Vacuum Technology


The Superiority of EVAC System Modules
Evac provides you with process capability and reproducibility at low running cost due to the following System Modules: Patented EVAC Slot, EVAC Separators, EVAC Pumping Station, and EVAC System Controls.

Process Capability and Reproducibility at the Lowest Cost
No other vacuum system available today contains all of these design features, which make Evac systems the superior choice in overall performance.

Vacuum Technology - The Principle
Evac systems integrated into open-width textile ranges will improve fabric quality, increase production speed, signifi cantly lower production cost per meter, and lessen the overall environmental impact of textile processes. Following are just a few examples of how vacuum technology can achieve these advantages for the textile producer.

Improved Fabric Quality
Vacuum technology improves fabric quality by removing lint and dust when dry, and by improving chemical penetration in wet processes. Lint or dust removal can be very advantageous in printing where “stickins” result in second quality fabric. In chemical finishing and pigment “dyeing”, vacuum can pull the chemicals deep inside the fabric, where the end-user appreciates them most. Vacuum technology also prevents the “windowpane” effect, or chemical build-up between yarns.

Increased Production Speed
By lowering residual moisture below the level of typical padmangles, vacuum technology allows stenters and other drying devices to dry fabric faster, thus increasing production speed, or lessen the energy consumption.

Lower Production Costs
In washing, vacuum technology separates contaminants from the washing line before they are carried into following washing boxes. The effect: less clean water is needed, which also results in less energy consumption for hot washing purposes. In finishing, vacuum technology removes the chemicals suspended between fabric yarns. The chemicals stay inside the fiber bundles of the yarn, not in between the yarns, and can, easily be recycled. Therefore, fewer grams of chemicals per square meter of fabric are required when using vacuum technology in finishing than when using the padder alone.

Reduced Environmental Impact
In washing, parts of the counterflowing dirty liquor is sent to separate treatment by using the vacuum system. PVA size, bleaching chemicals or unfixed dyestuffs are removed from the washing line before they enter the succeeding wash boxes. Likewise in finishing, by removing chemicals such a  fluorocarbons, resins, softeners and even pigments normally left in between fabric yarns, very little chemicals remain to become vaporized and exhausted as emissions out of the stenter’s exhaust outlets.

Easy to Handle – Safe Operation
The operator only selects the vacuum pressure needed and the Evac automatically adjusts pump speeds and airflows to ensure consistent pressure and production results. Pumps as well as seals and separators need only minimal, routine

More than 30 Years of Experience
It is not just the quality of our vacuum systems that makes us number one world-wide. It is also the process experience behind the Evac system designs that ensures that the customer receives a vacuum system that is tailored to his specific needs, for as yarn characteristics and fabric constructions vary tremendously, so too do the potential
effects of vacuum pressure vary from fabric to fabric. Take advantage of Evacs knowledge in vacuum technology!

Water Extraction
High line-speed increases with synthetics and blends
Prior to drying cans, stenters or tensionless dryers
Prior to bleach saturators for high chemical add-on
Superior process control through even wet pick-up
Gentle on fabric piles or delicate woven structures

After Cold Pad Batch desizing or bleaching
After preparation steamer
After print washing
After dye washing
After stabilization in mercerizing
Removal and separation of up to 80% of contaminants

Even application of chemistry through fabric width
Improved hand due to deep penetration of chemistry into fiber bundles
No waste of chemicals due to filtering and recycling of chemicals
Faster stenter speeds due to lower wet pick-up

Pigment "Dyeing"
Dyestuff and chemical application in one stenter pass
Excellent wet and dry crock
Minimal capital investment
No migration or clip marks

Lint Removal
Prior to printing to reduce second quality prints
Prior to singing to improve singe
After shearing or sanding for fabric cleaning
Reduces lint and dust build-up on downstream rolls, wash boxes, dryers

See slideshow above for visual representation of the System Modules:

EVAC System Controls
Inverter-integrated vacuum pressure control
Minimized electricity consumption
P.I.D. Loop control
Automatic cleaning features
Automatic signals for filter, separator and drain pump maintenance

EVAC Pumping Station
Water-cooled pump
High volumes of air possible
Long operating life
Inverter compatible
Savings in electricity
Sound enclosure (optional)

EVAC Separators
95% Efficient, blockage-free design
No in-line filters
External filter system
Filter change possible without stopping system or range
Automatic signal on control panel for filter change
Automatic rinsing during lot changes

Patented EVAC Slot
Minimizes blockages
Homogenous effects over entire width
Ideal for pigment dyeing
Low friction UHMW nozzle
Converging-diverging nozzle orifice for maximum efficiency
Suitable for high temperatures and chemicals
Automatic cleaning feature
Teflon-coating inside and out for ease of maintenance

See slideshow above for Standard EVAC Installations illustrations and details.

Textile Non-Woven Vacuum Technology Information Sheet Textile Non-Woven Vacuum Technology Information Sheet
File Type: PDF  |  File Size: 820KB  |  Last modified: 10-29-2010

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