JP4934182B2 - Manufacturing method of free-standing bags - Google Patents

Description

  The present invention relates to a method for manufacturing a self-supporting bag.

  As a method for producing a synthetic resin container, as described in Patent Document 1, a parison is blown from a blowing needle hole in a mold, and the needle hole is heated and sealed while maintaining the shape of the molded product. There are some that prevent foreign matter from entering the molded product.

  As another method for producing a synthetic resin container, as described in Patent Document 2, a parison is blown from an air blowing opening in a mold, and the opening is sealed while maintaining the shape of the molded product. Some prevent foreign matter from entering the product.

JP-B 54-37636 (pages 1 and 2, Fig. 7 and Fig. 8) JP 3-66141 (2 pages, Fig. 6 to Fig. 9)

  In Patent Documents 1 and 2, the molded product is sealed in a state in which the shape is maintained to be an empty container, and the storage efficiency and transport efficiency of the empty container are poor. Also, because there is a lot of air in the container, the volume increase when the storage temperature rises is large, and there is a disadvantage that the container deforms or the box swells when packed in the box, and conversely when the storage temperature falls Has the disadvantage that it is deformed under reduced pressure and the dents cannot be restored.

  According to Japanese Patent Application No. 2002-206187, the present applicant aims to improve the storage efficiency and emptying efficiency of empty bags in a self-supporting bag, and molds the bag body made of a synthetic resin to the bag body. Proposals have been made to make the bag body foldable before filling the contents.

An object of the present invention is to maintain the self-standing bag, empty bags storage efficiency, improved transport efficiency and the sterility of the inner container to prevent or content agent filling stage of foreign material from entering the air bag, further contents It is to improve the filling efficiency by improving the filling property of the agent and the opening and resealability of the bag body during filling .

In the invention of claim 1, the bag body made of synthetic resin is blow-molded in a mold , the entire molded bag body is folded, and the air blowing opening of the folded bag body is fused and sealed. At the time of filling, the fusion sealed seal part of the bag body is cut to form a filling port, and then the bag body is inflated and filled with a content agent from the filling port of the bag body. The remaining part of the cut seal part of the bag body is heat-sealed with a heat-sealing tool to seal the filling port .

According to the present invention, in a self-supporting bag, the storage efficiency and emptying efficiency of the empty bag are improved, and the aseptic condition inside the container is maintained until the foreign substance enters the empty bag or until the content agent filling stage. The filling efficiency can be improved by improving the agent filling property and the opening and resealability of the bag body during filling.

FIG. 1 is a perspective view showing a self-supporting bag. FIG. 2 is a perspective view showing an example of a folded state of the self-supporting bag. FIG. 3 is a schematic diagram showing a manufacturing process of a self-supporting bag. FIG. 4 is a schematic diagram showing a manufacturing stage of a free-standing bag. FIG. 5 is a schematic view showing an empty bag conveyance stage of a self-supporting bag. FIG. 6 is a schematic view showing another example of a manufacturing process of a self-supporting bag.

  As shown in FIG. 1, the self-supporting bag 10 is obtained by blow molding a synthetic resin bag body 11 including a body portion 20 and a bottom portion 30 into a three-dimensional shape (three-dimensional shape), and before filling the bag body 11 with a content agent. Thus, the entire bag body 11 can be folded.

  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.

  The bag body 11 has a body portion 20 consisting of a front surface portion 20A, a back surface portion 20B, and both side surface portions 20C. By blow molding, a ridge line portion 41 is provided at the boundary between the front surface portion 20A and the both side surface portions 20C. A ridge line portion 42 is provided at the boundary of the surface portion 20C, a ridge line portion 43 is provided at the boundary between the front surface portion 20A and the bottom portion 30, a ridge line portion 44 is provided at the boundary between the back surface portion 20B and the bottom portion 30, and the boundary between the side surface portions 20C and the bottom portion 30 is provided. A ridge portion 45 is provided. Further, the bag body 11 is provided with a ridge line part 46 along the parting line of the blow molding die at the center part along the longitudinal direction of the both side surface parts 20C, and the parting line of the blow molding die also at the center part of the bottom part 30. A ridge line portion 47 (shown in FIG. 2) is provided.

  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.

  The self-supporting bag 10 can mold the spout forming part 24 for forming the spout 24A in a part of the upper edge side of the body part 20 at the time of blow molding. The spout 24A is formed by cutting the spout forming part 24.

  The self-supporting bag 10 folds the entire bag body 11 as follows, for example (FIG. 2). A substantially planar folding form in which the body portion 20 is flattened, the entire flat bottom portion 30 is bent with respect to the lower portion of the body portion 20, and the bottom portion 30 is folded in parallel with the body portion 20. There are those that project the ridge line portions 46 of the side surface portions 20C to the outside of the trunk portion 20 (FIG. 2A) and those that are folded inside the barrel portion 20 (FIG. 2B). The total thickness of the self-standing bag 10 in which the ridge line portion 46 projects outward is thinner.

  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.

  Hereafter, the manufacturing procedure of a self-supporting bag is demonstrated (FIG. 3, FIG. 4). The self-supporting bag 10 is manufactured by the following procedure in a manufacturing line as schematically shown in FIG.

(1) Molding process of bag body 11 (FIGS. 3A and 4)
The bag body 11 made of synthetic resin can be manufactured by direct blow molding. In the direct blow molding, the bag body 11 is formed by extruding a parison into a mold 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), L-LDPE (linear low density polyethylene) or HDPE (high density polyethylene) can be adopted in the case of a single layer, and outside when laminated. The layer may be HDPE, the inner layer may be LDPE or L-LDPE, and the inner layer may be HDPE and the outer layer may be LDPE.

  The molded bag body 11 includes a cylindrical neck portion 12 having an air blowing opening 12 </ b> A at the tip thereof and connected to the upper portion of the filling port forming portion 22.

(2) Folding process of bag body 11 (FIG. 3 (B), FIG. 4)
A vacuum suction tool 51 is inserted into the air blowing opening 12A of the formed bag body 11, the internal pressure of the bag body 11 is reduced, the bag body 11 is reduced, and the bag body 11 is folded flat. The folding form of the bag body 11 is, for example, as shown in FIG.

  In addition, the bag main body 11 may be pressed and reduced in volume by applying external force, and may be folded flat.

(3) Leak inspection process of bag main body 11 In the process of depressurizing bag main body 11 in the above step (2), the degree of pressure reduction is checked by a pressure gauge or the like provided in the piping system of vacuum suction tool 51. Perform a leak test.

(4) Sealing process of the bag body 11 (FIG. 3C, FIG. 4)
The air blowing opening 12 </ b> A is sealed while maintaining the volume reduction state of the folded bag body 11. In this embodiment, the base part connected to the filling port forming part 22 of the cylindrical neck part 12 is heat-sealed by the heat seal tool 52 to form the seal part 12B, and the upper part from the seal part 12B is cut and removed.

(5) Decoration process of the bag body 11 (FIGS. 3D and 4).
The bag body 11 sealed in the folded state is conveyed to the decoration process, and the label A is attached to the surface of the bag body 11 and printed.

Next, the procedure for using the self-supporting bag 10 is as follows. (FIGS. 3 and 5).
(1) The self-supporting bag 10 manufactured in the above-described manufacturing line is packed in a box 53 and stored in a flat stack.

  (2) The self-supporting bag 10 is supplied from the box 53 to the transport line 54 and transported, put into the bag-shaped bag holder 55, and transported to the filling machine.

  (3) The self-supporting bag 10 that has reached the filling machine is cut at the filling port forming part 22 (seal part 12B) of the bag main body 11 and the filling port 22A is opened (FIG. 3E). Subsequently, the bag body 11 is inflated three-dimensionally, and after filling the content agent from the filling port 22A, the filling port 22A is sealed (FIG. 3F). The remaining part of the filling port forming part 22 is heat-sealed with a heat sealer to form a seal part 22B.

According to this embodiment, there exist the following effects.
(a) A flexible bag main body 11 made of synthetic resin is blow-molded in a three-dimensional shape (three-dimensional shape), the formed bag main body 11 is folded, and the opening 12A of the bag main body 11 is sealed. 11 can be stored and transported while maintaining the folded state, and the bag body 11 is inflated in a three-dimensional shape to be self-supporting when the contents are filled. The bag body 11 is reduced in volume by folding, so that storage efficiency and transport efficiency can be improved.

(b) By sealing the opening 12A of the bag body 11 folded in (a ) above, it is possible to prevent foreign matter from entering the empty bag during storage and transport in the empty bag state.

After the blow molding of the bag main body 11 in the above (a) , the sterilized state inside the bag can be maintained until the filling stage of the content agent by quickly sealing the opening 12A.

(c) Since the volume reduction state of the bag body 11 folded in the above (a) is maintained by the seal portion 12B and does not swell, the presence or absence of pinholes in the bag body 11 can be confirmed.

(d) The bag body 11 is made thin and flexible by blow molding, so that the amount of resin used can be reduced and can be stably stored in flat stacks as compared to conventional hard-molded bottles or bags bonded with films. .

(e) By reducing the internal pressure of the bag body 11 with the vacuum suction tool 51, the molded bag body 11 can be quickly folded.

(f) In the process of depressurizing the bag main body 11 described in (e ) above, the leak inspection of the bag main body 11 can be easily performed by checking the degree of depressurization.

(g) By pressing the bag body 11, the formed bag body 11 can be easily folded.

FIG. 6 is a modification of the manufacturing procedure and the usage procedure shown in FIG.
The manufacturing procedure of the self-supporting bag 10 in FIG. 6 is different from that in FIG. In the sealing process of the bag body 11, as shown in FIG. 6C, the air blowing opening 12A at the tip of the cylindrical neck portion 12 was heat-sealed to form a seal portion 12B. Therefore, it is not necessary to cut and remove the upper portion of the seal portion 12B in the sealing process of the bag body 11, and in the transfer process, the tubular neck is held in a bowl shape by gripping the cylindrical neck portion with a robot arm or the like. It is also possible to put it in the tool reliably.

  In the procedure of using the self-supporting bag 10 in FIG. 6, when the filling port forming portion 22 of the bag body 11 is cut and the filling port 22A is opened and formed in the filling machine, as shown in FIG. The part 12 is cut and removed.

In addition, in the self-supporting bag 10, there exist the following effects.
(1) The filling port forming portion 22 of the content agent into the bag body 11 can be provided over the entire width of the upper portion of the trunk portion 20 of the bag body 11 or near the full width, and the filling property of the content agent is good.

  (2) The spout forming part 24 for the content agent from the bag body 11 is formed as a part of the body part 20 when the bag body 11 is blow-molded, or is an 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.

  (3) Since the bag body 11 is blow-molded, the film cutting and film sealing required in the conventional free-standing bag can be greatly omitted, and the manufacturing process is simple.

  (4) Since the bag body 11 is not configured by bonding sheets, it is not always necessary to configure the bag body 11 with a laminated resin with an adhesive layer interposed. Therefore, the bag main body 11 can be constituted by a single layer resin, and the content agent containing a surfactant or a solvent does not penetrate into the adhesive layer of the laminated film to cause the peeling of the laminated resin, thereby stabilizing the bag quality. Can be achieved.

  (5) 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.

  (6) 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.

  (7) Since the spout forming part 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.

According to the present invention, in a self-supporting bag, the storage efficiency and emptying efficiency of the empty bag are improved, and the aseptic condition inside the container is maintained until the foreign substance enters the empty bag or until the content agent filling stage. The filling efficiency can be improved by improving the agent filling property and the opening and resealability of the bag body during filling.

10 Self-standing bag 11 Bag body 12A Opening 12B Heat seal part 22A Filling port 22B Seal part

Claims (5)

Blow molding the synthetic resin bag body in the mold ,
Fold the entire molded bag body,
Stored with the air blowing opening of the folded bag body fused and sealed,
At the time of filling, the fusion sealed seal part of the bag body is cut to form a filling port, and then the bag body is inflated.
A method for producing a self-supporting bag , wherein after filling a content agent from a filling port of a bag body, the remaining part of the cut seal part of the bag body is heat-sealed with a heat sealer, and the filling port is sealed. The manufacturing method of the self-supporting bag according to claim 1 , wherein the inner pressure of the bag body is reduced and folded. The method for manufacturing a self-supporting bag according to claim 2 , wherein in the process of decompressing the bag body, the bag body is inspected for leak by checking the degree of decompression. Method for producing a self-standing bag according to claim 1, folded by pressing the bag body. The self-supporting bag manufactured by the manufacturing method of the self-supporting bag in any one of Claims 1-4 .

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