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Card Doffer Speed

Author:Xinjinlong Machinery-Fabric Recycling Machine Manufacturer

The card doffer is directly related to the speed of the card's productivity. Carding machines are used to process cotton fibers and chemical fibers and belong to textile machinery. According to the spinning process, carding is an important process.

The front process of the carding machine is the opening and cleaning machine, and the latter process is the drawing frame (carding process) or the sliver coiler (combing process). 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. Special equipment for the textile industry on the winder.

As the last process of spinning and the first process of weaving, winding is the link between the past and the next.“bridge”Therefore, it occupies an important position in the textile field. The internal comb in the range of Doffer reduced speed increases the efficiency and can improve the quality of the cotton web, but it will lead to lower productivity and noil rate, so it is not economical. Doffer increases the speed, which can improve the productivity, but it must be compatible with the speed of the cylinder, the licker-in, etc. and related processes to achieve a certain carding and cleaning effect to ensure quality.

Doffer at high speed, which will affect the quality of the cotton web. Doffer speed must be selected in accordance with the quality and dosing laps considered finished product needs, effectiveness of carding and cleaning cards and other factors. The doffer speed of the ordinary carding machine is 10 rpm when left and right, and the rotation speed of the shredder is 1200 times/min.

Since the swing frequency and a chopper usually do not exceed 1600 rpm, this limits the speed of the doffer to no higher than 16 rpm or higher. If some improvements to the chopper mechanism, such as chopping pot-to-pot rolling chopping, chopping in two teeth as well as one tooth, for a tooth depth of 2mm to 8mm, the chopping speed can be increased to close to 2000 times/min , and then, if the chopper is increased and the swing position is properly chopped down, the stroke of the swing shortens the idling, 20-23 rpm elbow doffer speed, and still strips the wool. Production cards employing means of stripper rolls are preferred, and the doffer speed can be increased to 35 rpm, or even higher.

Improve Productivity Carding both and wiping, which is the speed of strengthening and increasing doffer sliver basis. Cards currently produced, by using cylinders, and licker-in metal line speed measures, new flat clothing, carding enhancements, load relief and cover needle cylinder surface to enhance fiber tip and transfer float, and can withstand larger carding power, thus both increasing the speed of the doffer and increasing the basis weight of the sliver. For A186, the doffer speed of the carding machine is generally 23-30 rpm, which is 20-30% of the sliver of ordinary quantitative card.

Its quantification is also not too bright, such as quantitative less than 20g/5m, which often leads to high yields of edge damage to cotton mesh cards, increasing the breakage rate. However, in ordinary cord carding machines, the situation of the carding machine is different. Combing its different conditions, taking into account the improved productivity of elbow cards, such as the same yield, in order to take quantitative and preferably higher doffer speed slightly lighter.

This is because: 1. When other conditions are the same, whether it is used to increase the speed of the fruit doffer to do rubbing, or a method to increase the number of sliver numbers, the quality of the net decreases. 2. When the number of ways to increase the sliver count is adopted, the cotton net drops more and more quality, and the rate of the cover taken increases. Because the number of yarn sliver increases, the amount of fiber between the cylinder heads increases, so the increase of the fiber layer in the pressure range affects the performance of carding, and the card sliver increases.

Due to the increased load, insufficient and excessive fiber carding clothing fills, making every sentence of the semi-finished product, and straight down. At the same time, since the cylinder doffer needs to transfer more fibers, the limited number of fiber needle doffer teeth can maintain the surface, thereby reducing the transfer rate.


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