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Publication numberUS2558632 A
Publication typeGrant
Publication dateJun 26, 1951
Filing dateJun 17, 1947
Priority dateSep 7, 1940
Publication numberUS 2558632 A, US 2558632A, US-A-2558632, US2558632 A, US2558632A
InventorsTrozmuller Friedrich Josef
Original AssigneeSemperit Ag
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process for forming bodies of artificial resin and fibrous material
US 2558632 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


AGENTS Patented June 26, 1951 [TED OFFICE PROCESS FOR FORMING BODIES F ARTI- FICIAL RESIN AND FIBROUS MATERIAL Application June 17, 1947, Serial No. 755,225 In Germany September 7, 1940 Section 1, Public Law 690, August 8, 1946 Patent expires September 7, 1960 1 Claim.

The invention relates to a process for pressing bodies of artificial resins. When pressing artificial resin bodies and in particular such as are composed of fibrous material impregnated with phenol resins, the pressing of which is carried out in the hot state, it has been found practically impossible to prevent the adhesion of the artificial resin bodies to the parts of the form or the dies of the press.

For this purpose fatty substances, waxes, and the like have been added to the artificial resins, already during the pressing stage, but this measure has not eliminated the disadvantages mentioned above, apart from the fact that these additions alter the entire artificial resin mass. Furthermore, it has been proposed to lubricate the parts of the form with parafiin, or the like without, however, attaining the result desired. Besides, this treatment with parafiin was found to be disadvantageous since the hardening of the plastic masses is impaired, in particular retarded, considering that an accurate dosage of the quantity of fat just sufficient to detach the die from the form is impossible. The same negative result was obtained for the same reason when spraying a lubricating or greasing means on the form. Also the application of a cover of cadmium on the pressing faces was not successful. Finally experiments have been made with nonimpregnated absorbing papers inserted between the body of artificial masses proper and the respective part of the form. But this measure, too, was incapable of preventing the artificial resin body from sticking to the form.

The invention has for its object to eliminate these drawbacks, and substantially consists in incorporating a form lubricating means in the surface of the body to be pressed which contacts the form. Tests made have shown that the die does not stick or adhere to the form if the process according to the invention is applied.

The incorporation of the lubricating means in the surface zone of the stamped body, contacting the form parts, may be carried out in such a manner that at least one fibrous layer containing a lubricating means for the form is provided in the contacting zones. In case of bodies composed of fibrous layers, impregnated with artificial resins, the stamping of which according to the invention is of particular interest, the invention may be realized in a simple manner by adding the lubricating means required at least to one of the layers adjacent to the form.

The drawing shows an artificial resin body in side elevation by way of example, said body being composed of various fibrous layers which are impregnated with artificial resins.

The layers of the fibrous substance bodies containing artificial resins are designated by the numerals i and 2, Whereas the fibrous layers containing the lubricating means for the form are designated by the numerals 3 and. 4. During the pressing operation the layers 3 and will prevent the artificial resin body from sticking to the form parts. The fibrous substance bodies containing artificial resins and the fibrous layers containing the lubricating means may either be united in advance of the pressing operation and thus introduced into the press as a unit, or the individual layers may be inserted into the press separately, whereupon the press is closed, and the layers are heated.

While the invention has been shown in the particular embodiment described it is not limited thereto, as modifications thereof may be made without departing from the scope of the ap pended claim.

I claim: 7

In a process for forming bodies of artificia resins having a sheet of fibrous material welded to a surface thereof, the steps of inserting a layer of artificial resin and at least one sheet of fibrous substance impregnated with a lubricating material between press members, and pressing said layer and sheet together to form said body.


REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,164,099 Kline Dec. 14, 1915 1,352,436 Dickey Sept. 14, 1920 1,944,464 Richardson Jan. 23, 1934 2,067,580 Rohm Jan. 12, 1937 2,139,054 Wilson Dec. 6, 1938 2,293,914 Nanfeldt Aug. 25, 1942 2,303,436 Clark Dec. 1, 1942 FOREIGN PATENTS Number Country Date 760,048 Germany Nov. 8, 1944

Patent Citations
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US1164099 *Aug 18, 1914Dec 14, 1915John W BarkalowProcess and apparatus for making cement or concrete building-stone.
US1352436 *Dec 30, 1918Sep 14, 1920Westinghouse Electric & Mfg CoMethod of forming composite bodies
US1944464 *Mar 28, 1928Jan 23, 1934Cutler Hammer IncArt of treating plastic molding compositions including a fibrous filler and an organic binder
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DE760048C *Sep 8, 1940Jan 18, 1954Semperit Gummiwerke A GVerfahren zum Verpressen von Kunstharzkoerpern
Referenced by
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US2964800 *Aug 24, 1955Dec 20, 1960Roscoe DorsettManufacture of a wall
US4629650 *Dec 27, 1983Dec 16, 1986Asahi Kasei Kogyo Kabushiki KaishaProcess for producing molded thermoplastic resin
US6863970Jun 4, 2002Mar 8, 2005Penske CompositesFastener retention foam sheet and associated method
US6902694Jun 4, 2002Jun 7, 2005Penske Composites Inc.Fastener retention foam sheet and associated methods
US20030132542 *Jun 4, 2002Jul 17, 2003Penske Composites, Inc.Fastener retention foam sheet and associated methods
US20030134103 *Jun 4, 2002Jul 17, 2003Herman NovakFastener retention foam sheet and associated method
US20030143366 *Jan 10, 2003Jul 31, 2003Jerry FoleyPolymeric and fibrous laminate and methods of forming and using same
EP0113117A1 *Dec 28, 1983Jul 11, 1984Asahi Kasei Kogyo Kabushiki KaishaProcess for producing molded thermoplastic resin
U.S. Classification156/289, 264/338, 264/258
International ClassificationB29C70/42, B32B27/00, D06M23/14, B29C65/48
Cooperative ClassificationB32B27/00, B29C65/48, B29C70/42, D06M23/14
European ClassificationB29C65/48, B32B27/00, D06M23/14, B29C70/42