Process Sensors (Europe) Limited
Process Sensors

 Applications - Textiles and Miscellaneous Applications

  Why Measure?
Measurement of moisture in cotton, linen, silk, wool, leather or synthetic materials such as polyester and nylon is all important from the aspect of: assuring the quality of the fibre is fit for purpose, maximising yield and adding value, process-ability, minimising energy consumption, ease of handling and tactile properties of the final material. Textile processing is multi staged and energy intensive. Different operations will require the product to be at different moistures for optimum efficiency, thus installation of textile moisture sensors at key locations enables control of dryer temperature and moisture addition.
 

Textiles and Miscellaneous applications

Acetate tow Polyester filler
Cotton Tyre Cord
Leather Sewerage sludge

Sensor
The MCT 360 measures moisture in cotton and other textiles. Its standard configuration includes an airpurge window to ensure that when hooked to an air supply the gauge window and light-path is kept free of dust. Near Infrared textile moisture measurement is inherently safe, non-contact and won’t alter the moisture level of the product. When mounted on-line, the MCT 360 will provide a continuous profile of the moisture level either in the machine direction or cross web if mounted on a scanning frame. In very dusty environments an Atex rated NIR sensor, the ATEX22 -MCT 360 is recommended. In cases of high temperature installations, the MCT 330-HD is an alternative option to the MCT 360 with a vortex cooler which negates the requirement for air or water coolant up to 65 degrees Celsius. The MCT 660 lab instrument is sold for off-line use.

Accessories
Depending upon the measurement location, i.e. viewing into a hopper (e.g. on a cotton seed hopper) or over a non woven web (e.g carder), the type of accessory that might be useful differs. A Sapphire viewing window mounted in a stainless steel flange is a practical means of looking into a hopper and a product hi/lo alarm board would be advantageous on a gauge located after the driers on the gin stand, it could alert the operator to moisture levels falling outside the optimum operating range, enabling manual or automatic changes to be made to the drier temperature. Vortex coolers are available for high temperature installations above an ambient temperature of 45 degrees Celsius and a network card can be simply fitted within the moisture gauge if required.

 

Gauge outputs, Operator Interface & Display
Up to 3 x 4-20MA or 0-10V
RS232 or RS485
Optional bus
Optional Operator Interface and display unit

 

The Measurement
Textiles are natural fibres derived from plants or animals, or are manmade as in the case of polyester and viscose. Natural fibres are hygroscopic, rapidly adsorbing moisture in humid atmospheres and losing water in drier atmospheres. Synthetic fibres can be either hygroscopic, e.g. nylon, or hydrophobic as in the case of polyester. Measurement of moisture is typically made on a dry weight basis. Measurement accuracy will be affected by product presentation and the state of moisture equilibration as NIR is a surface biased measurement technique. The best measurement will be obtained on equilibrated homogenous product. Note that owing to the low density of some non woven products, it is necessary to install the gauge at an angle to increase the amount of product the gauge views and thus improve the signal level (this increases the effective pathlength).

Textiles and Miscellaneous applications

  • Cotton
  • Acetate tow
  • Tyre Cord
  • Polyester filler
  • Leather
  • Sewage Sludge
Sensori di processo Italia China