1. Improper fabric process design and configuration (1) Improper selection of the pen number: After the total number of pens is determined, the layout and compression of the finished product must ...
1. Improper fabric process design and configuration
(1) Improper selection of the pen number: After the total number of pens is determined, the layout and compression of the finished product must meet the requirements, and an appropriate pen number must be selected. The decision on the number of the pen must first determine the weft shrinkage rate, and there are many cables that affect the weft shrinkage rate. Therefore, before the product is officially put into production, several box numbers should be used for trial weaving. Under certain production conditions, determine a suitable reed number. If the pen number is selected incorrectly. After formal production, a large number of defective cloths such as narrow width reduction will occur, or the width is too wide and cannot meet the requirements of the secret. In actual production, it is often found that after the total number of meridians calculated by formulas is determined, the web and meridians cannot meet the standards at the same time. This is because meridians are prone to errors in the test and cannot be obtained with the meridians specified by the fabric. To. Therefore, in actual mastery, we must also consider the requirements after the finished printing and dyeing product, and try to make the fabric close to the standard.
(2) Improper slurry size selection: The length of the fabric is generally determined by the length of the slurry ink mark, but it is often affected by the warp shrinkage. Before the product is put into production, while testing the weaving and determining the reticle, the length of the cloth must be tested to determine the appropriate length of the slurry ink mark. If the product is not selected properly, it will cause a large number of long and short code defects.
2. Poor temperature and humidity adjustment. During the weaving process, the web is very sensitive to too dry or too wet. Usually the temperature is too high and the width is narrow. In general, the length of the cloth is long; the humidity is too low, the width of the cloth is wide, and the length of the cloth is short. Due to the relative humidity, the warp yarns are subject to changes in moisture recovery and moisture absorption and moisture release. Influences the warp and weft shrinkage. Therefore, in winter and summer, when outdoor wet bulb temperature changes drastically, it is easy to cause changes in the length and width of the workshop.
3. The quality of the slurry semi-products
(1) There are a lot of yarns on the edge of the entire warp shaft, causing a large number of yarns on the edge of the slurry to be twisted and loose yarns to be broken. The loom cannot weave it, so a large number of yarns are pulled away. Border yarn. Form a narrow web
(2) Slurry printing, misprinting, reprinting, and no printing.
① The slurry printing device is damaged, the ink print length is incorrect, resulting in random printing or missing printing, resulting in the fabric length not meeting the regulations.
②The slurry car is turned on or the variety is changed, and the vehicle is not operated carefully, causing the code division table to be wrong, and not discovered in time, resulting in a large number of long and short codes.
(3) The difference in sizing elongation, moisture retraction and sizing rate is too large. Influences warp shrinkage.
① The slurry is too long and has a small retraction ability after forming a cloth, which is easy to produce narrow or short codes.
②The slurry rebate rate is less than or close to the range of moisture rebate that the cotton cloth can maintain. Then the length of the cotton cloth will grow longer with the increase of the slurry moisture retrieval and the width will become narrower. If the slurry moisture retrieval exceeds the range of moisture retrieval that the cotton cloth can maintain, the slurry moisture retrieval will increase, which will cause the cotton cloth to become shorter. code and narrow. The sizing rate of the paddle yarn is too large and the diameter of the warp yarn is large. After weaving with a woman. The warp yarn buckling wave increases, which can easily produce short codes; conversely, the sizing rate is low and the reduction is likely to produce long codes.
4. Poor function of some mechanisms and components of the loom
(1) Poor effect of side support: The gap between the side support box cover and side support seat is too large, or the type of thorn roller used is improperly extended Amplitude effect shadowHighly loud. Poor stretching effect will produce narrow cloth.
(2) The mechanical condition of the transmission and installation is abnormal:
(1) The felt inside the transmission and the gear is old and slippery, the brake disc (B2I) is too bright, the transmission and the gear support (B23, B24, B25) is worn out or has poor effect, and the tension fan rod (C3) is too smooth, etc., which will produce narrow and long codes.
(2) The loom tension heavy hammer (C17) is not adjusted in time, the tension is too large, and the fabric surface is too tight. Generate narrow and long codes.
5. The tension of the weft yarn is too high or the tide is low. Affects the normal width of the fabric
(1) The number of roads on the head of the shuttle is tensile and the number of steel wires is relatively large, which makes the weft yarn unwinding and twisting, and the tension is large, causing the fabric to become narrower.
(2) The weft yarn is not wet and the moisture is low. If the twist is unstable, the market size will become narrower after weaving; the weft yarn will be wet, the tide will be high, the twist will be stable, and the width will be wide.
6. Poor management causes short codes
(1) The machine has not weaved the ink print.
(2) Too much tear off the machine or the head of the machine in the sorting workshop.
(3) The folding width of the folding cloth sail does not meet the standards.
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