Detailed Introduction to Suzhou Blow Molding Processing

Juxinchang editor learned that blow molding processing in Suzhou is a rapidly developing plastic processing method. Blow molding technology began to be used in the production of polyethylene small bottles during World War I. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely applied. 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 production method of preforms, blow molding can be divided into extrusion blow molding and injection blow molding, with newly developed methods including multi-layer blow molding and stretch blow molding.

Principles of Suzhou blow molding processing

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 closing the mold, compressed air is immediately introduced into the preform to inflate it and tightly adhere to the inner wall of the mold. After cooling and demolding, various hollow products are obtained.

The manufacturing process of blown film is very similar in principle to blow molding of hollow products, but it does not use molds. From the perspective of plastic processing technology classification, the molding process of blown film is usually included in extrusion. Blow molding technology began to be used in the production of low-density polyethylene small bottles during World War II. In the late 1950s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely applied. 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.

Suzhou blow molding processing technology

3/4 of blow molded products are manufactured by extrusion blow molding method. Extrusion technology forces materials to pass through a hole or mold to manufacture products.

The extrusion blow molding process consists of 5 steps:

1. Plastic preform (extrusion of hollow plastic tubes); 2. Close the flap mold on the embryo, clamp the mold and cut off the embryo; 3. Inflate the cold wall of the mold cavity, adjust the opening, and maintain a certain pressure during the cooling period; 4. Open the mold and remove the blown parts; 5. Trim the edges to obtain the finished product.

According to the understanding of Juxinchang editor, Suzhou blow molding processing is generally applicable to daily necessities such as bottles, cans, baby products, sports equipment, etc