Abstract:
A spin dope composition produces a polymeric fiber useful in non- cryogenic gas separation. The composition includes polysulfone as the polymeric component, two solvents, in which the polymer is soluble, and a non- sol vent, in which the polymer is insoluble. The solvents preferably include N -methyl -pyrrol i done (NMP) and N,N-dimethyl acetamide (DMAC), and the non-solvent preferably includes triethylene glycol (TEG). Fibers made from the present composition have been found to exhibit superior properties of gas flux and selectivity, as compared with fibers made from spin dopes having only one solvent component.
Abstract:
The invention relates to a method for producing a bristle, especially for a toothbrush. A filament thread is cooled following extrusion, re-heated and stretched, and optionally heated under stress. According to the invention, the filament thread is heated without any stress or with barely any stress. This allows for additional annealing which considerably improves the wear properties of the bristle in particular.
Abstract:
The invention relates to a process for producing technical polyester yarns in which, for pre-drawing purposes, polyester filaments are heated in a heating region to a above the glass transition temperature and swept in counterflow by a gaseous medium. The polyester filaments are then re-drawn with an individual titre > 1 and a predetermined elongation ratio and wound at high speed.
Abstract:
The invention relates to a process and an apparatus for the production of a low-shrinkage aliphatic polyamide fibre, in which polyamide is extruded through a spinneret (2) to form filaments, then cooled and combined to form at least one yarn (6), wherein the at least one yarn (6) is subjected to drawing between the spinneret (2) and a pair of inlet rolls (7), then in a further multi-stage drawing step is subjected to 4-fold to 6-fold drawing by means of pairs of draw rolls, the pairs of draw rolls successively heating the yarn and at least the last pair of draw rolls (10) having a temperature of 5°C to 20°C below the melting point of the yarn (6), the yarn (6) being relaxed by from 6 % to 10 % in a subsequent at least three-stage relaxation zone and being kept in a temperature range of 5°C to 15°C below the melting point of the yarn (6), and subsequently being wound up on a reel device (14). The invention further relates to a yarn composed of a low-shrinkage aliphatic polyamide fibre.
Abstract:
본 발명은 시트벨트용 고강력 폴리에스테르 섬유에 관한 것으로, 특히, 고유점도가 0.8 내지 1.5 dl/g이고, 인장강도가 8.8 g/d 이상이고, 총섬도가 400 내지 1,800 데니어인 시트벨트용 폴리에스테르 섬유 및 그의 제조방법에 관한 것이다. 본 발명의 폴리에스테르 섬유는 고강력, 저모듈러스, 고신율의 필라멘트를 포함하여 수축율을 현저히 낮추며 우수한 기계적 물성을 확보함에 따라, 제직밀도 260 본/인치 이하에서도 충격흡수성이 우수하고 내마모성 및 내열 장력 유지율이 현저히 향상된 시트벨트를 제조할 수 있다.
Abstract:
Processes for preparing ultra-high molecular weight polyethylene ("UHMW PE") filaments and multi-filament yarns, and the yarns and articles produced therefrom. Each process produces UHMW PE yarns having tenacities of 45 g/denier to 60 g/denier or more at commercially viable throughput rates.
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.