Foil measuring device RMK-9T

Plastic films made of polyvinyl butyral (PVB) are required for the production of laminated safety glass.

Reliably Determining the Water Content in PVB and SGP Films

PVB films bond the glass panes of laminated safety glass
and hold the glass fragments together in the event of breakage. For
reliable adhesion, a
water content of approximately 0.4 to 0.65% is optimal.
Excessive moisture can impair adhesion and lead to
the film peeling away from the glass surface.

The RMK-9T quickly determines the water content
using near-infrared measurement. The special alternating light method
reduces many sources of interference. Optionally, the
film thickness can also be determined and taken into account
during evaluation.

Moisture measurement range
0–1%

Moisture Accuracy
±0.01%

Reproducibility
0.005%

Response time
T90: 1 second

Optional Thickness Measurement
0–2 mm

Thickness Tolerance
±0.02 mm

Two measurement options

Measurement before or after lamination

Depending on the production step, the water content can be determined on the individual
PVB/SGP layer or directly on the fully laminated
laminated glass pane.

Unlaminated layers

RMK-9T as a benchtop meter prior to lamination

Laminated Glass Panels

measurement system with traverse and mirror

RMK-9T Film Moisture Meter for Measuring Moisture Content in PVB and SGP Films

Before Laminating

Measurements on Unlaminated PVB and SGP Layers

The RMK-9T is used as a benchtop measuring instrument.
The individual PVB and SGP layers are positioned one after another
on the measuring surface and tested immediately.

Measurement prior to the lamination process
Individual measurement of the PVB or SGP layers
Quick Check of Water Content
Optional additional measurement of film thickness

Typical application:
Quality control of the film prior to further processing.

Truss system for measuring the water content of laminated safety glass

Sensor head mounted on a laminated glass pane with a PVB or SGP layer

After lamination

Measurements on laminated PVB and SGP layers

For laminated glass panels that have already been laminated, a
measuring system with a traverse can be used.
The measuring head is positioned above the desired measuring position
; a mirror is located
beneath the glass panel.

Measurement taken directly on the fully laminated pane
Positionable measuring head on a crossbeam
Mirror under the laminated glass pane
Suitable for measurements at various positions

Typical application:
Testing the water content directly on the finished laminated glass.

Two Measurement Methods—One Goal

With the RMK-9T, the water content can be checked either on the
individual PVB/SGP film prior to lamination or, using a
appropriate crossbeam system, on the fully laminated
laminated glass pane.