Hanna Technology offers after-sales: Analysis of common problems in electrostatic spraying process

One Shrink hole and pinhole
 

• Serious pollution;
• The leveling agent is not added or insufficient;
• Uneven dispersion;
• There are incompatible materials
• The benzoin is not added;
• Mechanical equipment cleaning is not clean;
• The molecular weight of the resin is not too broad;
• The material has too much water or small molecules;
• Some additives are not purely affected;
• Other factors
   
  Two particles
   
• There are gelatinized particles during extrusion, and there is a solidified substance in the screw cavity;
• Raw materials have impurities;
• The spray is too thin;
• The substrate has particles or fibers;
• Spraying factors
   
  Three surface and flow adjustment
   
• Low resin content or high viscosity;
• The baking temperature is too low to flow easily, or the curing process is segmented;
• The powder leveling time is too short;
• The film thickness is too thick (large ripple) or too thin (small ripple);
• The pigment filling capacity is large;
• Some additives affect;
• Miserable goods:
• The cleaning machine material is not completely discarded;
• Infused with raw material in the flakes; incompatible interference (other powders mixed in)
   
  Four surfaces have a smooth mirror effect and are not strong
   
• The curing agent is not called or less than;
• The reactant ratio is wrong;
• Human factors
   
  Five performance shocks fail
   
• The main material resin or curing agent problem;
• The curing conditions are not reached;
• Other additives;
• Mismatched materials
   
  Six texture is not strong
   
• System viscosity problem;
• The impact of the reaction process;
• The additive is not pure, the problem of the thickness of the floating agent
   
  Seven multi-color powder and silver powder can not be dispersed
   
• There is a problem with the bottom powder;
• The silver powder is not dispersed;
• Suggested to add FLOWING1010
• Differences in chargeability of different components;
• The particle size is coarse and uneven, or the difference between the powder and the powder is large.
   
  Eight color changes are larger
   
• The pigment is not resistant to temperature and the fluctuation of the pigment;
• Changes in baking conditions;
• Formulation design changes impact;
• Other human factors, wrong ingredients
   
  Nine workpieces are powdered at a time, and the powder on the dead corner of the workpiece is poor.
   
• The powder is weakly charged (the charge-to-mass ratio is small), such as: the powder is too thick or too fine, the powder resistivity and the like;
• The amount of resin is too small, too much pigment and filler;
• The air pressure is improper and the spray gun is aging;
• improper adjustment of powder charge
• It is recommended to increase the powder by using FLOWING1010 to increase the area of ​​1-3 square meters.
   
  Ten summer powder easy to pack unity block
   
• The raw material resin has different glass transition temperatures and viscosities.
• The summer temperature is too high, the powder storage temperature does not exceed 35 ° C
• Extrusion temperature is too high, the mill friction is overheated, there is no cooling device