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GB/T 10006-1988 English PDF (GBT10006-1988)

GB/T 10006-1988 English PDF (GBT10006-1988)

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GB/T 10006-1988: Plastics. Film and sheeting. Determination of the coefficients of friction

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GB/T 10006-1988 (Renamed from GB 10006-88)
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
GB 10006-88
ISO 8295-1986
Plastics - Film and sheeting - Determination of the
coefficients of friction
APPROVED ON: JANUARY 12, 1988
IMPLEMENTED ON: MAY 01, 1988
Issued by: Ministry of Light Industry of PRC
Table of Contents
1 Subject content and scope of application ... 3
2 Normative references ... 3
3 Terms and symbols ... 3
4 Principle summary ... 4
5 Test device ... 4
6 The influence of inertia ... 6
7 Specimens and their preparation ... 6
8 Standard environment for conditioning and test of specimens ... 7
9 Test procedure ... 7
10 Presentation of test results ... 8
11 Test report ... 9
Additional information ... 10
Plastics - Film and sheeting - Determination of the
coefficients of friction
This standard identically adopts the international standard ISO 8295-1986 "Plastic - Film and sheeting - Determination of the coefficients of friction". 1 Subject content and scope of application
This standard specifies the methods for determining the static friction coefficient and dynamic friction coefficient, when plastic films and sheets slide on the surface of themselves or other materials.
This standard is applicable to the following non-adhesive plastic films and sheets, which have a thickness of below 0.2 mm.
2 Normative references
GB 2918 Plastics - Standard atmospheres for conditioning and testing
GB 3360 Statistical interpretation of data - Estimation of the mean -
Confidence interval
3 Terms and symbols
3.1 Static frictional force
The maximum resistance of the two contact surfaces, at the beginning of the relative movement, which is expressed by Fs.
3.2 Dynamic frictional force
The resistance, when two contacting surfaces move relative to each other at a certain speed, which is expressed by Fd.
3.3 Normal force
The force, which is applied perpendicularly to two contacting surfaces, expressed by Fp.
3.4 Static coefficient of friction
length direction of the specimen (i.e., the test direction) shall be parallel to the longitudinal direction (machining direction) of the sample.
7.4 Requirements for specimens and test surfaces
7.4.1 The specimen shall be flat, free of wrinkles or scars that may change the friction properties. The edges of the specimen shall be rounded and smooth. 7.4.2 The test surface of the specimen shall be free of dust, fingerprints, or any foreign matter, that may change the surface properties.
7.5 Number of specimens
At least three pairs of specimens are measured for each test.
If higher test accuracy is required, the number of specimens shall be increased, according to GB 3360.
8 Standard environment for conditioning and test of
specimens
The state of the specimen shall be conditioned, for at least 16 h, under the standard environment, which is specified in GB 2918. Then test is carried out in the same environment.
9 Test procedure
9.1 Measurement of film (sheet) versus film (sheet)
9.1.1 Fix a specimen on the horizontal test bench flatly; the test face is upwards. The specimen shall be parallel to the length direction of the test bench. 9.1.2 Place the test surface of the other specimen downward; wrap the sliding block; use tape to fix the specimen on the front and upper surface of the sliding block.
9.1.3 If the specimen is thick or rigid, it is possible to produce a bending moment, which makes the pressure distribution uneven, THEN, it shall use the 63 mm x 63 mm specimen, which is specified in 7.1.2. Use double-sided tape to fix the specimen, BETWEEN the bottom surface of the sliding block AND the non-test surface of the specimen.
9.1.4 Both fixed specimens shall meet the requirements of 7.4.
9.1.5 Place the sliding block, which holds the specimen, in the center of the first 10.2 Dynamic coefficient of friction
The dynamic coefficient of friction is calculated by formula (3):
Where:
??d - Dynamic coefficient of friction;
Fd - Dynamic frictional force, N;
Fp - Normal force, N.
10.3 Calculate the arithmetic average of static coefficient of friction and dynamic coefficient of friction, according to clause 1.1 of GB 3360. Take three significant figures. Calculate the standard deviation, according to clause 2.1.1 in GB 3360. Take two significant figures.
11 Test report
The test report shall include the following parts:
a. This national standard number;
b. Description of the type and production date of the test sample;
c. Test surface and direction;
d. If the specimen of other materials are used, a detailed description of the surface;
e. The average value of the static coefficient of friction and the dynamic coefficient of friction. If necessary, indicate the value of each
measurement, the standard deviation, the number of tests;
f. Test date;
g. Inconsistency BETWEEN the specimens and tests AND this standard, OR
the conditions which are not specified in this standard.
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