JP4877492B2 - Self-supporting bag type blow molding volume reduction container - Google Patents

Description

Detailed Description of the Invention

  The present invention relates to a standing pouch type blow molding volume reduction container.

Standing pouches are deformable bag-like soft containers, and are often produced and used together with hard containers such as bottles as containers for storing liquid contents.
In the conventional standing pouch, the front piece and the back piece made of a soft flexible film are side-sealed at both edges to form a body portion, and the bottom piece is also folded into two bottom pieces, and the front piece and the back piece A standing pouch having a self-supporting property is formed in which a bottom portion that can be developed by being heat-sealed at one edge portion and configured to house a content storage chamber is provided. Standing pouches constructed in this manner generally contain contents such as liquids, such as detergents, bleaches, softeners, laundry glue, shampoos, rinses, or edible oils, soy sauce, sauces, dressings, drinking water and the like.
This standing pouch has the great advantage that it can be reduced in volume by folding and flattening in the empty container state before filling the contents or after use. Recently, it has been increasingly important. Recently, blow molded containers simulating such standing pouches have been developed (see Patents 1 to 8).
Patent No. 2525274 JP-A-6-312734 JP 7-267234 A JP-A-10-167242 JP 2004-175406 A JP 2005-67672 A JP 2005-187036 A JP 2006-21787 A JP-A-2005-96825

Standing pouches using blow-molded containers are superior to conventional standing pouches that heat-seal films in that they have fewer manufacturing steps.
However, the conventional blow molding standing pouch is folded into a flat shape, and the shape of the body does not become a substantially rectangular shape with both sides aligned in parallel. When the container is packed and transported in a box or discarded, the accommodation becomes worse. Therefore, technology for folding volume reduction of blow molded pouches has been developed.
The technique described in Patent Document 1 is a blow-molded plastic folding container, and the container has a substantially hexagonal cross-sectional shape, and a folding line is provided between each side. However, the technique of Patent Document 1 has many overlapping portions on each side, and the folded shape does not become flat, and the volume reduction at the time of boxed conveyance is not sufficient.
The technique described in Patent Document 2 is a plastic container that can be folded by blow molding, and is provided with a folding line on a side wall portion and a bottom wall portion that are integrally formed.
However, although the technique of this patent document 2 demonstrates the effect excellent in volume reduction of a container, the container of the folded-up form does not become planar shape.
The technique described in Patent Document 3 is a technique in which a foldable blow-molded bottle has a content in which a front surface and a back surface are connected to each other with a parting line as a boundary and folded into an overlapped shape. However, although the technique described in Patent Document 3 exhibits an excellent effect in reducing the volume of the container, the folded container does not become flat.
The technology described in Patent Document 4 is a hollow container that can be discarded by being folded into a blow-molded container. However, locking irregularities are provided on the inner and outer surfaces of the trunk, and the irregularities for locking are latched in the folded state of the trunk. Thus, the content is to restrain the body portion in the folded posture. However, in the technique according to Patent Document 4, the folded container is not flat.
The technique described in Patent Document 5 relates to a container by a blow molding method and a method for reducing the volume thereof. The container body is provided with a mouth portion, and the container body is kept folded by deaeration from the mouth portion. Technology. However, in the technique of Patent Document 5, it is not easy to handle the container because degassing is necessary for maintaining the attitude of the container body.
The technique described in Patent Document 6 relates to a blow-molded standing pouch suitable as a substitute for a pouch, and forms a filling space between opposing thin flexible walls. However, with the technique of Patent Document 6, the shape of the side wall in the folded state does not become a regular rectangle or a regular rectangle, and the portion near the bottom becomes a wide divergent shape, so that the accommodation at the time of boxing or disposal becomes worse.
The technique described in Patent Document 7 relates to a blow molded standing thin container and a parison for molding the container, and forms a filling space between opposing thin flexible walls. However, even in the technique of Patent Document 7, the shape of the side wall in the folded state does not become a regular rectangle or a regular rectangle, and the portion closer to the bottom becomes a wide divergent shape, so that the accommodation at the time of packaging and disposal becomes worse.
Patent Document 9 describes that it is possible to squeeze the contents by folding in two, but there is no particular suggestion about the form when flattened.
Although the technique described in Patent Document 8 relates to a self-standing bag by blow molding, in the technique of Patent Document 8, the shape of the side wall in the folded state is not a regular rectangle or a rectangle, and the portion near the bottom is wide. Since it becomes a divergent shape, it will not fit well when boxed or discarded.
The next problem is that the standing pouch has a flexible body with flexible components, and the body is flexible enough to change its shape depending on the amount of contents, so it remains in the container body. Depending on the amount of liquid in the tank, the liquid flow through which the residual liquid flows to the spout may be opened or closed, and the residual liquid may not be smoothly poured out. There is a case where a liquid passage rib that bulges outside the body portion to guide the flow and to ensure circulation is formed, but this liquid passage rib inhibits volume reduction when folded. It may also be a restriction on the external appearance design of the container.
For this reason, in a standing pouch by blow molding having a flexible body portion, a technique for ensuring the opening of a liquid passage instead of a rib is desired.
Of the above-mentioned patent documents, the pouch of Patent Document 1 is not particularly devised to ensure the opening of the liquid passage. The pouch described in FIG. 11 of Patent Document 1 describes a nozzle to which a cap 7 is attached, but this nozzle does not function as a member for ensuring the opening of the liquid passage.
The pouch described in Patent Document 2 also includes a hard neck portion 5, but this neck portion does not function as a member for ensuring the opening of the liquid passage.
The pouch described in Patent Document 3 has a relatively large rigidity in the body structure and has a self-holding property, so there is no need to separately form a liquid passage.
The pouch described in Patent Document 4 has a relatively large rigidity in the structure of the body portion and has a self-holding property, so there is no need to separately form a liquid passage.
The pouch described in Patent Document 5 has a nozzle for degassing, but this nozzle does not function as a member for ensuring the opening of the liquid passage.
The pouch described in Patent Document 6 has a soft nozzle, but this nozzle does not function as a member for ensuring the opening of the liquid passage.
The pouch described in Patent Document 7 has a soft nozzle, but this nozzle does not function as a member for ensuring the opening of the liquid passage.
The pouch described in Patent Document 8 has a soft nozzle, but this nozzle does not function as a member for ensuring the opening of the liquid passage.
In patent document 9, the device for ensuring opening of the liquid passage of a nozzle is not made | formed.
For this reason, it is a standing pouch by blow molding, and in the folded state, the body shape becomes a substantially rectangular shape with both sides aligned in parallel, so that it fits well during packaging, and it is also used for liquid passage There is a demand for development of a blow molding standing pouch that can secure a liquid passage that allows communication between the nozzle and the inside of the body without providing a rib.

  The present invention has been made in view of the above circumstances, and the container body in the folded state can have a substantially rectangular shape, and the liquid passage that communicates the container body with the nozzle is surely provided. It is an object of the present invention to provide a blow molded standing pouch that can be formed into a single piece.

Corresponding to this purpose, it is a blow molded volume-reducing container, having a flexible front part and a back part facing each other across a virtual plane including a container center line constituting the trunk part, and the front part and the A bottom surface portion is disposed between lower end portions of the back surface portion in the container center line direction, and each surface portion is connected to each other surface portion at each edge, and the front surface portion, the back surface portion, and the bottom surface portion. A blow molding volume reduction container having a nozzle portion thicker than a thickness of the barrel portion at an upper end portion in a direction along the container center line. ,
The front portion, the back portion and the bottom portion are flexible, the nozzle portion is configured to be more rigid than the front portion and the back portion, and the liquid passage of the nozzle portion is the content storage chamber. Communicated with
The circumferential length of the cross section of the body portion in the direction perpendicular to the center line along the plane is the same at each position of the body portion, and the contents are stored in the content storage chamber and are independent. The area of the entanglement surface perpendicular to the center line of the front part and the back part is larger in the lower part of the body part than in the upper part, and the shape of the entanglement surface is closer to a circle in the lower part of the body part It is characterized by an elliptical shape in which the major axis is larger toward the upper part of the body part.

    In the self-supporting bag-type blow-molded volume-reducing container of the present invention, (1) the front part, the back part, and the bottom part constituting the trunk part are configured flexibly, so the shape of the container depends on the weight of the content liquid in the container However, at this time, the area of the enveloping surface perpendicular to the container center line of the front part and the back part is larger at the lower part of the trunk part than the upper part. The container is stable and independent. (2) In addition, since the cross-sectional circumference when cut along a plane perpendicular to the central axis is the same for each part of the body part, the container after use (in a folded state before filling) or after the content liquid has been poured out When it is crushed, it becomes a substantially rectangular shape in which both sides of the body are aligned in parallel, and handling during transportation and packaging becomes easy.

  (3) Since the area of the above-mentioned entanglement surface is larger in the lower part of the body part and the circumferential length of the cross section is equal, since the container is closer to the lower part, the size of the horizontal width and the vertical width is closer. Stable and independent in both vertical and horizontal directions. (4) Furthermore, although the thickness of the container is reduced in the upper part of the body part, the rigid nozzle is integrated with the front part and the rear part to constrain those parts. Since the maintained posture is maintained, the liquid passage from the container body to the nozzle is kept open. In addition, since the total width of the front and back parts is the same, the posture when the empty container is crushed before use or after the liquid content has been poured out is rectangular, making it easy to handle during transportation and packaging. Become.

Hereinafter, details of the present invention will be described with reference to the drawings showing an embodiment.
In FIG. 1, 1 is a self-supporting bag-type blow-molded volume reduction container (hereinafter abbreviated as “standing pouch”).
The material of the standing pouch 1 is not particularly limited, but is a pouch mainly made of polyethylene, polypropylene, or the like by direct blow molding, and includes three parts, a film-like front part 2, a back part 3, and a bottom part 4, respectively. Furthermore, it consists of a nozzle portion 5.
The front part 2, the back part 3 and the bottom part 4 are configured flexibly, and the front part 2 and the back part 3 are located facing each other across a virtual plane 7 including the center line 6 of the pouch, and the trunk part of the pouch 8, and a portion corresponding to the bottom of the pouch at the lower end of the body portion 8 is provided in a state where the bottom surface portion 4 is folded in two on the front surface portion 2 and the back surface portion 3. The front surface portion 2, the back surface portion 3, and the bottom surface portion 4 are continuous with other surface portions adjacent to each other at the edge portions. The body portion 8 constitutes a content storage chamber 12 surrounded by the front and back side portions 2 and 3 and the bottom surface portion 4. The nozzle portion 5 is configured to be thicker than the front portion 2 and the rear portion 3 as necessary using a technique for partially thickening as shown in JP2001-113589A and JP2003-111523A. Also, the rigidity is large. The skirt portion 11 of the nozzle portion 5 is greatly extended downward, and is integrally connected so as to erode the front portion 2 and the back portion 3. Since the rigidity of the nozzle part 5 and the skirt part 11 is large, the positions of the thin and flexible front part 2 and the back part 3 of the part connected to the skirt part 11 and the peripheral part thereof are restrained by the nozzle part 5 and the skirt part 11. The posture of the state where the interval is opened is maintained, and thereby, the liquid passage 13 for communicating the content storage chamber 12 and the nozzle portion 5 is secured between the front portion 2 and the rear portion 3.
Note that the rigidity of the skirt portion 11 is larger than that of the body portion and smaller than that of the nozzle portion 5 because the flexibility of the skirt portion 11 and the liquid passage can be satisfied.
As shown in FIG. 2, the portion 9 located near the center of the body portion 8, that is, the portion that is separated from the nozzle portion 5 and the bottom surface portion 4, of the body portion 8 composed of the opposed front portion 2 and back portion 3. , The circumferential length of the cross section of the front portion 2 and the back portion 3 in the direction perpendicular to the center line 6 along the virtual plane 7 is in the vertical direction (center line 6) of the trunk portion 8 of the standing pouch 1. It is constant for a vertical cross section. In addition, the standing pouch in the state in which the contents shown in FIGS. 1 and 3 are accommodated has a tangential surface S (S1, S2) orthogonal to the center line 6 of the front portion 2 and the rear portion 3 in the portion 9 near the center. , S3) has an entangling surface S3 in the lower part of the body part 8 that is close to a circle compared to the entangling surface at other positions, and has the largest area. S2 has an oval shape with a major axis larger than that of the enveloping surface S3, a minor axis smaller and an area smaller than that, and the entangling surface S1 in the upper part of the body portion 8 is compared with the entangling surface S2. Furthermore, the long axis is configured to have an elliptical shape with a large short axis and a small short axis.
In the standing pouch 1 configured as described above, the shape of the standing pouch 1 changes such that the bottom expands in accordance with the weight of the content liquid in the content storage chamber 12, and has a self-supporting property.
At this time, since the area of the entanglement surface of the front part 2 and the back part 3 is larger at the lower part of the body part 8 than the upper part and has sufficient thickness (vertical width), the standing pouch 1 is Stable and independent.
Further, in the upper part of the body part, the flexible front part 2 and the rear part 3 having a small rigidity are opposed to each other with a gap from the nozzle part 5 having a large rigidity. Regardless of the amount of the content liquid, the liquid passage 13 communicating the nozzle portion 5 and the storage chamber 12 can be maintained in the open state.
Further, the circumferential length of the cross section is the same over the whole body in the height direction of the trunk portion, in particular, the central portion 9 of the standing pouch 1, and the shape of the central portion 9 is completely flat as shown in FIG. When both sides of the side are aligned in parallel, it becomes a substantially rectangular shape and is easy to handle during transportation and packaging.
Further, as shown in FIG. 1, when seen from the front of the trunk, both sides of the side are widened with an outwardly outward curve, so that both sides of the front and rear surfaces are curved with an upward inner recess when viewed from the side. By narrowing and narrowing the upper end of the shoulder, it is easy to fit the shoulder flat, and it is possible to obtain a container that can be flattened and both sides are parallel after being crushed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the standing pouch 1 of this invention, (a) is a front view, (b) is a side view, (c) is a top view, (d) is a bottom view. It is a figure which shows the outline of the trunk | drum in the cross section of each part of FIG. 1, (a) is outline explanatory drawing of AA section sectional drawing, (b) is outline explanatory drawing of BB section sectional drawing, (c) is It is outline explanatory drawing of CC section sectional drawing. Perspective explanatory view showing the standing pouch 1 when fully filled Perspective explanatory view showing the standing pouch 1 when folded

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Standing pouch 2 Front part 3 Back part 4 Bottom part 5 Nozzle part 6 Center line 7 Virtual plane 8 Trunk part 9 Center part 11 Bottom part 12 Content storage chamber 13 Fluid passage

Claims (3)

A blow molded volume-reducing container, having a flexible front portion and a back portion facing each other across a virtual plane including a container center line constituting the trunk portion, and the container center lines of the front portion and the back portion A bottom surface portion is disposed between the lower end portions in the direction, and each surface portion is continuous with each other surface portion at each edge, and the contents are placed between the front surface portion, the back surface portion, and the bottom surface portion. A blow-molded volume-reducing container having a nozzle portion that is thicker than the thickness of the barrel portion at the upper end portion in the direction along the container center line, in which a content storage chamber is formed,
The front portion, the back portion and the bottom portion are flexible, the nozzle portion is configured to be more rigid than the front portion and the back portion, and the liquid passage of the nozzle portion is the content storage chamber. Communicated with
The circumferential length of the cross section of the body portion in the direction perpendicular to the center line along the plane is the same at each position of the body portion, and the contents are stored in the content storage chamber and are independent. the front section and the area of抱絡plane perpendicular to the center line of the back part is rather larger than towards towards the lower torso of the upper, and the shape of the抱絡face the circular direction of the lower body portion A self-supporting bag-type blow-molded volume-reducing container characterized in that an oblong shape having a larger major axis becomes closer to the upper part of the body part .   2. The self-supporting bag-type blow according to claim 1, wherein a skirt portion of the nozzle portion is integrally formed with the front portion and the back portion in a state where the bottom portion of the nozzle portion is eroded by a part of the front portion and the back portion. Molded volume reduction container.   The self-standing bag-type blow molded volume reduction container according to any one of claims 1 and 2, wherein an easy-bending line is formed at a continuous portion of a boundary between the front portion and the back portion.

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