B.E.L.'s  HVOF.NUCOAT™

High velocity oxygen-fuel is the state-of-the-art processing system designed and built by B.E.L. for the coating of Tungsten Carbide to produce the hardest and most durable rollers.

The process reaches supersonic speeds and propels the tungsten carbide powder, fed with carrier gases directly onto the roller, resulting in low heat absorption of the substrate and minimal distortion. Uniform uninterrupted distribution of the coating guarantees high efficiency of Tungsten Carbide powder deposits for long-term operations for Anilox roll coating.

The present system uses a process ensuring consistent repeatability in the advanced accurate mixing of gases which occurs in the gun. The Tungsten Carbide deposits have a high bond strength, the speeds and energy are controlled in an accurate manner to increase hardness of the coating, the combination of spherical Tungsten Carbide material within a matrix of nickel are blended together the round particles allow stress to pass smoothly through the deposit ensuring a consistently harder Anilox roller coating.

The coating structure is characterized as completely dense and defect free. The HVOF sprays powder at  high velocity on to the substrate and spherical particles of up to 2,500 + or - 500 HV hardness, gives reduced porosity with a strong metallurgical bonding between the Tungsten Carbide layer and the base material of  the Anilox rolls. This results in corrosion resistant and provides a greatly extended life and performance of the Anilox roller.

HVOF Tungsten Carbide surface treatments are unique for Anilox roller preparation. It is the result that makes the surface coating so special ensuring dense structures. The overall hardness and porosity are far superior to any other process and have proven to be extremely cost effective.

ANILOX TUNGSTEN CARBIDE ROLLERS AND SLEEVES

The B.E.L. Group Patent NUCLEUS ANILOX ROLLER™ and sleeves are applied with Tungsten Carbide  NUCOAT™ the coating contains the hardest particles of all carbides 2.500 + or - 500 HV, maintaining reliable mechanical and physical properties for Anilox roll coating.

Anilox rolls are exposed to the rigours of the flexo printing production environment ceramic wear is a constant affect of aggressive pigmentation, metallic inks and chemical  additives which speed up drying or improves shine, wherever abrasion, corrosion, erosion and doctor blade pressure is present wear can occur.

One of the most significant reoccurring problems for ceramic Anilox rollers is when the ceramic material it self is transferred from the Anilox roll or sleeve into the ink. These very hard particles are circulating against the blade therefore cell walls can brake through, streaks and lines can appear and the overall Anilox roller can wear more quickly resulting in pore low density print. When filtration has been tried, the fine ceramic particles can be difficult to accumulate with traditional filtration methods. Magnetic filters are inoperable because the ceramic particles are not magnetic, making these print conditions an inevitable scenario for persistent wear of all ceramic Anilox rollers.

Tungsten Carbide NUCOAT™ spherical grain powders is an ideal material for Anilox coating and can not be surpassed under these conditions.

Tungsten Carbide hard coatings which are diamond ground and super finished prior to Emerald Laser Engraving© creates a high performance printing, coating Anilox roller or sleeve saving time and money while increasing service life reducing downtime which can occur when changing worn Anilox rollers.

                                                 NUCLEUS ANILOX ROLLER™