Resolve the quality of pressure sensitive adhesive
The general manual bonder determines the quality of the pressure sensitive adhesive, which can be measured in terms of adhesive strength, drying speed, viscosity, solid content and pH.
1, solid content
Solid content is also one of the important factors affecting the quality of pressure sensitive adhesives. The higher the solid content, the stronger the adhesion and the faster the drying speed.
2, pH value
Synthetic resin adhesives are mostly weakly acidic and do not adversely affect the bonding process. However, water glass and starch adhesives are highly alkaline, and high alkalinity not only causes corrosive effects on workers and equipment, but also corrodes adherends and forms spots that affect appearance. Therefore, the effect of pH on the product should be considered when purchasing the adhesive.
3, bonding strength
Pressure sensitive adhesives must first have sufficient bond strength to ensure proper use of the bonded objects. Judging whether the adhesive strength of the adhesive is acceptable, the two adhesive materials can be torn along the adhesive interface. If the adhesive material is damaged after the tearing is found, the adhesive strength is sufficient; if only the adhesive interface is separated, it indicates Insufficient strength of the adhesive.
4, viscosity
Viscosity is the most important factor affecting the quality of the adhesive. If the viscosity is too large, the coating is thick, the amount of glue is large, and the drying is slowed down, which also affects the wetting and osmosis of the adhesive on the surface of the adherend, thereby directly affecting the bond strength; if the viscosity is too small, The coating is thinner, too dry, and prone to poor adhesion.
5, drying speed
When purchasing pressure sensitive adhesives, it is necessary to measure whether the drying speed matches the bonding process. The general manual bonding process is slower and requires a longer initial drying time; the machine bonding process is fast and requires a short initial drying time. For the thorough time, in most cases, the faster the better, so that you can enter the next process as soon as possible.
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