The causes of slipper white spots in the production process of slippers may involve multiple aspects. Here are some possible reasons and solutions:
1.Raw material issues
Moisture content: The raw materials used in the production of slippers, such as EVA, may produce white spots during molding or processing if the moisture content is too high. This is because moisture is unevenly distributed inside the material, resulting in local color differences or spots during heating or cooling processes.
Impurity pollution: Raw materials may contain impurities such as dust, oil stains, etc., which may not be completely removed during processing, resulting in the formation of white spots on the surface of finished slippers.
2.Production process issues
Temperature control: Improper temperature control during the injection molding or shaping process of slippers may result in uneven heating of the material, leading to the formation of white spots. For example, injection molding temperatures that are too high or too low may affect the flowability and curing effect of the material, leading to the formation of spots on the surface of the finished product.
Poor exhaust: Improper design or poor exhaust of the exhaust system in injection molds may also cause white spots on the surface of slippers. During the injection molding process, if the air inside the mold cannot be discharged in a timely manner, bubbles or voids may form inside the material, which may form visible white spots after cooling and solidification.
Pressure control: Pressure control during injection molding is also one of the key factors affecting the quality of finished products. If the pressure is unstable or set improperly, it may cause uneven distribution of materials inside the mold, resulting in the formation of white spots on the surface of the slippers.
3.Equipment maintenance issues
Incomplete machine cleaning: If the cleaning work of production equipment is not thorough, it may result in residual impurities or oil stains on the surface of the equipment, which may adhere to the surface of slippers and form white spots during the processing.
Mold wear: After prolonged use, the mold may experience wear or damage. If the surface of the mold is uneven or scratched, it may also form spots on the surface of the slippers.
4.Solution
Control the quality of raw materials: Ensure that the quality of raw materials is qualified, the moisture content is moderate, and there is no impurity pollution.
Optimize production process: Strictly control parameters such as temperature and pressure during the production process to ensure uniform heating and smooth flow of materials. At the same time, design the exhaust system of the mold reasonably to ensure that the air can be discharged in a timely manner.
Strengthen equipment maintenance: Regularly clean and maintain production equipment to ensure that the surface of the equipment is clean and free of impurities. At the same time, regularly check the wear and tear of the molds and replace damaged molds in a timely manner.
Using additives: For certain specific white spots problems, it is possible to consider adding an appropriate amount of additives to the raw materials to improve their flowability and curing effect, thereby reducing the occurrence of white spots. Xiangxi White Spots Agent DX518 is a product specifically developed for the problem of white spots generated during the production process of EVA slipper.
In summary, the causes of white spots in the production process of slippers are multifaceted and require comprehensive analysis and solutions from multiple aspects such as raw materials, production processes, and equipment maintenance.
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