The elastic metal card clothing of the carding machine is composed of a base cloth and a card needle and is planted on the base cloth as a certain development form of the steel needle. During the spinning process of the spinning frame, the semi-finished roving or sliver is drafted, twisted, and wound into a spinning machine. The combed sliver and the needle-carding machine combine the sliver, the needle row is drafted to improve the sliver structure, and the roving is further spun into spun yarn on the ring spinning frame, which is the main spinning machine. Grinder A spinning machine that turns fiber strands into rovings.
The main function is to draft and twist, and to wind the roving into a certain package to meet the processing requirements of the spinning frame. The structure of the double twisting unit of the double twisting machine mainly includes the spindle braking device, the spindle part of the double twisting machine, the yarn winding device, and the special device of the double twisting unit. The elastic card clothing is easy to fill the needle and fiber changes during carding, and cannot meet the needs of high-yield chemical fiber spinning. Therefore, in addition to the currently used spun yarns, a small amount of thin yarns are used for pull-up covers.
(1) Parameters for the structure and specifications of the elastic metal card clothing of the carding machine The structure and specifications of the elastic metal card clothing for the carding machine are shown in Figure 3-39 and Table 3-12. There are two different forms of elastic card clothing. One is to design the needle into a bent knee shape, as shown in Figure 3-39 (A),αFor the moving angle (working angle), for the planting angle. When combing, the comb needles are tilted backward by the combing force of the students, which causes the change of the distance when we comb, which affects the quality of research and combing teaching. The purpose of designing the comb needles into a bent knee shape is to reduce the Gap change.
Another manifestation of the unit clothing is to eliminate the knees of the needles, and design as a semi-rigid demand elastic clothing with straight-footed steel needles. The cross-section data of the steel needle adopts this special-shaped cut bacteria to improve the bending rigidity of the steel needle and reduce the bending and deformation; the steel needle material adopts 65 pieces of steel to improve the wear resistance and elasticity of the control needle tip; the position of the needle tip The cross section is in the shape of a wedge and a knife edge, as shown in Figure 3-39 (C), to improve the sharpness of the needle tip; shorten the needle height to withstand the risky carding force and reduce fiber congestion; appropriately and effectively reduce the work of the enterprise Angle, to enhance the device holding method to sort out the analysis ability. The semi-rigid management elastic card clothing company is currently widely used in my country as the flat card clothing for carding machines, and it is also suitable for processing industrial chemical fibers.
(2) Base fabric and needle-planting method The base fabric of the elastic card clothing of the carding machine is the basis of needle-planting. The base fabric is made of vulcanized rubber cavity (V), cotton fabric (C) and linen fabric (L) and other multi-layer fabrics are glued together with compound rubber. To ensure that the base fabric has the characteristics of strong separation, good elasticity and small elongation. At present, Xinjinlong and Doffer elastic card clothing is made of five layers of rubber and five layers of rubber mycelium, and the cover cloth is made of seven layers of rubber surface and eight layers of rubber.
See Table 3-12. According to the different process design requirements of the enterprise, the comb needles planted on the base fabric can adopt various specifications and different cross-section shapes, such as circle, triangle, fan circle, rectangle, biconvex, etc. The needles are planted on the base fabric according to a certain distribution and development law, such as a stripe, twill and satin.
At present, because the needle planting method of Xinjinlong and Doffer card clothing is mostly satin, and the cover plate is mostly twill. The company structure of flat card clothing is divided into double row and single row city. For example, the 702 type cover has 10 rows of needles in the front row and 10 rows of needles in the rear row. There is a 7mm wide gap in the middle of the card clothing. This kind of double-row cover has the characteristics of double carding.
In the process of carding development, when the carding surface may be slightly congested as previously analyzed, it can also play an important role in carding by the knowledge of post-carding, and the gaps in the middle can accumulate short lint and impurities. harmful defects. (3) The characteristics of the new type of enterprise elastic metal card clothing In order to meet the needs of high quality and high production, a variety of new semi-rigid card clothing has been developed recently, all of which have good process performance. 1. The cross-sectional shape of the comb needle is improved.
The semi-rigid card clothing changes the cross-section of the needle from a circle to a triangle, a fan, an ellipse, etc., thereby improving the bending stiffness of the needle and reducing the bending deformation of the needle. 2. The arrangement and distribution of the needles have been modified. In the past, planting needles were arranged in twill, stripe and plain.
At present, it has developed into satin, the needle tip is distributed in a diamond shape, the horizontal needle density is increased, and the carding function is strengthened.
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