Apparatus for the preparation of display blocks of urea formalde

Details Apparatus for the preparation of display blocks of urea formalde Apparatus for the preparation of display blocks of urea formalde

1977-10-07

1980-02-05

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

425377, 425817F, 425461, B29D 2700

Patent

active

041870662

ABSTRACT:
A method and apparatus for the preparation of thermosetting foam products on a substantially continuous basis, and wherein the products are characterized by uniformity of formulation, dimensional accuracy, and dimensional stability. The invention contemplates the utilization of an extruder which receives raw, partially or fully expanded resin and fillers or additives at inlets thereof, with initial expansion occurring within the confines of the extruder. The initially expanded resin is passed through a first expansion chamber with an intermediate expansion zone therein, with the outlet from the first expansion chamber being modestly constricted. From the first expansion chamber, the partially or fully expanded resinous product is moved through a second expansion chamber wherein the intermediate zone is enlarged, so as to permit substantially full expansion of the resinous material therewithin. From the second expansion chamber, the resinous material is passed through an outlet port in the form of an extrusion die, and received on a product receiving surface with a configuration substantially matching the configuration of the extrusion die for supporting the substantially completely expanded resin therein until cured to a self-supporting state.

REFERENCES:
patent: 3248464 (1966-04-01), Telkes
patent: 3523988 (1970-08-01), Roehr et al.
patent: 4017245 (1977-04-01), Lang

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