Hollow container manufacturing method and manufacturing apparatus

• US 10,173,360 B2
• Filed: 06/17/2015
• Issued: 01/08/2019
• Est. Priority Date: 06/20/2014
• Status: Active Grant

• Current Assignee: Nissei ASB Machine Company Limited
• Original Assignee: Nissei ASB Machine Company Limited
• Inventors: Miyazawa, Yoshiki, Tsuchiya, Yoichi
• Primary Examiner(s): Davis, Robert B
• Application Number:
  US15/320,142
• Publication Number:
  US 20170129158A1
• Time in Patent Office: 1,301 Days
• Field of Search: 264530, 425530
• CPC Class Codes: B29B 11/08 Injection moulding
• CPC Class Codes: B29B 11/12 Compression moulding
• CPC Class Codes: B29B 11/14 characterised by structure or composition
• CPC Class Codes: B29C 2049/023 using inherent heat of the preform, i.e. 1 step blow moulding
• CPC Class Codes: B29C 2791/001 Shaping in several steps
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 2949/0779 characterised by the body
• CPC Class Codes: B29C 2949/078 characterised by the bottom
• CPC Class Codes: B29C 2949/0817 of the body
• CPC Class Codes: B29C 2949/0818 of the bottom
• CPC Class Codes: B29C 2949/3056 having components being compression moulded
• CPC Class Codes: B29C 49/02 Combined blow-moulding and manufacture of the preform or the parison
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/061 with parison holding means displaceable between injection and blow stations
• CPC Class Codes: B29C 49/071 Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
• CPC Class Codes: B29C 49/18 using several blowing steps B29C49/16 takes precedence
• CPC Class Codes: B29C 49/28 Blow-moulding apparatus
• CPC Class Codes: B29C 49/42421 before laying into the mould
• CPC Class Codes: B29C 49/4252 Auxiliary operations prior to the blow-moulding operation not otherwise provided for
• CPC Class Codes: B29K 2067/003 PET, i.e. poylethylene terephthalate
• CPC Class Codes: B29L 2031/712 : Containers; Packaging elements or accessories, Packages closures therefor B29L2031/56; ink or toner cartridges B29L2031/7678; squeeze tubes B29L2023/20; suitcases B29L2031/7418

Abstract

A hollow container manufacturing method comprises: an injection molding step of forming a preform having a neck portion and a barrel portion, at least a part of the barrel portion being solid, by injection molding; an intermediate product formation step of inserting a boring rod 134 from the neck portion side into the barrel portion 23 to form a space part of at least a predetermined depth in the barrel portion, thereby converting the preform into an intermediate molded product; and a final blow molding step of blow-molding the intermediate molded product within a final blow mold to form a hollow container which is a final molded product.

Claims

1. A hollow container manufacturing method, comprising:

an injection molding step of forming a preform having a neck portion and a barrel portion, at least a part of the barrel portion being solid, by injection molding;

an intermediate product formation step of inserting a boring rod from a side of the neck portion into the barrel portion to form a space part of at least a predetermined depth in the barrel portion, thereby converting the preform into an intermediate molded product; and

a final blow molding step of blow molding the intermediate molded product to form a hollow container which is a final molded product.

2. The hollow container manufacturing method according to claim 1, wherein

during the injection molding step, a reference hole of a predetermined depth is formed in the neck portion, and

during the intermediate product formation step, the boring rod is inserted from the reference hole into the barrel portion to form the space part.

3. The hollow container manufacturing method according to claim 2, wherein

during the injection molding step, the reference hole is formed to a depth reaching the barrel portion.

4. The hollow container manufacturing method according to claim 1, wherein

during the intermediate product formation step, the space part is formed with the predetermined depth by inserting the boring rod into the barrel portion while jetting air from at least a leading end of the boring rod.

5. The hollow container manufacturing method according to claim 4, wherein

during the intermediate product formation step, the space part is formed in the barrel portion, and blow molding is performed so that a barrel portion of the intermediate molded product has a predetermined diameter.

6. The hollow container manufacturing method according to claim 4, wherein

the intermediate product formation step and the final blow molding step are uninterruptedly executed to blow-mold the intermediate molded product by air jetted from the boring rod, thereby forming the hollow container.

7. A hollow container manufacturing apparatus, comprising:

an injection molding section for forming a preform, which has a neck portion and a barrel portion, and in which at least a part of the barrel portion is solid, by injection molding;

an intermediate molding section for inserting a boring rod from a side of the neck portion into the barrel portion to form a space part of at least a predetermined depth in the barrel portion, thereby converting the preform into an intermediate molded product; and

a final blow molding section for blow molding the intermediate molded product to form a hollow container which is a final molded product.

8. The hollow container manufacturing apparatus according to claim 7, wherein

the boring rod is configured to be capable of jetting air from at least a leading end thereof into the barrel portion of the preform.

9. The hollow container manufacturing apparatus according to claim 8, wherein

the boring rod has at the leading end thereof a ring-shaped opening portion for jetting air.

10. The hollow container manufacturing apparatus according to claim 7, wherein

the intermediate molding section is equipped with the boring rod and an intermediate blow mold where the preform is accommodated, and

with the preform being accommodated within the intermediate blow mold, the boring rod is inserted into the barrel portion to form the space part, and blow molding is performed so that the barrel portion has a predetermined diameter.

11. The hollow container manufacturing apparatus according to claim 7, wherein

the final blow molding section concurrently serves as the intermediate molding section,

the final blow molding section is equipped with the boring rod and a final blow mold, and

in the final blow molding section, with the preform being accommodated within the final blow mold, the boring rod is inserted into the barrel portion to form the space part, thereby converting the preform into the intermediate molded product, and the intermediate molded product is uninterruptedly blow-molded to form the hollow container.