GB/T 8942-2016Paper—Determination of softness (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard replaced GB/T 8942-2002 Paper - Determination of Softness.

Compared with GB/T 8942-2002, this Standard has the major changes as follows.

--- Increase the principle of softness measurement;

--- Add the description of the sample placement when measuring the softness in the longitudinal and lateral directions; and the converting method and examples of the softness when the sample size is less than 100mm×100mm;

--- Adjust the length of the plate-shaped probe from the original 240mm to no less than 120.0mm;

--- Delete the terms of softness;

--- Delete the Appendix A.

1 Scope

This Standard specifies the method of using the hand-feeling softness tester to determine the softness of paper.

This Standard is applicable to various wrinkle toilet paper, tissue paper and its derivatives, as well as other papers that require softness.

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 450 Paper and Board--Sampling for Testing

3 Principle

Under the specified conditions, when the plate-shaped probe presses the sample into the slit to a certain depth (about 8mm), the instrument records the sum BETWEEN bending resistance force of the sample itself AND the maximum vector of the friction force of sample and the slit, which is called the softness of the sample; the smaller the instrument indication value is, the softer the sample.

4 Apparatus

5 Sample Preparation

5.1 The sample shall be taken as per GB/T 450; it shall be subjected to the temperature and humidity treatment as per GB/T 10739.

5.2 According to the actual number of layers of the product, cut the sample into the size of 100mm×100mm. If the sample size is less than 100mm×100mm, try to cut he maximum size; the size deviation shall not exceed ±0.5mm.

6 Test Procedures

6.1 Start and preheat the instrument; then calibrate the instrument as per the instrument manual.

6.2 Place the sample on the middle of the test bench; and make it as symmetrical as possible to the slit.

6.3 Test the remaining samples as per 6.2; separately test 10 effective data in the longitudinal and lateral directions. The samples shall be tests 5 facing up and 5 facing down in each direction.

7 Calculation of Results

The results shall be expressed by the arithmetic mean of the test results in the longitudinal and lateral directions, in millinewtons, and rounded off to integers.

8 Test Report

The test report shall include the following contents. […]