GB/T 9858-2009Method for determining the folding endurance of photographic film and film base (English PDF)

Foreword

This standard replaces GB/T 9858-1988 "Determination of film base and folding of the film." This standard compared with GB/T 9858-1988, the main changes are as follows.

--- The "subject matter and scope" to "Range" (Excerpts Chapter 1, Chapter 1 of the 1988 edition);

--- "Reference standard" to "normative references" chapter (Chapter 2 of this edition, the 1988 version of Chapter 2);

--- "Term" to "Terms and Definitions" (Excerpts Chapter 3, Section 3 of the 1988 edition);

--- Chapter 6, "Environmental conditions" with reference to GB/T 2918 were clearly defined (Chapter 6 of this edition);

--- Chapter 7, "Sample Preparation" will "clip the full width of 30cm as a sample" to "take along the full width of the film base longitudinal sample a 30cm" (Chapter 7 of this edition).

1 Scope

This standard specifies the base sheet and film folding Determination (MIT folding tester method) principles, instrumentation and test procedures.

This standard applies to cellulose triacetate film base or polyester base film base as well as those in support of the photosensitive film body (with the backing layer Folding or without the backing layer, processed or unprocessed) measurement.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments or revisions do not apply to this standard, however, whether these files can be used to encourage the parties in accordance with this standard agreement The latest version. For undated reference documents, the latest versions apply to this standard.

GB/T 2918 plastic sample conditioning and testing of the standard environment

5626 ISO.1993 Determination of folding paper

3 Terms and Definitions

The following terms and definitions apply to this standard.

4 Summary

Under test conditions, with the MIT folding device, the width of the base sheet or film samples of 15mm, subject to certain tension in a At a given speed, for 135 ° folding back and forth until the fracture, get back and forth from the counter number of readings, and then calculate the base sheet or film resistance Fold degrees.

5 Test Equipment

6 Environmental Conditions

Before the test, the samples should be stored for some time under the conditions recommended by the manufacturer. If the product is not recommended storage conditions, should follow