Abstract:
Una tela abrasiva que comprende un material en forma de lámina que tiene al menos en su parte de las nanofibras hechas de un polímero termoplástico, teniendo las nanofibras un número medio de finura de fibra única de 1 x 10 -8 a 4 x 10 -4 dtex, caracterizado en que la suma de relaciones de finura de finuras de fibra única en el rango de 1 x 10 -8 a 4 x 10 -4 dtex de 60% o más, en donde el esfuerzo al 10% de elongación en una dirección longitudinal está en el rango de 5 a 200 N/cm de ancho.
Abstract:
A SOFT STRETCH YARN SUBSTANTIALLY COMPRISING POLYESTER FIBRES HAS A STRESS, AT 50% YARN STRETCH,OF NO MORE THAN 30 X 10¯³ CN/DTEX AND, AT THE SAME TIME, A PERCENTAGE RECOVERY OF AT LEAST 60% PREFERABLY, THE USTER UNEVENNESS IS NO MORE THAN 2.0% AND THE CRIMP DIAMETER IS NO MORE THAN 250 µM. THIS SOFT STRETCH YARN CAN BE PRODUCED BY SPINNING YARN OF CONJUGATE FIBRES COMPRISING TWO TYPES OF POLYESTER IN WHICH ONE COMPONENT IS PTT AT A TAKE-UP VELOCITY OF AT LEAST 1200 M/MIN, DRAWING AT A DRAWING TEMPERATURE OF 50 TO 80ºC AT A DRAW RATIO SUCH THAT THE DRAWN YARN TENSILE ELONGATION IS 20 TO 45%, AND THEN HEAT SETTING.(FIG 1)
Abstract:
A soft stretch yarn substantially comprising polyester fibres has a stress, at 50% yarn stretch, of no more than 30x10 cN/dtex and, at the same time, a percentage recovery of at least 60%. Preferably, the Uster unevenness is no more than 2.0% and the crimp diameter is no more than 250 mu m. This soft stretch yarn can be produced by spinning yarn of conjugate fibres comprising two types of polyester in which one component is PTT at a take-up velocity of at least 1200 m/min, drawing at a drawing temperature of 50 to 80 DEG C at a draw ratio such that the drawn yarn tensile elongation is 20 to 45%, and then heat setting.
Abstract:
An abrasive cloth which comprises an article in a sheet form having, in at least a part thereof, nano-fibers comprising a thermoplastic polymer and having a number average single fiber fineness of 1 .times. 10-8 to 2 .times. 10-4 dtex wherein the sum of single fiber fineness percentages (which is defined in the specification) of a single fiber fineness of 1 .times. 10-8 t o 2 .times. 10-4 dtex is the range of 60 % or more, and exhibits a stress at 1 0 % elongation in a longitudinal direction of 5 to 200 N/cm-width; and a metho d for preparing a nano-fiber structure, which comprises providing a nano-fiber dispersion having a dispersant and, dispersed therein, nano-fibers comprisin g a thermoplastic polymer and having a number average diameter of 1 to 500 nm, attaching the dispersion to a support, and then removing said dispersant. Th e above abrasive cloth is excellent in polishing characteristics, and the abov e method allows the preparation of a nano-fiber structure wherein nano-fibers form a composite with the support.
Abstract:
Polylactic acid fibers excellent in wearing resistance and in the ability to smoothly pass through processing steps. The polylactic acid fibers contain a fatty acid bisamide and/or an alkyl-substituted fatty acid monoamide in an amount of 0.1 to 5 wt.% based on the whole fibers.
Abstract:
Disclosed is a recyclable light-reflecting sheet which is excellent in light-reflecting characteristics even it is formed thin. This light-reflecting sheet contributes to weight reduction of a display. Specifically disclosed is a light-reflecting sheet which is composed of a sheet containing single fibers having a number average diameter of 1-1000 nm and has a light reflectance at a wavelength of 560 nm of not less than 95%.
Abstract:
The invention provides an aggregate of nanofibers which is not limited in shape or material polymer, is widely applicable and developable, and has a small dispersion of single fiber fineness, and a process for the production thereof. The invention relates to an aggregate of nanofibers which have a number-average single fiber fineness of 1 x 10 to 2 x 10 dtex and a proportion of single fibers having single fiber fineness ranging from 1 x 10 to 2 x 10 dtex of 60 % or above and which are made of a thermoplastic polymer.