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Continuous Backflush Screen Changer (CSC/BF)

Patent Pending

Continuous Backflush Screen Changer

Features Include

  • • Guaranteed leak-free operation to 10,000 psi
  • • Breaker plate open area largest in the industry
  • • All parts manufactured to ISO-9002 standards
  • • No seals or contact parts
  • • Rugged design provides resilience to wear
  • • Minimum pressure drop
  • • Continuous operation means no shut down
  • • Process temperatures to 700° F
Continuous Backflush Screen Changer

Benefits

  • Screen life increased as many as 25 times or more
  • Increased output due to lower backpressure
  • Design allows for less frequent screen changers without interrupting material flow
  • Eliminates line shutdown thus increasing production
  • Absence of wear surfaces allows us to provide a five year warranty against melt leaks
  • No maintenance or seals to replace
  • Easier access and less interference for the operator
  • Quick delivery time and return on investment

The Continuous Backflush Screen Changer performs much like the Continuous Screen Changer design. Polymer is divided into four streams, all being filtered in the top and bottom piston. Unlike the CSC design, the backflush unit has two filtration cavities in each piston, allowing for twice the filtration of the comparable sized CSC design. The most unique aspect of the backflush CSC/BF is the capability of recycling or maximizing screen life while in the melt flow. When upstream pressure rises due to a high contaminant level, the PLC control automatically actuates each piston to its backflush position, allowing pressure to push contaminants off the dirty screenpack. Contaminants are purged out of ports in the bottom of the housing into a drip pan. Once the backflush sequence takes place, the recycled screens are returned to the home position until the sequence takes place again. The number of backflush sequences varies from process to process before a screen change is required; however increased screen life of 25 times or more is common.

Applications

  • Sheet
  • Coating
  • Pipe and profile
  • Compounding
  • Wire and cable
  • Tubing
  • Lab lines
  • Textiles (fibers and nonwovens)
  • EVA, hot melt adhesive and PSA
  • Pelletizing (strands and underwater)
  • Recycling of most polymers
  • Highly contaminated polymers
  • Blown film and cast film
  • FPVC, corrosive and degradable materials
Technical Data For Our Continuous Backflush Screen Changer
Model Extruder Output Screen Diameter Filter Area Weight
CSC/BF (lbs/hr) | (kg/hr) (in) | (mm) (in²) | (cm²) (lbs) | (kg)
116 900-2,400 | 400-1,090 4.58 | 116.3 4x16.47 | 4x106.26 1,270 | 576
148 1,750-4,400 | 794-1,996 5.84 | 148.3 4x26.76 | 4x172.64 3,750 | 1,701
176 3,100-6,600 | 1,406-2,994 6.94 | 176.3 4x37.83 | 4x244.06 2,620 | 1,188
200 3,750-8,400 | 1,700-3,810 7.89 | 200.3 4x48.73 | 4x314.38 3,430 | 1,556
230 4,850-11,500 | 2,200-5,216 9.07 | 230.3 4x64.53 | 4x416.32 8,975 | 4,071
250 10,600-19,400 | 4,808-8,800 9.85 | 250.3 4x76.08 | 4x490.84 10,400 | 4,853

For larger sizes and special applications contact our PSI sales office

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