JPH061213U - Bottle made of synthetic resin - Google Patents

Abstract

(57) [Abstract] [Purpose] It is a technical subject to make it possible to easily collapse and deform the entire flat wall portion provided with the panel wall portion in a constant and stable form, thereby reducing the buckling strength. Instead, to obtain a bottle with high decompression and absorption power. [Structure] A flat wall 4 having a panel wall portion 5 is formed on a body portion 2, circumferential grooves 3 are provided above and below the flat wall 4, and a concave portion 6 is depressed between the flat wall 4 and the circumferential groove 3. Then, the flat wall 4 of the circumferential groove 3 is formed by the ridge lines 7 formed on both side edges of the concave portion 6.
The ability to prevent sinking deformation against
By guiding the depression deformation of the flat wall 4,
It is designed so that it can be easily deformed in a constant and stable manner.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a body wall structure of a synthetic resin bottle, particularly a large bottle which is biaxially stretch blow-molded with polyethylene terephthalate resin or the like.

[0002]

[Prior art]

 Due to the excellent characteristics of molded synthetic resin materials, large bottles made of synthetic resin bottles, especially polyethylene terephthalate resin (hereinafter referred to as PET) biaxially stretch blow molded, are relatively thin. Since it can be molded into various shapes, it is economical and has excellent contents resistance, mechanical strength, and good appearance, so it is used in various fields as a liquid container.

As described above, the biaxially stretch blow-molded synthetic resin bottle body has excellent mechanical strength in spite of its thinness, but the body, which is the main part of the bottle, is thin. Therefore, there is a disadvantage that a part of the body is illegally depressed and deformed due to the decompression generated in the bottle, and the appearance of the bottle as a product is significantly deteriorated.

In order to eliminate the disadvantage of reduced pressure deformation in the biaxially stretch blow molded synthetic resin bottle body, for example, as disclosed in Japanese Utility Model Laid-Open No. 57-199511, a depression is formed in the barrel wall of the body. By deforming multiple deformable panel walls that are easily deformed, the negative pressure generated in the bottle body is absorbed by the uniform deforming deformation of the deformable panel walls, and thus the improper recessive deformation of other parts of the body. Various types of bottles have been proposed that prevent the occurrence of cracks and enhance the ability of the body to maintain its own shape.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned prior art, in order to make sure that the deformation of the deformed panel wall due to the reduced pressure absorption is caused in a constant form, and that the deformed deformation of the deformed panel wall is caused in other parts of the body part. It is necessary to surround the deformable panel wall with a rib wall structure that is difficult to deform so that it will not affect the other parts of the body and cause improper deformation. In order to prevent the lowering of the buckling strength of the body due to the provision of the wall, it is necessary to provide a wall part that functions as a pillar material between the deformed panel walls, so the area of the deformed panel wall cannot be increased sufficiently. For this reason, there is a problem that the degree of decompression that can be absorbed by the depressed deformation of the deformed panel wall is not sufficient.

In particular, in this type of bottle, in order to enhance the buckling strength of the body, a peripheral groove is recessed around the center of the body, and the peripheral groove of the deformed panel wall is formed by this peripheral groove. Since the height dimension cannot be set to a sufficient value, the area of the deformed panel wall is never large, and there is a problem that the deformed panel wall absorbs a reduced pressure.

Further, since the deformed panel wall is formed in advance in a slightly depressed inward shape so that the depressed deformation due to the reduced pressure generated in the bottle is likely to occur, the deformed panel wall is There is a problem that the degree of reduced pressure that can be absorbed is small, and therefore the degree of reduced pressure that can be dealt with is low and the applicable range is narrow.

Therefore, the present invention was devised in order to solve the above-mentioned problems in the prior art, and the flat wall portion provided with the deformed panel wall of the bottle body has a uniform and stable form. It is a technical subject to make it possible to easily collapse and deform, and it is an object of the present invention to provide a bottle body having a large decompression absorption capacity without lowering the buckling strength.

[0009]

[Means for Solving the Problems]

 Means of the present invention for solving the above-mentioned technical problem is to form a flat wall having a panel wall portion for absorbing reduced pressure on a barrel-shaped body having a bottom and a bottom. A circumferential groove should be recessed around the body in such a manner that it is connected to both edges, and a taper wall that expands outward is provided from the center of the upper and lower ends of the flat wall to the groove bottom wall of the opposing circumferential groove. Indenting the concave portion composed of the bottom wall.

By making the recess horizontally long, it is effective to position both left and right ridge lines formed between the tapered wall of the recess and the groove side wall of the circumferential groove near the side ends of the opposing flat walls. is there.

It is preferable that the body has a shape of a bottomed parallel quadrangular cylinder, and at least a pair of flat plate-shaped cylinder wall portions of the body that are opposed to each other are flat walls.

It is practical to provide an upper circumferential groove at the center of the body in the height direction and a lower circumferential groove at the lower end of the body.

[0013]

[Action]

 The recess formed by the taper wall and the bottom wall that spreads outward is recessed in the part from the center of the upper and lower ends of the flat wall to the groove bottom wall of the opposing circumferential groove. The depth of the recessed portion located in the flat wall portion, that is, the height of the tapered wall is larger than the depth of the recessed portion located in the circumferential groove portion, that is, the height of the tapered wall.

Therefore, both side portions of the ridge line formed between the flat wall and the tapered wall of the recessed portion located in the flat wall portion are defined by the tapered wall of the recessed portion located in the circumferential groove portion and the groove bottom of the circumferential groove. Since it is located more laterally than both sides of the ridgeline formed between the wall and the wall, the pair of ridgelines formed between the tapered wall of the recess and the groove sidewall of the circumferential groove are The structure has a taper angle that spreads to the flat wall side.

As described above, since a pair of ridge lines extending to the flat wall side, that is, a protruding bent portion is formed on the groove side wall on the flat wall side of the circumferential groove that is both end edges of the recess, the inside of the bottle When decompression occurs in the deformed panel wall, in addition to the depressed deformation of the deformed panel wall, the entire flat wall is curved and deformed by bending the ridgeline formed between the tapered wall of the recess and the circumferential groove as a bending line. Absorbs.

[0016] This curved depression deformation of the entire flat wall causes the ridge line formed between the tapered wall of the recess and the circumferential groove to be a bending line, and the side wall and the groove of the circumferential groove on the side opposite to the flat wall side. It is achieved by making the connecting portion with the bottom wall and both end portions of the flat wall be curved deformation points.

As described above, the curved depression deformation of the entire flat wall for absorbing the reduced pressure is caused by the ridge line formed between the taper wall of the recess and the circumferential groove and the circumferential groove on the side opposite to the flat wall side. It is caused by the constant bending deformation of the connecting part of the groove side wall and the groove bottom wall, and the specified points called both ends of the flat wall, so the deformation mode is always constant. In addition, in the prior art, since the ridge line as a bending line is formed in the circumferential groove portion that strongly prevented the occurrence of curved depression of the flat wall, the bending depression deformation of the flat wall is easy. It can occur in.

By making the recess horizontally long, if the ridgeline formed between the tapered wall of the recess and the circumferential groove is located near the side end of the flat wall, almost the entire flat wall is curved and depressed. In addition, the ridge line, which is one point for causing the flat wall to be curved and depressed, and the two end portions of the flat wall, which are the other points for causing the flat wall to be curved and depressed, are close to each other. Since it is located, it becomes easier to cause curved depression deformation of the flat wall.

[0019]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall front view of a 2-liter PET biaxial stretch blow molding bottle body 1 in which a body portion 2 has a substantially rectangular tubular shape with a bottom.

At the upper end of the body portion 2, a short cylindrical mouth portion in which a screw thread and a flange are projectingly provided on an outer peripheral surface via a shoulder portion 8 having a polygonal cylindrical frustum shape that is reduced upward. 9 are erected.

An upper circumferential groove 3 is recessed and provided at a position slightly higher than the center of the body 2 in the height direction, and a lower circumferential groove 3 is provided at the lower end of the body 2. Are also set around the sunken area.

Each of the circumferential grooves 3 is composed of a groove bottom wall 3b and a pair of groove side walls 3a inclined from the upper and lower edges of the groove bottom wall 3b in a direction of expanding the mutual distance as it goes outward. It exerts the effect of increasing the buckling strength of the body 2.

A panel for absorbing reduced pressure is provided in the center of each flat tubular wall portion of the body portion 2, that is, eight flat tubular wall portions that are vertically divided into two by the upper circumferential groove 3. The wall portion 5 is formed (see FIGS. 1 and 2), and the flat cylindrical wall portion sandwiched between the upper and lower circumferential grooves 3 of the longitudinal side tubular wall portion of the body portion 2 is flat wall 4 (see FIG. 1). Therefore, a pair of flat walls 4 are provided facing the front and rear of the body 2.

A horizontally elongated upper concave portion 6 is recessed in a portion from the central portion of the upper ends of both flat walls 4 to the groove bottom wall 3b of the upper circumferential groove 3, and similarly, the lower end portions of both flat walls 4 are recessed. A horizontally elongated lower recess 6 is recessed in a portion from the central portion to the groove bottom wall 3b of the lower peripheral groove 3.

Each recess 6 is composed of a taper wall 6 a that expands outward and a bottom wall 6 b that is continuous with the inner end of the taper wall 6 a and forms the bottom of the recess 6, and the flat wall 4 Since the height of the taper wall 6a portion located in the portion is larger than that of the taper wall 6a portion located in the groove bottom wall 3b portion of the circumferential groove 3, both sides which are continuous portions with the flat wall 4 are formed. The end edge is located more laterally than both side edges which are the connecting portions of the taper wall 6a located in the groove bottom wall 3b portion of the circumferential groove 3 and the groove bottom wall 3b, and therefore the recess 6 The taper wall 6a of the peripheral groove 3 has a pair of ridge lines 7 formed as a continuous portion with the groove side wall 3a, and is inclined in a direction of expanding from the peripheral groove 3 toward the flat support wall 4 (see FIG. 1). .

In the illustrated embodiment, since the recess 6 is formed with a width substantially equal to that of the panel wall portion 5, the flat wall 4 is deformed in a flat manner to absorb the reduced pressure. The entire wall 4 is deformed, so that the depression deformation of the panel wall portion 5 that absorbs the reduced pressure is achieved in a constant form without being affected by the depression deformation of the flat wall 4. Become.

It should be noted that the height and width of the upper recessed portion 6 should be set to a value that allows the fingertip to intrude with a margin, and the depth of the recessed portion 6 should be set to a value at which the intruding fingertip can be strongly caught. As a result, the central portion of the body portion 2 provided with the upper recessed portion 6 can be made to function as a grip portion, and the bottle 1 can be handled well.

[0028]

[Effect of device]

 Since the present invention has the above-mentioned configuration, it has the following effects. Absorption of the reduced pressure generated in the bottle is not only due to the collapsed deformation of the panel wall provided on the cylinder wall of the body, but also the collapse of almost the entire flat wall provided with this panel wall. It is also achieved by the deformation, and thus it is possible to exert an extremely large vacuum absorption capability.

The flat wall that is depressed and deformed to absorb the reduced pressure can be always depressed and deformed in a constant and stable form and easily due to the action of the ridgeline formed by providing the concave portion. Depression deformation due to reduced pressure absorption of the part can be achieved with a constant and stable form, and thus the depression deformation generated due to reduced pressure absorption is achieved with a good appearance form, impairing the appearance of the bottle body. Never.

Since the concave portion is formed without impairing the basic structure of the circumferential groove, it does not deteriorate the buckling strength reinforcing action generated by the circumferential groove, and thus does not lower the buckling strength. It is possible to provide a bottle with high vacuum absorption capacity.

Since only a concave portion and a peripheral groove are newly added to the conventional bottle and the concave portion and the peripheral groove can be easily formed without difficulty, the conventional molding technique can be used. It can be used as it is and easily implemented.

[Brief description of drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is an overall side view of the embodiment shown in FIG. 1 with a bottom portion omitted.

FIG. 3 is an enlarged vertical sectional side view of an upper concave portion in the embodiment shown in FIG.

FIG. 4 is an enlarged vertical sectional front view of a circumferential groove portion in the embodiment shown in FIG.

FIG. 5 is a plan sectional view taken along the line AA in FIG.

[Explanation of symbols]

 1; Bottle body 2; Body part 3; Circumferential groove 3a; Groove side wall 3b; Groove bottom wall 4; Flat wall 5; Panel wall part 6; Recessed part 6a; Tapered wall 6b; Bottom wall 7; Ridge line 8; Shoulder part 9; Mouth

Claims (4)

[Scope of utility model registration request] 1. A flat wall (4) having a panel wall (5) for absorbing reduced pressure is formed on a body (2) having a bottomed cylindrical shape,
The body portion is continuously connected to both upper and lower edges of the flat wall (4).
A peripheral groove (3) is recessed around (2), and is outwardly provided in a portion from the central portion of both upper and lower ends of the flat wall (4) to the groove bottom wall (3b) of the peripheral groove (3) facing each other. A synthetic resin bottle body in which a concave portion (6) composed of an expanding taper wall (6a) and a bottom wall (6b) is depressed. 2. The left and right ridgelines (3) formed between the tapered wall (6a) of the recess (6) and the groove side wall (3a) of the circumferential groove (3) by making the recess (6) laterally long. The synthetic resin bottle body according to claim 1, wherein 7) is located near the side ends of the opposing flat walls (4). 3. The body (2) has a bottomed parallel rectangular tube shape,
The synthetic resin bottle body according to claim 1 or 2, wherein at least a pair of flat plate-shaped cylindrical wall portions of the body portion (2) facing each other are flat walls (4). 4. The upper circumferential groove (3) is provided at the center of the body (2) in the height direction, and the lower circumferential groove (3) is provided at the lower end of the body (2). Item 1. A synthetic resin bottle body according to item 1 or 2 or 3.