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Methods to Measure Film adhesion

IP.com Disclosure Number: IPCOM000032876D
Publication Date: 2004-Nov-17
Document File: 3 page(s) / 14K

Publishing Venue

The IP.com Prior Art Database

Abstract

The following methods are proposed to measure the adhesion of paint, PU Film, chemical coatings etc. to plastic trim, leather, fabric yarns etc.

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Methods to measure Film adhesion

Description of Invention:

The following methods are proposed to measure the adhesion of paint, PU Film, chemical coatings etc. to plastic trim, leather, fabric yarns etc.

1)  High pressure air jet.

Similar to the high pressure wash method, however using a jet of high velocity air to try and lift the film.  The film may be scored as in the high pressure wash test and the jet tracked either across or along the scored line.  For cases of poor adhesion it may not be necessary to score the film.  Alternatively an aerofoil section may be placed above the surface with the jet aimed at the aerofoil.  This would cause an area of low pressure below the aerofoil.

High pressure air jet moved along, or across, scored line in film under test

2)  Vacuum or suction pump.

In this method a lifting force is applied to the film under test by means of suction.  The working medium may be either air, i.e. a vacuum or a liquid if a higher force is required.  Where the suction causes a separation of the film without rupture it may be necessary to use a clear tube or pressure vessel so that "ballooning" of the film can be detected visually.  Alternatively a simple rub test could be used after suction is removed.

For example

a)      Simple vacuum pump with collection bag

b)      Suction pump

Movement of the plunger holds the pump tight against the test sample providing a seal via a sealing lip on the rim of the pump.  The vacuum above the piston is transferred to the chamber above the sample by a pressure tube.  The vacuum is controlled to a repeatable level by a regulating valve.

The working fluid...