Hoechst Aktiengesellschaft

Hoechst Trevira Gmbh & Co Kg

Burkhard Bonigk

Ingolf Jacob

Hans-Joachim Bruning

August Schneider

Peter Kretschmer

Woven or laid structures comprising at least two systems of parallel threads, at least one of these thread systems having more than 10 threads per centimeter and comprising at least 10%, based on the thread system, of hybrid yarns comprising reinforcing filaments and lower melting matrix filaments composed of thermoplastic polymers. In such woven or laid structures, the matrix component can be melted to form textile sheet materials of adjustable gas and/or liquid permeability, which are especially useful for manufacturing airbags.

Woven and laid hybrid yarn structures of adjustable gas and/or liquid

A safety belt is made of a fabric of high-tenacity filament yarns made of phosphorus-modified copolyester having a yarn linear density of less than 2000 dtex, having a single-fiber linear density of less than or equal to 25 dtex and having a breaking elongation of less than 30%. The phosphorus-modified copolyester contains a bifunctional phosphorus compound in an amount of 0.1% to 5% by weight, based on the amount of phosphorus, in the polymer chain.

Low-flammability safety belts containing phosphorus-modified polyester

Described is a flat multifilament yarn with minimal opening tendency of the mutually bound-together filaments, expressed by the quantity

Flat multifilament yarn having low opening tendency and good compaction

A process for producing woven fabrics which includes the steps of i) producing a stabilized size-free flat multifilament yarn, ii) forming a warp form the flat multifilament yarn of step i), III) leasing the warp formed in step ii) into the heddles of the shafts and into the reed of a weaving machine, and iv) producing a woven fabric through the insertion of warp threads in the transverse direction to the coarse of the warp at a weft insertion frequency of at least 300 picks/minute. The tension on the stabilized and size-free flat multifilament yarn does not exceed 1.0 cN/dtex. Also described is a woven fabric having warp threads based on stabilized flat multifilament yarns woven without size, whose warp thread density is more than 30 ends/cm and whose weft thread density is at least 30 picks/cm.

Weaving process using warps of size-free flat multifilament yarns and

There are described a process and apparatus for measuring the degree of filament intermingling of an intermingled multifilament yarn. The intermingled yarn is moved through a self-conveying fluid jet (air jet). The yarn substantially fills out the jet channel and emerges from the jet in a virtually tensionless state. Owing to the pressure difference at the jet outlet, noncohesive yarn zones expand explosively in the manner of a balloon. After expansion, the yarn passes before a sensor means, preferably an electronic camera, which detects the lightness differences or light diffraction phenomena due to the yarn filaments and sends as a function thereof a signal to a signal processing means. The method of measurement of the invention makes it possible to obtain very accurate information about the nature of the intermingling (spot type or continuous) and also about the geometry of intermingling (for example number and spacing of intermingling nodes in the case of spot type intermingling).

Process and apparatus for measuring the degree of filament intermingling

Method for measuring the degree of intermingling of yarns where an optical sensor is used to register intermingled and non-intermingled yarn sections, which comprises performing the measurement on a yarn which has been laid with no or low tension onto a moving support which transports the yarn past the optical sensor at a selectable, constant speed at a distance suitable for registering the yarn properties, and an apparatus for carrying out this method.

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Konigsbrunn, Germany

Burkhard Bonigk