JPH10129641A - Easily collapsible synthetic resin poligonal hollow container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a heat-resistant square hollow container made of polyethylene terephthalate which can be easily collapsed and doubly folded to the diagonal direction of the side wall of the vacant container and which can be compacted by folding the bottom at the time of disposing it. SOLUTION: In a square hollow container whose square colamnar four corners are beveled, recessed grooves 7, 7a of reinforcing ribs are linearly formed in the lateral direction, at the waist part of the middle of the main wall 2 composed of the front and rear walls and the right and left side walls of the container, and a pair of diagonal wall faces 3a of the beveled corner walls. Both ends of the recessed grooves of the reinforcing ribs are made shallow and the grooves are dissipated at the flat face of the corners, at the remaining other pair of diagonal wall faces of the beveled corner walls. In this way, a pair of easily deformable flat faces with ribs and a pair of hardly deformable falt faces without ribs are formed at the beveled corners of the square hollow container, and the part with ribs is squashed inward and doubly folded to make the container compressively deformable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow container obtained by biaxially stretch-blowing a thermoplastic synthetic resin, and more particularly to a polygonal shape made of a polyethylene terephthalate resin suitable for filling contents by heat sterilization. The present invention relates to a hollow container which can be easily crushed at the time of disposal.

[0002]

2. Description of the Related Art In recent years, polyethylene terephthalate (P)
ET) Hollow containers formed by biaxially stretch-blown resin are widely used as containers suitable for filling contents that require high-temperature heat sterilization, such as juices, soft drinks, and other beverages. ing. When such hollow containers are frequently used, the ratio of PET resin containers to general garbage that is discarded from daily life increases, causing social pollution and other problems. It has become necessary to collect these empty containers and reuse them as resources.

[0003] In recent years, with the change of lifestyle, mineral water, alcoholic beverages, soft drinks, sports drinks, health drinks and the like have been consumed in large quantities, and as a result, they are lightweight, hard to break, and have no pollution. In addition, large containers made of PET resin have come to be frequently used from the viewpoint of excellent transparency and mechanical strength. However, in such a large PET resin container, internal residual stress is generated at the time of molding by a normal biaxial stretch blow molding method, and thermal deformation is likely to occur at the time of high-temperature heating filling or high-temperature heating sterilization. In order to prevent deformation of the container due to heat and residual stress, heat-setting is performed during the molding process, reinforcing ribs with band-like irregularities are formed around the side wall of the container, and absorption of internal pressure changes is mitigated. Deformable wall (panel wall)
Is provided to prevent deformation of other parts of the side wall.Empty containers are difficult to compress and deform and take up a large volume at the time of disposal, so it is difficult to collect efficiently. there were.

A typical large PET resin container is a generally octagonal column-shaped hollow container in which a square corner is slightly cut off, and a groove provided around a middle wall of a body wall. Panel walls are provided above and below the reinforcing ribs of the strip, and the depth of the groove is formed deeper from the corner to the center, so that the strength of the entire peripheral wall of the container is uniformly increased. (See Japanese Utility Model Laid-Open Publication No. 1-161428) or a rib (waist portion) formed in a circumferential groove shape at a substantially middle portion of a body portion of a cylindrical rectangular container having four corners of a rectangular shape. Is formed deeper than at the corners, and the ribs at the panel wall are formed more stepwise into the bottle body than the ribs at the corners, increasing the rigidity of the container wall and increasing the wall thickness. (Japanese Utility Model No. 5-94112)
No.) are known.

A feature common to these known large polygonal containers is that, as shown in FIGS. 5 and 6, the body of the polygonal bottle-shaped hollow container 1 is formed by chamfering the corners of a square.
The concave groove of the reinforcing rib 7a formed in the middle waist portion is
Reinforcing ribs 7b are formed not only on the main side wall surface 2 but also on the corner wall surface 3 in the same manner as the main wall, and a recessed groove is formed which is continuous with the reinforcing rib 7a on the main side wall surface and is homogeneously integrated to withstand internal pressure. It was done. However, hollow containers with such a structure,
Although it has a certain pressure-resistant strength against external force acting on the main wall surface 2 of the container from the front, it is weak against external force acting at right angles to the corner surface 3 as shown by the arrow, and FIG. As shown by the dotted line, it is easily deformed into a rhombus shape, and particularly when it is subjected to a strong force on the groove-shaped rib surface 7b at the corner portion, it deforms by making a bellows sound, or in a state where containers are stacked vertically. During transportation of the container, there is a drawback that buckling deformation is likely to occur in the ribs provided around the body against vertical compressive load, so the thickness of the body wall of the container can be made too thin. Because of this, such empty containers could not be easily compressed.

Therefore, in response to recent resource and environmental problems and other social demands, in order to collect used empty containers, when discarding unused containers, the volume becomes bulky. As a container with no structure,
As described in JP-A-46717, a folding line portion is provided on the side wall and the bottom of the body of the rectangular hollow container, and when the empty container is discarded, along the folding line, There is one that is folded in a flat shape so that the volume can be easily reduced. However, in the case of the structure that is folded flat as described above, air easily enters the container with the elastic return force of the folded container, so it is difficult to stably maintain the folded state, In order to make the body wall thinner, there is no reinforcing rib on the side wall, so there is a problem in strength.

[0007] As described in Japanese Patent Application Laid-Open No. Hei 7-101442, a discontinuous portion is formed in a screw portion and a neck ring formed in the mouth and neck portion of a container and a push portion is formed in a bottom portion. Forming a concave groove that is depressed inward by pressure, a concave part is formed on one wall surface of the opposing side wall on the body of the container, and a protruding part is formed on the other wall surface opposite to this, in the form of a reinforcing rib The applicant of the present invention has proposed a configuration in which the projection is fitted to the concave portion when folded into a flat shape, and the flat portion can be stably held and discarded. . However, the above-mentioned container can be formed into a thin body wall and can be easily crushed, but simply crushing the container in a flat shape, the surface area thereof remains large, so the volume is reduced, but the outer surface is reduced. However, there is a drawback in that it takes time and effort to store it in a collecting container.

[0008] Therefore, in order to efficiently collect these empty PET resin containers and enable them to be reused as resources, a container in which the volume to be discarded can be easily compressed to reduce the volume is used. As a result of various investigations, to reduce the thickness of the body wall of the container except for the disadvantages described above,
A flat surface obtained by chamfering a corner of a rectangular container as shown in FIG. 5 is formed by forming a pair of wall surfaces and a groove formed with a groove of a reinforcing rib provided in a lateral direction at a central portion (a waist portion) of a side wall of the container. By providing a combination of a pair of wall surfaces formed, the body wall of the container can be made thinner, and the side wall portion of the container is hardly deformed even when an external force is applied, but it has a concave shape at the time of disposal. It has been found that if the flat surface at the corner where the rib is formed is pressed, it can be easily crushed and reduced.

[0009]

In a hollow container having a square cross section, the hollow container has a strong resistance to an external force acting on the side wall surface of the container, and the emptied container has a diagonal side wall. The structure is such that it can be easily crushed into two folds, and is formed into a hollow container which can be discarded with a small volume when discarded.

[0010]

Means for Solving the Problems In a rectangular hollow container in which four corners of a prismatic shape are chamfered, a waist in the middle of a main wall composed of front and rear walls and left and right side walls and a corner in which a corner of the container is chamfered. On a pair of diagonal wall surfaces of the square wall, concave grooves of reinforcing ribs are formed linearly in the lateral direction, and on the other pair of diagonal wall surfaces of the corner wall where the corner of the container is chamfered, the reinforcement is performed. Both ends of the concave groove of the rib are formed so as to be shallow and disappear on the flat surface at the corner, and a pair of flat surfaces with a pair of deformable ribs at the chamfered corner of the rectangular hollow container are formed. And a flat surface without ribs, which is difficult to deform, is provided, and a portion with ribs is crushed inward to form a structure capable of being folded in two.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In a hollow container 1 formed in a prismatic shape with a chamfered corner portion having a rectangular cross section, front and rear walls and left and right sides provided with panel wall portions for absorbing pressure acting on a body wall portion of the container. A reinforcing rib 7 in the form of a groove is formed in a straight line in the lateral direction in the middle waist portion of the main wall 2 composed of the side wall, and a pair of diagonal flat surfaces 3a having chamfered corners is formed on the waist portion. The reinforcing ribs 7a continuous with the concave grooves are formed so that the ends of the concave grooves at the waist portion become shallow and disappear on the remaining pair of diagonal flat surfaces 3b. By forming the body wall portion of the container as described above, the corner surface 3a having the concave groove rib formed on the flat surface having the chamfered corner portion is crushed inward to easily fold the body portion of the container in half. And then
The bottom of the container can be folded inward and made smaller for disposal.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention of the present application will be described based on embodiments with reference to the drawings. As shown in FIGS. 1 and 2, a hollow container 1 having a rectangular cross section composed of a main wall 2 composed of front and rear and right and left side walls is formed by biaxial stretch blow molding of PET resin. The body of the container is formed on flat surfaces 3a and 3b with chamfered corners, and a waist portion is formed in the middle portion of the main wall 2 with a reinforcing rib 7 in the form of a groove in the lateral direction. I do.

The flat surface formed at the corner is
It consists of a pair of flat surfaces 3a formed with ribs 7a so as to be continuous with the reinforcing ribs 7 of the main wall and a pair of flat surfaces 3b not formed with the reinforcing ribs. The surfaces 3a and 3b are formed such that the upper end converges on the mouth and neck 15 via the shoulder 12 of the container, and the lower end reaches the curved surface of the bottom 13 and converges. Further, the main wall 2 of the container is provided with a panel wall 10 having a bottom shape 8 for absorbing a change in internal pressure acting on the side wall of the container at positions above and below the reinforcing rib 7 at the waist portion. The upper and lower portions of the panel wall, that is, the side walls near the shoulder and the bottom of the container are reinforced by providing concave groove ribs 11 having the same length as the width of the panel wall 10.

The structure of the reinforcing rib 7 at the waist, which is a feature of the hollow container 1 of the present invention having the above-described structure, has a cross-sectional structure as shown in FIG. That is,
The groove-shaped ribs 7 formed on the four main wall portions 2 and the pair of flat surfaces 2a at the two corner portions are formed to have the same width and the same depth, but the groove-shaped ribs are formed. In the pair of flat surfaces 3b at the corners that are not formed, both ends of the concave groove rib 7 are formed so as to gradually become shallow and disappear in contact with the flat surface 3b, and are formed at the corners. The flat surface 3b having no rib is formed to be narrower than the flat surface 3a having the rib.

In the container of the present invention having the above-mentioned body structure, the body wall of the container having the pair of flat surfaces 3b on which the reinforcing ribs are not formed acts in the vertical and horizontal directions. It can withstand external force enough,
The body wall of the container having a pair of flat surfaces 3a in which the reinforcing ribs are formed in the shape of a concave groove is weak against an external force acting from a vertical direction and a lateral direction exceeding a certain limit, and is easily crushed inward. Is obtained.

The container of the present invention having the above structure is
When disposing of the container, the container is removed and the content liquid is discharged. As shown in FIG. 3, the corner of the empty container 1 where the concave groove-shaped rib 7 is formed is formed. By pressing one surface of the flat surface 3a of the part firmly with a fingertip as shown by an arrow, the flat surface 3a is depressed inward so as to have a substantially U-shaped cross section as shown by a dotted line, Since the pair of flat surfaces 3b on which the groove-shaped ribs are not formed are bent so as to protrude outward, they can be bent as if the body wall of the container was folded in two. Thereafter, the empty container of the present invention can be easily folded into a small size by grasping the bottom of the container and bending the container toward the waist wall as shown in FIG.

As described above, the invention of the present application provides a hollow container 1 having a substantially octagonal shape by chamfering a corner of a rectangular cross section. As shown in FIGS. 1 and 2, the reinforcing ribs 7 are formed on the pair of flat surfaces 3 a at the corners, while the other pair of flat surfaces 3 are formed.
b, the flat surface 3b at the corner is strong against the diagonal force acting on the flat surface 3b so as to be deformed into a rhombus, but the pressing force acting on the flat surface 3a Can be easily folded in an inwardly-curved shape.
It should be noted that the present invention is not limited to a square having a square or square shape as in the above-described embodiment, but may be a pentagon, a hexagon, or other polygons.

[0018]

The invention of the present application is directed to a prismatic hollow container in which four corners of a rectangular hollow container are chamfered to form a flat wall surface. The reinforcing ribs are provided in the lateral direction, and a pair of flat surfaces on which the reinforcing ribs are formed and a pair of flat surfaces on which the reinforcing ribs are not formed are provided diagonally at the corners. Even when the thickness of the body is reduced, the strength of the container can be maintained by the pair of flat surfaces on which the reinforcing ribs are not formed, and the pair of flat surfaces on which the reinforcing ribs are formed can be easily folded inward. Since it is possible to reduce the volume of the container at the time of disposal, the container can be disposed of, so that the disposed container can be efficiently collected.

[Brief description of the drawings]

FIG. 1 is a front side view showing the entirety of the present invention.

FIG. 2 is a side view obtained by rotating the elevation view shown in FIG. 1 by 45 degrees.

FIG. 3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a view in which the container of the present invention is crushed.

FIG. 5 is a side view showing a conventional rectangular container.

6 is a sectional view taken along the line BB in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow container 2 Main wall 3 Corner wall surface 3a Corner flat surface 3b Corner flat surface 7 Reinforcement rib 7a Rib 7b Rib 10 Panel wall 11 Depression groove rib 12 Shoulder portion 13 Bottom portion 15 Neck and neck portion

Claims (7)

[Claims] 1. A polygonal cylindrical hollow container having a flat surface formed by chamfering a corner of a square, wherein a concave groove-shaped rib is provided at a middle waist of a main side wall of the container in a lateral direction. Wherein the flat surface formed at the corner portion is constituted by a surface on which a concave groove-shaped rib is formed and a surface on which no rib is formed, wherein the composite is easily crushable. Polygonal hollow container made of resin. 2. The flat surface formed at the corner portion is formed such that a rib continuous with the concave groove of the main side wall is formed, and both ends of the concave groove become gradually shallow and disappear. 2. The easily crushable rectangular hollow container made of synthetic resin according to claim 1, wherein the rectangular hollow container is made of a flat surface which is discontinuous. 3. The flat surface of the corner formed by chamfering four square corners of the cylindrical container, wherein the upper end of the flat corner converges to the base of the mouth and neck through the shoulder of the container. 3. The easily crushable synthetic resin square hollow container according to claim 1, wherein the lower end is formed so as to reach a curved surface of the container bottom. 4. A rectangular panel wall for absorbing a change in internal pressure is provided on each of upper and lower side walls sandwiching a reinforcing rib provided around an intermediate waist of a body side wall of the polygonal cylindrical container. 4. The rectangular hollow container made of synthetic resin that can be easily crushed according to claim 1, wherein the container is formed. 5. The panel wall is formed by surrounding a flat portion of the body side wall in a rectangular shape with a concave groove, and is formed in a V-shape from both ends of a ship bottom-shaped bottom ridge line formed at the center of the rectangular portion. 5. The easily crushable synthetic resin according to claim 4, wherein a pair of inclined ridges reaching the corners of the rectangular groove are formed in the formed depression wall which can be deformed by pressure. Square hollow container. 6. A concave groove-like rib having a length equal to a lateral direction of a rectangular side of the panel wall portion, on a side wall portion at an upper position and a lower position of the panel wall provided with the reinforcing rib of the waist portion interposed therebetween. The rectangular hollow container made of a synthetic resin which can be easily crushed according to claim 4 or 5, wherein is formed in a single character shape. 7. The bottom wall of the polygonal cylindrical container has a convex portion having a large curvature at the ground portion near the outer periphery, and has a circular shape having a multi-stage curved portion near the center and having an inverted curved surface. 7. The easily crushable synthetic resin rectangular hollow container according to claim 1, wherein said rectangular hollow container is formed on a wall surface of the container and can be bent to a flat surface side of a corner portion.