The Superwash process is an application that has special requirements to which the control system must conform to ensure the product quality is maintained to the desired level.
Streat Instruments Moisture Measurement and Control systems have been applied to Superwash Plants around the world and we were involved with the initial Superwash development at the IWS and then the Woolmark Company.
Jimmy Jackson*, widely regarded as the expert in the area of easy-care wool products and processes, recommends Moisture Measurement and Control for Superwash Lines as detailed below:
Moisture management & control is important in the
Superwash process to save energy and control the
regain in the sliver so that subsequent mechanical
processing is trouble free, and also maintain good
wool colour etc.
The additional advantages for a Superwash plant
are ensuring that the resin is evenly and constantly
cured. (i.e. If the Superwash wool is still wet or
damp, and hence the resin is not fully cured, then
curing will take place later in the bale after packing
resulting in the fibres sticking together and the
customer receiving hard tops, which will need to be
backwashed at additional expense before
Resin curing also impacts the dyeing properties of
Superwash wool. As the resin cures it loses its
cationic charge and becomes neutral. However if
there are some damp patches then in these areas
the resin will remain cationic charged and attract
the anionic dyestuff (all wool dyestuffs irrespective
of type are anionic) more rapidly. In essence if there
is uneven curing then it’s more than likely the
dyeing will be uneven.
DRYCOM Moisture Sensors on
Superwash Sliver at the Dryer Exit
The Streat DRYCOM Moisture Measurement & Control system continuously monitors the moisture content of the sliver and regulates the energy supply to the dryer to maintain the moisture at the desired level.
Streat DRYCOM Moisture Measurement and Control systems provide total solutions for your process.
Manufacturers of both nonwovens and traditional textiles are becoming increasingly aware of the importance of moisture management during processing. Its well known that fibres perform differently during the carding, lapping, needing and spinning processes. Finding and maintaining the optimum moisture content provides clear benefits in both processing performance and product quality.
“Over-dry material creates static problems,” says Jim Herbison, Managing Director of Streat Instruments. “It can also reduce fibre strength, resulting in excess fibre breakage, increased drop out and reduced yields. On the other hand, a product that is too wet blocks fibre transports, causes roller laps and can lead to the build up of bacteria.”
Streat Instruments moisture systems are designed to assist users in optimising production conditions in order to maximise productivity, quality, operating efficiencies and profitability in the nonwovens and textiles industries. Over the last three decades he New Zealand-based company has earned international recognition as a premier manufacturer and supplier of moisture management technology.
The new Drycom Connect combines well proven Streat control technology with a dedicated smart-phone and tablet app, which allows operators to view moisture and associated production data from their production plants in real time, at any time, from anywhere.
“The Drycom Connect App is a valuable management tool, empowering users to monitor system data remotely,” says Herbison. “Having a mobile option provides an increased level of control as well as peace of mind.”
The App can keep track of multiple systems within the plant and can be integrated with data from fibre weight control systems by Streat’s sister company Garnett Controls.
Drying is one of the most energy intensive operations in textile mills. Streat Drycom empowers processors to reduce energy usage by optimising the drying process.
Drycom ensures consistent moisture by continuously measuring the moisture of the fibre, yarn, nonwoven web, or other product outputs at the exit of the dryer.
“Drycom automatically controls the energy and/or speed of the dryer to maintain the desired level of moisture,” adds Herbison. “In addition to ensuring consistent moisture content, the productivity gains and energy savings provided by our systems are considerable.”
Hundreds of Streat Drycom systems are already providing users in over 40 countries with the tools they need to operate sustainably, optimise production processes and maximise productivity, quality, operating efficiencies and profitability.
In processing areas such as opening and blending, carding, and web forming, plant humidity control is not enough to ensure optimum moisture conditions. Micro-climates within machinery often dry the fibre, making downstream processing difficult or impossible. It’s not uncommon for plants to run at high humidity levels (up to 70+ % RH) in order to drive fibre moisture content up to manageable processing levels. High humidity creates an uncomfortable environment for workers, high energy costs, and potential machinery damage.
Drycom measures the fibre directly. Moisture can them be managed in a manner appropriate to the process, such as targeted moisture application by precision spraying devices. Experience in all types of natural and man-made fibres has enabled Streat to build a portfolio of application-specific technologies to ensure sustainable production.