JPH0551716U - Blow molded synthetic resin bottle - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the self-sustaining stability of blow-molded bottles that form the bottom of a long quadrilateral, and to avoid a decrease in strength. [Structure] In a blow molded bottle with a long bottom,
The bottom structure of the bottle is characterized in that the whole is in a bottom-up shape and extends from the periphery of the bottom to the center so that the amount of heap on the short side is larger than that on the long side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a biaxially stretch blow molded synthetic resin bottle having improved self-standing stability and the like.

[0002]

[Prior Art]

 With the recent diversification of lifestyles, the shapes of synthetic resin bottles for packaging beverages have been remarkably diversified. Among them, there are bottle bodies whose cross-sectional shape is elliptical or rectangular, and when these are gripped on the short side, they have the advantage that the gripping posture is good, and many are commercially available.

FIG. 6 shows an example of the bottle 1 whose cross-sectional shape of the body is a substantially quadrangular shape with four corners cut. The shape of the bottom surface of the bottom portion 2 is as shown in FIG. 7, and the bottom portion 2 is raised 3 by a substantially elliptical ring. As shown in FIGS. 8 and 9, the shape of the raised bottom 3 is substantially uniform on the short side and the long side.

[0004]

[Problems to be solved by the device]

 As is clear from FIGS. 8 and 9, there is a difference in the wall thickness of the molding resin at the long side and short side contact portions of the raised bottom 3. This is due to the degree of blow stretching of the resin of the bottom-up 3 at the time of blow molding, and naturally the degree of blow stretching is small at the ground contact portion on the short side and the wall thickness becomes large accordingly (hereinafter, Called a puddle).

The occurrence of the lump 4 due to the blow molding described above becomes more significant as the difference between the major axis and the minor axis becomes larger. The shrinkage amount of the flesh pool 4 on the short-diameter grounding portion side becomes larger than others at the time of cooling after completion of blow molding, so-called sink marks due to nonuniformity, cooling delay, and low orientation reduce orientation. However, there are problems such as whitening of the resin, resulting in a decrease in the self-sustaining stability of the product bottle and a decrease in the drop strength. The present invention aims to solve such problems.

[0006]

[Means for Solving the Problems]

 This invention relates to a blow-molded bottle whose bottom has a substantially elliptical shape, an oval shape, a quadrilateral shape, or the like, which has an elongated bottom having different lengths in the X and Y biaxial directions. A blow-molded synthetic resin bottle having a shape, in which the amount of swelling from the long side to the central part is increased from the long side to the short side in accordance with the long side / short side ratio.

[0007]

[Action]

 In this invention, as described above, since the bottom raised portion of the blow-molded synthetic resin bottle is largely raised on its short side rather than its long side, the degree of blow stretching of the above-mentioned resin is made substantially uniform, and the meat The formation of puddle is significantly reduced or eliminated altogether.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the figure, 11 is a bottle, 12 is a bottom portion, and 13 is a raised bottom portion.

As is apparent from FIGS. 3 and 4, in this embodiment, the raised portion 13 of the bottom portion 12 makes the raised amount on the short side larger than the raised amount on the long side, and further, the concave portion at the central portion thereof. The amount of depression of 14 is also increased. Regarding the above-mentioned amount of bulging on the short side of the raised bottom portion 13 and the amount of depression of the central concave portion 14, depending on the increase and decrease of the difference between the long side and the short side of the bottle cross-sectional shape, further various types can be obtained. It is necessary to add consideration to increase or decrease them depending on the shape of raised bottom.

Next, FIG. 5 shows the amount of each of the above-mentioned heaps and depressions in the intermediate portion between the short side and the long side, respectively. With such consideration, the above-mentioned accumulation of meat can be avoided over the entire circumference of the bottom of the bottle.

That is, as long as the bottom shape is an ellipse, a quadrangle, an oval, or the like, the above-mentioned shape of the bottom ledge 13 is the total length of each wall portion that passes from the bottle bottom peripheral edge to the other peripheral edge Most preferably, are approximately equal. This shape is expected to make the degree of blow stretching of the resin substantially uniform.

Specifically, regarding the 2 liter blow-molded bottle manufactured by the applicant and having a shape shown in FIG. 1, the total length of the bottom raised from the outside of the grounding portion is measured on the major axis side and the minor axis side. As a result, the major axis side in FIG. 8 was 84.48 mm and the minor axis side in FIG. 9 was 62.80 mm, that is, the major axis side was 1 and the minor axis side was 0.74.

On the other hand, regarding the same bottle, the total length of the major axis side of FIG. 3 raised by this invention described above in detail is 84.90 mm, and when this is set to 1, the minor axis side of FIG. 4 is 72.43 mm. In mm it was 0.85. That is, the length was increased compared to the conventional product by the increase in the amount of heap on the short side.

Furthermore, when the above ratios were examined for various prototype bottles having different bottom shapes, it was found that the length on the short side was 0.75 to 1 when the raised total length on the long side was set to 1. Blow molding with such a bottom-up shape gave good results.

[0015]

[Effect of the device]

 As described in detail above, the present invention relates to a blow-molded bottle having a long bottom portion, and the bottom portion of the bottle has a bottom-up configuration as a whole and extends from the periphery of the bottom portion to the center portion, and is shorter than the long side. By increasing the amount of bulging on the side, the degree of blow stretching of the resin at the bottle bottom raising part during the bottle blow molding is made uniform, and the formation of the meat reservoir is significantly reduced or eliminated. As a result, the effect of substantially eliminating the problems of the self-sustaining stability of the bottle and the reduction in strength is exhibited.

[Brief description of drawings]

FIG. 1 is a front view of a bottle according to an embodiment of the present invention.

FIG. 2 is a bottom view of the bottle.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a front view of a conventional bottle.

FIG. 7 is a bottom view of the bottle.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 11 Bottle 12 Bottom 13 Bottom Raising

Claims (2)

[Scope of utility model registration request] 1. A blow-molded bottle having a bottom having a substantially elliptical shape, an oval shape, a quadrilateral shape, or the like having different lengths in the X and Y biaxial directions. A blow-molded synthetic resin bottle characterized in that it has a bottom-up shape, and that the amount of heap from the long side to the short side is increased in accordance with the ratio of the long side / short side from the bottom peripheral edge to the center. 2. The bottle according to claim 1, wherein the raised shape is such that the entire lengths of the rising walls extending from the peripheral edge of the bottle bottom portion to the peripheral edge on the other side are substantially equal.