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TubularCompaction

ControlFinishing tubular fabric to weight (GSM)results in unpredictable residual lengthshrinkage.

Finishing to course count (CPI) yieldspredictable residual length shrinkage.

An optical abric density measuring sensor can provide the meansto automatically control the compaction o a tubular compactor toachieve the desired course count.

An automatic compaction control system based on densitymeasurement and control will:

Eliminate over- and under-weight abric.Reduce or eliminate punch-weight measurements.Provide consistent results rom all operators.Result in uniorm abric, seam-to-seam.Yield predictable residual shrinkage.

Te Automation Partners Inc. CCS-300 Compaction ControlSystem uses nished abric density as the measurement and controlparameter. An optional width measurement sensor can be added tothe system to provide automatic control o abric width, resultingin the highest quality abricnished correctly every time.

FabricDensity

MeasurementandControl

Finishing to fabric density

results in predictable

residual shrinkage . . .

. . . nishing to fabric weight

yields unpredictable residual

shrinkage . . .

. . . therefore, rely on coursecount, not weight!

How cotton and cotton-blend circularknit abric is nished determines theamount and uniormity o lengthwiseshrinkage.

Finishing abric to a specic coursecount provides better lengthwiseshrinkage results than nishing to a

specic weight.

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percentlengthshrin

kage 0

-4

-8

12

1 2 3 4 5production samples

constant course count (18 C/cm)

constant weight (137 g/m2)

The Advantage

of Fabric Density

Measurement

and ControlIn a study by Cotton echnology International,ve plain jersey abrics were nished to constantweight and width, and ve were nished toconstant course count and width.

Te results shown in the graph above:

Fabric nished to constant weight(137g/m2) will have shrinkage that var-ies rom -3.8% to -10.1% as yarn countvaries. Tis 6.3% range is unacceptableto most customers.

Fabric nished to constant course count

(18 C/cm) will have shrinkage that onlyvaries rom -6.4% to -7.1%. Tis 0.7%range is preerred by customersandattainable with CCS-300.

Compaction

Control

How It Works

A PSM Sensor measures the courses o knittedabric at the exit o the compactor.

Te process controller/operator workstationcompares the measured density to preset param-eters and automatically adjusts the compaction tomaintain a constant course count in the nishedabric.

Te control parameters are selected by the com-pactor operator rom a list o predened stylerecipes on the operator workstation.

Control Width

Control Densi

In addition, the system measures the relativespeed between the main roll and the retard rollto monitor the percent compaction. Tis per-centage is compared to adjustable maximum andminimum limits.

Automatic control is limited to these presetlimits to prevent abric and compactor damagecaused by excessive compaction.

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0 200 400 600 800 1000 1200

yards

C

PI

41

42

43

44

45

46

47

target

The compactor begins in manual

mode. The fabric is over-compacted

and has a large variance in course

count since the compaction is set at

a fxed value.

At approximately 660 yards, the

operator switches CCS-300 to

automatic mode.

Once placed in automatic mode,

the compaction was immediately

reduced. CCS-300 adjusted the

course count to the desired set

point and maintained it through the

entire process.

The Results are ClearTe chart below shows the benets o using automatic control o a compactor over manual control. We started the compactorin manual mode, noted in black. At approximately 660 yards, we switched CCS-300 to automatic mode, shown in purple.

Clearly, CCS-300 provides uniorm course counts, which gives nishers predictable shrinkage and eliminates overweight abric

Optional Width Measurement

and Control

Adding the optional width measurement deviceprovides or the automatic control o nished abricwidth.

CCS-300 with this option results in the highest qual-ity abricnished to the exact density and widthper specication.

Optional fabric width measurement unit

mounted with a PSM-200 Sensor under

the fabric on a tubular compactor.

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Contact Us

With CCS-300,residual shrinkagewill no longer be a problemit will be youradvantage.

As stated in the article Infuence o the Spinner onthe Shrinkage o Cotton Circular Knits(Cottonechnology International, 1996), Te practi-cal efect upon the shrinkage o a given abricconstruction, o diferences in yarn tex o 3%,depends upon whether the nisher is attemptingto deliver a constant length in the nished abric,or whether he is attempting to deliver a constantweight per unit area.

Te studies concluded that nishing abric to a

specic course count provides better lengthwiseshrinkage results than nishing to a specicweight.

Buying a Tubular Compactor?Ask your supplier to add course count measurement and control to your new machine. Many ma-chine manuacturers already use the PSM-200 System and integrate it with their machine controlsto provide an integrated package or abric density measurement and control. Get the advantages opredictable shrinkage as soon as you get your new machine.

Speciy the Automation Partners PSM-200 System to make certain you are getting the best.

Automation Partners Inc. has provided electronic solutions to the textile industry since 1990.With thousands of sensor systems and control systems installed worldwide, API is the marketleader in this technology. You can count on this experience and performance to be assured ofgetting the best productand the best serviceat a fair price.

Salesel: +1 951 698 9901 or 1 800 466 1203Fax: +1 951 698 9932

ino@automationpartners.comwww.automationpartners.com

Mailing address:Automation Partners Inc.364 Blodgett Street, Suite BCotati, Caliornia 94931-8701USA

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