Method of producing heat-resistant crimped yarn

A method for treating the yarn cheese or the yarn corn, which comprises the process of making the yarn cheese or the yarn corn by winding the twisted yarn of a heat-resistant high functional fiber around a bobbin;

• the process of loading the yarn cheese or the yarn corn in an autoclave;
• the process of reducing the pressure in the autoclave loaded with the yarn cheese or the yarn corn to a pressure falling between 5.0×103 and 5.0×104 Pa;
• and the process of raising temperature in the autoclave to a temperature in the range of from 130 to 250° C. by providing steam having high temperature and high pressure or water having high temperature and high pressure into said autoclave.

A heat-resistant bobbin having a plurality of small holes on the surface of the cylinder and/or the flange thereof, wherein the diameter of a small through holes is 2 to 9 mm, and the hole area rate is 1 to 20%.

A device for producing a heat-resistant crimped yarn of a heat-resistant high functional fiber, which comprises a means for sealing up in an autoclave, a means for reducing the pressure in the autoclave to the pressure falling between 5.0×103 and 5.0×104 Pa, a means for providing steam having high temperature and high pressure or water having high temperature and high pressure into the autoclave, a means for controlling the temperature of steam having high temperature and high pressure or water having high temperature and high pressure to maintain in the range of from 130 to 250° C. for a period of time falling between 0.5 and 100 minutes, a means for draining water in the autoclave out and a means for decreasing the high pressure to the atmospheric pressure.