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Injection Stretch Blow Moulding Technology

PET Containers are produced in two steps, firstly by injection molding of test-tube shaped PET preforms from PET granules raw material and secondly by stretch blow molding these preforms into bottles or jars.

There are two ways to do this:

  • Two Stage Process (using 2 machines) and
  • Single Stage Process (using 1 machine).

CYPET machines are Single Stage machines that transform PET resin into a preform and then into a finished container all within the same machine.

Production Methods

Two-stage process

PET preforms are injection molded on an injection molding machine. They are then transported and fed to a second machine that re-heats them and stretch blow molds them into finished containers.

  • Best For:
  • High production output of beverage bottles
  • Standard neck sizes readily available in the market
  • Maximum production volumes

Single-Stage Process

PET resin is transformed into preforms and then stretch blow moulded into finished containers within one machine.

  • Best For:
  • Medium production rates
  • Non-standard neck designs and custom containers
  • Flexible production with variety of sizes and shapes

Single stage vs Two stage Injection Stretch Blow Molding Comparison

  • Conventional Single stage process has the following advantages over Two Stage Process:
  • 25% less energy consumption. The molded preforms do not have to be completely cooled after injection molding and then re-heated for stretch blowing.
  • 50% less scrap. No need for packing, storing and transporting preforms.
  • Then the rests suitable for all containers irrespective of neck design and weight. There is no restriction to only the preforms available on the market.
  • Superior container clarity and gloss, as there is no preform surface deterioration due to storage and transport.
  • Flexibility to produce a very wide variety of container sizes, shapes and neck diameters on the same machine.
  • Two Stage process has the following advantages over Single Stage:
  • Much Higher production outputs are possible
  • Quicker Mold changes

100% Recyclable
PET can be recycled repeatedly while maintaining virgin-grade mechanical properties

CYPET supports you every step of the way. 

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