51results about How to "Increase draft ratio" patented technology

The invention relates to a curing treatment method of a carbon fiber precursor polyacrylonitrile fiber. The method comprises the following steps: pre-cyclizing the polyacrylonitrile fiber precursor in the atmosphere of inert gas; carrying out cyclizing and plastic drawing in the atmosphere of inert gas and water vapor; and carrying out oxidation crosslinking in the atmosphere of air, thus obtaining a pre-oxidized polyacrylonitrile fiber. The method has the following beneficial effects: carrying out heat treatment on the fiber in the inert atmosphere is beneficial to implementation of cyclization reaction in the molecules to form rigid ladderlike molecules with regular structure and strong heat resistance, and at the same time, a defined amount of water vapor is introduced to obtain a higher drawing ratio by enhancing the plasticity of the molecular chains in the fiber, thus improving the orientation degree of the rigid molecules along the fiber axis.

The invention provides a method for producing fine chinlon 6 fully drawn yarn with high strength which includes steps as follows: (1) chinlon 6 slice enters into a screw extruder with electrical heating function through a storage hopper that makes slice showing melt shape; (2) the melt material is pressed in a spinning subassembly through a metering pump quantificationally, and is spout by a spout plate for forming filament bundle in a spining box body; (3) the filament bundle is cooled by side wind through the spinning box body and is cooled further through a corridor; (4) the cooled filament bundle is oiled by an oil roll; (5) oil in the filament bundle is more uniform and has high amplexus degree through confounding; (6) the filament bundle passes through a first group filament guide roll and a second group filament guide roll for drafting forming, then passes through a third filament guide roll to reel. A grade product produced by the method has average more than or equal to 6.0cN/dtex rupture strength that is higher 22% than the product produced by normal method, and has better transparent sense and visual effect, the produced clothes has better flexible sense and handle sense for wearing cosily.

The invention provides a modified polyphenylene sulfide fiber and process for preparing, whose components and parts by weight comprise 100 parts of polyphenylene sulfide and 0.2-2 parts of nano-silica whose surface is treated, the particle size of the silica is 20-60 nanometer, and the denier of the fiber is 85-91 dtax. The invention prepares the polyphenylene sulfide fiber through modifying polyphenylene sulfide resins and using special spinning process, the fiber strength and tension toughness are all improved, simultaneously, the glossiness of the fiber is further improved, the spinning is capable of being done by a common spinning device, the cost of spinning is reduced, the fluidity of substrate is changed better during spinning, the temperature of spinning is reduced by 5-10 DGE C, the draft multiple of as-spun fiber is improved, and the mechanical properties of the fiber are capable of being improved.

A preparation method for wet acrylic fiber is characterized by including the following steps in turn: a, spinning and shaping; b, washing and drafting; c, oiling; d, drying; e, winding; f, shaping. Furthermore, compared with the prior art, the invention makes improvement on the shaping technique and post treatment technique through the specific design of a silk spray plate and selects proper spinning, shaping and post treatment condition technique parameters through a plurality of tests to improve the coagulation bath circulation amount, improve the adding amount and the drafting times of an oil agent and improve the winding door pressure. The acrylic fiber manufactured by the invention improves the shaping effect of the fiber.

The invention relates to high-strength low-contract polyphenylene sulfide (PPS) filament and a preparation method thereof. In the high-strength low-contract PPS filament, monofilament line density is 2-4 dtex, breaking strength is 4-6 cN/dtex, elongation at break is 15-20%, and dry heat contractibility rate (processing the filament for 30min at the temperature of 180 DEG C) is less than 5%. The preparation method includes drying and crystallizing PPS slices, melt-extruding, spinning, cooling, applying oil, and winding preliminarily; then adopting level 1 to level 3 drafting to obtain draft filament; and conducting heat setting processing on the draft filament, and obtaining the high-strength low-contract PPS filament, wherein the heat setting processing includes two steps of dynamic heat setting and static heat setting. The high-strength low-contract PPS filament fiber is high in manufacture yielding rate, even in fiber fineness and good in breaking strength, elongation at break, boiling water shrinkage and dry heat contractibility and is far better in comprehensive performance than the existing PPS filament products in the market.

The invention relates to a method for processing a small-specification blending modified polypropylene light-emitting rope for fishing, belonging to the method for processing the light-emitting rope for fishing and needing providing a method for processing the small-specification blending modified polypropylene light-emitting rope for fishing. The small-specification blending modified polypropylene light-emitting rope for fishing is processed by adopting the raw materials of PP resin, HDPE resin, light-emitting powder and assistant. The method is characterized in that a mixture of the PP resin, the light-emitting powder, zinc stearate and white oil is extruded and pelleted to obtain a blending material matrix; a mixture of the blending material matrix, the PP resin and the HDPE resin is melted and extruded by an extruding machine, a raw silk obtained through melting and extruding is cooled and pre-drafted, and a pre-drafted silk is subjected to two times of thermal drafting and then cooled with airflow; the single silk bundle is split into a blending modified polypropylene light-emitting silk for fishing, 36 light-emitting silks are twisted to a Z-direction light-emitting rope yarn, 6 Z-direction light-emitting rope yarns are manufactured into an S-direction rope yarn, and 3 S-direction light-emitting rope yarns are twisted into a small-specification blending modified polypropylene light-emitting rope for fishing in a Z direction. The invention is used for the light-emitting rope for fishing.

The invention provides an oxidized graphene dry-jetting and wet-spinning method. The oxidized graphene dry-jetting and wet-spinning method is characterized in that an improved Hummers method is adopted to prepare oxidized graphene, an oxidized graphenespinning solution is prepared after washing and is extruded out of a capillary spinning tube and enters a coagulating bath through an air layer to solidify, colloid fiber is obtained, and graphene fiber is prepared through reduction after drying. The graphene slice layer screening process can be omitted, industrial production is promoted, the draft multiple of the colloid fiber can be improved through the air layer by adopting the oxidized graphene dry-jetting and wet-spinning method, the orientation of the slice layer in the fiber is improved, and the fiber strength is improved.

The invention discloses a method for preparing cellulose fibers by dry-wet spinning. The method comprises the following steps: dissolving cellulose fibers in phosphoric acid/polyphosphoric acid compound solution and preparing the original liquid glue in the liquid crystal state by using a double-screw extruder; preheating the original liquid glue and then feeding to a metering pump; adjusting glue feeding quantity; spraying out the original liquid glue through a spinneret plate; allowing the original liquid glue to be subjected to air bath, first coagulating bath and second coagulating bath successively, wherein the air gap is 3-50mm and a solution comprising three components is used in each of the first coagulating bath and the second coagulating bath; carrying out water washing, neutralization, hot water washing, oil applying, drying, winding and the like to prepare the finished fire. The method is characterized in that filament spinning and forming time is short; filaments are formed quite uniformed; production efficiency is high, the fiber index is excellent and the like; no by-product is generated; the environment is less polluted; and cost is low.

The invention provides a copolyamide industrial yarn and a preparation method thereof. The copolyamide industrial yarn is prepared by polymerizing raw materials including a monomer, the monomer includes 1, 5-pentanediamine, a first dibasic acid and a second dibasic acid, wherein the first dibasic acid is terephthalic acid; the preparation method of the copolyamide industrial yarn comprises the following steps: 1) preparing the raw materials into a mixed solution; 2) polymerizing, granulating and solid-phase-tackifying the mixed solution to obtain tackifying copolyamide resin, and heating and melting the tackifying copolyamide resin to obtain tackifying copolyamide melt; 3) spinning the tackified copolyamide melt to obtain virgin yarn; 4) carrying out cooling, oiling, stretching and windingforming on the virgin silk to obtain the copolyamide industrial yarn. The copolyamide industrial yarn has good high temperature resistance and thermal stability.

The invention discloses a continuous terylene BCF (Bulk Continuous Filament) spinning machine which belongs to the technical field of chemical fiber spinning equipment. The continuous terylene BCF spinning machine comprises a material dryer, a material absorbing device, a metering device, a material mixing hopper, a screw extruder, a diphenyl furnace, a spinneret plate with trilobal or Y-shaped spinneret micropores, a lateral air blowing device, a spinning channel and a tensile strain winder, wherein the tensile strain winder comprises primary tension devices, and each primary tension device comprises a feeding heat roller and two traction heat rollers; and the continuous terylene BCF spinning machine is characterized in that the material dryer comprises a feeding hopper, a crystallization bed, a drying tank and a storage hopper which are connected through material delivering pipes; the material mixing hopper is communicated with a nitrogen device or a steel nitrogen cylinder; the front section of a screw of the screw extruder is a mixing head provided with a plurality of round nails; and the tensile strain winder comprises a secondary tension device behind or between the primary tension device. The continuous terylene BCF spinning machine can spin a high-quality terylene BCF used for carpet suede materials, which has soft hand feel, high strength, good elasticity, good bulkiness and good spinnability, can be printed and dyed, and is dyed in the mass.

This invention relates to a drafting system and a control method for roving machines, in which the drafting system includes a four roller drafting pattern, a four roller double-zone double apron drafting pattern, the four lines of lower rollers contain the following from the front to back: the first includes a metal groove roller, the second includes a metal knurling roller, the third is metal knurling roller and the fourth includes a metal groove roller, the four lines of upper rollers are: the first one is a roller cladding spring materials, the second is a metal apron roller or an apron upper roller cladding spring materials, the third one is a metal apron upper roller or an apron upper roller cladding spring materials and the fourth one is a belt roller cladding spring materials. The control method includes: double -apron low times of drafting is done for the front region, 2.5-10 times of double-apron middle times of drafting for the middle region and 1.1-2 times of low drafting for the back region.

The invention discloses a method for controlling twist redistribution. According to the invention, a back zone force application method is adiopted to apply external force on a strip located in a drawing back zone, a force application point is located on the strip surface of the drawing back zone, component force is produced by the applied external force in a vertical direction of the strip surface of the drawing back zone, a stable frictional force zone is provided for the position of the force application point, the strip is not easy to turn over, simultaneously, compactness of the strip can be effectively improved, twist redistribution can be effectively avoided, and resultant yarn levelness is improved.

The invention relates to polyacrylonitrile fibers and a wet spinning method thereof. According to the main technical scheme, the wet spinning method of the polyacrylonitrile fibers comprises the following steps: spinning: extruding a spinning solution through a spinning hole of a spinning assembly to obtain a spinning fine flow; solidifying and forming: enabling the spinning fine flow to enter a coagulation bath for coagulation forming to obtain nascent fibers; hot drafting treatment: carrying out multi-stage thermal drafting treatment on the nascent fibers; washing: washing the fibers subjected to hot drafting treatment; and drying and heat setting treatment: sequentially drying and heat-setting the washed fibers to obtain the polyacrylonitrile fibers. The polyacrylonitrile fibers are prepared by the wet spinning method of the polyacrylonitrile fibers. The polyacrylonitrile fibers are mainly used for ensuring the spinnability of the spinning solution in the spinning process, and the mechanical property of polyacrylonitrile fibers is improved.

The invention discloses a processing process of high-strength high-stretchability chinlon industrial yarn. The processing process includes the following steps of 1, preparation of a spinning solution; 2, spinning forming; 3, cooling; 4, drafting setting, wherein drafting setting is carried out on primary cellosilk beams, three-level hot drafting is adopted for drafting, the first-level hot drafting multiple ranges from 2 to 2.1, the second-level hot drafting multiple ranges from 1.8 to 1.9, the third-level hot drafting multiple ranges from 1.5 to 1.7, and tension hot setting is adopted for setting; 5, winding. In this way, the process is simple and easy to control, and the prepared chinlon industrial yarn is high in breaking strength and low in dry heat shrinkage rate, further has the advantages of being excellent in abrasion resistance, fatigue resistance, impact resistance and the like, and can meet the requirements of safety air bag materials.

The invention provides an automatic bar breaking device of a drawing frame and a bar breaking device using the device and belongs to the technical field of spinning machinery, and particularly relates to the automatic bar breaking device of the drawing frame and the bar breaking device using the device. The automatic bar breaking device of the drawing frame, provided by the invention, has a simple structure, can be used for accurately breaking bars, does not have a condition of automatically operating when the bars are not broken and has high reliability. The automatic bar breaking device comprises a machine case, wherein a first roller connected with a main motor is arranged on the upper side in the machine case; a bar silo is arranged on the lower side in the machine case; a creel changing motor is arranged at the bottom of the machine case; and a guide roller is arranged at the part, corresponding to the bar silo, on the upper side in the machine case. The automatic bar breaking device of the drawing frame is characterized in that a roller set connected with a servo motor is arranged at the part corresponding to the first roller; a cotton bar feeding speed sensor is arranged at the part, corresponding to a feeding hole of the machine case, in the machine case; and a cotton bar output speed sensor is arranged at the part, corresponding to the guide roller, in the machine case.

The invention relates to a super-high-draft device which comprises a front roller, a middle roller, a rear roller, a pressure bar, a bell mouth and leather collars, and is characterized in that a pressure bar is additionally mounted in a rear zone of the conventional draft device and the leather collar is additionally mounted on the rear roller, so that the friction field of the rear zone is increased, and control of floating fibers in the rear draft zone is strengthened. Harmful feathers are reduced, and the draft multiple is improved.