For self-adhesive products on the market today such as labels, barcodes, signs and other products. Whether using companies or manufacturers, they have many doubts about their testing methods. Most of them know that they need to test the viscosity of self-adhesive. In fact, the viscosity of self-adhesive mainly consists of three indicators: initial tack, sustained tack, and bonding strength. Here we sit down and discuss its detection methods. \x0d\\x0d\ (1) Situation: When labeling self-adhesive labels on automatic labeling machines, many manufacturers have found that corners often appear. \x0d\\x0d\ Reason: Problems with initial tack, instant adhesion Not strong\x0d\\x0d\ Test method: According to GB4852 pressure-sensitive adhesive tape initial tack test method (inclined rolling ball method), by using the inclined plane rolling ball method, through the steel ball and the sticky surface of the self-adhesive label sample When brief contact occurs with slight pressure, the adhesion of the label to the steel ball is used to test the initial tack of the sample. \x0d\\x0d\ Result: There are 33 standard steel balls in a set, and the initial tack is represented by the model of the largest steel ball whose label can stick \x0d\\x0d\ Instrument used: Initial tack tester \x0d\\x0d\ (2) Situation: Many people find that after the label is attached, it falls off by itself after a short time, and it loses its stickiness. \x0d\\x0d\ Reason: The problem with stickiness is poor retention.\x0d\\x0d\ x0d\\x0d\ Test method: According to the GB4851 pressure-sensitive adhesive tape holding tack test method, use a 2kg standard pressure roller to press the labels on two test boards, and hold the test board with the adhesive sample vertically Hang it on the test frame, and hang a weight of 1 kilogram from the lower end of the other test plate. \x0d\\x0d\ Result: The ability of the adhesive to resist pull-off is characterized by the displacement of the sample after a certain period of time, or the time for the sample to completely detach. \x0d\\x0d\ Instrument used: Adhesion tester\x0d\\x0d\ (3) Situation: The attached label is easily peeled off and the adhesive strength is low\x0d\\x0d\ Reason: Peeling off The strength is too small\x0d\\x0d\ Test method: According to the GB2792 pressure-sensitive adhesive tape 180? peel strength test method, use a 2kg standard pressure roller to bond the label to the cleaned test plate, and fold the free end of the sample in half 180° and peel off the adhesive surface from the test panel. \x0d\\x0d\ Results: The peel strength (kN/m) was recorded and calculated by the peel testing machine. \x0d\\x0d\ Instrument used: Electronic peel testing machine