Talking about the testing principle and method of pressure-sensitive tape initial tack tester
Pressure-sensitive tape is commonly known as non-drying tape. It has the characteristics of easy adhesion under low pressure, adhesive effect in a short time, no contamination of the adherend after peeling, and re-correction when it is misplaced, and it is used repeatedly. The reason why the adhesive performance of the back surface is basically not affected and the operation is convenient. The pressure-sensitive adhesive tape partially replaces the traditional mechanical fixing and the method of using adhesives, such as transparent tape for sealing boxes, electrical tape for wire insulation, rubber tape, etc. With the development of polymer chemistry, the progress of adhesive technology and processing equipment, tape has been widely used in packaging, printing, automotive, home appliances, electronics, medical, aviation, construction, telecommunications equipment and other industries, so in many goods and places Increasingly, adhesive products are used in places that are not visible to the naked eye.
Initial tack is a property of the adhesive, which can make the adhesive with measurable strength under low pressure immediately after the adhesive contacts the adherend. The initial tackiness of the adhesive has important practical significance for some applications.For example, in the shoemaking process, the neoprene adhesive for shoes has good initial tack performance, which has a worse adhesive quality for the final shoe. Great relationship. The initial adhesion performance of the pressure-sensitive adhesive tape is particularly important for the practicality of the pressure-sensitive adhesive tape. In the following, we will introduce in detail the initial tack test method of pressure-sensitive adhesive tape and the related instruments used.
China's standard GB / T 4852-84 "Test Method for Initial Tack of Pressure-Sensitive Adhesive Tapes (Slanted Ball Method)" specifies the initial test method for adhesive tapes. The main point of this method is: at a slope of 30 ° The upper end of the slanted surface is a 100mm long roll-up section with a polyester film bottom, followed by a test section with a length of 100mm and the bottom of the test pressure-sensitive adhesive tape. From the upper end of the roll-up section, roll down a steel ball with a certain diameter and mass in a static state to see if it can be stuck in the test section after passing through the roll-up section. Obviously, large steel balls are not easy to be stuck. The diameter of the steel ball is from 1/32 inch to 1 inch. There are 33 kinds of steel balls in a series.
The initial tack test using the beveled ball method is fast and easy to operate, requires little equipment investment, and does not require high proficiency in operation. "Test Method (Slanted Rolling Ball Method)" has been implemented for more than ten years and has achieved good economic and social benefits. This test method should be mainly used for quality control, and the experimental requirements are relatively high: (1) the thickness of the adhesive layer of the pressure-sensitive adhesive tape to be tested is kept constant; (2) the adhesion of the adhesive to the backing material does not cause problems; C) The stiffness of the backing material does not affect the adhesion of the pressure-sensitive adhesive tape. Then the initial tack test of the bevel rolling ball method can have good repeatability, and it can also detect the changes between batches of products in production.