Lok Feng: Good Management Of Equipment Is The Guarantee For Improving Carding Quality.

With the rapid development of spinning technology, High quality yarn More and more people are in favor of spinning enterprises in order to meet the needs of the latter customers and constantly improve their product quality. Carding machine is the heart of spinning process. As the core component of carding, card clothing has always been the focus of attention of the spinning mills. The modern carding machine can maintain high fiber combing rate by increasing the cylinder speed and adding carding elements on the thorn roller and the cylinder, so as to ensure high yield and good quality.

　　 Carding is the foundation of quality.

The modern carding machine is greatly improved because of the great accuracy of machinery manufacturing and assembly. High speed is no longer a problem. High yield is a logical thing. But all high speed and high yield must be under the premise of high quality, otherwise it can not be regarded as a high yield in real sense. Therefore, engineers and technicians should control the quality of carding machine by means of existing equipment, instrument detection and process optimization, so as to lay a good foundation for spinning high-quality yarn. The quality indicators of the carding machine affecting the rear track include weight of raw strips, evenness, evenness, neps, noil, short and coarse yarn defects. To achieve carding quality, it depends on the mechanical and carding function of the carding machine.

　　 Carding Process quality control should focus on the separation of fibers and break the fiber bundles into a single fiber state. The fiber is highly separated and the proportion of the spun fibers is large. The sufficient separation of fiber and impurity is the precondition of removing impurity. A good fiber state ensures that the fibers are more mixed. The fiber is straight, with a large amount of droppings and short fiber. It ensures that fibers are not entangled or entangled in the drawing process, and the neps are less.

Carding process is basically the last procedure of removing impurities from carding process, so it is necessary to remove neps and impurities as much as possible. When producing combed varieties, the carding process is also related to the combing process. This is the reason why the short staple rate of the blowing carding unit is higher than that of the combed variety, and the combing is smaller than the combing. At the same time, it is also very close to lightening combing burdens and achieving efficient combing. The removal efficiency of cotton neps and the increase extent of the carding machine have great influence on the quality of the rear track.

With the increase of the output of high-yield carding machine, the problem of decreasing quality (such as neps and strength) has become increasingly prominent. Short staple rate is closely related to yarn quality. Short staple increased, the proportion of spinnable fiber was less, the sliver will deteriorate, the yarn often increased yarn defects, flying flowers increased, sticky and hang up more, so that short coarse yarn occasional yarn defects increased (100 thousand meter yarn defects), some experts believe that every 3% increase in short linen, dry CV deteriorated 1%.

　　 Strict implementation of maintenance plan

In order to ensure the quality of yarn to meet the needs of high-end customers, it is necessary to standardize the specifications of the carding process and provide an effective basis for controlling carding quality. At the same time, we should make sure that the quality of the front road is the prerequisite and foundation for yarn quality. Only by ensuring the quality of carding can we ensure the stability and improvement of the quality of semi finished products and yarn quality. There are many methods of quality control in carding process, and each spinning enterprise should take corresponding measures according to the characteristics of their respective enterprises. Our company starts from equipment maintenance, process adjustment, strengthening combing, standardizing operation and controlling temperature and humidity, so as to ensure effective control of carding quality.

Equipment maintenance is the premise of quality control. The maintenance of the equipment needs systematization. Our company makes full use of advanced testing instruments to track the carding platform to ensure that the machines and equipment are in the best maintenance cycle.

Because Carding machine There are differences in the design structure and mechanical properties between each carding machine. For example, there are some differences between the new high-speed carding machine and the old carding machine. The mechanical properties of the blowing carding machine are different from that of the traditional cotton rolls. There is a certain difference in the manufacturing accuracy between the carding machine of the same manufacturer and the same type. Therefore, the advanced USTER AFISPRO instrument is used to detect the NEP and short pile index of the machine, and a more practical and practical dynamic maintenance schedule is formed according to the index situation.

Under the general maintenance plan of the carding machine, 80 carding machines in the spinning workshop of the company are in the periodic maintenance plan, and the corresponding maintenance cycle is also set for the carding parts of each trolley. For example, comparing the test data before and after the cover plate, it is found that the carding condition is obviously improved after regular maintenance.

The company's original carding machine maintenance cycle is to wipe the car once per month. Xiaoping has one car per year. After a year of groping and tracking, the company finds out a reasonable maintenance cycle method, which is to set up a random and regular carding machine maintenance cycle based on the AFIS NEP count and short fiber content index of each single test. According to the index and the condition of the car, it is necessary to determine whether to maintain the vehicle platform, and establish the equipment maintenance and equipment allocation ledger for each card.

The key quality data tracking of existing carding machine is carried out. For example, according to the change of NEP number and short pile content in the sliver, the carding machine with poor index is analyzed in time, and the maintenance plan is established to ensure that every card is always in the best condition and the quality of the sliver is stable. This can solve the problem in a targeted way, saving manpower and financial resources, and reducing unnecessary waste. The company establishes a histogram for each carding machine (with the same type and type). It can be seen from the histogram that the carding machine is in poor condition and should be included in the maintenance plan.

　　 The condition of the machine must be tracked for a long time.

But what we should remind here is that we can not judge the condition of a carding vehicle by one or two times data, and we must pass the average statistical value of the test data several times. Because the randomness and volatility of the one or two data are very large. After using the production process (NEPs) control chart, the quality of the sliver is effectively controlled, ensuring that the carding process is in the best processing control state. At the same time, the NEP tracking of each single carding machine can determine the best maintenance cycle, so as to effectively stabilize the carding quality and improve the efficiency of the carding machine.

The quality is relative, because it is compared with the control standard, so how is the control standard formulated? Take neps as an example, the company decides according to two aspects. First, carding machine in carding workshop is NEP (grain /g). At least 1 times a week for all carding machines, and 3 months' results were used to determine the neps average in the carding workshop. The two is different spinning systems. In ring spinning, the number of fiber neps of coarse yarn and medium count yarn should be lower than that of the same number of rotor spinning, which is due to the different forming methods of the yarn in the two spinning systems. For fine count yarns, ring spinning and rotor spinning systems should be kept at the same level.