US 12,467,806 B2 · Testing film with determination of force

Abstract

A device for measuring a stretching force on a film, including an unwinding station to hold and unwind a spool of stretch film via an unwinding motor, and including a first stretching station with a first driven stretch roller and a second driven stretch roller for imparting a predetermined first stretch to the stretch film. The device includes a second stretching station with a third driven stretch roller for imparting a second predetermined stretch to the stretch film. A sensor is provided in the unwinding station in order to measure a release parameter indicative of where the stretch film releases from the spool. A processor is provided to calculate a first and second force, needed to obtain respectively the first stretch and second stretch, on the basis of the release parameter and an output of the first, second, third torque meters and the unwinding torque meter.

Claims14

Dependent claims

A method for testing a stretch film, comprising:

unwinding a spool of stretch film in an unwinding station with a driven unwinding device;
throughfeeding through a first stretching station, wherein a predetermined first stretch is imparted to the stretch film between a first driven stretch roller and a second driven stretch roller;
throughfeeding through a second stretching station, wherein a predetermined second stretch is imparted to the stretch film by a third driven stretch roller;
determining a first force on the film during the predetermined first stretch;
and
determining a second force on the film during the predetermined second stretch;
wherein the first force and the second force are determined on the basis of a measurement of an unwinding torque on the unwinding device, measuring a first, second and third torque on respectively the first, second and third driven stretch roller, and a measurement of a release parameter in the unwinding device which is indicative of where the film releases from the spool.

4 more elements

A device for measuring a stretching force on a film, the device comprising:

an unwinding station to hold and unwind a spool of stretch film, which unwinding station has an unwinding motor for controlling the rotation speed of the spool during unwinding of the stretch film,
a first stretching station with a first driven stretch roller and a second driven stretch roller for imparting a predetermined first stretch to the stretch film, and
a second stretching station with a third driven stretch roller for imparting a second predetermined stretch to the stretch film,
wherein the first, second and third driven stretch roller are provided with respectively a first, second and third torque meter,
wherein the unwinding motor is provided with an unwinding torque meter and wherein a sensor is provided in the unwinding station in order to measure a release parameter which is indicative of where the stretch film releases from the spool, and
wherein a processor is provided to calculate a first force and a second force, needed to obtain respectively the first stretch and second stretch, on the basis of the release parameter and an output of the first, second, third torque meters and the unwinding torque meter.

3 more elements

Dependencies are inferred from the claim text.

Testing film with determination of force

Life of this patent

Testing film with determination of force

Life of this patent

Abstract

Claims14