How to make better use of PUR hot melt.

PUR hot melt (Polyurethane Reactive) as a new single-component, solvent-free hot melt structure glue, its air cured by moisture, fully cured with excellent bonding strength and impact resistance, but also has excellent bonding strength, temperature resistance, chemical corrosion resistance and aging characteristics, in recent years has become the mobile phone and other electronics industry bonding the best adhesive.
How to more effectively improve the quality and efficiency of the operation of the glue has become the focus of attention, in general, we believe that by the following three points:
high-performance structural adhesives
non-corrosive, high bonding strength
high initial adhesion, fast curing speed, to meet high-paced production
excellent aging resistance, weather resistance, excellent water resistance, Solvent resistance, reliable adhesion
eelective adhesive equipment
computer programming, precise positioning, travel control
glue line control, prevent spillage, reduce the bad rate
sopen process
mature process, experienced personnel, effective management system
can complete high-quality, high-efficiency production
we from the glue aspect. Factors and solutions that affect the process of the product during the dosing process:
1, the chemical composition of pur hot melt adhesive affects
the degree of certain chemical composition of PUR hot melt directly affects the viscosity

. From the point of view of product performance, we are committed to pur hot melt performance improvements (e.g. viscosity, melt temperature, melt viscosity, initial viscosity, etc.), so choosing the right glue is a good start.
2, different bonding materials affect the
. PUR hot melt for different substrates, such as rubber, plastic, glass, metal, leather, wood, fabrics, etc. have good bonding capacity, for different bonding materials, choose the right model of glue.
3, the amount of glue applied to
. Pur glue coating volume, will affect the curing time, if the coating layer is thin, then curing time is short. In the event of a large amount of glue, the moisture content as a curing glue will be relatively inadequate, the curing time will be longer, and will eventually affect the bonding strength of the structural parts.4, dosing opening hours
points on the sample PUR hot melt exposure time in the air must be controlled within 1min (from dosing to assembly). In an effective opening time, complete bonding, to avoid due to the opening time is too long, the glue line appears table dry phenomenon, resulting in poor immersion effect of the glue line, thus affecting the strength of bonding.
5, press the
. The structural parts of the PUR hot melt must be pressed after assembly for a period of not less than 15 seconds and at a pressure of not less than 3 kg. The aim is to make the glue form a good adhesive thickness and the immersion effect of the glue between the two bonding surfaces.
6, ambient temperature and humidity
. PUR hot melt is in the air by moisture curing, ambient humidity, curing time is short, on the other way, long time, high ambient temperature, conducive to moisture participation in the reaction, curing time will be shortened accordingly.
7, bond surface treatment
due to the presence of oxide layer rust, chrome coating, phosphating layer and other boundary layer, the surface treatment of the viscous will affect the bonding strength. The removal of oil, dust, paint, release agent, oxidation layer and other substances affecting bonding on the surface of the bonded site is conducive to enhancing the effect of PUR hot melt bonding.
.