Plastic and nonmetallic article shaping or treating: processes – Flame contact or reshaping by heat decomposition of work
Patent
1982-01-22
1983-07-19
Welsh, Maurice J.
Plastic and nonmetallic article shaping or treating: processes
Flame contact or reshaping by heat decomposition of work
264 25, 264 27, 264161, B29J 506
Patent
active
043943349
ABSTRACT:
A process and the apparatus for deburring moulded parts produced by pressing especially moulded parts of lignocellulose fibre mats. A small circumferential zone of the fibre mat between the edge contour of the moulded part to be deburred and the edge of the waste shoulder is thermically decomposed during pressing. The thermically decomposed material portion of the fibre mat is removed from the edge contour of the moulded part while taking off the moulded part from the press tools. The decomposition zone is limited by a circumferential groove shaped chamber provided in one of the press tools. The portion of the fibre mat enclosed in the chamber is practically uncompressed and the chamber is provided with different methods for the thermal decomposition. The decomposition methods cause a carbonization of the material in the decomposition zone which facilitates the removing of the waste shoulder from the moulded part so that an additional treatment by hand is unnecessary.
REFERENCES:
patent: 3578734 (1971-05-01), Woodard et al.
patent: 3702789 (1972-11-01), Dungan
Lignotock Verfahrenstechnik GmbH
Welsh Maurice J.
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