LHB COACH PAINTING.PPT

lhb coach painting

1. LHB PAINTING

2. WHAT IS A PAINT…
Physically,paintisamixtureoffour
importantelements:
Pigments,Additives,Bindersand
Solvents.
Pigmentsrendercolorandopacityto
thepaint.
Additivesendow the paint with special
properties such as resistance to fungus,
rust etc.

3. WHAT IS A PAINT…
Binders:holdthepainttogether
andalsobindittothesurfacebeing
painted,thuspromotingdurability.
Solvents:-giveapaintitsflowing
property,enablingbrushing/rolling
onasurface.

4. PURPOSE OF PAINTING…
Differentpaintshavespecific
propertiesthatprevent,oratleast
delaytherustingandcorrosionby
formingaprotectivelayeraround
thesubstrate.
Differentcolourschemesprovide
astheticlooktomaterials.

5. PAINTING SYSTEM IN INDIAN
RAILWAYS…
Alkyd-Alkyd-Alkyd system
(Earlier Followed in ICF).
Epoxy-Epoxy-Alkyd system
(Earlier in RCF for ICF type coaches)
Epoxy-Epoxy-Polyurethane system
(Earlier in RCF for ICF type coaches)
Epoxy-Polyester-Polyurethane
system
(In RCF for ICF & LHB coaches)

6. WHY PU PAINTING…
Alkyd painting system is:
Less durable.
Low Gloss & Colour retention.
Less resistance to salty atmosphere.
Less resistance to ultra-violet rays.
Require frequent re-painting.
Increases effective cost of painting.

7. LHB PAINTING PROCEDURE…
(Epoxy-Polyester-Polyurethane system)
1.Surface Preparation.
2.Primer Application.
3.Putty Application on joints.
4.First & Second Coat Putty application.
5.Putty Rub-down.
6.Fine Putty Application.
7.Fine Putty Rub-down.
8.PU Primer Application.