In recent years, the demand for dyeing and finishing of knitted fabrics has increased. In order to expand the market, woven fabric printing and dyeing enterprises have also made efforts to improve in various aspects of equipment, technology and management to meet the production and processing requirements of such products. Our company has achieved the production of knitted fabric printing through continuous efforts, and the output is increasing month by month. However, it is not easy to adapt the production of knitted fabric printing to the factory where the weaving printing is used. It is inevitable in the production process. There will be many problems. The following is a discussion of common rickets and prevention solutions in production.
1. Knitting semi-finished products are more likely to cause printing and knit fabric printing. Because of the large number of semi-finished products, the printing net is more common. This is because the pre-treatment process of knitted fabric and woven fabric is different, and the knitted fabric is not singeed. It is treated with mercerizing, and the fabric is relatively loose. Generally, it is pre-treated in the overflow machine cylinder. It is easy to fluff compared with the woven fabric, and it is easy to plug the net when the hair is printed. Solution:
(1) It is necessary to strengthen the quality inspection of knitted semi-finished fabrics, and to notify customers of the knitted semi-finished fabrics with poor quality, and agree on the treatment methods.
(2) When the semi-finished product is finalized, it is conceivable to add a bristle device, a blowing air blowing device, etc., and remove the cloth hair by a mechanical square.
(3) The printing machine is equipped with a dust-increasing device, and several adhesive nets are added to the printing machine to remove most of the hair.
(4) Adjust the process and increase the number of washings in time to minimize the number of hairs.
(5) Polishing enzyme auxiliaries are used for polishing treatment, but because the cost and risk of such treatment are relatively large, we are still only in the sample stage and have not been promoted.
2. Hole-breaking problems in knitted printed products The holes in knitted printed products may come from three possibilities: improper processing of knitted semi-finished products during processing, resulting in bleaching holes; hooks and hooks in the washing process of the cylinders, or opening The speed of the machine is too fast, causing mechanical abrasions, etc.; the push cloth is not clean, there are bamboo clips and other debris inside, and it is mixed into the cylinder to cause the hook to break. Solution:
(1) Carefully inspect the quality of the billet. In case of a gray cloth with many neps impurities, yarn breakage or yarn joints, it is necessary to promptly notify the customer to deal with it, because these problems are the root cause of the hole in the grey cloth, and timely notify Pre-processing to make the appropriate process adjustments. If there is a hole in the billet itself, it is necessary to prevent it from flowing into the next one.
(2) It is necessary to select a machined cylinder with smooth inner wall and good running performance, and the long-washed rope-shaped cylinder should be kept clean and smooth.
(3) It is to improve the responsibility of the operator. The car that turns the grey cloth should be cleaned, and the debris such as bamboo clips and nails should be strictly protected. The cleaning work of the pusher should be strengthened. After the printed cloth is washed, the speed of the opening speed should be appropriate to prevent accidents caused by excessively fast speeds, and it is too late to deal with mechanical damage.
3, the problem of insufficient weight of knitted finished products In general, customers pay more attention to the weight of knitted fabrics, it is also an important part of printing and dyeing enterprises to do the quality of knitted fabrics, whether the weight can be stable, whether it can reach customers The requirements are an important factor in the printing and dyeing enterprises' foothold in the knitting products market. In order to ensure the weight of each batch of knitted products, the following measures need to be taken:
(1) To check the quality of the grey fabric, the weight of the blank can generally reach the weight requirement of the finished product. However, if the weight of the semi-finished grey fabric does not meet the predetermined requirements of the finished product weight, the finished product is difficult to meet the weight requirement. Therefore, the weight of the semi-finished product is very important. Generally, the semi-finished product is required to measure the grammage of the semi-finished product before and after the predetermined type, so as to have a pre-estimation of the finished product weight.
(2) The fabric with spandex should be pre-prepared, which can stabilize the weight of the finished product.
(3) For the products that are not up to the standard, the factory first analyzes the reasons by itself, and then tries to change the process and operation. For example, the weight of the cotton spandex reaches the weight of the finished product, but it is often difficult to meet the expected weight requirement after the predetermined weight of the fabric, which is limited by the performance of the machine itself and related to the characteristics of the fabric itself. The predetermined weight is quite difficult. We have made some modifications in the process based on past experience and practice. The water is heated in the groove to make a predetermined type, which has a certain effect on the stability of the weight, and sometimes meets the customer's weight requirements. .
(4) Reasonable selection of mechanical equipment, process operation and dyeing chemicals. It is more common for the machine to lose weight due to its inherent tension and other properties. Therefore, the setting machine for knitting fabrics must be selected or appropriately modified, and the temperature of the drying room should be stable, and the performance of circulating air blowing and super feeding should be good. The addition of a steam jet at the front of the setting machine is also a measure of stability. According to the characteristics of the grey cloth, the development of a suitable pre-treatment process also plays an important role in ensuring the weight. It is necessary to select the application of the additive with less weight loss on the fabric. The variety of pre-treatment auxiliaries is uneven, and some auxiliaries are pre-treated too intensely, even injuring cellulose, causing unnecessary weight loss. Such auxiliaries should be avoided as much as possible. If the printing process is acceptable to customers, the coating printing process should be considered as much as possible to achieve the purpose of stability and even weight gain.
(5) Stereotypes Consider the best process to ensure the weight of the product. When the finished product is shaped, it can also add some additives such as urea to increase the weight, so as to make up for the problem of insufficient fabric weight.
4, the problem of anti-staining in washing.
Since the knitted fabric has not been subjected to mercerizing treatment, the dye is liable to fall off during the washing process to cause staining, so the anti-staining requirement of the white ground is higher. So we have to do:
(1) The color of the steamed hair should be fully and completely, so that the dye is fixed as much as possible. If the steaming is insufficient, the dye and the fiber are weakly fixed, and the dye is easily peeled off during washing, and the stain becomes more serious.
(2) For the chrome reactive dyes to be fully compared and selected, it is necessary to select excellent dyes with high lifting power and high fixing rate, so as to prevent the dyes from falling off and causing stickiness due to poor dye performance.
(3) It is necessary to choose a soaping agent with better anti-staining performance to minimize white soil contamination. The floating color should be cleaned, and the floating color is less likely to be stained when it is white.
(4) The water-eluting paste should be thorough, the cloth surface is not completely degraded, the finished product feels too hard, and the softener effect is not good, and the cost of finishing is increased, which may cause defective products. Therefore, we must pay attention to the formulation of the process and standardize the operation during the washing operation.
Knitting cloth printing will encounter many problems in the production process. The above only lists the most common types of rickets and makes a shallow analysis. To produce high-quality knitted printed fabrics, it also needs application in the process and equipment. The selection, operation management, and matching of the color separation network technology and other measures can be used to produce a first-class product.
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