Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint which is delivered via an evaporating solvent, powder coating is typically applied
electrostatically and then cured under heat or with ultraviolet light. The powder may be a thermoplastic or a thermoset polymer. It is usually used to create a hard finish that is tougher than conventional
paint. Powder coating is mainly used for coating of metals, such as household appliances, aluminium extrusions, drum hardware, automobiles, and bicycle frames. Advancements in powder coating technology like
UV curable powder coatings allow for other materials such as plastics, composites, carbon fiber, and MDF (medium-density fibreboard) to be powder coated due to the minimum heat and oven dwell time required
to process these components. Powder coatings contain no solvents and release little or no amount of volatile organic compounds (VOC) into the atmosphere. Thus, there is no need for finishers to buy costly
pollution control equipment. Companies can comply more easily and economically with environmental regulations, such as those issued by the U.S. Environmental Protection Agency. Powder coatings can produce
much thicker coatings than conventional liquid coatings without running or sagging. Powder coated items generally have fewer appearance differences than liquid coated items between horizontally coated
surfaces and vertically coated surfaces. A wide range of speciality effects are easily accomplished using powder coatings that would be impossible to achieve with other coating processes. Curing time is
significantly faster with powder coatings compared to liquid coatings especially when using ultraviolet cured powder Coatings or advanced low bake thermosetting powders.
method: it is the most commonly used spraying method for powder automatic spraying equipment, mainly through the electrostatic field to make the electrostatic powder coating evenly fall on the surface of the
workpiece to be sprayed, A uniform coating is then formed by leveling in a curing oven; 2. Electrostatic fluidized bed spraying method: The electrostatic fluidized bed spraying method is mainly by adding
high-voltage electrodes to the interval of the porous plate at the bottom of the powder automatic spraying equipment and the container. Thus, a high-voltage electric field is formed between the piezo
electrode and the workpiece, and the uniformity and adhesion of the coating thickness of the powder coating are greatly improved; 3. Electrostatic oscillating powder coating method: The electrostatic
oscillating powder coating method used in powder coatng machine mainly converts the high-voltage point of direct current into a high-
voltage electrostatic field, so that its periodic change produces electric field oscillation. And under the action of this oscillating electrostatic field, the powder coating will float.
Electrostatic powder coating gun is mainly composed of powder supply barrel, powder spray gun and controller. It is a special spray gun for
electrostatic spraying of paints and powder coatings. It is both a paint atomizer and an electrostatic electrode generator. The powder needs to be charged to the workpiece to form an effective coating to
protect and decorate the workpiece. Usually, a powder spray gun that can generate high-voltage static electricity is used as a production tool for powder coating. Such a type of spray gun will generate a
high-voltage, low-current high-voltage electric field, and the powder particles will be negatively charged when they move in it, and then firmly adsorbed onto the workpiece to be coated. Such a process is
often referred to as powder electrostatic spraying.
In electrostatic powder coating, the curing furnace is the key equipment. The quality of the paint film has a very important relationship with the temperature of the curing furnace. The heating method of
the powder curing furnace can be divided into two categories: one is the hot air circulation type, The second type is the infrared radiation heating method. Hot air circulation heating can be divided into
direct heating and indirect heating. There are two heat sources used for direct heating, electric heating spiral fin type and gas type direct heating. The advantages of the direct electric heating spiral fin
type are uniform temperature in the furnace and strong adaptability of the workpiece: the solid state relay PID is used to adjust the temperature. The temperature deviation in the
powder coating oven is small. The disadvantage is that the heating time is slow and the equipment power is large, and it is not fit for used
to cause secondary pollution of dust. The furnace occupies a large area. The advantages of the gas-fired direct heating method are fast heating speed, high heat energy conversion rate, proportional
adjustment control for furnace temperature control, and small temperature control deviation in the warm furnace. Because the burner flame burns directly in the combustion chamber, the curing process is
likely to cause secondary pollution of dust and exhaust gas, which is not suitable for use as a home powder coating oven
. A high temperature resistant filter should be installed in the heating chamber, so that the full pressure of the circulating fan should be considered in the selection of the fan. In addition, the
heating indoor plate must be made of stainless steel plate, the cost of these two equipment is relatively Increase, the furnace covers a large area.
Powder coating filter is a kind of multi-purpose filter equipment with novel structure, small size, simple
and flexible operation, energy saving, high efficiency, airtight work and strong adaptability. It is a pressure filter device. The liquid flows into the filter bag from the inlet pipe on the side of the
filter shell. The filter bag itself is installed in the reinforcement net. The liquid penetrates the filter bag of the required fineness grade to obtain qualified filtrate. Impurity particles are captured by
filter bags. The machine is very convenient to replace the filter bag, and there is basically no material consumption for filtration. This filter can be applied to 1. Nanofiltration (NF), ultrafiltration
(UF), reverse osmosis (RO), electronic membrane deionization (giant D,) and other system security filtration; 2. Filtration of pharmaceutical injections, large infusions, eye drops, Chinese herbal medicines,
etc., extraction, purification and concentration of biological preparations; 3. Pre-filtration of high-purity water for electronics, microelectronics, and semiconductor industries; 4. Filtration of oilfield
re-injection water, boiler feed water, chemical reagents, liquid organic products, high-purity chemicals, concentrated drugs, etc.; 5. Drinking purified water, mineral water, fruit juice, tea drinks, health
drink filtration, etc.
The main recovery methods of powder coating include filter element recovery and combination of large cyclone and small cyclone. Improvements to the [url=http://www.powdercoatmachine.com/powder-coating-
accessories/powder-coating-recovery-powder-sieve-system/]powder coating recovery powder sieve system[/url] allow for a more efficient, cleaner coating. 1. Filter element detection and cleaning device powder
recovery; 2. The frequency conversion recovery system maintains a stable air flow for powder recovery, which means a stable recovery effect. However, under the same recycling capacity, different workpieces
have different powder adhesion efficiencies. Coupled with the guiding effect of some large workpieces and long workpieces, powder spillage will also occur. The selection of variable frequency fans can adjust
the recovery air volume within a certain range, which not only meets the requirements of noise reduction, but also meets the requirements of recovery capacity. The frequency conversion recovery system can
increase or decrease the air volume according to the recovery effect, so that the powder coating production has a certain mobility. When the production volume is small or the amount of powder spraying is
small, the air volume of the fan can be reduced, which has a certain energy saving effect.
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