Powder coating apparatus and method of powder coating using an electromagnetic brush

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush for applying the powder coating material to the substrate including the substrate portion from the reservoir;
• and
• an electric field between the magnetic brush having a rotating magnetic field and the substrate wherein the powder coating material is prepared from a process for modifying a powder paint by recompounding electrostatic spray powder paint at low temperature to incorporate addenda, regrinding, or surface treating while not substantially increasing viscosity.

A method for applying powder coatings to a substrate comprising:

• providing powder-coating material in a reservoir;
• supplying an electric field between a magnetic brush having a rotating magnetic field and the substrate;
• and
• applying the powder coating material to the substrate, situated in the electric field, from the reservoir using the magnetic brush.

A method for applying powder coatings to a substrate comprising:

• providing powder-coating material in a reservoir;
• supplying an electric field between a magnetic brush having a rotating magnetic field and the substrate;
• and
• applying a first powder coating material to the substrate, situated in the electric field, from the reservoir using the magnetic brush;
• applying a second powder coating proximate the first powder coating.

A method for applying powder coatings to a substrate comprising:

• providing powder-coating material in a reservoir;
• supplying an electric field between a magnetic brush having a rotating magnetic field and the substrate;
• and
• applying a first powder coating material to the substrate, situated in the electric field, from the reservoir using the magnetic brush;
• applying a second powder coating proximate the first powder coating;
• curing the first and second coating after the application of the second powder coating.

A method for applying powder coatings to a substrate comprising:

• providing powder coating material in a reservoir by a process that modifies a powder paint by recompounding an electrostatic spray powder paint at low temperature;
• and
• incorporating additional additives to the powder coating material while not substantially increasing viscosity.
• supplying an electric field between a magnetic brush having a rotating magnetic field and the substrate;
• and
• applying the powder coating material to the substrate, situated in the electric field, from the reservoir using the magnetic brush.

A powder coating apparatus comprising:

• a reservoir of charged powder particles in the presence of hard carrier particles;
• a movable receiver for receiving charged powder particles from the reservoir of charged powder particles;
• a shell to feed the charged powder particles with carrier particles from the reservoir to a position proximate the movable receiver and to deposit the charged powder particles on the receiver;
• the deposition device comprising a rotatable shell, a rotatable magnetic core, and an electric field between the rotatable shell and the movable receiver;
• a magnetic brush having a rotating magnetic field for applying the charged powder particles to the movable receiver.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush for applying the powder coating material to the substrate, the magnetic brush comprising nonconductive or semiconductive magnetic carrier particles;
• and
• an electric field between the magnetic brush and the substrate.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush for applying the powder coating material to the substrate, the magnetic brush comprising magnetic carrier particles;
• an intermediate transfer member intermediate the brush and the substrate including a nonconductive coating capable of transferring the supply of powder coating material to the substrate;
• an electric field between the magnetic brush and the intermediate;
• and
• an electric field between the intermediate and the substrate.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a rotating magnetic brush for applying the powder coating material to the substrate, the magnetic brush comprising magnetic carrier particles;
• an imaging member such as a photoconductor, electrographic master, or ionographic member intermediate the brush and the substrate;
• an electric field between the magnetic brush and the imaging member;
• and
• an electric field between the imaging member and the substrate.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a rotating magnetic brush for applying the powder coating material to the substrate, the magnetic brush comprising magnetic carrier particles;
• an imaging member such as a photoconductor, electrographic master, or ionographic member intermediate the brush and the substrate;
• an intermediate transfer member intermediate the imaging member and the substrate including a nonconductive coating capable of transferring the supply of powder coating material to the substrate;
• an electric field between the magnetic brush and the imaging member;
• an electric field between the imaging member and the intermediate and an electric field between the intermediate and the substrate.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush for applying the powder coating material to the substrate;
• and
• an electric field between the magnetic brush and the substrate.

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush for applying the powder coating material to the substrate;
• and
• an electric field between the magnetic brush having a rotating magnetic field and the substrate.
• the magnetic brush comprising a conductive shell with an insulative coating

An apparatus for applying powder coatings to a substrate comprising:

• a supply of powder coating material;
• a magnetic brush having a rotating magnetic field for applying the powder coating material to the substrate;
• and
• an electric field between the magnetic brush having a rotating magnetic field and the substrate.
• the magnetic brush comprising a shell that rotates cocurrent with the substrate at a speed less than 10% of the substrate speed.