Packing sheet calender and process for the production of packing

Details Packing sheet calender and process for the production of packing Packing sheet calender and process for the production of packing

1993-07-07

1995-10-03

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

Including ventilating type hood or chamber encasing a...

Recovering or recycling gas or vapor

425 75, 4251744, 425210, 425363, B29C 3508

Patent

active

054547040

ABSTRACT:
A packing sheet is formed on a calender having a rotatable large diameter heated cylinder and a rotatable smaller diameter unheated cylinder, with a gap between the cylinders, by feeding a preformed mixture of rubber material, fiber and solvent into the gap between the cylinders while the cylinders are rotating in opposite directions to form on the circumference of the large diameter cylinder a layer of progressively increasing thickness of the mixture during successive rotation of the cylinders. While the cylinders are thus rotating, heat from an external heat source is applied to the outer surface of the layer of material on the large diameter heated cylinder so that the material is heated both by heat from the large diameter heated cylinder and heat from the external heat source and is thereby vulcanized to form a cylindrical packing sheet. The cylinders are then stopped, the packing sheet is cut lengthwise of the cylinder and is stripped from the cylinder.

REFERENCES:
patent: 1504183 (1924-08-01), Conger et al.
patent: 2201747 (1940-05-01), Staudt
patent: 2259355 (1941-10-01), Sebrell
patent: 3210447 (1965-10-01), Cyr et al.
patent: 3271504 (1966-09-01), Bergstrom et al.
patent: 3444289 (1969-05-01), Hedberg et al.
patent: 3564656 (1971-02-01), Barnett
patent: 3999911 (1976-12-01), Matsubara
patent: 4025263 (1977-05-01), Morino et al.
patent: 4605366 (1986-08-01), Lehmann et al.

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