Davis-Standard Extrusion Process Development Lab

 

Davis-Standard Extrusion Lab If you are planning to: 

  • expand,
  • improve your process,
  • develop a process for a new product or material,
  • increase throughputs,

the lab resources at Davis-Standard are available to you to help you make an informed decision.

 

 Available Lab Extruders

Smooth Bore  L/D
 2.5-inch (64mm) 24:1 and 30:1
 4.5-inch (114mm)  24:1, 30:1, 34:1
 Groove Feed   L/D
3.5-inch (90mm) 24:1, 30:1, 34:1
Other extruders available for development work in the Technical Center include: 
  • 2.5-inch (64mm) 40:1 L/D high speed extruder
  • 0.75-inch (19mm) 24:1 L/D high temperature corrosion resistant for FEP
  • 24:1 L/D high temperature corrosion resistant for FEP
  • 2.5-inch (64mm) 24:1 and 30:1 L/D, vented and non-vented
  • 3.5-inch (90mm) groove feed 28:1, 33:1, 40:1 L/D configurations
  • 4.5-inch (114mm) 24:1, 30:1, 34:1 L/D vented and non-vented

The pictures above were taken at a lab trial for a local medical tubing manufacturer.

  • Problem: Which extruder size would generate the required throughput using a new material on an existing product.
  • Results: Given a number of trials with different screw designs, it was demonstrated that different screw designs would produce varied throughputs, with the difference being in the quality.
  • So now the decision will be: Which level of quality is acceptable? The answer to that question helps to determine screw design and machine size.
  • This will now be a decision based on test results, instead of a decision based on an educated guess.

Machines are fully instrumented to monitor and record internal barrel conditions
There are over 200 screws and screw extensions available for testing
There is a complete line for medical tubing process development with state of the art downstream equipment available.

The R&D facility at Davis-Standard’s headquarters in Pawcatuck, Connecticut, specializes in feed screw design and development. Staff priorities include:

  • Product development
  • Optimizing turn-key extrusion systems
  • AND this resource is available to end users.

Download a brochure describing the Davis-Standard Tech Center Capabilities

The first step in the extrusion process is melting and delivering plastic, so this is very important. Things you can learn by going through a lab test at Davis-Standard include:

  • Determine the best combination of extruder size, and screw design for your process.
  • Evaluate Groove Feed vs Smooth Bore processing
  • Analyzing screw design can improve product quality directly, and it reletes directly to throughputs.
  • Optimize your extruded product quality with the correct screw.
  • Eliminate or reduce the amount of un-melted plastic or gels with an optimized screw design, rather than attempting to screen them out.
  • Match extruder size, screw design and die in a laboratory environment . Don’t assume the correct mating pieces.
  • Determine the correct L/D. The Davis-Standard lab has machines with bolt on barrel extensions. You can test with with longer and shorter barrels for different L/D ratios.

 

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