Extrusion blow molding machine -What to do if the wall thickness is uneven?

Extrusion blow molding machine is one of the main forming methods for the production of economical hollow plastic products. It is suitable for the hollowing of materials such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, polyamide, polyphthalamide, and polycarbonate. Formed. Mainly used to form container products.

Extrusion blow molding products are widely used in food, beverages, cosmetics, medicines, washing products, children's toys and other fields. Extrusion blow molding technology has been greatly developed so far, and the shape of the product is more complicated and has unique functions.

1. Special-shaped die. Die profiled means that the die or mandrel of the extruder head is provided with a groove at a local position to increase the gap of the die at the corner of the corresponding part to increase the wall thickness at the local position of the parison. A profiled parison is obtained to compensate for the uneven radial wall thickness caused by the inconsistent inflation ratio, thereby obtaining a workpiece with a relatively uniform wall thickness.

2. The die head can be adjusted to obtain parisons with different thicknesses according to the different inflation ratios of each part of the product. By controlling the opening of the die, a parison with varying thickness can be obtained, so as to obtain a workpiece with a relatively uniform wall thickness.

3. The parison temperature difference method, the deformation resistance of the parison can be expressed by the viscosity, and the size of the viscosity is related to the temperature. The parison temperature is high, the scoop degree is small, the deformation resistance is small, and it is easy to deform during the blow molding process, and the deformation is large; on the contrary, the parison temperature is low, the scoop degree is large, and the deformation resistance is large, and it is not easy to deform during the blow molding process. Smaller.