JP5950180B2 - Plastic bottle - Google Patents

Description

The present invention is a synthetic resin bottle, in particular, the contents of regard bottle heat for direct blow-molded article to hot filling, has a body portion having a high shape shape retention, when the inside becomes depressurized The present invention relates to a synthetic resin bottle that absorbs this reduced pressure by a depression-like deformation of the bottom wall of the bottom.

  Conventionally, as a method of filling contents such as fruit juice and tea that require sterilization into a synthetic resin bottle, there is a so-called heat filling method, and the contents are put into a bottle at a temperature of about 90 ° C. The bottle is filled, sealed with a cap, and then cooled, but the inside of the bottle is considerably decompressed.

  For this reason, for applications involving heat filling, a vacuum absorbing panel that absorbs the vacuum generated in the bottle by sinking deformation is formed in the body, thereby maintaining a constant appearance and parts other than the vacuum absorbing panel There is known a bottle in which the rigidity of the bottle is ensured.

  However, if a vacuum absorption panel cannot be formed on the barrel due to design requirements related to the appearance of the bottle, or if it is necessary to maintain high rigidity of the barrel surface due to a request to maintain a constant shape, There is a prior art disclosed in Japanese Patent Application Laid-Open No. 08-048322, in which a reduced pressure absorption function portion is formed on the bottom wall portion of the bottom of the bottle without forming a reduced pressure absorption panel.

  This prior art is constructed by forming a reduced pressure absorption surface 6 which is a reduced pressure absorption function portion depressed by a bellows wall structure on the bottom wall of the bottom portion 5, and this reduced pressure absorption in a state where reduced pressure is generated in the bottle. When the surface 6 is deformed in a form extending inward of the bottle, a reduced pressure absorption operation for absorbing the reduced pressure generated in the bottle is performed.

Japanese Patent Laid-Open No. 08-048322

  However, in the above-described prior art, the reduced-pressure absorption surface is formed within a limited area range called the bottom, and the extent of the depression is increased by the expansion and deformation of the bellows wall structure. Since it exhibits a reduced pressure absorption action, there is a problem that the degree of reduced pressure absorption obtained is small and a sufficient reduced pressure absorption effect cannot be obtained.

  In addition, the bottom wall of the bottom where the reduced pressure absorption surface is formed is a portion with a small amount of stretching deformation when the bottle is stretch-molded. There is a problem that it is difficult to perform the reduced pressure absorption deformation smoothly, and it is difficult to perform a smooth reduced pressure absorption operation.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and sufficiently enhances the degree of vacuum absorption and the ease of vacuum absorption deformation in the vacuum absorption bottom wall formed at the bottom of the bottle. This is a technical problem, and is intended to smoothly exhibit sufficient vacuum absorption capacity.

The main configuration of the present invention for solving the above technical problem is:
It the contents a synthetic resin bottle for heat resistance to hot filling,
Forming a vacuum absorbing bottom wall portion comprising a space forming functional portion and a vacuum absorbing functional portion at the bottom;
The space forming function part that forms a space where the decompression absorbing function part is located by being depressed and deformed in the bottle is connected to the protrusion leg wall forming the leg and the inner peripheral edge of the protrusion leg wall, Having a space forming taper wall that can be reversed by reversing the diameter, and a short cylindrical support tube wall piece that is connected to the lower end of the space forming taper wall;
The reduced pressure absorption functional part is provided continuously with the lower end of the support cylindrical wall piece, and has a reverse cylindrical wall that can be reversely deformed by reducing its diameter downward, and a central bottom wall that closes the lower end of the reverse cylindrical wall;
The bottom wall of the central bottom wall, with which to position the pin Nchiofu portion in a central portion recessed into spheres arc, it can exhibit leg function,
It is in.

The bottle is a direct blow-molded product, and when the direct blow molding is performed, the entire decompression absorption bottom wall portion protrudes downward. Prior to heat-filling the contents from this state, the space forming functional portion of the reduced pressure absorption bottom wall portion is pushed into the bottle with the space forming tapered wall inverted. In this state, the contents are hot-filled, the bottle is sealed, and the sealed storage of the contents is completed. When the bottle is cooled in this state and a reduced pressure is generated in the bottle, the inverted cylindrical wall of the reduced pressure absorbing function portion is inverted and deformed according to the generated reduced pressure to absorb the reduced pressure in the bottle.

  The bottom wall of the bottle at the time of direct blow molding is formed by the central bottom wall of the reduced pressure absorbing function portion. The ridge leg wall of the space forming function part and the tapered wall of the space forming function, and the inverted cylindrical wall of the vacuum absorbing function part are cylindrical, so that they are sufficiently subjected to stretching deformation along the circumferential direction during direct blow molding. It is a part to be molded. Therefore, the protrusion leg wall, the space forming taper wall, and the reversing cylindrical wall are portions that can be easily formed to be sufficiently thin. Moreover, since the reverse cylinder wall has obtained the decompression capacity | capacitance by the reverse deformation | transformation, it is easy to enlarge the decompression capacity obtained.

  Since the obtained reduced pressure capacity is large, it is less necessary to withstand the reduced pressure generated by the body of the bottle, and the amount of synthetic resin for molding the bottle can be reduced accordingly.

  Another configuration of the present invention is such that a tapered cylindrical diameter-expanding cylindrical wall that is expanded downward is connected to the lower end of the support cylindrical wall piece of the space forming function portion in the main configuration described above. By connecting the inverted cylindrical wall of the decompression absorbing function part through the short cylindrical fulcrum cylindrical wall piece at the lower end of the tube, the combination of the space forming taper wall, the enlarged diameter cylindrical wall and the inverted cylindrical wall is a bellows cylindrical shape It is the thing which added to the thing comprised.

  For the space forming functional part with an enlarged diameter cylindrical wall, the diameter of the inverted cylindrical wall of the reduced pressure absorbing function part can be increased, and the reduced pressure absorbing function part can exhibit that much. Absorption capacity can be increased. Further, by adding an enlarged cylindrical wall, the combination of the space forming tapered wall, the enlarged cylindrical wall, and the reversing cylindrical wall can be formed into a bellows cylindrical shape, thereby reversing the space forming tapered wall and the reversing cylindrical wall. It can be made easier to perform.

  Another configuration of the present invention is such that, in the main configuration described above, the entire central bottom wall is positioned within the space formed by the space forming taper wall in a state where the space forming taper wall and the inverted cylindrical wall are inverted and deformed. It is what added it as the structure.

  When the space forming taper wall and the inverted cylindrical wall are inverted and deformed, the central bottom wall is located in the space formed by the space forming taper wall. When the reduced pressure generated in the container is absorbed, that is, when the bottle as a product is displayed and transported, the protruding leg wall surely forms the leg of the bottle.

  Further, another configuration of the present invention is obtained by adding the main body described above to a cylindrical body having a smooth outer surface in the body of the bottle.

  If the bottle body has a cylindrical shape with a smooth outer surface, the bottle has a vacuum absorption capacity while maintaining a simple and desirable appearance of the bottle, despite having a vacuum absorption part due to deformation. Can be granted.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, it is easy to form the space forming tapered wall and the reversing cylindrical wall sufficiently thin, and thereby the space forming tapered wall and the reversing cylindrical wall can be smoothly reversed and deformed. In addition, since the decompression capacity obtained by the inversion deformation of the inversion cylinder wall is large, a sufficiently large decompression absorption capacity can be obtained.

  In addition, since the reduced pressure capacity obtained is large, the amount of synthetic resin for molding the bottle can be reduced, thereby making it possible to save resources of the synthetic resin material for molding the bottle, reducing the weight of the entire bottle, Since the squeeze property of the trunk portion can be enhanced, the content squeezing operation becomes easy.

  In the space forming functional part with an enlarged diameter cylindrical wall, the reduced pressure absorbing function that can be exhibited by the reduced pressure absorbing function part can be increased, so that a sufficient reduced pressure absorbing capacity can be reliably obtained. In addition, the space forming tapered wall and the reversing cylindrical wall can be more easily reversed, so that smooth handling and reliable decompression absorption operation can be obtained.

  When the central bottom wall is positioned within the space formed by the space forming taper wall with the space forming taper wall and the inverted cylindrical wall being inverted and deformed, the product bottle is displayed and transported. During handling, the protruding leg wall reliably forms the leg of the bottle, so that the bottle can be stably and surely self-supporting.

  If the bottle body has a cylindrical shape with a smooth outer surface, the bottle has a vacuum absorption capacity while maintaining a simple and desirable appearance of the bottle, despite having a vacuum absorption part due to deformation. Therefore, it is possible to form a bottle with a reduced pressure absorption function using an existing molding tool.

It is the whole front view which fractured | ruptured partially and shows the example of 1st Embodiment of this invention. It is a whole front view at the time of the airtight storage state of the example of 1st Embodiment of FIG. It is a principal part expansion external view of the example of 1st Embodiment of FIG. It is a principal part expanded longitudinal cross-sectional view of the example of 1st Embodiment of FIG. 1 before heat filling. It is a principal part expanded longitudinal cross-sectional view at the time of vacuum absorption of the example of 1st Embodiment of FIG. It is the whole front view which fractured | ruptured partially and shows the example of 2nd Embodiment of this invention. It is a whole front view at the time of the airtight accommodation state of the 2nd Example of FIG. It is a principal part expanded external view of the 2nd Embodiment example of FIG. It is a principal part expanded longitudinal cross-sectional view of the example of 2nd Embodiment of FIG. 6 before heat filling. FIG. 7 is an enlarged longitudinal sectional view of a main part of the second embodiment shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The synthetic resin bottle 1 according to the present invention (refer to FIG. 1 and FIG. 6 below) is a heat-resistant direct blow molded product made of synthetic resin having high heat resistance such as PP for heat filling the contents, and has a smooth outer surface. A cylindrical barrel portion 2 having an inner plug 18 attached to an upper end of a cylindrical barrel portion 3 having a diameter reduced upward is provided on the upper end of the cylindrical barrel portion 3. The bottom part 4 is continuously provided at the lower end of the body part 3.

  The bottom portion 4 is provided with a reduced pressure absorption bottom wall portion 7 that exhibits a reduced pressure absorption action through a shallow circumferential groove 6 at a lower end of a bottom cylindrical wall 5 that is continuously connected to the body portion 3 and is gradually reduced in diameter downward. Configured. The decompression absorption bottom wall portion 7 includes a space forming function portion 8 and a decompression absorption function portion 13, and the space formation function portion 8 can accommodate the decompression absorption function portion 13 in the bottle 1. A space is formed, and the reduced pressure absorption function portion 13 absorbs the reduced pressure generated in the bottle 1 by its reverse deformation.

  The space forming functional portion 8 (see FIGS. 4 and 9) can be reversely deformed by reducing the diameter downward to the inner peripheral edge of the protruding leg wall 9 that forms a leg with a curved protruding wall structure. A space forming taper wall 10 is continuously provided, and a support cylinder wall piece 11 having a short cylindrical structure for continuously providing a reduced pressure absorbing function portion 13 is provided at the lower end of the space forming taper wall 10. While the leg wall 9 is curved and deformed in a direction to increase its degree of curvature and is formed into a “leg” of the projecting strip, the space forming taper wall 10 is depressed in the bottle 1 with the projecting leg wall 9 as a deformation fulcrum. The space which the decompression absorption function part 13 is located in the inside is formed.

  The space-reversal function part 8 is depressed and reversed in the bottle 1 before the heat filling of the contents in the bottle 1 is started, as soon as possible after release from the state of FIG. 3 or FIG. This is achieved by pushing the absorption bottom wall portion 7 into the bottle 1 and causing the space forming taper wall 10 to be inverted and deformed.

  The reduced pressure absorption function part 13 (see FIGS. 4 and 9) is a tapered cylindrical reversal cylinder having a diameter reduced downward at the lower end of a short cylindrical fulcrum cylinder wall piece 14 provided continuously with the lower end of the space forming function part 8. A wall 15 is provided in series, and a short cylindrical central bottom wall 16 is provided at the lower end of the inverted cylindrical wall 15 with the lower end closed by a bottom wall. The bottom wall of the central bottom wall 16 is depressed in a spherical arc shape. The pinch-off part at the time of direct blow molding is located in the center part.

  The hot filling of the contents into the bottle 1 is performed after the bottle 1 is molded and after the reduced pressure absorption bottom wall portion 7 is in the state shown in FIGS. 4 and 9, and the hot filling operation of the contents is completed. For example, the inner plug 18 is quickly mounted and the bottle 1 is sealed with the cap 17.

  After the bottle 1 is sealed with the cap 17, when the contents are cooled, the inside of the bottle 1 is in a reduced pressure state. When the inside of the bottle 1 is in a reduced pressure state, the inverted cylindrical wall 15 of the reduced pressure absorbing function portion 13 is inverted and deformed inward of the bottle 1 to absorb the reduced pressure in the bottle 1 (see FIGS. 5 and 10). The reverse deformation of the inverted cylindrical wall 15 is performed with the support cylindrical wall piece 11 and the fulcrum cylindrical wall piece 14 that are not deformed as a fulcrum, so that the reverse cylindrical wall 15 is in a good state without being affected by the reverse deformation of the space forming tapered wall 10. Achieved.

  In the reduced pressure absorption state in which the inverted cylindrical wall 15 is depressed and deformed, that is, in the product state of the bottle 1, the reduced pressure absorption function part 13 that is depressed and displaced in the bottle 1 is located in the space formed by the space forming function part 8. (See FIGS. 5 and 10), the leg 1 of the bottle 1 is formed by the protruding leg wall 9, thereby exhibiting a stable self-supporting function.

  Even if the cap 17 is opened from the state where the reduced pressure of the bottle 1 is absorbed (see FIG. 2 and FIG. 7) and the pressure difference between the inside and outside of the bottle 1 disappears, the reversing cylindrical wall 15 is reversely restored and deformed. And maintain a stable state. Therefore, in this state, the cap 17 is removed, the bottle 1 is turned upside down, and the body portion 3 is squeezed so that a desired amount of contents can be easily poured out from the small spout of the inner plug 18. it can.

FIGS. 1 to 5 show a first embodiment of the present invention, in which the space forming functional portion 8 is constituted by a ridge leg wall 9, a space forming taper wall 10, and a supporting cylinder wall piece 11. The entire structure of the reduced pressure absorption bottom wall 7 is simplified. In the first embodiment, the support cylinder wall piece 11 of the space forming function portion 8 also serves as the fulcrum cylinder wall piece 14 of the reduced pressure absorption function portion 13.

  6 to 10 show a second embodiment of the present invention. The space forming function portion 8 is configured by adding a diameter-enlarging cylindrical wall 12 to the space forming function portion 8 of the first embodiment. ing. As described above, the second embodiment has the enlarged diameter cylindrical wall 12 in which the space forming functional portion 8 is expanded downward, and the reduced pressure absorbing functional portion 13 is continuously provided at the lower end of the enlarged diameter cylindrical wall 12. Therefore, the reduced-pressure absorption function portion 13 is increased in diameter by the expanded diameter of the expanded cylindrical wall 12.

For this reason, in the second embodiment, the reduced-pressure absorption capability exhibited by the reduced-pressure absorption function portion 13 is increased by the expanded diameter. Further, by adding this enlarged diameter cylindrical wall 12, the entire structure of the decompression absorbing bottom wall portion 7 becomes a bellows cylindrical structure, whereby the space forming tapered wall 10 and the inverted cylindrical wall 15 are easily deformed in an inverted manner. . In addition, by adding the enlarged diameter cylindrical wall 12, the height width of the space forming functional portion 8 is increased, and thereby the space forming tapered wall 10 of the space forming functional portion 8 is pushed in and inverted and deformed (see FIG. 9 reference), the central bottom wall 16 of the vacuum absorption function portion 13, there is also located below the ridge leg wall 9, in such a case, the bottom wall of the central bottom wall 16 of the legs functions Since it exhibits, the self-supporting function of the bottle 1 up to the hot filling of the contents can be obtained without any inconvenience.

  The present invention is not limited to the above-described embodiment. For example, the body 3 may be formed into a beadal shape, and a hinge cap may be used as the cap 17.

As described above, the synthetic resin bottle of the present invention can obtain a sufficient reduced pressure absorption capability without deteriorating the appearance in the reduced pressure absorption function portion, and squeezes the heat-filled contents. dispensing bottle and to a wide range of use deployment that is expected.

DESCRIPTION OF SYMBOLS 1; Bottle 2; Mouth part 3; Body part 4; Bottom part 5; Bottom cylinder wall 6; Circumferential groove 7; Decompression absorption bottom wall part 8; Space formation functional part 9; Support cylinder wall piece 12; enlarged diameter cylinder wall 13; decompression absorbing functional portion 14; fulcrum cylinder wall piece 15; reversal cylinder wall 16; central bottom wall 17; cap 18;

Claims (4)

A heat-resistant synthetic resin bottle (1) for heat-filling the contents, wherein the bottom (4) has a reduced pressure absorption bottom wall portion (7) comprising a space forming functional portion (8) and a reduced pressure absorption functional portion (13). And the space forming function part (8) forming the space where the reduced pressure absorption function part (13) is located is formed into a protruding leg wall ( 9), a space forming taper wall (10) that is connected to the inner peripheral edge of the ridge leg wall (9) and that can be reduced in diameter by being lowered, and a lower end of the space forming taper wall (10). The support cylinder wall piece (11) having a short cylindrical shape is provided, and the reduced pressure absorption function portion (13) is continuously provided at the lower end of the support cylinder wall piece (11), and is reduced in diameter and inverted. A deformable reversing cylindrical wall (15) and a central bottom wall (16) for closing the lower end of the reversing cylindrical wall (15); The central bottom wall of the bottom wall (16), together with which to position the pin Nchiofu portion depressed the central portion of a sphere arcuate, synthetic resin bottle which is a structure capable of exhibiting the leg function. A tapered cylindrical diameter-expanding cylindrical wall (12) having a diameter expanded downward is connected to the lower end of the support cylindrical wall piece (11) of the space forming functional part (8), and the lower end of the diameter-expanded cylindrical wall (12). The space forming taper wall (10) and the enlarged diameter cylindrical wall are provided by connecting the inverted cylindrical wall (15) of the reduced pressure absorption function part (13) to the cylinder through the short cylindrical fulcrum cylindrical wall piece (14). The synthetic resin bottle according to claim 1, wherein the combination of (12) and the inverted cylinder wall (15) is formed in a bellows cylinder shape. The central bottom wall (16) is located in a space formed by the space forming taper wall (10) in a state where the space forming taper wall (10) and the inverted cylindrical wall (15) are deformed in an inverted depression. The synthetic resin bottle according to 1 or 2. The synthetic resin bottle according to any one of claims 1 to 3, wherein the body (3) of the bottle (1) has a cylindrical shape with a smooth outer surface.

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