Abstract: In a method for the production of industrial filament yarns, by swirling a polyester multifilament at increased temperature, under a thread traction force of less than 140 cN, in an air-loaded swirl nozzle consisting of a nozzle body with a perforated plate and a baffle plate, the heat is directly transmitted to the polyester multifilament and the air is directly transmitted, via the nozzle body, to a highly heat-conductive metal block which is connected directly to the baffle plate and in which a bore is provided for receiving a heating body.

Abstract: In method for the production of industrial filament yarns by swirling a polyester multifilament at increased temperature, under a thread traction force of less than 140 cN, in an air-loaded swirl nozzle consisting of a nozzle body with a perforated plate and a baffle plate, the heat is directly transmitted to the polyester multifilament and the air is directly transmitted, via the nozzle body, to a highly heat-conductive metal block which is connected directly to the baffle plate and in which a bore is provided for receiving a heating body.

Abstract: The invention concerns a method for making industrial continuous filament yarn by entangling a polyester multifilament yarn at high temperature, under yarn traction force less than 140 cN. By means of a tangling cop tube consisting of a body (1) provided with a perforated plate (2) and a deflection plate (3), heat is directly transmitted to the polyester filament and the air passing through the cop tube body (1) is directly transmitted to a metal block (8) with high thermal conductivity directly connected to the deflection plate (3). In the device for implementing said method, the deflection plate (3) is directly connected to a metal block (8) with high thermal conductivity, wherein a bore (7) is provided for housing a heating element. The polyester continuous filament designed for spinning applications, with a yarn count of 500-2000 dtex, has a resistance of at least 70 cN/tex for a breaking elongation less than 24%, and a knot strength higher than 80% and a spacing between 2 knots more than 4.0 cm.

Abstract: The process for preadherizing a drawn polyester filament to improve adhesion of rubber material with the filament includes applying a preadherizing agent to a running drawn polyester filament. The preadherizing agent is made by mixing a first solution containing a polyepoxide and a second solution containing a tertiary amine. In order to minimize soiling of the applicators used to apply the solutions to the running drawn polyester filament, the first solution is applied to the running drawn polyester filament at a site spaced a predetermined distance from the site at which the second solution is applied.