Machine for testing extensible plastic films for packaging

Abstract

A testing machine (1) to perform a plurality of measurements and/or tests on a film (100) made of plastics in order to determine mechanical and physical properties of the film (100), comprises a basicstructure (2) provided with a supporting plane (8); an unwinding station (3) provided with an unwinding roller (31) driven and/or controlled in rotation about a respective longitudinal axis by firstdriving means (32) and arranged to support a reel (101) of the film (100); a pre- stretching station (4) arranged to unwind the film (100) from the reel (101) with a preset unwinding speed and to pre-stretch the film (100) of a preset percentage, the pre-stretching station (4) comprises a couple of pre-stretching rollers (41; 42) driven in rotation about respective longitudinal axes by second driving means (43, 44) and a plurality of return rollers (45, 46, 47) to deviate and wrap the film (100) on the pre- stretching rollers (41, 42) according to a predetermined pre-stretching path; the pre-stretching rollers (41, 42) and return rollers (45, 46, 47) are interchangeable and adjustably positionable to change the pre-stretching path; the testing machine (1) further comprises a wrapping station (5) provided with a testing drum (51) driven and/or controlled in rotation about a respective longitudinal axis by third driving means (52) and arranged to be wrapped at least partially by the film(100) coming out from the pre-stretching station (4); a plurality of guiding rollers (21-24) to lead the film (100) along an unwinding path from the unwinding station (3) to the pre-stretching station (4) and from the latter to the wrapping station (5), the guiding rollers (21-24) being interchangeable and reversibly and adjustably mountable to the supporting plane (8) to change the unwinding path; a plurality of measuring groups (11-16) to perform a plurality of respective measurements at least of dimensional and/or physical parameters of the reel (101) and of the film (100) and reversibly and adjustably mountable to the supporting plane (8) depending on the unwinding path; a plurality of testing groups (17-20) provided with respective means to interact with the film and perform respective tests and measurements on the film (100) in order to determine mechanical and physical properties of the latter.

Description

technical field [0001] The present invention relates to machines and systems for inspecting and testing films or wraps of stretchable plastic material intended for manual or automatic winding of objects, bulk packages, products grouped on pallets to form pallet loads . In particular, the present invention relates to a testing machine capable of carrying out a number of different measurements and tests on cold stretchable plastic films to determine their optimal use for packaging, especially for wrapping pallet loads. required mechanical and physical properties. Background technique [0002] As known, films made of stretchable plastic material are widely used for wrapping items, bulk packages, products, etc., which are usually grouped and arranged in superimposed layers on a pallet or platform to form a pallet load. A usually pre-stretched or elongated plastic film wrapped around a load with an established wrapping force not only protects products, objects, packaging from ...

AI Technical Summary

Problems solved by technology

These film property tests, which are mainly performed manually or semi-automatically by qualified personnel,

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