Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1988-10-19
1990-10-16
Jenkins, Robert W.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366 89, 366 90, 366319, 366323, B29B 106
Patent
active
049630334
ABSTRACT:
An extruder for processing wood particles, shavings or sawdust is particularly useful for the production of a refined product exhibiting a large number of separated, individual fibers each of a relatively long length as is desirable in the production of a fiber core for a composite particle board. The extrusion apparatus comprises an elongated barrel and a flighted screw rotatable within the barrel, with the final downstream section of the screw being of a configuration to sequentially present three processing zones each having a compression region, a restricted region and a decompression region. The three processing zones of the final screw section cooperate with a compression region and restricted region formed in the final head section to choke the advancement of wood materials through the extruder sufficiently to enable satisfactory processing of the same without the use of a final die or restricted orifice disposed on the outlet of the extruder barrel. In particularly preferred forms, restriction elements in the form of rectangular bars are disposed across the grooves of the screw and grooves of the head in the restricted region, and the bars are oriented in acute angular relationship relative to each other in scissors-like fashion to promote rolling and twisting apart of the fibers while maintaining the longitudinal integrity of the same.
REFERENCES:
patent: 2765491 (1956-10-01), Magerkurth
patent: 3687423 (1972-08-01), Koch
patent: 3897938 (1975-08-01), Kim
patent: 4107788 (1978-08-01), Anders
patent: 4140400 (1979-02-01), Lovegrove
Huber Gordon R.
Schmelzle Lawrence E.
Jenkins Robert W.
Wenger Manufacturing Inc.
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