Presentation on Underwater Pelletizing System

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Presentation on Underwater Pelletizing
System
Perfect Solution for Specific
Applications
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Neoplast - A legacy of experience

• Since 40 years, Neoplast is known as the reliable
  and efficient partner for the plastics processing
  industry worldwide and its committed to expand
  this legacy, by continuously developing new
  products and processes.
• Recently, Neoplast has added a feather in its
  success saga by introducing an Underwater
  Pelletizing System developed after substantial
  research and extensive field trials.

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Neoplast - A legacy of experience

• Neoplast Underwater pelletizer are designed to
  produce pellets from a wide range of
  thermoplastics and elastomers, partially filled
  plastics, virgin resins, and polymers having very
  low viscosity.
• Neoplast UWPS incorporates numerous processing
  and mechanical innovations, which assure quality
  pellet output, lower energy cost and simplified
  maintenance.

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Why Underwater Pelletizer !!

• In plastic processing industry mainly
  three types of pelletizer are used
• Strand pelletizer
• Water Ring Pelletizer
• Underwater Pelletizer

• In Strand Pelletizing System,
  
  the pellets are not consistent in dimensions and
  having inclination to carry moisture. The wastage
  is also very high.
• In water Ring Pelletizing System,
  the
  material tends to smear over the die plate and
  cutting blades, due to dry cutting at the die
  face.

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Why Underwater Pelletizer !!

• In Underwater Pelletizing System,
• The molten polymer emerges from the Die holes,
  cut into pellets by the rotating blades, under
  controlled temperature of water.

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Why Underwater Pelletizing System !!

• In underwater pelletizing system, the cut pellet
  is immediately quenched and solidified. In turn,
  the water transports the pellets to a centrifugal
  dryer where pellets are dried and discharged to
  the classifier.
• The process water coming out from the drier is
  passed through a fines removal screen (FRS) to
  make the system free from impurities, which in
  turn pressurized, temperature regulated and
  returned to the pelletizer by the tempered water
  system.
• The process water is contained in a closed loop
  so there is minimal water loss and very little
  housekeeping involved.

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Die Plate

• The design of the die plate has a major impact
  on the shape, quality and uniformity of the
  pellets. So, Die and cutter blades are made of
  specially treated material to ensure long life.
• All water contact parts made from SS 304 to
  ensure corrosion contamination free end
  products.
• Ideal horizontal melt flow hence no dead areas.
  Moreover, simple access to die plate and cutter
  hub.
• Replacement possible in lowest down time.
• With advantage of proven pelletizer design, we
  guarantee for the best quality of pellets,
  lowest energy costs and simplified maintenance.

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Spring Loaded Cutter

• Spring-loaded cutter to adjust blades against the
  die face.
• Different springs are provided in order to
  properly match - blade, die and polymer
  combinations.
• The MOC of the blade is S.S. 304 with 4 or 6
  spokes cutter hub.
• Hardness of the blade is 45 - 50 HRC.
• The cutter blade RPM can be 100 to 3600 easily
  controlled by AC variable frequency drive.

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Tempered Water System (TWS)

• The tempered water system is the internal
  conveying system of the pelletizing process.
• As a rule, the tempered water system is made up
  of the following main components
• Centrifugal Dryer with
• Agglomerate catcher and exhaust fan
• Water tank with heater
• Heat exchanger
• As an option, a fines removal sieve and a pellet
  diverter valve may be integrated.

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Centrifugal Dryer with Agglomerate catcher

• The Centrifugal Dryer is provided with
  Agglomerate catcher, Exhaust blower Diverter
  Valve
• A countercurrent airflow generated by an external
  fan removes residual surface moisture produces
  a slight vacuum to remove humid air from pellets.
  The residual surface moisture (PPM) can be
  reduced to 0.05 or less by virtue of specially
  developed dryer design.
• An agglomerate catcher is included to remove
  oversized lumps of polymer before they enter the
  dryer. Agglomerates fall into the fines removal
  waste tray from the slurry inlet.

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Rotor of Centrifugal Dryer

• The Centrifugal drier rotor is rotated at the
  speed of 1500 rpm and with the rotor lifter
  elements design, the pellets are thrown against
  the screens. The centrifugal force moves them
  upward following a helical path.
• While the water is separated through the screens,
  the pellets are continuously conveyed to the
  upper section of the dryer where they emerge at
  the pellet outlet.
• Rotor is dynamically balanced and hence vibration
  free performance.
• All water contact parts SS 304.
• Hinged doors, leak proof screens, pellet
  free rotors and precisely fabricated components
  are some of the standard features.

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Heat Exchanger with
water tank

• Heat exchanger of adequate capacity with
  automatic control which ensures a constant and
  desired process water temperature.
• SS water tank with heater temperature
  controller.
• Automatic water level controller with solenoid
  valve digital flow meter.
• Tempered water system is supplied with By-Pass
  line to avoid freezing of die.
• All process ball valves incorporated in the
  system are pneumatically actuated controlled by
  PLC.

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Fines Removal Sieve (FRS)

• A fines removal screen is included for collection
  and disposal of fines particles during process
  run.
• The process water contaminated with particles is
  first collected into a collection chamber then
  flows evenly over curved screen to separate
  collect fines.
• The FRS removes all fine particles higher than
  0.15 mm in size.
• FRS is the neat clean way to collect fines
  impurities from process water.
• Comb type SS construction processes water upto 30
  m3/hr.

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Control Panel

• The Electric Control Panel is precisely pre-wired
  and labeled as per international standard IP 55
  or equivalent easy to plug in at the time of
  installation.
• The cutter blades RPM controlled by AC variable
  frequency inverter drive and soft start up of the
  machine.
• The control panel incorporates PID temp.
  controllers for die plate adaptor, digital Amp
  meter for adopter, die pelletizer drive,
  overload audio-visual alarm to shut down
  extruder.
• PLC is incorporated with pre-programmed process
  interlocks for operators safety.

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Advantages of Underwater
Pelletizer

• Ideal melt distribution
• Direct introduction of the melt into the cooling
  circuit
• Closed water cycle
• Variable pellet size from 0.5 mm to 5 mm
• Safe pelletizing process
• Low downtime low scrap through automation
• Automatic tool readjustment
• Uniform pellets
• Smooth pellet surface
• No product oxidization
• Clean operation

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Underwater Pelletizer system to process
polymers like.

• Polyolefin ( LLDPE, LDPE, HDPE, PP, EPDM )
• Polyvinyl Chloride (PVC)
• Styrene Polymer (PS, SAN, ABS)
• Acrylic resins (PMMA)
• Polycarbonates (PC, PET, PBT, PEN)
• Polyamide (PA 6, PA 66, PA 11, PA 12)
• Thermoplastic Elastomer (TPE-S, TPE-O, TPE-E,
  TPE-A)
• Synthetic resins (Epoxy resin)

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Applications
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