Process and apparatus for fixing synthetic fibrous materials and dyestuffs

Claim 2

A process as claimed in claim 2, wherein the velocity of the heated gas ranges between 0.5 and 5 m/sec.

Claim 3

A process as claimed in claim 3 wherein the velocity of the heated gas is greater than 2 m/sec.

Claim 4

A process as claimed in claim 1 wherein the fibrous material is subjected to the thermosetting operation without tension in warp and weft.

Claim 5

A process as claimed in claim 5, and wherein the fibrous material is transported onto the drum zone with an overfeed sufficient to compensate for corresponding shrinkage of the goods in their warp.

Claim 6

A process as claimed in claim 1, wherein the fibrous material is treated alternatively on opposite sides with heated gas.

Claim 7

A process as claimed in claim 1, wherein the fibrous material fed is passed alternately over and around successive cylindrical drum zones, whereby the heated gas passes through the fibrous material first in one direction and then in the opposite direction relative to one side of the material.

Claim 8

In a process for continuously thermosetting synthetic fibrous materials consisting of a polyolefin, polyamide, linear polyester, cellulose triacetate, polyacrylonitrile, polyvinyl chloride or a mixture thereof with each other or a mixture thereof with wool, silk, native or regenerated cellulose fibers, or for continuously thermosoling on said fibrous materials dyestuffs being fixed thereon by heat, or for simultaneously carrying out the aforegoing thermosetting and thermosoling operation in a continuous manner, the fibrous material being exposed continuously to the treatment with an inert gaseous fluid at a temperature between 170* and 230*C., not exceeding 25 seconds, the improvement of which comprises: feeding in and transporting across the treatment zone a web or band of the said fibrous material in its open width over at least one rotating, perforated drum means of endless conveyor belt means which on its outer, peripheral surface is covered with at least one layer of a fine-meshed sieve fabric; passing simultaneously said heated gas through the fibrous material and the sieve material from the exterior of said drum or conveyor means so that tHe fibrous material is pressed onto the sieve fabric and kept in contact therewith.