钍e ‘loop’ tack value of a pressure sensitive material is expressed as the force required to separate, at a specified speed, a loop of material (adhesive outermost) which has been brought into contact with a specified area of a standard surface (usually glass or metal). An adhesive strip is formed into a loop and held within the jaws of a tensile tester.
然后将其压缩到标准表面上,直到它在指定区域(通常为25mm×25mm)上完全接触。然后将其以固定速度从表面上拉出以建立粘性。
结果是忽略初始峰后的平均张力,并在牛顿中表达。
循环钉测试允许比较不同层压板的“初始抓取”或“申请钉”,并且对于使用自动标签设备的人来说非常有用,其中该属性特别重要。