Barco SliverWatch User manual

SliverWatch
Barco introduces SliverWatch, which helps yarn manufacturers to fight the contamination
problem.
This detection system is installed in the creel of draw frames handling the first step drawing
or in the creel of the lapper.
The purpose is to stop the draw frame or the lapper, if a contaminated sliver is detected, so
that the operator can eliminate the contamination, thus avoiding that second step drawing
and spinning spreads the contamination over many meters of yarn.
Contamination detection on draw frames and lappers

How does SliverWatch work ?
- The sliver passes through a diffuse transparent guide.
- Transmitters or LEDs illuminate the sealed inside of the sensor.
- Receivers sense the amount of light in the spherical inside of the
sensor.
- Foreign material absorbs a fraction of the light emitted by the LEDs,
this increases the signal and allows the detection.
- Light is absorbed from all angles, allowing an uninterrupted view of
the contamination, regardless its position in the sliver.
- The shape of the sliver guide does not compress the sliver.
What does SliverWatch detect ?
Any foreign fibre in the sliver, as long as the color is different from the
color of the fibre material.
The absence of a sliver, or a non-moving sliver in the sensor. This means
that the sensor replaces the sliver breakage stop motion in the creel of
the draw frame.
The lack of some special colored sliver in the use of fancy yarn produc-
tion.
Settings
- The length of the contamination is the main setting.
- Minimum length setting, to avoid irrelevant stops.
- Filter settings are available to detect short, intensive contaminants.
- Sensitivity setting based on a scale from 5 to 20.
Specifications
All sensors are wired to a central machine unit which has to be present
on each machine. SliverWatch has been tested for speeds up to 1200
meters/minute.
A central unit with full color display and sealed keyboard, allows user
friendly and menu-driven settings to define the contaminants that have
to be removed.
A lamp tree serves as warning system. The stop position is such that
the contamination is always at the same location ready for the operator
to take it out.
V
rms
Sensitivity
l = foreign fibre length
A = peak area
Signal
Time

Most draw frames have contact rollers installed in the creel as stop mo-
tion. The problems with these rollers are known to the industry.
Once the SliverWatch sensor is installed, a sliver breakage will be detected
and the draw frame will be stopped. Another stop motion is no longer
required.
Sliver breakage stop motion
On lappers up to 24 sensors can be installed in the creel to monitor sliver.
In case a contaminant is detected the lapper is stopped.
A special communication logic avoids the use of long sensor cabling,
which results in an easy, fast and reliable SliverWatch installation on the
machine.
SliverWatch on lappers
Heather yarns (blends of cotton with 1%, 3%, 5% or more black poly-
ester) can be monitored by SliverWatch.
Not enough black or too much black polyester in the sliver, makes
SliverWatch stop the draw frame.
As the position of the PE/CO blend cans versus the pure cotton cans in
the creel is important, SliverWatch will stop the machine if a can position
is not respected by the operator.
SliverWatch on heather yarns
Production data, such as machine efficiency, produced kg, produced sliver
length, number of can changes, number of production stops as well as
quality stops are available in real time and on shift base.
Statistic evaluation: histogram of defects, number of contaminants per
shift, number of sliver breaks, etc.
Production and quality data
The installation of a SliverWatch on cards allows the mill to keep track of
the level of contamination in the production.
The purpose here is to monitor the contamination index of the sliver
can.
The contamination index of the can is an expression which relates to the
number of contaminants per 1000 meters of sliver.
Monitoring on cards

www.barco.com
Integration in the Barco SpinMaster system
All Barco and Loepfe sensor systems and sensors can be integrated in Barco’s SPiNMaSter plant wide monitoring system.
With SPiNMaSter, the whole production process can be monitored starting from opening lines to draw frames, flyers, ring frames, OE
machines, winders and twisters. The SPiNMaSter system also allows the connection of production machines equipped with other (non-
Barco) yarn quality detection or clearer systems.
A total solution to fight contamination in spinning mills
YarnMaster
The YarNMaSter 900 eliminates yarn defects as well as foreign fibers and reports
the events on-line according to international standards, being: thick and thin
places, IPI values, splices, yarn count deviations, imperfections, foreign fibers.
Polypropylene
The polypropylene sensor is added to the BarcOPrOFile®sensor in such a way that
the yarn barely touches the PP sensing head. The sensing head detects colored,
white and colorless polypropylene contamination in the yarn.
In opening lines - Cotton Sorter
The cOttON SOrter RX-CS is a real time system for detection and removal of
contaminants in raw cotton. All unwanted material that differs from the cotton
throughput will be detected by ultra-fast CCD cameras and removed by a special
pneumatic ejection unit.
On draw frames - SliverWatch
This detection system is installed in the creel of draw frames handling the first step
drawing. The purpose is to stop the draw frame if a contaminated sliver is detected,
so that the operator can eliminate the contamination. This avoids that second step
drawing and spinning spreads the contamination over many meters of yarn.
On Open-End spinning frames - ABS
The ABS sensor is installed on the yarn withdrawal tube in the spin box. ABS can
be installed on OE machines regardless the presence of whatever type of yarn
clearer. With ABS the sensor simply comes as an add-on, replacing the original
yarn withdrawal tube with an “intelligent” one. This way, the original investment
in yarn clearing is safeguarded.
Barco n.v.
Th. Sevenslaan 106
8500 Kortrijk
BELGIUM
Tel (intl) 32 56 262611
Fax (intl) 32 56 262690
e-mail: [e-mail]
A00526 03 EN 23/8/2007 DPD
Barco Sedo GmbH
Neuwies 1
35794 Mengerskirchen
GERMANY
Tel (intl) 49 64 76310
Fax (intl) 49 64 763131
e-mail: [e-mail]
Barco Loepfe srl
Via El Alamein, 11/C
22100 Como
ITALY
Tel (intl) 39 31 3370457
Fax (intl) 39 31 305565
BarcoVision Ltd
Capricorn Park
Blakewater Road
BB1 5SQR Blackburn, Lancashire
UNITED KINGDOM
Tel (intl) 44 1254 662244
Fax (intl) 44 1254 267100
BarcoVision LLC
4420 Taggart Creek Road
Suite 101
28208 Charlotte, North Carolina
USA
Tel (intl) 1 704 3929371
Fax (intl) 1 704 3995588