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 companies also strive to improve in equipment, processes, and management to meet the production and processing requirements of such products. After continuous efforts, our company has realized the production of knitted fabric printing, and the output has increased month by month. However, it is not easy for a factory used to printing woven fabrics to adapt to the production of knitted fabrics, and it is difficult to avoid the production process. There will be many problems. The following discusses common defects and preventive solutions in production as follows.
1ã€Knitted semi-finished products are more likely to cause printed ç–µKnitted cloth printing. Because the semi-finished products have many hairs, the printing plug mesh is more common. This is because the pre-treatment process of knitted fabrics and woven fabrics is different. Knitted fabrics are not singed out. And mercerizing, and the fabric is loose, generally in the overflow cylinder for pre-treatment, compared with the woven fabric is easy to fluff, more hair when the printing is easy to plug the net. Solution:
(1) It is necessary to strengthen the quality inspection of knitted semi-finished fabrics, and notify customers in a timely manner of the quality of knitted semi-finished fabrics that are not of good quality, and agree on treatment measures.
(2) When setting the semi-finished product, it may be considered to install a brushing device, a blower, etc., and remove the cloth head through the mechanical part.
(3) The printing machine feeds into the cloth to strengthen the dust collection device. A few sticky nets are installed on the printing machine to remove most of the feathers.
(4) Adjust the process and increase the number of washings in a timely manner to minimize the size of the hair.
(5) The use of polishing enzyme additives for polishing, but because of the relatively large cost and risk of such treatment, so we are only at the sample stage, there is no promotion.
2. Holes in Knitted Printed Products Holes in knitted printed products may come from three possibilities: improper pre-treatment during the processing of knitted semi-finished products, resulting in bleached holes; hooking and snaking, or opening when the machine cylinder is washed The speed of the machine is too fast, causing mechanical abrasions, etc.; the pushing car is not clean, there are bamboo clips and other debris, and it is mixed into the cylinder to cause breakage. Solution:
(1) Carefully inspect the quality of the incoming blanks. In the case of greige with many nep impurities, yarn breakage or yarn joints, we must promptly notify the customer to deal with them because these problems are the root causes of the holes in the grey fabrics and they are promptly notified. Pre-processing to make the appropriate process adjustments. If there is a hole in the blank itself, we must stop it from flowing into the next one.
(2) Select cylinders with smooth inner walls and good running performance to handle knitted fabrics. Wash the rope cylinders with a long trolley to keep them clean and smooth.
(3) It is to improve the responsibility of the operator. The car that turns the fabric must be cleaned, and the debris, such as bamboo clips and nails, should be prevented from entraining them. The cleaning work of the pusher should be strengthened. After the printed cloth is washed, the open speed of the open screen should be appropriate to prevent the mechanical damage from being damaged due to the accidental occurrence of excessive speed.
3. Insufficient grammage of knitted fabric products In general, customers pay more attention to the grammage of finished knitted fabrics, and it is also an important aspect of the quality of knitted fabrics for printing and dyeing companies. Whether grammage can be stable and the weight can reach customers The requirement is an important factor for printing and dyeing companies to establish themselves in the knitting product market. In order to ensure the weight of each batch of knitted fabrics, the following points need to be taken:
(1) To inspect the quality of the grey fabric, generally, the billet weight can reach the grammage requirement of the finished product, but if the grammage of the semi-finished fabric does not reach the predetermined requirement of the finished product's grammage, the final product can hardly reach the grammage requirement. Therefore, the grammage of semi-finished products is very important, and semi-finished products are generally required to determine the grammage of the semi-finished products before and after the predetermined type, so as to have a pre-estimate of the finished product grammage.
(2) The grey fabric with spandex should be pre-prepared so that it can stabilize the grammage of the finished product.
(3) For products that do not meet standard billet weight, the factory analyzes the cause first, and then tries to change the process and operation. For example, the full weight of cotton spandex is required to reach the weight of the finished product, but it is often difficult to achieve the expected grammage after the predetermined grammage, which is limited by the performance of the machine itself and the characteristics of the fabric itself. The pre-determined grammage is quite difficult, and we have made some modifications in the craftsmanship based on past experience and practice. Heating the water in the troughs to make a pre-determined type has a certain effect on stabilizing grammage, and sometimes it also meets the customer's grammage requirements. .
(4) Reasonable choice of mechanical equipment, process operation, dyeing and auxiliary agents. It is more common for the machine to cause grammage failure due to its inherent tension and other properties. Therefore, the styling machine of the knitted fabric is selected or undergoes appropriate transformation. The temperature of the drying room is required to be stable, and the cycle blow and overfeed performance are better. The increase of steam jets ahead of the shaper is also a measure of stability. According to the characteristics of the grey fabric, formulating a suitable pre-treatment process also plays an important role in ensuring the grammage, and it is necessary to choose the auxiliaries with less weight loss on the fabric as much as possible. Variety of pretreatment auxiliaries are of varying quality, and some auxiliaries are pre-treated to be excessively intense and even injure cellulose, causing unnecessary weight loss. Such auxiliaries should be avoided as much as possible. If the customer can accept the printing process, he should consider choosing paint printing process as far as possible, which can achieve the purpose of stabilizing or even gaining weight.
(5) Stereotypes consider using the best process to ensure the grammage of the product. When the finished product is shaped, it can also add some auxiliaries such as urea to increase the weight, which has made up for the lack of fabric weight.
4, anti-staining problem in washing.
Since knitted fabrics have not been treated with mercerization, the dyes tend to fall off during the washing process and cause staining, so the anti-staining requirements of white fabrics are higher. So do:
(1) The coloration of the steaming should be fully completed, and the dye should be fixed as much as possible. If the steaming is not sufficient, the fixing force of the dye and the fiber is weak, and the dye is easily peeled off during the washing, and the contamination will be more serious.
(2) To fully compare and select the reactive dyes in the tint, it is necessary to select excellent dyes with strong lifting power and high fixing rate to prevent sticking due to poor dye performance.
(3) It is necessary to choose a soap lotion with good anti-staining properties to minimize white soiling. The floating color should be washed cleanly, and the floating color should be less contaminated when the soap is washed.
(4) The water elutes the paste thoroughly, the fabric is not fully de-pasteable, the finished product feels too hard, and the effect of adding more softener is also not good, and the cost of the post-finishing increases, and also causes the occurrence of defective products. Therefore, the washing process must pay attention to the development of the process, standard operation.
Knit fabric printing problems encountered in the production process there will be many, the above listed only the most common types of rickets made shallow analysis, to produce high-quality knitted calico, but also in the process of application, equipment The measures of selection, operation management, and support of color separation system are all measures that can produce products that are top-notch.
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 companies also strive to improve in equipment, processes, and management to meet the production and processing requirements of such products. After continuous efforts, our company has realized the production of knitted fabric printing, and the output has increased month by month. However, it is not easy for a factory used to printing woven fabrics to adapt to the production of knitted fabrics, and it is difficult to avoid the production process. There will be many problems. The following discusses common defects and preventive solutions in production as follows.
1ã€Knitted semi-finished products are more likely to cause printed ç–µKnitted cloth printing. Because the semi-finished products have many hairs, the printing plug mesh is more common. This is because the pre-treatment process of knitted fabrics and woven fabrics is different. Knitted fabrics are not singed out. And mercerizing, and the fabric is loose, generally in the overflow cylinder for pre-treatment, compared with the woven fabric is easy to fluff, more hair when the printing is easy to plug the net. Solution:
(1) It is necessary to strengthen the quality inspection of knitted semi-finished fabrics, and notify customers in a timely manner of the quality of knitted semi-finished fabrics that are not of good quality, and agree on treatment measures.
(2) When setting the semi-finished product, it may be considered to install a brushing device, a blower, etc., and remove the cloth head through the mechanical part.
(3) The printing machine feeds into the cloth to strengthen the dust collection device. A few sticky nets are installed on the printing machine to remove most of the feathers.
(4) Adjust the process and increase the number of washings in a timely manner to minimize the size of the hair.
(5) The use of polishing enzyme additives for polishing, but because of the relatively large cost and risk of such treatment, so we are only at the sample stage, there is no promotion.
2. Holes in Knitted Printed Products Holes in knitted printed products may come from three possibilities: improper pre-treatment during the processing of knitted semi-finished products, resulting in bleached holes; hooking and snaking, or opening when the machine cylinder is washed The speed of the machine is too fast, causing mechanical abrasions, etc.; the pushing car is not clean, there are bamboo clips and other debris, and it is mixed into the cylinder to cause breakage. Solution:
(1) Carefully inspect the quality of the incoming blanks. In the case of greige with many nep impurities, yarn breakage or yarn joints, we must promptly notify the customer to deal with them because these problems are the root causes of the holes in the grey fabrics and they are promptly notified. Pre-processing to make the appropriate process adjustments. If there is a hole in the blank itself, we must stop it from flowing into the next one.
(2) Select cylinders with smooth inner walls and good running performance to handle knitted fabrics. Wash the rope cylinders with a long trolley to keep them clean and smooth.
(3) It is to improve the responsibility of the operator. The car that turns the fabric must be cleaned, and the debris, such as bamboo clips and nails, should be prevented from entraining them. The cleaning work of the pusher should be strengthened. After the printed cloth is washed, the open speed of the open screen should be appropriate to prevent the mechanical damage from being damaged due to the accidental occurrence of excessive speed.
3. Insufficient grammage of knitted fabric products In general, customers pay more attention to the grammage of finished knitted fabrics, and it is also an important aspect of the quality of knitted fabrics for printing and dyeing companies. Whether grammage can be stable and the weight can reach customers The requirement is an important factor for printing and dyeing companies to establish themselves in the knitting product market. In order to ensure the weight of each batch of knitted fabrics, the following points need to be taken:
(1) To inspect the quality of the grey fabric, generally, the billet weight can reach the grammage requirement of the finished product, but if the grammage of the semi-finished fabric does not reach the predetermined requirement of the finished product's grammage, the final product can hardly reach the grammage requirement. Therefore, the grammage of semi-finished products is very important, and semi-finished products are generally required to determine the grammage of the semi-finished products before and after the predetermined type, so as to have a pre-estimate of the finished product grammage.
(2) The grey fabric with spandex should be pre-prepared so that it can stabilize the grammage of the finished product.
(3) For products that do not meet standard billet weight, the factory analyzes the cause first, and then tries to change the process and operation. For example, the full weight of cotton spandex is required to reach the weight of the finished product, but it is often difficult to achieve the expected grammage after the predetermined grammage, which is limited by the performance of the machine itself and the characteristics of the fabric itself. The pre-determined grammage is quite difficult, and we have made some modifications in the craftsmanship based on past experience and practice. Heating the water in the troughs to make a pre-determined type has a certain effect on stabilizing grammage, and sometimes it also meets the customer's grammage requirements. .
(4) Reasonable choice of mechanical equipment, process operation, dyeing and auxiliary agents. It is more common for the machine to cause grammage failure due to its inherent tension and other properties. Therefore, the styling machine of the knitted fabric is selected or undergoes appropriate transformation. The temperature of the drying room is required to be stable, and the cycle blow and overfeed performance are better. The increase of steam jets ahead of the shaper is also a measure of stability. According to the characteristics of the grey fabric, formulating a suitable pre-treatment process also plays an important role in ensuring the grammage, and it is necessary to choose the auxiliaries with less weight loss on the fabric as much as possible. Variety of pretreatment auxiliaries are of varying quality, and some auxiliaries are pre-treated to be excessively intense and even injure cellulose, causing unnecessary weight loss. Such auxiliaries should be avoided as much as possible. If the customer can accept the printing process, he should consider choosing paint printing process as far as possible, which can achieve the purpose of stabilizing or even gaining weight.
(5) Stereotypes consider using the best process to ensure the grammage of the product. When the finished product is shaped, it can also add some auxiliaries such as urea to increase the weight, which has made up for the lack of fabric weight.
4, anti-staining problem in washing.
Since knitted fabrics have not been treated with mercerization, the dyes tend to fall off during the washing process and cause staining, so the anti-staining requirements of white fabrics are higher. So do:
(1) The coloration of the steaming should be fully completed, and the dye should be fixed as much as possible. If the steaming is not sufficient, the fixing force of the dye and the fiber is weak, and the dye is easily peeled off during the washing, and the contamination will be more serious.
(2) To fully compare and select the reactive dyes in the tint, it is necessary to select excellent dyes with strong lifting power and high fixing rate to prevent sticking due to poor dye performance.
(3) It is necessary to choose a soap lotion with good anti-staining properties to minimize white soiling. The floating color should be washed cleanly, and the floating color should be less contaminated when the soap is washed.
(4) The water elutes the paste thoroughly, the fabric is not fully de-pasteable, the finished product feels too hard, and the effect of adding more softener is also not good, and the cost of the post-finishing increases, and also causes the occurrence of defective products. Therefore, the washing process must pay attention to the development of the process, standard operation.
Knit fabric printing problems encountered in the production process there will be many, the above listed only the most common types of rickets made shallow analysis, to produce high-quality knitted calico, but also in the process of application, equipment The measures of selection, operation management, and support of color separation system are all measures that can produce products that are top-notch.
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