Plasma Machines

32 Pages·2012·4.73 MB·English

by  Monica Cozzi

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Plasma eam ag ashing Dryers The ompany
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Plasma Machine
A new plasma technology highly innovative in
the field of superficial treatments of the materials,
it is based on a DBD electric discharge.
(Dielectric Barrier Discharge)
Radicals, active chemical species and loaded
species are produced and with them it is possible
to realize processes of non-conventional superficial
modification.
The modifications applied to the surface are on
nanometre scale at room temperature
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What is Plasma?
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In physics and chemistry, a plasma is typically an ionized gas.
Plasma is considered to be a distinct state of matter, in contrast
to gases because of its unique properties. "Ionized" refers to
presence of one or more free electrons which is not bound to
an atom or molecule. The free electric charges make the plas-
ma electrically conductive so that it responds strongly to elec-
tromagnetic fields. Plasma typically takes the form of neutral
gas-like clouds (e.g. stars) or charged ion beams, but may also
include dust and grains (called dusty plasmas). They are typi-
cally formed by heating and ionizing a gas, stripping electrons
away from atoms, thereby enabling the positive and negative
charges to move more freely.
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THE PROCESSES
The superficial modifications take place thanks to the
high plasma reactivity and processes trigger.
• Physical type (bombing of the surface).
• Chemical type (reactions with radicals).
The processes concern
• Reaction of atoms insertion or complete chemical
groups (grafting).
• Generation of free radicals on the surface.
• Polymers deposition in a gaseous phase as thin layer
adherent to the surface (film deposition).
• Superficial ablation of the material (etching).

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Innovation:
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• It generates innovative materials and new surface
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• It does not modify the bulk property of the material.
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la • Negligible quantity of chemicals.
P • Dry process, which does not require solvents or
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chemicals dangerous for the environment.
The DBD technology with respect to the plasma common
technologies operates at ATMOSPHERIC PRESSURE
• Production processes in continuous way.
• Process times are highly reduced.
• All disadvantages due to the preparation of vacuum
plants are avoided.
• It is not necessary to use seal devices.
ENERGY SAVING AND A LOWER ENVIRONMENTAL
IMPACT.
THE APPLICATIONS
• Increase of wettability.
• Increase of hydrophilicity.
• Water-repellent and oil-repellent surfaces achieved.
• Biocompatibility (antibacterial properties of adhesion and
affinity to proteins and other bio molecules).
• Dyeable (increase of dyeing speed).
• Print (increase of absorbed colour quantity by the textile
fibres).
• Adhesion (increase of spreading adhesion with
specific compounds.)
THE FABRICS
It is applied to fabrics and yarns of natural and artificial
fibres without modifying their bulk properties:
• The organoleptic properties and the transpiration are
unchanged.
• Fabrics with multifunctional properties can be obtained.
• They can be applied to all textile-working phases from
the fibre until fabric finishing process.
• They can be easily introduced into the productive
processes.
The materials that can be functionalised are:
Polypropylene, polyethylene polyester, nylon, natural
textile fibres, etc.…
• Fabrics for clothing.
• Fabrics for furnishings.
• Technical fabrics (filtration, medical, pharmaceutical).
• Non-woven fabrics.
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THE MACHINE
• It is based on DBD discharges.
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• It operates under atmospheric pressure with air or inert
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gas and several gas mixtures.
• It produces plasma between two or more electrodes in n
which the fabric runs. s
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• Different speeds (1-60 m/min).
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• Treatment on one or both fabric sides. a
• Fabric width up to 400 cm. c
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- Stainless steel AISI 304 body,
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fabric transportation
rollers, suction at the entry
and exit.
- Two corona effect
stations for
treatment on both
fabric sides or for
a double treatment
on a single side.
- High
tension/frequency
electric generator,
with automatic
control power, PLC
controlled.
- Electrical board
containing all the
and control devices.
- Self-centring
contact batching
device.
MACHINE CONSTRUCTION:
Structure: stainless steel AISI430withTitanium,
4mm thickness guaranteedagainststresscorrosion.
Inlet hood
Continuous tensionless in-feed with the option to
haveafabricpre-humidificationfacility.This allows
thereductionofUreaintheprintpaste andwillgive
abettercolour yieldandbrightness totheprints.
Inlet section:
• Continuous movement of the chain thanks to the
Specialcamsystem(Patended).
• The loop formation occurs by means of a cylinder
with silicone insert and a steam spray bar
(Armstrongspraybar)which, besidepushingdownthe
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loop, also eliminate the possible electrostatic
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charges.
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•Rodsarefirmlylinkedtothechain for troublefree
2 fabric transportation on rods with silicone strips.
Theshapedprofile guaranteesanoptimalfabricgrip
through all the steaming chamber allowing to work
with full loop length (max. productivity of the
machine).
• The exclusive ARIOLI device being the “differential
steamdistribution”.
VENTILATION SECTION ISCOMPOSED OF:
•N° 4fansfor thesteamandairre-circulation
•Water tanksfor thesteamsaturationbeforeinjectionintothesteamingchamber, tocompensate thepipeline steam
overheatingandgrant a perfectsaturationandhumiditycondition.
•Nozzles,sprayingatomizedmixtureofwaterandsteamtocontrolthesteamtemperaturewhenworkingin satu
ratedcondition(102°C)andgiveback perfectmoisturecontenttothere-circulatedsteam.
• Thermo oil radiators for H.T steaming and Hot air curing. Alternative heating systems such as Gas burners can be
supplied.
Outletsection:
Justliketheinlet sectionthereis a door, acatwalkandtwowindows(oneonthedoor andone onthewallopposite to
thedoor)toviewtheinsideofthemachine.Extractionrollerwithasiliconecoveringguarantees a good transportation
ofthefabric.
Outlethood:
Similartotheinlet hood butwithacylindertoextractthefabricfrom thechamberandbringit totheplaiter.
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SPECIFICATIONS model 200 250 350 400 450 500
Linear fabric capacity m 200 250 350 400 450 500
Standard roller width mm 2200 - 3600
Working speed m/min 4 - 40 5 - 50 7 - 70 8 - 80 8 - 80 8 - 80
Dwell time min 5 - 50 5 - 50 5 - 50 5 - 50 5,6 - 56 6,2 - 62
Average steam consumption kg/h 400-700 450-800 500-900 600-1150 700-1300 800-1450
Saturated steam working temperature °C 102 - 106
H.T. steam working temperature °C 165 - 190
Hot Air working temperature °C 90 - 190
Installed power heat kcal/h 140.000 140.000 280.000 280.000 280.000 420.000
Installed electric power kW 24,5 24,5 37,4 37,4 37,4 49,4
Absorbed electric power kW 19,6 19,6 29,9 29,9 29,9 39,5
Length L mm 9.600 10.900 13.500 14.800 16.100 17.400
Width B mm TAV + 1000
Height mm 4.170
STEAMING FORCOLOUR FIXATION
The highversatility of Ariolisteamagers, together withthe highqualitativestandards, allows their utilization in all continuous produc-
tion lines for thecolour fixation processes. In particular, the steam agers arevery easy tobeused onmany kinds of fabric with different
printingrecipes andchemicals. The know-howdevelopedinmore than 50 years of experiencemakes Ariolithe best technical choice
for high quality fabricsmanufacturers.
Application examples:
•Printed colouring fixation on dryfabrics (ex. Acidonnylon-lycra)
•Printed colouring fixation on wetfabrics (ex. Basic on acrylicblankets)
•Two phase printedcolouringfixation(ex. Indanthrene onmilitarypoly-cotton)
•Two phase dyestufffixation (ex. Dyed indanthrene on poly-cotton for overalls)
•Dyestuff fixation (ex. Reactive on pad-dyed cotton)
•Dimensional shrinkage (ex. Nonwovens, elastic fabrics)
•Resins polymerization in hot air (ex. Pigments on cotton).
DIFFERENTIAL DISTRIBUTIONOFSTEAM
The steam distribution inside thechamber must notbeuniform, but concentrated in thefrontpart of the machine. The“games”take
place in the first 5-6 loops: steam immediately condensates on the fabric. The exothermic reaction, due to steam condensation, to
colourfixation andurea dissociation, takes place in a few seconds. To reach thispurpose, wehave developedaspecial injection system,
concentrating about 70% of the overall steam inthefront part of the machine.
This systemassures3mainadvantages:
•About 30% reduced steam consumption
•About 30-40% reduced ureaconcentrationin the printing paste
•Reduction of treatment timeand consequently productivity growth.
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