Blow molding device, blow molding method, and mold unit

Patent metadata

Field	Value
Publication number	US-11565456-B2
Application number	US-201917417481-A
Country	US
Kind code	B2
Filing date	Dec 26, 2019
Priority date	Dec 28, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

An object of the present invention is to provide a blow molding device, a blow molding method, a mold unit, and a jig capable of shortening a molding cycle time. There is provided a blow molding device ( 100 ), in which the blow molding device ( 100 ) includes an injection molding part ( 10 ) injection-molding a preform ( 1 ) having a neck portion ( 3 ) on an open side and a main body portion ( 2 ) on a closed side, a temperature adjustment part ( 20, 520 ) adjusting a temperature of the preform ( 1 ) molded by the injection molding part ( 10 ), and a blow molding part ( 30 ) blow-molding the preform ( 1 ) whose temperature has been adjusted by the temperature adjustment part ( 20, 520 ), and the temperature adjustment part ( 20, 520 ) include a conditioning core mold ( 21, 321, 421, 521 ) that is in contact with substantially an entire inner surface of the main body portion ( 2 ) and a conditioning cavity mold ( 22, 322, 422, 522 ) that is in contact with substantially an entire outer surface of the main body portion ( 2 ), and compress and deform the main body portion ( 2 ) of the preform ( 1 ) into a desired shape with the main body portion ( 2 ) sandwiched between the conditioning core mold ( 21, 321, 421, 521 ) and the conditioning cavity mold ( 22, 322, 422, 522 ).

First claim

The invention claimed is:

1. A blow molding device, comprising: an injection molding part injection-molding a preform having a neck portion on an open side and a main body portion on a closed side; a temperature adjustment part adjusting a temperature of the preform molded by the injection molding part; and a blow molding part blow-molding the preform whose temperature has been adjusted by the temperature adjustment part,
wherein the temperature adjustment part include a conditioning core mold that is in contact with substantially an entire inner surface of the main body portion and a conditioning cavity mold that is in contact with substantially an entire outer surface of the main body portion, and compress and deform the main body portion of the preform into a desired shape with the main body portion sandwiched between the conditioning core mold and the conditioning cavity mold.

2. The blow molding device according to claim 1 , wherein the compression deformation of the preform into the desired shape deforms the preform from a shape that is easy to remove from the injection molding part to a shape that is easy to blow mold.

3. The blow molding device according to claim 1 , wherein the conditioning core mold and the conditioning cavity mold are cooled to a temperature below a predetermined temperature at which the preform is not crystallized.

4. The blow molding device according to claim 1 , wherein the conditioning core mold have transverse cross section equal to or larger than that of an injection core mold of the injection molding part.

5. A blow molding device, comprising: an injection molding part injection-molding a preform having a neck portion on an open side and a main body portion on a closed side; a temperature adjustment part adjusting a temperature of the preform molded by the injection molding part; and a blow molding part blow-molding the main body portion of the preform whose temperature has been adjusted by the temperature adjustment part,
wherein the temperature adjustment part includes a conditioning core mold that is in contact with an inner surface of the main body portion of the preform, and a conditioning cavity mold that is in contact with an outer surface of the main body portion, and
wherein at least one of the conditioning core mold and the conditioning cavity mold is provided so that axial centers of each other are moved and adjusted eccentrically.

6. The blow molding device according to claim 5 , further comprising: a neck mold holding the neck portion of the preform, wherein a centering ring for centering the conditioning core mold and the conditioning cavity mold are mounted between the neck mold and the conditioning cavity mold, and the movement adjustment of the conditioning core mold and the conditioning cavity mold is performed by moving and adjusting the centering ring.

7. The blow molding device according to claim 6 , wherein the movement adjustment of the centering ring is performed by sandwiching a shim between the centering ring and the attached conditioning core mold or conditioning cavity mold.

8. The blow molding device according to claim 6 , wherein the conditioning core mold and the conditioning cavity mold are eccentrically moved and adjusted with respect to each other by inserting and rotating a jig into the centering ring and the conditioning cavity mold, the jig having a large diameter portion having an outer diameter that is fitted into an inner circumference of the centering ring and a small diameter portion that has an outer diameter fitted into an inner circumference of the conditioning cavity mold and has an axial center eccentric with respect to an axial center of the large diameter portion.

9. A mold unit adjusting a temperature of a preform having a neck portion on an open side and a main body portion on a closed side, which is molded by an injection molding part, the mold unit comprising:
a conditioning core mold that is in contact with an inner surface of the main body portion of the preform, and a conditioning cavity mold that is in contact with an outer surface of the main body portion,
wherein one of the conditioning core mold and the conditioning cavity mold is provided so as to be eccentrically movable with respect to the other thereof.

10. The mold unit according to claim 9 , wherein a centering ring for centering the conditioning core mold and the conditioning cavity mold are mounted between a neck mold holding the neck portion and the conditioning cavity mold, and the movement adjustment of the conditioning core mold and the conditioning cavity mold is performed by moving and adjusting the centering ring.

11. The mold unit according to claim 10 , wherein the movement adjustment of the centering ring is performed by sandwiching a shim between the centering ring and the attached conditioning core mold or conditioning cavity mold.

12. The mold unit according to claim 10 , wherein the conditioning core mold and the conditioning cavity mold are eccentrically moved and adjusted with respect to each other by inserting and rotating a jig into the centering ring and the conditioning cavity mold, the jig having a large diameter portion having an outer diameter that is fitted into an inner circumference of the centering ring and a small diameter portion that has an outer diameter fitted into an inner circumference of the conditioning cavity mold and is eccentric with respect to an axial center of the large diameter portion.

Assignees

• Nissei Asb Machine Co Ltd

Inventors

• Oike Toshiteru
• Takehana Daizaburo

Classifications

• B29C49/36

  rotatable about one axis · CPC title

• B29C49/48 Primary

  Moulds · CPC title

• B29C49/64

  Heating or cooling preforms, parisons or blown articles · CPC title

• B29K2067/003

  PET, i.e. poylethylene terephthalate · CPC title

• B29C49/06

  Injection blow-moulding · CPC title