METHOD OF BLOW MOULDING OF PLASTIC ARTICLE AND MOULD TO THIS END Russian patent published in 2014 - IPC B29C49/18 B29C49/20 B29C49/48 B29C49/42 B29C69/00 

FIELD: process engineering.

SUBSTANCE: invention relates to production of plastic articles. Proposed method comprises the stages described below: extrusion of hose workpiece; melt flow separation inside extrusion die or cutting of extruded piece to obtain workpiece of approximately C-like shape and deformation of workpiece inside said die for blow moulding with application of pressure difference to hollow body. Proposed method differs from known processes in that, first, workpiece is expanded and pre-deformed in partially closed die. Then, at least one add-in part is arranged between parts of partially close die via workpiece open side inside said partially moulded article to close the die completely. Note here that said article of completely formed to obtain at least partially enveloping flattened seal. Mould closure is made in two steps. Note also that at first step, at least one plunger, preferably, several plungers fitted in die cavities make the front face parts of the die squeeze the workpiece to make at least one hole there between. Invention covers also the method of blow moulding.

EFFECT: lower costs, perfected configuration.

16 cl, 7 dwg