METHOD AND DEVICE FOR WELDING SHAPED ELEMENTS MADE OF PLASTICS MATERIAL, NAMELY PVC Russian patent published in 2018 - IPC B29C65/20 B23C3/30 E06B3/96 B29K27/06 B29L31/10 

FIELD: technological processes.

SUBSTANCE: group of inventions relates to method for welding profile elements of plastics material, in particular PVC, and to device for carrying it out. Method comprises the following steps: - preparing at least two profile elements (3) made of plastic material, with location of respective welding zones (4) opposite to each other; - heating of welded zones (4); - before heating stage, the step of manufacturing grooves (19) corresponding to peripheral edge of each of welded zones (4); - joining welded zones (4) to each other by pressing profile elements (3) to each other to maintain mutual contact between welded zones (4); wherein joining step of weldable zones (4) defines additional step of melting welded zones (4) into each other to form surfacing roller and comprises additional steps: - (27, 28) in accordance with grooves (19), so as to form, along with grooves (19), a restraining compartment (19a) for surfacing roller, wherein pressing means (27, 28) comprise: - first working surface (62) with projecting part (63); and - second working surface (64) for final processing; and - displacement of said clamping means (27, 28) alternately between: - inoperative position remote from profile elements (3), - first working position, in which first working surface (62) is adjacent to grooves (19), and protruding portion (63) is located within confinement compartment (19a) so as to deflect surfacing roller toward side walls (61) of confinement compartment (19a); and - second operating position in which second working surface (64) abuts grooves (19) so as to obtain final surfacing roller.

EFFECT: technical result achieved by using a group of inventions is to provide fast welding and eliminating additional operations to remove the surfacing roller.

18 cl, 15 dwg