US3876737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calendered sheeting of thermoplastic materials
Assignee: BASF SE
•
Filing: 1972-12-06
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Granted: 1975-04-08
•
Expires: 1992-12-06
Abstract
Abstract Manufacture of calendered sheeting of thermoplastic materials, particularly polyvinyl chloride, which is free from flow lines. The calendered web of plastics material, on passing from the penultimate calender roll to the final calendar roll, is cooled by passing over smaller guide rolls. The resulting calendered sheeting may be used for the usual purposes, especially in packaging.
Inventors
- 👤 Martin Herner
- 👤 Guenter Mueller
- 👤 Guenter Hatzmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:38
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; Y; Y10; Y10S; Y10S425/00; Y10S425/235
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
IN A PROCESS FOR THE MANUFACTURE OF SHEETING OF VINYL CHLORIDE POLYMERS WHEREIN PREPLASTICIZING POWDERED VINYL CHLORIDE POLYMER IS PASSED THROUGH A TRAIN OF HEATED CALENDER ROLLS ROTATING IN OPPOSITE DIRECTIONS AND THE FORMED WEB IS REMOVED FROM THE PENULTIMATE CALENDER ROLL, THE IMPROVEMENT WHICH COMPRISES EFFECTING CONTROLLED COOLING OF THE WEB TO ELIMINATE FLOW LINES BY PASSING SAID WEB OVER ONE TO MORE GUIDE ROLLS, SAID GUIDE ROLL OR ROLLS BEING DRIVEN AT A PERIPHERAL SPEED WHICH IS ADJUSTED TO THE SPEED OF THE WEB, SAID GUIDE ROLL OR ROLLS BEING HEATED TO A TEMPERATURE LOWER THAN THE TEMPERATURE TURE OF SAID CALENDER ROLLS SO THAT SAID WEB IS COOLED BY FROM 3* TO 30*C, PASSING SAID WEB IS COOLED BY ROLL, AND COOLING SAID WEB AFTER IT IS REMOVED FROM SAID FINAL CALENDER ROLL.
Claim 2
Dependent Claim
136 words
IN A PROCESS FOR THE MANUFACTURE OF SHEETING OF VINYL CHLORIDE POLYMERS WHEREIN PREPLASTICIZING POWDERED VINYL CHLORIDE POLYMER IS PASSED THROUGH A TRAIN OF HEATED CALENDER ROLLS ROTATING IN OPPOSITE DIRECTIONS AND THE FORMED WEB IS REMOVED FROM THE PENULTIMATE CALENDER ROLL, THE IMPROVEMENT WHICH COMPRISES EFFECTING CONTROLLED COOLING OF THE WEB TO ELIMINATE FLOW LINES BY PASSING SAID WEB OVER ONE TO MORE GUIDE ROLLS, SAID GUIDE ROLL OR ROLLS BEING DRIVEN AT A PERIPHERAL SPEED WHICH IS ADJUSTED TO THE SPEED OF THE WEB, SAID GUIDE ROLL OR ROLLS BEING HEATED TO A TEMPERATURE LOWER THAN THE TEMPERATURE TURE OF SAID CALENDER ROLLS SO THAT SAID WEB IS COOLED BY FROM 3* TO 30*C, PASSING SAID WEB IS COOLED BY ROLL, AND COOLING SAID WEB AFTER IT IS REMOVED FROM SAID FINAL CALENDER ROLL.
Claim 3
Dependent Claim
28 words
A process as set forth in claim 1, wherein said final calender roll is rotated at a slightly higher speed than the speed of the penultimate calender roll.
Claim 4
Dependent Claim
38 words
A process as set forth in claim 1, wherein the diameter of each calender roll is from 40 to 70 cm. and the diameter of each of the guide roll or rolls is from 3 to 10 cm.
Claim 5
Dependent Claim
21 words
A process as set forth in claim 1, wherein the temperature of the final nip is from 200.degree. to 220.degree. C.
Claim 6
Dependent Claim
22 words
A process as set forth in claim 1, wherein polyvinyl chloride having a K value of from 55 to 65 is used.
Claim 7
Dependent Claim
29 words
A process as set forth in claim 1, wherein the calendered web is cooled by from 5.degree. to 15.degree. C. before it is returned to the final calender roll.
Claim 8
Dependent Claim
19 words
A process as set forth in claim 1, wherein the sheeting has thicknesses of from 200 to 1,000 .mu.m.
References Cited (Backward Citations)
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Cited
US1590638A
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US2326927A
Cited
US2236214A
Cited
US2946087A
Cited
US3328503A
Cited
US3346913A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |