Blow Molding
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Orange Peel Texture Appearing on the Surface of High-Density Polyethylene Blow Molded Products
Fenómeno del problema
A rough texture similar to orange peel appears on the surface of the blow molded products, affecting appearance quality.
Orange peel texture is usually caused by irregular parison surface or poor mold surface replication.
Análisis de la causa
（1）The parison surface is rough (melt fracture or sharkskin)
（2）The mold surface is rough or the venting is poor
（3）The blowing air pressure is insufficient, and the melt does not fully adhere to the mold
（4）The mold temperature is too low, and the melt cools too fast
（5）The compressed air contains oil or water, contaminating the product surface
Solución
（1）Adjust the extrusion temperature and speed to avoid melt fracture on the parison surface (180-260°C range)
（2）Polish the mold cavity to Ra≤0.4μm and improve the venting
（3）Appropriately increase the blowing air pressure to 0.4-0.8MPa
（4）Appropriately increase the mold temperature to a reasonable value within the 30-80°C range
（5）Check the compressed air purification system to ensure it is oil-free and water-free
Conclusión clave
Orange peel texture is caused by poor parison surface quality or poor mold replication, and needs to be improved from the parison quality and the blow '2079851475616104453.
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