GB/T 31125-2014Test method of adhesive tapes—Loop tack (English PDF)

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.

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 Method A: Tensile testing machine method

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.

7 Method B: Automatic loop tack testing machine method

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 […]