Ball Tack Test

CS Cheimcal Test Methods

Ball Tack Test

Pressure sensitive tape is used in a variety of applications including duct tape,
electrical tape, masking tape, packaging, double-sided tape, bandages,
medical devices, and other uses.

CS Chemical Test Methods

The initial adhesion(tack) is one of the three a property of matter of the compression sensitizing agent, and is stated in ASTM, JIS, etc. as ‘a function in which the adhesive surface can be bonded in a short time under its own small pressure without using energy such as solvents and heat on the surface of the attachment’. Because the tack is combination of the chemical and physical properties of the adhesive surface in contact with the adhesive are combined, the tack also provides information that can identify and predict the adhesives’ functions in the basic properties and actual applications of the adhesive and the adhesives. There are many ways to evaluate the tacks, such as rolling ball test (RSTC), probe take test (ASTM), and inclined ball take test (JIS).

Testing Procedure

Test specimen

Using an angular meter, hold the oral device horizontally on the measuring stand and adjust the angle of the sloping plate. Usually set at 30 degrees.

Test specimen

Test plate

With the adhesive side of the test piece to be tested facing up, the upper part is taped and the lower part is fixed to the inclined plate by a weight. Adjust the length of the ball rolling by attaching the cast polyester film to the fixed position on the adhesive surface of the test specimen. At this time, should be avoid air bubbles enter the film or avoid wrinkles.

Test plate

Ball preparation

Preserve the ball in the solvent in advance to keep it out of reach, at this time, Care must be taken with pincette, etc. to prevent scratches on the cheeks, clean the ball in accordance with the cleaning method specified in JIS and place it in the starting position at the top of the old device and slowly roll the ball by opening the gate.

Ball preparation

Measurement

The starting position, the cleaning of the ball, and the operation of the ball roll are repeated in different sizes, find the ball number that is the largest in the ball (when the ball is not moving for more than 5 seconds) in the measuring area. A total of three balls of the ball, the maximum ball number found after the test in the same test piece and the ball number of the size before and after it, are rolled once to compare if they match the ball of the maximum ball number before the test.

Measurement

Ball numbers are specified in JIS B 1501, the maximum ball number found is adopted as a result and the average of the results of Chapter 3 is the result. Store used balls in solvent. Replace the ball with a new ball if the ball has any scratches or rust.

Measurement

Result

The angle of the sloping plate should always be added to the result. The standard angle of the sloping plate may change from 20° to 40° depending on the characteristics of the test piece or 30° as mentioned above. In addition, the ball start position must be constant in length of 100mm for the entire ball to roll, even if the ball size changes.

Result