Machine for testing extensible plastic films for packaging
AssigneeAetna Group S.P.A.
InventorsMauro Cere′, Andrea Renzini
Life of this patent
Estimating the term…
Abstract
A testing machine to perform measurements and/or tests on a plastic film comprises a basic structure provided with a supporting plane, an unwinding station provided with an unwinding roller that supports a reel of film, a pre-stretching station arranged to unwind and to pre-stretch the film from the reel. The testing machine further comprises a wrapping station provided with a testing drum to be wrapped by the film coming out from the pre-stretching station, a plurality of measuring groups to perform measurements of dimensional and/or physical parameters of the reel and of the film, and a plurality of testing groups to perform respective tests and measurements on the film in order to determine mechanical and physical properties thereof.
Claims32
A testing machine to perform a plurality of measurements and tests on a film made of plastic in order to determine mechanical and physical properties of the film, the testing machine comprising:
- a basic structure that is provided with a supporting plane;
- an unwinding station that is supported by said supporting plane and provided with an unwinding roller that is driven and/or controlled in rotation about a respective longitudinal axis by a first driving system and is arranged to support a reel of the film;
- a pre-stretching station that is supported by said supporting plane and arranged to unwind the film from the reel with a preset unwinding speed and to pre-stretch the film at a preset percentage, wherein said pre-stretching station comprises a plurality of pre-stretching rollers that are driven in rotation about respective longitudinal axes by a second driving system and a plurality of return rollers to deviate and wrap the film on said pre-stretching rollers according to a predetermined pre-stretching path, and wherein said pre-stretching rollers and said return rollers are interchangeable, and adjustably positionable to change the pre-stretching path;
- a wrapping station that is supported by said supporting plane and provided with a testing drum that is driven and/or controlled in rotation about a respective longitudinal axis by a third driving system and arranged to be wrapped at least partially by the film coming out from said pre-stretching station;
- a plurality of guiding rollers to lead the film along an unwinding path from said unwinding station to said pre-stretching station and from said pre-stretching station to said wrapping station, wherein said guiding rollers are interchangeable and reversibly and adjustably mountable to said supporting plane to change the unwinding path;
- a plurality of measuring groups to perform a plurality of respective measurements at least of dimensional and/or physical parameters of the reel and of the film and reversibly and adjustably mountable to said supporting plane depending on the unwinding path;
- and
- a plurality of testing groups that are provided with respective devices arranged to interact with the film to perform respective tests and measurements on the film in order to determine mechanical and physical properties of the film.
Dependencies are inferred from the claim text.