First, the adhesives must have a sufficient adhesive strength to ensure that the function of the paper products will not be affected after bonding. The method to determine whether the adhesive sealant bonding strength is qualified is to tear the two sticky material along the adhesive interface, if the sticky material was torn destroyed, the bonding strength is sufficient; bonding interface will be separated if only indicates that insufficient adhesives intensity. Unglued, film crisp phenomenon sometimes poor performance of adhesives in high or low temperature storage for some time, so it is necessary to do a high-temperature thermal change and low temperature embrittlement experiments to determine its quality is reliable. The test method of high-temperature thermal bonding department has completely cured tray put in a 60 degree constant temperature oven baking for 24 hours, and flap the tray junction until their separation after cooling, if they stick material torn, indicating that the heat resistance of the adhesive is excellent, if they are sticky material intact, just bonding interface disengaged, enough that the heat resistance; the embrittlement test methods in the low temperature is to put the tray which has been completely cured at -15℃ to make it frozen for 24 hours in the environment, and the determination method is the same with the test method of high temperature thermal deformation.
The Speed of Drying
When purchasing the adhesives, we must measure whether the drying rate matches with the bonding process. The manual bonding process is slower, which requires a longer initial dry time, while the speed of the machine bonding process is high, with the requirement of short early dry time.
The Viscosity of Adhesive
The viscosity is the most important factor affecting adhesives quality. If the viscosity is in the high value, the coating is thicker, the glue consumption is large, the speed of drying is slow, but also affect the wetting and penetration on the surface of Heat Sink Paste, which in turn directly affect the adhesive strength; if the viscosity is too small, the coating layer is thinner, the excessive drying, which prone to the issues, such as adhesion failure. So the packaging enterprises must make the viscosity testing from time to time, to ensure its adhesion strength in the ideal range.
The Solid Content
The solids content is one of the important factors affecting the quality of the adhesives. The higher the solids content, the stronger adhesive force, the faster the drying speed. The cardboard with the high solid content will be harder. Therefore, in the case of other consistent technical indicators, high solid content is conducive to improve the production efficiency, and to maintain the quality and stability of the paper products.
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