The invention pertains to the technical field of urethane based materials, in particular to radiation curable urethane precursors that are cross-linkable in solid form and materials obtainable therefrom. In addition the invention pertains to methods for manufacturing these precursors and materials, and their uses. The invention is advantageous to the fields of i.e. coatings and biomedical applications.

The invention pertains to the technical field of urethane based materials, in particular to radiation curable urethane precursors that are cross-linkable in solid form and materials obtainable therefrom. In addition the invention pertains to methods for manufacturing these precursors and materials, and their uses. The invention is advantageous to the fields of i.e. coatings and biomedical applications.

A method for improving the quality of a polyester industrial yarn is provided. First, in the cooling process of preparing a polyester industrial yarn prepared by polyester spinning, the longitudinal height is kept unchanged, and the cross-sectional area of the slow cooling chamber is enlarged. The chamber maintains the surface temperature of the spinneret by means of heat preservation, and then uses an oil agent containing 67.30-85.58 wt % crown ether in the oiling process of polyester industrial yarn prepared by polyester spinning. Enlarging the cross-sectional area of the slow-cooling chamber refers to the cross section of the slow cooling chamber is changed from a circular shape to a rectangular shape while keeping the spinneret connected to the slow cooling chamber unchanged. The cleaning cycle of the spinneret is prolonged by 35-45%, the full package rate of polyester industrial yarn is larger than 99%.

A method for improving the quality of a polyester industrial yarn is provided. First, in the cooling process of preparing a polyester industrial yarn prepared by polyester spinning, the longitudinal height is kept unchanged, and the cross-sectional area of the slow cooling chamber is enlarged. The chamber maintains the surface temperature of the spinneret by means of heat preservation, and then uses an oil agent containing 67.30-85.58 wt % crown ether in the oiling process of polyester industrial yarn prepared by polyester spinning. Enlarging the cross-sectional area of the slow-cooling chamber refers to the cross section of the slow cooling chamber is changed from a circular shape to a rectangular shape while keeping the spinneret connected to the slow cooling chamber unchanged. The cleaning cycle of the spinneret is prolonged by 35-45%, the full package rate of polyester industrial yarn is larger than 99%.

Methods and systems of the present invention use mixed textile feedstock, which may include post-consumer waste garments, scrap fabric and/or other textile materials as a raw feed material to produce isolated cellulose and other isolated molecules having desirable properties that can be used and be used in the textile and apparel industries, and in other industries. A multi-stage process is provided, in which mixed textile feed material is subjected to one or more pretreatment stages, followed by at least two pulping treatments for isolating cellulose molecules and other molecular constituents, such as polyester. The isolated cellulose and polyester molecules may be used in a variety of downstream applications. In one application, isolated cellulose and polyester molecules are extruded to provide regenerated cellulose fibers and regenerated polyester fibers having desirable (and selectable) properties that are usable in various industrial applications, including textile production.

Methods and systems of the present invention use mixed textile feedstock, which may include post-consumer waste garments, scrap fabric and/or other textile materials as a raw feed material to produce isolated cellulose and other isolated molecules having desirable properties that can be used and be used in the textile and apparel industries, and in other industries. A multi-stage process is provided, in which mixed textile feed material is subjected to one or more pretreatment stages, followed by at least two pulping treatments for isolating cellulose molecules and other molecular constituents, such as polyester. The isolated cellulose and polyester molecules may be used in a variety of downstream applications. In one application, isolated cellulose and polyester molecules are extruded to provide regenerated cellulose fibers and regenerated polyester fibers having desirable (and selectable) properties that are usable in various industrial applications, including textile production.

A process for the production of sinter powder particles (SP), comprising the steps a) providing at least one continuous filament, b) coating, the at least one continuous filament provided in step a) with at least one thermoplastic polymer to obtain a continuous strand comprising the at least one continuous filament, coated with the at least one thermoplastic polymer, wherein the average cross-sectional diameter of the strand is in the range of 10 to 300 pm, and c) size reducing of the continuous strand provided in step b) in order to obtain the sinter powder particles (SP), wherein the average length of the sinter powder particles (SP) is in the range of 10 to 300 pm. The present invention further relates to sinter powder particles (SP) obtained by the process, the use of the sinter powder particles (SP) in a powder-based additive manufacturing process and sinter powder particles (SP) having an essentially cylindrical shape N as well as a process for the production of a shaped body by laser sintering or high-speed sintering of sinter powder particles (SP).

A process for the production of sinter powder particles (SP), comprising the steps a) providing at least one continuous filament, b) coating, the at least one continuous filament provided in step a) with at least one thermoplastic polymer to obtain a continuous strand comprising the at least one continuous filament, coated with the at least one thermoplastic polymer, wherein the average cross-sectional diameter of the strand is in the range of 10 to 300 pm, and c) size reducing of the continuous strand provided in step b) in order to obtain the sinter powder particles (SP), wherein the average length of the sinter powder particles (SP) is in the range of 10 to 300 pm. The present invention further relates to sinter powder particles (SP) obtained by the process, the use of the sinter powder particles (SP) in a powder-based additive manufacturing process and sinter powder particles (SP) having an essentially cylindrical shape N as well as a process for the production of a shaped body by laser sintering or high-speed sintering of sinter powder particles (SP).

A low-shrinkage polyester industrial yarn and a preparation method thereof are provided. The preparation method includes the following steps: subjecting the modified polyester to polycondensation, melting, measuring, extruding, cooling, oiling, stretching, heat setting and winding, wherein the content of the crown ether in the oil agent is 67.30-85.58 wt %. The material of the prepared low shrinkage polyester industrial yarn is a modified polyester, the molecular chain of the modified polyester includes a terephthalic acid segment, an ethylene glycol segment, and a branched diol segment, and the structural formula of the branched diol is as follows: ##STR00001## Wherein R.sub.1 and R.sub.2 are each independently selected from a linear alkylene group having 1-3 carbon atoms, R.sub.3 is selected from an alkyl group having 1-5 carbon atoms, and R.sub.4 is selected from an alkyl group consisting of 2-5 carbon atoms.

A low-shrinkage polyester industrial yarn and a preparation method thereof are provided. The preparation method includes the following steps: subjecting the modified polyester to polycondensation, melting, measuring, extruding, cooling, oiling, stretching, heat setting and winding, wherein the content of the crown ether in the oil agent is 67.30-85.58 wt %. The material of the prepared low shrinkage polyester industrial yarn is a modified polyester, the molecular chain of the modified polyester includes a terephthalic acid segment, an ethylene glycol segment, and a branched diol segment, and the structural formula of the branched diol is as follows: ##STR00001## Wherein R.sub.1 and R.sub.2 are each independently selected from a linear alkylene group having 1-3 carbon atoms, R.sub.3 is selected from an alkyl group having 1-5 carbon atoms, and R.sub.4 is selected from an alkyl group consisting of 2-5 carbon atoms.