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Sunday, 21 July 2019

Adhesion test

4 Posts

Wednesday 31 May 2000 1:00:00 am

What standard (ISO, ASTM, or other) is available for testing adhesion of inks (U.V. or epoxi) on plastics (PE or PP)? Thanks in advance.

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Thursday 08 June 2000 1:00:00 am

Sorry, this might not be of great help, but I believe that the scotch tape test should be enougth, but lso depends on the application and the final product.
Regards.

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Sunday 09 July 2000 1:00:00 am

A wide variety of tests are available for testing the properties of printed plastics .
The number and type needed to be carried out on any particular printed plastic article depends greatly on the type of plastic (Rigid or Flexible) and the application or end use identified for the article. Some of the tests are numerical, while others are comparative, ie non-quantifiable, they depend on comparing test results from batch to an agreed reference standard, the batch test result will be simply a pass or fail compared to standard. For flexible plastics - eg Plastic Film Printing used in the Packaging Industry, the following tests are normally carried out in addition to the ink adhesion test.
*Gloss - 60 degree
*Rub Resistance - BS3110:1959
*Crease resistance
*Tape adhesion
*Finger-nail scratch resistance
*Flexibility
*Slip resistance
*Blocking resistance-Heat+Pressure
*Chemical resistance -BS4321:1969
*Lightfastness - BS4321:1969 Blue Wool Scale
*Heat Resistance
*Deep freeze resistance
*Solvent retention
*Odour and taint
*Laminating and over-varnishing
For determining ink to substrate adhesion, the following three tests outlined below should be carried out on test specimen and then compared to results from an agreed reference standard (Supplied by potential customer?)
Scotch Tape Adhesion Test:
A length (Four inches - 100mm) of standard Scotch tape is placed on the printed area, and smoothed down with the thumb. One end is then lifted and pulled back gently about one inch. This loose end is then gripped between forefinger and thumb and yanked back rapidly for the remainder of its lenght. The print under the tape is then examined for ink removal, and the tape for ink transfer. Repeat above procedure for reference standard, then compare results - test result should ideally be as good as the standard.
Flexibility Test
The printed film is held firmly between the thumb and forefingers of each hand with about half an inch of loose foil i between the hands, and flexed 10 times. The printed foil is then examined for any ink removal.
Fingernail Scratch Resistance
A length of printed foil is placed printed side upwards on a flat surface. The print is then repeately scuffed with the back of the fingernail, then examined for ink removal by abrasion.

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Wednesday 12 July 2000 1:00:00 am

Ask the following specialists:
TESTPRINT Leeuwarden Netherlands:
http://testprint.com
They supply test equipment for adhesion etc.and should know all available methods,
regards,
Rolf Wieland

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