What is extrusion blow Moulding machine?

Extrusion blow molding machine is a plastic processing machine. After the liquid plastic is sprayed out, the plastic body is blown and attached to a mold cavity of a certain shape by using the wind blown out by the machine to make a product. This kind of machine is called a blow molding machine. The plastic is melted and extruded quantitatively in the screw extruder, and then shaped through the mouth film, and then cooled by the wind ring, and then pulled by a tractor at a certain speed, and wound into a roll by a winding machine.

In the processing and scheduling of blow molding products, the control of parison wall thickness is very important for improving product quality and reducing production costs. Therefore, the early machines have used two-stage oil pressure to control the two positions of the mandrel shaft gap, that is to say, there are only two effects of thick or thin. In order to meet the increasingly higher precision and stability requirements for blow molding products, the modern embryonic wall thickness control system has been equipped with and utilizes a servo hydraulic system and a computer to form a multi-stage control, thereby greatly improving the product quality. quality.  

How to ensure the thickness of the embryo wall of the finished product?

The product is accurately controlled during the blow molding process, so that the thickness of the embryo wall of the finished product can be consistent. Through the experiment of impact resistance, it is found that the product with uniform wall thickness not only uses less material, but also has a higher impact resistance strength. High, so adding a wall thickness control system to the blow molding machine can achieve higher productivity. Reduce material costs, increase output, shorten cooling time of finished products, that is, increase overall production profit.  
If the product is not controlled during the blow molding process, the embryo wall after cooling will have uneven thickness, and these thinner positions are more likely to break during the impact resistance test. The reason is that the embryo walls with different thicknesses produce different stresses during the cooling process, thus reducing the quality of the product.  If the mandrel gap can be changed with different parison positions to produce products with a more uniform wall thickness, then the problem of easy cracking due to different wall thicknesses will be solved

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