The test principle and method of the initial viscosity tester

The initial viscosity tester is suitable for the initial viscosity test of pressure-sensitive tape, medical patches, self-adhesive labels, protective films and other related products, and has two test methods: A bevel ball method and B inclined groove ball method, and the
conversion method is simple and easy.

CZY-G initial viscosity tester Initial viscosity tester test principle: the use of bevel rolling ball method, through the steel ball and pressure-sensitive tape specimen adhesion surface with a small pressure in the short contact, the adhesive tape to the steel ball adhesion effect to test the initial viscosity of
the specimen.

Test method: 1.
The test device will be mainly composed
of inclined plate, base, stainless steel ball and catch box and other parts.

The inclined plate (inclined angle of 15°, 30" or 45°) is a stainless steel super-trace plate
about 2mm thick.

The plate is painted with two marks on the horizontal line separated by 10mm and the starting position of the steel ball is marked on the lower line for the fixed test product: the base should be able to adjust and maintain the horizontal state of the device; The catcher box is used for the steel ball that rolls off the plate, and its inner wall should be lined with soft material; The number and specifications of the stainless steel ball should comply with the provisions in the
table.

2.
Before the assay test, the plaster and patch (together with the packaging material> should be placed for more than
2 hours under the conditions of 18-25C and the humidity of the phase complex cloud 40% to 70%.

Scrub the surface of the inclined plate and the stainless steel ball with a wiping material dipped in anhydrous ethanol, carefully dry it with a clean dust-free cloth, and so repeatedly clean more than 3 times until the surface of the inclined plate and the stainless steel ball are clean by visual inspection
.

Adjust the inclined plate according to the inclination angle specified under each variety, take 3 pieces of the sample product, and fix the test product backing with double-sided tape on the inclined plate respectively, of which the upper end of the test product should be located at the horizontal line of the inclined plate, the viscosity is facing up and the experimental length along the slope direction does not exceed 5cm, and the test product should be flatly bonded to the
plate.

Place the steel balls specified under each variety on the horizontal line and fall
freely from the slope.

3.
The results determine that if 3 of the steel balls that are each adhered to by the 3 test products are the largest steel ball number or 2 are the largest steel ball number, and the other steel ball number is only one smaller than the other ball, in line with the regulations: if one is the largest steel ball number, and the other two steel ball numbers are only one small one, then three pieces of re-test should be taken, and the 3 pieces can stick to the maximum ball number The steel ball is in line with the regulations
.