Extruding head for making reticulated seamless tubes

Details Extruding head for making reticulated seamless tubes Extruding head for making reticulated seamless tubes

1978-03-14

1980-02-19

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Severing means is perforator

425309, 425467, B29D 2304

Patent

active

041892925

ABSTRACT:
A relative nutational movement is provided between a member carrying teeth or other radial projections and a member against which these projections bear, these two members being just downstream of an annular extrusion gap that produces a plastic tube which is slit by the teeth or other projections passing through the tube wall in succession and bearing against the backing member. As it comes out from the slitting or punching produced by these members, the tubular material is stretched to and over a mandrel and cooled there to produce a tubular netting or a perforated sheath. Either the toothed member or the backing member may be fixed while the other is moved in a movement of nutation and the toothed member may have externally or internally directed teeth.

REFERENCES:
patent: 3132985 (1964-05-01), Moore
patent: 3703116 (1972-11-01), Doll
patent: 3817671 (1974-06-01), Lemelson
patent: 3841815 (1974-10-01), Labarre

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