JP2005022759A - Self-supporting bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-supporting bag, which improves efficiency in positioning an outlet relative to a mouth of a container for refilling and also improves feedability. <P>SOLUTION: The self-supporting bag 10 is made by molding a synthetic resin bag body 11, and the bag body 11 is made foldable before filling the bag body 11 with a content agent. The self-supporting bag 10 is provided with a locking part 50 near the outlet 24A on the bag body 11, and the locking part 50 can be locked on the container for refilling. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a self-supporting bag suitable as a refill container.

As a self-supporting bag, as described in Patent Document 1, 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 protrudes from the side of the bag body. At the same time, there is one provided with a notch for improving the positioning of the spout with respect to the mouth of the refill destination container.
JP-A-11-59701

Conventional free-standing bags have the following problems.
(1) The notch portion of the bag body is notched in the body sheet and has low rigidity, and when the bottom side of the bag body is lifted while being locked to the mouth of the refill destination container, Since the weight of the bag body cannot be fully supported, the bag body is easily bent and detached from the mouth portion of the refill destination container, and it is difficult to exhibit the position of the spout with respect to the mouth portion of the refill destination container.

(2) When self-supporting bags are stacked in a sashimi shape and fed to a filling line or the like, the notch portions of the overlapping bag bodies are flexible and easily bend and deform to catch each other, resulting in poor feeding performance.
The conventional free-standing bag has the following problems.

  (3) 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.

  (4) 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.

  (5) The body part sheet and the bottom part sheet are non-adhesive so that they are not melted and fouled by heating of the adhesive inner film for enabling lamination and the heat seal bar for laminating 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.

  (6) The bonding intersection of the trunk sheet and the bottom sheet is weak against the impact of dropping and easily cracked.

  (7) Since the spout is provided in the planar laminating portion of the front and back body sheet, 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.

  The subject of this invention is improving the feeding property while improving the positioning property of the spout with respect to the opening | mouth part of a refilling destination container in a self-supporting bag.

  The present invention is a self-supporting bag formed by molding a bag body made of a synthetic resin and capable of folding the bag body at the stage before filling the bag body with a content agent, in the vicinity of the spout in the bag body. A locking portion that can be locked to the pouring container is provided.

(Example 1)
As shown in FIG. 1, the self-supporting bag 10 has a three-dimensional shape (three-dimensional shape) made of a synthetic resin bag main body 11 composed of a body portion 20 and a bottom portion 30 (the bottom portion 30 is connected to the lower end of the body portion 20). The bag body 11 can be folded before being filled with the contents in the bag body 11 by blow molding.

  The bag body 11 is formed with a container 21 for the contents comprising the body 20 and the bottom 30 and a wide opening over the entire width of the upper edge of the body 20 or near the entire width, and filling for the contents. The container 21, the filling port forming portion 22, and the shoulder portion so as to smoothly connect the housing portion 21 and the filling port forming portion 22 by the shoulder portion 23. 23 is blow molded. The shoulder portion 23 is directed from the housing portion 21 toward the filling port forming portion 22 in a side view of the self-supporting bag 10 (a direction seen along a longitudinal direction of a seal portion 22B described later of the filling port forming portion 22). It is narrowed to form an inverted V shape.

  After the self-supporting bag 10 is filled with the content agent from the filling port 22A, the front portion 20A and the back portion 20B of the filling port forming portion 22 are clamped by a seal bar, and the front portion 20A and the back portion 20B are heat sealed or ultrasonically sealed. Seal by fusing. Thereby, the filling port forming part 22 becomes the seal part 22B.

  As shown in FIG. 1, the self-standing bag 10 can form a spout forming portion 24 for forming a spout 24 </ b> A in a part on the upper edge side of the trunk portion 20 when the bag body 11 is blow-molded. The self-supporting bag 10 is cut at a time along a cutting line L that is recessed along the outer periphery of the spout forming portion 24 when the content agent is poured out from the spout 24A formed in the bag body 11, and the spout 24A. To the outside of the bag.

  As shown in FIG. 2, the self-supporting bag 10 is provided with a catching recess 51 that constitutes a locking portion 50 on the side edge on the pouring direction side in the vicinity of the spout 24 </ b> A in the trunk portion 20. By hooking the catching recess 51 on the edge of the counterpart container, the bag body 11 can be stably positioned with respect to the counterpart container and poured out from the spout 24A.

The self-supporting bag 10 can be manufactured by direct blow molding.
In the direct blow molding, the parison is extruded, the parison stored in the left and right molds is sandwiched between the molds, and then the bag body 11 is formed by extending the circumference by blowing air into the parison. To do. 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), L-LDPE (linear low density polyethylene) or HDPE (high density polyethylene) can be adopted in the case of a single layer. The outer layer may be HDPE (high density polyethylene) and the inner layer may be LDPE or L-LDPE. In order to improve the oxygen barrier property, EVOH (ethylene / vinyl alcohol copolymer resin) or nylon may be used for the intermediate layer.

  The self-supporting bag 10 can be configured such that the bag body 11 is folded in such a manner that the bottom portion 30 is superimposed on the trunk portion 20 as shown in (i) or (ii) below.

(i) A form in which the body part 20 is flattened and a flat bottom part 30 is bent with respect to the lower part of the body part 20.
(ii) A form in which the bottom portion 30 is inflated and formed into a dome shape, the center portion of the bottom portion 30 is folded inside the barrel portion 20 along the parting line of the blow molding die, and the barrel portion 20 is flattened.

  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.

The self-supporting bag 10 has the following effects.
The bag body 11 is three-dimensionally formed and has a certain rigidity. Therefore, it is easy to support by hand when the content agent is poured out, and the pouring property is good.

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.

  (2) The filling port forming portion 22 of the content agent into the bag body 11 can be provided over the entire width or near the full width of the upper edge of the trunk portion 20 of the bag body 11, and the filling property of the content agent is good.

  (3) The spout forming part 24 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 body part 20 that is blow-molded Can be formed by sealing. Moreover, since the spout formation part 24 is shape | molded in three dimensions at the time of blow molding of the bag main body 11, it is hard to block | close.

  (4) The folding form of the bag body 11 can be a substantially flat shape in which the body 20 and the bottom 30 are overlapped.

  (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.

  (6) The bag body 11 is formed by three-dimensionally forming the body part 20 and the bottom part 30. When the body part 20 is swollen by filling the content agent, the body part 20 is not wrinkled. Aesthetic appearance can be improved.

  (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.

  (8) The body portion 20 and the bottom portion 30 of the bag body 11 are integrally formed, and are strong against the impact of dropping and are not easily broken.

  (9) The spout forming part 24 formed on the bag body 11 is optimally within the range of 0 to 90 degrees, preferably 30 to 60 degrees with respect to the horizontal direction parallel to the bottom 30 of the bag body 11. Can be easily poured by tilting at 45 degrees.

  (10) Since the spout forming portion 24 formed on the bag body 11 can be designed as a mold that protrudes outward from the bag body 11, the protruding shape can be freely configured, and the protruding length of the spout can be increased. Bags that are easy to pour out can be easily manufactured by elongating or widening the width of the spout.

  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.

(Example 2)
As shown in FIGS. 3 to 5, the self-supporting bag 10 of Example 2 has a pour destination container (a refill destination container) on the side edge on the pour-out direction side in the vicinity of the spout 24 </ b> A in the trunk portion 20 of the bag body 11. ) A locking portion 60 that can be locked to 1 is provided. As shown in FIG. 5, the bag body 11 is stably positioned and poured with respect to the refill destination container 1 by hooking the recess 61 constituting the locking portion 60 to the edge of the mouth portion 2 of the refill destination container 1. The contents can be poured out from the mouth 24A. When the bag body 11 is formed by inserting a parison into a mold having a protrusion corresponding to the recess 61 and bringing the parison into close contact with the inner surface of the mold by blowing air into the interior of the parison. A transfer mark of the protrusion transferred to the outer edge of the protrusion is defined as a recess 61.

  A plurality of concave portions 61 can be provided as the locking portion 60, and any one of the concave portions 61 can be selectively used according to the diameter of the mouth portion 2 of the refill destination container 1. The self-supporting bag 10 of FIGS. 3 to 5 has two concave portions 61 as the locking portions 60, and a convex portion 62 is formed between the two concave portions 61, 61.

The self-supporting bag 10 has the following effects.
(a) The bag body 11 and its locking portion 60 are molded and excellent in rigidity, and when the bottom side of the bag body 11 is lifted while being locked to the mouth 2 of the refill destination container 1, The state where the weight of the main body 11 is supported and the mouth portion 2 of the refill destination container 1 is locked without being bent is maintained, and the pouring spout 24A is stably positioned with respect to the mouth portion 2 of the refill destination container 1. The refill destination container 1 can be refilled without spilling the contents.

  (b) When feeding the self-supporting bag 10 in a flat folded state in a sashimi state, the latching portions 60 of the overlapping bag main bodies 11 are bent and deformed due to high rigidity and are caught with each other. It can be fed smoothly without any problems. The empty bag body 11 can be inflated and carried independently.

Example 3
As shown in FIG. 6, the self-supporting bag 10 of Example 3 is placed in the pouring destination container (refill destination container) 1 on the side edge on the pouring direction side in the vicinity of the spout 24 </ b> A in the trunk portion 20 of the bag body 11. A locking portion 70 that can be locked is provided. By hooking the convex portion 71 constituting the locking portion 70 to the edge of the mouth portion 2 of the refill destination container 1, the bag main body 11 is stably positioned with respect to the refill destination container 1 and the content agent is supplied from the spout 24A. Can be poured out. When the bag body 11 is formed by inserting a parison into a mold having a concave portion corresponding to the convex portion 71 and bringing the parison into close contact with the inner surface of the mold by blowing air into the parison. A transfer mark of the concave portion transferred to the outer edge of the first portion is defined as a convex portion 71. Even in the self-supporting bag 10 of the third embodiment, the same effects as the self-supporting bag 10 of the second embodiment are exhibited.

(Example 4)
In the fourth embodiment, a locking portion 80 that is substantially the same as the locking portions 50 to 70 described above is configured by two thin protruding pieces 81 and 81 adjacent to each other as shown in FIG. Each of the thin-walled overhanging pieces 81, 81 is used by being hooked on the edge of the mouth portion 2 of the refill destination container 1.

(Example 5)
In the fifth embodiment, a locking portion 90 that is substantially the same as the above-described locking portions 50 to 70 is configured by one thin overhanging piece 91 as shown in FIG. The upward edge 92 is used by being hooked on the edge of the mouth portion 2 of the refill destination container 1.

  The thin overhanging pieces 81 and 91 of Examples 4 and 5 are formed by using a mold having a recess corresponding to the thin overhanging pieces 81 and 91, or one of the parisons between the mating surfaces of the left and right molds. It can be configured by a method of forming a burr by sandwiching the part and cutting the outer edge of the burr after opening the mold.

  In the present invention, the bag body of the self-supporting bag may have a top surface portion in addition to the trunk portion and the bottom portion. A bottom portion is continuously provided at the lower end of the trunk portion, and a top surface portion is continuously provided at the upper end of the trunk portion.

FIG. 1 is a schematic view showing a self-supporting bag of Example 1. FIG. FIG. 2 is a cross-sectional view showing a main part of FIG. 3 is a perspective view showing a self-supporting bag of Example 2. FIG. FIG. 4 is a schematic view showing a main part of the self-supporting bag. FIG. 5 is a schematic view showing a state in which the content agent is poured out from the self-supporting bag. FIG. 6 is a schematic view showing a self-supporting bag of Example 3. FIG. 7 is a schematic view showing a self-supporting bag of Example 4. FIG. 8 is a schematic view showing a self-supporting bag of Example 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Self-supporting bag 11 Bag main body 13 Hatch hole formation part 14 Planned cutting line 20 Trunk part 24 Spout formation part 24A Spout 30 Bottom part 50, 60, 70, 80, 90 Locking part

Claims (1)

It is a self-supporting bag that is formed by molding a synthetic resin bag body, and the bag body can be folded at the stage before filling the bag body with the contents,
The self-supporting bag which provided the latching | locking part which can be latched to a pouring destination container in the vicinity of the spout in a bag main body.

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