Heat Seal Ability Test

1.0 PURPOSE

1.1 To define a test method for determination of the heat seal ability of Coated / Laminated Foil and other laminates.

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: Nil

7.0 PROCEDURE

7.1 The heat seal strength of HSL-coated / laminated aluminium foil and other laminates determines the seal ability of the foil to ensure proper bonding with PVC or LDPE film.

7.2 In case of HSL-coated foil, the HSL side of the substrate should be sealed with the film side, with the following machine parameters:

7.2.1 Heat Sealing Machine

Parameter Value

Temperature – Blister Foil 180 to 200°C

Temperature – Strip Foil / Laminate 140 to 160°C

Dwell Time 1 second

Pressure 2 Kg/cm²

Strip Width 15 mm

7.3 The heat seal strength is determined on the Sealing Strength Tester.

7.3.1 Clamp the stiffer layer of the 15 mm sealed strip on the upper side and the thinner layer on the lower side of the clamping assembly.

7.3.2 Separation angle: 180°.

7.3.3 Acceptance criteria: As per specification.

8.0 REVISION HISTORY

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