KR960705105A - Papermaking machine dryer fabric - Google Patents

Abstract

The present invention relates to a papermaking machine dryer fabric, wherein at least a portion of the component yarns are composed of an effective amount of copolymer and hydrolysis stabilizer of 1, 4-dimethylolcyclohexane, terephthalic acid and isophthalic acid. In the present invention, the molar ratio of terephthalic acid to isophthalic acid used to prepare the copolymer is about 83:17, and the copolymer has an intrinsic viscosity of greater than 0 / .75 dL / g. Compared to other known polymers used in dryer fabrics, these copolymers improve the resistance to hydrolytic degradation in monofilaments and impart good nodular properties.

Selective addition of low density polyethylene to the copolymer can increase antifouling to surface contamination and dirt.

Description

Papermaking machine dryer fabric

Since this is an open matter, no full text was included.

FIG. 1 shows the percentage of tensile strength retained relative to monofilaments in Table 2.

2 shows the effect of the PCDI stabilizer on the tensile strength of the monofilament samples in Table 2,

3 shows the relationship between nodular elongation and thermal contraction.

Claims (25)

A papermaking machine driver fabric, wherein at least a portion of the yarn is a monofilament consisting of a copolymer of 1, 4-dimethylolcyclohexane, terephthalic acid isophthalic acid, wherein the monofilament; i) the molar ratio of terephthalic acid to isophthalic acid in the copolymer is about 83:17, and ii) the intrinsic viscosity of the copolymer in 60:40 weight ratio of phenol and 1,1,2,2-tetrachloroethane at 30 ° C. Rupture of a monofilament sample larger than 0.75 dL / g, as measured by ASTM standard method D-4603-86, iii) the copolymer contains an effective amount of a hydrolysis stabilizer, and iii) nodules formed with a simple single knot. Papermaking machine dryer fabric, exhibiting at least about 10% nodular elongation when measured, and iii) thermal contraction of monofilament at 200 ° C. is at least about 1%. The fabric of claim 1 wherein the high oil viscosity of the copolymer is about 0.75 to 1.5 dL / g. The fabric of claim 1 wherein the amount of stabilizer contained in the copolymer is from about 0.4 to 5 weight percent. The fabric of claim 1, wherein the thermal contraction is about 1,5 to 10% and the nodule stretch is at least about 10%. The fabric of claim 4 wherein the thermal shrinkage is about 3 to 5%. 6. The fabric of claim 5 wherein the thermal shrinkage is about 4%. The fabric of claim 1, wherein the woven monofilament is woven to form a fabric. The fabric of claim 1, wherein the fabric is a combination formed from a coil and a hinge yarn composed of a copolymer. A papermaking dryer fabric, wherein at least a portion of the yarn is a monofilament consisting of a mixture of a copolymer of 1, 4-dimethyloxcyclohexane, terephthalic acid and isophthalic acid and an effective amount of low density polyethylene, wherein said monofilament; Iii) the molar ratio of terephthalic acid to isophthalic acid in the pocolimer is about 83:17, and ii) the intrinsic viscosity of the copolymer is 60:40 weight ratio of phenol and 1,1,2,2-tetrachloroethane at 30 ° C. (I) greater than 0.75 dL / g, as measured by ASTM standard method D-4603-86, iii) a copolymer comprising an effective amount of a hydrolytic stabilizer, iii) a nodular monofilament sample formed with a simple single knot. A papermaking machine dryer fabric having a nodule elongation of at least about 10% as measured by elongation at break, and i) a thermal shrinkage of monofilament at 200 ° C. at least about 1%. 10. The fabric of claim 9 comprising about 0.5 to 15 weight percent polyethylene. The fabric of claim 10 comprising from about 1 to 7 weight percent polyethylene. 10. The fabric of claim 9 wherein the copolymer has an inherent viscosity of about 0.75 to 1.5 dL / g. 10. The fabric of claim 9 wherein the amount of stabilizer contained in the copolymer is from about 0.4 to 5 weight percent. The fabric of claim 9 wherein the thermal contraction is about 1.5 to 10% and the nodule stretch is at least about 10%. 15. The fabric of claim 14 wherein the thermal shrinkage is about 3 to 5%. The fabric of claim 15 wherein the thermal contraction is about 4%. 10. The fabric of claim 9, wherein the woven monofilament is woven to form a fabric. 10. The fabric of claim 9, wherein the fabric is formed from a coil and a hinge yarn consisting of a copolymer. A monofilament comprising an effective amount of a mixture of 1, 4-dimethyloxcyclohexane, terephthalic acid and isophthalic acid and an effective amount of low density polyethylene effective to improve the nodular properties of the fiber, wherein said monofilament is in said monofilament; Iii) the molar ratio of terephthalic acid to isophthalic acid in the copolymer is about 83:17, and ii) the intrinsic viscosity of the copolymer in 60:40 weight ratio phenol and 1,1,2,2-tetrachloroethane at 30 ° C. Rupture of a monofilament sample larger than 0.75 dL / g, as measured by ASTM standard method D-4603-86, iii) the copolymer contains an effective amount of a hydrolysis stabilizer, and iii) nodules formed with a simple single knot. When measured by elongation at time, exhibiting at least about 10% nodular elongation, and iii) monofilaments having a thermal contraction of at least about 1% of the monofilament at 200 ° C. 20. The monofilament of claim 19 comprising about 0.5 to 15 weight percent polyethylene. 20. The monofilament of claim 19 comprising about 1 to 7 weight percent polyethylene. 20. The monofilament of claim 19 wherein the copolymer has an intrinsic viscosity of about 0.75 to 1.5 dL / g. 20. The monofilament of claim 19 wherein the amount of stabilizer contained in the copolymer is from about 0.4 to about 5 weight percent. 20. The monofilament of claim 19 which is a spun yarn, multifilament yarn or braided yarn. Spun yarn, multifilament yarn or braid comprising a portion of the monofilament according to claim 19. ※ Note: The disclosure is based on the initial application.