Ink & VMCH Adhesion

1.0 PURPOSE

1.1 To define a test method for determination of good bond strength between Printing Ink / Coating and VMCH with the substrate.

2.0 SCOPE

2.1 This STM applies to the Quality Control department.

3.0 REFERENCE(S) & ATTACHMENTS

3.1 References

3.1.1 In-house

3.2 Attachments

3.2.1 Nil

4.0 RESPONSIBILITY

4.1 QC Department Person

4.1.1 To carry out the testing as per the STM.

4.2 QC Department Head:

4.2.1 To prepare and ensure the implementation of the STM.

4.3 QA Head:

4.3.1 To approve the new or revised STM, and to ensure the implementation of the defined system.

5.0 DISTRIBUTION

5.1 Quality Assurance

5.2 Quality Control

6.0 DEFINITION(S) & ABBREVIATION(S)

6.1 Definitions

6.1.1 Ink Adhesion: The Ink / Toner should have strong bonding with the substrate to maintain the integrity of the printed substrate. Weak bonding may result in peeling off of the printed layer.

6.2 Abbreviations: Nil

7.0 PROCEDURE

7.1 Shellac Washed Aluminium Foil

7.1.1 Cut an A-4 size of the washed aluminium foil.

7.1.2 Place the aluminium foil (facing washed side) on the bar-coater pad.

7.1.3 Apply the ink / toner on the foil-washed surface.

7.1.4 Take drawdown of the ink / toner on the pad.

7.1.5 Place the ink / toner coated aluminium foil in the electric oven, which has been preset at 80 ± 10°C, for 10-12 seconds.

7.1.6 Remove the dried sample from the oven and place it on a flat sample-testing table.

7.1.7 Take a transparent cello tape (TACO make) of 18 mm width and stick it on the coated side across the width of the sample firmly.

7.1.8 Wait for at least 2 minutes and jerk off at approximately 45° angle, then observe the peel-off of ink from the foil.

7.1.9 The test passes if no ink is lifted from the foil onto the transparent TACO tape.

7.1.10 In case the test fails, initiate investigation into the process and report the findings to the QC Head for further action.

7.2 Printed Substrate

7.2.1 Place the printed sample on a flat table.

7.2.2 Take a transparent self-adhesive tape (TACO make) of 18 mm width and stick it on the ink side across the width of the sample firmly.

7.2.3 Wait for at least 2 minutes and jerk off at approximately 45° angle, then observe the peel-off of ink from the foil.

7.2.4 The test passes if no ink (about 98%) is lifted from the foil onto the transparent TACO tape.

7.2.5 In case the test fails, initiate investigation into the process and report the findings to the QC Head for further action.

7.3 Adhesion of VMCH

7.3.1 Place the coated sample on a flat table.

7.3.2 Take a transparent self-adhesive TACO tape of 18 mm width and stick it on the coated side across the width of the sample firmly.

7.3.3 Wait for at least 2 minutes and jerk off at approximately 45° angle, then observe the peel-off of VMCH from the foil.

7.4 Rate of Pulling: The rate of pulling of the transparent self-adhesive TACO tape may be classified as follows:

7.4.1 Soft pull: Slow rate of pulling (approx. 50 mm per second).

7.4.2 Medium pull: Moderate rate of pulling (approx. 100 mm per second).

7.4.3 Hard pull: Fast rate of pulling (faster than 150 mm per second).

Power Ltd. and the Customer.

7.4.5 In case there is no agreement, soft pull shall be considered as standard.

8.0 REVISION HISTORY

+---------------+---------------+---------------+---------------+---------------+---------------+ | Revision | 00 | Effective | | CC No. | | | No. | | Date | | | | +---------------+---------------+---------------+---------------+---------------+---------------+ | Details of revision: New SOP | +-----------------------------------------------------------------------------------------------+