Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1979-04-02
1980-12-30
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
156167, 15624418, 264167, 264DIG81, 425142, 425382N, B29C 1714
Patent
active
042422957
ABSTRACT:
The invention provides a process and apparatus for manufacturing flat plastic net. Tubular plastic net is made by extruding plastic material through coaxial circular counter-rotating die members to form a net structure having a plurality of crossing strands. The angular displacement of successive longitudinally-aligned junctions of the crossing strands is controlled, preferably by controlling the relative counter-rotation of the extrusion die members, and successive longitudinally aligned junctions are cut longitudinally within each junction. The tubular net so cut is opened out to form flat net.
The flat net so produced, the edges of which are characterized by successive longitudinal edge junctions, in which each edge junction is cut longitudinally within the junction, is particularly useful for fencing material, for example.
REFERENCES:
patent: 3437538 (1969-04-01), Ewing
patent: 3551543 (1970-12-01), Mercer et al.
patent: 3557268 (1971-01-01), Berretta et al.
patent: 3674898 (1972-07-01), Larsen
patent: 4057449 (1977-11-01), Livingston et al.
patent: 4123491 (1978-10-01), Larsen
Du Pont Canada Inc.
Woo Jay H.
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