With the rapid development of smartphones and rapid changes in market demand, smartphone screens are getting bigger and bigger, the bezels are getting narrower, and the requirements for reliability are getting higher and higher. International smartphone manufacturers have turned to reactive hot melts. Glue (PUR) solution. Reactive hot melt adhesive (PUR) combines the characteristics of fast curing and ultra-high strength, can adapt to the rhythm of efficient automated production, and can provide very high strength in a limited area, improving the overall impact resistance, sealing and reliability.