METHOD AND DEVICE TO PRODUCE TUBULAR ARTICLES FROM THERMOPLASTIC MATERIAL Russian patent published in 2011 - IPC B29C49/04 B29C49/02 B29C49/78 B29C47/92 F16J3/04 

FIELD: process engineering.

SUBSTANCE: proposed method and device are intended for producing tubular articles, e.g. corrugated tubes, from thermoplastic material. Proposed device comprises extruder head with mandrel moved to vary extrusion head cross section, plunger to extrude preset amount of plastic material through said head, and drawing unit to draw tubular plastic article from said head. Drawing unit, plunger and mandrel are driven to allow drawing unit and plunger to move in compliance with speed profiles independently adjusted along the entire travel of drawing unit and plunger. Mandrel is moved in compliance with profile of positions independently adjusted along the travel of drawing unit of plunger. Note here that said travel should proceed during interval equal to that of drawing unit and plunger move. This allows adjusting tubular article wall over its entire length and to high accuracy. Proposed method comprises extruding and drawing of billet from plasticised plastic material and controlling both processes in compliance with speed profiles for all operating components.

EFFECT: tubular article with wall thickness accurately adjusted over article length.

10 cl, 5 dwg