US3872203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing biaxially stretched receptacles by blow molding
Assignee: Kureha Corp
•
Filing: 1973-06-07
•
Granted: 1975-03-18
•
Expires: 1993-06-07
Abstract
Abstract A blow molding method for forming receptacles. A tubular parison is heated in a furnace, transferred to a delivery rotary, rotated to a position adjacent a stretching rotary, transferred to the stretching rotary, and longitudinally stretched while being rotated on such stretching rotary. The stretched parison is then transferred to a molding rotary and blow molded while being rotated thereon. Flash is retained by and then dropped from the stretching means and the molded article is dropped from the molding rotary.
Inventors
- 👤 Shinsuke Yoshikawa
- 👤 Yuji Sawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:24
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/08; B29C49/10; B29C49/14; B29C49/28; B29C49/30; B29C49/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
245 words
A method for blow molding a parison to form receptacles, comprising the steps of: a. heating a tubular parison cut to a predetermined length in a heating furnace while supporting said tubular parison on a supporting rod, b. transferring said tubular parison from said heating furnace to a delivery rotary, c. gripping a central portion of said tubUlar parison by movable jaws disposed on said delivery rotary, and maintaining said parison in a vertical position, d. rotating said delivery rotary about a vertical axis to bring said tubular parison adjacent a stretching rotary; e. transferring said tubular parison to said stretching rotary, f. gripping each end of said tubular parison by stretching means disposed on said stretching rotary, g. stretching said parison vertically by the stretching means at each end of said parison moving at equal speeds away from each other while rotating said stretching rotary continuously about a vertical axis to bring said parison adjacent a molding rotary having a plurality of openable molds adjacent its periphery, h. placing a mold about a central portion of said parison, i. separating the portion of said parison gripped by said stretching means from the portion retained by said mold, j. releasing said separated portions from said stretching means at a predetermined position of said stretching rotary, k. blow molding said parison while rotating said molding rotary about a vertical axis, l. separating said molded article from said mold at a predetermined position of said molding rotary.
Claim 2
Independent Claim
245 words
A method for blow molding a parison to form receptacles, comprising the steps of: a. heating a tubular parison cut to a predetermined length in a heating furnace while supporting said tubular parison on a supporting rod, b. transferring said tubular parison from said heating furnace to a delivery rotary, c. gripping a central portion of said tubUlar parison by movable jaws disposed on said delivery rotary, and maintaining said parison in a vertical position, d. rotating said delivery rotary about a vertical axis to bring said tubular parison adjacent a stretching rotary; e. transferring said tubular parison to said stretching rotary, f. gripping each end of said tubular parison by stretching means disposed on said stretching rotary, g. stretching said parison vertically by the stretching means at each end of said parison moving at equal speeds away from each other while rotating said stretching rotary continuously about a vertical axis to bring said parison adjacent a molding rotary having a plurality of openable molds adjacent its periphery, h. placing a mold about a central portion of said parison, i. separating the portion of said parison gripped by said stretching means from the portion retained by said mold, j. releasing said separated portions from said stretching means at a predetermined position of said stretching rotary, k. blow molding said parison while rotating said molding rotary about a vertical axis, l. separating said molded article from said mold at a predetermined position of said molding rotary.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |