| abstract |
A process of making staple fibers of poly(trimethylene terephthalate) includes feeding undrawn yarn (1) to a dip tank (2), forwarding by rolls (3, 4) and wetted under water. Wetted undrawn yarn (1) is forwarded by rolls (5, 6, 7, 8, 10) to a first drawing stage in a dip tank (9) and is partially drawn between rolls (10,11) under water in the dip tank (9). The yarn (1~) is then partially drawn by rolls (11, 12, 13, 14, 15, 16) which are driven at a faster speed than roll (10). The partially drawn yarn (1~~) is then rewetted by water spray jets (17) and is further drawn by rolls (18, 19, 20, 21) and puller rolls (22, 23) which are driven at a faster speed than roll (16). Nip rolls (5~, 8~, 14~, 22~, 25~) are used to minimize yarn slippage. After the second drawing, a finish sprayer (24) applies a dilute processing finish to the drawn yarn (1~~~), which is then forwarded and maintened under tension by puller rolls (25, 26) into a suffer box crimper (27) by driven crimper nip rolls (26~), where it is crimped and thermofixed by application of steam (28). The crimped yarn (1~~~~) is then forwarded in a relaxed state throuph a conventional belt dryer (29), cut by a rotary cutter (30) and baled (31) for storage and shipping. |