Blow Molding
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Orange Peel Appearing on the Surface of Polypropylene Blow-Molded Products
Fenómeno do problema
A rough texture similar to orange peel appears on the surface of the blow-molded product, affecting appearance quality.
Orange peel is usually caused by irregular parison surface or poor mold surface replication.
Análise das causas
(1) The parison surface is rough (melt fracture or sharkskin)
(2) The mold surface is rough or the venting is poor
(3) The blowing 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
Solução
(1) Adjust the extrusion temperature and speed to avoid melt fracture on the parison surface (range 200-280°C)
(2) Polish the mold cavity to Ra≤0.4μm and improve venting
(3) Appropriately increase the blowing pressure to 0.4-0.8MPa
(4) Appropriately increase the mold temperature to a reasonable value within the range of 40-90°C
(5) Check the compressed air purification system to ensure it is oil-free and water-free
Conclusão principal
Orange peel is caused by poor parison surface quality or poor mold replication, and needs to be improved from parison quality and the blow '2079851475616104453.
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