Apparatus for making a fibrous board-like product having a male

Details Apparatus for making a fibrous board-like product having a male Apparatus for making a fibrous board-like product having a male

1977-02-28

1978-01-10

Spicer, Jr., Robert L.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Serially arranged with preform reshaping means

264146, 264257, 4253241, 425385, 425404, 425406, B29C 300, B29C 1714

Patent

active

040676781

ABSTRACT:
Disclosed is a method and apparatus for making a board-like product capable of being formed into a duct section having a male end and a female end for joining sections together to form a duct. Inorganic fibers coated with a heat setable binder and collected in the form of a blanket are passed between heated moving surfaces to cure the binder in the top and bottom surface portions. The resultant partially cured blanket is then passed between one or more sets of heated platens to completely cure the binder and to shape the blanket to the desired thickness and configuration. A flat valley depression is formed longitudinally along the blanket down its center portion, and each edge is provided with a male edge, in the first set of platens. After the blanket has been shaped and cured, it is separated into two strips along the middle portion of the flat valley to form two strips, each having a female edge along one longitudinal edge and a male edge along the opposite edge. The method and apparatus of the present invention provides an improved female edge, i.e., one having a much smaller radius than produced in the prior art process and capable of forming better joints in air duct systems.

REFERENCES:
patent: 2674764 (1954-04-01), Eaby et al.
patent: 2720679 (1955-10-01), Ratliff
patent: 3071805 (1963-01-01), Merkle
patent: 3481813 (1969-12-01), Wiggers
patent: 3583030 (1971-06-01), Terry et al.
patent: 3976418 (1976-08-01), Leathers

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