The flame retardant yarn is weakly exploded! Ruyi successfully spun 100% fireproof acrylic yarn!

According to functional textiles, fireproof acrylic fiber is a kind of functional fiber with fireproof performance developed after flame retardant acrylic fiber. It is widely used in clothing, home, decoration, non-woven fabric and filling. Wenshang Ruyi Technical Textile Co., Ltd. has carried out technical research and adjustment on the pretreatment and maintenance of this raw material, the process and the temperature and humidity of the production process workshop, solved a series of bottlenecks restricting the normal production, and successfully spun 100% fireproof acrylic yarn. Line, yarn quality and quality have been recognized by customers.

1 raw material characteristics

The average length of the fireproof acrylic fiber is 51mm, but there are long fibers of 70-80mm, the fineness is 1.1dtex, the breaking strength is 2.59cN/dtex, and the elongation is 20.1%. Strength and elongation are reduced to varying degrees compared to conventional acrylic fibers.

2 raw material processing

The moisture regain rate of the raw material is 10.4%, the fiber is more curled, and the hand feels blemish and rough. Before production, antistatic agent and water should be sprayed for health treatment to increase the spinnability. The solution prepared with 15% water and 0.5% antistatic agent is sprayed and placed in the health room for 48 hours. The temperature of the health room is controlled at 30 °C. Left and right, the solution is sprayed layer by layer to ensure uniform adsorption of the fiber, so that the moisture regain rate of the raw material on the machine reaches 15-20%.

3 spinning process

After the health care, the fire-resistant acrylic fiber has been in a state of dehumidification after being put into production. Therefore, it is necessary to pull out a production line before going to the machine. The machine tools of each process are individually circled with the insulation cloth, and the ground water is sprayed and the warm water is sprayed to ensure the humidity of the workshop. High control. Semi-finished products such as lap, sliver, draw, roving, and spun yarn are wrapped in plastic bags in time to minimize water loss.

3.1 open cleaning process

The process of opening the cotton cleaning process adopts the principle of “grasping less and less, playing more and less, combing and reducing the cotton”, appropriately reducing the speed of the needle roller, reducing the spacing of the dust bar, and increasing the needle roller and dust. Bar spacing, to reduce fiber damage, reduce the amount of cotton, open the main process parameters of cotton: the speed of each beater is reduced, the speed of the needle roller is reduced from 650r/min to 550r/min, and the speed of catching cotton is 720r/min. The pressure is reduced to 650r/min, the pressure of the compacting roller is increased, and the hanging spindle is installed above the winding machine, and the roving strip is wound synchronously with the lap to facilitate the delamination of the lap to prevent sticking during unwinding. Control the stock of laps, all the spare rolls are covered with plastic bags to prevent water loss.

3.2 Carding process

The carding process adopts the principle of “reducing the impact and combing moderately”. Appropriately adjust the tin-stab ratio of the cylinder and the thorn stick, appropriately reduce the rotation speed of the licker roller, enlarge the spacing between the licker roller and the cotton feed plate to reduce the fiber damage; appropriately reduce the spacing between the cover plate and the cylinder to strengthen the combing of the fiber, Appropriately reduce the stripping speed to 50m/min, and the sliver weight is 20.5g/5m. The carding machine is separately isolated and humidified, and the relative humidity is adjusted from 55-60% to 60-70%. The measured quality index of raw strips: weight unevenness rate 4.0%, strip dry CV value 5.5%, sliver knot number 1 grain / g.

3.3 parallel process

The stripping (JWF1312A) gauge is adjusted to 17*27mm, and all the leather rollers are treated with antistatic agent coating to reduce the sticking phenomenon caused by static electricity. The rubber roller with good anti-winding properties of suitable spinning and chemical fiber is selected. No. fixed supply draw frame machine eye number, cans cross use. The machine adopts isolation and humidification. When the machine is changed in front of the machine, the plastic bag is placed in the can, and the bag is moisturized after the full tube. The relative humidity is guaranteed to be about 70%, and the vehicle speed is appropriately lowered, and the amount is 19.5g/5m. The measured quality index of cooked strips: weight unevenness rate 1.2%, strip dry CV value 3.8%

3.4 roving process

The machine is completely isolated and humidified by the nozzle. Under the premise of ensuring that the roving is not disjointed, the roving twist is reduced as much as possible to reduce the phenomenon that the spun yarn is not stretched. The roving process adheres to the principle of “medium-quantity, medium-pressure, medium-spindle speed and partial-roller gauge”; control the tension and elongation of large and medium-sized yarns; select the rubber roller with good resistance to spinning and chemical fiber, and the surface of rubber roller Antistatic agent coating treatment; roving (FA1435) gauge is 16*30*32mm, quantitative 5.0g/10m. Measured roving quality indicators: weight unevenness rate of 1.0%, strip dry CV value of 4.5%.

3.5 Spinning process

The relative humidity is adjusted from 53-58% to 60-65%, preferably the draw ratio in the back zone is 1.6, the medium roll is pressed, the larger back zone roller gauge, the lower spindle speed, the front roll 3mm front punching, 13mm length of floating area; rubber roller with good hardness of 72 degree and good anti-winding properties, rubber roller surface treated with antistatic agent; suitable for spinning, anti-winding, high wear-resistant rubber ring; The spacer block is increased by the conventional model number one. Measured tube quality index: 32Ne/1, weight unevenness rate 1.8%, strip dry CV value 14.0%, (-50%) detail 0 / km, (+50%) thick section 20 / km, (+200%) Neps 35/km.

3.6 winding process

After the lower machine, the bobbin is wound up in time, and the process principle of 'medium speed and medium tension is adopted, and the clearing process parameters are reasonably set to remove harmful defects. Ensure the consistency of process parameters of the same variety and different machines; the ratio of the strength of the open space to the strength of the original yarn is greater than 80%; the requirement of the good rate on the machine is 99% and above; the quality of the measured yarn is 32S/1, the weight is not The uniformity is 1.5%, the dry CV value is 14.8%, (-50%) details are 1/km, (+50%) thick sections are 22/km, (+200%) neps 38/km.. strong 230.5cN.

4 conclusion

Through the production practice of spinning medium-long fiber fire-retardant acrylic fiber on cotton spinning equipment, the processing of raw materials and the temperature and humidity of each process are the key. The raw materials should be promptly advanced after being put on the machine. The semi-finished products prevent water loss and reduce the influence of static electricity to ensure its Spinnability.