Double doctor blades

Details Double doctor blades Double doctor blades

1998-07-23

2000-10-10

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Press forming means, press reshaping means, or vulcanizing...

425367, 425466, 425DIG235, 264175, B29C 5302, B29C 4716, B29C 4712

Patent

active

061295396

ABSTRACT:
A material transfer arrangement having a pair of generally cylindrical adjacent rolls which are counter-rotatable about their respective cylindrical axes and which define therebetween a nip between which material passes is disclosed. There is a corresponding pair of spaced apart doctor blades, each in close proximity to a corresponding one of the rolls so that material may be conveyed between the roll nip and the space between the doctor blades. In one form, the nip passes material to the space between the doctor blades and that space has a downstream restriction which causes the material to compress in an accordion-like way forming a corrugated material web. In another form, the doctor blades function to deliver thermoplastic extrudate to the nip between the rolls to form elongated sheets or webs of plastic material of improved uniformity.

REFERENCES:
patent: 616434 (1898-12-01), Coulter
patent: 2308972 (1943-01-01), Hasson
patent: 3050109 (1962-08-01), Monaco
patent: 3405757 (1968-10-01), Harvey et al.
patent: 4354814 (1982-10-01), Grimminger et al.
patent: 4886441 (1989-12-01), Lortz
patent: 5030079 (1991-07-01), Benzing, II
patent: 5679383 (1997-10-01), Ryan et al.

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