may slip off when held by hand.
[0011]
Moreover, in the self-supporting bag which consists of pasting of the conventional synthetic resin sheet | seat, the cutting planned line is printed and displayed on the opening planned part for pouring out a content agent.
[0012]
However, in a self-supporting bag that has been molded, the bag body has a three-dimensional shape, and the display of the planned cutting line by printing is a separate process from the molding process of the container. However, it is easy to slip on the surface of the bag body and the planned opening portion cannot be cut correctly and cleanly.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to improve the usability of a self-supporting bag molded by a mold that is easy to hold by hand.
[0014]
Another object of the present invention is to correctly and neatly cut the planned opening portion for pouring out the content agent in a self-supporting bag molded with a mold.
[0015]
[Means for Solving the Problems]
The invention of claim 1 is a self-supporting bag obtained by blow-molding a synthetic resin bag body comprising a body portion and a bottom portion, and a spout is formed in a protruding manner outwardly at a part of the upper edge portion of the body portion. The unscheduled opening part is formed integrally with the bag body, the unscheduled cutting guide part is formed on the unscheduled opening part, and the cutting guide part is an annular recess formed by a valley between two adjacent convex parts. It is what I did .
[0016]
According to a second aspect of the present invention, in the first aspect of the present invention, a concave portion or a convex portion is further provided on a part of the surface of the body portion of the bag body .
[0017]
(First Reference Example ) (FIGS. 1 to 3)
As shown in FIG. 1, the self-supporting bag 10 is formed by blowing a synthetic resin bag body 11 composed of a body portion 12 and a bottom portion 13 into a three-dimensional shape (three-dimensional shape) and filling the bag body 11 with a content agent. The bag body 11 can be folded.
[0018]
The self-supporting bag 10 can be manufactured by direct blow molding or injection blow molding.
[0019]
In the direct blow molding, the bag body 11 is formed by extruding the parison and stretching in the circumferential direction by blowing air into the parison. In the direct blow molding, a bag body 11 made of a single layer or a laminated resin layer is formed. 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 in the case of a single layer, and HDPE (high density polyethylene) is used for the outer layer in the case of lamination. ), The inner layer may be LDPE or L-LDPE.
[0020]
In injection blow molding, a preform is formed by injection molding, then the mouth of the heated preform is fixed, and the preform is ejected from a jig that fixes the inside of the mouth. The bag body 11 is formed by stretching in the longitudinal direction and then stretching in the circumferential direction by blowing air. In the injection blow molding, it is preferable to form a bag body 11 made of a single resin layer, and cut the bottom of the mouth to make a bag. As a constituent resin material of the bag body 11 by injection blow molding, OPP (stretched polypropylene) or PET (polyethylene terephthalate) can be employed.
[0021]
The self-supporting bag 10 can be formed by folding the bag body 11 such that the bottom portion 13 and the body portion 12 are overlapped as shown in (a) or (b) below.
[0022]
(a) A form in which the body part 12 is flattened and a flat bottom part 13 is bent with respect to the lower part of the body part 12.
[0023]
(b) A form in which the bottom portion 13 is inflated and formed into a dome shape, the center portion of the bottom portion 13 is folded inside the barrel portion 12 along the parting line of the blow mold, and the barrel portion 12 is flattened.
[0024]
In the self-supporting bag 10, a wide opening extending over the full width of the upper edge of the trunk portion 12 of the bag main body 11 or near the full width can be used as a filling port 12 </ b> A for the content agent. The filling port 12A becomes a sealed portion 12B which is sealed by being pressurized by a seal bar so as to be heat-sealed or ultrasonically sealed after the content agent is filled.
[0025]
The self-supporting bag 10 can form the spout 14 in a part of the upper edge side of the body portion 12 when the bag body 11 is blow-molded. The spout 14 is opened by cutting.
[0026]
The self-supporting bag 10 is suitable for use as a self-supporting bag having a content agent containing at least one of surfactants 0.1% to 50% or a solvent 0.1% to 50% as a product.
[0027]
As shown in FIG. 2, the self-standing bag 10 of the first reference example is provided with a recess 11 </ b> A serving as a finger catching portion on the front surface or the back surface of the trunk portion 12 in the bag body 11. The recess 11A can be formed when the bag body 11 is molded.
[0028]
The self-supporting bag 10 has the following effects.
(1) In the self-supporting bag 10, a recess 11 </ b> A is provided on the surface of the body 12 of the bag body 11. Therefore, when the self-supporting bag 10 is held, the finger can be hooked on the recess 11 </ b> A and it is easy to hold. Moreover, it is not necessary to hold it with a hand, and the content can be prevented from popping out.
(2) The concave portion 11A can be formed simultaneously by molding the bag body 11 and is simple.
[0029]
As shown in FIGS. 3 (A) and 3 (B), the self-supporting bag 10 has concave and convex ribs 11B and 11C serving as finger catching portions instead of the concave portions 11A on the surface of the trunk portion 12 of the bag main body 11. It may be provided.
[0030]
The self-supporting bag 10 also has the following effects.
(1) The flexible bag body 11 made of synthetic resin is blow-molded into a three-dimensional shape (three-dimensional shape), and the bag body 11 can be folded and stored in a flat state before filling the bag body 11 with the content agent. When filling the bag, the bag body 11 is inflated in a three-dimensional shape so that it can stand on its own. The bag body 11 is thin-walled and flexible by blow molding, uses less resin than a conventional bag on which a film is bonded, and has good storage efficiency due to flat storage.
[0031]
(2) The filling port 12A of the content agent into the bag main body 11 can be provided over the entire width or near the full width of the upper edge of the trunk 12 of the bag main body 11, and the filling property of the content agent is good. The filling port 12A is sealed after filling.
[0032]
(3) The spout 14 for the content agent from the bag body 11 is formed as a part of the body 12 when the bag body 11 is blow-molded, or the opening at the upper edge of the body 12 that is blow-molded is sealed. Can be formed.
[0033]
(4) The folding form of the bag body 11 can be a substantially flat shape in which the body portion 12 and the bottom portion 13 are overlapped.
[0034]
(5) Since the bag body 11 is blow-molded, the film cutting and film sealing required in the conventional free-standing bag can be largely omitted, and the manufacturing process is simple.
[0035]
(6) The bag body 11 is formed by three-dimensionally forming the body part 12 and the bottom part 13, so that the body part 12 is not wrinkled when the body part 12 is inflated by filling the content agent. Aesthetic appearance can be improved.
[0036]
(7) Since the bag body 11 is not configured by laminating sheets, it is not always necessary to configure the bag body 11 with a laminated film with an adhesive layer interposed. Therefore, the bag main body 11 can be constituted by a single layer film, and the content agent containing the surfactant and the solvent does not penetrate into the adhesive layer of the laminated film to cause the peeling of the laminated film, thereby stabilizing the bag quality. Can be achieved.
[0037]
(8) The body portion 11 and the bottom portion 13 of the bag body 11 are integrally molded, and are strong against the impact of dropping and are not easily broken.
[0038]
(9) The spout 14 formed in the bag body 11 is formed in a three-dimensional shape when the bag body 11 is blow-molded, and thus is not easily blocked.
[0039]
(10) The spout 14 formed in the bag body 11 is in the range of 0 to 90 degrees, preferably 30 to 60 degrees, and optimally 45 with respect to the horizontal direction parallel to the bottom 13 of the bag body 11. By tilting at a degree, it can be easily poured out.
[0040]
(11) Since it is possible to mold the spout 14 formed on the bag body 11 so as to project outward from the bag body 11, the projecting shape can be freely configured, and the spout length of the spout can be increased. Or a bag that is easy to pour out, such as widening the spout width.
[0041]
(Second Reference Example ) (Fig. 4)
The self-supporting bag 10 of the second reference example is different from the self-supporting bag 10 of the first reference example in that the bag body 11 has a cylindrical shape that protrudes outward from the bag body 11 in order to form the spout 14. The planned opening portion 15 is provided with a concave cutting guide portion 16 continuous over the entire circumference of the surface. The annular recessed portion 16A of the cutting guide portion 16 functions as a stopper against the ridge (or other cutting tool). Note that the scheduled opening portion 15 does not necessarily have a protruding shape, and may have a flat shape without requiring a cylindrical shape.
[0042]
According to the self-supporting bag 10 of the second reference example , there are the following actions.
(1) In the self-supporting bag 10, a concave cutting guide portion 16 is provided over the entire circumference of the surface of the scheduled opening portion 15 in the bag body 11 in the planned opening portion 15 for forming the spout 14 of the bag body 11. . By hitting the scissors (or other cutting part) against the recess 16A of the cutting guide part 16, the scissors are cut along the recess 16A without being sandwiched between the side walls of the recess 16A, and the unscheduled opening part 15 is correctly positioned. The spout 14 can be formed by cutting cleanly.
[0043]
(2) The concave cutting guide portion 16 can be simultaneously formed by molding the bag body 11 and is simple.
[0044]
Note that the cutting guide portion 16 may be discontinuous in the circumferential direction of the surface of the scheduled opening portion 15.
[0045]
(Embodiment of the present invention ) (FIG. 5)
The self-supporting bag 10 of the embodiment of the present invention is different from the self-supporting bag 10 of the first reference example in that the continuous opening portion 15 for forming the spout 14 in the bag body 11 is continuous over the entire circumference 2. The convex cutting guides 21 and 22 are provided. An annular recess 23 formed by a valley between adjacent cutting guides 21 and 22 functions as a slip stopper for the ridge.
[0046]
The self-supporting bag 10 according to the embodiment of the present invention has the following effects.
(1) In the self-supporting bag 10, two protruding cutting guide portions 21 extending over the entire circumference of the surface of the scheduled opening portion 15 in the bag body 11 are added to the scheduled opening portion 15 for forming the spout 14 of the bag body 11. , 22 are provided. By applying the scissors to the recesses 23 in the valleys of the adjacent cutting guides 21, 22, the scissors are cut along the recesses 23 without being sandwiched between the side walls of the recesses 23, and the unscheduled opening 15 is correctly The spout 14 can be formed by cutting cleanly.
[0047]
(2) The cutting guide portions 21 and 22 can be simultaneously formed by molding the bag body 11 and are simple.
[0048]
The cutting guides 21 and 22 may be discontinuous in the circumferential direction of the surface of the scheduled opening portion 15.
[0049]
( Third reference example ) (FIG. 6)
The self-supporting bag 10 of the third reference example is different from the self-supporting bag 10 of the first reference example in that the bag body 11 has a strip shape continuous over the entire periphery of the opening scheduled portion 15 for forming the spout 14. This is because the cutting guide portion 31 made of the rough surface 31A is provided. The rough surface 31A of the cutting guide part 31 functions as a stopper against wrinkles.
[0050]
The self-supporting bag 10 of the third reference example has the following effects.
(1) In the self-supporting bag 10, a cutting guide composed of a strip-shaped rough surface 31 </ b> A extending over the entire circumference of the surface of the scheduled opening portion 15 in the bag body 11 to the opening scheduled portion 15 for forming the spout 14 of the bag body 11 Part 31 was provided. By hitting the scissors against the rough surface 31A of the cutting guide portion 31, the scissors cut along the rough surface 31A without frictional contact with the rough surface 31A and cut the planned opening portion 15 correctly and cleanly to spout. 14 can be formed.
[0051]
(2) the cutting guide 31, simultaneously formed by molding the bag main body 11 can (mold roughed), is simple.
[0052]
The rough surface 31 </ b> A of the cutting guide portion 31 may be discontinuous in the circumferential direction of the surface of the planned opening portion 15.
[0053]
Note that the self-supporting bag of the present invention is not limited to blow molding, but may be injection molding or the like as long as it is based on mold molding.
[0054]
【The invention's effect】
According to the present invention, in a self-supporting bag molded with a mold, it can be easily held by hand and the usability can be improved. In addition, according to the present invention, in the self-supporting bag molded with a mold, it is possible to correctly and cleanly cut the planned opening portion for pouring the content agent.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a self-supporting bag.
FIG. 2 is a schematic view showing a self-supporting bag of a first reference example .
FIG. 3 is a schematic view showing a modification of the self-supporting bag.
FIG. 4 is a schematic view showing a cutting guide portion of a second reference example .
FIG. 5 is a schematic diagram showing a cutting guide portion according to an embodiment of the present invention .
FIG. 6 is a schematic diagram showing a cutting guide portion of a third reference example .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Self-supporting bag 11 Bag main body 11A Concave part 11B, 11C Irregular shaped rib 12 Body part 13 Bottom part 14 Spout 15 Opening scheduled part
21 and 22 cutting guide
23 Annular recess

Claims (3)

A self-standing bag made by blow molding a synthetic resin bag body consisting of a trunk and a bottom,
A part to be opened is formed integrally with the bag body to form a spout in a protruding manner outwardly at a part of the upper edge of the body part,
Forming a cutting guide part with a stopper in the planned opening part,
A self-supporting bag in which the cutting guide portion is an annular recess formed by a valley between two adjacent convex portions . The self-supporting bag according to claim 1, wherein a concave portion or a convex portion is provided on a part of the surface of the body portion of the bag body .   A self-supporting bag product comprising the self-supporting bag main body according to claim 1 or 2 containing a content agent containing at least one surfactant or solvent as a component.

Images