Reasonable Selection Of Carding Spacing To Improve Yarn Quality Greatly

Using super large angle cylinder to increase rack density

The use of large angle or super angle tin forest is to improve. Comber Carding and improving the quality of combing yarn. For example, the area of Xilin carding area with a tooth surface angle of 111 degrees and 130 degrees can be increased by 24.4% and 44.5%. The combing cylinder developed by Graff, Switzerland not only considered the density of Xilin, but also considered the factors such as optimizing the needle angle, the density of needle teeth, and so on. The total grooming points of PRIMACOMB series Xilin, 5028 and 5030 cylinder, were 111 and 38 thousand, respectively, and the 130 degree tooth surface angle developed jointly by Graff and Lida was only applicable to the combing cylinder Ri-O-Comb series of E80 comber. Practice has proved that the comber can obtain better quality under the same capacity and droppings rate when adopting a large angle tin forest. Under the same quality and droppings rate, the comber can get higher production capacity, and the cotton drop rate decreases with the same quality and productivity.

The embedded sawtooth monolithic cylinder is coated with strong spinnability. Spin Enterprises are widely used. In order to ensure the maximum carding efficiency of Xilin, many enterprises use reasonable arrangement and appropriately increase the rack density in the carding area in the limited cylinder forest interval. This not only strengthens the puncture, grabbing and loosening carding efficiency of the rack in the front area, but also avoids the overtightness of the rack in the front area, but reduces the carding efficiency of the carding area, which leads to the phenomenon of the output of the comber in the high speed state.

The German schle company optimized the arrangement of needle angle and pinion density, for example, the 90 front of the 90 series combing cylinder cylinder with a tooth surface angle of 90 degrees were all 25 teeth / square centimeter, 62 teeth / square centimeter, and increased the carding point by changing the rack density of the back area. The maximum comb point of this series of Xilin is only 30305 points, while the new two series of Xilin 96 series density is 53 teeth / square centimeter, 88 teeth / square centimeter, and the maximum carding point can reach 38980 points.

While mastering the gradient configuration, properly increasing the rack density can not only remove the smaller neps, make the fibers more single, improve the removal efficiency of small neps and short linen, but also improve the yarn quality when using the same noil.

Reasonable selection of carding spacing greatly improved Yarn formation quality

In order to cater for the demand of increasing the total carding point of the cylinder, the processing of cylinder rack density has increased and the number of carding points is getting higher and higher. Although carding component manufacturers have made unremitting efforts in combing the material selection, process optimization and surface finish treatment, they still can not solve the contradiction between the high speed and high efficiency of the comber and the shortening of the sharpness degradation cycle of the Xilin rack.

In Germany, the material of schiltsin's tooth piece is alloy steel. The tooth piece has higher sharpness, hardness and smoothness. For example, the carding spacer on the E62 machine is 0.45 millimeters, 0.3 millimeters and 0.4 millimeters respectively, which can completely satisfy the meticulous carding of Xilin to Xu plexus. If the carding spacing of the cylinder is reduced, it will aggravate the damage of fiber, resulting in the increase of short staple rate and droppings rate.

Although most of the materials made of Xilin gear have been imported, the tooth shape, material and heat treatment technology need further improvement. There is still a certain gap between the sharpness and hardness of the teeth and the import of Xilin. fibre The ability to puncture, open and remove neps and short lint is slightly worse.

Through a large number of comparative tests of adjusting the cylinder gap, it is shown that the carding gap of domestic Jinfeng Xilin can be reduced properly, for example, the front area is 0.3 mm ~0.35 mm, the tightest point is 0.2 mm, the rear area is 0.25 mm, and the eye difference of each carding gap is controlled. The comb elements are scientifically managed, and the yarn quality of spinning can be greatly improved by combing the dropout rate unchanged.