With over 15 years of experience in this industry, Ashwani Gupta and Alok Gupta have seen MPIL grow in all the dimensions. Today MPIL is amongst the leading manufacturer of steel and heavy structures. Here, we tell you how the blasting and painting process takes place at MPIL.
The bare surfaces are prepared by mechanical abrasion by shot blasting methods for removal of paint and dirt.
SHOT BLASTING – in this, the small metal balls or sharp metal particles are shot on the surface for cleaning purpose or for paint removal of old paint if any. This makes the bare surface rough enough suitable for the painting purposes. As the steel itself is not suitable for adhering paint on it, hence it need to be roughened by this process.
MPIL PAINTING STANDARD PROCEDURE:
|Name||RED OXIDE ZINC PHOSPHATE||EPOXY BASED MIO||SYNTHETIC ENAMEL (long oil alkyd)|
|No of Coats||1||1||2|
|DFT||30 micron||75 micron||20 micron|
1. Before priming the surface is prepared by power tool cleaning.
2. Painting is done at controlled environment only which is free from dust & paint soot.
3. The paint is mixed with hardener and thinner in the ratio as suggested in the TC or technical manual only.
4. Primer paint shall be applied immediately or within 4 hours in the case of shot blast cleaning and within 8 hours for mechanical cleaning.
5. For all machined components, rust preventive fluids shall be applied.
6. Wherever Second coat or Finish coat is to be applied in succession, 24 hours minimum drying time shall be provided between each coat for single pack paints. For two-pack system refer paint supplier’s catalogue.
7. WFT & DFT are calculated using DFT meter.
8. Testing & Inspection is done after every application of the coat of primer & paint to ensure quality painting work.
9. Inspection like Adhesion by Cross hatch test by elcometer, DFT for paint thickness, etc.