Abstract: The method for continuous production of a multifilament stretchable weft yarn for tire cord fabric includes swirling polyester-POY-filaments with an initial titre of from 170 to 260 dtex by means of a gas having a pressure of from 0.5 to 3 bar in a swirling nozzle, and immediately thereafter, shrinking with an overfeed of from 40 to 80% at from 220.degree. to 240.degree. C. for at least 0.2 sec to form a stretchable multifilament weft yarn. This weft yarn has a rough surface with non-slip properties, a tenacity of greater than 7 cN/tex, an elongation at break of from 170 to 270% and a thermal shrinkage at 160.degree. C. of from +2% to -2%, measured at 160.degree. C. during 15 minutes at a pretension of 0.1 cN/tex.

Abstract: The invention concerns a polyamide-66-monofilament with improved initial modulus and with a titre of dtex 4 fl-150 fl. The strength of the monofilaments is at least 60 cN/tex for an extension of less than 25% and the specific LASE, in relation to the initial titre at 2% is at least 7.5 cN/tex, at 5% at least 18 cN/tex and at 10% at least 40 cN/tex, and the dry relaxation is less than 25%. The result is an improvement of about 40% in the LASE at 2% and an improvement of about 35% in the wet relaxation compared to standard polyamide (PA 66) monofilament. The precision fabric manufactured from the monofilaments disclosed is particularly suitable for direct use in direct printing onto woven fabrics and hollow articles.

Abstract: A copolyamide with an improved modulus of elasticity for the melt-spinning of filaments consists of at least 75 wt. % of a linear polyamide base polymer with a melting point of 150.degree.-320.degree. C. and at least 0.5 wt. % of a block comonomer which is incorporated into the base polymer and has a glass transition temperature (T.sub.g) between 130.degree. and 330.degree. C. and a degree of polymerization (DP) of <100. The filaments produced from the modified copolymer with an initial modulus of 500 to 1500 cN/tex are suitable for use in the production of technical fabrics.

Abstract: The spinning pump for melt spinning of polyamides includes a back plate (5), a front plate (7), a central plate (6) extending between the front plate (7) and the back plate (5) and a pair of gear wheels (8,8'). The central plate (6) is provided with a bore (10) for feeding a melt into the central plate and another bore (10') for feeding the melt out of the central plate. The bores (10,10') each have transverse partially circular cross sections with cross-sectional areas decreasing from the front side (6') of the central plate (6) to the back side (6"). The partially circular cross sections of each of the bores (10,10') have center points on a parabolic arc or path (13b) from the front side (6') to the back side (6") of the central plate (6). This shape and structure for the bores (10,10') prevents cracked deposits from forming inside the pump channels and increases the productivity of top-quality melt extrusion by over 10%.

Abstract: The method of making a pre-adherized polyester filament yarn with adhesion properties for rubber includes applying a pre-adherizing agent to a polyester filament yarn having a boiling water shrinkage value of <20% while spinning it at not less than 3200 m/min, heat treating the pre-adherized polyester filament yarn with hot air on a bobbin for several days at from 50.degree. to 90.degree. C., and then subjecting the conditioned POY to a single drawing step in which the take-off speed is 1.7 to 2.2 times faster than the inlet speed. Impregnated tire cord made from the polyester filament yarn so treated has a tensile strength of 60 to 70 cN/tex and a tempered shrinkage test value at 190.degree. C. of less than 3.5%, an adhesive power of 18 to 25 daN to rubber, an appearance grade of 2.5-4.0 and a dimensional stability value of greater than 24,000 cN/tex.sup.2.

Abstract: The soil-repellent monofilament for paper machine wire-cloths consists of at least 85% by weight of polyethylene terephthalate having a viscosity index (V.I.) of at least 96 dl/g and an added copolymer prepared from alkenes and perfluoroalkenes having a melting point from 255.degree. to 275.degree. C. To make the soil-repellent monofilament 1.5 to 5% by weight of tetrafluoroethylene is included by addition to the polymer melt of polyethylene terephthalate prior to extrusion. The soil-repellent monofilament produced by this method has a soiling index of <2 after 5 soiling and cleaning cycles.

Abstract: In an apparatus for the spin-drawing, on multiple ends, of thermoplastic filament yarns on at least two pairs of godets (1, 2 and 1', 2'), their axes of rotation (7 and 8) are arranged skew with respect to each other in such a way that the axis of rotation (8) of the one godet (2) is arranged to be able to pivot within a plane (12) and the plane (12) forms an angle (.beta.) of 10.degree.-60.degree. with the plane (10). The arrangement according to the invention makes it possible for the first time to spin and simultaneously draw in an integrated manner on multiple ends.

Abstract: Process for making a polyester having polyethylene terephthalate units including transesterifying a terephthalic acid ester with a glycol using a manganese salt as catalyst and then subjecting the product to a polycondensation reaction using a germanium-containing catalyst to form a polyester; adding phosphorous compounds to block 80 to 99% by weight of the active manganese salt thus leaving an unblocked portion of the manganese salt prior to the polycondensation; and adding 10 to 100 ppm of Ge at the end of a ethylene glycol stage of the polymerization so that the Ge and the unblocked portion of the manganese salts provide the germanium-containing catalyst for the polycondensation reaction. The P/Mn molar ratio being less than 1. The reaction mixture contains 10 to 100 ppm of manganese during the reaction.

Abstract: The method for producing dimensionally stable, low-shrinkage, chemically modified industrial polyester yarns by melt spinning at speeds of 1000 to 4000 m/min. utilizes a copolymer containing at least 85 percent by weight polyethylene terephthalate units and comonomers. During polyester production to lower the thermal shrinkage one or more conformationally fixed linear difunctional comonomers are added to the polymer melt. These difunctional comonomers have the general formula, X'--R--X, where R is an unsaturated linear alkyl group having from three to ten carbon atoms or a cycloalkyl or aromatic group with 6 or more carbon atoms, and X and X' are, independently, OR' or COOR", and R'=H or an alkyl group and, independently, R" is also H or an alkyl group.

Abstract: A friction-textured elastic yarn is prepared by twisting a single-component multifilament melt-spinnable polymer yarn having an initial modulus of 80 to 150 cN/tex and a melting point of at least 200.degree. C. at a speed of at least 200 m/min, the thus twisted yarn is heat-set at 160.degree. to 190.degree. C. to produce a fixated yarn, and the fixated yarn is friction-textured at a pretension of 0.5 to 3.0 cN/tex.

Abstract: A process of high-speed spinning of a set of thermoplastic monofilaments having a linear density from 1 to 30 dtex, includes spinning to obtain melt-spun thermoplastic monofilaments and airblast cooling of the melt-spun monofilaments. To produce a particularly fine monofilament at high winding speeds, the process also includes guiding the thermoplastic monofilaments directly over a fork-like friction element having axially parallel, spaced apart upper and lower contacting friction surfaces during the airblast cooling, and then spin finishing and winding up the thermoplastic monofilaments. An apparatus for melt-spinning including the friction element is described. The product monofilament produced by the process can have an elongation of 20 to 45%, a strength of 36 to 60 cN/tex; a boil shrinkage of 2 to 15%; an Uster % less than 1 and a uniformly round cross section.

Abstract: The process for making a polyamide filament having thermal and mechanical properties close to those of nylon 66 but without spherulites includes concentrating an aqueous solution of adipic acid-hexamethylenediamine salt containing from 1 to 10% by weight of .epsilon.-caprolactam and from 1 to 15% by weight of PA 6.HHT to form a condensed mixture; polycondensing the condensed mixture to form a polycondensed mass; and melt-spinning the polycondensed mass to form the polyamide filament. The process parameters are controlled to produce a polyamide filament consisting essentially of at least 80% by weight nylon 66 monomer, 1 to 10% by weight nylon 6 monomer and 1 to 15% by weight PA 6.HHT.

Abstract: A device to monitor a moving yarn for irregularities is described. A first sensor head (2) with a recess (6) and a second sensor head (3) with a recess (7) are arranged in the direction of yarn movement. The cross-sectional depth of the recess (7) in second sensor head (3) is deeper than that of the recess (6) of sensor head (2). It is therefore possible, for example, to record separately slubs and projecting fibers. The monitoring device can be automated and used for quality control of any type of yarn.

Abstract: In a process for manufacturing a smooth, dimensionally stable, shrink-resistant polyester filament yarn, the starting product is a polyester POY. The polyester POY (5a) is cold-stretched (5b) in a stretching ratio of 1.8 to 2.5 and then relaxed with an advance of approximately 3 to 10%. The yarn so obtained has an initial modulus of 600 to 1200 cN/tex, a reversibility limit greater than >8 cN/tex, and an extensibility less than <20%. It is used as a high-strength polyester yarn whenever dimensional stability is essential.

Abstract: The method for producing dimensionally stable, low-shrinkage, chemically modified industrial polyester yarns by melt spinning at speeds of 1000 to 4000 m/min. utilizes a copolymer containing at least 85 percent by weight polyethylene terephthalate units and comonomers. During polyester production to lower the thermal shrinkage one or more conformationally fixed linear difunctional comonomers are added to the polymer melt. These difunctional comonomers have the general formula, X'--R--X, where R is an unsaturated linear alkyl group having from three to ten carbon atoms or a cycloalkyl or aromatic group with 6 or more carbon atoms, and X and X' are, independently, OR' or CPPR", and R'=H or an alkyl group and, independently, R" is also H or an alkyl group.

Abstract: A method of producing a smooth, cold-drawn multifilament yarn from a polyester POY comprising cold-drawing of the polyester POY to a draw ratio of at least 1.6 and subsequent hot-relaxing the polyester POY under an over-feed of 10 to 20%, and a polyester yarn produced by this method.

Abstract: A process for the production of dimension-stable polyester cord by means of a two-stage heat treatment including initially stretching at 205.degree.-250.degree. C. between 3 and 7 percent, and subsequently relaxing at 205.degree.-250.degree. C. between 3 and 7 percent. There results a dimension-stable polyester cord displaying a shrinkage of less than 1.2 percent.

Abstract: A catching ribbon for catching and holding a thread on a thread support, such as a thread wind-up bobbin rotating at high speed, is provided at its circumference with catching elements. These catching elements comprise thread engaging portions, such as hooks. The space between two thread engaging portions of two immediately adjacent catching elements are positioned to allow a single thread passage therebetween but precluding thread retro-movement. The catching elements comprise miniature pins provided with heads configured to form the thread engaging portions, such as semi-circular heads or anchor-like heads similar to kedge anchors. Catching elements with a single thread engaging portion, such as a single hook, also may be provided. Successive rows of the single-hook catching elements or successive rows of the double-hook catching elements may be arranged in staggered relationship.

Abstract: A yarn carrier for winding a filamentary thread having a cylindrical barrel with conical ends and two annular grooves on the inside of the barrel conical end, and a take-up ring disposed for coaxial displacement on one of the ends. The inside surface of the take-up ring is provided with an annular detent adapted to snap into one of the two grooves.

Abstract: A method for prevention wall indentations in a splice region of the tire carcass by joining two cut edges of the tire carcass and applying to the splice region a splice tape which overlaps the cut edges of the carcass.