Cooling mold, and apparatus and method for manufacturing resin molded article

Patent metadata

Field	Value
Publication number	US-12397486-B2
Application number	US-202017602218-A
Country	US
Kind code	B2
Filing date	Apr 8, 2020
Priority date	Apr 8, 2019
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

A cooling mold for cooling a resin preform that has a gate portion protruding outward from a center of a bottom portion, in which an accommodating space that accommodates the preform is formed in the cooling mold, a bottom region facing the bottom portion of the preform in the accommodating space has a shape following the bottom portion of the preform, and an air sucking hole for sucking air is formed in the bottom region at a position shifted from the center of the bottom portion of the preform. In the accommodating space, a region facing a body portion of the perform and a bottom region facing the bottom portion of the perform are formed as a single member.

First claim

The invention claimed is:

1. A mold for cooling a resin preform that has a gate portion protruding outward from a center of a bottom portion, wherein
an accommodating space that accommodates the preform is formed in the mold,
a bottom region facing the bottom portion of the preform in the accommodating space has an internal shape following an outer shape of the bottom portion of the preform, and
a plurality of air sucking holes that sucks air is formed in the bottom region at a position shifted from the center of the bottom portion of the preform,
such that there is no air sucking hole at a position facing the gate portion of the preform in the mold, and an internal surface of the bottom region following the outer shape of the bottom portion of the preform faces the gate portion,
such that the mold is adapted for:
sucking air from the air sucking holes of the mold and drawing the preform into the accommodating space; and
collapsing the gate portion in the bottom region to remove the gate portion.

2. The mold according to claim 1 , wherein,
wherein the accommodating space comprises a region facing the body portion of the preform and the bottom region facing the bottom portion of the preform, wherein the region and the bottom region of the accommodating space are formed as single member.

3. The mold according to claim 1 , wherein
the plurality of the air sucking holes is formed in the bottom region so as to be rotationally symmetric with respect to the center of the bottom portion of the preform.

4. An apparatus for manufacturing a resin molded article, comprising:
an injection molding unit configured to injection-mold a resin preform having a gate portion protruding outward from a center of a bottom portion; and
a mold according to claim 1 , the mold is configured for accommodating and cooling the injection-molded resin preform in the accommodating space, wherein the mold is configured for sucking air from the air sucking holes to draw the preform into the accommodating space and collapsing the gate portion in the bottom region to remove the gate portion.

5. The apparatus for manufacturing the resin molded article according to claim 4 , wherein the mold is disposed in at least either a receiving unit configured to carry out the preform from the injection molding unit or a cooling unit configured to cool the preform carried out from the injection molding unit.

6. The apparatus for manufacturing the resin molded article according to claim 5 , further comprising:
a heating unit configured to continuously convey and heat the preform cooled in the cooling unit; and
a blow molding unit configured to blow-mold the preform after heating to manufacture a resin container.

7. The apparatus for manufacturing the resin molded article according to claim 6 , wherein
a cycle of the blow molding in the blow molding unit is shorter than a cycle of injection molding of the preform in the injection molding unit, and
a plurality of the preforms molded in one cycle of the injection molding unit is blow-molded in a plurality of the blow molding cycles.

8. A method for manufacturing a resin molded article using a mold according to claim 1 , the method comprising:
accommodating and cooling a resin preform having a gate portion protruding outward from a center of a bottom portion in the accommodating space of the mold;
sucking air from the air sucking holes of the mold;
drawing the preform into the accommodating space; and
collapsing the gate portion in the bottom region to remove the gate portion.

Assignees

• Nissei Asb Machine Co Ltd

Inventors

• Takehana Daisaburo
• Maruyama Yasuhide

Classifications

• B29C49/42077

  with U-shaped holder · CPC title

• B29C49/42065

  Means specially adapted for transporting preforms · CPC title

• B29C49/42101

  Conveyors, e.g. flat conveyor or clamping between two bands · CPC title

• B29C2045/7214

  Preform carriers for cooling preforms · CPC title

• B29C49/42091

  holding bottom portion or sprue · CPC title