Evaluation of flatness, curvature and wrinkling of plastic films - strip method

A 2.54 m (100 inch) long sheet (film section) is cut into 50.4 (2 inch) wide strips. A lack of flatness or possible curvature, which can lead to wrinkling of the web, is indicated by any differences in length of the individual strips compared to the original total length of the tested film section of 2.54 m (100 inches).

In short — AI-generated

This test evaluates the flatness, curvature, and wrinkling of plastic films by cutting a 2.54m long sheet into 50.4mm wide strips and comparing their lengths to the original length. Any differences in length indicate a lack of flatness or curvature, which can lead to wrinkling. The test is performed using a simple and straightforward method to assess the film's flatness.

The resulting value indicates the degree of flatness or curvature of the plastic film, which is crucial for packaging developers and buyers to ensure proper web handling and printing. A high degree of flatness is essential for maintaining the quality and appearance of the packaging. The test results can be used to optimize the production process and select suitable materials for packaging applications.

Text is AI-generated; based on test method data curated and verified by Innoform.

Test Method Group: Mechanical properties

Norms:

ASTM D 1604 (withdrawn) (1963 (Reapproved 1975)) Flatness of plastic sheet or collapsed tubing
DIN 7277 Planlage-Ebenheit-- NOCH ENTWURF

Required Sample Amount: min. 3 linear meters of the film without kinks, damages etc.

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