Most fixed lip slot die coating applications work best when air is removed from the area where the coating is flowing onto the substrate. CCR uses a vacuum box to remove air and help control the coating bead.

Typically, the vacuum box seals against the lower portion of the backing roll and against the bottom half of the die. It is also sealed at each end. The remainder of the vacuum system is used to evacuate the box and to ensure that any excess coating at the beginning or end of a coating run is collected and kept from the blower.

Vacuum Box

A Liberty vacuum box is designed to fit the accompanying die, positioner, and backing roll.

Stainless steel box mounts on die support plate
Removable stainless steel pan is sturdy but light for easy clean-up
Drain hole and vacuum connections provided for connection to drain tank and vacuum supply
End and side seals are plastic backed by stainless steel to maintain good alignment
Magnahelic gauges provide readout of vacuum level at each end of box

Vacuum Supply

CCR also can provide the hardware needed to evacuate the vacuum box.

Regenerative blower for vacuum source, including motor, drive, inlet filter, and muffler
Optional Venturi in place of regenerative blower
Stainless steel drain tank to collect any excess coating at start or end of coating run
Stainless steel separator tank with baffle to ensure fluid does not flow into blower
Appropriate fittings and polyurethane hosing
Optional sanitary fittings
Flow control valve for manual adjustment of vacuum level