Abstract: A process for the production of a two-layer textile reinforcement for the production of bituminous sealing sheets for roofing consists first, from a first layer based on nonwoven cloth, in consolidating this nonwoven cloth by mechanical or hydraulic bonding and in thermostabilizing it. This first consolidated and thermostabilized layer is then assembled with a second mineral fiber layer, either by counter-gluing, or by needling, or by seam knitting. These two latter assembly methods are used only when the second mineral fiber layer is in the form of a grid or cloth of continuous or discontinuous mineral filaments. The first assembly method by counter-gluing is itself used no matter what the structure of the second mineral filament layer, whether it be in the form of a grid or a cloth of continuous or discontinuous mineral fibers or in the form of a scrim of mineral fibers.

Abstract: A thermoplastic polyurethane molding compound, which is capable of being spun from the melt into filaments, is able to be enzymatically degraded within a few weeks. The compound contains exclusively linear components, and can be prepared from 100 parts by weight of a polyol combination from 70 to 90 parts by weight of polyester-polyol having a molecular weight of 2000, based on adipic acid with ethane diol, butane diol, hexane diol, neopentyl glycol, or diethylene glycol, and from 10 to 30 parts by weight of polyether polyol based on polyethylene glycol having a molecular weight of 800 to 4000. Also contained are 1,6-hexamethylene diisocyanate or, in its place, isophorone diisocyanate, or dicyclohexylmethane 4,4'-diisocyanate in an equivalency ratio to the entire polyol of the polyol combination of 2.8:1.0 to 12.0:1.0; as well as, as chain lengtheners, 1,4-butane diol and/or 1,6-hexane diol with an equivalency ratio to the entire polyol of the polyol combination of 1.75:1.0 to 11.3:1.0.

Abstract: An apparatus for producing filaments from meltable material utilizing centrifugal force includes a hollow body (2) rotating at high speed, whose bottom (5) the meltable material strikes from above in the solid state. The wall of the hollow body, shaped as a cylindrical casing, is formed by a heating device (4) which includes metal elements running in a rectangular and helical fashion, such that the interstices of the helix form the discharge openings for the molten material.

Abstract: A biodegradable substrate in sheet form which acts as a source of carbon and hydrogen in oxygen-poor water in biological water-treatment stages. The substrate is covered with at least one layer of a population of spontaneously growing denitrifiers. The substrate is a spun-bonded non-woven fabric weighing 10 to 1500 g/m.sup.2. It has a prescribed effective area that results in an ideal rate of denitrification per clarification stage at a prescribed rate of flow per area and time. The fabric is comprised of at least 50% continuous poly-.epsilon.-caprolactone filament with a mean molecular weight of 20,000 to 70,000. The individual filaments adhere to each other at their intersections.