Process for the manufacture of tubing based on cellulose hydrate

Details Process for the manufacture of tubing based on cellulose hydrate Process for the manufacture of tubing based on cellulose hydrate

1981-03-26

1982-10-12

Beck, Shrive P.

Coating processes

Interior of hollow article coating

Vacuum or pressure utilized

427230, 427394, 118 18, 118 20, 118 44, 118 56, 118105, 118106, 118117, 118DIG10, 118408, 428 36, 426135, 426138, 1381181, B05D 140, B05D 722

Patent

active

043539394

ABSTRACT:
Disclosed is a process for coating the inside of a length of tubing comprising the steps of forming at least one loop of tubing with a downwardly inclined portion and an upwardly inclined portion; filling the cavity of the tubing forming the loop with a coating liquid; transporting the tubing along its longitudinal axis in a substantially vertically upward direction to coat the inside surface of the tubing above the level of the coating liquid with an initial layer of coating liquid; constricting the tubing adjacent to and above the level of the coating liquid with a metering device having a constriction zone which flattens a portion of the tubing passing therethrough to substantially eliminate all of the initial layer thereon and partially flattens the remaining portion of the tubing to allow a desired quantity of coating liquid to remain on the tubing issuing from the constriction zone; filling the cavity of the tubing issuing from the constriction zone with support gas; and, exposing the tubing to the action of heat at a sufficiently high temperature to fuse the coating layer to the inside thereof and form an uninterrupted film. Also disclosed is an apparatus for carrying out the process.

REFERENCES:
patent: 2210436 (1940-08-01), Weingand et al.
patent: 2901358 (1959-08-01), Underwood et al.
patent: 2901358 (1959-08-01), Underwood et al.
patent: 3378379 (1968-04-01), Shiner et al.
patent: 3378379 (1948-04-01), Shiner et al.
patent: 3413169 (1968-11-01), Krings et al.
patent: 3451827 (1969-06-01), Bridgeford
patent: 4233341 (1980-11-01), Hammer et al.
patent: 4287217 (1981-09-01), Hammer et al.

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