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| Blow moulding is used to form polymeric materials such as PET and polyalkenes. The process is also used to form glass products. In both cases, a heated boule of the material is introduced into a mould and the internal air pressure is increased to cause the material to deform by viscous flow. The mould is normally in two or more sections and, once the desired shape is formed, can be split to remove the product. |
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| Most
PET bottles and containers are fabricated in this way. The deformation
of the material during blowing orients the macro-molecules of the polymer
and may give anisotropic mechanical properties. The split mould permits
re-entrant surfaces to be formed in this process. Removal of waste material
is required as a final step.
From: "Manufacturing with Materials," Edwards and Endean (Eds.), Butterworth (1990) |
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