Back to Library·Unwinding Direction
Quality Control
Beginner
Last updated: Jul 8, 2026
Official signed PDF · SIPL/STM/009
The authoritative document as issued. View or download below.
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Unwinding Direction

1.0 PURPOSE

1.1 To define a test method for determination of the unwinding direction of printed rolls.

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 Remove the layer of the roll. Check the printing matter direction while unwinding.

7.2 Determine the unwinding direction as "Readable", "Un-Readable", "Back Panel Readable", "Eye mark LHS", etc., which is unique and can be identified easily.

7.3 Match the result with the standard.

8.0 REVISION HISTORY

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

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