Heat Resistance of Printing Inks

1.0 PURPOSE

1.1 To define a test method for determination of the heat resistance of printing inks.

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: Nil

6.2 Abbreviations

6.2.1 HR: Heat Resistance

7.0 PROCEDURE

7.1 For Raw Materials – Inks

7.1.1 Take the suitable substrate for which the ink is intended. In case of inks for foil printing, take washed Blister / Strip Aluminium foil, place it on the bar-coater pad, and clamp.

7.1.2 Apply a few drops of ink or toner on the foil-washed surface of the substrate and take the drawdown using the bar coater.

7.1.3 Dry the coated sample of aluminium foil in the oven at 75 ± 10°C for 10-12 seconds.

7.1.4 Set the desired temperature of the Heat-Sealing Machine as per the ink specification; the dwell time at the sealing jaw is 1 second.

7.1.5 Fold the ink-coated Blister / Strip Aluminium foil with Paper / Bare Aluminium foil in such a way that the ink-coated surface of the foil comes in contact with the paper / bare foil.

7.1.6 Carefully place the folded material in between the heat-sealing jaw.

7.1.7 Apply pressure of the sealing bars using the switch.

7.1.8 Remove the sample from the sealing jaw.

7.1.9 Visually observe that the ink should not get transferred onto the paper / bare foil. Minor traces of the sealing jaw knurling shall be considered as result pass.

7.2 For Surface Printed Substrate

7.2.1 Fold the surface-printed substrate with Paper / Bare foil in such a way that the printed surface of the foil comes in contact with the paper / bare foil.

7.2.2 Carefully place the folded material in between the heat-sealing jaw.

7.2.3 Apply pressure of the sealing bars using the switch.

7.2.4 Remove the sample from the sealing jaw.

7.2.5 Visually observe that the ink should not get transferred onto the paper / bare foil. Minor traces of the sealing jaw knurling shall be considered as result pass.

8.0 REVISION HISTORY

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