what's blow molding

Plastic blow molding technique is developing rapidly for plastic process . The thermoplastic resin obtained by extrusion or injection molding of plastic tubular parison hot ( heated or softened state ) , placed inside the mold cavity , then closed mold immediately, pour into air, blowing the plastic parison inflation and close to the inner wall of the mold cavity, cooled mold , that get all kinds of hollow plastic products.

 Technical Overview     Blow molding process during World War II began for the production of low-density polyethylene vial. In the late 1950s , with the development of high-density polyethylene birth and blow molding machines , blow molding technology has been widely used. Hollow container volume up to thousands of liters, and some have adopted computer-controlled production . For blow plastics are polyethylene, polyvinyl chloride, polypropylene, polyester, etc. , resulting into the empty containers are widely used in industrial packaging containers.

According to the production method of the parison , blow molding and extrusion blow molding can be divided into the injection blow molding, a newly developed multi-layer blow molding and stretch blow molding.

 

 Prospects    In recent years , with the development of a variety of functional beverages and wine packaging market , a variety of multi-layer co-injection - blow molding technology become a hot market .

Flexible step production technology

Injection stretch blow molding hollow articles having uniform thickness, good dimensional stability, light weight , high strength , etc., and therefore a very wide range of applications . As the injection stretch blow container craft production mostly PET, PP, PE, PVC and other materials as raw materials, and the use of these raw materials to produce bottles with light, portable, non-toxic , transparent, unbreakable , good barrier properties , etc., making it more and more as an alternative medicinal bottles were used in carbonated drinks, juice drinks , water , edible oil , alcohol , cosmetic products, pharmaceuticals and other industries packaging.

Injection stretch blow a two-stepprocessing method and one-step process . One step from raw material to complete the entire container molding process on a single device. Two-step process from the raw materials needed to complete the two devices to products molding process . Two-step method is mainly suitable for mass production , and flexibility, both equipped with a multiple injection blow molding machine can also be equipped with more than one injection blow molding machine . Of course, this should be based on production to match the main injection machine and blowing may be.