US4091059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for blow molding and cooling plastic articles
Assignee: Individual
•
Filing: 1976-09-23
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Granted: 1978-05-23
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Expires: 1996-09-23
Abstract
Abstract A technique for internally cooling a blow molded article with a coolant comprising a mixture of subzero temperature dry air and water. A pressure swing dessicant bed type dryer and chiller are used to supply the dry air having a dew point of the order of -60° F and a temperature ranging from -30° to -50° F for introduction into the blow molded article.
Inventors
- 👤 Leonard Benoit Ryder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:04
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/66; B29C35/00; B29C35/16; B29C2035/1658; B29C2035/1666
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A process for the preparation of a blow molded article which comprises the steps of shaping a thermoplastic polymer material in a mold cavity with a pressurized gaseous blowing medium to form a hollow shaped article and cooling the article, the improvement which comprises effecting said cooling by (a) introducing air having a temperature ranging from 75°-105° F and maintained at a pressure ranging from 80-400 psig at a dew point of about 75° F to a pressure swing dessicant bed type dryer, so resulting in drying of said air to a dew point of the order of -60° F, (b) passing the resultant dried air to a chiller wherein it is cooled to a temperature ranging from -30° to -50 ° F, and (c) introducing said chilled air into and continually flushing it through the blow molded article.
Claim 2
Dependent Claim
139 words
A process for the preparation of a blow molded article which comprises the steps of shaping a thermoplastic polymer material in a mold cavity with a pressurized gaseous blowing medium to form a hollow shaped article and cooling the article, the improvement which comprises effecting said cooling by (a) introducing air having a temperature ranging from 75°-105° F and maintained at a pressure ranging from 80-400 psig at a dew point of about 75° F to a pressure swing dessicant bed type dryer, so resulting in drying of said air to a dew point of the order of -60° F, (b) passing the resultant dried air to a chiller wherein it is cooled to a temperature ranging from -30° to -50 ° F, and (c) introducing said chilled air into and continually flushing it through the blow molded article.
Claim 3
Dependent Claim
21 words
Process in accordance with claim 1 wherein said chilled air is continuously mixed with water to form a cold air-water mist.
Claim 4
Dependent Claim
22 words
Process in accordance with claim 2 wherein the chilled air precedes the introduction of water into the system, thereby avoiding premature cooling.
Claim 5
Dependent Claim
35 words
Process in accordance with claim 3 wherein the water supply is terminated a fraction of a second prior to termination of the cooling cycle so avoiding the presence of residual moisture in the blown article.
Claim 6
Dependent Claim
20 words
Process in accordance with claim 2 wherein the water is mixed with chilled air prior to entering the blown article.
Claim 7
Dependent Claim
22 words
Process in accordance with claim 2 wherein the water is mixed with chilled air subsequent to the air entering the blown article.
Claim 8
Dependent Claim
35 words
Process in accordance with claim 2 wherein the water supply is terminated a fraction of a second prior to termination of the cooling cycle, so avoiding the presence of residual moisture in the blown article.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |