Performance Studies Of Material Selection And Process Technology For Durable Adhesive Label

Durable label is a very important branch in the self-adhesive label industry.These tags are unique in terms of label structure,material selection,processing,and performance control.Based on the general adhesive structure,the main structure of the durable label is analyzed and introduced.The surface layer is surface material,the middle layer is gum film,and the bottom layer is bottom paper.These three main structural frameworks define the basic attributes of self-adhesive labels,and also determine the performance and processing differences between the different products.At the same time,the application of durability in material selection is discussed,including the relative performance of facing material and base paper.The process of the production of durable labels is analyzed,and the key links of process parameters control are studied.Through the test to identify the key factors affecting the silicon coating effect: roller speed,temperature and weight coated silicon,and the main conclusions: general coating weight is about 1g/m2(CW Ave control at 1gsm),the lower the viscosity of silicone oil,Coverage better,roller temperature has significant effect on coating weight and Coverage,the temperature can improve the coating quality(28°C-30°C),the highest surface temperature can get the best Coverage(printing oven to heat the bottom paper can get better Coverage).The main factors affecting the test results of identification label based on viscous stuck state of dry and clean surface,when the water content labels and labeling the paste rate should be balanced,pressure and Fu labeling standard,the surface temperature of the paste,the paste surface shape.Through the DOE experiment,it is found that the moisture content of the core tube used in the final winding of the finished product has an important influence on the quality of the final winding.The paper tube will conduct water balance with the environment in the environment.The paper fiber will absorb water in the high humidity environment,cause the outer diameter of the paper tube to expand,and produce the outside stress inside the coil core.Thus the tension in the coil has played an increasing role.On the contrary,if the paper fibers lose water in a low humidity environment and the outer diameter is reduced,the internal stress of the coil is released.When the frictional force in the coil is smaller than the threshold of the sliding friction limit,roll loosening occurs.Therefore,the lower moisture content of the paper tube(<8%)in the general winding environment: 25%H-95%H will form water absorption effect.This requires us to control the moisture content of raw paper tubes.Standard oven weighing method(laboratory test)or resistance moisture tester(on-site)can be used for testing.At the same time,control of large weight and narrow range glue small roll hardness difference,the equipment handling all to solve the problem to help bring loose volume.The durability of self-adhesive label films can be studied by means of surface energy test.The dyne method and contact angle or adhesive tape ink transfer method are discussed.Dyne>38 is to ensure that the minimum value of printing ink film materials.Corona treatment,coating printing ink,coating processing,fully mixing of the same color overprint printing ink,repeated replacement of high-power UV lamp,can effectively improve the performance of ink materials.We analyzed the problem of ink loss of durable self-adhesive labels,and finds that the main influencing factor is ink thickness(ink curing rate).The printing color group as far as possible to the front of the printing station,so that the target color to receive multiple UV light irradiation,strengthen the curing,as well as the original ink in the appropriate amount of photo sensitizer,to accelerate the ink curing are effective methods.