Far infrared polypropylene
Far infrared polypropylene
0Foreword
Natural colored cotton is a variant of cotton whose fibers are naturally colored when they are spun in the ground. During the deep processing of colored cotton textiles, there is no need for traditional techniques such as artificial coloring, bleaching, dyeing and finishing, eliminating the problems caused by the use of dyes. Environmental pollution-free, it is recognized as a pure natural and pollution-free green ecological textile. Domestic and foreign scientists have used genetically modified engineering technology to gradually adapt the color, quality, type and production of colored cotton to the requirements of the modern textile industry. The selling price of its products can be three to five times that of ordinary dyed products, and it has irreplaceable advantages in terms of economic and social benefits that other textiles cannot replace. According to the prediction of the International Council of Organic Agriculture, in the next 30 years, 30% of the total cotton production will be replaced by green ecological cotton.
Our company has developed a colored cotton far-infrared polypropylene shirt fabric by blending far-infrared polypropylene (PP) outer-protection polypropylene as raw material from the market. The product specification is CJ/PP283119.4.
1Raw material performance indicators
1.1 Colored cotton
The color grade is brown 129; the breaking length is 26.14km; the single fiber strength is 3.63cN; the maturity coefficient is 1.62; the short staple rate is 12.2%; there are 44 cotton defects/5g; 11.2 neps/5g.
1.2 Far-infrared polypropylene (PP)
Specification: 1.65dtex×38mm; breaking elongation 50.19%; breaking strength 3.41cN; specific resistance 5.0×107·cm.
2Process flow (indicated by machine model)
2.1 Textile Department
2.2 Oribe
3Technical keys of each process
3.1 Textile Department
3.1.1 Cleaning: Due to the small moisture regain of far-infrared polypropylene fiber, it is easy to generate static electricity. At the beginning of production, the polypropylene rolls were easily damaged during transportation. The cotton mesh automatically broke on the carding machine and normal production could not be performed. For this reason, we have taken the following measures :
(1) The far-infrared polypropylene bag enters the workshop 24 hours in advance to balance it with the temperature and humidity of the workshop;
(2) After opening the package, spray 10% anti-static agent solution on the surface of the far-infrared polypropylene fiber package. The water temperature should be controlled at about 40°C. The sprayed polypropylene fiber must be manually mixed evenly;
(3) Use chemical fiber packaging leather to make cotton roll covers, and each cotton roll must be tightly wrapped to maintain a stable moisture regain and prevent the polypropylene roll from being broken;
(4) The carding and beating speed of the A036C cotton cleaning machine is lower than that of spinning polyester fiber, which is reduced to 400r/min.
3.1.2 Carding
Changing the four-roller stripping to the single-roller stripping can reduce the Saxon evenness by 5 percentage points. At the same time, the cotton web is clear, transfers well, and is not easy to break. Carding adopts a close-gauge, slow-speed process to reduce fiber damage.
The carding process parameters are shown in Table 1.
3.1.3 Drawing
The process adopts the design of small draft in the first draw, 1.7~1.8 times in the rear area, 1.3 times in the second draw, and 1.3 times in the third draw to improve the draw evenness. There are three upper and lower pressure rods in the drafting shape, pneumatic pressurization, and three mixing steps to ensure uniformity. The drawing process parameters and quality data are shown in Table 2.
3.1.4 Roving
Adopting the process design of “large spacing in the rear area and centralized control”, the roughness and quality data are guaranteed to be shown in Table 3.
3.1.5Spinning yarn
The spun yarn is heavily pressurized, with large gaps and small drafts in the back area, and the use of soft rubber rollers and other technological measures.
The process parameters are shown in Table 4.
3.2 Oribe
3.2.1 collateral channels
Since the colored cotton itself has a lot of neps and impurities, the Auto-coner238 automatic winding machine was selected to remove thick spots, small details and large neps to the maximum extent. At the same time, the speed of the machine was appropriately reduced, and the line speed of the same yarn number of the original white cotton was changed. 1100m/min is reduced to 1000m/min to reduce the generation of hairiness. The parameter settings of the electronic yarn clearer are shown in Table 5.
3.2.2 Warping
The weight of the set tension ring is 1g less than that of the same type of white cotton, ensuring sensitive automatic stop of end breakage and accurate and timely positioning of the replenishing end. Tension ring weight: front 6g, middle 5g, rear 4g.
3.2.3 Sizing
Since the pigments of natural colored cotton are unstable, the pigments will change when encountering acids, alkali and strong oxidants. In addition, no harmful substances can be produced during the sizing process to ensure the “green” environmental protection of the colored cotton textile processing. Therefore, the slurry formula is formulated in Table 6.
This variety has high density, fine yarn number, high yarn hairiness, and large coverage coefficient. In order to ensure the quality of sizing yarn, the process principle of “high density, low tension, and covering and penetration is taken into consideration” is adopted to achieve strength, stretch retention, and adhesion. Purpose of hairiness. The sizing process indicators are shown in Table 7
3.2.4 Weaving process
Measures:
(1) In view of the large warp density of this variety, the warp yarns are easily entangled with each other after warp breaking. The weaving adopts a low back beam process. While lowering the warp stopping frame, adjust the warp breaking and closing device, and process two dovetail grooves on O14 and L1. The groove angle is processed to make the car closing more sensitive and effective;
(2) Adjust the let-off and take-up mechanisms, use double cloth guide rollers to increase the wrapping angle, and cover one of the cloth guide rollers with rubber to increase friction on the cloth surface and reduce cloth surface sliding;
(3) Improve the quality of the machine, ensure that the curtains are three level, adjust the lifting device, the needle closing machine must be sensitive, and the induction device specifications must be accurate. The weaving process is shown in Table 8.
4Product quality
The yarn quality of CJ/PP14.6tex is shown in Table 9. The test results of physical indicators of gray fabric are shown in Table 10.
What is the use of far-infrared fiber in functional fiber fabrics?
Far-infrared fiber is made by melting ceramic powder with synthetic fibers such as polyester, polypropylene, and viscose before spinning
It can convert the absorbed solar energy into the heat energy needed by the human body, promote blood circulation, increase the blood and oxygen supply of the human body, speed up the metabolism, and improve the human body’s muscle energy. Products are mainly used in medical and health carefield. If you have any needs in this regard
Far-infrared polypropylene fiber is a fiber that efficiently absorbs and emits far-infrared rays by adding far-infrared ceramic powder to polypropylene fiber. This kind of fiber can emit 7-14cm of far-infrared rays to the human body at a certain temperature. The energy it carries is easily absorbed by the resonance of water molecules in the human body, causing a local warming effect on the human body and promoting blood circulation. Due to the resonance effect, it also improves Most biological activities play a role in regulating body metabolism and improving human immune function. Clothing made of far-infrared polypropylene fiber interwoven with cotton blends has broad application prospects.
2. Process flow of polypropylene far-infrared fabric:
Turning→Singeing→Desizing→Bleaching→Dyeing→Softening→Tentering→Preshrunk turning
3. Characteristics of dyeing and finishing of polypropylene far-infrared fabrics:
(1) Polypropylene and cotton blended fabrics have a certain amount of hairiness on the cotton fibers during weaving, so the singeing process is very critical. However, because polypropylene has a low melting point and is easy to melt at high temperatures, the singeing speed must be fast. We generally control At 140-150 m/min.
(2) After desizing using low-alkali desizing, oxygen bleaching is used to treat the quality of the semi-finished product, which will meet the dyeing requirements.
(3) Since polypropylene fiber is not resistant to strong alkali and will become hard to the touch after mercerization, it is best not to perform mercerization treatment.
(4) Dyeing. Since polypropylene is difficult to dye, the shirt fabrics we make are only dyed with cotton parts, and they are all light colors, which is ideal for the effect.
(5) The melting point of polypropylene fiber is only 186°C. Due to the low melting point, we determined through experiments that the setting temperature should be controlled within 135-140°C, otherwise the fabric strength will be seriously lost.
(6) Due to the wet comfort properties of polypropylene far infrared and cotton fiber blended fabrics, hydrophilic softeners are used in post-finishing to improve the softness of the fabric.
Through the implementation of several key measures, the clarity of weaving openings has been improved, defects such as warp adhesion and “three jumps” have been reduced, and the difficulty in rolling cloth caused by the tightness of the fabric has been overcome. After tracking tests, the warp yarns of the loom were broken. The end rate is controlled at 0.35 yarns/machine·h, the weft breakage rate is controlled at 0.25 yarns/machine·h, the weaving efficiency reaches 87%, and the first-class rate of gray fabrics off the machine reaches 85%.
5Conclusion
Through the development of this product, it is concluded that the pretreatment of far-infrared polypropylene is the key to the entire production. Facing the current increasingly fierce competition in white cotton products, the development of colored cotton products is undoubtedly a new economic growth point. Currently, our company is preparing to pass the “Green Passport” ISO14000 system certification for this product and obtain the “Ecological Textile Standard 100” (OKO-TEX100) authorization to provide effective technical support for expanding product exports. BMgNH5BvPt
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