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The roller pressure
is adjustable up to 40 psi. The Membrane
Feed module is used to feed backed or un-backed membrane
for lamination to the plastic backing with adhesive. The station also
includes take-up reels for the membrane liners and for adhesive release
liners. This module provides for precision tension control and guidance
of the membrane while being laminated onto the plastic backing. The
module includes a pneumatically controlled lamination roller. The
roller pressure is adjustable up to 40 psi. The Dispenser module
is used to dispense onto the web at some point in the lamination
process. A typical application would be to dispense lines onto the
membrane after lamination. The module can accommodate up to 8 dispense
heads which could be either BioJet or AirJet dispensers. Each dispenser
can be configured with an inspection/mark system. This module is
equipped with an ionizer to eliminate static charge build-up on the
membrane prior to dispensing. The Drive Capstan module
consists of a pneumatically controlled pinch roller which is used to
move the web through the system. The pinch roller speed is variable
from 1-100 mm/sec. The roller pressure is also adjustable up to 40 psi.
A Cutter/Dancer
module can also be configured into the Automated Laminator
system. This module provides an option for cutting the web into
individual strips that are collected in a chute. The dancer is used as
a buffer for the cut process that momentarily stops the web motion at
the cut position. The dancer radii are maintained at 50 mm (2") to
minimize bending stress. The cutter is a guillotine type that has a
collection chute configured to receive the cut strips. A cut strip
length is generally in the range of 300 to 1500 mm in length. If
re-reeling the laminate is needed a Take-up Reel module
can be configured. This module is used when the lamination is thin
enough so as not to damage any of the layers with bending stresses
generated by re-rolling. A Vision/Inspection
Mark module can also be configured and consists of a
vision camera with a marker system to inspect the laminate. Two
inspections are performed. The first is for mechanical alignment of
different layers. The second inspection is for marks from previous
process steps. In the latter case a final mark is placed on the
membrane which can be machine read at the final cut and assembly stage.
A final module that can be incorporated is a Punching module. The Punching module
consists of a die punch with a cam actuator and a pressurized pinch
roller. The die punch is used to punch simple hole configurations such
as circles, squares prior to lamination processes.
The types of tests
formats would include immunoassays based on the lateral flow format or
dry chemistry formats using treated pads laminated to a plastic
backing. A typical application would be the lamination of a rapid
diagnostic test strip or urine test strip. After lamination is
complete, other processes can be performed such as addition of
impregnation steps, additional lamination and/or cutting of the
lamination into final test strips.
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