Automatic Dip Coating

The parts to be coated are moved slowly with an automatic conveyor (Fig. 71). Here the parts must be recovered very slowly (10 to 50 cm/min) in order to get an even coating. The adhesive may be more viscous 100 to 2000 mPas. The thicker the adhesive, the slower should be the recovery. 

Drip marks may be avoided because the recovery speed may be slower than the dripping of the adhesive. 

Primer tank 2. Agitation 3. Oven for primer drying 4. Second tank for adhesive dipping 5. Oven for adhesive drying 

The add-on may be from 40 to 200 g/m according to the viscosity and rheology for instance 40 g/m for a solvent-based adhesive with a viscosity of 500 mPas and 200 g/m with 3000 mPas. 

It is also possible to coat a large number of small parts by placing it onto a grill, which is then dipped into the adhesive tank. Some examples of applications of this technique are  

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