This standard is applicable to the determination of low speed unwinding strength of pressure-sensitive adhesive tapes without release layer in roll form. GB/T 4850-2002 Determination of low speed unwinding strength of pressure-sensitive adhesive tapes GB/T4850-2002 Standard download decompression password: www.bzxz.net

1CS83.180
National Standard of the People's Republic of China
GB/T 48502002
Test method for unwinding force of pressuresensitive adhesive tapes at low speed2002-05-29Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
2002-12-01Implementation
GB/T4850-2002
This standard is equivalent to A31M381:199 Pressure-sensitive tape unwinding test method: Wood standard and ASTMS11 difference
(1) State Fire Broadcasting\Pole\This year, according to the provisions of the Chinese standard, this part of the content is specified in the product standard (2) Due to the lack of comparison data between the test rooms, the "precision and deviation" are not listed! (3) The time for state adjustment. The provision that "the specimen with only temperature requirement should be not less than 2h" is added: The difference between the standard and the previous standard;
(1) The time for state adjustment. The provision that "the specimen with only temperature requirement should be not less than 2h" is added. For the specimen with both temperature and temperature requirements, it should be placed under the specified conditions for more than 24h" is added: () The maximum force obtained during the decomposition process is taken as the decomposition force of the test object. This standard replaces GB/T48EC-1984 from the date of implementation. This standard is proposed by Ningshi Chemical Industry Association and is under the jurisdiction of the National Adhesive Standardization Technical Committee. Drafting unit of this standard: Shanghai Rubber Products Research Institute. Main drafters of the standard: Tian Guodong, Xia Zhengjun This standard was first issued in 1984.
This standard is entrusted to the National Adhesive Standardization Technical Committee for the preparation of this standard. 1 Specification
National Standard of the People's Republic of China
Determination of the low speed unwinding strength of pressure-sensitive adhesive tapes Test method Far unwinding furec or pressuresensitiye adhesive tapes at lon speed This standard Determination of the low speed unwinding strength of pressure-sensitive adhesive tapes 2 Principle
GB/T 48502002
Generation warning letter /r4x5nR4
Put the test tape on a self-rotating correction fixture and place the fixture on a high-speed testing machine. When the fixture of the testing machine moves at a fixed speed, unwind the test tape by 15mm. The value obtained is taken as the unwinding strength of the adhesive tape and is expressed in /m.
3 Equipment
3.1 The test machine unwinds the sample and loads it within 2C%~% of the test machine standard load. The error of the test machine force value should not be greater than 1. The moving speed of the test machine variable speed is [300±3)-mm/min. It has a device that can automatically record the load before drawing. 3.2 Evaluation optical equipment: Its structure is shown in the figure: The axial rotation force of the R-shaped optical head should be less than 3.? N. [State definition
Momentary film actual
(Yue Contains)
Pa Miscellaneous (Kai Jin:
Broken two unwinding clamp ugly
People's Republic of China Quality Supervision, Inspection and Quarantine General 20020529 approved 2002-12-01 implementation end
GB/T 48502002
Let: The right of the family is the text of the assembly of the tape to the root of the hair-shaped woman with the shaft of the household, then the factory chemical it stop on the capacity tracking effect of the car 21 transmission system of the stop force, the first must be able to drive the release of the transfer printing science 3.3 tools: swimming ten feet. Small points of the big dry 0.C5m. 4 Sample recording sample conditions
4.1 Test width is not big Gmm, pay attention to obvious deformation and deterioration. 4.2 The test room temperature is (23-2 relative temperature 50 ± 1C road 4.3 If the test fence only has a set of requirements for the benefit , remove the packaging material and place it for at least 24 hours as specified in 4.2. If the sample has requirements for lake and humidity, it should be kept for more than 24 hours under the conditions specified in 4.3. 5 Test steps
5.1 Measure the width of the sample at a roughly evenly divided point on the surface of the sample and take the arithmetic mean as the width of the sample. 5.2 Except for the sample with a larger than 3-layer adhesive layer, the sample should be placed on the axis to hold the sample tightly. 5.4 Remove about 20 mm of adhesive tape from the test rail by hand and fix its starting end in the upper holder. 5.5 Start the test machine to open about 150 m of adhesive tape at a rate of (300-130) mm/min. 5.6 Test the sample again according to 5.1 to 5.1. The tester should carefully observe the abnormal phenomenon of the sample during the test, such as adhesive migration, cracking or base delamination. 5. Test sample results
3-1 According to the test curve, The maximum number of test strips is taken as the test strip strength =
where: H, VF/mm
, sample width. bzxZ.net
Let's record the test strip strength and the maximum value. The test report should include the following:
) The standard number of the test strip:
) The name of the test strip, sample type, source, sample quantity, production batch number, test date, etc.! ) Test results:
) Observations on the performance of the test strip, such as adhesive migration, tearing and delamination of the material: ) Safety instructions:
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