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Particle Size Distribution
FINE PARTICLES Lower film builds Can blind cartridges and filters Migrate from part into exhaust Reduced fluidization properties Smoother films Absorb moisture more readily COARSER PARTICLES Higher film builds Increased Faraday penetration Increased fluidizaion properties
Powder Coatings Manufacturing
Weigh-up and Mixing ( raw material,such as resins,hardener,pigments,filler,etc) Extrusion Process Milling and Sieving
Phosphating conversion coatings
The recognized pre-treatment for steel substrates just prior to application of powder coatings is phosphating which can vary in coating weight. The greater the conversion coating weight the greater the degree of corrosion resistance achieved; the lower the coating weight the better the mechanical properties. It is therefore necessary to select a compromise between mechanical properties and corrosion resistance. High phosphate coating weights can give trouble with powder coatings in that crystal fracture can occur when the coating is subjected to locallyRead More …
Various Substrates for Powder Coating
Substrates Aluminium,steel,zinc alloys,copper and galvanized steel are common metals on which powder coatings are applied. In a number of cases where normal service conditions apply, satisfactory properties can be obtained on thoroughly cleaned metal. Aluminium For aluminium and its alloys,performance can be upgraded using a proprietary chromate conversion coating, even though the clean surfaces are easily coated and adhesion is excellent Steel For iron/steel surfaces maximum corrosion and salt spray resistance are given by a zinc phosphate conversion coating. Zinc alloys With allRead More …
Main aims in the pretreatment to metal surface before coating
The main aims in the preparation of a metal surface before powder coating may be defined as follows: The conditioning of the surface so as to render it suitable for the coating that is to be applied The complete removal of all foreign matte,e.g,scale,grease,cutting oil,soil,welding splatter,etc The pretreatment should impart uniformity throughout all treated workpiece surfaces,irrespective of the source of the metal or of the contaminants that might adhere. As with other methods of organic finishing attention to the pretreatment stage isRead More …
Loss of Mechanical and Chemical Properties
1.Poor Mechanical Properties and Chemical Resistance Cause: Too high or Too low curing temperature or time Solution: Confirm and check with powder coating supplier Cause:Oil,grease,extrusion oils,dust on the surface Solution:Optimize pretreatment Cause:Differing materials and material colors Solution:Insufficient pretreatment Cause:Incompatible pretreatment and powder coating Solution:Adjust pretreatment method,consult powder supplier 2.Greasy Surface(Haze like film on the surface which can be wiped off) Cause: Blooming effect-white film on the powder surface,which can be wiped off Solution:Change powder coating formula,increase curing temperature Cause: Insufficient airRead More …
Electrostatic fluidized Bed Coatings
Electrostatic fluidized beds are especially applicable to continuous coating of sheets,wire screen and small simple configuration parts.The effective coating range is only 3-4inches over the bed and will not coat parts with deep recesses.Coatings range from 20-74um on relatively high speed lines. Advantages include: High speed lines ; Easily automated; Acceptable to continuous length products Disadvantages include: Coating area limited to 3-4inches above bed; Restricted product flexibility; Best for 2 dimensional parts Links to: Fluidized Bed Powder Coating Electrostatic(Corona)Spray Triboelectric/Tribostatic Spray
D5 Creation