Identification of enameling defects

Identifying the correct type of enamel defect is the first & perhaps most important step when troubleshooting industrial enameling processes.

Analyzing enameling defects with a digital microscoop.
Analyzing enameling defects with digital microscoop

For this purpose we have invested in a digital microscoop and associated software.

Below some images of common enameling defects.

Little copperheads inside water heater
Large copperhead inside water heater

Second hand enameling furnace

One of our relations would like to sell off their gas fired enameling furnace, brand Emisan.

The main characteristics of this furnace read as follows :

Hotzone length : 12,6 m

Maximum production : 1400 kg gr/hr

Firing cube : 730 x 700 x 760 mm

Installed energy : 600,000 kCal/h

Radiant tubes : 10

Temperature zones : 4

Gas fired Emisan enameling furnace

Please feel free to contact us, if you need any further information and/or assistance.

Smart Industry opens a world of possibilities

The world is in anticipation of a fourth industrial revolution.

This revolution is driven by giant leaps in ICT innovation and promises to radically alter the face of industry in the coming decades.

Smart industry

Automated production systems using advanced robotics increasingly communicate with each other on detailed aspects of production, joining up hitherto fragmented manufacturing processes.

By linking all steps in the value chain, a world of possibilities opens for companies, old and new.

See https://smartindustry.nl/english/ for more info about this topic.

 

Enamel slip properties

The consistent liquid enamel slip properties is a critical parameter at any automated wet application process.

Unfortunately enamel rheology is known to change easily under the influence of particle size, specific weight, temperature, milling additives and/or pretreatment chemicals.

Failure to maintain its properties within measurable tolerances, may result in inconsistent enamel layer thickness and eventually even enamel defects.

Do you really believe that you can “feel it” with your fingers as demonstrated on the picture below, or do you rather prefer a more precise testing method ?!

Measuring enamel slip characteristics by hand
Old fashion way

Rotational Viscometer with temperature sensor
Rotational Viscometer with temperature sensor

Fishscaling of porcelain/vitreous enamel coatings

Fishscaling

Fishscaling is an enameling defect, which is characterized by small enamel particles chipping off.

Chipping off may happen directly after firing when cooling down or sometimes even days later.

example of enamel defect called fishscaling

Effected products may usually not be repaired. Due to this reason, this defect is still one of the most described topics within the international enameling industry.
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