JPH0581009U - Bottle made of synthetic resin - Google Patents

Abstract

(57) [Abstract] [Purpose] It is a technical object to provide no functional portion for absorbing reduced pressure due to depression deformation in the body, and to provide a bottle with a good appearance and high resistance to reduced pressure. [Structure] The bottom portion 2 is composed of a central depressed wall portion 4 and an outer leg wall portion, and the leg wall portion 5 has a structure having a flat wall portion, and includes an inner ground portion and an outer heel portion. And the entire wall is thin, the entire recessed wall portion is recessed and displaced into the trunk portion due to the curved deformation of the leg wall portion, and thus the recessed deformation for absorbing the reduced pressure is not generated in the trunk portion 2. Absorb the reduced pressure generated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a bottom portion of a large-sized biaxially stretched blow molded synthetic resin bottle body in which a reduced pressure is generated inside after filling and sealing a content liquid.

[0002]

[Prior Art]

 For large-sized synthetic resin bottles in which a reduced pressure is generated inside after filling and sealing the content liquid, absorb the reduced pressure generated inside and prevent the bottle from being deformed by the reduced pressure. ing.

A conventional technique for absorbing the reduced pressure generated in the bottle body is, for example, as disclosed in Japanese Utility Model Publication No. 2-19366, a plurality of bodies that are likely to be depressed and deformed due to the reduced pressure generated in the body portion of the bottle. By arranging the recesses in parallel, the recessed deformation of these recesses reduces the substantial volume of the bottle body, thus reducing the degree of decompression generated in the bottle body, and the other portions of the bottle body are improperly depressed due to the pressure reduction. I try not to cause deformation.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, even if only the concave portion is deformed by depression, the concave portion is formed in the body portion which is conspicuous as the appearance of the bottle body. There is a problem that the deformation may deteriorate the appearance of the entire bottle.

Further, the degree of reduction of the pressure reduction due to the depression deformation of the recess is not enough, and especially in the case of a large-sized bottle, the degree of pressure reduction generated is large. However, there was a problem that the diameter of the part where the concave part of the body of the bottle was arranged in parallel was reduced, and the body was deformed as a whole.

Further, the body of the bottle is a portion to which a label for displaying the bottle as a product or a label is attached, but since the label needs to be attached to the smooth surface, However, there was a problem in that sufficient concave portions could not be formed and that a large vacuum absorption capacity could not be obtained.

Furthermore, when the display or decoration is achieved by winding a shrink label made of a heat-shrinkable sheet around the body, rather than by attaching the label, it is necessary to form a sufficient recess. Although it is possible, the diameter of the body with the recess is reduced when the recess is depressed and deformed to absorb the reduced pressure, which causes a problem that the degree of winding assembly of the shrink label on the body is loose. there were.

Therefore, the present invention has been devised to solve the above-mentioned problems in the prior art. The appearance of the bottle is conspicuous, and the body part which is the assembly part of the label or shrink label is depressed. Therefore, the technical problem is not to provide a functional part that absorbs the reduced pressure. Therefore, it is an object of the present invention to provide a bottle that has a large amount of reduced pressure absorption and a high reduced pressure strength and has a good appearance.

[0009]

[Means for Solving the Problems]

 The means of the present invention for solving the above technical problem is that it is a large synthetic resin bottle body in which a reduced pressure is generated inside after filling and sealing the content liquid, and a bottom part connected to the lower end of the cylindrical body part. Is composed of a depressed wall portion that is located in the center and is depressed in the body, and a leg wall portion that is located outside the depressed wall portion, and that the leg wall portion has a flat wall portion, It is composed of a grounding portion located inside and a heel portion located outside, and the leg wall portion is thin overall.

It is appropriate that the wall thickness of the leg wall portion is set to 73.3 to 53.3% of the wall thickness of the leg wall portion that is simply curved and projected downward in the conventional bottle of the same standard. is there.

A flat wall portion is provided on both the ground portion and the heel portion of the leg wall portion, and a first step portion rising from the ground portion toward the heel portion is provided at the boundary portion between the ground portion and the heel portion. It is preferable to form the second step portion that expands in diameter from the heel portion to the body portion at the boundary between the heel portion of the leg wall portion and the body portion of the bottle.

[0012]

[Action]

 The bottom leg wall of the bottle has a flat wall structure, consisting of an inner grounding part and an outer heel part, and the whole is thin. When there is no decompression inside the bottle, the weight of the content liquid does not cause deformation, and the same function as the leg wall of a normal bottle is exerted.

From this state, when decompression occurs in the bottle, the leg wall portion, which has a flat wall portion and is thin overall, has a structure that is easily deformed. It deforms in a manner that causes it to collapse into the body, and absorbs the reduced pressure generated in the bottle body by the deformation that causes the entire wall to collapse into the body.

It is the entire depressed wall portion that is depressed and displaced in the body due to the deformation of the leg wall portion. Therefore, the substantial volume of the bottle body that is reduced by the depressed displacement of the depressed wall portion in the torso portion is It is extremely large, which allows it to fully absorb the reduced pressure generated in the bottle.

The deformation of the leg wall portion that causes the recessed wall portion to be depressed and displaced in the body portion is caused by the depressurization generated in the bottle body. Therefore, the pulling force acting on the bottom portion due to the depressurization is uniform over the entire bottom portion. The recessed wall part, which is depressed and displaced in the trunk part, is displaced in such a manner that the entire body is translated, so that the deformation that occurs in the leg wall part is the same around the entire circumference, and the leg wall part is deformed. The deformation does not cause the inconvenience that the self-sustaining function of the bottle deteriorates.

[0016]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The bottle body 1 (see FIG. 1) has a bottom portion 3 connected to the lower end of a cylindrical body portion 2 with circumferential ridges at the upper and lower ends thereof, and a shoulder portion having a diameter reduced upward at the upper end of the body portion 2. A short cylinder-shaped mouth portion 11 having a thread formed on the outer peripheral surface is provided upright through the portion 10.

The bottom portion 3 (see FIG. 2) is a hat-shaped central recessed wall portion 4 that is recessed in the trunk portion 2, and a portion that is located outside the recessed wall portion 4 and is continuous with the trunk portion 2. And a leg wall portion 5 forming a leg portion of the bottle body 1.

The leg wall portion 5 (see FIG. 3) is composed of a ground portion 6 located inside and a heel portion 7 located outside, and both the ground portion 6 and the heel portion 7 have flat wall portions. A first step portion 8 that rises from the ground contact portion 6 toward the heel portion 7 is provided at the boundary between the ground contact portion 6 and the heel portion 7, and the heel portion 7 and the body portion 2 are A second step portion 9 1 is provided at the boundary portion of the second portion 9 whose diameter increases from the heel portion 7 toward the body portion 2.

The leg wall portion 5 is made thinner than the leg portion 5 ′ in the bottom portion 3 of the conventional standard bottle body shown in FIG. From a number of experiments, it was concluded that it is appropriate that the thickness is 73.3 to 53.3% of the wall thickness of the conventional bottle leg 5 '.

According to an actual measurement of the wall thickness distribution of the leg wall portion 5 in the bottle body 1 of 1.8 liters, the wall thickness of the ground contact portion 6 located on the center side is in the range of approximately 0.52 to 0.55 [mm]. The thickness of the heel portion 7 located outside is in the range of approximately 0.36 to 0.47 [mm], and the thickness of the ground contact portion 6 is the thickness of the ground contact portion 6'of the conventional example. The thickness of the heel portion 7 is about 69.3 to 73.3%, and the thickness of the heel portion 7 is about 53.7 to 70.1% of the thickness of the conventional heel portion 7 '.

The first step portion 8 provided on the leg wall portion 5 and the second step portion 9 provided at the boundary portion between the bottom portion 3 and the body portion 2 are configured to project into the bottle body 1. Therefore, during the biaxially stretch blow molding of the bottle body 1, the preform portion stretch-molded on the leg wall portion 5 comes into contact with the mold portion for molding the first step portion 8 and the second step portion 9 first. As a result, the ground contact portion 6 and the heel portion 7 are locally stretched, and the thinness thereof is promoted.

In addition, when the leg wall portion 5 is deformed due to decompression, the curved wall structure portion near the first step portion 8 is deformed in the direction of increasing the curved curvature, so that the leg wall portion 5 is substantially deformed. The width in the radial direction is increased, whereby the recessed displacement of the recessed wall portion 4 into the body portion 2 shown by the phantom line in FIG. 2 is smoothly performed.

FIG. 4 shows the reduced pressure strength chart test results of the bottle 1 according to the present invention of the above-mentioned standard of 1.8 liters according to the present invention and the bottle of the conventional example. In FIG. 4, the vertical axis represents absorption capacity [ml], and the horizontal axis represents reduced pressure strength [-mmHg]. In FIG. 4, a curve A shows the test result of the bottle 1 of the present invention, and a curve B shows the test result of the conventional bottle.

As is clear from this test result, the bottle body 1 of the present invention exhibits a much larger absorption capacity than the bottle body of the conventional example, and the decompression resistance is extremely high. Can be confirmed.

[0025]

[Effect of the device]

 Since the present invention has the above-mentioned configuration, it has the following effects. When the reduced pressure is generated, the entire depressed wall at the bottom is displaced in the body, so that an extremely large absorption capacity can be obtained and thus an extremely large reduced pressure absorption force can be obtained.

It is the bottom portion that forms the bottom surface of the bottle that is depressed and deformed due to the reduced pressure absorption, so that the deformation due to the reduced pressure absorption is not visible as the appearance of the bottle body, and thus the reduced pressure absorption Therefore, even if the bottle is deformed, it does not deteriorate the appearance of the bottle.

It is the bottom of the bottle that is depressed and deformed to absorb the reduced pressure, and since the deformation of the barrel does not occur due to the reduced pressure, the surface of this barrel can be formed into a smooth surface. Therefore, the attachment of the label or the shrink label can be achieved well.

Since the bottom has a flat wall portion and has a simple structure in which the whole is thinned substantially uniformly, the molding is easy and can be easily carried out.

[Brief description of drawings]

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

FIG. 2 is an enlarged vertical sectional view of a bottom portion of the embodiment shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is a diagram showing the results of a reduced pressure strength chart test of the example shown in FIG. 1 and a conventional example.

FIG. 5 is an enlarged vertical sectional view showing the structure of the bottom portion of the conventional example.

[Explanation of symbols]

 1; Bottle body 2; Body part 3; Bottom part 4; Cave wall part 5; Leg wall part 5 '; Leg part 6; Ground contact part 6'; Ground contact part 7; Heel part 7 '; Heel part 8; First step part 9; Second step 10; Shoulder 11; Mouth

Claims (4)

[Scope of utility model registration request] 1. A large synthetic resin bottle body in which a reduced pressure is generated inside after filling and sealing the content liquid, and a bottom portion (3) connected to the lower end of a tubular body portion (2) is formed. A centrally located recessed wall (4) recessed in the body (2) and the recessed wall (4)
It is composed of a leg wall portion (5) located outside of (4), and the leg wall portion (5) has a structure with a flat wall portion, and is located inside the grounding portion (6) and outside. A synthetic resin bottle body that is made up of thin heels (7) and is thin overall. 2. The thickness of the leg wall portion (5) is 73.3 to the wall thickness of the leg wall portion of the conventional bottle of the same standard, which is simply curved and protrudes.
The synthetic resin bottle according to claim 1, wherein the bottle is made of 53.3%. 3. A flat wall portion is provided on both the grounding portion (6) and the heel portion (7), and the grounding portion (6) and the heel portion are provided.
The synthetic resin bottle body according to claim 1 or 2, wherein a first step portion (8) rising from said grounding portion (6) toward said heel portion (7) is formed at a boundary portion with (7). 4. The heel portion (7) and the trunk portion (2) of the leg wall portion (5).
The synthetic resin bottle body according to claim 1 or 2 or 3, wherein a second step portion (9) is formed at a boundary portion between the heel portion (7) and the body portion (2). .