Abrasive cloth and process for production thereof
A manufacturing method and technology of abrasive cloth, which is applied in the field of abrasive cloth, can solve the problems of not being able to make sufficient contributions to the reduction of substrate surface roughness or the minimization of scratch defects, and achieve the effect of excellent smoothness and dense surface state
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Embodiment 1
[0108] The melt viscosity is 310 poise (240 ℃, shear rate 121.6 seconds -1 ), a melting point of 220°C N6 (40% by weight) and a weight average molecular weight of 120,000, a melt viscosity of 720 poises (240°C, shear rate 121.6 seconds -1 ), polylactic acid (PLA) (more than 99.5% optical purity) (60% by weight) with a melting point of 170° C. was mixed at 220° C. with a twin-screw extruder to obtain a polymer alloy sheet. Here, the weight average molecular weight of PLA was obtained by the following method. That is, tetrahydrofuran was mixed with a chloroform solution of a sample to prepare a measurement solution, which was measured at 25° C. with Gel Permeation Chromatography (GPC) Waters 2690 manufactured by Waters Corporation, and calculated in terms of polystyrene. The measurement was performed three times for each sample, and the average value was used as the weight average molecular weight.
[0109] Through the spunbonding method, the above-mentioned polymer alloy shee...
Embodiment 2
[0119] The melt viscosity is 1200 poise (262 ℃, shear rate 121.6 seconds -1 ), a melting point of 225°C PBT (20% by weight) with a weight average molecular weight of 120,000 and a melt viscosity of 300 poises (240°C, shear rate 121.6 seconds -1 ), polylactic acid (PLA) (more than 99.5% optical purity) (80% by weight) with a melting point of 170° C. was mixed at 250° C. with a twin-screw extrusion mixer to obtain a polymer alloy sheet.
[0120] Through the spunbond method, the above-mentioned polymer alloy sheet is spun out of the fine hole at a spinning temperature of 250°C, and then spun with an ejector at a spinning speed of 4000m / min, and collected on a moving net conveyor Above, use embossing rollers with a pressing rate of 16% to heat press at a temperature of 90°C and a linear pressure of 20kg / cm to obtain a single fiber with a fineness of 2.0dtex and a weight per unit area of 150g / m 2 long-fiber nonwovens.
[0121] An oil agent (SM7060EX: manufactured by Toray Dowco...
Embodiment 3
[0129] The melt viscosity is 530 poise (262 ℃, shear rate 121.6 seconds -1 ), N6 (20% by weight) with a melting point of 220°C and copolymerized PET (80% by weight) with a melting point of 225°C -1 ), a melting point of isophthalic acid with a melting point of 225° C. and 4 mol% bisphenol A to obtain] mixing at 260° C. with a twin-screw extrusion mixer to obtain a polymer alloy sheet.
[0130] Using this polymer alloy sheet, a 3.2-fold drawn yarn of 120 dtex and 12 filaments was obtained by using the known method described in Example 1 of JP-A-2004-162244.
[0131] The polymer alloy fiber was crimped so that the number of crimps was 14 / 2.54 cm and the cutting length was 51 mm, and cut to obtain a polymer alloy raw cotton. The obtained polymer alloy raw cotton is carded and cross-laid to make a net, and then the needle density is 3000 / cm 2 Implement acupuncture to obtain a weight per unit area of 610g / m 2 A non-woven fabric containing polymer alloy raw cotton.
[0132] Th...
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