Abstract:
In order to solve the problem of elastic cover card clothing embedded in carding machines, the classification of elastic cover card clothing embedded is introduced, the reasons are analyzed and corresponding solutions are proposed. Control measures were taken, and the control of card clothing impurities in high-speed and high-yield carding machines was discussed. It is pointed out that the impregnated card clothing of the elastic cover is caused by factors such as defects in the card clothing itself, raw materials containing sugar and impurities, improper selection of card clothing, improper coordination and management of the process and impurity removal process; during production, the card clothing should be strengthened Model selection, equipment management and maintenance, reducing the total height of the elastic card clothing, increasing the needle planting angle and needle density, and improving the base fabric structure and raw steel wire cross-section can effectively control the elastic cover card clothing embeddedness.
The elastic flat card clothing is an important carding equipment on the rotary flat plate of the carding machine. During the carding process, it works together with the metal card clothing on the cylinder to bundle the fibers. Decompose and card it into single fiber state, while removing impurities and short lint. In the actual production process, due to the influence of factors such as impurities in raw materials, process elimination, process coordination and management, problems such as damage, reverse needles, random needles, needle stripping, corrosion, etc. of the flat carding needles are caused, and the card clothing is embedded in the needles. Miscellaneous hanging flowers will affect the combing effect. Therefore, the author discussed the problem of card clothing embeddedness in order to effectively control its occurrence.
Classification and impact of impurities in elastic cover card clothing
1.1 Classification of impurities
Embedded elastic cover card clothing is one of the common problems that affects the carding effect. Its main forms include: full set of card clothing inlay, partial card clothing inlay, single card clothing inlay, hanging flowers, etc.
1.2 Impact of inclusions
Due to the difficulty in cleaning the elastic cover card clothing after inclusions, This will lead to deformation of the comb needles, which will affect the card clothing’s carding, impurity removal, uniformity, and mixing effects on the fibers. It will also reduce the fiber holding, puncture, and carding release functions, and shorten the service life of the card clothing.
The reason why the elastic cover card clothing is stuffed and embedded
The elastic cover card clothing has its own defects, Raw fiber contains sugar, excessive impurities, improper selection of card clothing, improper process configuration, poor dust removal and impurity removal, untimely management and maintenance, improper methods, card clothing damage, improper temperature and humidity management, etc., all of which can lead to elastic cover plates The reason why the card clothing is filled with impurities.
Control measures for embedment and hanging of elastic cover card clothing
3.1 Improve manufacturing accuracy
Improve the manufacturing accuracy of elastic cover card clothing, focusing on controlling wear resistance, flatness, sharpness, and clarity , surface roughness and quenching uniformity, ensuring that the flatness error of the needle tip of the turning card cloth is not greater than 0.05mm, and the spacing is accurate.
3.2 Reasonable allocation of impurity removal efficiency
Optimize the ration of the carding machine so that the fiber can be Timely transfer between the forest and the rotary cover card clothing; improve the impurity removal efficiency of the raw cotton in the opening and cleaning process to reduce the impurity removal load of the carding machine card clothing on the fiber; when the impurity content of the cotton rolls and banquet cotton is too high, It is easy for the cotton flow that has not been effectively removed to enter the main carding area of the cylinder-rotary cover, causing embedding.
3.3 Reasonable selection of needle density
The traditional view is that if carding is to be strengthened, the needle density will be higher. Bigger is better, but if the needle density is too large, it will easily become embedded.
3.4 Improve sharpness and surface roughness
Traditional elastic cover card clothing generally uses The needles are ground under the machine, and the surface roughness and sharpness of the elastic cover card clothing are improved by cleaning and sharpening the needles.
3.5 Reasonable selection of combing needle planting form
Straight combing needles are affected by the combing force It is easy to tilt backward, and the needle tip rebounds in an arc, causing the distance between the two needle tip surfaces to change. It is necessary to enhance the holding force of the base fabric and the stiffness of the comb needle to reduce the backward tilt angle; while the looper comb needle can use the needle knee to tilt backward to lower the needle tip to offset it. The needle tip rebounds and resets.
3.6 Optimizing carding distance
After adopting progressively tighter gauges, the transfer resistance of the inlet fibers is reduced to achieve progressive carding, and the carding effect in the pre-carding area is enhanced, which provides conditions for the fine carding area. With the cover plate waste control measures, normal, uniform and reasonable waste can be achieved , Reduce cover inclusions.
3.7 Correctly use raw materials with high impurities and high sugar content
Generally, when the proportion of sugar-containing grade 4 or above raw cotton does not exceed 30%, the occurrence of inclusions in the cover can be effectively controlled.
3.8 Temperature and humidity management
Correct Controlling the relative humidity in the production workshop prevents card clothing from rusting and helps reduce embeddedness.
3.9 Reasonable design of dust removal parameters
Whether the dust removal parameter design is reasonable or not has a great impact on the card clothing inclusion of the elastic cover plate.
Discussion on controlling card clothing impalement in high-speed and high-output carding machines
4.1 Reduce the total height of the elastic cover card clothing
Reduce the total height of the elastic cover card clothing, the bending strength of the comb needle will increase, and it can withstand greater Large combing force reduces fiber congestion between needles.
4.2 Increase the planting angle of the looper elastic cover card clothing
Use the planting angle as 78° elastic cover card clothing, carding strength is ensured by needle density, transfer is controlled by large planting angle, and control measures combining grabbing and releasing are used to achieve stable quality.
4.3 Split-shaped needle point elastic cover plate densely planted with card clothing
The split-shaped needle tip elastic cover card clothing has better sharpness. Increasing the transverse needle density of the card clothing has a greater impact on the carding effect. By improving the needle planting method, the transverse needle density can be increased and the carding effect can be improved.Good.
4.4 Improve the cross-sectional shape of elastic cover card clothing and comb needle body
The cross-sectional shape of the comb needle body has developed from circular, triangular, and flat shapes to the current biconvex, rhombus, and oval shapes, etc., which improves the bending strength of the comb needle and reduces the bending deformation of the comb needle when combing. , the holding ability of the combing needle is improved, and the combing ability is greatly enhanced.
4.5 needle density increases
In order to make the needle density at the toe end of the card clothing of the elastic cover plate smaller and the needle density at the heel end larger, the needles are arranged in a combination of stripes and satin patterns (also known as “dense type”), so that the cylinder-elastic cover plate can be separated When combing, the toe end of the flat plate will not easily affect the carding performance due to being filled with fibers and broken seeds; the manufacturing precision of the flat plate with increased needle density should be higher to reduce the inclusion of the flat plate.
4.6 Improve the structure of the base fabric
The base fabric of the new elastic flat card clothing adopts a rubber surface , making the base fabric oil-resistant, heat-resistant, and elastic, and the embedded fibers are easy to clean; increasing the layers and thickness of the base fabric can improve the strength, elasticity, and holding power of the base fabric.
Conclusion
Elastic cover needle During the carding process, the cloth cooperates with the cylinder card clothing to decompose and card the bundle fibers into a single fiber state, while eliminating impurities and short lint. However, due to the defects of the card clothing itself, the impurities in the raw materials, the coordination of the process and improper management, etc., problems such as damage to the comb needles of the elastic cover card clothing, back needles, random needles, needle stripping, and corrosion have resulted. Inlays and hanging flowers will affect the combing effect.
In order to meet the process design of “increasingly tight and strong carding” of carding distance, the form of needle planting should be reasonably selected to strengthen the transfer, and equipment management and maintenance measures should be strengthened. Effectively control elastic flat card clothing impurities.
In order to control the embeddedness of the elastic flat card clothing and improve the carding quality, the total height of the elastic flat card clothing should be reduced and the combing needles of the elastic flat card clothing should be increased. For angle planting, by using wedge-shaped needle point comb needles and increasing the comb needle density, improving the base fabric structure and raw steel wire cross-section, and strengthening process research, we can effectively control the elastic cover card clothing impalement. </p
