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1. Decreasing tension while refined bleaching.
2. During dyeing and finishing process, drying every cloth need to loose the tension, reduce the elongation for avoiding over-shrink the width, if it is a scutching continuous heating machine, the fabric need a small fabric container then threading into frame after scutching, to avoid too much tension between scutching and squeezing.
3. During mercerizing, expanding tension need to be controlled for keep width of grey fabric, and weft elongation need to be noticed.
4. After mercerizing, the tension in post-processing need to be tight controlled for the product, because mercerized and elongated weft shrinkage rate can be customized by semi-finished product index in every process, fabric in every machines need be measured, post-processing need to check the former process, for ensure the semi-finished product due width.
5. In every process, suppress washing machine, twitch roller, compression roller and drying cylinder need to be checked and well maintained for keep them smooth and clean. Avoid fabric wrinkle after tension loosed, twitch roller in sink should be well operating, in one machine, line speed of front roller and back roller should not a big difference, warp tension should not let the fabric touch the floor, there should be a tightness adjustment device or a partitioned transmission adjustment device for controlling the tension while long-machine subsection.
6. For some machinery tension need to be controlled by manual, standardize tech operations, strengthen tech operation, strengthen machine cleaning, reduce operation tension, reduce the fabric shrinkage rate effectively.
7. Strengthen checking the mercerizing tech condition, conditional dye-works can use straight roller and clip for mercerizing.
8. Fabric kind which have a big weft shrinkage rate, such as khaki, gabardine and poplin need a preshrunk process, for reducing shrinkage rate. In tight producing, these fabric kind can reach the 4% shrinkage rate best, if only rely on loosing mechanical tension, this shrinkage rate should take preshrink process for more reduction, after preshrink process, the product got better shrinkage and better hand-feeling, even the grains become clear and soft.
9. For fabric kind got a big weft shrinkage rate, some cannot get a good weft shrinkage rate in reasonable condition for unreasonable width of grey fabric, it is worse in bad producing condition, this situation need a improvement approaching. Mercerization kind need to prove the fabric width meet the requirement. Otherwise the grey fabric's specification need to be improved, broaden the width of grey fabric for ensuring weft shrinkage rate reduce to requirement range.
10. Resin finishing can reduce shrinkage and provide better elasticity ( hand feeling need to be noticed ), and coating can also reduce shrinkage.
11. For T/C synthetic blending fabric, the mercerizing process technology and operation an control the shrinkage.
By yulong tex
Wiki User
∙ 8y ago
puppycat
Hand washing and air drying helps
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Why do shrunk finish to the cotton fabric?
The cellulose fiber fabric can breathable moisture absorption,good performance,But the shrinkage rate is big,often bring inconvenience to consumers.But after the shrunk finish,the warp direction of the fabric can shrink in advance,thus lower the shrinkage rate of the finished fabric,to meet the quality requirements of garment processing. The international market usually have requirement to the high-grade products about the warp and weft shrinkage rate,but the commonly used preshrinking machine,have no shrinkage effect to the fabric weft.The high-grade products in order to ensure the shrinkage rate of weft can meet requirement,before the fabric entering the preshrinking machine,must be complete the weft preshrinking,general it is fit doing in Singeing, sizing process,appropriate to increase the fabric warp elongation,have the effect of cloth width contraction,to ensure the products that after preshrinking finishing can meet the double shrinkage requirement. By yulong tex
Injection speed?
Resin pressure Resin pressure has a great influence on the shrinkage rate. If the resin pressure is large, the shrinkage rate becomes smaller and the size of the product is larger.Even in the same mold cavity, the resin pressure varies depending on the shape of the product, so the shrinkage rate varies.
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A quality T-shirt should experience minimal shrinkage after the first washing.
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Shrinkage in a mold is an important consideration when creating a plastic product. Certain materials shrink more than others. For example, semi-crystalline materials shrink more than amorphous materials. It is useful to know the shrinking window of your mold before choosing a mold maker. A lower shrink window means that the part will be easier to shrink, while a higher shrink window means that the part will be more difficult to shrink. Managing shrinkage in a Mould While it’s impossible to eliminate plastic injection molding shrinkage during the mold engineering process, there are steps you can take to minimize its impact. First, consider what causes plastics to shrink. All plastics shrink as they cool, but the rate of shrinkage differs from material to material. For this reason, controlling mold shrinkage is critical. Mold engineers need to adjust the process settings to minimize shrinkage. The goal is to achieve low shrinkage across a wide region of a part while maintaining a high degree of uniformity. This is a complex challenge that requires careful consideration of temperature, molecular and fiber orientation, and different packing levels. However, several solutions can be found to minimize shrinkage and achieve close tolerances. The temperature of a injection mold plays a significant role in determining shrinkage. A hot mold will experience less shrinkage than a cold one. A cold mold allows the plastic to solidify too early, causing it to shrink before the injection pressure is fully applied. A hot mold, on the other hand, allows plastic molecules to move and compress before they solidify. In turn, this results in less shrinkage. A 10% change in injection mold temperature and moisture content can lead to a 5% reduction in shrinkage. Calculating shrinkage in a Mould The first step when designing a mold is to determine the shrinkage of the material. There are two ways to calculate this. The first is to divide the part size by the injection mold linear dimension. The second method is to divide the part size by the material shrinkage and multiply the result by the ratio of the two. In both cases, the difference between the dimensions increases as the shrinkage amount increases. Calculating the shrinkage of plastics is not an easy task. This is because shrinkage is related to both the material and the production process. The amount of shrinkage that a plastic material will experience depends on the temperature and the rate of cooling. The shrinkage will be greater in one direction than the other, which means that it is important to set a wide shrinkage tolerance. Once you know how much shrinkage your mold will experience, you can then calculate the shrinkage of your plastic pieces. This injection molding process is known as injection molding shrinkage and it affects designers of injection molded products and molds alike. Plastic shrinkage occurs affects the part’s linear dimensions. However, it varies between different polymers.
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The injection molding process is complex and requires precise control to achieve the desired level of shrinkage. To optimize the plastic injection molding process, it is important to understand the factors that affect shrinkage. These factors include melt temperature, cooling rate, mold temperature,ure, and gate size. By controlling these variables, it is possible to achieve the desired level of shrinkage. It is also important to use a high-quality release agent to prevent sticking and to ensure consistent surface quality of the finished product. By following these tips, it is possible to optimize the injection molding process and achieve the desired level of shrinkage.
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