Method for manufacturing plastic containers by blow moulding
A container, pre-blowing technology, used in liquid bottling, household components, applications, etc., to solve problems such as insufficient production to ensure proper quality
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[0045] figure 1 A container 2 manufacturing machine 1 is shown which blows or stretch blows blanks 3 (usually preforms, although they can also be intermediates) of thermoplastic material such as polyethylene terephthalate. container) to make a container, such as a bottle or a flask.
[0046] The manufacture of container 2 consists of two main stages:
[0047] - Prefabrication of a tubular blank 3 from plastic material in an injection mold (not shown);
[0048] - Then, in the mold 6 of the blowing or stretch-blow unit 5 of the machine 1, a compressed gas such as air is injected into the interior of the preheated blank 3; the material is then stretched, against the cavity and fit the shape of model 6 (see image 3 , wherein the blank 3 indicated by the dashed line changes towards the container 2 indicated by the solid line).
[0049] The mold 6 is then opened and the container 2 exits the blowing unit 5 .
[0050]During the first phase, the first stage consists of heating t...
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