On the Treatment of Rayons with Synthetic Resins by Means of an Improved Method，Especially on Crepe Fabrics(Ⅱ) On the "pre-heating and Quenching" Method with Rayon Crepe Marocain， and Features of the Products therefrom.

In continuation of the preceeding report the present paper deals with the method of "Pre-heating and Quenching" of crepe marocain. The samples that were specially prepared were pre-heated respectively at 110°， 120° and 130℃ for various minutes， (1， 1.5， 2， 2.5， and 3 minutes，) and was quenched into the resin solution immediately after each pre-heating. The shrinkage of the cloth which attended on dipping was simultaneously measured， and which proved to be a good measure of the penetration of the resin solution into the interstices of the fiber. The samples were then cured at 130℃ for 10 minutes after intervened drying. The samples were then tested by running crease tester under 500g and 2000g loads， and the resin contents and the mode of distribution was studied. The optimum temperature of "Pre-heating" was found to be 120℃， and the time of heating 1. 5 minutes， folIowed by the dipping for 10 minutes in order to assure a good result. The dipping duration of an ordinary padding or mangling， usually within 60 seconds at best， was obviously suspected to be too short for such fabrics from the shrinkage curves obtained; and it was actually found that even 2 minutes' dipping was insufficient， causing the resin to deposit on the surface of the fibers and/or yarns， and accordingly giving an exceedingly poor crease recovery for the heavier load， a1though it showed a pretty high crease resistance for the lighter load. The sample properly treated showed a higher crease recovery for both lighter and heavier loads， with higher fixed resin contents and lower surface resin. Crepe marocain treated by the same principle under a series of most favourable conditions produced a highly improved fabric， having such an outstanding properties as being dimentionally stable with a slightest shrinkabitity on wetting，which，however，was 100% reversible on drying; being somewhat more elastic and lofty， and having an agreeable hand with a higher crease recovery as well as an increased strength for tear and wear. The present study throws light upon the theory and practice of resin-treatments of fabrics in general， although some modifications may be necessary in the actual application to various kinds of fabrics in question