US4039641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics container manufacture
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-11-28
•
Granted: 1977-08-02
•
Expires: 1995-11-28
Abstract
Abstract An oriented plastics container, e.g. bottle, is heat set by holding an unheat set container against the heated walls of a split mould by means of gas under pressure, and thereafter cooling the container, e.g. by cooling the mould or by displacing said gas with a cooling liquid under pressure, and then removing the container from the mould. The liquid may be that to be packaged in the container.
Inventors
- 👤 Thomas Robert Stephen Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:04
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0005; B29C49/08; B29C49/10; B29C49/12; B29C49/42; B29C49/46; B29C49/64; B29C49/6472; B29C49/66; B29C71/00; B29C71/02; B65; B65B; B65B3/00; B65B3/02; B65B3/022; B29C35/00; B29C35/16; B29C2035/1616; B29C2049/4602; B29C2049/4605; B29C2049/4608; B29C2049/4626; B29C49/78; B29C49/783; B29C2049/7831; B29C49/786; B29C2049/7864; B29C2049/78645; B29C2049/7879; B29C2949/00; B29C2949/07; B29C2949/0715; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28; B29C2949/30; B29C2949/3024; B29C2949/3032; B29C49/02; B29C49/06; B29C49/087; B29C49/122; B29C49/1222; B29C49/4273; B29C49/428; B29C49/42802; B29C49/42808; B29K; B29K2995/00; B29K2995/0012; B29K2995/0017; Y; Y10; Y10S; Y10S264/00; Y10S264/90; Y10S264/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A process for the production of a heat set biaxially oriented polyethylene terephthalate bottle filled with a liquid comprising i. providing a polyethylene terephthalate parison having one closed end, preheated to a temperature at which it can be oriented, supported on a mandrel, ii. gripping the parison at its open end in a split mould the walls of which are heated to a temperature in the range 130° to 220° C., iii. stretching the parison axially by means of a plunger located in the mandrel and expanding the parison radially to contact the mould walls by means of a gas under pressure whereby the parison is transformed into a biaxially oriented bottle conforming to the mould configuration, iv. maintaining the bottle in contact with the walls of the mould by means of said gas under pressure while said polyethylene terephthalate crystallises, v. cooling the crystallised bottle by displacing the pressurising gas, while maintaining the pressure, with a cooling liquid, vi. removing the bottle containing the liquid from the mould.
Claim 2
Dependent Claim
169 words
A process for the production of a heat set biaxially oriented polyethylene terephthalate bottle filled with a liquid comprising i. providing a polyethylene terephthalate parison having one closed end, preheated to a temperature at which it can be oriented, supported on a mandrel, ii. gripping the parison at its open end in a split mould the walls of which are heated to a temperature in the range 130° to 220° C., iii. stretching the parison axially by means of a plunger located in the mandrel and expanding the parison radially to contact the mould walls by means of a gas under pressure whereby the parison is transformed into a biaxially oriented bottle conforming to the mould configuration, iv. maintaining the bottle in contact with the walls of the mould by means of said gas under pressure while said polyethylene terephthalate crystallises, v. cooling the crystallised bottle by displacing the pressurising gas, while maintaining the pressure, with a cooling liquid, vi. removing the bottle containing the liquid from the mould.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 in which the cooling liquid is the liquid to be packaged in the container.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1 in which the cooling liquid is chilled to 0° to 5° C. prior to displacing the gas from the container.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 1 in which the mould is maintained at 135° to 210° C.
References Cited (Backward Citations)
US3496143A
Cited
US3792144A
Cited
US3849530A
Cited
US3822332A
Cited
US3803275A
Cited
US3821349A
Cited
US3910746A
Cited
US3966378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |