(1.5 mm) or Less
From Registration Mark
Other Marks Subject to Tests
Depending on Application
Material Color Range:
Material Color Range:
(4 to 70° C)
Specifications are subject to change without notice.
The Register Control System supplies all necessary
electronics and controls with the exception of the
double differential in the drive of the rotary
knife. The double differential is supplied by the
Model 1109 Dandy Roll Control™ Technology automatically controls
the application of all types of watermark, bug mark and security
marks to ensure consistent application of such marks prior to
further processing. Through system integration with production
equipment, this inspection technology is adapted to specialized
applications to ensure in-register processing of web materials.
It is suitable for many types of watermark processing in
writing, text, cover, security and private authorization
registration or similar process controls.
Detect Any Mark:
Since register mark variations are inevitable due to
temperature, humidity, web expansion and contraction, it is very
important to implement a proportional closed loop methodology as
constant dandy roll speed cannot compensate for mark spacing.
Our proprietary drive control circuitry enables us to control
the rotational speed of the dandy roll. This determines the
linear spacing of the watermark and/or bug marks along the web
at the wet end of the machine in comparison to the measured mark
spacing at the take up end. Upon detection of the in-register
marks, their spacing is measured, displayed and compared to an
operator adjustable set point. If there is any variations an
error signal is generated and inputted into the closed loop
methodology for feedback signal response to close the control
loop upon application.
The SLC module (sheet length control) must function with a large
transport delay due to the time required for the web material to
travel the length of the machine. This could be 30 seconds at a
machine speed of 900 fpm (274.32 m/min). This delay is the time
differential when the feedback signal response is applied to the
dandy roll drive controls and its affect is monitored by the
take up sensor. For example, a machine operating at 900 fpm
(274.32 m/min) travels 180 inches per second (457.2cm/second)
and has a mark placement every 72 inches (182.88cm) thus
generating a 400 millisecond mark spacing. Theoretically, a new
measurement, reading and correction can be provided every 400
milliseconds. However, this is not necessary nor desirable since
the transport delay is 30 seconds. Temperature, humidity or
other environmental conditions causing the in-register mark
error at the take up sensor station occur very gradually over a
relatively long period of time, 30 minutes or so. Therefore by
slowing the process error anomalies down to several transport
delays, the drive controls will have sufficient time with
minimal stress to catch up and reduce the error to zero
(measurement equaling the set point). By implementing this type
of methodology, our register control technology is compatible
with a wide range of illumination, sensing, and signal
processing technologies for detection of any type of mark
including keyed and none-keyed marks.
The Dandy Roll Control Technology can help your company improve
product quality by automatically controlling material
registration within customer specifications. Choose SDT's Dandy
Roll Control Technology for faster, more reliable, control of
the delivered quality of your products.
Our registration control technologies will help you to
significantly reduce your company's costs for producing,
sorting, and disposing of mis-registered products. They can also
help to reduce costs for machine downtime and customer returns.
Achieve High Speed
A pulse generator, combined with our illumination, sensing, and
signal processing technologies, ensures that registration
accuracy is maintained throughout the process at any process
speed. Since the pulse generator is integrated with a machine
driven shaft, registration accuracy is not speed dependent.
Call us today to discuss your register control application and
to learn more about the industry's most complete line of web
inspection related products.
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