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Test description

The underpacking adhesive foil of Policrom Screens Spa, Polipack AA, was examinated and compared with the reference foils of Folex (Samples received from company Streb).
The scope of this test is to evaluate the performance of the adhesive of these foils.
The exterior aspect, the adhesive peelability strength, and the resistance to shear were detected and compared in this test. The last characteristic is the most important for the underpacking foils used onto the sheet-fed and the high speed web offset presses.

The foils have to be repositionable, yet ensures a high shear and allows an easy removal from the cylinder without leaving residues onto it after use.

 
Supplied materials
type   Size thickness
      mm mil
Polipack AA-MT Policrom Screen spa - 0.18 0.007
Polipack AA Policrom Screen spa - 0.16 0.006
Polipack AA-MT Policrom Screen spa - 0.23 0.009
H55-RB Folex A4 0.18 0.007
H45 Folex A4 0.16 0.006
H45-RB Folex A4 0.23 0.009
 
Carvico (BG), 28 march 2007
The results about the product’s performance during these tests are very accurate, however, only to be considered as a general guide to material properties and not as a guarantee. The use of this report is internal of Policrom Screens Spa and its diffusion is subject to prior approval by Policrom Screens Spa
 
Evaluation of exterior aspect:
Each sample has been examined on these points:
•  Surface
•  Coating
•  Protecting paper
•  Laminating
•  Marking
 
 
The results of the aesthetic analysis have the only scope of understand the “quality perception” by the end user.
 
Methods
Type FINAT Test Method no. 1
Peel adhesion (180°) at 300mm per minute
 
Scope
This test method is designed to quantify the permanence of adhesion or peelability of self-adhesive (pressure sensitive) materials.
 
Definition
Peel adhesion is defined as the force required to remove pressure sensitive adhesive material, which has been applied to a standard test plate under specified conditions from the plate at a specified angle and speed. The adhesion strenght is measured 20 minutes after application.
 
 
 
Test Equipment
•  A tensile tester or similar machine, capable of peeling a laminate through an angle of 180°    with a separation speed of 300mm per minute with an accuracy of +/- 2%.
•  Test plate made of stainless steel
•  A standard FINAT test roller.
 
Test Samples

These should be strips taken from a representative sample of material. The strips should be 50 mm wide and have a minimum length of 175 mm in the machine direction. The cuts should be sharp and straight. At least three strips should be taken from each material sample to test.

 
Test Conditions
Temperature 23°C +/- 2°C, 50 % RH +/- 5% RH. The test sample or test strips should be conditioned for not less than 4 hours before testing.
 
 
Procedure
Remove the backing protective paper from each strip and place the sample with the adhesive side down, on to a clean test plate applying a light finger pressure. Roll twice in each direction with the standard FINAT test roller at a speed of approximately 10 mm per second to obtain intimate contact between the adhesive mass and the plate surface. After applying the strips to the test plate, leave for a period of 20 minutes before testing. Fix the test plate and strip in the machine so that the angle of peel is 180°. Set the machine at 300 mm per minute separation speed. Carry out the test. (see fig.1)
 
Results
Peel adhesion (180°) is expressed as the average result for the strips tested in newton per 50 mm width.
 
Notes
The test plates must be thoroughly cleaned so that no trace of adhesive, grease, silicone or moisture is left on the surface.
 
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Copyright © 2010 Bombay Wellprint Inks Pvt. Ltd.
Information reflect on this site is supplied in good faith & is based on our experience in the use of printing inks. Such information is just intended only as a guide and can not be taken as legally binding.