Wrapping machine for single or grouped and/or stacked products, in packs of thermoplastic material obtained from film unwound from a reel and related operating method

Abstract

There is described a machine for packaging products in tubular wrappings of thermoplastic material obtained from continuous film unwound from a reel, equipped with a double transverse heat-sealing andintermediate cutting assembly (13) that, with a horizontal translation movement, accompanies the pack that the assembly (13) is closing the trailing end of to be unloaded while it is simultaneously closing the leading end of the tubular wrapper of the future pack that the heat-sealing and cutting assembly (13), also due to the presence thereon of pressers and counter-pressers (63, 163, 63', 163'), extracts from a tube-forming and longitudinal heat-sealing mandrel (1) and that, by the same assembly (13), is separated from the pack upstream with a transverse cut. At the end of its active movement, the transverse heat-sealing and cutting assembly (13) opens and with a horizontal movement in the opposite direction to and at a higher speed than the preceding one returns to the cycle start position, upstream of a new pack already filled and ready to be heat sealed at the trailing end and accompanied to be unloaded, repeating the cycle described. The transverse heat- sealing and cutting assembly (13) is aided by a conveyor (41) that supports and advances the packs being formed and those finished and separated, and that is equipped with a gap (40) with variable geometry, which opens during the active horizontal movement of the same assembly (13) and closes during the reverse horizontal movement of the same assembly (13).

Description

technical field [0001] The invention relates to a machine for packaging individual or grouped and / or stacked products, especially paper or nonwoven products, for sanitary or other purposes, in packages of thermoplastic material obtained from film unwound from reels , and relates to the method of operation of the machine. [0002] It should be noted that the terms "upstream" and "downstream" used hereinafter relate to the feeding direction of the packages. Background technique [0003] As the closest prior art to an invention filed in International Classification B65B63 / 02, patent US4679379 filed in 1983 by the same inventor of the present patent application is cited. This document describes a packaging machine comprising a horizontal hollow mandrel, of the sailor's tie type, fed at one end with a continuous sheet or film of thermoplastic material unrolled from a reel, the other end of which is formed in a tube in which its longitudinal edges are overlapped and heat-sealed ...

AI Technical Summary

Problems solved by technology

Just like the previous solution, this solution inevitably limits the operating speed of prior art packaging machines and thus limits the productivity

Images