METHOD AND DEVICE FOR WELDING PLASTIC TUBES FROM INSIDE Russian patent published in 2012 - IPC B29C53/38 B29C65/40 

FIELD: process engineering.

SUBSTANCE: set of invention relates to method of producing tubular polymer package, tubular package produced thereby, and device to this effect. Proposed method comprises folding rolled material, locating rolled material edges end-to-end, and welding said edges together. Note here that polymer cord is extruded and applied, in fused state, onto package inner surface to overlap at least welding zone between edges. Note here that power necessary for producing welding zone is provided by polymer cord. Package comprises element to harden the zone defined by edges that consists of extruded polymer cord. Proposed device comprises welding rod to be enveloped by rolling stock and appliances to extrude and apply fused polymer cord between welding outer surface and rolling stock enveloping said rod.

EFFECT: stronger butt welding.

13 cl, 5 ex, 14 dwg