Curtain Coater

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Coater description.

    The KOCH Pressure Head Curtain Coater provides a stable curtain of liquid that efficiently coats parts as they pass through the curtain. 

    The Curtain Coater applies a wide range of coatings on flat sheets and panels. The coater delivers high-speed, dependable performance with an accurately controlled film thickness. 

    The pressure head makes it possible to apply a wide variety of paints, adhesives and other liquid coatings in a wide viscosity range. This type of curtain coater head also allows better control of coating than other types of high-speed coaters. 

    Coatings are applied efficiently by a recirculation system that collects all undeposited material and circulates it until it is deposited. Material is pumped from a reservoir by a variable speed material pumping unit. The pump moves the material through a filter to the pressure head. The material fills the bottom section of the head and forms an air cushion in the top of the head. Pressure in the head forces material out of an adjustable opening between precision ground knives that run the length of the head. 

    The precision knives maintain a constant material flow across the width of the head. The large handle on the head adjusts the knife opening. The knife opening controls the velocity of the curtain. When running accelerated line speeds, the knives are set close together to increase the downward velocity of the curtain. Opening the knives wide allows the curtain to fall gently to the processing substrate. 

    The head is supported by screw jacks. The jacks raise or lower the head to give even more flexibility to the curtain coater. The head is raised to increase the distance the curtain falls, therefore, increasing the velocity or allowing thick parts or embossed parts to be processed. As parts pass under the head, material is deposited. More material can be deposited by either increasing the speed of the pump or slowing down the speed of the transport, or both. Less material is deposited when the pump speed is slowed down or the transport speed is increased. The pump's speed is controlled by a variable-speed drive unit. The positive displacement pump accurately delivers the amount of material required at the head. The transport speed is controlled by a variable-speed drive unit and permits a wide range of transport speeds to be selected. 

    The coater is constructed of a very basic but sound design. There are three (3) basic components of the KOCH Curtain Coater:

• The pressure head and support members are assembled as a unit. The assembly is independent from the conveyor so no vibrations are transferred to the curtain.

• The pump, drive unit and filter are pre-assembled on a base.  A section of flexible hose supplies material from the pump unit to the pressure head. The flexible hose isolates vibrations to only the drive unit. A material reservoir tank is provided with the pump unit.  A material trough is located between two (2) transport sections. The trough is directly beneath the pressure head to catch all material that is not deposited on the substrate. The accumulated material drains from the trough to the reservoir tank where it is again picked up by the pump and redeposited.

• The transport system has an infeed and outfeed section. The infeed section is comprised of a set of pull rolls. The outfeed section has a drive roll and tail roll. The drive unit powers both sections to insure a common speed through the curtain.