Die for injection molding, production apparatus for container made of resin, and plug unit

Patent metadata

Field	Value
Publication number	US-11951664-B2
Application number	US-202017442877-A
Country	US
Kind code	B2
Filing date	Mar 24, 2020
Priority date	Mar 26, 2019
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

An injection molding mold including: a flow path through which a molten resin passes; a main body portion including an introduction portion configured to introduce the molten resin into the flow path and a supply portion configured to supply the molten resin from the flow path to a cavity mold; and a plug unit formed with a plug flow path which is a part of the flow path, the plug unit being attachable to the main body portion, in which a prevention portion configured to prevent a pressure loss from occurring when the molten resin passes through the flow path is formed at a portion of the plug flow path where a moving direction of the molten resin changes.

First claim

The invention claimed is:

1. An injection molding mold comprising:
a flow path through which a molten resin passes;
a main body portion including an introduction portion configured to introduce the molten resin into the flow path and a supply portion configured to supply the molten resin from the flow path to a cavity mold; and
a plug unit formed with a plug flow path which is a part of the flow path, the plug unit being attachable to the main body portion,
wherein a prevention portion configured to prevent a pressure loss from occurring when the molten resin passes through the flow path is formed at a portion of the plug flow path where a moving direction of the molten resin changes,
wherein the plug unit includes a plurality of base members,
wherein the plurality of base members includes:
a first base member formed with a straight portion of the flow path where the molten resin moves straight;
a second base member formed with a curved portion of the flow path where the moving direction of the molten resin changes; and
a third base member formed with a branched portion of the flow path where the moving direction of the molten resin branches, and

wherein the first base member is disposed between the second base member and the third base member.

2. The injection molding mold according to claim 1 ,
wherein the plug flow path includes a curved portion where the moving direction of the molten resin changes, and
wherein the prevention portion is formed as a curved surface on an inner part of an inner peripheral surface of the curved portion.

3. The injection molding mold according to claim 2 ,
wherein the prevention portion is further formed as a curved surface on an outer part of the inner peripheral surface of the curved portion.

4. The injection molding mold according to claim 1 ,
wherein the plug flow path includes a branched portion that branches at least in two different directions,
wherein the branched portion includes a first flow path and a second flow path, and
wherein the prevention portion is formed as a curved surface on an inner part of an inner peripheral surface of the first flow path and formed as a curved surface on an inner part of an inner peripheral surface of the second flow path.

5. The injection molding mold according to claim 4 ,
wherein the prevention portion is further formed as a curved surface on an outer part of the inner peripheral surface of the first flow path and formed as a curved surface on an outer part of the inner peripheral surface of the second flow path, and
wherein a boundary portion between the outer part of the inner peripheral surface of the first flow path and the outer part of the inner peripheral surface of the second flow path is formed in a pointed shape.

6. A resin container manufacturing apparatus comprising the injection molding mold according to claim 1 .

7. A plug unit attachable to a main body portion of an injection molding mold in which a flow path through which a molten resin passes is formed, the plug unit comprising:
a plug main body portion formed with a plug flow path which is a part of the flow path,
wherein a prevention portion configured to prevent a pressure loss from occurring when the molten resin passes through a part of the plug flow path is formed at a portion of the plug flow path where a moving direction of the molten resin changes,
wherein the plug unit includes a plurality of base members,
wherein the plurality of base members includes:
a first base member formed with a straight portion of the flow path where the molten resin moves straight;
a second base member formed with a curved portion of the flow path where the moving direction of the molten resin changes; and
a third base member formed with a branched portion of the flow path where the moving direction of the molten resin branches, and
wherein the first base member is disposed between the second base member and the third base member.

Assignees

• Nissei Asb Machine Co Ltd

Inventors

• Takehana Daizaburo

Classifications

• B29C45/30 Primary

  Flow control means disposed within the sprue channel, e.g. "torpedo" construction · CPC title

• B29C49/06

  Injection blow-moulding · CPC title

• B29C2045/2683

  Plurality of independent mould cavities in a single mould · CPC title

• B29C45/2725 Primary

  Manifolds · CPC title

• B29C2045/2733

  Inserts, plugs, bushings · CPC title