The feeding system in the carding machine plays a crucial role in yarn manufacturing. It regulates the delivery of fibers to the carding zone, improving the carding machine’s efficiency, quality, and productivity. Modern feeding systems offer greater precision and control, allowing textile manufacturers to improve the quality of their yarns and improve the efficiency of their production process with advanced technology. There are two types of feeding system in carding machine. One is lap feed system and other is chute feed system. In this article, we will learn advantage and disadvantage of chute feed system. Today’s, Chute feed system is used in modern blow room line. This system is continuous process. As it is continuous process, it has advantage of higher productivity and low variation in quality of feed materials.
Principle of Chute Feed System:
Cotton fibers are fed directly from the blow room to a series of cards through a pneumatic pipe through chute feed in carding.
Material from the blow room is sucked into a condenser in the pneumatic pipe, which is delivered to the flock feeder via pneumatic pipe via the filling trunk. A photo electric cell in the filling trunk regulates the material supply from the blow room. The material is fed through the two ridged rollers and two feed rollers to the Krischner beater, which opens the cotton to the desired size tufts. A fan blows the tufts from the Kirschner beater into a horizontal closed circuit loop situated above the cards. As well as returning surplus material to the beater after the last card has been supplied, the return trunk should also unite well opened material with fresh material, which is then delivered directly to the horizontal duct. The separating head arranged in the horizontal closed circuit loop diverts the part of tufts from air current into vertical feed chutes above the card inlets. Using a vertical feed chute ensures uniform material supply across the entire working width of the card. A uniform separation of the tufts from the air current is achieved by adjusting the nose in the separating head. Raising the leading edge leads to greater separation. In the installation, the static excess pressure varies from separator to separator by about 2mm head of water, affecting the weight of the card feed per meter. As a result of this drop, the weight of the feed per unit length should be adjusted by increasing or decreasing the distance between the glass front and the rear wall of the feed chute. It weighs between 600 and 700 grams per meter.
Advantage of Chute Feed System:
- working efficiency in blow room: As a result of the automatic and continuous feeding of tufts from the blow room directly to the card frame, a higher level of working efficiency is achieved due to the elimination of manual work on lap formation. we can say, in chute feed system working efficiency in blow room is higher than lap feed system.
- less man power: It can be seen that with lap feed systems, extra manpower is required for lap doffing, lap weighing, lap transporting, and lap feeding to card frames. On the other hand, chute feed systems, i.e. automatic and continuous tuft feeding systems will not require such extra manpower.
- less wastage and higher material realization: With chute feed systems, there are no lap rejections or processing wastages, hence producing a higher material realization rate due to the absence of lap rejections.
- operational efficiency in card frame: A chute mat has looser tufts than a lap, and this loose tufting produces improved operational efficiency (such as opening and cleaning cards in card frames) due to this loose tufting.
- Longer working life: As a result, the additional load on the carding rollers caused by the compressed lap structure and a higher level of trash particles is eliminated. As a result, the life of the card rollers has been extended.
- Less extra process cost: In a lap feed system, rejected laps are reprocessed, so extra processing costs are incurred as a result. In this sense, chute fed systems do not have these added processing costs as they do not require reprocessing your laps.
- Reduction floor space: Due to the elimination of the lap formation machine from the chute feed system, there is less floor space required for the system.
- Working efficiency in card frame: As a result of eliminating card stoppage caused by frequent lap changes and lap breakage in chute feed system, working efficiency in card frame increases due to reduced card stoppage.
- CVm% of card sliver: There is a higher CVm% of card sliver in chute feed systems than in lap feed systems.
Disadvantage of Chute Feed System:
- It is less flexible to optimize the production line with chute feed systems because they are less flexible.
- There is not a leveling of the medium-term or long-term variation in mass.
- There will be more waste in the chute feed system as a result of the change in lot mixing.
- There will be a decrease in card production during the BR maintenance period.
- Using the lap forming system, a reliable check on nominal count can be made by controlling lap weight and C.V. value of the weight per unit length. This is not possible with chute feeding.
In the blow room, chute feeds are an integral part of the yarn manufacturing process. For the goal of achieving optimal yarn quality and production output, it facilitates seamless fiber transfer, promotes uniformity, and enhances efficiency.
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