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Dip Drain coating process

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DIP DRAIN COATING PROCESS

In the conventional dip drain coating process, the parts to be coated (e.g. window frames, etc.) are immersed in the paint and then removed at a controlled speed.

The dip drain coating process uses both solvent-​based and water-​based dip coatings. The advantage of this process is the high degree of automation and the complete painting of the components with minimal loss of coating material  (i.e. no overspray).

In order to ensure high-​quality and consistently good results, however, some important criteria must be taken into account. First, the component or substrate to be coated must be absolutely clean. Any impurities present would accumulate in the bath and adversely affect the coating process. In order to ensure constant bath quality, both the paint to be applied and evaporated solvent or water must be continuously replenished. Continuous  circulation of the coating material is necessary to prevent sedimentation in the low-​viscosity bath.

In addition to maintenance of the coating material, the size and geometry of the parts are also essential to overall quality with this method. For example, parts should have enough openings from which the paint can drain upon removal from the bath. Paint which is not removed and accumulates within the part (e.g. in corners) will result in quality issues.

Ventilation of the coated component is also necessary to prevent air pockets inside the part which can lead to uncoated areas and subsequent defects.  

The dip-​drain process is influenced by several parameters. The most important are:

  • Immersion time
  • withdrawal speed
  • viscosity
  • Paint and part temperature

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