Twin-Screw Extruders
B&P Littleford’s twin-screw extruders are the industry’s best in class compounding machines. B&P Littleford’s line of twin-screw extruders are expertly engineered, skillfully constructed, and rigidly tested to handle the most challenging and demanding industrial applications that require kneading, dispersive mixing, distributive mixing, and reactive extrusion.
B&P Littleford’s twin-screw machines can be used in the polymer, chemical, and food industries for mixing a wide variety of consumer products, including:
- Adhesives
- Sealants
- Mastics
- Putties
- Soaps
- Detergents
- Toner
- Plastics
- Food & feed products
- Cellulose pulps
- Chemicals
Twin Screw Extruders Features
All B&P Littleford twin-screw extruders – the BP, CT, and Specialty - have two intermeshing, co-rotating screws mounted on splined shafts in a closed barrel. The screws are tight and self-wiping, which eliminates stagnant zones over the entire length of the process section. This results in high efficiency and perfect self-cleaning.
Sized to operate for small-scale runs in the lab to large-scale manufacturing.
B&P Littleford’s line of twin-screw machines also feature:
- Modular segmented barrel sections
- Various sized screws for maximum flexibility
- Specially adapted upstream equipment for feeding
- Touch display process control system that regulates and monitor the mixing process in real time
- Productive - 30% greater intake capacity over traditional extruders
- Consistent performance
- Easy to maintain and clean
- Can use patented XLT (extra low temperature) discharge for enhanced pumping efficiency
Providing the Product You Need
B&P Littleford’s series of high-performing, low-maintenance twin-screw extruders and compounding machines deliver the power and precision you require for high-quality compounding and mixing.
BP Twin Screw
The BP series extruders have larger free volume per unit length for a given diameter twin screw extrusion system. Owing to their inherent deeper channel screw geometry, the twin screw machines are characterized by narrow residence time distribution, high rate of melt surface renewal, low gas speeds and low shear energy input. They are therefore widely used for highly filled compounds, TPE preparation, and in the reaction, concentration and residual degassing of various polymers.
- 5D segmented standard barrel design
- Optimum performance
- Flexible
- Energy efficiency
- Ease of feeding
- Clam-shell opening optional
- XLT design optional
CT Twin Screw
B&P Littleford’s CT series extruders are engineering work horses for high torque, high speed compounding applications such as alloying, filling, mixing, reinforcing, and compounding of masterbatches and color concentrates.
Designed specifically for the high-torque, high-speed demands of thermoplastic compounding applications, the CT Series twin screw compounder features modular, sectioned barrels and screws for easy adaptation to your processing and mixing demands.
- Enhanced torque capability
- Durable, corrosion-resistant segmented barrels and screws
- Electrically heated barrels with internal cooling for precise temperature control
- Wide range of configuration options and supporting ancillary equipment such as side feeders, vacuum vent stuffers, and customized control systems
- Screw diameters available ranging from 26mm to 133mm
- Cost effective
- 4D segmented standard barrel design
- Consistent
Specialty Twin Screw
B&P Littleford’s Specialty series extruders allow for excellent mixing, optimal degassing, and reliable cooling with high throughput.
B&P Littleford’s decades of experience in mixing, outstanding engineering, and construction skills come to the forefront in execution of its Specialty series extruders. This technology is setting new standards in melt devolatilization, and in the manufacture of various polymers, compounds and chemicals.
- Robust construction
- Easy to maintain
- Modular construction for enhanced process flexibility.
- 5D segmented standard barrel design
- Customized to handle unconventional processes
- Clam-shell opening optional
- XLT design optional
BP Twin Screw
B&P Littleford’s sustained focus on offering proven compounding and mixing technology that is reliable, flexible to operate, and easy to maintain resulted in the enhanced BP series extruders.
CT Twin Screw
B&P Littleford’s CT series extruders are engineering work horses for high torque, high speed compounding applications.
Specialty Twin Screw
B&P Littleford’s Specialty series extruders allow for excellent mixing, optimal degassing, and reliable cooling with high throughput.
Types of Twin Screw Extruders Offered:
|
|
BP Series |
CT Series |
Specialty |
|
OD/ID Ratio |
1.76 High Free Volume, Moderate Shear |
1.55 Medium Free Volume, High Shear |
1.76 High Free Volume, Low Shear |
|
Specific torque (Nm/cm3) |
7 – 14 |
11.5 – 13.7 |
6 – 13 |
|
Barrel Diameter |
19, 30, 40, 50, 65, 80, 100, 125, 160 |
26, 40, 58, 70, 92, 133 |
30-160 |
|
Barrel Design |
5D segmented standard, Clam-shell opening optional, XLT design (option) |
4D segmented standard |
5D segmented standard, Clam-shell opening optional, XLT design (option) |
|
Highlights |
Optimum performance and flexibility Energy efficiency Ease of feeding |
Proven capability Consistent performance |
Modular construction Customized to handle unconventional processes |
Disclaimer: Due to continuous development, actual parameters may differ slightly from those mentioned in the above table.
Twin Screw Extruder Features
Our extruders are configured to help you innovate, maximize and lead. All B&P Littleford twin-screw extruders are equipped with closely intermeshing self-wiping co-rotating screws for mixing. Modular segmented barrel sections and various types of screw elements offer maximum flexibility and cost effectiveness. Specially adapted upstream equipment for feeding and downstream equipment for pelletizing after mixing further expand the extruders into complete systems. We offer extruders in sizes ranging from those suitable for lab scale testing, to pilot and small production runs, to large-scale manufacturing.
Process Control System Features
B&P Littleford’s process control system provides visualization functions to regulate and monitor the mixing process in real time. The system is a clearly arranged touch display and membrane keyboard that allows for:
- Failsafe interlocking
- Large view of selectable running mixing data using trends representation
- Fault message system with visual representation and archiving
- Convenient operating help in clear text
- Graphic and tabular representation
- Multi-step login
- Language change-over
- Recipe management of all process parameters
The control system can also be tailored to integrate the upstream and downstream components and provide seamless control of the entire line for enhanced operational efficiency.
Sample Applications
| Industry | Product |
| Consumer Products | Adhesives, Sealants, Mastics, Putties, Soaps, Detergents, Toner |
| Plastic | Powder Coating, Masterbatch, Color Concentrate, Filled Thermoplastics, BMC, Hot Melt Adhesives, Reinforced Thermoplastics, TPE, Silicone, Silicone Compounds, Fiber Reinforced Compounds |
Comprehensive Solutions
B&P Littleford offers a complementary range of ancillary equipment as well as customized control system integration to provide you with a comprehensive and optimized turnkey solution. Our coherent design, planning, and execution of the entire compounding and mixing system pays off for you through system components that are harmonized to each other. Contact us today for details on how we can help with running trials at our Tech Center in Saginaw, MI or helping you design your next process line.
Delivering the Service You Deserve
B&P Littleford designs, develops, and delivers a wide range of mixing, drying, compounding, reacting, extracting and centrifugal separation equipment for many different manufacturing applications.
- More than 100 years of industry experience
- Quality parts and service
- Professional, knowledgeable staff
- Top-notch testing facilities
Frequently Asked Questions
What is extrusion?
Extrusion transforms viscous substances into high-quality structured products by accurately controlling processing conditions. Raw materials can be solids (powders, granulates, flours), liquids, slurries, and even gases. Once extruded, these materials become plastics compounds, chemically modified polymers, textured food and feed products, cellulose pulps, and other products. B&P Littleford’s twin screw extruders can transport, compress, mix, cook, shear, heat, cool, pump, and shape with a high degree of flexibility.
What is a twin screw extruder?
A twin screw extruder is a machine consisting of two intermeshing, co-rotating screws mounted on splined shafts in a closed barrel. The screws are tight and self-wiping, which eliminates stagnant zones over the entire length of the process section. This results in high efficiency and perfect self-cleaning. Twin screw extruders can be used in polymer, chemical, and food industries for mixing a variety of consumer products like:
- Adhesives
- Sealants
- Mastics
- Soaps/Detergents
- Plastics
- Chemicals
What is the difference between single screw and twin screw extruders?
A single screw extruder are single screw machines, while twin screw extruders, as the name implies, have two screws. In single screw extruders, the granular materials stay longer in the extruder and slow production time. Twin screw extruders offer the following advantages:
- Lower energy use
- Excellent compounding ability
- Easy material feeding
- Excellent exhaust ability
What is a twin screw extruder's purpose?
Extrudes are used to extrude viscous substances into high-quality structured products by accurately controlling processing conditions. Once extruded, these materials become plastics compounds, chemically modified polymers, textured food and feed products, cellulose pulps, and other products.
BP Twin Screw
B&P Littleford’s sustained focus on offering proven compounding and mixing technology that is reliable, flexible to operate, and easy to maintain resulted in the enhanced BP series extruders.
CT Twin Screw
B&P Littleford’s CT series extruders are engineering work horses for high torque, high speed compounding applications.
Specialty Twin Screw
B&P Littleford’s Specialty series extruders allow for excellent mixing, optimal degassing, and reliable cooling with high throughput.