J&B Powder Coating prides itself with its manual system which we feel provides an advantage to our customers by being totally hands on. This relates to difficult part shapes having 100 percent coverage. Costs are kept to a minimum due to fast color changes and minimal powder waste compared to more intricate production run facilities.
Product quality control checks include but are not limited to random application thickness using testing equipment and procedures complying with current ASTM Standards, visual inspection and off site lab testing for abrasion and impact resistance, salt spray and others are available on request.

J&B Powder Coating offers its service to many customers from the home owner to the manufacturer and the metal fabricator. We have done projects from metal railings to production agricultural equipment. We like to work closely with our customers as we feel that is the only way to provide a finished product that is of the quality the customer demands and we provide that quality from start to finish.

Substrates include all ferrous and non ferrous metals. Pretreatments include in house abrasive blasting, steam degreasing iron phosphate pre-treatment and laser slag removal. Application includes all types of powder finishes from high gloss to wrinkle, high temperature coatings, functional coatings for pipe and rebar, anti-graffiti, metallics, clears, primers and 2 stage.

What is Powder Coating?
Powder coating is a type of dry coating, which is applied as a free-flowing, dry powder. The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form. The coating is typically applied electrostatically and is then cured under heat to allow it to flow and form a "skin." 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 "whiteware", aluminium extrusions, and automobile and motorcycle parts. Newer technologies allow other materials, such as MDF (medium-density fibreboard), to be powder coated using different methods.
Advantages of Powder Coating

There are several advantages of powder coating over conventional liquid coatings:
1.Powder coatings emit zero or near zero volatile organic compounds (VOC).
2.Powder coatings can produce much thicker coatings than conventional liquid coatings without running or sagging.
3.Powder coating overspray can be recycled and thus it is possible to achieve nearly 100% use of the coating.
4.Powder coating production lines produce less hazardous waste than conventional liquid coatings.
5.Capital equipment and operating costs for a powder line are generally less than for conventional liquid lines.
6.Powder coated items generally have fewer appearance differences between horizontally coated surfaces and vertically coated surfaces than liquid coated items.
7.A wide range of specialty effects is easily accomplished which would be impossible to achieve with other coating processes.

Types of Powder Coatings

There are two main categories of powder coatings: Thermosets and thermoplastics. The thermosetting variety incorporates a cross-linker into the formulation. When the powder is baked, it reacts with other chemical groups in the powder polymer and increases the molecular weight and improves the performance properties. The thermoplastic variety does not undergo any additional reactions during the baking process, but rather only flows out into the final coating.
The most common polymers used are polyester, polyester-epoxy (known as hybrid), straight epoxy (Fusion bonded epoxy) and acrylics.

Production:

1.The polymer granules are mixed with hardener, pigments and other powder ingredients in a mixer
2.The mixture is heated in an extruder
3.The extruded mixture is rolled flat, cooled and broken into small chips
4.The chips are milled to make a fine powder

The Powder Coating Process

The powder coating process involves three basic steps:

1.Part preparation or the Pre treatment
2.The powder application
3.Curing

1.Part Preparation Processes & Equipment

Removal of oil, soil, lubrication greases, metal oxides, welding scales etc. is essential prior to the powder coating process. It can be done by a variety of chemical and mechanical methods. The selection of the method depends on the size and the material of the part to be powder coated, the type of soil to be removed and the performance requirement of the finished product.

Chemical pre-treatments involve the use of phosphates or chromates in submersion or spray application. These often occur in multiple stages and consist of degreasing, etching, de-smutting, various rinses and the final phosphating or chromating of the substrate. The pre-treatment process both cleans and improves bonding of the powder to the metal. Recent additional processes have been developed that avoid the use of chromates as these can be toxic to the environment such as Titanium Zirconium and Silanes which offers similar performance against corrosion and adhesion of the powder.

Another method of preparing the surface prior to coating is known as abrasive blasting or Sandblasting and shot blasting. Blast media and blasting abrasives are used to provide surface texturing and preparation, etching, finishing, and degreasing for products made of wood, plastic, or glass. The most important properties to consider are chemical composition and density; particle shape and size; and impact resistance.

Silicon carbide grit blast media is brittle, sharp, and suitable for grinding metals and low-tensile strength, non-metallic materials. Plastic media blast equipment uses plastic abrasives that are sensitive to substrates such as aluminum, but still suitable for de-coating and surface finishing. Sand blast media uses high-purity crystals that have low-metal content. Glass bead blast media contains glass beads of various sizes.

Cast steel shot or steel grit is used to clean and prepare the surface before coating. Shot blasting recycles the media and is environmentally friendly. This method of preparation is highly efficient on steel parts such as I-beams, angles, pipes, tubes and large fabricated pieces.

Different powder coating applications can require alternative methods of preparation such as abrasive blasting prior to coating. The online consumer market typically offers media blasting services coupled with their coating services at additional costs.

2.Powder Application Processes

The most common way of applying the powder coating to metal objects is to spray the powder using an electrostatic gun, or Corona gun. The gun imparts a positive electric charge on the powder, which is then sprayed towards the grounded object by mechanical or compressed air spraying and then accelerated toward the workpiece by the powerful electrostatic charge. There are a wide variety of spay nozzles available for use in electrostatic coating. the type of nozzle used will depend on the shape of the workpeice to be painted and the consistency of the paint. The object is then heated, and the powder melts into a uniform film, and is then cooled to form a hard coating. It is also common to heat the metal first and spray the powder onto the hot substrate. Preheating can help to achieve a more uniform finish but can also create other problems, such as runs caused by excess powder. See the article "Fusion Bonded Epoxy Coatings"

Another type of gun is called a Tribo gun, which charges the powder by (triboelectric) friction. In this case, the powder picks up a positive charge while rubbing along the wall of a Teflon tube inside the barrel of the gun. These charged powder particles then adhere to the grounded substrate. Using a Tribo gun requires a different formulation of powder than the more common Corona guns. Tribo guns are not subject to some of the problems associated with Corona guns, however, such as back ionization and the Faraday Cage Effect.

Powder can also be applied using specifically adapted electrostatic discs.

Another method of applying powder coating, called the Fluidized Bed method, is by heating the substrate and then dipping it into an aerated, powder-filled bed. The powder sticks and melts to the hot object. Further heating is usually required to finish curing the coating. This method is generally used when the desired thickness of coating is to exceed 300 micrometres. This is how most dishwasher racks are coated.

Electrostatic Fluidized Bed Coating: Electrostatic fluidized bed application uses the same fluidizing technique and the conventional fluidized bed dip process but with much less powder depth in the bed. An electrostatic charging media is placed inside the bed so that the powder material becomes charged as the fluidizing air lifts it up. Charged particles of powder move upward and form a cloud of charged powder above the fluid bed. When a grounded part is passed through the charged cloud the particles will be attracted to its surface. The parts are not preheated as they are for the conventional fluidized bed dip process.

Electrostatic magnetic Brush (EMB) Coating: an innovative coating method for flat materials that applies powder coating with roller technique, enabling relative high speeds and a very accurate layer thickness between 5 and 100 micrometre. The base for this process is conventional copier technology. Currently in use in some high-tech coating applications and very promising for commercial powder coating on flat substrates (steel, Aluminium, MDF, paper, board) as well in sheet to sheet and/or roll to roll processes. This process can potentially be integrated in any existing coating line.

3.Curing

When a thermoset powder is exposed to elevated temperature, it begins to melt, flows out, and then chemically reacts to form a higher molecular weight polymer in a network-like structure. This cure process, called crosslinking, requires a certain degree of temperature for a certain length of time in order to reach full cure and establish the full film properties for which the material was designed. Normally the powders cure at 200°C (390°F) in 10 minutes. The curing schedule could vary according to the manufacturer's specifications.

The application of energy to the product to be cured can be accomplished by convection cure ovens or infrared cure ovens.