Discussion On Spinning Process And Equipment Of Regenerated Cellulose Fiber

Due to the increasingly tight supply of non renewable resources such as oil, the development of various regeneration

Prime fiber has become the main channel to obtain new textile materials, which has made great progress in regenerated cellulose fibers in recent years.

The common characteristics of regenerated cellulose fibers are: long and regular fibers, no neps.

In particular, the performance of plant regenerated cellulose fibers is close to that of cotton. At present, enterprises basically use the existing cotton spinning equipment to pform and process.

Regenerated cellulose fibers

equipment

At present, spinning equipment for spinning and reprocessing cellulose fibers in China's spinning enterprises is basically a series of "1", "A" and "FA" series cotton spinning equipments, which are properly pformed and combined.

The main reasons are as follows: most of the regenerated cellulose fibers produced by the factories are still in the development stage of trial, so they are trial spinning and trial production on the existing equipment; the regenerated cellulose fiber products are of a small batch; regenerated cellulose fibers, especially functional products, are pure spinning less and multi component blended spinning, and are not suitable for mass production.

The main reason is that there is not a set of special equipment designed and manufactured according to the characteristics of regenerated cellulose fibers.

From the configuration of each plant, two parts of cotton, carding equipment and coarse and fine equipment can be distinguished.

The previous part of the carding equipment is diversified because of the large number of equipment types.

In the latter part, if the pure spinning is basically similar to that of pure cotton, most of the blended products will be made of strips, so there is no big change except for the three bars.

This paper focuses on the analysis of the cotton cleaning process configuration and measures.

Regenerated cellulose fibers are of neat length, no knot, but long fibers and wires. Therefore, the process of blowing and carding should be shortened, blending evenly, combing lightly, striking less, and preventing stickiness.

And raw sliver.

At present, there are basically three models for the blowing and combing process of regenerated cellulose fibers in China.

The basic process of spinning cotton type is: A002 to A036 (FA106) to A036 to A092 (FAl91\SFA161) to A076C to 1181C (A186D / E) FA23A.

That is to say, the "A" word series equipment is the main way, and the two way is open. Among them, the A036 puncher changes the comb, the FAl06 matches the comb, and the vibratory cotton case is added to the roll, and the carding is mainly 1181C.

The basic process of short flow type is: A002 to FA002 multi warehouse, A03 to F092, A076 to A186D.

This process is also mainly based on the "A" word series equipment, plus a multi storehouse mixer, using a loose opening, using a multi pin hand driver (including A036 to change the needle hand), and carding is mainly A186.

The basic process of blowing carding unit is: BDT019 grabbing machine, LVSAB coagulating device, MM6 multi storehouse, LVSAB condenser, FBK cotton box and DK740 cotton catching machine.

This process is part of Germany's special textile process.

Guangdong Zhanjiang cotton mill is used to produce modal 19.7tex yarn.

This mode is short, and it is a mixture.

The carding machine does not open the equipment because it is not mixed, so it only opens lightly on the cotton picker.

Judging from the above three modes, the first mode is the largest, accounting for 73%. The production and trial production of the existing equipment can be used more or more, and the production requirements can also be achieved. However, the long flow process, too much loosening and sticky entanglement are not consistent with the characteristics of cellulose fibers in theory.

Short flow mode also belongs to the spinning process, accounting for 25%.

There is an improvement in the first mode, that is to reduce one opening and increase the number of bunker to improve the mixing effect, but the phenomenon of sticky phenomenon of some fibers can not be overcome.

The third mode adopts the short flow blowing carding unit, which is used as a grab and a mixer without opening the cleaning equipment. It only opens on the cotton catching machine. It is suitable for the characteristics of regenerated cellulose fiber, and it can beat lightly, play less and roll lightly, so the product's short staple rate is low.

The biggest advantage of this process is to cancel the volume, and therefore the phenomenon of sticky coil. The enterprises with the conditions should try to adopt third modes.

Problems to be explored

Because regenerated cellulose fiber is different from cotton and synthetic fiber, it can only borrow cotton spinning equipment and synthetic fiber process flow in spinning process. Although it can also spin yarn, some common difficulties are difficult to solve, such as cotton sticky layer, difficult carding, slanting tube, and entangled rollers.

For example, small batch and multi component cotton blending, we need to discuss the following problems.

equipment

The most common difficulty in the spinning process of spinning and opening cotton fabric for the regenerated cellulose fiber is sticky roll. The best solution to solve the problem is blowing carding, but at present the output of blowing carding is higher, so it is not suitable for small batch production.

To this end, it is suggested that a small batch of mini type regenerated cellulose fiber blowing carding unit should be developed for textile machinery enterprises.

Most of the regenerated cellulose fibers are blended for the sake of accurate mixing ratio and different treatment of different raw materials. At present, most of them are used for blending and drawing, and the drawing can not be less than three.

Therefore, the management is complex, the cooked strips are over ripe, and some old factories are also having difficulty in upgrading the drawing frame.

To this end, it is suggested that the spinning machine plant develop a cotton opener which can handle different raw materials and processes, and weigh feed to ensure the mixing ratio.

In addition, we need to develop a drawing machine with small footprint and high output.

equipment

The main problem is the card clothing problem, which is now spinning the regenerated cellulose fiber carding clothing, and also using chemical fibre clothing or cotton and chemical fiber dual purpose clothing.

In view of the carding characteristics of regenerated cellulose fibers, the flexible comb is the main choice, and the short combing elements are selected. The high density and ultra-thin work surface of the card clothing and the clean flower adopt the prismatic three dimensional main body to comb the needle teeth. The ceramic processing on the side surface keeps the long-term smoothness, sharpness and rigidity, and the main combing elements such as the thorn roller, the cylinder and the doffer can also be pottery treated.

In the processing of soybean protein fiber, the use of special specifications Carding Clothing and reasonable matching of the needle bar angle of work, help to solve fiber floating, cotton net falling, difficult to strip.

Therefore, it is necessary to develop card clothing suitable for processing regenerated cellulose fibers.

The selection of carding elements was carried out in Shanghai seventeenth cotton textile mill when spinning modal yarns.

When producing 0.9D * 38mm fine denier fiber yarn, the needle clothing is first selected from the angle of chemical fiber, and the AC2515 AC2515 1560 fine denier chemical fiber clothing is used. The density of the teeth is increased than that of the conventional SAC2810 * 1667 card clothing. The depth of the tooth and the working angle are all decreased. The density of the teeth increases, so that the ability of grasping and holding the fiber is improved, the carding degree is improved, and the fiber sinks into the backlash.

Doffer uses conventional chemical fibre clothing AD4030 x 1890, and the cover plate is MCZH26.

Increase carding effect.

Then the cotton clothing was chosen to select the card clothing. The cylinder angle was AC2525 x 1560, which was 15 degrees lower than the SAC2810 * 1667 working angle. The ability of grasping and holding the cylinder was increased by 15 degrees. The pverse density and the tip density of 95 teeth / (25.4mm) 2 were increased to improve the carding degree, improve the straightness and separation of the fibers, improve the clarity of the cotton net, and choose the MCH36 for the cover. The density of the needle teeth increased 80~100 teeth / (2), and the carding degree increased.

In order to reduce the working angle of the card clothing, Chan Xilin speed increased from 300m / min to 330m / min.

In order to reduce the cover plate, the upper cover is raised as much as possible, and the gap between the top and the cylinder is 0.78mm received by 1.09mm.

Through the trial spinning observation, the clarity of the web increased, and the neps and evenness did not decrease.

The use of card clothing from cotton fiber angle enhances the ability of Xilin to grasp and grasp fibers.

The ability to improve carding degree improves fiber straightness and separation, and the quality of spinning yarn is better than that of synthetic fiber card clothing, but the cover plate flower is obviously increased.

Editor in chief: Wang Xiaonan