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Protector Coating

A supply system that maintains the surface properties of paper material, enabling printing on offset coated paper

image: A supply system that maintains the surface properties of paper material, enabling printing on offset coated paper

The RICOH Pro VC60000, a high-speed continuous feed inkjet (IJ) printing system, prints high-quality images at high speed on offset coated paper, which does not absorb aquatic inks well. Conventional continuous feed IJ printers were not capable of printing on such paper. The RICOH Pro VC60000 consists of four functional units: undercoating, printing, protector coating, and drying.

Undercoating unit: Applies an undercoating agent to prevent ink unevenness and abrasion.
Printing unit: Forms images by discharging quick-drying pigment inks onto the paper.
Protector coating unit: Applies protector coating agent to protect the printed surface.
Drying unit: Dries and fuses the supplies including the inks by way of a heater.

The description below refers to protector coating.

Background

In the past, when printed paper was rubbed, inks sometimes fell off and the image quality deteriorated.

image: Without protector coating
Without protector coating

Solution

The protector coating agent consists of resin and lubricant. The agent is applied to the printed inks to protect the printed surface and improve anti-scratch properties against abrasion.

image: With protector coating
With protector coating

Technical highlights

Ricoh's original scheme of friction force reduction protects the printed surface while maintaining the surface properties of offset coated paper.

Application of the protector coating agent

The coating agent, which contains resin and lubricant, is applied to the inks on the printed surface. Then a drying process evaporates and removes the solvent of the coating agent, so that the inks are coated.
This scheme forms an even film and secures a strong ink film. The film reduces the surface friction coefficient of the ink face, improving the sliding properties and anti-scratch properties against friction.*1 This technology is an excellent application of the IJ ink material technology Ricoh has developed over many years.

  • *1 Moving the paper while it is in contact with something else

image: Applying the protector coating agent
Applying the protector coating agent

Applying the protector coating agent

Ricoh's protector coating agent enhances anti-friction properties in a very small amount. Too much of it would be applied even with the roller application method used to form a thin film for undercoating.
For protector coating, an inkjet application method is chosen, as it can control very small amounts of application.
The inkjet application method does not coat the entire printed surface at once as with the roller application method. It applies an appropriate amount of coating agent on the inks, so it improves anti-friction properties while maintaining the surface properties of the paper used.
This technology is an excellent application of the IJ head technology Ricoh has developed over many years.

Technology categories: Field – "Printing" | Product – "Production printer"