JP4210102B2 - Self-supporting bag - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible freestanding bag.
[0002]
[Prior art]
Although there exists what attaches a label to the surface of a hard bottle (patent document 1), the amount of resin used for a hard bottle is large, and a large storage space is required from the stage before filling the contents into the bottle body.
[0003]
On the other hand, as a self-supporting bag, there is one in which a flexible bag body is formed by laminating a front and back synthetic resin body sheet and a synthetic resin bottom sheet. 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 bag body with the content agent (Patent Document 2). In a self-supporting bag, it can be attached by, for example, printing a label on the surface of the body part sheet before pasting.
[0004]
[Patent Document 1]
JP 2002-53115 (2 pages, Fig. 2)
[0005]
[Patent Document 2]
Patent 3077751 (3 pages, Fig. 2)
[0006]
[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.
[0007]
(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 filling with the contents agent, the body part is wrinkled to give the bag body an aesthetic appearance. To lose.
[0008]
(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.
[0009]
(4) The bonding intersection of the body sheet and the bottom sheet is weak against the impact of dropping and easily cracked.
[0010]
{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.
[0011]
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 contents into the bag body. Has proposed.
[0012]
However, in a self-standing bag that is molded, if you try to attach the label to the molded bag body before filling the contents, and press the label against the three-dimensional bag body, the bag body Will deform and the label cannot be reliably attached to the correct position.
[0013]
An object of the present invention is to easily and reliably attach a label to a molded bag body in a self-supporting bag. At the same time, the manufacturing process is simplified, the bag quality is stabilized, the drop strength is improved, and the spout is secured.
[0014]
[Means for Solving the Problems]
The invention according to claim 1 is a self-supporting bag formed by molding a synthetic resin bag body made of a body part and a bottom part, and enabling the bag body to be folded before filling the contents of the bag body. The bag body has a three-dimensional shape, and is formed in plane symmetry with respect to a central plane sandwiched between the front portion and the back portion of the trunk portion in a cross section of the trunk portion including a label attaching planned portion in the bag body. Then, after the bag body is molded, the back part is reversed so as to be pushed in, the front part and the back part are overlapped, and the label is attached to the label attaching planned part on the front part, thereby forming the label attaching planned part on the front part. A label is attached via an adhesive.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
First Embodiment (FIGS. 1 to 3)
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. The bag body 11 can be folded.
[0016]
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.
[0017]
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.
[0018]
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 spout 24A is formed by cutting the spout forming part 24.
The self-supporting bag 10 can be manufactured by direct 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]
The self-supporting bag 10 can be formed by folding the bag body 11 such that the bottom portion 30 is overlapped with the trunk portion 20 as shown in (a) or (b) below.
[0021]
(a) A form in which the body part 20 is flattened and the flat bottom part 30 is bent with respect to the lower part of the body part 20.
[0022]
(b) 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.
[0023]
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.
[0024]
However, in the self-supporting bag 10, a circle which is a half part on the front side of the trunk portion 20 in the substantially elliptical cross section (FIG. 2A) of the trunk portion 20 including the label attachment scheduled portion in the bag body 11. The arc-shaped front portion 20A and the arc-shaped back portion 20B, which is a half on the back side, are symmetrical with respect to the central surface of the bag body 11 sandwiched between them. Furthermore, the trunk | drum 20 has the ridgeline parts 41 and 42 in alignment with the parting line of a blow molding metal mold | die in the left-right boundary of the front part 20A and the back part 20B.
[0025]
In the self-supporting bag 10, when the label L is to be attached to the surface of the front portion 20A of the trunk portion 20, as shown in FIG. 2 (B), the bag body is reversed so as to push the back portion 20B toward the front portion 20A. 11 in the folded state, the front portion 20A and the back portion 20B are overlapped, the back portion 20B is covered with the arc-shaped support surface 51 of the bag support base 50, and the label L is pasted on the surface of the front portion 20A through an adhesive or the like. wear.
[0026]
The self-supporting bag 10 has the following effects.
{Circle around (1)} In the cross section of the trunk portion 20 including the label attachment scheduled portion in the bag body 11, the front portion 20A and the rear portion 20B of the trunk portion 20 are symmetrical with respect to the central plane sandwiched between them. Therefore, when the front portion 20A and the back portion 20B of the trunk portion 20 are overlapped in the folded form of the bag body 11, the back portion 20B can be brought into close contact with the inner surface of the front portion 20A. If the support surface 51 of the support base 50 is covered, the front portion 20A is backed up to the support base 50 via the back portion 20B without any gap, and the label L is attached to the surface of the front portion 20A via an adhesive or the like. Can be pasted. Therefore, the label can be easily and reliably attached to the correct position of the trunk portion 20 without deformation of the trunk portion 20 (the front portion 20A and the rear portion 20B) in the bag body 11.
[0027]
(2) In the body part 20 of the bag body 11, the front part 20A and the back part 20B that overlap as described in the above (1) have the ridge lines 41 and 42 at the boundary between them, so that the front part 20A and the back part 20 are It comes into close contact with the ridge line portions 41 and 42 without deviation. Therefore, the front part 20A is attached with a label in a state where it is backed up on the support base 50 through the back part 20B with no gap and without deviation.
[0028]
In addition, when the front part 20A and the back part 20B of the trunk part 20 do not have plane symmetry as shown in FIG. 3, when the front part 20A and the back part 20B are overlapped with each other, The portion 20B cannot be brought into close contact with each other, and a gap is generated between the two. The front part 20A is backed up by the support base 51 through a gap with the back part 20B. When the label is pressed against the surface of the front part 20A, the front part 20A is deformed and the label cannot be attached to the correct position.
[0029]
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.
[0030]
(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.
[0031]
(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.
[0032]
(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.
[0033]
(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.
[0034]
(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.
[0035]
(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.
[0036]
(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.
[0037]
(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.
[0038]
(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.
[0039]
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.
[0040]
Second Embodiment (FIGS. 4 and 5)
The difference between the self-supporting bag 10 of the second embodiment and the self-supporting bag 10 of the first embodiment is that the cross section of the trunk portion 20 including the label attachment scheduled portion in the bag main body 11 is square (in this embodiment, hexagonal). (FIG. 4, FIG. 5 (A)).
[0041]
The body portion 20 of the self-supporting bag 10 includes a front portion 20A, a back portion 20B, and both side surface portions 20C, and a blow molding mold parting line at a central portion (center surface of the bag body 11) along the longitudinal direction of the both side surface portions 20C. And the half which is divided by the ridge line portions 41 and 42 of the planar front portion 20A and the side surface portions 20C which are half portions on the front side of the trunk portion 20, and the plane which is the half portion on the back side. The back surface portion 20B and the half of the side surface portions 20C defined by the ridge line portions 41 and 42 are plane-symmetric with respect to the central surface of the bag body 11 sandwiched between them. Furthermore, the trunk | drum 20 has the ridgeline part 43 in the boundary of the front part 20A and the both-sides surface part 20C by blow molding, and has the ridgeline part 44 in the boundary of the back surface part 20B and the both-sides surface part 20C.
[0042]
In the self-supporting bag 10, when trying to attach the label L to the surface of the front part 20 </ b> A of the trunk part 20, as shown in FIG. 5B, the bag body reverses so as to push the back part 20 </ b> B toward the front part 20 </ b> A. 11, the front part 20A and the rear part 20B are overlapped, and half of the rear part 20B and both side parts 20C are placed on the square support surface 51 of the bag support base 50, and an adhesive is applied to the surface of the front part 20A. The label L is affixed by, for example.
[0043]
Therefore, even if it exists in the self-supporting bag 10 of 2nd Embodiment, it has the following effects similarly to the self-supporting bag 10 of 1st Embodiment.
[0044]
{Circle around (1)} In the cross section of the trunk portion 20 including the label attachment scheduled portion in the bag body 11, the front portion 20A and the rear portion 20B of the trunk portion 20 are symmetrical with respect to the central plane sandwiched between them. Therefore, when the front portion 20A and the back portion 20B of the trunk portion 20 are overlapped in the folded form of the bag body 11, the back portion 20B can be brought into close contact with the inner surface of the front portion 20A. If the support surface 51 of the support base 50 is covered, the front portion 20A is backed up to the support base 50 via the back portion 20B without any gap, and the label L is attached to the surface of the front portion 20A via an adhesive or the like. Can be pasted. Therefore, the label can be easily and reliably attached to the correct position of the trunk portion 20 without deformation of the trunk portion 20 (the front portion 20A and the rear portion 20B) in the bag body 11.
[0045]
(2) In the body part 20 of the bag body 11, the front part 20A and the back part 20B that overlap as shown in the above (1) have the ridge parts 43 and 44, so that the ridge parts 43 and 44 are engaged with each other. Thus, the front portion 20A and the back portion 20B can be brought into close contact with each other without deviation. Accordingly, the front portion 20A is attached with the label L in a state where it is backed up to the support base 50 through the back portion 20B with no gap and without deviation.
[0046]
【The invention's effect】
According to the present invention, in a self-supporting bag, a label can be easily and reliably attached to a molded bag body. At the same time, it is possible to simplify the manufacturing process, stabilize the bag quality, improve the drop strength, and ensure the stability of the spout.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a self-supporting bag according to a first embodiment.
FIG. 2 is a cross-sectional view of a trunk portion of a self-supporting bag, (A) is a cross-sectional view showing a front portion and a back portion that are plane-symmetrical, and (B) is a cross-sectional view showing a label application state. .
FIG. 3 shows a comparative example of a cross-section of the trunk portion of a self-supporting bag, (A) is a cross-sectional view showing a front portion and a back portion that are non-plane-symmetric, and (B) shows a state of label attachment. It is sectional drawing.
FIG. 4 is a perspective view showing a self-supporting bag according to a second embodiment.
FIG. 5 is a cross-sectional view of a trunk portion of a self-supporting bag, (A) is a cross-sectional view showing a front portion and a back portion that are plane-symmetric, and (B) is a cross-sectional view showing a label application state. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Self-supporting bag 11 Bag main body 20 Body part 20A Front part 20B Rear part 20C Side part 41, 42, 43, 44 Ridge part
L label

Claims (4)

It is a self-supporting bag that is formed by molding a bag body made of a synthetic resin consisting of a trunk portion and a bottom portion, and the bag body can be folded at the stage before filling the contents of the bag body,
The bag body is three-dimensional,
In the cross section of the body part including the label attaching planned part in the bag body, the front part and the back part of the body part are formed symmetrically with respect to the central surface sandwiched between them,
After forming the bag body, the back part is reversed so as to be pushed in, the front part and the back part are overlapped, and a label is attached to the label attaching planned part of the front part , thereby the adhesive to the label attaching planned part of the front part A self-supporting bag with a label attached. The self-supporting bag according to claim 1 , wherein each of a front portion and a rear portion of the trunk portion of the bag body has a ridge line portion. Consists body portion and the front portion and the rear portion and both side surfaces of the bag body, the boundary between the front portion and both side surfaces, according to claim 2 formed by providing the ridge portions in the respective boundaries of the rear portion and both side surface portions Free-standing bag. A method for producing a self-supporting bag that is molded and made to be able to fold a synthetic resin bag body made up of a trunk and a bottom,
The bag body is three-dimensional,
After mold forming, the front and back of the bag body are folded so that they are in close contact with each other, and the folded bag body is backed up to the bag support base, and a label is attached to the front part via an adhesive. Manufacturing method .

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