MULTIPLE-LAYER PREFORMED BLANK FOR BLOW MOULDING OF VESSEL AND METHOD OF ITS MANUFACTURE, MULTIPLE-LAYER VESSEL AND METHOD OF ITS MANUFACTURE Russian patent published in 1999 - IPC

FIELD: production of blanks and vessels. SUBSTANCE: blank and vessel have at least two layers, outer and inner ones, with thickness differential in height. Inner layer of blank is extruded layer, and outer layer is formed by injection moulding. In manufacture of multiple-layer preformed blank and vessel extrusion device is used with special means for setting required thickness of material. Making of inner layer of vessel with variable thickness provides economy of material for its manufacture. EFFECT: reduced consumption of material. 29 cl, 13 dwg