1. Characteristics of elastic spandex yarn for hygiene products
The elasticity of the elastic parts of sanitary products is related to its dosage and elastic modulus. Even though different manufacturers have the same specifications, the tension and elasticity are not exactly the same. The modulus is related to its formula and production process. Generally, the elastic modulus is high, and the resilience and elastic recovery rate are also relatively high. High modulus of elasticity is more cost-effective than low modulus of elasticity - less dosage and lower residual deformation. A low elastic modulus has a higher stretch and a more stable rebound force curve.
2. The stretch ratio of elastic spandex yarn for hygiene products
The maximum stretch rate of spandex yarn is more than 5.0 times, and the general effective stretch is 2.5~3.5 times. Comparing the stress/strain curves of different stretch ratios, it is found that there is no significant difference in the wearing elasticity of different stretch ratios.
3. The elastic comfort of spandex yarn and the balance of close-fitting and leak-proof
Physical activities require close-fitting and comfortable protection. An ideal elastic material should have a stable rebound curve and be able to provide a good fit for users of different sizes. So that the absorbent core can play a better effect.
If the elstic spandex yarn has high resilience, it can increase the absorption time of the core and effectively prevent leakage. Reduce the risk of side leakage. But surface wrinkles can easily cause skin scratches and discomfort.
4. Spandex yarn application process and problem countermeasures - unwinding and tension control
All spandex yarns are packaged in round tubes. According to the uncoiling method, they are divided into active uncoiling and side-back non-stop unwinding.
At present, most baby diaper equipment adopts active unwinding, and some training pants adopt side unwinding, regardless of advantages and disadvantages, but side unwinding can eliminate its loss caused by shutdown and replacement, and is favored by some users.
The reasons for the interruption of spandex yarn in the production process are mainly divided into two categories: one is abnormal quality, such as adhesion, node separation, improper storage and handling, etc. In addition, there are improper application processes, such as insufficient uncoiling tension for active uncoiling short, and large differences in the conduction tension of the guide wheel near the host end.
Elastic spandex yarns are sensitive to changes in tension, and both the spandex guide wire path and guide wheels affect its delivery. Reasonable use of technology should reduce path resistance and avoid too many guide wheels.
Some training pants production lines use as many as 50 spandex, and poor maintenance of the guide wheel often leads to high-frequency wire breakage and downtime. Through proper guide wheel maintenance and tension control, broken wires can be effectively eliminated, and the status of its production process can be incorporated into process, data and visual management.
At present, due to its characteristics, Letswin Textile elastic spandex yarn has been widely used in the field of hygiene products.
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