7.2 General Situation of Processing Heat setting can be done with either dry or steam. Polyester is usually heat set dry while nylon may be heat set either dry or with steam. Continuous heat setting of flat fabrics is usually done with dry heat by impinging hot air on the fabric in a tenter frame. Steam heat setting is often done in an autoclave or may be done using continuous steaming equipment
7.2 General Situation of Processing • Heat setting can be done with either dry or steam. Polyester is usually heat set dry while nylon may be heat set either dry or with steam. Continuous heat setting of flat fabrics is usually done with dry heat by impinging hot air on the fabric in a tenter frame. Steam heat setting is often done in an autoclave or may be done using continuous steaming equipment
7. 2. 1 Dry setting machine and process 7.2.1. I Dry setting machine see also Abb.7.290, p. 184 Pig 7-1, and Montex
7.2.1 Dry setting machine and process 7.2.1.1 Dry setting machine see also Abb.7.290, p. 184 Pig.7-1, and Montex
7.2.1.2 Process width: 2-3 cm bigger than finished size overfeed: 30%(Cloth feeding device Temperature and time: see also P453 Tab. 31 doffing(cropping) <50 oC(cold air; cooling cylinder)
7.2.1.2 Process • width: 2-3 cm bigger than finished size • overfeed : 30% (Cloth feeding device) • Temperature and time : see also P.453 Tab.31. • doffing(cropping): < 50 oC(cold air; cooling cylinder)
7.2.2 Wet setting Saturated steam The presence of water apparently promotes molecular chain rearrangements which increase the size of openings through which dyes can diffuse
7.2.2 Wet setting • Saturated steam • The presence of water apparently promotes molecular chain rearrangements which increase the size of openings through which dyes can diffuse
7.2.3 Arraignment of Working Procedure Heat setting can be done before any wet treatment after scouring and mercerizing or after dyeing of the fabric
7.2.3 Arraignment of Working Procedure • Heat setting can be done: • before any wet treatment, • after scouring and mercerizing, • or after dyeing of the fabric