Cooling time of plastic blow molding products of large hollow blow molding machines
How long does the cooling time of plastic blow molding products take: the cooling time of plastic blow molding products is an important factor affecting the blow molding process. Today, the editor brings a question that everyone often asks, that is, how long does the cooling time of plastic blow molding products take? The cooling time for large plastic blow-molded articles is usually longer. It is generally based on the molding cycle of plastic blow molding products, accounting for one-third to two-thirds 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 and deformation of plastic blow-molded products. The value given here by the editor is only an approximate value. The specific cooling time depends on the characteristics of the products 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. The performance of raw materials is different, and the cooling time required for products is also different. Some raw materials may be cooled a little longer, and some raw materials need a little shorter. Take polyethylene (PE) as an example. Under the same production conditions and parameters, the cooling time of polyethylene is a little longer than that of polypropylene. The more complex the shape of plastic blow molding products, the thicker the wall thickness, the more layers, and the larger the volume, the longer the cooling time required. Everyone should know that it is very important to control the cooling time of plastic molding products, 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 molded product almost end at the same time. Although there will be a deflation time in the process, this time is very short and 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 appropriateness 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 plastic blow-molded products is not well controlled or the cooling is uneven, the blow-molded products may suffer from deformation, 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-molded products. In addition to the control of cooling time, the entire cooling process of blow molding requires special attention.
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