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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
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