PROCESS FOR THE DRY TRANSFER OF ORGANIC COMPOUNDS TO WEBS OF MATERIAL

摘要

The invention provides a process for the continuous, dry transfer of organic compounds, in particular of finishing and improving agents, to webs of air-permeable organic materials, preferably to textile webs are of polyester, polyamide, polyacyclonitrile and/or cellulose, The process comprises the following steps:(1) applying to a carrier such as polytetrafluoroethylene or polyester sheet or glass cloth preparations which contain one or several compounds e.g. textile finishing agents that are converted into the vapour state at atmospheric pressure and at a temperature above 80.degree.C, preferably 100 to 220.degree.C optionally a binder which is stable below 250.degree.C and/or a solvent, and, optionally, drying said preparations.(2) bringing said carrier into contact with the side of the air-permeable web of organic material to be treated in such a manner that web and carrier advance together synchronously, the one superimposed on the other,(3) subjecting carrier and web alternately, optionally under mechanical pressure, to at least one heat treatment of at least 80.degree.C applied from the carrier side and one suction treatment from the web side, optionally combined with a second heat treatment of at least 80.degree.C applied from the carrier side, and continuing or repeating this treatment until the compound has been transferred to the web, which is fed in one or up to 10 layers, so that the same section of the web passes through the same heating/suction cycle one or up to 10 times, and (4) separating the treated web from the carrier. Advantageously, the web or alternately subjected to 2 to 20 heat and suction treatments, whereby the running speed of the web is up to 100 m/min. preferably 20 to 50 m/min. The invention also provides a suitable apparatus for carrying out the above process.