Continuous peel testing machine

Continuous peel test bench testing adhesion and optimising the bonding process. Patented mechanical test bench that won the “testing” award at JEC America 2016.

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THE SOLUTION PROVIDED BY LF TECHNOLOGIES

Industrial Design

Mechanical Design

Electronic Design

Our client, the Centre Technique des Industries Mécaniques, aims to provide mechanical engineering companies with the means and skills to increase their competitiveness, participate in standardisation and act as a link between scientific research and industry.

Main functions

Objective

This machine is designed to perform peel tests on carbon fibres, bonded together by a bonding system whose effectiveness must be evaluated.

Problematic Issues

To carry out a continuous peel test of a sample (composite coil) in order to test and optimise the bonding process.

Solution and Result

In partnership with CETIM, LF Technologies has developed a new principle of continuous peel testing (patented).

The system consists of evaluating the unwinding force of a web by pulling on it with a speed-controlled drum, while the reel itself is held in rotation by another drum whose holding torque is controlled. The angle of detachment, measured by a roller, is kept constant in relation to a set point, by the control of the holding torque.

The phenomenon used is similar to the one observed when a roll of tape is unwound, by braking the rotation more or less. The more the roll is braked, the more the peeling is tangential. If the roll is completely free, the peel is almost radial. Because of the bending fragility of carbon fibres, the angle of disbonding is kept rather tangential.

A suitable software program developed under LabVIEW permanently receives the information on the rotational position of each of the servomotors, the value of each of the measured torques, and the angular position of the disbonding angle measuring roller. The program allows the desired test parameters to be set and the curves and test results to be displayed, viewed and saved.

The realized continuous peeling bench was presented at JEC Americas in 2016 and won the award in the category “Testing”.

Products tested

Carbon composite

Carbon composite is made up largely of carbon fibres and is a very light but strong material. Carbon composite can be used to build rocket engines, aircraft brakes or various parts for industry. Some parts are made by winding and gluing a ribbon of carbon fibres.

JEC Innovation Awards 2016 Atlanta

Continuous peel testing machine

Continuous peel testing machine - JEC Innovation Awards

Continuous peeling bench

The peel tester is used to continuously measure the adhesion energies of thermoplastic laminates in order to test and optimise the bonding process.

Schematic diagram of a peel test

No preparation

The thermoplastic composite segments are transferred directly from production to the test area.

OUR KEY TEST BENCH FOR THESE TESTS MPC CONTINUOUS PEELING BENCH

The peel tester is used to continuously measure the adhesion energies of thermoplastic laminates in order to test and optimise the bonding process. The principle of winding and gluing a composite strip is a technology that is increasingly used in the industrial sector, as it offers greater productivity. In order to optimise the quality of the bond between the composite layers and certain physical parameters such as pressure, temperature and heat transfer, LF Technologies has developed a continuous peeling bench. This highly innovative system offers highly accurate analysis of interlaminar adhesion and debonding force. The machine can be installed directly on the production floor to evaluate the adhesion parameters of thermoplastic composites in real time.