Plastics Extrusion
Extrusion is a continuous process through which parts of a fixed cross-sectional profile are made. Material is fed through a hopper into an extruder, essentially a rotating screw surrounded by a heated barrel, where it is mixed, melted and pumped through a die. The die gives the part its shape. Types include film extrusion, sheet extrusion, pipe, profile and tubing extrusion.
Narrow Your Extrusion Search
ESSENTIAL READING
VIEW ALL
How to Select the Right Cooling Stack for Sheet
First, remember there is no universal cooling-roll stack. And be sure to take into account the specific heat of the polymer you are processing.
Read More
Why Are There No 'Universal' Screws for All Polymers?
There’s a simple answer: Because all plastics are not the same.
Read More
What to Know About Your Materials When Choosing a Feeder
Feeder performance is crucial to operating extrusion and compounding lines. And consistent, reliable feeding depends in large part on selecting a feeder compatible with the materials and additives you intend to process. Follow these tips to analyze your feeder requirements.
Read More
Understanding Melting in Single-Screw Extruders
You can better visualize the melting process by “flipping” the observation point so the barrel appears to be turning clockwise around a stationary screw.
Read More
Follow These Tips to Fire Up Your Cold Blown Film Line
Firing up a cold blown-film line after a shutdown involves multiple pieces of equipment that all interact. Here’s a look at those components individually and some best practices on how to get your line up and running as quickly and safely as possible.
Read More
How to Select the Right Tooling for Pipe Extrusion
In pipe extrusion, selecting or building a complementary set of tooling often poses challenges due to a range of qualitative factors. Here’s some guidance to help you out.
Read More
Latest Extrusion News And Updates
LG, Reifenhauser Combine on MDO Push
Resin and machinery companies also aim to look for further downgauging opportunities.
Read More
Ether-Based TPUs for Broad Range of Industry Applications
BASF’s Elastollan 1400 TPU series can be used for applications ranging from railway pads, hoses and profiles to show soles.
Read More
2025 Extrusion Conference Shifts to Standalone Event in Boston
The annual technical conference organized by Plastics Technology magazine was scheduled to co-locate with the PTXPO trade show next March. Both events will now occur independently.
Read More
‘Revolutionary’ Extrudable PPS for Sustainable Piping
Syensqo’s Ryton PPS XE-5000NA boasts exceptional chemical and permeation resistance.
Read More
Insight Polymers & Compounding Unveils New Conductive Products Line
The new conductive products line will also be produced for injection molding and extrusion.
Read MoreNew Owners for Alpha Marathon
After bankruptcy, new group purchases intellectual property and forms Alpha Marathon Film Extrusion Technologies.
Read More
Featured Posts
New Screw Boosts Mixing, Enhances Polymer Properties
Device mixes at the ‘molecular level,’ inventor says, to boost mechanicals and in some cases make pre-drying redundant.
Read More
Leading Cast Film Processor Adding Blown Film Capacity
Malpack adds two multilayer blown film lines for agricultural, stretch hood and shrink films.
Read More
What's Restricting My Output Rate?
In a single-screw extruder, it could be an improperly designed barrier flighted entry section. Here’s why.
Read More
Materials Suppliers Team on PFAS-Free Solutions
Baerlocher PFAS-fee process aid passes muster in resin manufacturer’s testing on production-sized blown film line.
Read More
Making Gains in the Drain Game
AWD blends extrusion and thermoforming technologies with plenty of home-brewed equipment and processes to keep water away from where it isn’t supposed to be.
Read More
Part 2 Medical Tubing: Use Simulation to Troubleshoot, Optimize Processing & Dies
Simulation can determine whether a die has regions of low shear rate and shear stress on the metal surface where the polymer would ultimately degrade, and can help processors design dies better suited for their projects.
Read More
FAQ: Extrusion
However, there are actual limits on increasing output as L/D is increased. Usually these limits are due to the inability of the feed section to deliver more polymer. On smaller-diameter screws, that limit often is determined by screw strength. On small screws you can only go so deep in screw channels before the screw is over torqued and fails. On larger extruders, the efficiency of feeding decreases as the channels get deeper until there is no further increase in output.
There are four main things to consider in selecting the correct stack for your application: the overall cooling capacity, the products to be processed, the mechanical capability, and the rolls’ internal design. Considering just the cooling capacity, the top roll is there to set the sheet thickness as well as its uniformity.
One of the most useful evaluations is the relatively simple calculation of drag flow. Drag flow is simply half the volume of one turn of the metering section per second at a specific screw rpm, which, when multiplied by a units conversion and the melt specific gravity of the polymer, is a very accurate approximation of the output in lb/hr at no head pressure.
Extrusion Supplier Categories
- Web Winders, Unwinds, Rewinds
- Single-screw Extruders
- Saws
- Orientation and Tentering Equipment (for Webs)
- Pipe Corrugators
- Slot Orifice Coaters
- Extruder Screens, Screen Packs, Screen Changers, Breaker Plates, Other Melt-Filtration Equipment
- Sheet Take-off Systems
- Film Take-off Systems
- Web Brakes, Clutches, Chucks
- Extrusion Dies
- Pipe Bellers
- Web Inspection Systems
- Pipe Take-off Systems
- Web Guides, Edge Detectors
- Wire and Cable Take-off Systems
- Pipe Thickness Measuring Equipment
- Roll Coaters
- Dispensing Equipment for Reactive Resin Systems
- Melt Pumps for Extrusion
- Curtain Coaters
- Profiles, Tubing, Hose Take-off Systems
- Calenders
- Cutoff Equipment
- Plastic Lumber Extrusion/Molding Systems
- Web Slitter/Rewinders
- Knife Coaters
- Film, Sheet, Coated Web Thickness Measuring Equipment
- Web Tension Controls
- Multiple-screw Extruders
- Web Cleaning Equipment
- Coextrusion Dies, Feedblocks
- Web Slitters
- Plasma Coating Systems
- Ram Extruders
- Air Knife Equipment
- Monofilament/Multifilament Take-Off Systems
- Rotary Screwless Extruders
- Pelletizers
- Solution Casting Equipment (for Film)
- Air Rings and Internal Bubble Cooling Units
- Profiles, Tubing, Wire Thickness Measuring Equipment
