What types of blow molding are there?

2024-02-24

What types of blow molding are there?
The blow molding process of a blow molding machine can be achieved in a variety of ways. However, the basic principles remain the same. Some types of blow molding are:

1. Extrusion blow molding (EBM)
The extrusion blow molding process involves melting plastic pellets (for example: HDPE, LDPE, PP, PVC, ePET, PETG or “soft touch” resin) in an extruder and extruding them from a parison (hollow tube) . The parison is then placed into a mold, cooled by water and sprayed with compressed air to mold the plastic into the desired shape. Producing bottles and jars is a common use of this technology, which offers versatility for single or multiple products. Despite its limitations in design flexibility, EBM offers faster cycle times, longer-lasting tooling, and cost-effectiveness for high-volume production.

2.Injection stretch blow molding
The injection stretch blow molding process is an important method for manufacturing rotationally symmetrical hollow products, especially high-quality containers. It involves using materials such as polyethylene terephthalate (PET), which is known for its lightweight yet strong properties. The process includes: injection, stretching, blow molding and discharge stages. The preform is heated, stretched and blown to achieve its final shape. While ensuring product high quality, this method requires high precision in stretching and blow molding, which makes it occupy an important position in container production.

Blow Molding Machine

3.Injection blow molding
Injection blow molding machine is used for mass production of hollow objects, mainly focusing on bottles, cans and various containers. The finished product produced using this method has no flash edges and has better visual and dimensional quality than extrusion blow molding. Injection blow molding is a reliable and efficient method for producing high-volume products for both wide-mouth and narrow-mouth containers.

4. Rotate trimming
Rotary trimming technology is specially designed and manufactured to trim machinery that plays a key role in automatically removing domes (unwanted tops) from plastic bottles during the blow molding process. Widely used in various industries, especially milk and dairy products packaging, to improve efficiency and cost-effectiveness. Rotary trim increases blow molding capacity, streamlines processes, reduces maintenance and saves costs, ensuring precise cutting and sterile operation.

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