Extrusion blow molding machine cooling method

• The production process of blow molding machine

The production process of the blow molding machine is that the extruder continuously extrudes the tube blank. When the tube blank reaches the set length, the mold is closed, the tube blank is cut off, and the mold is moved to the next station for inflation and cooling. , Demoulding to obtain finished plastic products.

• The cooling method of the blow molding machine
  

Speeding up the cooling rate can shorten the production cycle and speed up the cooling rate. How many cooling methods are commonly used in the industry?

1. The mold is cooled. When the parison is inflated in the mold, the melt is tightly attached to the mold cavity wall, and the heat of the melt passes through the product wall and is transferred to the cooling medium through the mold wall to reduce, so that the container is gradually cooled and shaped. Mold cooling is the most commonly used cooling method for extrusion blow molding.

2. Out-of-mold cooling is to take out the preliminarily cooled and shaped products and place them in the out-of-mold cooling device to continue cooling. This cooling method can reduce the cooling time of the product in the mold, shorten the molding cycle, and improve production efficiency. This method is mainly used for blow molding of large products.

3. Inner cooling, extrusion blow molding, only the outer wall of the container is in contact with the blowing air, the heat transfer is small, and the cooling rate is slower. The difference in cooling rate between the inside and outside of the extrusion blow molded product not only prolongs the cooling time of the product, but also easily causes the product to warp and deform, and the use of internal cooling can significantly improve the production efficiency of the container.

Look at the text of the article, do you understand the cooling method of the blow molding machine? The common cooling methods include mold cooling, external cooling, and internal cooling.