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Powder Coatings Glossary

    (chemical or mechanical) cleaning and passivation of the substrate
    A container that has a fluidizing membrane at the bottom, through which the fluidizing air can flow into the container or powder
edge structure
    Accumulation of powder on the outer edges of the workpieces
inter-coat adhesion
    Adhesion between two coating layers in a multilayer structure
transport adhesion
    Adhesion of the powder to the substrate before curing
purge air
    Airusedtocleanthe electrode in flat spray nozzles and the baffle plate in baffle-plate nozzles
separating agents
    An agent used in the production of injection-molded parts to prevent sticking in the mold
spray pre-treatment
    Chemical pre-treatment in which the chemicals are applied byspraying
dip pre-treatment
    Chemical pre-treatment method in which the parts are immersed in a bath filled with chemicals
color change
    Clean ing of the entire coat ing plant to allow subsequent coating with a different color
color standard
    Color shade as standardized by institutions (ral, ncs, pantone, etc.)
powder center
    Component of the fresh-powder feeding system, which includes the powder/fluid container and the injectors
    Curing of the workpiece in the furnace at an excessively high temperature or for an excessively long retention time
welding point
    Defect visible thro ugh the paint film due to welding of the substrate
    Deformable plastic or coating that becomes soft again at high temperatures
adhesive strength
    Describes the adherence of one material to another; during coating, the adhesion of the powder coating to the substrate
resistance to ground
    Describes the measured resistance between the workpiece surface and the ground connection
penetration behavior
    Describes the penetration of the coating powder into inneredges, cavities and recesses duringthe coating process
color deviation
    Difference in shade between sample and component or between different components
formation of droplets
    Duringmelting, the powder coating runs of ft he edges of the workpiece in the form of droplets
metallic pigments
    Effect pigments added to the powder coating to achieve special surface characteristics: mica, chrome effects, etc.
faraday cage
    Electrostatic phenomenon that makes coating in cavities and inneredges difficult
  1. Elongated irregularities in the coatingthickness or the effect appearance of metallic powder coatings

  2. ( ...
overs pray
    Excess powder paintthat is sprayed but did not adhere to the workpiece during the coating process
end filter
    Fine filter for particles that were not separated by the cyclone
    Fine-pored impairment ofthe cured powder coating due to outgassing or overcharge effects
    Frame, rod or rail for suspension of the workpiecesto be processed
adhesion water dryer
    Furnace for drying of the workpieces after pre-treatment
powder hose
    Hose through which the powder-air mixture is transported from the injector to the coating pistol
solvent resistance
    Imperviousness of the cured powder coating to changes caused by applied solvents
susceptibility to scratches
    Inability of the powder coating to withstand friction orscratches
    Inclusion of visible, non-meltable dirt particles in the powder coating
grain distribution/grain spectrum
    Indicates the ratio between the sizes of the individual powdergrains
cloud formation
    Local cloud-i ike irregularities in the effect formation in metallic powder coatings
coating thickness/density
    Measurablethicknessofthe coating on the substrate
gray film
    Optically visible decomposition products or deposits onthe cured powder coating film, which can be wiped away
    Perceived color due to incident light with different wavelengths
    Plastic or coating that cannot be deformed again after cross-linking, even at high temperatures
deaeration additive
    Powder additive used to avoid blisters orsimilaron exhal at ing substrates
powder puffs
    Powder lumps on the coating layer, caused by deposits that have come loose from the spray nozzle
tribolelectric charging
    Powder particles are positively charged by friction on teflon (ptfe)
oversize particles
    Powder particles that are larger than the desired grain spectrum and are screened out
residual powder
    Powder residues from recycling, prolonged storage, etc. that are no longer usable forthe coating process
powder circuit
    Powder that is not deposited on the workpiece is collected and conveyed back into the powder container to be resprayed
metallic effects
    Powdercoatings with added metallic pigments
downward trickling
    Powdertrickles/falls in small quantities from the workpiece; no laminar detachment occurs
sine wave pattern
    Pre-configured movement of the coating pistols over the component in accordance with the conveyor speed, pistol spacingand stroke speed
fine fraction
    Proportion of fine powdergrains (<10um) in the powder coating
oven graph
    Recordingof the temperature curve in the furnace
dw rinsing
    Rinsing with demineralized water (conductivity max. 20 us/cm) during pre-treatment
fresh water rinsing
    Rinsingcycle with fresh tap waterto remove chemical residues during pre-treatment
    Rounding of cut edges with a minimum radius of 2 mm
oxide layer
    Sealed corrosion layer on a metallic substrate
    Sealed elevation in the powder coating film caused by outgassing
    See anodizing
  1. See powder puffs

powder puffs;
    Slurries produced by the etching process
    Solid lumps of powder, which may be caused by pressure, temperature or vibration
sweep balasting
    Special, gentle blasting process for galvanized substrates
buchholz hardness
    Standardized test method for measuring surface hardness in accordance with din en iso 2815
high-voltage blowback
    Star-shaped defects in the uncured powder coating due to a lack of grounding
    Supplyairinthe injector for regulation andhomog-enization of the powder feeding in the powder hose; this is regulated automatically in plants with total air control
    Supplyairinthe injector that is used to regulate the powder quantity; in plants with total air control it is regulated automatically depend ing on the set powder quantity
conveyor/conveyor chain
    System that moves the component or the suspension trolley through the coatingsystem
screen/screening machine
    System used to sieve the powder coating; also possible with ultrasound
glass transition point (tg)
    Temperature range in which the powder begins to soften
object temperature
    Temperature that the component must reach in the furnace to ensure proper curing; the retention time starts when this temperature is reached
    The powder is brought into a "liquid/suspended" state by means of compressed air
    The time in which the workpiece is heated in the furnace from the ambienttemperaturetothe required object temperature
material thickness
    Thickness ofthe substrate to be coated
filiform corrosion
    Thread-like corrosion ofaluminum; especially prevalent on damaged areasofthe coated surface or cut edges in the presence of air with a high salt content
powder feeding
    Transport of the powder from the container to the pistol or from the recycling system back into the container
reversal point
    Turning point of automatic pistols duringtheupand down movement
surface impairment
    Visible defects inthe powder coating
sanded area
    Visible impairment of the paint film due to mechanical pre-treatment of the substrate, e.g. sanding
picture frame effect
    Visible surface deviation (gloss, flow, structure formation) around the edges of a component
orange peel skin
    Visible, wave-shaped interference pattern on the coated surface