Liquid blow molding method

Patent metadata

Field	Value
Publication number	US-11014281-B2
Application number	US-201716094667-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Apr 28, 2016
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A liquid blow molding method molds a bottomed tubular-shaped preform into a liquid containing container. The method includes a nozzle engaging step of engaging a blow nozzle with a mouth of the preform; a molding step of molding the preform into a container of a predetermined shape by supplying a pressurized liquid from a pump into the preform; a suck-back step of sucking back a predetermined volume of liquid out of the container into a supply path; a nozzle closing step of closing the blow nozzle by a sealing body; and a discharge step of discharging a liquid in the supply path by a predetermined volume from a discharge port by operating, after the nozzle closing step, a pump in a positive direction with the discharge port connected to the supply path opened.

First claim

The invention claimed is:

1. A liquid blow molding method for molding a bottomed tubular-shaped preform into a liquid-containing container in which a content liquid is held, the method comprising:
a nozzle engaging step of engaging a blow nozzle with a mouth of the preform, the blow nozzle being connected to a pump through a supply path;
a molding step of supplying a pressurized liquid from the pump through the supply path and through the blow nozzle into the preform to mold the preform into a container of a predetermined shape;
a suck-back step of suctioning a predetermined volume of liquid out from an interior of the container, which was molded into the predetermined shape in the molding step, and into the supply path by operating the pump in a reverse direction;
a nozzle closing step of closing the blow nozzle by a sealing body with the container molded into the predetermined shape; and
a discharge step of discharging the liquid suctioned back into the supply path by the predetermined volume from a discharge port out of the supply path by operating, after the nozzle closing step, the pump in a positive direction with the discharge port connected to the supply path opened.

2. The liquid blow molding method according to claim 1 , wherein in the molding step, the preform is stretched in an axial direction by a stretching rod; and
after the nozzle closing step, the liquid blow molding method further comprises a withdrawing step of withdrawing the stretching rod from the container molded into the predetermined shape in the molding step.

3. The liquid blow molding method according to claim 1 , wherein a liquid discharged from the discharge port out of the supply path in the discharge step is collected in a supply tank configured to supply a liquid to the pump through a collection path.

4. The liquid blow molding method according to claim 1 , wherein a liquid of the same predetermined volume as the liquid suctioned back into the supply path in the suck-back step is discharged from the discharge port out of the supply path in the discharge step.

5. The liquid blow molding method according to claim 2 , wherein a liquid discharged from the discharge port out of the supply path in the discharge step is collected in a supply tank configured to supply a liquid to the pump through a collection path.

6. The liquid blow molding method according to claim 2 , wherein a liquid of the same predetermined volume as the liquid suctioned back into the supply path in the suck-back step is discharged from the discharge port out of the supply path in the discharge step.

7. The liquid blow molding method according to claim 3 , wherein a liquid of the same predetermined volume as the liquid suctioned back into the supply path in the suck-back step is discharged from the discharge port out of the supply path in the discharge step.

8. The liquid blow molding method according to claim 5 , wherein a liquid of the same predetermined volume as the liquid suctioned back into the supply path in the suck-back step is discharged from the discharge port out of the supply path in the discharge step.

Assignees

• Suzuki Masato
• Shiokawa Mitsuru
• Yoshino Kogyosho Co Ltd

Inventors

• Suzuki Masato
• Shiokawa Mitsuru

Classifications

• B29C49/12

  Stretching rods · CPC title

• B29C49/46 Primary

  characterised by using particular environment or blow fluids other than air · CPC title

• B29C49/42403

  Purging or cleaning the blow-moulding apparatus · CPC title

• B29C49/42122

  Adapting to blow-mould cavity center-center distance · CPC title

• B65D1/00

  Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material (with curved or partially-curved cross-section made by winding or bending paper B65D3/00; with polygonal cross-section formed by folding B65D5/00; specially constructed to be opened by cutting, piercing or tearing of wall portions B65D17/00; rigid pallets with side walls B65D19/02) · CPC title