50results about How to "Low boiling water shrinkage" patented technology

The invention relates to a self-enhanced polylactic acid fiber and a preparation method thereof. The self-enhanced polylactic acid fiber provided by the invention is a uniform mixture of a vertical compound crystal polylactic acid micro-fiber and a polylactic acid substrate. In 100 weight parts of self-enhanced polylactic acid fiber, 1-30 parts of vertical compound crystal polylactic acid micro-fiber and 70-99 parts of polylactic acid substrate are contained. The preparation method of the fiber comprises the following steps: firstly, respectively carrying out vacuum drying on PLLA (poly L lactic acid) and PDLA (poly D lactic acid); physically mixing PLLA with PDLA after being dried; fusing the mixture; collecting primary fibers under the conditions that a spinning temperature is 225-245 DEG C and a spinning speed is 500-2500 meters per minute; and thermally drafting and thermally shaping the primary fibers. Compared with the common polylactic acid fiber, the self-enhanced polylactic acid fiber disclosed by the invention has the advantages of higher constant temperature mechanical strength, higher high temperature mechanical strength and lower boiling water shrinkage, so that the use demand is met and the application field is expanded.

The present invention relates to Dacron producing process, and is especially preparation process of high-strength and low-elongation Dacron filament for sewing thread. The preparation process with routine pre-oriented POY filament includes successive first high-power drafting in the first and the second heating discs, high temperature tensed heat setting in the first heating box and the third heating box, the second drafting and the high temperature relax heat setting in the second heating box. In the process, POY filament has good drafting performance, no teasing and breaking, and the final product has high strength, low elongation and less heat shrinkage.

The invention discloses a textured yarn and a processing method, special device and applications thereof. The textured yarn has lower cross-section deformability and boiling water shrinkage. The processing method is to use the special device to disturb the number of turns of the yarns in a thermosetting box in the twisting area of a texturing device to obtain the textured yarn characterized by low elastic recovery rate and cross-section deformability. The textured yarn prepared by the method fills the gap of low crimp textured yarn between the draw yarn and the low stretch yarn, the processed yarn is characterized by low cross-section deformability, smoothness and good luster and the processing method of the invention is especially suitable to process the tri-differential filament with irregular section which has low cross-section deformability to maintain the cut surface characteristic of the yarn. The processed yarn not only has a certain inherent crimp characteristic of the textured yarn, but also the low cross-section deformability characteristic of the draw yarn, thus expanding the process range of the existing texturing device.

The invention provides a processing method of fine denier, high-strength and low-shrinkage polyester filament. The method uses the ordinary POY polyester pre-oriented silk as pre-processing raw materials which is obtained in spinning speed of 2500 - 3300m/min and in the condition of need not be increased control-cooling, improves the prior dual-heat-discs horizontal traction machine, adjusts the design of traction technology, processes consecutively through several procedures of first level drafting, one-shot relaxed heat forming and rolling to control the drafting temperature, drafting magnification and shaping relaxation rate accurately, then produces fine denier, high-strength and low-shrinkage polyester filament which denier is 30D-200D. The strength of products can reach 8.0 +- 0.5g / d (7.0 +- 0.4cN/dtex), the broken elongation is 14.0% +- 3.0% and the boiling-water shrinkage ratio is below 2.0%, it meets the requirements of producing high and middle grade polyester filament sewing thread.

The invention relates to a fully drawn polyester fiber and a preparation method thereof. The technical problem to be solved by the method is to improve the size stability of polyester FDY products and widely apply the polyester FDY products in the weaving field with high size stability requirement. The boiling water shrinkage of the fiber is between 2.0 and 5.0. The method mainly comprises the following steps: firstly, a heat pipe (2) provided with a heating medium for heating is arranged under a spinneret plate of a spinning component (1) of equipment for producing FDY through the hot-roller method; and secondly, a nascent fiber spun from the spinneret plate (1) is cooled and directly added into the heat pipe (2), passes through an oil tanker (3) and then through two or two groups of hot rollers (4) and (5), enters into a network nozzle (6), and finally is wound into an FDY wire cylinder (7).

The invention relates to a colored special-shaped size-stabilized type polyester monofilament and a preparation method thereof. The colored special-shaped size-stabilized type polyester monofilament is composed of, by weight, 84.5 parts to 99.75 parts of polyethylene terephthalate (PET), 0.2 part to 5 parts of color master batches, 0.1 part to 10 parts of poly(ethylene 2,6-naphthalate) (PEN) and 0.05 part to 1 part of barium sulfate powder. By adding the PEN, the thermal resistance of fiber is improved, and no roller sticking phenomenon can occur even when the heat setting temperature is above 245 DEG C; nanometer barium sulfate plays a role of plasticizer, the slippage among high polymers is improved, the drawing ratio is increased, the fiber contraction rate is decreased, and meanwhile the colored fiber can be more uniform and brighter in color and luster; the high drawing ratio is achieved in the fiber drawing process, induced crystallization produced in the fiber drawing process is improved, and the boiling water shrinkage is decreased; the fiber preparing process is simple, dry strands are uniform, fiber is uniform in thickness, woven fabric is smooth, grids are exquisite and uniform, and a colored special-shaped filament is softer and richer in color so that stylized reflection can be facilitated.

The invention belongs to the chemical fiber manufacturing field, and particularly relates to a production method of a spunbonded viscose polyester embroidery thread. The production method comprises the following steps: preparing bright modified polyester; carrying out melt spinning, drawing and winding to obtain modified polyester drawn yarns according to the characteristics of the bright modified polyester; and twisting the modified polyester drawn yarns, and dyeing the yarns to obtain the colored polyester embroidery thread product. The invention further provides the colored polyester embroidery thread prepared by the production method. The colored polyester embroidery thread is bright polyester fibers with a triangular cross section, and has bright color; the obtained embroidery thread has the advantages of complete color spectrum, rich color and higher color fastness, and is not darkened after being washed; and meanwhile the embroidered pattern is not deformed due to low boiling water shrinkage and stable structure.

The invention relates to polyester fully drawn yarn FDY and a production method thereof, and in particular to low-shrink polyester fully drawn yarn FDY and production method thereof. The technical problem to be solved is as follows: oiling through a posterior drawing and sizing oil nozzle or pre-oiling through an oil wheel, and oiling through the posterior drawing and sizing oil nozzle to the necessary value to realize high-temperature high-drawing and high-temperature thermal-sizing so as to produce shrink polyester FDY; the size of the textile is stable, so that the textile can be used on blanket home textile and in the industrial field; meanwhile, the invention is used for solving the problems of severe fuming of oil, production environment affect and industrialization difficulty caused by high-temperature production. The important steps of the method comprise: coating nanometer nickel-cadmium-chromium alloy on the surfaces of a first hot holler and a second hot roller and yarn guiders used by the same to reduce the friction coefficient to be smaller than 0.1, directly oiling through the posterior drawing and sizing oil nozzle or pre-oiling through the oil wheel, and oiling to the necessary value through the oil nozzle after the drawing and sizing procedures.

The invention relates to a polyacrylonitrile fiber, and concretely relates to a high temperature-resistant flame retardation polyacrylonitrile fiber and a production method thereof. The method concretely comprises the following steps: processing a polyacrylonitrile fiber in a hydrazine solution with the concentration of 7-20wt%, processing the hydrazine processed fiber in an alkaline solution with the concentration of 3-10wt%, washing the alkali processed fiber with water until the fiber is neutral, processing the neutral fiber in an aqueous metal ion salt solution with the concentration of 3-10wt%, oiling the metal salt processed fiber, dehydrating the oiled fiber, and drying the dehydrated fiber to obtain the high temperature-resistant flame retardation polyacrylonitrile fiber. The flame retardation performance LOI of the flame retardation fiber obtained in the invention can reach 40-45, the flame retardation grade is M1, and the amount of smoke generated in the combustion process is very small, the grade of toxic gases is FO, and the smoke amount of the flame retardation fiber in the invention is lower than that of other flame retardation fibers. The flame retardation fiber in the invention has the advantages of high moisture regain rate, high water absorption rate, good dyeability and low shrinkage in boiling water.

The invention relates to colored special-shaped super fine denier polyester monofilaments and a production method thereof. The colored special-shaped super fine denier polyester monofilaments are prepared from, by mass, 1-5% of anti-aging capsules, 5-10% of pigment, 5-10% of PEN slices, 1-3% of a dispersing agent and the balance polyester slices. The PEN slices, the polyester slices, the anti-aging capsules, the pigment and the dispersing agent are extruded and mixed together through a screw machine and then melted, melt is prepared and subjected to melt spinning through a special-shaped spinneret plate, and the colored special-shaped super fine denier polyester monofilaments are obtained. Due to the fact that PEN is added, the heat resistance of fibers is improved, and thus the roll sticking phenomenon is avoided when the heat setting temperature is higher than 245 DEG C; meanwhile, due to the higher heat setting temperature, disorientation of an orientation structure of an amorphous area is accelerated, the internal stress of the fibers is reduced, and thus the dimension stability of the fibers is improved; the setting temperature is raised, the mobility of macromolecular chains in the fiber structure is enhanced, the degree of crystallinity is increased, the content of an amorphous area is reduced, and the boiling water shrinkage is reduced.

A process for preparing the polyester used to spin high-gloss hot-tube drawn silk features the semi-continuous direct esterifying process is used, and the nucleator (SiO2 superfine particles) is used in condensatino step for high crystallizing degree. The resultant polyester is used to prepare the high-glass silk by the hot tube drawing technique. Its advantages are high fracture strength, low shrinkage in boiling water, and good hand feeling and uniform dyeing of its fabric.

The invention relates to a manufacture technology of a high stretching bright polyester filament which is a bright polyester filament product manufactured by adopting a common chip spinning manufacture flow with a micro-injection method to add a special aether additive in a melt through a special technique. The high stretching bright polyester filament manufactured by the method has the qualities of normal intensity, more than 40 percent of crack stretching rate, low boiling water shrinkage factor and few broken filament end cracking; besides, the manufacture operation is more stable. As a common terylene high speed spinning technique line is adopted, the invention has low requirements on the device; the output is high, the additive value of the product is high, the investment cost can be reduced and the economic benefit can be improved.

The invention relates to the technical field of fiber preparation, and particularly relates to a production method of black antibacterial low-shrinkage FDY fibers. An optical polyester melt is used asa raw material, and the optical polyester melt is pressurized by a booster pump through a melt conveying pipeline and then enters a melt cooler; after the melt is cooled by using the melt cooler, black antibacterial master batches are added online, and are fed into a spinning box body after passing through a dynamic mixer; after being metered by a metering pump, the mixture is filtered by the spinning assembly in the spinning box body and then is extruded; after the spinning is cooled by a side air blowing process, the fibers enter a winding oil wheel for being subjected to oiling, pre-networking, hot roller heating process and a main network; and next, the fibers are subjected to supplemental heat setting through a rear heating plate device, and finally the fibers are rolled and formed through an ACW winding head. According to the production method of the black antibacterial low-shrinkage FDY fibers, the product has high antibacterial performance, and meanwhile, the boiling water shrinkage rate of the product is reduced from 5% to about 2.5%. The product is suitable for novel fields such as suede fabric, fiber blending and the like.