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GB/T 31125-2014 English PDF (GBT31125-2014)

GB/T 31125-2014 English PDF (GBT31125-2014)

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GB/T 31125-2014: Test method of adhesive tapes -- Loop tack

This standard specifies a test method for determining the initial tack of adhesive tapes, by the loop tack method. This standard applies to the determination of the initial tack of adhesive tapes. It can be used for product quality control and research.
GB/T 31125-2014
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.180
G 38
Test method of adhesive tapes - Loop tack
ISSUED ON: SEPTEMBER 03, 2014
IMPLEMENTED ON: JANUARY 01, 2015
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 4
4 Principles ... 4
5 Categories ... 5
6 Method A: Tensile testing machine method ... 5
7 Method B: Automatic loop tack testing machine method ... 9
Test method of adhesive tapes - Loop tack
1 Scope
This standard specifies a test method for determining the initial tack of adhesive tapes, by the loop tack method.
This standard applies to the determination of the initial tack of adhesive tapes. It can be used for product quality control and research.
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) is applicable to this standard.
GB/T 2523-2008 Measuring method of surface roughness and peak count for cold- rolled metal sheet (strip)
GB/T 3280-2007 Cold rolled stainless steel plate, sheet and strip
GB/T 22396 Terminology relating to pressure sensitive adhesive products 3 Terms and definitions
The terms and definitions as defined in GB/T 22396, as well as the following terms and definitions, apply to this document.
3.1
Loop tack
The separation force, after contacting a loop adhesive tape material (adhesive side outwards) with a standard test panel of a certain area, at a certain speed. 4 Principles
The loop adhesive tape is brought into contact with the test panel of the specified area, under the action of its own weight, to measure the force to pull the adhesive tape away from the test panel
6.3.1 Specimen ring
6.3.1.1 Size of specimen ring: Width 24 mm, circumference 175 mm.
6.3.1.2 Number of specimen rings: At least 3.
6.3.1.3 If the test sample is an unsupported adhesive tape, it is necessary to transfer the sample to a 0.05 mm PET film, to make a specimen ring. The PET film is used here as the support carrier, for the unsupported adhesive tape.
6.3.2 Test panel
6.3.2.1 The thickness of the stainless steel test panel is 1.5 mm ~ 2.0 mm; the width is 24 mm; the length is 100 mm.
6.3.2.2 The material of the stainless steel test panel is the 0Cr18Ni9 or 1Cr18Ni9Ti test panel, which is specified in GB/T 3280-2007. The surface roughness (GB/T 2523-2008) is (50 ?? 25) nm. When there is permanent contamination or scars on the surface of the test panel, replace it in time.
6.3.2.3 If PVC, ABS, PE, glass materials are used for the test panel, the material and surface conditions shall be stated in the test report.
6.3.2.4 The stainless steel test panel, which is fixed by the fixture, shall be able to accommodate the bonding area of 24 mm ?? 24 mm.
6.3.3 Cleaning agents and wiping materials
6.3.3.1 Cleaning agent
One or more of the following solvents:
- Diacetone alcohol (4-hydroxy-4-methyl-2-pentanone);
- Isopropyl alcohol;
- Methanol;
- Methyl ethyl ketone;
- Acetone;
- N-heptanone;
- Mixture off n-heptane and a fluorinated hydrocarbon (e.g.: refrigerant) (applicable under conditions of toxicity or flammability restrictions).
Solvents are of common chemical grade AND placed in suitable containers. 6.4.8 The failure modes of the bonding between the specimen ring and the test panel are divided into three cases: interface failure, cohesive failure, transfer failure. 6.4.9 After the test is completed, use reagents, to clean the stainless steel test panel in the test fixture. Use dust-free cloth to cover the stainless steel test panel, to prevent the surface from being scratched.
6.5 Test results
From the adhesive tape sample, collect the data from at least three specimen rings. The initial viscosity shall be expressed as the average value of the maximum tensile force of the specimen rings, in the unit of N.
6.6 Test report
The test report contains the following items:
a) Test methods;
b) Information of adhesive tape sample;
c) Reagents and cleaning methods used for cleaning stainless steel sheets; d) Dwelling time of sample;
e) Type and thickness of adhesive tape, unit: mm;
f) Support material for the adhesive tape;
g) Release paper used for adhesive tape;
h) Dwelling time during the test of the specimen ring;
i) Average value of tensile force, unit: N;
j) Visual failure mode;
k) Non-standard test conditions.
7 Method B: Automatic loop tack testing machine method
7.1 Test devices
Figure 5 is a schematic diagram of an automatic loop tack performance testing machine. 7.4.2 Turn on the power switch.
7.4.3 Confirm that the upper gripper is at the topmost position.
7.4.4 Loosen the fixing screw. Then remove the stainless steel test panel. 7.4.5 Put the cleaned stainless steel test panel back into the test fixture. Tighten the fixing screws.
7.4.6 Peel off the release paper, which covers the specimen.
7.4.7 Turn the specimen completely over, taking care not to crease it. Bend the specimen into a teardrop-shaped annular specimen ring, which has a perimeter of 98 mm. The adhesive side faces outside, as shown in Figure 6.
7.4.8 Use a 13 mm wide adhesive tape, to fasten the ends of the specimen ring together. 7.4.9 Insert the specimen ring into the upper gripper, to ensure that the specimen ring is in the proper position, to form the upper assembly.
7.4.10 Zero the dynamometer, according to the manufacturer's instructions. 7.4.11 Long press the "Inching" button, to make the upper assembly start to move downwards. The upper assembly stops automatically, after completing a complete cycle. At this point, the dynamometer returns to its initial position.
7.4.12 A complete cycle begins with the upper assembly moving down; the specimen ring contacts with the test panel, to form a bond. Then, the assembly is moved upward, at a speed of 300 mm/min ?? 10 mm/min. The dynamometer records the tensile force, which is required to pull the specimen ring away from the test panel. At the end of a

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