JPH0752006Y2 - Biaxially stretch blow molded bottle - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is a biaxial stretch blow molding bot.
Relates le, more particularly about the biaxial stretch blow molded bottles which has improved self stability.

[0002]

BACKGROUND OF THE INVENTION near years, with the progress of living diversified, the shape of the synthetic resin bottle for packaging a beverage or the like is also remarkably wide variety diversification. Among them, the cross-sectional shape of the bottle body portion may include the oval or rectangular, they from the short side
In the case of gripping this, there are many advantages such as a good gripping attitude and many are commercially available.

FIG. 6 shows an example of a conventional bottle 1 in which the body has a substantially rectangular shape in which the body has a four-sided cross section. The bottom shape of the bottom 2 of this bottle 1 is clear from FIG.
It is a light street, and the bottom part 2 is raised in a substantially elliptical outline, that is, it is depressed so as to bulge into the bottle . So
And, the bottom raising portion is indicated by reference numeral 3. Above this bottom
As shown in FIGS. 8 and 9, the shape of the barb 3 is on the long side of the bottom 2.
And the height of the ridge is almost uniform on the short side .

[0004]

[Devised Problems to be Solved However, the above-mentioned
In the synthetic resin bottle of this kind, as can be seen from FIGS. 8 and 9, the grounding portion on the long side and the short side of the bottom portion 2 is formed.
There is a difference in the wall thickness of the molding resin at the portion where the raised bottom portion 3 is formed in the vicinity . This is due to the extent of the bottom raising portion of the third resin blow stretching during blow molding, the bottom long side of the
The extent of the side grounding unit (Fig. 9) Naturally blow stretching rather small,
As a result, the wall thickness becomes larger (hereinafter, this is referred to as a meat reservoir).

The occurrence of the reservoir 4 due to the above-mentioned biaxial stretch blow molding is caused by the cross-sectional shape of the bottle, that is, the bottom.
The greater the difference in length between the long side and the short side, the greater the appearance.
It is that has been known to be. And on this long side
The flesh pool 4 near the ground contact portion has a larger shrinkage amount than others at the time of cooling after completion of blow molding, so-called sink marks due to non-uniformity, cooling delay, and low orientation reduce orientation, resulting in resin whitening. such as invited rather than the. As a result, there causes a defect called lowering the self stability and drop strength of the product bottle <br/> problem.

The object of the present invention is to solve the above-mentioned conventional problems.
The cross-sectional shape is a long quadrilateral or
Is an oval bottle with a raised bottom.
Biaxial stretching for improved self-sustaining stability and drop strength
To provide blow molded bottles.

[0007]

SUMMARY OF THE INVENTION The present invention provides a long quadrilateral or
Has an oval bottom and bulges inwardly at this bottom
And a raised bottom portion with a concave portion formed in the central portion 2
In the axial stretch blow molding bottle, the center point of the bottom is
, Along the long side of the bottom shape or extending in the major axis direction
The virtual center axis is the X axis and is orthogonal to this X axis,
A virtual shape that extends along the short side of the bottom shape or in the direction of the minor axis.
When the central axis is the Y-axis, before being located on the Y-axis
The bottom raising part in which the wall of the bottom raising part is located on the X-axis.
Is higher than the wall of the bottom part, and is formed in the center of the raised part.
A portion in which the amount of depression of the formed concave portion is located on the X-axis line
Make the part located on the Y-axis larger than the minute,
And the entire length of the wall portion of the raised bottom portion located on the X axis
The total length of the wall of the raised portion located on the Y-axis is approximately
The feature is that they are almost equal.

Further, the biaxial stretching blow molding of the present invention described above
In the shape bottle, the bottom raised wall portion located on the X-axis is
Raised bottom located on the Y-axis when the total length is 1.
The shape of the wall is approximately 0.75 to 1
It is characterized in that a bottom raised portion is formed.

[0009]

Operation: In the biaxially stretch blow molded bottle of the present invention, the bottom portion is
Includes the case where is formed in a long quadrangle or an ellipse. this
It is equipped with a bottom of such a shape, and the bottom expands inwardly of the bottle.
Form a raised bottom with a recess in the center
The height of the raised part at a predetermined position and the concave part of the concave part.
Try to change the amount.

The change is that it passes through the center point of the bottom and
Virtual central axis extending along the long side of the shape or in the direction of the major axis
Is the X axis and is orthogonal to this X axis, and the short side of the bottom shape
An imaginary central axis extending along or along the minor axis is referred to as the Y axis.
The bottom raised wall located on the Y-axis on the X-axis
It is formed higher than the wall of the bottom raising part located at
The amount of depression of the concave portion formed in the central portion is located on the X-axis line
The part located on the Y-axis line is made larger than the part, so that X
Positioned on the Y-axis and the entire length of the wall of the raised part located on the axis
By making the wall length of the raised part that is
It

The shape of the raised bottom portion thus formed at the bottom portion
The shape (including the concave shape of the central part) has been made unique.
As a result, the degree of stretch blow of the resin is almost uniform and the grounding part
Is it possible to significantly reduce the formation of meat pools that were easily formed in the vicinity?
Or there will be nothing. Therefore, the bottom of this kind of bottle is flat.
It is solidified, which improves self-sustaining stability and drops.
Impact resistance against strength and the like is also improved.

[0012]

[Examples] The biaxially stretch blow molded bottles of the present invention are described below.
The embodiment shown in the figures will be described in more detail. Figure 1
Is a biaxially stretch blow molded bottle according to an embodiment of the present invention.
It is a front view seen from the front, and FIG. 2 is the bottom of the bottle.
FIG. 3, FIG. 3, FIG. 4 and FIG. 5 are respectively AA line and B of FIG.
-Partial bottom of the bottle taken along line B and CC
FIG. 1 to 5, reference numeral 11 represents
Biaxially stretch blow molded bottle, 12 is the bottom of the bottle 11
, 13 are formed on the bottom 12 and bulge into the bottle 11.
As shown in FIG.

As is apparent from FIGS. 3 and 4, this actual
In the biaxially stretch blow-molded bottle of the embodiment, the bottom portion 12 is formed.
Further, a concave portion 14 is formed in the center of the raised bottom portion 13
ing. Then, the bottom raised portion 13 including the recess 14
The shape is as described below. That is,
Now, for convenience of explanation, as shown in FIG.
Tentatively extending along the long side of the bottom shape or in the direction of the major axis.
The central axis of the idea is the X-axis and is orthogonal to this X-axis,
Virtual central axis extending along the short side of the part shape or in the direction of the minor axis
Let the line be the Y-axis.

At this time, cut the bottom along the X-axis.
The vertical cross-sectional shape is shown in Fig. 3 and also along the Y-axis.
The vertical cross-sectional shape obtained by cutting the bottom is shown in FIG. this
As is clear from FIGS. 3 and 4, the bottom located on the Y-axis
The height of the wall portion 13y (FIG. 4) of the raising portion is located on the X axis.
Is formed higher than the wall portion 13x (FIG. 3) of the raised bottom portion.
It

Further, it is formed at the center of the raised bottom portion 13.
The amount of depression of the concave portion 14 is the portion located on the X-axis line (FIG. 3).
The portion located on the Y-axis (Fig. 4) is made larger or deeper.
Has been done. And the bottom located on the Y-axis in this way
Bottom raising part 1 whose wall height of raising part 13 is located on the X-axis
3 is higher than the wall height and the center of the raised bottom portion 13
The amount of depression of the concave portion 14 formed at the position on the X-axis
The part located on the Y-axis from the part to be connected (Fig. 3) (Fig. 4)
The degree of increasing the bottom raised part located on the X-axis
The wall length of 13 and the wall of the raised bottom 13 located on the Y-axis
The total length of the part should be almost equal.

That is, as described above, along the X-axis
A cross-section of the cut bottom raised portion 13 is shown in FIG.
A cross section of the raised bottom 13 taken along the axis is shown in FIG.
But when you look at both of these figures,
The cross-section wall portion 3 (including the cross-section portion of the recess 14) has a substantially total length.
It is supposed to be equal.

By the way, on the Y-axis line in the raised bottom portion 13.
And the above-mentioned height of the wall of the raised bottom portion 13 located at
And the amount of depression of the concave portion 14, the long side of the bottle cross-sectional shape
And, according to the increase and decrease of the difference of the short side, further raising various bottom
It is necessary to adjust them depending on the shape.
It

Next, FIG. 5 shows the angle formed by the X-axis and the Y-axis.
Above the bisector of degrees, that is, on the bottom diagonal
The raised state of the raised portion 13 and the depression of the recess 14
Each amount is the bottom raising part 1 located on the X-axis shown in FIG.
3, the height of the wall portion and the amount of depression of the concave portion 14 are shown in FIG.
Wall height of the raised bottom portion 13 located on the Y-axis and the recess 1
It shows that it is formed with an almost intermediate value with the dent amount of 4
ing.

By forming the bottom of such a configuration
The entire circumference of the bottom of the biaxially stretch blow molded bottle is
Therefore, the above-mentioned formation of the puddles is avoided. You
Chi match for, if the shape of the bottom portion has an elliptical or long quadrilateral or the like,
Pass the shape of the bottom raised part 13 from the peripheral edge of the bottle bottom to the center.
The length of the wall that reaches the other edge is cut at any arbitrary position.
Form so that the cut vertical sections are almost the same.
Is most preferred. The shape of the raised bottom is described above
By doing so, when molding a synthetic resin bottle, the resin
That is, the degree of stretching and blowing is substantially uniform.

Specifically, as shown in FIG. 1 which is commercially available.
2 liter biaxially stretched bulge whose cross section is long quadrilateral
Regarding the low-molded bottle, the bottom located on the above-mentioned X-axis
Raising the cross-section wall of the raising part (Fig. 8) and bottom raising on the Y-axis
Length of each section wall (Fig. 9) (outside one site)
The length of the wall from one side to the outside of the other ground) was measured.
However, the former is 84.48 mm and the latter is 62.80 mm.
When expressed as a ratio, the ratio is 1: 0.74.

On the other hand, according to the present invention, the actual shape is
Formed at the bottom for similarly shaped bottles made
When the bottom raising part 13 was actually measured, it was on the bottom cut along the X-axis.
Of the cross-section wall of the barb (Fig. 3) and the raised part cut along the Y-axis
The total length of each of the cross-section wall portions (Fig. 4) is 84.9 for the former.
0 mm and the latter was 72.43 mm. So the X axis
Length of cross-section wall of bottom raised part cut by line (84.90m
If m) is set to 1 and expressed as a ratio, it is 1 to 0.85.
The number of walls on the Y-axis is increased compared to the others.
The length has been increased compared to conventional products by the amount
I understand.

Further, according to the present invention, the bottom shape is different.
For various prototype bottles, on the X-axis as described above
The wall of the raised bottom and the raised bottom located on the Y-axis
The length ratio with the wall of the
Position on the Y-axis when the length of the bottom raised wall is 1
The bottom raised wall portion to be placed is in the range of approximately 0.75 to 1
As mentioned above, it is possible to perform biaxial stretch blow molding with such a raised shape.
It became clear that the occurrence of the accumulated meat can be suppressed.

[0023]

As described above, according to the present invention,
It has an oblong or elliptical bottom and this bottom has an inward
A raised bottom with a bulge and a recess in the center is formed
Center of the bottom of the biaxially stretched blow molded bottle
Extends along the long side of the bottom shape or through the points through the points
The virtual center axis is the X axis and is orthogonal to this X axis,
Virtual center extending along the short side of the bottom shape or in the direction of the minor axis
When the axis is the Y-axis, the bottom raised part located on the Y-axis
The wall is formed higher than the wall of the raised part located on the X-axis
And the amount of depression of the concave portion formed at the center of the raised portion is X
The part on the Y-axis is larger than the part on the axis
The comb, and thereby the wall of the raised bottom located on the X-axis
Approximately the total length and the entire length of the wall of the raised bottom located on the Y-axis
By making them equal, the conventional method, for example, long sides
Long side of the bottom of a biaxially stretch blow molded bottle with a shaped bottom
Side (major axis direction) and short side (minor axis direction) grounding part
Molded resin that appeared in the raised part forming part in the vicinity
There is no difference in the wall thickness of the product bottle, resulting in the self-reliance of the product bottle.
Qualitative and drop strength can be improved.

[Brief description of drawings]

FIG. 1 is a biaxial stretch blow molding machine according to an embodiment of the present invention.
It is a front view which shows a tor .

FIG. 2 is the bottom of the biaxially stretch blow molded bottle shown in FIG .
It is a bottom view which shows a part .

FIG. 3 Bottom of the biaxially stretch blow molded bottle shown in FIG.
It is a partial longitudinal cross-sectional view of the portion taken along the line AA.

FIG. 4 is the bottom of the biaxially stretch blow molded bottle shown in FIG.
It is a partial longitudinal cross-sectional view of the portion taken along the line BB.

5 is the bottom of the biaxially stretch blow molded bottle shown in FIG.
It is a partial longitudinal cross-sectional view of the portion taken along the line C-C.

[FIG. 6] A conventional 2 in which the cross section of the bottle body is a long quadrangle.
It is a front view which shows an axial stretch blow molding bottle .

FIG. 7 is a conventional biaxial stretch blow molding bot shown in FIG .
It is a bottom view which shows the bottom part of a le .

8 is a conventional biaxial stretch blow molding bot shown in FIG.
FIG. 7 is a partial vertical cross-sectional view of the bottom of the louver taken along line D-D .

9 is a conventional biaxial stretch blow molding bot shown in FIG.
FIG. 7 is a partial vertical cross-sectional view of the bottom of the louver taken along line EE .

[Explanation of symbols]

11 Bottle 12 Bottom Part 13 Bottom Raising Part 13x Cross-sectional Wall Part of Bottom Raising Part Located on X Axis 13y Cross Section Wall Part 14 of Bottom Raising Part Positioned on Y Axis

Claims (2)

[Scope of utility model registration request] 1. A rectangular parallelepiped or oval bottom is provided.
The bottom part bulges inward and a concave part is formed in the center part.
For biaxially stretch blow molded bottles with raised bottom
Through the center point of the bottom and along the long side of the bottom shape.
Is an imaginary center axis extending in the major axis direction, and
Orthogonal to the X-axis of, along the short side of the bottom shape or the short diameter
When the virtual central axis extending in the direction is defined as the Y axis,
The wall portion of the raised portion located on the axis line is aligned with the X axis line.
It is formed to be higher than the wall of the bottom raised portion located,
The amount of depression of the concave portion formed at the center of the raised portion is X
A portion located on the Y-axis from a portion located on the axis
The bottom, which is located on the X-axis.
The entire length of the wall of the raising part and the bottom raising located on the Y-axis
A biaxially stretched blow-molded bottle characterized in that the entire length of the wall of the portion is made substantially equal . 2. The bottom raised wall portion located on the X-axis
Raised bottom located on the Y-axis when the total length is 1.
The shape of the wall is approximately 0.75 to 1
The biaxially stretched blow-molded bottle according to claim 1 , wherein the raised bottom portion is formed .