Loose fiber dyeing process

Abstract

The invention relates to a loose fiber dyeing process and belongs to technical field of fiber dyeing. The process sequentially includes: grabbing cotton, forming nets, soaking, mangling, forming rolls, cold piling, unrolling, washing, squeezing, splitting, spreading and drying. Squeezed loose fibers are fed to the spreading procedure after splitting, the loose fibers are squeezed at the squeezing force of 3-15kg / cm<2> under the premise of not damaging the fibers, the squeezed dyed fibers are directly fed through a lower conveying belt to an eight-cage dryer or a loose fiber high-frequency dryer for drying. By the process, the defects that continuous production cannot be performed and machining efficiency is low in conventional technologies are overcome, the defects that of uneven dyeing, low drying efficiency, large energy consumption and the like when the loose fibers are dried in a net structure are overcome, fiber damage is low during processing, and the quality of the finished fibers is guaranteed.

Description

technical field [0001] The invention relates to a loose fiber dyeing process, which belongs to the technical field of fiber dyeing. Background technique [0002] Conventional fiber dyeing is carried out in the dyeing vat, and the loose fiber cake is hung into the dyeing vat for dip dyeing. The defects of this method are: 1. During the dyeing process, it is necessary to add auxiliary dyeing accelerators and dyeing enhancers to Ensure the dyeing rate; 2. During the dyeing process, refining, bleaching, washing, softening and other processes are required, the processing process is long and the operation is cumbersome; 3. The dyeing process is carried out by dipping, the dyeing cycle is long, and the dyeing uniformity Not good, the dyeing vat needs to be equipped with main pumps, auxiliary pumps and other devices, which consume a lot of power and energy. [0003] Invention patent (application number 201210138452.7) The loose fiber cold pad-batch dyeing process includes four step...

AI Technical Summary

Problems solved by technology

[0002] Conventional fiber dyeing is carried out in the dyeing vat, and the loose fiber cake is hung into the dyeing vat for dip dyeing. The defects of this method are: 1. During the dyeing process, it is necessary to add auxiliary dyeing accelerators and dyeing enhancers to Ensure the dyeing rate; 2. During the dyeing process, refining, bleaching, washing, softening and other processes are required, the processing process is long and the operation is cumbersome; 3. The dyeing process is carried out by dipping, the dyeing cycle is long, and the dyeing uniformity Not good, the dyeing vat needs to be equipped with main pumps, auxiliary pumps and other devices, which consume a lot of power and energy

[0007] First, the repeated coiling and unwinding processes affect the mechanical properties of loose fibers

In patent 201210138452.7 and patent 201210139796.X, after the loose fiber is dyed with the dye solution in the immersion tank, it has to go through multiple coiling and unwinding processes. The coiling process needs to form a compact structure under high pressure conditions, and the fibers are bonded in At the same time, this requires that a strong force must be used to spread the loose fiber rolls in the matching unwinding process, but repeated unwinding in multiple channels will cause fiber damage, high fiber content, and repeated unwinding. Rolling will lead to poor cohesion between fibers, high hairiness content in subsequent use, poor spinnability, serious pilling, affecting the final mechanical properties of loose fibers, and it is difficult to improve fiber quality

[0008] Second, winding and unwinding lead to uneven distribution of fibers and poor drying effect, which in turn affects the dyeing uniformity of finished fibers

In patent 201210138452.7 and patent 201210139796.X, based on the rolling process, the loose fiber web is formed into a loose fiber roll under high pressure conditions, and the fibers in the loose fiber roll are seriously bonded together. To ensure good drying, the prerequisite is to make the fiber Completely loosened, although multi-pass unwinding satisfies the fiber opening effect, it also damages the fibers. If the number of unwindings is too small, it will affect the loosening of loose fibers, uneven distribution of loose fibers, and the quality of loose fibers per unit area. The deviation will directly affect the drying effect, and eventually cause the loose fiber to be dyed unevenly and the appearance is not good, and this defect cannot be made up in the post-processing process, and sometimes it will expand the influence and affect the use quality of the loose fiber

[0009] Third, high energy consumption and low processing efficiency

In patent 201210138452.7, only washing with water requires about nine processes to complete, which not only takes a long time and consumes a lot of water, but also needs to use a large amount of additives in the process, and the cost is high; in patent 201210139796.X, more Rolling device and unwinding device, these devices need a large amount of steam to power them during use, and coiling and unwinding are relatively time-consuming processes, which prolongs the processing time as a whole. The amount of fiber processing is limited, which is contrary to the high-efficiency production purpose of its continuous mode, and the practicability is not good

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