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IMAGE
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Chemjet
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Preparation for the coil coatings Trial
 
  • Mixing of the Paint.
    • General appearance of the paint, NO settling and NO separation NO Foaming, NO floatation. 
    • Check temperature of the shop floor.
    • Mix the paint in barrel for 15-20 minutes by slow speed sterrer.
    • Check settling.
    • Continiue mixing for 15 minutes
    • Check temperature of paint.
    • Check viscosity.
    • Adjust viscosity if required by adding the thinner.
    • Install cleaned pump.
    • Attach filter bag to the feading pipe.

  • Paint flow
    • Maintain regular paint flow.
    • Paint should be in good flow from barrel to Paint Tray and from Tray to Barrel back.
    • Check for the Foam generation and avoid foam to transfer to coating rolls.
    • Paint Temperature as mentioned in TC
    • Place the bafflel so that the return paint does not get picked up any contamination or foam.
  • PMT and OVEN TEMPRATURE SETTING
    •    Zone-wise oven setting.
    •    Maintain the temprature profile record.
    •   PMT strips  Should be avelable during trial.
  • Roller Setting
    • Check the roll setting Applicator, Pick-up  roll stting
    • Be aware of that the roller setting & Pressure coating & paint application can be affected  effected by wrong setting.  Also the final finish of below mentioned properties may differ.
      • Temperature
      • Gloss
      • Stains
      • Scratches
  • Paint Application in lab
    • Check all the properties in Lab by applying the paints in Lab.
    • Check the Curing by PMT check.
    • Curing & Paint adhesion by Solvent rub MEK test
    •  Pencill hardness
    • Scraatch test as per customer.
  • General Test to be conducted in LAB.
    These test are require for all Primer/ Topcoat & Back Coat.

Test results

CUSTOMER SPECIFICATIONS

LAB RESULTS

General appearance

 

 

D.FT.

 

 

Gloss

 

 

Cure(solvent rubs)

 

 

Reverse Impact Flexibility

 

 

Reverse Impact Adhesion

 

 

Distension

 

 

Pencil Hardness

 

 

T-Bend Flexibility

 

 

T-Bend Adhesion

 

 

Colour std. ref.

 

 

T/C

 

 

B/C

 

 

Other    
Remarks:  
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GENERAL INFO
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spacer Why is Coil Coatings required
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spacer What is paint
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spacer Preparation for Coil Coatings Trial
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spacer Lab Testing, Analysis, Principles
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  Coil Coating Process Diagram
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spacer RAL Colour Chart
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