JP2006240728A - Plastic bottle container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic bottle container which can suppress nonuniform deformation while assuring reduced pressure absorption performance, and has a shape capable of stably molding without causing a trouble in mold-die opening after molding when reducing the capacity of a plastic bottle container. <P>SOLUTION: A reduced pressure absorption panel 6 is formed between a plurality of pillar parts 8 disposed on the same circumference, and the pillar parts 8 and the reduced pressure absorption panel 6 are opposed in the radial direction. The reduced pressure absorption panel 6 is positioned in the range surrounded by a circular arc R3 which is convex outward the container of curvature radius of ϕ mutually contacting a circular arc R1 of curvature radius of ϕ×3/4 which is convex outward the container passing through both the ends of the reduced pressure absorption panel 6 at the middle point on the horizontal section wherein ϕ is the maximum outside diameter of the container 1, a circular arc R4 which is convex inward the container of curvature radius ϕ×3/2 mutually contacting a circular arc R2 of curvature radius ϕ which is convex inward the container passing through the both ends of the reduced pressure absorption panel 6 at the middle point, and straight lines L1, L2 connecting the center of the container and both the ends of the reduced pressure absorption panel 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plastic bottle container that can suppress non-uniform deformation while ensuring reduced pressure absorption performance.

  For example, as a bottle container for beverages such as carbonated beverages such as cola and cider, fruit juice beverages, mineral water, coffee beverages, and various teas, a synthetic resin such as polyethylene terephthalate is molded into a predetermined shape by blow molding or the like. Plastic bottle containers are generally widely used (see, for example, Patent Documents 1 to 3).

  In recent years, this kind of plastic bottle container has been rapidly spread and penetrated, and with the widespread use, products using the plastic bottle container have been diversified. Under such circumstances, plastic bottle containers of various capacities have been demanded depending on the contents, from those having a large capacity exceeding 2000 ml to those having a small capacity of about 200 ml.

JP 2003-63516 A JP 2001-206331 A Japanese National Patent Publication No. 11-513639

  By the way, this type of plastic bottle container is usually provided with a reduced pressure absorption structure for preventing a change in the shape of the container with a decrease in the internal pressure because the inside of the container after filling and sealing the contents is in a reduced pressure state. Yes.

  Here, as an example of a container having such a reduced pressure absorption structure, Patent Document 1 discloses a synthetic resin container in which a plurality of reduced pressure absorption parts that are elastically deformed are arranged in a circumferential direction on a cylindrical body part. Has been. Patent Document 2 discloses a plastic bottle in which the cross section of the bottle body is octagonal, and a reduced pressure absorption surface is disposed between arcuate wall surfaces formed at the corners. A bottle-shaped plastic container having an odd number of spaced panels that respond to changes in internal pressure in the container is disclosed.

  However, as a result of extensive studies by the present inventors, for example, it is inconvenient to directly apply these reduced pressure absorption structures to a small-capacity plastic bottle container having a capacity of about 200 ml, and there is still room for improvement. It came to acquire the knowledge that it is.

That is, when trying to reduce the capacity of the plastic bottle container, the area of the reduced pressure absorption panel (reduced pressure absorption portion) is also reduced, so that it is difficult to obtain sufficient reduced pressure absorption performance. Furthermore, when the volume of the container is reduced, the volume of the head space (the part where the contents are not filled) after filling and sealing the contents becomes relatively large, and the inside of the container is decompressed accordingly. The degree will also increase.
For this reason, in a small capacity plastic bottle, there is a strong tendency for the amount of vacuum absorption to be insufficient, and in particular, as disclosed in Patent Document 1 and Patent Document 2, six or eight in the circumferential direction of the body portion. For plastic bottle containers equipped with a vacuum absorption panel on the surface, if the vacuum absorption amount is insufficient, forcibly deforming each vacuum absorption panel, all the vacuum absorption panels will not be deformed equally. In addition, there is a disadvantage that the horizontal cross section is easily deformed into an uneven shape such as an elliptical shape or a rice ball shape. Such non-uniform deformation is not preferable because it significantly impairs the commercial value.

On the other hand, in Patent Document 3, although the odd-numbered panels (vacuum absorption panels) are spaced apart from the main body of the container, the problem of irregular distortion of the container can be eliminated, but the decompression strength is still unsatisfactory. There was a problem that the container was crushed at a relatively low pressure.
Also, when trying to mold a container with an odd number of panels using a mold consisting of a pair of two left and right (or upper and lower) split molds, the panel is located on the parting line of the mold, Although the container and the mold interfere with each other and the container may be deformed or damaged when the mold is opened, the product yield may be reduced. However, in Patent Document 3, there is no such problem. Not considered. It is conceivable to combine three or more divided molds so as not to hinder mold opening, but this is not preferable because the mold structure becomes complicated.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and in reducing the capacity of a plastic bottle container, non-uniform deformation is ensured while ensuring vacuum absorption performance. An object of the present invention is to provide a plastic bottle container having a shape that can be suppressed and that can be stably molded without hindering mold opening after molding.

  A plastic bottle container according to the present invention is a plastic bottle container having a mouth portion, a body portion, and a bottom portion, and the body portion is formed between a plurality of column portions disposed on the same circumference. And the column part and the vacuum absorption panel are opposed to each other in the radial direction, and at least one of the vacuum absorption panels is inside the container rather than a circumference connecting the column parts. The curvature radius is φ × 3/4 with respect to the maximum outer diameter φ of the container, and the curvature is in contact with the arc R1 protruding outward from the container passing through both ends of the vacuum absorption panel in the horizontal section at the midpoint. A radius of curvature that is a convex arc R3 that protrudes outward from the container having a radius of φ, a radius of curvature of φ, and that is in contact with the arc R2 that protrudes inward of the container passing through both ends of the vacuum absorption panel in the horizontal section at the midpoint. A circular arc R4 convex inward of a φ × 3/2 container, Beauty, it is constituted to be located within a region surrounded by the straight lines L1, L2 connecting the both ends of the vacuum panels in the container center and the horizontal cross-section.

  By setting it as such a structure, while being able to improve decompression absorption performance, the nonuniform deformation | transformation of a container can be suppressed. Furthermore, by forming the vacuum absorbing panel located at least on the parting line of the mold so as not to interfere with the mold opening within the above range, a plastic bottle container excellent in vacuum absorbing performance can be stably molded. be able to.

Moreover, the plastic bottle container which concerns on this invention can be set as the structure which the said pillar part is located on the perpendicular bisector of the line | wire which connects the both ends of the said pressure reduction absorption panel in a horizontal cross section.
By adopting such a configuration, non-uniform deformation of the container can be avoided more effectively.

Moreover, the plastic bottle container which concerns on this invention can be set as the structure provided with the five-sided pressure reduction absorption panel.
By adopting such a configuration, it is possible to improve the vacuum absorption performance and suppress uneven deformation of the container without impairing the container form as a round bottle.

Moreover, the plastic bottle container which concerns on this invention can be set as the structure which made two said pillar parts oppose with respect to at least one of the said pressure reduction absorption panels.
By setting it as such a structure, the nonuniform deformation | transformation of a container can be suppressed more effectively.

Moreover, the plastic bottle container which concerns on this invention can make the central angle of the pillar part in a horizontal cross section into 6 degrees or more.
By setting it as such a structure, the decompression absorption performance of a decompression absorption panel can be improved, ensuring the function as a structure part of a pillar part.

  According to the present invention as described above, a plastic that has high vacuum absorption performance, can suppress non-uniform deformation, and can be stably molded without hindering mold opening after molding. A bottle container can be provided.

Hereinafter, a preferred embodiment of a plastic bottle container according to the present invention will be described with reference to the drawings.
Here, FIG. 1 is a front view showing an outline of an embodiment of a plastic bottle container according to the present invention.

  A container 1 shown in FIG. 1 generally has a container shape called a round bottle, and includes a mouth part 2, a body part 3, and a bottom part 4. The trunk portion 3 includes a cylindrical portion 32 formed in a cylindrical shape having substantially the same diameter, and a shoulder portion 31 that is squeezed from the upper end of the cylindrical portion 32 and continues to the mouth portion 2.

  A lateral bead 5 a is formed along the circumferential direction of the container 1 at the boundary between the shoulder portion 31 and the cylindrical portion 32. A lateral bead 5 b is also formed along the circumferential direction of the container 1 at the boundary between the body portion 3 (tubular portion 32) and the bottom portion 4. A rib portion 7 a is formed on the cylindrical portion 32 side along the horizontal bead 5 a formed at the boundary between the shoulder portion 31 and the cylindrical portion 32, and the horizontal portion formed at the boundary between the trunk portion 3 and the bottom portion 4. Ribs 7b are also formed on the body 3 (tubular portion 32) side along the bead 5b.

As shown in FIG. 2, the cylindrical portion 32 extends along the height direction, and both upper and lower ends thereof are connected to the rib portions 7 a and 7 b, respectively, and function as columnar structural portions. Are formed at substantially equal intervals along the circumferential direction so as to be arranged on the same circumference (indicated by a two-dot broken line in the figure), and by the rib portions 7a and 7b and the column portion 8. A vacuum absorbing panel 6 is defined.
Here, FIG. 2 shows the AA cross section of FIG. 1, but only the outer line on the outer surface side of the container 1 (tubular portion 32) is shown in the drawing, and the inner surface side is omitted. Further, the height direction means a direction along a direction perpendicular to the horizontal plane when the container 1 is placed on the horizontal plane with the mouth portion 2 facing up.

  When the internal pressure of the container 1 decreases, the reduced pressure absorption panel 6 is gently deformed inward of the container 1 to absorb the decrease in pressure. In this embodiment, between the adjacent column portions 8, The reduced pressure absorption panel 6 to be formed is positioned inside the container 1 from the circumference connecting the column portions 8. By doing in this way, when the internal pressure of the container 1 decreases, the decompression absorption panel 6 becomes easy to deform | transform toward the inner side of the container 1, and the load which acts in the container 1 at the time of pressure reduction is reduced more. Therefore, the reduced pressure strength of the container 1 can be improved.

Further, in the illustrated example, a five-sided vacuum absorption panel 6 is formed along the circumferential direction of the container 1, but this is because the vacuum absorption panel 6, the column part 8, This is to prevent uneven deformation of the container 1 so that the deformation amount of the individual reduced pressure absorption panels 6 during pressure reduction is less likely to be biased.
Therefore, as long as the reduced pressure absorption panel 6 and the column portion 8 are in a positional relationship facing each other in the radial direction, the number of surfaces of the reduced pressure absorption panel 6 is not limited to five, and may be three or seven. . However, it is particularly preferable that the number of surfaces of the reduced pressure absorption panel 6 is five in order to improve the reduced pressure absorption performance and not to damage the container form as a round bottle.

Further, in suppressing uneven deformation of the container 1, the positional relationship between the reduced pressure absorption panel 6 and the column portion 8 is such that the column is on a vertical bisector of a line connecting both ends of the reduced pressure absorption panel 6 in the horizontal section. It is preferable that the portion 8 (particularly, the central portion of the column portion 8) is positioned. However, in this embodiment, the reduced pressure absorption panel 6 and the column portion 8 are opposed to each other in a one-to-one manner. Not limited to this, as shown in FIG. 3, the non-uniform deformation of the container 1 can be more effectively performed by performing deformation in a mode in which the two column portions 8 face each other with respect to one vacuum absorption panel 6. It can also be suppressed.
Here, FIG. 3 shows a portion corresponding to the AA cross section of FIG. 1 in such a modification, and the inner surface side of the container is omitted as in FIG. Further, the boundary between the reduced pressure absorption panel 6 and the column part 8 means a part where the column part 8 is disengaged inward from the circumference connecting the outer surfaces of the column part 8 for convenience. Therefore, the line connecting the both ends of the reduced pressure absorption panel 6 in the horizontal section is, in other words, a line connecting the end portions of the adjacent column portions 8 on the reduced pressure absorption panel 6 side with the reduced pressure absorption panel 6 interposed therebetween. .

  In the modification shown in FIG. 3, the three reduced pressure absorption panels 6 are formed at substantially equal intervals along the circumferential direction, and the two column portions 8 face the one reduced pressure absorption panel 6. A reduced pressure absorption panel 6a is formed between the two column portions 8. The width W2 of the reduced pressure absorption panel 6a formed between the two column portions 8 facing the reduced pressure absorption panel 6 needs to be smaller than the width W1 of the opposite pressure absorption panel 6; specifically, The width W2 of the reduced pressure absorption panel 6a is preferably less than or equal to ½ of the width W1 of the reduced pressure absorption panel 6. Further, the vacuum absorbing panel 6 and the vacuum absorbing panel 6a facing each other are a vertical bisector of a line connecting both ends of the vacuum absorbing panel 6 and a vertical bisector of a line connecting both ends of the vacuum absorbing panel 6a. It is preferable to set the positional relationship between the two so as to match.

  Since the configuration other than the above is the same as the example shown in FIGS. 1 and 2, detailed description of other configurations of the modification shown in FIG. 3 is omitted.

Thus, in this embodiment, since the decompression absorption panel 6 and the column part 8 are formed in the position which opposes in a radial direction, the container 1 is made from a pair of two right and left (or upper and lower) divided types. If the mold is to be formed, the parting line PL of the mold will be located on the reduced pressure absorption panel 6, and the shape of the reduced pressure absorption panel 6 will interfere with the mold, which will hinder the mold opening. May occur. Further, if the reduced-pressure absorption panel 6 is convex outwardly from the container 1 while avoiding interference with the mold, it is difficult to obtain sufficient reduced-pressure absorption performance.
Therefore, in this embodiment, it is necessary to determine the shape of the reduced pressure absorption panel 6 in consideration of not only the reduced pressure absorption performance but also the interference with the mold when the mold is opened.

For this reason, in the present embodiment, as shown in FIG. 2, the reduced pressure absorption panel 6 positioned at least on the parting line PL has a maximum outer diameter φ of the container 1 (tubular portion 32). The curvature radius is φ × 3/4, and the outer side of the container 1 passing through both ends of the vacuum absorption panel 6 in the horizontal cross section is in contact with the arc R1 that protrudes outward from the container 1 at the midpoint. Convex arc R3, the radius of curvature is φ, and the radius of curvature is φ × 3/2 which is in contact with the inwardly convex arc R2 of the container 1 passing through both ends of the vacuum absorbing panel 6 in the horizontal cross section at the midpoint. Is located in a range (range shown by hatching in the figure) surrounded by a circular arc R4 projecting inward and straight lines L1 and L2 connecting the center of the container and both ends of the decompression panel in the horizontal section. More preferably, the reduced pressure absorption panel 6 positioned at least on the parting line PL is preferably positioned in a range surrounded by the arcs R1 and R2.
If the reduced pressure absorption panel 6 is positioned in such a range while making the mold opening favorable, the reduced pressure absorption performance of the reduced pressure absorption panel 6 can be improved.

  In order to effectively avoid the uneven deformation of the container 1, it is preferable to form all the reduced pressure absorption panels 6 equally as shown in the figure. Strictly speaking, depending on the thickness of the container 1 (cylindrical portion 32), there may be a portion where the reduced pressure absorption panel 6 protrudes from the above range, but in the present invention, the outer surface side of the reduced pressure absorption panel 6 is present. The outer shape line should just be located in the said range. Further, for convenience, the boundary between the reduced pressure absorption panel 6 and the column portion 8 is the portion where the column portion 8 is removed from the circumference connecting the outer surface of the column portion 8 to the inside of the container as described above. . Therefore, the circular arcs R1 and R2 passing through both ends of the reduced pressure absorption panel 6 pass through the part where the outer surface of the column part 8 is deviated from the circumference to the inside of the container.

  Further, in order to improve the reduced pressure absorption performance of the reduced pressure absorption panel 6, it is important to secure the area of the reduced pressure absorption panel 6. For this reason, in the present embodiment, the size of the column portion 8 that defines the reduced pressure absorption panel 6 (ratio to the side surface of the cylindrical portion 32) is reduced while ensuring the function of the column portion 8 as a structural portion. It is preferable that the balance be set so that the area of the absorption panel 6 is as large as possible.

Specifically, the central angle of the column part 8 in the horizontal section (the angle formed by two sides connecting the circumferential ends of the column part 8 and the center of the container 1 in the horizontal section) θ is 6 ° or more. Is preferable. If the central angle θ of the column portion 8 is less than 6 °, the function of the column portion 8 as a columnar structural portion is not sufficiently exhibited, and the decompression strength of the container 1 becomes insufficient. The central angle θ is preferably 20 ° or less. When the central angle θ of the column portion 8 exceeds 20 °, the area of the column portion 8 occupying the side surface of the cylindrical portion 32 increases, and thereby the area of the reduced pressure absorption panel 6 becomes relatively small. The vacuum absorption performance cannot be obtained.
In the example shown in FIG. 2, the central angle θ of the column portion 8 is 10 °.

In the present embodiment, the specific shape of the reduced pressure absorption panel 6 is not limited to a rectangular shape as shown in the figure, but may be a vertically long shape such as an elliptical shape or a track shape. Further, the vacuum absorption panel 6 is not configured as a mere plane, but is provided at the center of the vacuum absorption panel 6 for the purpose of increasing the vacuum absorption amount by the vacuum absorption panel 6 or increasing the vacuum strength. An appropriate uneven shape can be provided within a range that does not cause a problem in mold opening, such as forming a convex portion as shown in the figure.
The same applies to the decompression panel 6a in the above-described modification.

The plastic bottle container according to the present embodiment as described above can be manufactured, for example, by biaxial stretch blow molding of a bottomed cylindrical preform manufactured by known injection molding or extrusion molding. it can.
Further, as the thermoplastic resin constituting the container, any resin can be used as long as stretch blow molding is possible.

Specifically, blended with polyethylene terephthalate, polybutylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid or copolymers thereof, these resins or other resins In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used. Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can be used.
In these resins, various additives such as a colorant, an ultraviolet absorber, a release agent, a lubricant, a nucleating agent, an antioxidant, an antistatic agent and the like are blended as long as the quality of the molded product is not impaired. You can also.

In the ethylene terephthalate thermoplastic polyester, most of the ester repeating units (for example, 70 mol% or more) are occupied by ethylene terephthalate units, the glass transition point (Tg) is 50 to 90 ° C, and the melting point (Tm) is 200 to 275 ° C. Those within the range are preferred.
As the ethylene terephthalate thermoplastic polyester, polyethylene terephthalate (PET) is particularly excellent in terms of pressure resistance, heat resistance, heat pressure resistance, etc. In addition to the ethylene terephthalate unit, isophthalic acid, naphthalenedicarboxylic acid, or cyclohexanedicarboxylic acid, etc. Copolyesters containing a small amount of a dibasic acid or a diol such as propylene glycol can also be used.

Further, the plastic bottle container according to the present embodiment can be constituted by two or more thermoplastic polyester layers in addition to the case of being constituted by a single layer (one layer) of thermoplastic polyester layer. Furthermore, an intermediate layer sealed between an inner layer and an outer layer composed of two or more thermoplastic polyester layers can be provided, and the intermediate layer can be a barrier layer or an oxygen absorbing layer. Thus, by providing the barrier layer and the oxygen absorbing layer, it is possible to suppress the permeation of oxygen from the outside into the container, and to prevent the alteration of the contents in the container due to the oxygen from the outside.
Here, as the oxygen absorbing layer, any layer can be used as long as it absorbs oxygen and prevents permeation of oxygen, but a combination of an oxidizable organic component and a transition metal catalyst, or substantially oxidized. It is preferred to use a combination of non-gas barrier resin, oxidizable organic component and transition metal catalyst.

Next, the present invention will be described in more detail with reference to specific examples.
[Example 1]
Polyethylene terephthalate (PET) was supplied to an injection molding machine to produce a preform having an outer diameter of about 25 mm, a height of about 80 mm, and an average thickness of about 4 mm. This preform is heated to about 100 ° C above the glass transition point (Tg), set in a pair of left and right two-part molds heated to about 150 ° C, and blow air is supplied at a pressure of about 3 MPa. Then, biaxial stretch blow molding was performed to obtain a plastic bottle container having a volume of about 200 ml as shown in FIGS.
At this time, as shown in FIG. 2, the parting line PL of the mold was positioned on the reduced pressure absorption panel 6, but the molded container without interference between the container and the mold when the mold was opened. Can be removed from the mold, and no defects such as deformation or damage were found in the container removed from the mold.

Here, the resulting dimensions of the container 1 has a height H of about 150 mm, (the length from immediately below the mouth portion 2 to the center line C ₁ of the lateral bead 5a) height direction of the length of the shoulder portion 31 h ₁ Is about 28 mm, the length of the cylindrical portion 32 in the height direction (the length between the center line C ₁ of the horizontal bead 5 a and the center line C ₂ of the horizontal bead 5 b) h ₂ is about 75 mm, and the height of the bottom 4 direction length (length from the center line _{C 2} of the lateral bead 5b to the bottom of the container 1) _{h 3} was about 12 mm.
Further, the maximum diameter φ of the body part 3 (tubular part 32) is about 54 mm, the average thickness of the body part 3 (tubular part 32) is about 0.6 mm, and the central angle θ of the column part 8 in the horizontal section is 10 mm. °.

The container 1 obtained in this manner was filled with water up to the upper end of the mouth part 2, and suctioned under reduced pressure from the mouth part 2 until the container 1 was deformed or crushed unevenly. FIG. 10 shows a graph showing the relationship between the reduced pressure strength (load acting in the container 1) and the amount of water sucked (corresponding to the reduced pressure absorption amount) at this time.
In addition, the same measurement was performed also about the container obtained in the following Examples 2-3 and Comparative Examples 1-4, and the result was combined with FIG.

[Example 2]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. In this embodiment, the vacuum absorbing panel 6 is formed closer to the arc R1 than in the first embodiment, and the central angle θ of the column portion 8 is set to 10 ° as in the first embodiment.
Here, FIG. 4 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this example, and the inner surface side of the container is omitted as in FIG.

[Example 3]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. In this embodiment, the vacuum absorbing panel 6 is formed closer to the arc R2 than in the first embodiment, and the central angle θ of the column portion 8 is set to 10 ° as in the first embodiment.
Here, FIG. 5 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this example, and the inner surface side of the container is omitted as in FIG.

[Comparative Example 1]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. In this comparative example, the reduced pressure absorption panel 6 has six sides, and the central angle θ of the column portion 8 is 10 ° as in the first embodiment.
Here, FIG. 6 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this comparative example, and the inner surface side of the container is omitted as in FIG.

[Comparative Example 2]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. This comparative example includes the same vacuum absorbing panel 6 as in Example 1, but the central angle θ of the column portion 8 is set to 4 ° different from Example 1.
Here, FIG. 7 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this comparative example, and the inner surface side of the container is omitted as in FIG.

[Comparative Example 3]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. This comparative example includes the reduced pressure absorption panel 6 similar to that of the comparative example 1, but the central angle θ of the column portion 8 is different from that of the comparative example 1 to 4 °.
Here, FIG. 8 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this comparative example, and the inner surface side of the container is omitted as in FIG.

[Comparative Example 4]
A bottle container having a volume of about 200 ml was obtained in the same manner as in Example 1 except that the horizontal sectional shape of the container was as shown in FIG. In this comparative example, the reduced pressure absorption panel 6 is formed so as to include a portion located on the outer side of the container with respect to the arc R2, and the central angle θ of the column portion 8 is 10 ° as in the first embodiment. It was.
Here, FIG. 9 shows a portion corresponding to the AA cross section of FIG. 1 in the container obtained in this comparative example, and the inner surface side of the container is omitted as in FIG.

As shown in FIG. 10, Examples 1 to 3 showed high decompression strength and a large amount of decompression absorption, and good results were obtained. In Examples 2 and 3, as in Example 1, when the container was taken out from the mold, the container was not deformed or damaged.
On the other hand, those of Comparative Examples 1, 3, and 4 had low vacuum strength and low vacuum absorption. Moreover, although the thing of the comparative example 2 shows comparatively high decompression intensity | strength compared with the comparative examples 1, 3, and 4, since the function as a structure part of the pillar part 8 is inferior, the thing of Examples 1-3 is shown. It did not reach the indicated vacuum strength. In Comparative Example 4, some of the plurality of molded containers were found to have scratches that seemed to be caused by interference with the mold when the mold was opened.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  The present invention can also be applied to a relatively large-capacity plastic bottle container having a volume of about 500 to 2000 ml. However, the present invention is particularly suitable for a plastic bottle container having a volume of 500 ml or less, particularly about 50 to 400 ml. is there.

  As described above, the plastic bottle device according to the present invention can be widely used as a bottle container for filling and sealing various contents, particularly as a heat-resistant bottle container for filling the contents at a high temperature.

It is a front view which shows the outline of one Embodiment of the plastic bottle container which concerns on this invention. It is AA sectional drawing of FIG. It is sectional drawing which shows the site | part corresponded to the AA cross section of FIG. 1 in the modification of one Embodiment of the plastic bottle container which concerns on this invention. It is sectional drawing which shows the horizontal cross section of Example 2 equivalent to the AA cross section of FIG. It is sectional drawing which shows the horizontal cross section of Example 3 equivalent to the AA cross section of FIG. It is sectional drawing which shows the horizontal cross section of the comparative example 1 corresponded to the AA cross section of FIG. It is sectional drawing which shows the horizontal cross section of the comparative example 2 equivalent to the AA cross section of FIG. It is sectional drawing which shows the horizontal cross section of the comparative example 4 equivalent to the AA cross section of FIG. It is sectional drawing which shows the horizontal cross section of the comparative example 5 equivalent to the AA cross section of FIG. It is a graph which shows the relationship between the reduced pressure intensity | strength of a container obtained by Examples 1-3 and Comparative Examples 1-4, and the reduced pressure absorption amount.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Mouth part 3 Body part 31 Shoulder part 32 Cylindrical part 4 Bottom part 6 Pressure-reduction absorption panel 8 Pillar part R1 The outward arc of the container which passes through both ends of a pressure-reduction absorption panel Convex arc φ Maximum outer diameter of container θ Center angle of column

Claims (5)

A plastic bottle container having a mouth, a body, and a bottom,
The body includes a reduced pressure absorption panel formed between a plurality of pillars disposed on the same circumference;
While the pillar portion and the reduced pressure absorption panel are opposed in the radial direction,
At least one of the reduced pressure absorption panels is
It is inside the container than the circumference connecting the pillars,
Radius of curvature having a radius of curvature of φ × 3/4 with respect to the maximum outer diameter φ of the container and in contact with the arc R1 protruding outward from the container passing through both ends of the vacuum absorption panel in the horizontal section at the midpoint A circular arc R3 convex outward of the container with
An arc convex toward the inside of the container having a radius of curvature of φ × 3/2 and in contact with the arc R2 that is convex toward the inside of the container passing through both ends of the vacuum absorbing panel in the horizontal cross section at the midpoint. R4,
And straight lines L1, L2 connecting the center of the container and both ends of the vacuum absorbing panel in the horizontal section
A plastic bottle container that is located in a range surrounded by   The plastic bottle container according to claim 1, wherein the column part is located on a vertical bisector of a line connecting both ends of the vacuum absorption panel in a horizontal section.   The plastic bottle container of any one of Claims 1-2 provided with the reduced pressure absorption panel of 5 sides.   The plastic bottle container according to claim 1, wherein the two column portions are opposed to at least one of the reduced pressure absorption panels.   The plastic bottle container according to any one of claims 1 to 4, wherein a central angle of the column portion in the horizontal section is 6 ° or more.

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