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Article | REF: AM3700 V1

Bi-axaially oriented hollow bodies blow moulding process

Author: Bernard PLANTAMURA

Publication date: April 10, 2012

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4. Industrial realization of bi-orientation

Machines and industrial processes for biaxial hollow-body forming can be broadly classified into two processes:

  • the "hot" cycle, a "one-step" process. A single machine produces the bottles from the polymer granules;

  • the "cold" 2-step cycle. A first machine produces a semi-finished product, the preform, which is cooled and stored. A second machine heats and blows the preform into a bottle.

4.1 Common operating conditions

Molecular orientation results from stretching (in the case of monofilaments) or bi-stretching (in the case of hollow bodies or bi-stretched films) under well-defined conditions:

  • The most appropriate deformation...

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Industrial realization of bi-orientation
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