Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1974-04-19
1976-04-20
Ansher, Harold
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
264 41, 264 48, 264DIG14, 428219, 428310, 428332, B29D 2700, B29F 100
Patent
active
039521230
ABSTRACT:
A shaped, elongated board having shaped face surfaces is formed of a foamed thermoplastic material and may be substituted for wood or composite moldings which are now used in the manufacture of frames for pictures and the like. The molded board has a cellulated interior and a density that varies continuously between a greatest density at the outer surface of the board to a least density at the greatest spacing inwardly of said surface and without discreted delineation between the relatively denser surface and the lesser dense interior of the board. The average bulk density of such a product is in the range of between about 24.7 and 33.5 lbs. per cubic foot, which is approximately equivalent to that of natural wood. The board has a good quality surface finish and where appropriate can accurately replicate an ornamental surface design for the finished frame. The molded board can be subsequently processed in the same manner as present wood moldings with existing production tooling and equipment. This processing includes cutting, joining and surface-finishing such as painting and antiquing.
A process for manufacturing the board is provided in which a foamable polymeric material is mixed with a blowing agent in particular proportions and aliquot portions of the mixture are then injected directly into an elongated mold through a plurality of closely-spaced injection nozzles.
REFERENCES:
patent: 3644168 (1972-02-01), Bonk et al.
Ferrigno, Rigid Plastics Foams, Reinhold Pub. Corp., N.Y., 1964, pp. 166-167.
Union Carbide, Structural Foam, May 1973, pp. 5-8.
Europlastics Monthly, Oct. 1973, pp. 77-80.
Ansher Harold
Lettvin Norman
Thibodeau Paul J.
Turner Manufacturing Company
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