What are the methods of stretching and blowing molding?
Can use a variety of methods for bidirectional stretch blow molding.It can be divided into extruded stretch blow molding and injected stretch blow molding.Multilayer blank for co-extrusion or co-injection moulding can also be used for stretching and blow molding.The technological process of bidirectional drawing and blow molding can be divided into the following steps: mold forming, cooling, reheating (tempering), longitudinal drawing, circumferential drawing (blowing and expanding) and vessel demoulding.If these steps are completed in sequence in a forming unit, it is called one step method;If these steps are divided into two sections and completed in two forming units, it is called two-step method.