Lamination And Coating Machine Exporter In Nigeria

Paper board is coated with plastics to combine the me-chemical properties of the paper board with the barrier and sealing properties of plastics. Paper board combined with a relatively small number of plastic materials will provide the extra features needed to make the paperboard suit-able for a number of specially demanding applications. Extrusion coating is a process whereby molten plastic is applied to paperboard and subsequently chilled to form an extremely thin, smooth layer of uniform thickness. The molten plastic can be used as an adhesive to laminate a plastic film or a metal foil.

Coating Process in Lamination Machine:

The actual process of extrusion coating involves extruding resin from a slot die at temperatures up to 320°C directly onto the moving web which may then passed through a nip consisting of a rubber covered pressure roller and a chrome plated cooling roll. The latter cools the molten film back into the solid state and also imparts the desired finish to the plastic surface. The web is normally run much faster than the speed at which the resin is extruded from the die, creating a coating thickness which is in proportion to the speed ratio and the slot gap.

Process description for Lamination Machine:

In the extrusion coating process an extruder forces melted thermoplastic resin through a horizontal slot-die onto a moving web of substrate. The resulting product is a permanently coated web structure. Extrusion lamination is a similar process to extrusion coating, where the resin is extruded between two substrates and acts as a bonding agent.

Inside an extrusion coating and laminating line the substrates and melt are nipped at a bonding station. This consists of a large roll, a pressure roll, and a counter-pressure roll cooled by water. The combination of the pressure between the rolls and the temperature permits delivery of the correct adhesion level.

The final product is rewound as a permanently bonded multi-ply laminated structure. Most plastic films and foils require a primer coating before they are used in the extrusion process.