How to better use PUR hot melt adhesive?
PUR hot melt adhesive (PolyurethaneReactive) is a new type of one-component, additive-free hot melt weathering adhesive. It is cured by moisture in the air and has excellent bonding strength and impact resistance after thorough curing. At the same time, it has excellent bonding compressive strength, heat resistance, solvent corrosion resistance and temperature resistance. In recent years, it has become a relatively good bonding adhesive for electronic products and electronic industry.
PUR hot melt adhesive(PolyurethaneReactive) As a new type of one-component, additive-free hot-melt weather-resistant adhesive, which is cured by moisture in the air, has excellent bonding strength and impact resistance after thorough curing, and has excellent bonding compressive strength, heat resistance, solvent corrosion resistance and temperature resistance. In recent years, it has become a better adhesive for electronic products and electronics industry.
How to improve the quality and efficiency of dispensing operation more efficiently has become the focus of attention. Generally speaking, for us, it is determined by three points:
1. Good performance. No corrosion, high bonding strength, high initial adhesion, faster curing speed, high beat production and manufacturing excellent anti-aging, anti-aging performance, excellent water resistance, solvent resistance, reliable adhesion
2. Full-automatic dispensing machine equipment programming, accurate positioning, stroke arrangement controllable line skin controllability, avoid glue leakage, reduce the unqualified rate
3. Complete production process, perfect processing technology, senior staff, reasonable management plan can complete high quality and more efficient production and manufacturing
We can look at it from the glue side. Factors and solutions that affect the manufacturing of goods when dispensing glue:
1. The composition hazard of PUR hot melt adhesive
PUR hot melt adhesive some ingredients more and less directly affect the viscosity of PUR. We can consider from the perspective of product characteristics, focus on PUR hot melt adhesive performance improvement (such as viscosity, melting temperature, melting viscosity, initial adhesion, etc.), so choose a suitable glue, is better gradually.
2. Hazards of different bonding materials
PUR hot melt adhesive has a good bonding level for different plates, such as plastic, plastic, laminated glass, metal materials, leather products, wood, textiles, etc. For different bonding raw materials, choose the appropriate adhesive type and specification.
3, the amount of glue more and less
The amount of PUR adhesive applied will affect the curing time. If the dispensing layer is thin, the curing time will be shorter. The amount of glue applied is much in the place. As a curing glue, the amount of glue is relatively incomplete, the curing time can be very long, and it will also affect the bonding compressive strength of the parts.
4. Opening time of dispensing
The possible duration of PUR hot melt adhesive spotted in the sample in the air must be kept within 1min (from dispensing to installation). In the effective opening time, bonding, to avoid because the opening time is long, the thread skin dry solid condition, resulting in poor invasion of the thread skin, thus affecting the bonding strength.
5. Presentation
After PUR hot melt adhesive is installed, the parts must be pressed together for not less than 15 seconds and the working pressure should not be less than 3KG. The purpose is to promote the glue to establish a good adhesive thickness between the two bonding surfaces.
6. Natural environment temperature and humidity
PUR hot melt adhesive to be cured in the air by moisture in the body, the relative humidity of the air, the curing time is short, on the contrary, the time is long, the working temperature is high, which is beneficial to the participation of water, and the curing time can be reduced accordingly.
7. Surface treatment of adhesive
Due to the existence of oxide layer rust, stainless steel layer, phosphating layer and other boundary layers in the adhered material, the surface treatment of the adhered material will affect the bonding compressive strength. Eliminate the oil stains, dust, architectural coatings, film release agent, oxide layer and other factors on the surface of the bonded position, which is beneficial to improve the actual effect of PUR hot melt adhesive bonding.
Related News