Compounding
In compounding, various materials (polymers, additives, etc.) are mixed and melted—generally in an extruder of some type—then pelletized. Most compounding extruders purchased nowadays are of the twin-screw corotating/intermeshing variety, though counterrotating twins are used for some applications. Compounding extrusion lines are typically equipped with gravimetric feeding systems that dose materials into the extruders at very specific rates. In certain applications, extruders are equipped with vent ports that pull unwanted moisture and other volatiles from the polymer stream.
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ESSENTIAL READING
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How to Configure Your Twin-Screw Barrel Layout
In twin-screw compounding, most engineers recognize the benefits of being able to configure screw elements. Here’s what you need to know about sequencing barrel sections.
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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.
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How to Configure Your Twin-Screw Extruder for Mixing: Part 5
Understand the differences between distributive and dispersive mixing, and how you can promote one or the other in your screw design.
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How to Configure Your Twin-Screw Extruder: Part 3
The melting mechanism in a twin-screw extruder is quite different from that of a single screw. Design of the melting section affects how the material is melted, as well as melt temperature and quality.
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How to Configure Your Twin-Screw Extruder -- Part 2
Follow these tips to configure your twin-screw elements to promote feeding and solids conveying.
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Improving Twin-Screw Compounding of Reinforced Polyolefins
Compounders face a number of processing challenges when incorporating a high loading of low-bulk-density mineral filler into polyolefins. Here are some possible solutions.
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Latest Compounding News And Updates
Geon Buys Medical Compounder Foster
Move intended to broaden GEON’s portfolio in the medical market.
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Dual-Shaft Mixer for Robust Industrial Mixing
Units are engineered for wide-ranging densities and viscosities up to several hundred thousand centipoise.
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Fixed Tank Dual Shaft Mixer/Pressure Reactor
This mixer is said to be well suited for processes that require meticulous control over mixing, temperature and pressure in a compact and portable module.
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Compact Extruder for High-Output Compounding, Recycling
Sleek, flexible machine can process PET up to 6 tons per hour.
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Versatile, Cost-Effective High Solids Mixer
PLC controls allow operators to program and run recipes based on speed, time and hydraulic lift raise/lower cycles.
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Farrel Pomini, Lummus Team on Pyrolysis Technology
Mixer’s novel capabilities are said to be the key to success of partnership developing pyrolysis technology.
Read MoreFeatured Posts
Understanding 'Boundary Conditions' in Twin-Screw Compounding
In twin-screw compounding, the objective is generally to produce the highest quality product at the maximum strand. But sometimes there are operating parameters that prevent this objective from being realized.
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How to Configure Your Twin-Screw Barrel Layout
In twin-screw compounding, most engineers recognize the benefits of being able to configure screw elements. Here’s what you need to know about sequencing barrel sections.
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Research Deems Bioplastics, Wood Pulp a Sustainable, Economic Alternative for Rigid Packaging
Farrel Pomini and FPInnovations produce biodegradable compound for molding, extrusion and thermoforming applications.
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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.
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Sirmax Adapts Integrated Recycling Approach to US Supply Conditions
Integrating compounding and recycling to leverage untapped postindustrial recycling feedstocks.
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Small Batches, Big Success
With no minimum order and an impeccable record of on-time delivery, Precision Color Compounds is becoming a force in the color masterbatch ´óÏó´«Ã½.
Read MoreFAQ: Compounding
How can I optimize my twin-screw compounding process?
We identify problems in compounding as “chronic” if the results are the same every time a particular formulation is run. For these problems, the treatment requires redesigning the screw configuration or modifying the compounding process. This is the only way to cure such problems.
Many new players have emerged in the biopolymer space with new materials and many new formulations. Co-rotating twin-screw extruders provide excellent material mixing capabilities for all polymers, including biopolymers. You should consider your machinery supplier as a development partner to achieve your goals in the areas of melt and mix quality, production rates, and other parameters, regardless of formulation. Make sure your machinery supplier has the facilities and the know-how to help you test material formulations and improve your processes.
Pelletizers are essential components in resin manufacture, compounding, masterbatch production, and recycling. A high-volume system that is appropriate for a polymerization plant will be very different from one that suits the needs of a toll compounder. One that can produce micropellets for use in masterbatch may not be the best choice for processing post-consumer regrind. Here are some different types of pelletizers.
- UNDERWATER PELLETIZERS
- WATERRING PELLETIZERS
- STRAND PELLETIZERS
Compounding Supplier Categories
- Rebuilt Screws or Barrels
- Blenders (non-intensive)
- Automation/Systems Integration
- Web Winders, Unwinds, Rewinds
- Single-screw Extruders
- Recycling--Purchasing Scrap or Waste Plastics
- Technical and Trade Associations
- Custom Compounding, Formulating--Thermoplastics
- Barrier Surface Treatment
- Liquid Mixers
- Plastics Trade Shows/Conferences
- Machine Alignment Services
- Slot Orifice Coaters
- Machinery Rebuilding
- Sheet Take-off Systems
- Film Take-off Systems
- Web Brakes, Clutches, Chucks
- Extrusion Dies
- Training Programs in Plastics
- Shipping & Logistics
- R&D, Training Institutes
- Web Inspection Systems
- Rebuilt Motors and Drives
- Pipe Take-off Systems
- Web Guides, Edge Detectors
- Wire and Cable Take-off Systems
- Prototyping Services
- Pipe Thickness Measuring Equipment
- Roll Coaters
- Mold/Tooling Simulation and Analysis Services
- Curtain Coaters
- Custom Machine Builders
- Custom Size-reduction (Grinding) Services
- Profiles, Tubing, Hose Take-off Systems
- Consultants - Design, Manufacturing, Purchasing
- Plastic Lumber Extrusion/Molding Systems
- Web Slitter/Rewinders
- Part/Mold Inspection or Digitizing
- Knife Coaters
- Materials Testing Services
- Film, Sheet, Coated Web Thickness Measuring Equipment
- Hydraulic Oil Filtering/Reclaim Service
- Web Tension Controls
- Motionless Mixers
- Publishers of Plastics Information (Books, Reports, CDs)
- Mold Texturing, Tool Engraving
- Intensive Nonfluxing Mixers
- Multiple-screw Extruders
- Web Cleaning Equipment
- Machine Installation Services
- Hard Facing, Surface Treating of Tooling, Equipment
- Mold/Tooling Design Services
- Coextrusion Dies, Feedblocks
- Web Slitters
- Business Services for Plastics (Finance, Insurance, Leasing)
- Plasma Coating Systems
- Ram Extruders
- Intensive Fluxing (melting) Mixers
- Monofilament/Multifilament Take-Off Systems
- Radiation Processing Services
- Machine Maintenance Services
- Rotary Screwless Extruders
- Used Molds
- Used Machinery
- Environmental Monitoring and Analysis
- Equipment Cleaning Services
- Custom Decorating/Finishing Services
- Profiles, Tubing, Wire Thickness Measuring Equipment
- Tumblers
- Scanning & Metrology Services
- Roll Mills