Injection Stretch Blow Moulding

For many years Gemini have been leaders in the field for blow moulding production. We service many market sectors from consumer packaging to automotive and aerospace. It has always been our business to ensure we are meeting the needs of our customers  and one key area we have identified is the manufacturing of ISBM Injection stretch blow moulding.

ISBM containers allow for a precise weight, and are good for very close tolerance neck finishes, wide mouth opening containers, solid handles and highly styled shapes. Material distribution is generally very even, with trimming and reaming at a bare minimum if any. There is also a great deal of scope for multi-layered containers.

"A passion to produce high quality production parts, give Gemini a call today!"

Bottles blown from PET - (Polyethylene Terephthalate) can have the following advantages:

  • Suitable for recycling
  • Dimensionally very accurate bottles
  • Can produce lighter weight bottles
  • Excellent clarity
  • Thermally stable
  • High breakage resistance
  • Precision injection neck on a blow moulded bottle


injection-stretch1000At Gemini we have captured knowledge from years of research which is now more relevant than ever to produce the next generation of light weight low cost packaging. This two stage system coupled with our extensive production experience of traditional blow and injection moulded processes allows us to deliver production bottles to the highest quality whilst offering competitive pricing and quick timelines.


Injection Stretch Blow moulding process

Injection stretch blow moulding (ISBM) is a combination of injection moulding and blow moulding to produce very high quality and very high clarity precision bottles. First a ‘preform’ is created via the injection moulding process, the preform is then placed in the ISBM machine and heated before being placed in the blow tool cavity. The mould shuts and high pressure air is injected where it stretches the preform vertically inside before being blown to fill the cavity. Once the blow cycle ends the tool opens to allow the process of another preform to be loaded and the process can start again.