US4112795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for perforating plastics tubes
Assignee: Wavin BV
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Filing: 1977-12-09
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Granted: 1978-09-12
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Expires: 1997-12-09
Abstract
Abstract A process for perforating plastic tubes, in particular thin-walled corrugated tubes, by a punching or cutting operation wherein the plastic tubes are subjected to a direct or indirect treatment by a cooling fluid prior to the punching and cutting operation. The process is performed by an apparatus comprising a guide structure and conveying device for conveying the plastic tubes, and further comprising punching or cutting members, while spraying devices are provided for effecting the above-mentioned cooling treatment.
Inventors
- 👤 Warner Jan de Putter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:55
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/0015; B26F1/0061; B26D; B26D7/00; B26D7/08; B26D7/10; B29; B29C; B29C35/00; B29C35/16; B29C2035/1616; B29C2035/1658; B29C2791/00; B29C2791/001; B29K; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/258; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0405; Y10T83/041; Y10T83/0443; Y10T83/0596; Y10T83/263; Y10T83/283
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
In a process for perforating a thin-walled corrugated tube composed of a polyolefinic material by means of a punching or cutting operation, the improvement wherein prior to the punching or cutting operation the tube is sequentially (1) contacted with a liquid spray which is at a temperature of between about 0° to 5° C., and (2) contacted with a stream of air at a temperature less than the temperature of the water spray of step (1).
Claim 2
Dependent Claim
76 words
In a process for perforating a thin-walled corrugated tube composed of a polyolefinic material by means of a punching or cutting operation, the improvement wherein prior to the punching or cutting operation the tube is sequentially (1) contacted with a liquid spray which is at a temperature of between about 0° to 5° C., and (2) contacted with a stream of air at a temperature less than the temperature of the water spray of step (1).
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said liquid spray in step (1) is a water spray.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein the tube is composed of a polyolefinic material selected from the group consisting of polyethylene and polypropylene.
Claim 5
Dependent Claim
20 words
The process of claim 1, wherein the air of step (2) is at a temperature of up to 4° C.
Claim 6
Dependent Claim
20 words
The process of claim 4, wherein the air of step (2) is at a temperature of up to 0° C.
References Cited (Backward Citations)
US3910713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |