CN100582331C - High shrinkage acrylic fiber tow making method - Google Patents

Abstract

The invention relates to a method for making high-shrinkage acrylic fiber tow strips. The production process of high-shrinkage stretched strips: electric heating plate temperature ℃: site temperature; drafting multiple in the thermal extension zone: 1.25 times; re-cut zone spacing: 130mm; Gauge of re-cutting area: 115mm; draft ratio of feeding area: 1.05 times; draft ratio of pre-drawing area 1.31 times; draft ratio of main drawing area 1.88 times; draft ratio of re-cutting area 1.30 times; front re-cutting area The drafting ratio is 1.58 times; the normal production process of the broken strip: the temperature of the electric heating plate ℃: the site temperature; the drafting ratio in the thermal extension zone: 1.25 times; the distance between the re-cut area: 130mm; The drafting ratio in the feeding area is 1.05 times; the drafting ratio in the pre-drawing area is 1.31 times; the drafting ratio in the main drawing area is 1.80 times; the drafting ratio in the re-cutting area is 1.25 times; , to ensure the fiber quality, reduce energy consumption and improve the ambient temperature.

Description

High shrinkage acrylic fiber tow making method

technical field

The invention relates to a sliver-making method of high-shrinkage acrylic fiber tow applied in the drawing-breaking process of acrylic fiber tow, which can be used to produce regular acrylic wool tops.

Background technique

The structure of acrylic fibers is that the acrylic macromolecules are in an irregular helical conformation and do not have a real crystalline structure. Therefore, there are no strict crystalline regions and amorphous regions, only high-order regions and low-order regions. The structure of acrylic fibers It is not as stable as the real crystalline structure, and it shows thermoelasticity when heated. Acrylic puffed tops are processed and manufactured by using this thermoelasticity. The manufacturing principle of acrylic puffy wool top is that acrylic fiber is first stretched under the heating of the breaking machine, and then cooled under the tension. At this time, there is a kind of strain hidden inside the fiber - potential shrinkage. The fiber in this state is called " High Shrinkage Fiber". After the high-shrinkage fiber is processed beyond the stretching temperature, the potential shrinkage disappears, and the fiber that has lost the strain is called "regular fiber". Mix high-shrinkage fibers and regular fibers in a certain proportion, and then go through processes such as carding and drawing, and finally make bulky tops. If the bulky tops are made into bulky yarns, the yarn or thread is steamed. Or hot water treatment, in which the high-shrinkage fiber retracts and is located in the center of the yarn, while the normal fibers mixed together are pulled into a curled shape because they are no longer retracted, and are on the surface of the yarn, which makes the volume of the yarn expand and form The bulky yarn is obtained, which is the manufacturing principle of the acrylic bulked top. At present, the methods for producing bulky wool tops mostly adopt the breaking method to make strips. This method has a short process flow and a small footprint, which can save manpower, material resources and energy. It has a high degree of automation, high speed and is easy to manage. But because this method is to make the tow be broken forcibly on the breaking machine, and the breaking in each area is random, so the short hair rate of the produced product is higher. The stretch-breaking method is to use a multi-zone stretch-breaking machine to break the filament bundle. In this process, after heating, cooling or steaming, it is made into a high-shrinkage strip or regular strip with a certain curl, and then the high-shrinkage strip And regular strips are mixed and carded at a weight ratio of 4:6 to make acrylic bulked tops. The process flow is shown in Figure 1.

For ordinary acrylic tow, heating by electric heating plate is a necessary process to improve the shrinkage of acrylic tops, and it is also a necessary guarantee for the production of bulky tops. However, it is an unnecessary condition for the production of bulky tops by using high-shrinkage acrylic fiber tow, so that energy consumption can be reduced. And for the production of ordinary acrylic fiber tow, it is not necessary to set the electric heating plate to 135°C if producing regular tops, so that the broken fibers can increase the shrinkage and then use steaming to eliminate the shrinkage. Therefore, the same process method is adopted to cancel the hot plate temperature of the breaking machine for producing regular tops. After practical application, it also meets the requirements of the equipment.

Contents of the invention

The purpose of the present invention is to "cancel the electric heating plate heating" process control program in the process of producing bulky tops from high-shrinkage acrylic fiber tow, and adjust the drafting ratio of the stretching machine and the gauge parameters of the re-cutting area to produce All the indicators of the bulked wool top have reached the level of the original process, and have no effect on the spinnability of the fiber, and can meet the normal requirements of the production equipment.

After research, in the process of using high-shrinkage acrylic fiber tow to produce bulky tops, the temperature of the electric heating plate of the stretching machine has no effect on the shrinkage of the tops. In order to apply this discovery, the key is how to ensure product quality and reduce production consumption. After adopting the new sliver making method of "cancelling electric heating plate heating", by adjusting the drafting ratio of the stretching machine and the process parameters of the re-cutting interval, all the indicators of the produced bulky wool tops have reached the original process production level. On the basis of this research, the temperature of the electromechanical heating plate of the breaking machine for the production of regular wool tops is canceled, that is, the production is carried out at room temperature. The main process parameters of its production are as follows:

Table 1 The main production process parameters of the pull-off process

Pull off area New process method The original process method Improved effect Heating plate temperature ℃ Site temperature 135 Reduce production costs and improve the working environment. Draft multiple in thermal elongation zone 1.23-1.27 1.27-1.31 Reduce the operating load in the area Re-cut area interval mm 130-135 120-125 Lighten the load in the area Front re-cut area spacing mm 110-115 105-110 Lighten the load in the area

The high-shrinkage tow sliver making adopts the new process method, which has no effect on the spinnability of the fiber; and can meet the requirements of the production equipment; through process adjustment, the quality of the produced products meets the requirements, and the indicators reach the original process production status.

Economic benefit calculation:

(1) The electric heating plate heating is canceled, and the cost of electricity consumption for producing high-shrinkage wool tops with high-shrinkage tow is reduced by 5.54 yuan per ton; the cost of regular wool tops is reduced by 3.72 yuan per ton, so the cost per ton of bulked wool tops produced is reduced by 9.26 yuan.

(2) Since the annual working time of the electric heating plate and the instrument has been greatly reduced by 65%, it not only prolongs its service life, but also reduces the loss of spare parts by 14,000 yuan per year.

(3) If the temperature of the electric heating plate is too high, the tow will turn yellow; therefore, canceling the heating of the electric heating plate can ensure the quality of the fiber.

(4) After canceling the heating of the electric heating plate, the acrylic tow does not need to be heated in the thermal extension zone, thus greatly reducing the cooling energy consumption of the cooling circulating water and reducing the workload of the ice machine system.

(5) Especially in summer, canceling the electric heating plate heating is conducive to improving the indoor working environment temperature.

Description of drawings

Figure 1 The process flow of strip making by pulling off method

Fig. 2 the present invention draws off the strip making technological process

Detailed ways

The new method of high-shrinkage acrylic fiber tow sliver production was carried out in the second workshop of the acrylic fiber factory of Daqing Petrochemical Company, and the expected effect was received. The production cost decreased, the consumption of electric heating plates and instrument accessories was reduced, and the spare parts of the breaking machine equipment remained at the original level. In the entire production process, only the production process of the stretching machine has been improved, and other production processes remain the original process. The production process details of the breaking process are as follows:

Table 2 Production process of high shrinkage broken strip

Pull off area New process method The original process method Improved effect Heating plate temperature ℃ Site temperature 135 Reduce production costs and improve the working environment. Draft multiple in feeding zone 1.05 1.05 Draft multiple in thermal elongation zone 1.25 1.31 Reduce the operating load in the area Drafting ratio in pre-drawing zone 1.31 1.29 Slightly increase the load of the area Draft multiple in main draw zone 1.88 1.77 Increase the load in this area and reduce the load in the recut area. Draft multiple of recut area 1.30 1.20 Control fiber length distribution Draft multiple of front recutting area 1.58 1.58 Re-cut area interval mm 130 125 Lighten the load in the area Front re-cut area spacing mm 115 110 Lighten the load in the area

Table 3 Production process of regular stretched broken strips

Pull off area New process method The original process method Improved effect Heating plate temperature ℃ Site temperature 135 Reduce production costs and improve the working environment. Draft multiple in feeding zone 1.05 1.05 Draft multiple in thermal elongation zone 1.25 1.31 Reduce the operating load in the area Drafting ratio in pre-drawing zone 1.31 1.29 Slightly increase the load of the area Draft multiple in main draw zone 1.80 1.70 Increase the load in this area and reduce the load in the recut area. Draft multiple of recut area 1.25 1.20 Control fiber length distribution Draft multiple of front recutting area 1.58 1.58 Re-cut area interval mm 130 125 Lighten the load in the area Front re-cut area spacing mm 115 110 Lighten the load in the area

Claims (1)

1. A high-shrinkage acrylic fiber tow sliver-making method, it is to use high-shrinkage acrylic fiber tow and conventional acrylic fiber tow two kinds of raw materials, respectively break through the strip production process of stretching, and conventional acrylic fiber tow is steamed after being broken. Treat and make regular break strips, then the high shrinkage break strips with high-shrinkage acrylic fiber tows and the regular break strips made by steam treatment after breaking high-shrinkage acrylic tows are in the ratio of 40%: 60% by weight Mixed strips to produce high-shrinkage puffy tops, which are characterized by: Production process of high shrinkage broken strip: Heating plate temperature ℃: on-site temperature; draft ratio in thermal extension zone: 1.25 times; distance between recut zone: 130mm; distance between front recut zone: 115mm; draft multiple in feeding zone: 1.05 times; The drafting ratio is 1.31 times; the drafting ratio in the main drawing area is 1.88 times; the drafting ratio in the re-cutting area is 1.30 times; the drafting ratio in the front re-cutting area is 1.58 times; And the production process of regular broken strips: Heating plate temperature ℃: on-site temperature; drafting ratio in hot extension zone: 1.25 times; distance between recutting zone: 130mm; spacing in front recutting zone: 115mm; drafting multiple in feeding zone: 1.05 times; The multiple is 1.31 times; the drafting multiple in the main drawing zone is 1.80 times; the drafting multiple in the recutting zone is 1.25 times; the drafting multiple in the front recutting zone is 1.58 times.

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