US4241008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacture of hollow bodies
Assignee: Carnaud Total Interplastic SA
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Filing: 1978-05-02
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Granted: 1980-12-23
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Expires: 1998-05-02
Abstract
Abstract Process for making transparent hollow bodies of terephthalate of polyethyleneglycol in which a preform is made, the preform is cooled rapidly to a temperature at least equal to the crystallization temperature, and is then rapidly expanded to obtain bi-orientation and solidification prior to substantial crystallization of the material. The preform can also be axially stretched during the operation. The apparatus for preforming the process includes a rotatable turret with mandrels, which operates to slightly expand the material on a mandrel.
Inventors
- 👤 Guy Flamand
- 👤 Jean-Francois Gregoire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:37
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/6409; B29C49/6427; B29C49/02; B29C49/06; B29C49/08; B29C49/18; B29C2049/023; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A process for making hollow transparent bodies of polyethyleneglycol terephthalate, comprising the steps of: (a) forming a blank in the form of a parison or preform by injecting polyethyleneglycol terephthalate around a cooled mandrel in a first mold; (b) rapidly cooling the blank to a temperature less than or equal to the crystallization temperature of the material and above its vitreous transition temperature; (c) separating the blank from the first mold; (d) subjecting said blank while free of the confines of a mold and while supported only by said mandrel to a small radial and/or axial expansion to cause a slight separation of the blank with regard to the mandrel; (e) expelling said slightly expanded blank from the mandrel and into a channel which conducts the blank directly into a second mold; and (f) rapidly expanding said blank in said second mold to expand said blank axially and/or radially to an extent sufficient to obtain bi-orientation and hardening before substantial crystallization of the material occurs.
Claim 2
Dependent Claim
165 words
A process for making hollow transparent bodies of polyethyleneglycol terephthalate, comprising the steps of: (a) forming a blank in the form of a parison or preform by injecting polyethyleneglycol terephthalate around a cooled mandrel in a first mold; (b) rapidly cooling the blank to a temperature less than or equal to the crystallization temperature of the material and above its vitreous transition temperature; (c) separating the blank from the first mold; (d) subjecting said blank while free of the confines of a mold and while supported only by said mandrel to a small radial and/or axial expansion to cause a slight separation of the blank with regard to the mandrel; (e) expelling said slightly expanded blank from the mandrel and into a channel which conducts the blank directly into a second mold; and (f) rapidly expanding said blank in said second mold to expand said blank axially and/or radially to an extent sufficient to obtain bi-orientation and hardening before substantial crystallization of the material occurs.
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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |