Table 1 The best absorption wavelength range of fabric for infrared rays Fabric near infrared absorption band Far infrared absorption band First absorption zone Second absorption zone Third absorption zone Pure cotton 8080 cotton velvet rayon wool Acrylic fiber In the 1990s, China absorbed and successfully copied foreign advanced far-infrared directional radiators with a spectral range of 1.5-15 pm. Such radiators have high-efficiency directional radiation with a maximum scattering angle of 15*. Special coatings are highly infrared. Reflectivity to prevent heat loss. However, there are two defects in this type of radiator: the problem of large temperature difference between the middle and the two sides is still not solved; in the case of high temperature coating, it is easy to fall off, pollute the cloth surface, and affect the life of the heating wire.
In recent years, domestic research institutes have improved this: in view of the temperature problem of the original far-infrared radiator, the infrared field intensity integration principle is applied, so that the temperature of the radiator is arranged as curve 2, under the joint action of curves 1 and 2. A mean temperature line 3 is generated, and the temperature difference between the two sides and the middle is *3* (:, the temperature difference problem is well solved.
The use of advanced 1 ~ 1.5mm thick ceramsite infrared radiation coating, the spectral coverage is wider, the radiation intensity is stronger, more robust, thus overcoming the dust pollution of the far-infrared radiator in use, greatly extending the rubber The influencing factors of cockroach's prevention of frying include: roller spacer, front roller pressurization, steel wire, rough fry inspection, apron and leather roller state and gas shape and closing method. And pointed out the precautions for rubber band crepe.
Jiangyin Ninth Textile Mill Chen Yajian's reduction of rubber band yarn (also known as seersucker) is one of the main tasks of the spinning workshop. The number of rubber band yarns produced by the blended raw materials in the spinning process is small, and the damage is very large. It not only affects the repair time, but also induces weaving and dyeing, which is one of the important factors that cause the reduction.
1 The theoretical cause of rubber band yarns We know that the length of chemical fiber is longer than that of wool fiber under normal conditions, and the chemical fiber raw material itself will inevitably produce some super long and long fiber defects. During the drawing process, when the front end of these super long and long fiber has reached the front roller jaw, the tail end is still under the control of the strong central frictional force. If the control force of the fiber exceeds the guiding force given by the front roller at this time, the front roller handle is passed at the speed of the middle roller to form the instantaneous axis of the sliver, and the other fibers of the previous roller speed output surround the axis. Twisted into yarn. After the super long and long fiber is output from the front roller, it is retracted due to its elasticity, that is, a rubber band yarn is formed.
2 Influencing factors of rubber band yarn production The drafting mechanism of the roller spacer spinning machine is a three-roller double apron single-zone sliding type.
Since the simple roller control fiber has a small effect, the drafting load cannot be excessively large, but if the roller spacer is reduced, it is inevitably limited by the fiber length and the drafting force, and the gauge is too small, which may damage or even break the normal fiber. There is a hard head or deteriorated weight failure rate, but the drafting force is too large, but the holding power is insufficient, and the rubber band yarn and the hard head are often generated; the drafting force is too small, and the middle part lengthens the service life of the heating wire. Its unique dual-source radiation structure re-energizes 35 compared to electrical infrared radiation, which has a high intensity of infrared radiation. At present, the heating power used in the infrared drying process in dyeing and finishing production is 25~35kW/m2 for electric heating infrared rays and 100kW/m2 for gas infrared rays. The former for radiation evaporation of fabrics reaches 20kg/(hm2) or more. Up to 100kg / (hm2). However, the infrared wavelength of the gas-fired radiator is mainly wavelength of l~6nm, and its radiant energy accounts for 70% of the total radiant energy, and the peak wavelength is 2.8 pm. The relationship between the wavelength and the radiation intensity is as follows. There is a tempering phenomenon in the use of gas-fired radiators, such as the use of city gas. Due to the large fluctuation range of gas pressure within one day, it may cause uneven drying; the temperature of the machine is difficult to control, which affects the quality and output of the product. Electric heating type is convenient to adjust, can stably supply heat, meet process requirements, improve product quality and output. 4. Gas-fired and electrothermal energy consumption compares gas-fired infrared radiators. If urban gas is applied, the required amount is 106.4mVh. At 0.95 yuan/m3, it costs about 101 yuan per hour. The installed capacity of the electrothermal near-mid-infrared radiator is 240 kW, which is about 0.45 yuan/kW, and the hour is about 108 yuan. The electrothermal far-infrared directional radiator can achieve the same effect with only 72 kW, and costs about 32 yuan per hour. It can be seen that the far-infrared directional radiator can save about 60% energy compared with the former.
The analysis and comparison, the electrothermal far-infrared fixed-wrap radiator has a broad future in the printing and dyeing industry due to its temperature-degree hook, long life* and remarkable energy-saving effect.
Textile Guide 2001NO.2
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