Also known as hollow blow molding, a rapidly developing plastic processing method. The tubular plastic preform obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the preform to blow and expand the plastic preform tightly against the inner wall of the mold. After cooling and demolding, various hollow products are obtained. The manufacturing process of blow molded film is very similar to that of hollow products in principle, but it does not use molds. From the perspective of plastic processing technology classification, the forming process of blow molded film is usually included in extrusion< During World War II, blow molding technology began to be used in the production of low-density polyethylene small bottles. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach thousands of liters, and some production has adopted computer control. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The resulting hollow containers are widely used as industrial packaging containers< According to the method of making preforms, blow molding can be divided into extrusion blow molding and injection blow molding. The newly developed ones include multi-layer blow molding and tensile blow molding
Detailed introduction:
Also known as hollow blow molding, a rapidly developing plastic processing method.
. The tubular plastic preform obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while it is hot (or heated to a softened state). After the mold is closed, compressed air is immediately introduced into the preform to blow and expand the plastic preform tightly against the inner wall of the mold. After cooling and demolding, various hollow products are obtained. The manufacturing process of blow molded film is very similar to that of hollow products in principle, but it does not use molds. From the perspective of plastic processing technology classification, the forming process of blow molded film is usually included in extrusion< During World War II, blow molding technology began to be used in the production of low-density polyethylene small bottles. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers can reach thousands of liters, and some production has adopted computer control. Plastics suitable for blow molding include polyethylene, polyvinyl chloride, polypropylene, polyester, etc. The resulting hollow containers are widely used as industrial packaging containers< According to the method of making preforms, blow molding can be divided into extrusion blow molding and injection blow molding. The newly developed ones include multi-layer blow molding and tensile blow molding
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