What are the control points in the molding process of the bl

The control points in the molding process of the blow molding machine include many aspects. If appropriate measures are taken to these control points, the quality and quality of the plastic products produced by the blow molding machine will be greatly improved. This is also what  wants to share with you today. What are the control points in the blow molding machine molding process? What do we need to pay attention to? Control of raw materials produced by blow molding machines
In the blow molding process, the selection of raw materials is a very important step.
Before producing the required plastic products, the appropriate blow molding raw materials should be selected according to the parameters of the product. And be familiar with the blow molding processability of raw materials. The selected blow molding raw materials must not only meet the needs of the product, but also meet the production and processing requirements of the blow molding machine.

The production raw materials used by blow molding machines are generally hollow-grade thermoplastic resins. Like HDPE is an ideal choice for blow molding raw materials. Because the melt flow rate of HDPE itself is relatively low, the resin with low melt flow rate can prevent the sagging of the plastic parison in the molten state, which is more conducive to ensuring the uniform wall thickness of the parison.

If you produce large blow-molded products, choose raw materials with low melt flow rate; on the contrary, if you produce small blow-molded products, choose a higher melt flow rate.
Control of production temperature of blow molding machine
Temperature control is an important step in the production process of blow molding machines. From the initial heat treatment of raw materials to the extrusion or injection of the parison, temperature control has always existed.

Xiaobian takes the extrusion blow molding machine as an example.

In the process of extruding the parison from the blow molding machine, the temperature should be set according to the properties of the raw materials. If the temperature is too high, the wall thickness of the product will be uneven; if the temperature is too low, the surface of the product will be rough. Therefore, the control of the production temperature of the blow molding machine really needs to take accurate measures and set the appropriate temperature.

Control of screw speed of blow molding machine
The screw speed affects the plasticizing ability of the extruder to the raw material, but if the screw speed is too high, it will cause certain damage to the raw material. Moreover, the screw must not only ensure a reasonable rotation speed, but also ensure the stability of the rotation speed. This ensures uniform plasticization of the raw material.

The suggestion from the editor here is that choosing a blow molding machine equipped with an IKV screw can not only ensure uniform plasticization of raw materials, but also be more energy-efficient than traditional screws.

Control of die size and quality of blow molding machine
The size and shape of the parison are determined by the die of the blow molding machine. Therefore, the inner surface of the die needs to be smooth and the surface roughness is low.
Control of inflation pressure of blow molding machine
In the production process of the blow molding machine, the introduction of compressed air has two functions: to expand the parison to form close to the inner wall of the mold, and to cool the blow molded product .
How should the inflation pressure be controlled separately? Select lower blowing pressure for lower melt viscosity; higher blowing pressure for higher melt viscosity. Large volume products use a large inflation pressure, and small volume products use a small inflation pressure. A reasonable range of inflation pressure can ensure the quality of the blow molded product surface.
Control of mold temperature of blow molding machine
The temperature of the blow molding machine mold has a certain influence on the quality of blow molding products.
The temperature of the mold is related to the type of plastic raw materials, the wall thickness and volume of the product. For different types of plastics, different mold temperature control methods are required.