Abstract:
The present invention provides protective goods, for example arctic clothing which allows long-time working even under the low temperature environment; said protective goods being characterized by excellent workability, heat-insulation and anti-static feature, without being hardened and embrittled, especially at the temperature of -10 degrees Celsius or below, further, under the environment of very low temperature such levels as -30 degrees Celsius or -60 degrees Celsius, furthermore even under the environment of extremely-low temperature on the level of -100 to -250 degrees Celsius. Protective goods made from a multiple-layer composite cloth, where the composite cloth comprises a surface fabric, an intermediate fibrous-insulator and a lining fabric, mainly composed of aramid fiber, respectively, wherein 1) the surface fabric and the lining fabric, comprises meta-aramid fiber by weight of 50 to 100 percent, para-aramid fiber by weight of 0 to 10 percent and other flame-retardant fiber by weight of 0 to 40 percent, with provision that the total weight-percent of meta-aramid fiber, para-aramid fiber and other flame-retardant fiber, is 100; 2) the intermediate fibrous-insulator comprises a multiple-laminated felt made from aramid fiber; and 3) electro-conductive yarns (a) are arranged along the lengthwise direction of the surface fabric at a density of 1 to 5 per inch and additional electro-conductive yarns and/or tapes (b) are arranged along the direction intersecting the lengthwise direction to form contact points with the electro-conductive yarns (a), whereby triboelectric charge on the outside surface of the protective goods is less than 0.6 micro-coulomb/m2.
Abstract:
A polyester fiber highly heat-resistant in a rubber matrix and useful as a reinforcing material for rubber articles, has a tensile strength of 8 g/d or more and is composed of a core portion made from a polyester resin and a skin portion made from a polyester resin and covering the core portion, the skin portion being in an amount of 5% to 20% based on the entire amount of the fiber and having a lower orientation and/or lower crystallinity than the core portion, which polyester fiber has been produced by treating a surface portion of a homogeneous polyester fiber consisting essentially of a polyester resin with a solvent capable of swelling the polyester resin or by coating a precursory polyester fiber for the core portion with a polyester resin for the skin portion.
Abstract:
An air bag having reinforcing belts and exhibiting a high burst strength and excellent safety, comprises a circular top cloth, a circular bottom cloth seam-joined to the top cloth and having an inflator-joining circular hole located in the center portion thereof, top and bottom reinforcing cloths seam-joined to center portions of the top and bottom cloths and a plurality of reinforcing belts located on inside faces of the top and bottom cloths, in which the air bag and end portion of each reinforcing belt is connected to the top reinforcing cloth or a top belt catcher seam-joined to the top cloth, the opposite end portion of the reinforcing belt is connected to the bottom reinforcing cloth or a bottom belt catcher seam-joined to the bottom cloth and each of the top and bottom cloths is seam-joined to a corresponding reinforcing cloth and optionally a corresponding belt catcher by a plurality of concentrically closed seam lines which satisfies a particular relationship.
Abstract:
A non-coated and uncalendered polyester filament woven fabric useful for an air bag, having a low air permeability even after a dry or wet heat aging, includes a plurality of polyester multifilament warp and weft yarns having (1) a maximum thermal stress of 0.8 g/denier or less determined between room temperature and the melting point of the yarns, at a heating rate of 150.degree. C./min and at a fixed length of the yarn under an initial load of 0.08 g/denier, (2) a maximum thermal shrinkage of 25% or less determined between room temperature and the melting temperature of the yarn at a heating rate of 150.degree. C./min under an initial load of 0.08 g/denier without restricting the shrinkage of the yarns, (3) a limiting viscosity number of 0.80 to 0.95 dl/g determined in a concentration of 1.2 g/100 ml in o-chlorophenol at 25.degree. C., and (4) a content of terminal carboxyl groups of 5 to 35 equivalent per ton.
Abstract:
A filament, fiber and yarn consisting of a naphthalate polyester containing at least 85 mol % of ethylene-2,6-naphthalate units and having an intrinsic viscosity of 0.3 to 1.0, said filament, fiber and yarn having a diffraction intensity ratio (R) between a Bragg reflection angle 2.THETA. = 18.7.degree. and 2.THETA. = 15.6.degree., as determined by the X-ray diffraction method, being in the range of 0.15 to 1.73.Electrically insulating material can be produced by heat-treating a fabric consisting mainly of the above naphthalate polyester fibers.
Abstract:
A filter cloth for air bags comprises a synthetic fiber woven fabric having (1) a ground weave structure segment having a single plain weave structure or a single twill weave structure and (2) a plurality of high gas-permeability weave structure segments substantially evenly distributed in the ground structure segment, exhibiting an air permeability higher than that of the ground structure segment and having (A) a mock leno weave structure having pinholes, (B) a double plain weave structure or (C) a double twill weave structure, and allows, when an air bag is formed from the cloth, a layout for cutting and a cutting of the cloth to be made freely and when the resultant air bag is inflated, the bag allows an inflation gas to instantly flow out from the bag so as to ensure the safety of the occupant.
Abstract:
A polyester fiber composed of a polyester comprising ethylene terephthalate units as the main recurring units and having an intrinsic viscosity of at least 0.9, which has an amorphous orientation degree of 0.3 to 0.55 and a crystal melting point of at least 265.degree. C.
Abstract:
A thermally improved polyester weft yarn is provided by melt-spinning a blend of a polyethylene terephthalate polymer and a small amount of polymer having a glass transition temperature of at least 10.degree. C. higher than that of the polyethylene terephthalate polymer. The yarn has a break elongation of 70% to 200% and a dry heat shrinkage of +5% to -2%, and is capable of withstanding a severe heat-treatment, for example, at 245.degree. C. for 2 minutes during dipping and curing process of a tire cord fabric comprising the same. Even after such heat-treatment, the yarn shows a residual break elongation of more than 60%. Thus, the weft yarn extends uniformly, without breakage, to a toroidal shape during a tire building process, keeping warp cords at a equi-distance relation. A tire cord fabric comprising the weft yarn of the invention finds its use as the carcass in the form of single ply in a radial tire.
Abstract:
A method for drawing and heat-treating an undrawn polyester yarn by drawing the polyester yarn between a heated feed roller and at least one heated draw roller, wherein the surface temperature of the last draw roller is progressively raised from its yarn in-coming side to its yarn out-going side, the yarn is shrunken both on the last draw roller and between the last draw roller and the take-up roller, and the yarn is cooled on the take-up roller. Further, after the method has resumed after being stopped, the running speed of the yarn on the take-up roller is maintained at not more than (100-5.7.times.S)m/min., wherein S is the total shrinkage of the yarn until the yarn heated during the stoppage has been allowed to shrink in the subsequent step. The yarn is then passed over the take-up roller at a running speed of 200 to 1200 m/min. An apparatus for performing the above method, characterized by the provision of a shrinking part in the last draw roller, means for heating the surface temperature of the last draw roller progressively from its yarn in-coming side to its yarn out-going side and a groove on a separator roller associated to the penultimate draw roller for regulating the yarn path of the last turn of the yarn.
Abstract:
A filament, fiber or yarn consisting of a naphthalate polyester containing at least 85 mol % of ethylene-2,6-naphthalate units and having an intrinsic viscosity of 0.45 to 1.0, said filament, fiber or yarn having a diffrection intensity ratio (R) between a bragg refection angle 2.theta. = 187.7.degree. and 2.theta. = 15.6.degree., as determined by the X-ray diffraction method, being in the range of more than 1.73 and up to 5.00.Electrically insulating material can be produced by heat-treating a fabric consisting mainly of the above naphthalate polyester fibers and with a sleeve consisting mainly of the above naphthalate polyester fibers.