[54] IN SITU PRECIPITATED FIBROUS
LAMINATE AND METHOD OF PRODUCING
SAME
[76] Inventor: Ole-Bendt Rasmussen,
Forchwaldstrasse 23, CH-6318
Walchwil/Zug, Switzerland
[21] Appl. No.: 488,004
[22] Filed: May 2,1983
Related U.S. Application Data
[60] Continuation of Ser. No. 177,806, Aug. 13, 1980, abandoned, which is a division of Ser. No. 102,561, Dec. 11, 1979, Pat. No. 4,294,638, which is a continuation of Ser. No. 841,481, Oct. 12, 1977, abandoned, which is a continuation of Ser. No. 657,649, Feb. 12, 1976, abandoned.
[30] Foreign Application Priority Data
Feb. 12, 1975 [GB] United Kingdom 5971/75
[51] Int. a.3 B65H 81/00; B32B 31/00;
B29C 19/00
[52] U.S. a 156/176; 156/187;
156/229; 156/244.13; 264/173; 428/109
[58] Field of Search 156/229, 244.13, 176,
156/187, 195, 200; 478/109, 110, 113; 264/173
[56] References Cited
U.S. PATENT DOCUMENTS
3,281,897 11/1966 Mercer 423/380
3,499,822 3/1970 Rasmussen 428/293
3,505,162 4/1970 Rasmussen 428/294
3,565,744 2/1971 Rasmussen 428/137
3,632,711 1/1972 Rasmussen 264/171
3,677,873 7/1972 Rasmussen 428/155
4,113,546 9/1978 Anders 156/195
4,138,503 2/1979 Ziolko 264/173
4,207,045 6/1980 Rasmussen 425/133.1
4,227,957 10/1980 Keuchel et al 156/500
4,294,638 10/1981 Rasmussen 156/176
4,331,497 5/1982 Gilman et al 156/195
FOREIGN PATENT DOCUMENTS
1185736 3/1970 United Kingdom .
OTHER PUBLICATIONS
Rieche, "Outline of Industrial Organic Chemistry", 3rd
Ed., Chemical Publishing Co. Inc., 1970, p. 361-363.
Primary Examiner—William R. Dixon, Jr.
Attorney, Agent, or Firm—William J. Daniel
[57] ABSTRACT
Multi-layer fibrous sheet laminate having layers with criss-crossing predominate grain directions, each layer being a three-dimensional reticulate structure of polymer fibers precipitated in situ from a polymer solution in a solvent or swelling agent therefor. The layers are produced by extrusion from a slot onto a collecting surface moving away from the slot to impart the predominate grain direction thereto and the laminate can be produced in a single extrusion operation utilizing two sequentially arranged circular extrusion slots with a common tubular collecting surface while rotating such extrusion slots in different relative directions.
3 Claims, 10 Drawing Figures
