JPH1170929A - Plastic container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a container to be squashed at the time of disposal of the used container by constituting a body of a variable wall face and an invariable wall part, wherein the variable wall face is connected to an invariable wall face via a rib and the variable wall face reversely rotates with the rib as an axis. SOLUTION: A container is pressed and squashed from the forward and backward sides at the time of disposal of the used container. When a variable flat wall 18a is pressed, the wall 18a rotates with a longitudinal rib 15a as an axis, while a variable side wall 19a rotates together with a longitudinal rib 16b as an axis. In addition, an upper gradient wall 20a rotates with an upper lateral rib 17a as an axis, and a lower gradient wall 21a rotates with a lower lateral rib 24a as an axis. At this time, the variable flat wall 18a is bent inward in the container to insure rotation of the variable side wall 19a, while center parts of the variable flat wall 18a and the variable side wall 19a are bent inward in a longitudinal direction to facilitate rotation of the upper and lower gradient walls 20a, 21a. Thus a volume of plastic wastes can be reduced, thereby improving transportation efficiency of the wastes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushable plastic container.

[0002]

In recent years, disposal of plastic waste has become a major problem, and recycling of used plastic containers has been practiced. Further, in order to reduce the amount of dust, the container is crushed. Therefore, it is recommended to separate used plastic containers from each household and to crush the containers, but plastic containers are used to store liquid contents and maintain a certain external shape to prevent damage. Since a certain strength must be provided, a considerable amount of crushing force is required to crush a used empty plastic container and reduce the volume of the container.

[0003] Therefore, at present, in general households, plastic containers are taken out of the collection place without being crushed. For this reason, plastic waste becomes bulky, and there is a limit even if it is crushed by a garbage truck, and the problem of poor transport efficiency cannot be solved. Further, even if the container can be easily crushed, a cap must be fitted in the crushed state to prevent the container from being restored, and the inside of the container must be kept under reduced pressure. There is also a problem that materials are mixed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its technical object to make it possible for a container to hold a liquid content while maintaining a certain strength and to be able to crush the used container at the time of disposal. An object is to provide plastic containers of various shapes.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above technical object, the present invention provides a crushable plastic container which is a rectangular plastic container comprising a mouthpiece and a shoulder, and a body and a bottom. The body portion includes a variable wall surface and a constant wall portion that supports the variable wall surface. The variable wall surface is connected to the constant wall surface through a rib portion, and the variable wall surface rotates around the rib portion. A configuration characterized by being inverted is adopted.

As a rectangular plastic container, a flat diamond-shaped wall having a shoulder having a side edge and an inclined edge, an inclined wall extending from the side edge of the flat wall, and a vertical wall extending from the inclined edge. The body comprises a constant wall surface and a variable wall surface, and the constant wall surface includes a front wall and a side wall that are continuous with a lower edge of the inclined wall of the shoulder portion, and the variable wall surface Is a trapezoidal variable flat wall, a trapezoidal variable side wall connected to the variable flat wall, a triangular upper inclined wall connected to an upper edge of the variable flat wall and the variable side wall, and the variable flat wall and the variable side wall. And a lower inclined wall connected to the lower edge of the front wall, a trapezoidal variable flat wall, a side wall and a trapezoidal variable side wall, a water straight wall and an upper inclined wall, and a bottom wall and a lower inclined wall. Ribs are provided at each connection part, and each variable wall is designed to rotate and invert around the ribs. To adopt a configuration in which the butterflies.

[0007] As a diamond-shaped plastic container, the shoulder portion has an arc edge and a straight edge at the lower end, and the lower end edge is formed in a substantially rhombus shape with a circular arc at the corner, and the body portion is invariable. The wall comprises a wall and a variable wall, and the invariable wall includes an arc wall continuous with the arc edge, and a band-shaped wall extending continuously in a lateral direction and connected to a straight edge, and the variable trunk wall has a hexagonal shape. A flat wall, a trapezoidal side wall connected to a side edge of the flat wall, an upper inclined wall connected to an upper inclined edge of the flat wall and an upper edge of the side wall, and a lower inclined edge and a side wall of the flat wall A lower sloped wall connected to the lower edge of the arc-shaped wall and the side wall, the strip-shaped wall and the upper sloped wall, and a rib disposed at each connection portion between the bottom wall and the lower sloped wall. A configuration is adopted in which the variable wall surface is rotated and inverted around the rib.

As an embodiment of the container, a step is formed on each of the side walls, the upper inclined wall, and the lower inclined wall so as to be continuous on one plane, and each wall is divided into front and rear by the step. A configuration characterized by the following is added.

[0009] As a rectangular plastic container, the shoulder portion has a circular step portion following the mouthpiece portion, and an inclined surface following the step portion, the lower end edge of which is formed in a rectangular shape, and the body portion is formed. A band-shaped wall connected to the lower edge of the shoulder, a side band-shaped wall extending downward from the end of the band-shaped wall and connected to the bottom, and a variable wall surface. A trapezoidal vertical wall, a side inclined wall connected to a side edge of the vertical wall, an upper inclined wall connected to an upper edge of the vertical wall and the side inclined wall, and a vertical wall and a side inclined wall. A configuration characterized by comprising a lower inclined wall connected to the lower edge is adopted.

[0010] As a triangular plastic container, the shoulder is formed in an equilateral triangle with its lower end in an arc of a corner,
An arc edge and a straight edge are provided, and the trunk portion extends in the shape of a rectangular tube, and has an arc wall continuous with the arc edge, a band-shaped wall provided continuously with the straight edge and extending in the lateral direction, and a variable wall surface. Have,
The variable body wall is a rectangular vertical wall, a side inclined wall connected to a side edge of the vertical wall, an upper inclined wall connected to an upper end edge of the vertical wall and the side inclined wall, and a vertical wall. A configuration is adopted in which the lower end wall is provided continuously with the lower edge of the wall and the side inclined wall.

[0011]

Next, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the container A1 includes a mouthpiece 1 and a shoulder 2, a body 3 and a bottom 4, and is formed by blow molding using a synthetic resin as a raw material.

As shown in FIGS. 2 and 3, a screw 5 and a bulging ridge 6 are provided on the outer periphery of the barrel 1. Shoulder 2
It comprises a circular step 7 following the mouthpiece 1 and a rhombic flat wall 8 formed by a straight line in contact with the circumference of the circular step 7. The inclined walls 9a and 9b extend from both side edges of the flat wall 8, and the trapezoidal vertical walls 10a and 10b extend from the front and rear inclined edges.
b is extended.

As shown in FIG. 3, the lower end of the inclined wall 9a is
A front edge 11a and a side edge 11b, and an inclined wall 9b.
Has a rear edge 11c and a side edge 11d,
Each end is connected by an arc. Edge 11
a, b, c, d are the lower edges 12 of the vertical walls 10a, 10b.
The lower end surface of the shoulder portion 2 is formed together with a and 12b, and the planar shape thereof is a long hexagon in which the opposite sides are parallel and the front and rear corners are arcs.

As shown in FIGS. 2 and 4, the body 3 has a substantially rectangular cross section. When the container is crushed and deformed, an invariable wall surface 3a that maintains the original state after the container is pressed is formed. And a variable wall surface 3b whose deformation state is maintained even after pressing. The invariable wall surface 3a includes front walls 13a, 13 which are continuous with the front and rear edges 11a, 11c of the inclined wall 9.
b and side walls 14a, 14b,
14b. The front and rear front walls 13a, 13b and the side walls 14a, 14b are connected by an arc wall.

Vertical ribs 15a and 15b are provided at the edges of the front walls 13a and 13b, respectively.
Vertical ribs 16a and 16b are provided on the edge of 4b. Lower edges 12a, 12b of the vertical walls 10a, 10b
Are provided with upper horizontal ribs 17a, 17b (not shown).

The variable wall surface 3b is provided with trapezoidal variable flat walls 18a and 18b connected to the vertical ribs 15a and 15b, and connected to the variable flat walls 18a and 18b and connected to the vertical ribs 16a and 16b. It has a trapezoidal variable side wall 19a, 19b.

Variable flat walls 18a, b and variable side walls 19
Triangular upper inclined walls 20a and 20b are continuously provided between the upper edges of the upper and lower horizontal ribs 17a and 17b, and the variable flat walls 18a and 18b and the variable side walls 1 are connected to each other.
Triangular lower inclined walls 21a, 21b are continuously provided between the lower end edges of 9a, 19b and the rising portion of the bottom portion 4. The variable flat wall 18, the variable side wall 19, and the upper and lower inclined walls 20, 21 constitute a variable wall surface 3b.

The bottom 4 has a bottom wall 22 which is continuous with the front walls 13a, 13b and the side walls 14a, 14b and has a planar shape similar to that of the lower end of the shoulder portion 2. At the rising portion of 23b, a lower horizontal rib 24
a, 24b are provided, and the lower horizontal ribs 24a, 2b are provided.
4b is connected to the lower inclined walls 21a and 21b.

The front and rear vertical ribs 15a and 15b and the upper and lower horizontal ribs 17 and 24 are arc-shaped ribs as shown in FIG. 26a, 26b, the ribs are difficult to bend in the longitudinal direction, but the curved portion 25 and the connecting portion 26 are easily bent in the lateral direction, and mutually bend the wall surface to be connected with the rib as an axis. Like that.

As can be seen from FIG. 4, the vertical ribs 16a and 16b are formed as band-shaped walls orthogonal to the side wall 14, and operate in the same manner as the above-mentioned arc-shaped rib.
a and b are easily bent with respect to the side walls 14a and 14b.

Next, the crushing action of the container will be described. When the used container is discarded, the container A1 is crushed by pressing the trunk from front and rear. When the variable flat wall 18a is pressed, the variable flat wall 18a
, The variable side wall 19a rotates about the vertical rib 16b, the upper inclined wall 20a is about the upper horizontal rib 17a, and the lower inclined wall 21a is
It rotates around the axis 4a. At that time, the variable flat wall 18a curves inward of the container to ensure rotation of the variable side wall 19a, and the variable flat wall 18a and the variable side wall 19a have their central portions bent inward in the vertical direction. Upper and lower inclined walls 20a,
The rotation of 21a is facilitated.

As shown in FIG. 6, the variable wall surface 3b is inverted to a symmetrical position indicated by a dotted line with respect to a plane X1 formed by the vertical ribs 15a, the vertical ribs 16a, the upper horizontal ribs 17a, and the lower horizontal ribs 24a. Moving. At this time, the front wall 13a, the side walls 14a and 14b, and the vertical walls 10a and 10b also bend, but are restored after the deformation of the variable wall surface, and the connection between each rib and the wall surface is plastically deformed and maintained at the moving position. The volume of the container is reduced by about half.

Next, a second embodiment will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 7, the container A2
It is composed of a mouthpiece portion 30 and a shoulder portion 31 provided with a screw and a bulging portion on the outer periphery, and a body portion 32 and a bottom portion 33, and is formed by blow molding using synthetic resin as a material.

The shoulder portion 31 is formed by an inclined surface following the mouthpiece portion 30. The shape of the lower end edge of the shoulder portion 31 is a rhombus with rounded corners as shown in FIG. The corners are arc edges 34a, 34b, the front and rear corners are arc edges 35a, 35b, and each arc is a straight edge 36a,
They are connected by b, c, d.

As shown in FIGS.
Comprises an invariable wall surface and a variable wall surface, and the invariable wall surface is formed by arc walls 37a, 37b continuous with the arc edges 34a, 34b.
And strip-shaped walls 38a, b, c, d (38c, d not shown) which are continuous with the straight edges 36a, b, c, d and extend in the horizontal direction.

The variable wall surfaces are disposed on the front and rear surfaces of the container, and have two upper inclined edges 39a and 39b and two lower inclined edges 40 on the left and right.
Hexagonal flat wall 42 having a, b and side edges 41a, b
a, 42b and side edges 41a, 42a of the flat walls 42a, 42b.
It has trapezoidal side walls 44a, b, c, d having steps 43a, b, c, d connected to b.

The upper edges 39a, b of the flat walls 42a, b and the upper edges of the side walls 44a, b, c, d and the strip-shaped walls 38a,
Triangular upper inclined walls 46a, b, c, and d having steps 45a, b, c, and d are continuously provided between the flat walls 42a, b and the lower walls 42a, b. Lower inclined walls 49a, b, c, d having triangular steps 48a, b, c, d are continuously provided between the lower edges of the edges 40a, b and the side wall 44 and the rising portions 47 of the bottom 33. Have been. The flat wall 4
2. A variable wall surface is constituted by left and right side walls 44 and upper and lower inclined walls 46 and 49.

At the side edges of the arc walls 37a, 37b,
Vertical ribs 50 a, b, c, and d having arc cross sections are provided, and the arc wall 37 and the side wall 44 are connected via the vertical ribs 50. Arc-shaped upper horizontal ribs 51a, 51b are provided at lower end edges of the strip-shaped walls 38a, 38b.
The band-shaped walls 38a, 38b and the upper inclined walls 46a, 46b are connected via b.

At the peripheral rising portions 47a and 47b of the bottom portion 33, arc-shaped lower horizontal ribs 52a and 52b are provided, and the rising portions 47 of the bottom portion 33 are formed via the lower horizontal ribs 52a and 52b.
a and b are connected to the lower inclined walls 49a and 49b. The middle ends of the upper horizontal ribs 51a and 51b are bent downward to form short vertical ribs 53a and 53b.
The end of b is bent upward to form short vertical ribs 54a and 54b.

The upper inclined walls 46a, b and the side walls 44a,
b, c, d, each step 4 of the lower inclined wall 49a, b, c, d
3, 45, 48 are formed so as to be continuous on one plane, and each wall surface is divided into front and rear by a step portion.
The bottom 33 has a bottom wall 55 having the same shape as the shoulder 31.

Next, the crushing action of the container A2 will be described. When the end of the flat walls 42a and 42b is pressed when the used container is discarded, the flat walls 42
, The front half of the side wall 44, the upper inclined wall 46, and the lower inclined wall 49 rotates about the steps 43, 45, and 48, respectively. At that time, flat walls, side walls,
The front halves of the upper inclined wall and the lower inclined wall are each curved to ensure the rotation of the other wall.

Then, the rear half of each of the upper and lower horizontal ribs 51, 50 and 52 rotates around the axis, and as shown in FIGS. Flips to a symmetrical position with respect to X2,
Crushed. At that time, the connection portion between each rib and the wall surface undergoes plastic deformation as in the first embodiment, is maintained at the moving position, and the volume of the container is reduced to about half. Further, since the side wall and the upper inclined wall are divided into front and rear by the step portion, the reversal rotation is easy.

Next, a third embodiment will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 12, the container A3
Is a mouthpiece portion 60 provided with a screw and a bulging portion on the outer periphery and a shoulder portion 6.
1, and a body 62 and a bottom 63, which are formed by blow molding using synthetic resin as a material.

The shoulder 61 is formed by a circular step 64 following the mouthpiece section 60 and an inclined surface following the step 64, and the lower end of the shoulder 61 is rectangular.
a, b and side edges 66a, b.

As shown in FIGS. 13 and 14, the body 62
An upper band-shaped wall 67 that is connected to the edge 65a and extends in the lateral direction.
a, b, side band-shaped walls 68a, b, c, d extending downward from ends of the upper band-shaped walls 67a, b and connected to the bottom 63.
And As shown in FIG. 16, the bottom 63 includes a rectangular bottom wall 69 wider than the shoulder 61, and rising portions 70 a, b, c, and d following the peripheral edge of the bottom wall 69.

As shown in FIGS. 13, 15 and 16, on the peripheral surface of the body 62, a surface X3 formed by the upper band-shaped wall 67a, the side band-shaped walls 68a and 68b, and the rising portions 70a and 70c. The front and rear variable wall surfaces 71a, b are formed so as to swell, and the side edges 66a, b of the shoulder portion 61 and the side band-shaped wall 68 are formed.
Variable wall surfaces 72a, b on the side portions so as to protrude from the outer edge of a, b, and the surface Y formed by rising portions 70b, d.
Are formed.

The front and rear variable wall surfaces 71a are formed as trapezoidal vertical walls 7a.
3a, 3b and side inclined walls 74a, 74b connected to the side edges of the vertical wall 73 and connected to the side strip-shaped walls 68a, 68b.
c, d and an upper inclined wall 75 connected to the upper edge of the vertical wall 73 and the side inclined wall 74 and connected to the upper band-shaped wall 67.
a, b and lower inclined walls 76a, b connected to the lower edges of the vertical wall 73 and the side inclined wall 74 and connected to the upper edge of the rising portion 70a.

The variable wall surfaces 72a, 72b at the side portions are shown in FIGS.
As shown in FIG. 6, the trapezoidal vertical walls 77a and 77b are connected to the side edges of the vertical walls 77a and 77b.
Inclined walls 78a and 78b connected to the outer edge of the
7 and an upper inclined wall 7 connected to the upper edges of the side inclined walls 78a, b, c, d and connecting the side edges 66a, b of the shoulder 61.
9a and 9b, and lower inclined walls 80a and 80b connected to the lower ends of the vertical wall 77 and the side inclined walls 78a and 78b and connected to the rising portion 70a.

The upper band-shaped walls 67a and 67b and the side band-shaped walls 6
The ribs 8a, b, c, and d are provided with the function of the ribs in the first and second embodiments, and form a support portion for deforming the variable wall surface, that is, an invariable portion.

Next, the crushing action of the container A3 will be described. When the used container is discarded, the container is crushed by pressing the vertical walls of the front and rear and both variable wall surfaces. When the vertical wall 73a is pressed, the side inclined wall 74 is pressed.
a, b rotate around the side band-shaped walls 68a, b, the upper inclined wall 75 rotates around the upper band-shaped wall 67a, and the lower inclined wall 80 rotates around the rising portion 70 as an axis. that time,
The vertical walls will bend in the vertical and horizontal directions, facilitating the rotation of the side walls, the upper and lower inclined walls.

Finally, as shown by the dotted line in FIG. 16, the variable wall surface 71 is inverted to a position symmetrical with respect to the plane X3. Similarly, the variable wall surface 72 is also inverted with respect to the plane Y. Will be done. The container is reduced in volume as shown in FIG. 17, and the volume reduction rate can be substantially increased by inverting the container alternately, but further by folding the band-shaped wall of the body in the middle. The volume reduction rate can be increased.

Next, a fourth embodiment will be described with reference to FIGS.
This will be described with reference to FIG. As shown in FIG. 18, the container A4
Is a barrel portion 90 provided with a screw and a bulging portion on the outer periphery and a shoulder portion 9.
1, and a body 92 and a bottom 93, which are formed by blow molding using synthetic resin as a raw material.

As shown in FIGS. 18 and 20, the shoulder 91 is
The lower end is formed in a substantially equilateral triangle, and has an arc edge 94a, b, c and a straight edge 95a, b, c formed at each corner. I have.

As shown in FIGS.
2 is an arc-shaped wall 96a, b, c extending in the shape of a rectangular tube and continuing to the arc-shaped edges 94a, b, c, and strip-shaped walls 97a, b connected to the straight edges 95a, b, c and extending in the lateral direction. , C and a variable wall surface 98a bulging from a plane X4 connecting the arc walls 96.
b and c. The bottom portion 93 has the same shape as the shoulder portion 91, and has a bottom wall 100 provided with rising portions 99a, 99b, and 99c.

The variable wall surfaces 98a, b, c are connected to rectangular vertical walls 101a, b, c and side edges of the vertical walls 101a, b, c, respectively. Inclined walls 102a, b, c and 103a, b, c
And vertical wall 101 and side inclined walls 102a, b, c,
103a, b, and c, the belt-shaped walls 97a,
The upper inclined walls 104a, b, c connecting the b and c, and the lower inclined walls connected to the lower edges of the vertical walls 101a, b, c and the side inclined walls 102, 103 and connecting the rising portion 99 of the bottom wall. It consists of walls 105a, b, c.

By the arc-shaped walls 96a, b, c and the strip-shaped walls 97a, b, c connected to the straight edge 95, a support portion for deforming the variable wall surface, that is, an invariable wall surface is formed.

Next, the crushing action of the container A4 will be described. When disposing of used containers, each variable wall is crushed sequentially. As the vertical walls 101a, b, and c are pressed, the side inclined walls 102 and 103 rotate around the edge of the arc wall 96 as an axis, and the upper inclined wall 104 becomes the strip-shaped wall 97.
, The lower inclined wall 105 rotates around the bottom rising portion 99 as an axis. At this time, each wall surface including the rectangular vertical wall is curved, and finally the variable wall surface 98 is symmetrical with respect to a plane X4 formed by the arc wall 96, the band-like wall 97 of the shoulder portion 91, and the rising portion 99. Move to a typical position,
As shown in FIGS. 21 and 22, the bulging portion to be crushed is reduced in volume.

As the synthetic resin of the container of each of the above embodiments,
PET, polyethylene, or other resin is used, and the cap is fitted. When the cap and the material resin of the container are different, only the container can be crushed and discarded separately.

[0049]

Since the present invention is configured as described above, it has the following effects. Since the variable wall surface is formed on the body of the blow-molded container, the used container after the content liquid is poured out can be easily crushed by pressing. Therefore, the volume of plastic waste can be reduced, and the efficiency of waste transportation can be increased. When crushing the container, it is not necessary to cover the cap and keep the decompressed state,
Only the container can be crushed, and it is possible to easily prevent mixing of different kinds of resins in the regeneration treatment.

[Brief description of the drawings]

FIG. 1 is a perspective view of a container according to a first embodiment of the present invention.

FIG. 2 is a front view of the container.

FIG. 3 is a plan view of the container.

FIG. 4 is a sectional plan view taken along line AA in FIG. 2;

FIG. 5 is a sectional view of an arc rib.

FIG. 6 is a plan view of the container after being crushed.

FIG. 7 is a perspective view of a container according to a second embodiment of the present invention.

FIG. 8 is a front view of the container.

FIG. 9 is a plan view of the container.

FIG. 10 is a sectional plan view taken along line AA in FIG. 8;

FIG. 11 is a plan view of the container after being crushed.

FIG. 12 is a perspective view of a container according to a third embodiment of the present invention.

FIG. 13 is a front view of the container.

FIG. 14 is a plan view of a container.

FIG. 15 is a side view of the container.

FIG. 16 is a sectional plan view taken along line AA in FIG. 13;

FIG. 17 is a perspective view of the container after being crushed.

FIG. 18 is a perspective view of a container according to a fourth embodiment of the present invention.

FIG. 19 is a front view of the container.

FIG. 20 is a plan view of the container.

21 is a sectional plan view taken along line AA in FIG.

FIG. 22 is a perspective view of the container after being crushed.

[Explanation of symbols]

A1, A2, A3, A4 Container 1, 30, 60, 90 Mouth 2, 3, 61, 91 Shoulder 3, 32, 62, 92 Trunk 3a Invariable wall 3b Variable wall 4, 33, 63, 93 Bottom 8 Flat wall 9a, b Inclined wall 10a, b Vertical wall 13a, b Front wall 14a, b Side wall 15a, b, 16a, b, 50a, b, c, d Vertical rib 17a, b, 51a, b Upper horizontal rib 18a , B Variable flat wall 19a, b Variable side wall 20a, b Upper inclined wall 21a, b Lower inclined wall 24a, b, 52a, b Lower horizontal rib 26a, b Connection 37a, b Arc wall 38a, b, c, d Walls 42a, b Flat walls 43a, b, c, d, 45a, b, c, d, 48a,
b, c, d Steps 44a, b, c, d Side walls 46a, b, c, d Upper inclined walls 49a, b, c, d Lower inclined walls 53a, b, 54a, b Vertical ribs 64 Steps 67a, b Upper band-shaped wall 68a, b, c, d Side band-shaped wall 71a, b, 72a, b Variable wall 73a, b Vertical wall 74a, b, c, d Side inclined wall 75a, b Upper inclined wall 76a, b Lower inclined Wall 77a, b Vertical wall 78a, b, c, d Side inclined wall 79a, b Upper inclined wall 80a, b Lower inclined wall 96a, b, c Arc wall 97a, b, c Strip-shaped wall 98a, b, c Variable wall 101a, b, c Vertical wall 102a, b, c, 103a, b, c Side inclined wall 104a, b, c Upper inclined wall 105a, b, c Lower inclined wall

Claims (6)

[Claims] 1. A rectangular plastic container comprising a mouthpiece portion, a shoulder portion, a body portion and a bottom portion, wherein the body portion comprises a variable wall surface and a constant wall portion supporting the variable wall surface, Is a crushable plastic container which is connected to an invariable wall portion through a rib portion, and wherein the variable wall surface is rotated around the rib portion to be inverted. 2. A rectangular plastic container comprising a mouthpiece portion and a shoulder portion, a body portion and a bottom portion, wherein the shoulder portion has a rhombic flat wall having a side edge and an inclined edge,
The flat wall has an inclined wall extending from a side edge thereof and a vertical wall extending from the inclined edge. The trunk portion includes an invariable wall surface and a variable wall surface, and the invariable wall surface is an inclined wall of the shoulder portion. A front wall and a side wall that are continuous with a lower edge of the variable flat wall, the variable wall is a trapezoidal variable flat wall, a trapezoidal variable side wall connected to the variable flat wall, a variable flat wall and a variable side wall. It has a triangular upper inclined wall connected to the upper end edge, and a lower inclined wall connected to the lower end edge of the variable flat wall and the variable side wall, and a front flat wall and a trapezoidal variable flat wall, a side wall and a trapezoidal. A rib is provided at each connecting portion between the variable side wall, the vertical wall and the upper inclined wall, and the connecting portion between the bottom bottom wall and the lower inclined wall, and each variable wall is rotated around the rib as a shaft. A crushable plastic container. 3. A rhombic plastic container comprising a mouthpiece portion and a shoulder portion, a body portion and a bottom portion, wherein the shoulder portion has an arc edge and a straight edge at a lower end, and a lower edge is a corner portion. Is formed in a substantially rhombic shape having an arc, and the body portion includes an invariable wall surface and a variable wall surface, and the invariable wall surface is connected to an arc wall continuous with the arc edge and a straight edge, and is formed in a lateral direction. An elongated band-shaped wall, wherein the variable body wall is a hexagonal flat wall, a trapezoidal side wall connected to a side edge of the flat wall, an upper edge of the flat wall, and an upper edge of the side wall. And a lower inclined wall connected to a lower inclined edge of the flat wall and a lower edge of the side wall, the arc-shaped wall and the side wall, the strip-shaped wall and the upper inclined wall, and the bottom. A crushing method characterized in that a rib is provided at each connection portion between the wall and the lower inclined wall, and each variable wall surface is rotated and inverted around the rib. Noh plastic container. 4. A step is formed on each of the side walls, the upper inclined wall, and the lower inclined wall so as to be continuous on one plane, and each wall is divided into front and rear by the step. A crushable plastic container according to claim 3. 5. A rectangular plastic container comprising a mouthpiece and a shoulder, a body and a bottom, wherein the shoulder has a circular step following the mouth and an inclined surface following the step. A lower end edge thereof is formed in a rectangular shape, and a body portion extends downward from an end of the belt-shaped wall and an end portion of the belt-shaped wall, and is connected to a corner portion of the bottom portion. Side wall-shaped wall, and a variable wall surface, wherein the variable wall surface has a trapezoidal vertical wall, a side inclined wall connected to a side edge of the vertical wall, a vertical wall and a side inclined wall. A crushable plastic container comprising: an upper inclined wall connected to an upper edge of the wall; and a lower inclined wall connected to lower edges of the vertical wall and the side inclined walls. 6. A triangular plastic container comprising a mouthpiece portion and a shoulder portion, a trunk portion and a bottom portion, wherein the shoulder portion is formed in a regular triangle having a lower end in an arc of a corner and an arc edge. The body portion has a rectangular wall shape, extends in the shape of a rectangular tube, and is continuous with the arc edge, a strip-shaped wall connected to the linear edge and extending in the lateral direction, and a variable wall surface. The variable wall surface is a rectangular vertical wall, a side inclined wall connected to a side edge of the vertical wall, an upper inclined wall connected to an upper edge of the vertical wall and the side inclined wall, A crushable plastic container comprising a vertical wall and a lower inclined wall connected to a lower edge of the side inclined wall.