Quality management of anti-static shoes
Anti-static shoes are one of the most commonly used products in the ESD protection series, and their quality has a crucial impact on the anti-static effect. Currently, ESD shoes on the market are generally divided into two materials: PVC and PU. The midsoles are all made of conductive electrostatic polyester fabric and T/C fabric. They are classified into ordinary anti-static areas and dust-free areas based on their uses. The style can be customized by the user according to the requirements of the enterprise. In terms of material, PVC soles and PVC leather anti-static shoes are relatively inexpensive and have stable anti-static performance. Most enterprises choose this material. In the current context where environmental protection is the top priority, PU outsole /PU leather anti-static shoes are gradually receiving attention. Although it is not recyclable, many large and powerful enterprises choose PU material because of its light weight and better breathability than PVC. Regardless of the material or price, it should be tested in accordance with the national standard GB 4385-1995 as a matter of routine. The main indicators for inspection are the hardness and durability of the sole, and the thickness and tension of the leather should be analyzed. During the production process of the upper and sole, attention should be paid to their adhesion. There should be no delamination, otherwise it will affect the anti-static effect and the environment of the EPA operation area. Generally, the adhesion is most ideal when the upper and sole of shoes are made of the same material. Many manufacturers of ESD shoes use two materials, namely PVC upper and PU sole, to combine. This method can be adopted in a non-washing state, but dust-free shoes often experience delamination after repeated washing and drying. This depends on the selection of PVC leather materials. Every user should be well aware of the number of washes.
The detection of the anti-static performance of ESD shoes is a very important step. The inspection is carried out under appropriate temperature (generally 22-25 degrees) and humidity (not less than 45 degrees), mainly testing the surface resistance value and grounding resistance of the sole. Dust-free shoes need to be cleaned regularly and the dust emission rate should be tested. If the dust emission rate rises, the corresponding purification level will not be reached.