The cooling time of large plastic blow-molded products is usually based on the molding cycle of plastic blow-molded products, accounting for more than one-third of the entire molding cycle
Because the production of blow-molded products uses plastic raw materials, the heated plastic may recover its elasticity due to insufficient cooling time, resulting in unstable molding of plastic blow-molded products and deformation.
The value given here is only an approximate value. The specific cooling time depends on the characteristics of the product produced, including the properties of the raw materials used, the shape of the product, the wall thickness of the product, and the surface pattern of the product.
Depending on the properties of the raw materials, the cooling time required for the product is also different. Some raw materials may cool for a longer time, and some raw materials need to be shorter.
Take polyethylene (PE) as an example. When other production conditions and parameters are the same, the cooling time of polyethylene is a little longer than that of polypropylene.
The more complex the shape of the plastic blow molded product, the thicker the wall thickness, the greater the number of layers, and the larger the volume, the longer the cooling time required.
Everyone should know that controlling the cooling time of plastic molded products is very important, but why is it important, do you know?
This is the case, everyone needs to know that in the process of extrusion blow molding, the inflation of the plastic parison and the cooling of the plastic blow molding product are almost simultaneously ended. Although there will be a deflation time in the process, this time is very short, so short that it can be ignored. Therefore, the inflation time of the parison is similar to the cooling time of the plastic blow molded product in a certain sense. The length and suitability of the cooling time of the plastic blow molded product will directly affect the quality of the plastic blow molded product.
If the cooling time of the plastic blow molded products is not well controlled or the cooling is uneven, the blow molded products may deform, poor surface quality, uneven wall thickness and other quality problems of blow molded products.
Therefore, it is very important to control the cooling time of plastic blow molding products. In addition to the control of the cooling time, the entire cooling process of blow molding requires special attention.
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