newest twin screw extruder for plastic
machines with often have barrel venting. The barrels and screws of these machines are not modular so they may need to be changed for your specific application. Air and water cooling are both common.
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:
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.
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.
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.
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.
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.
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.
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.
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:
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:
Co-rotating twin-screw extruder : Due to the co-rotating twin-screw has the opposite speed at the meshing point, one screw pulls the material into the meshing gap, and the other screw pushes the material out of the gap, resulting in material from one screw turns to the other screw and advances in a "∞" shape. Since the gap of the meshing zone is small, the speed of the meshing screw and the groove are opposite in direction, so that the cutting speed is high, and the self-cleaning effect is good, that is, any accumulated material adhering to the screw can be scraped off, thereby The residence time of the material is very short, so the twin screw extruder is mainly used for compounding and pelletizing .
This TSE-75B twin screw extruder is Haisi"s 2018 lateset design. From the gearbox, screw elements to the assembling of the extruder is all done by ourselves.
Twin screw extruder is widely used for plastic modification, plastic compounding, masterbatch making, as well as hard plastic recycling, such as PET bottles, TPU wastes, ABS shield, etc.
Twin Screw Extrusion for Efficient Energy AdditionCoperion’s twin screw extruder technology is particularly well suited for chemical recycling of plastics. After post-consumer waste, either shredded or compacted, is reliably added to the extruder’s process section by the Coperion K-Tron feeder, a great deal of mechanical energy is introduced into the material in shortest time thanks to the continuous surface renewal as well as intensive dispersion and shearing along the twin screws.
Further materials, such as catalysts, can be added and mixed in as needed. In some cases, residual water or chlorides from PVC are introduced into the extruder in minute quantities along with the plastic waste. Both are reliably extracted via vacuum devolatilization on the extruder"s process section.
Twin screw extruders possess numerous advantages that are especially beneficial in chemical recycling. The technology covers a broad range of throughputs. On larger ZSK extrusion machines, throughputs of up to 20 t/h can be realized using this process. Polymers of various viscosities are reliably plastified thanks to the highly effective mode of operation of the twin screws. Plastic energy dissipation takes place in no time. When needed, corrosion and wear protection of all product-contact parts within the process section can assure long extruder lifetime even when processing very aggressive materials.
Reclamation of Raw MaterialsWithin the reactor, the melt, which was previously heated to up to 350°C in the twin screw extruder, is further heated. At up to 500°C pyrolysis of the polymers takes place, the splitting of polymer chains into shorter units in an oxygen-free environment. The pyrolysis of polymers utilizes the random scission mechanism, where free radicals are generated. At the same time, chain reactions are initiated which lead to cracking polymers into a broad mixture of hydrocarbons in liquid and gaseous phase. The most important factors for driving this process are residence time, temperature, and the type of pyrolysis agent.
The Coperion ZSK twin screw extruder will be part of a new setup for chemical recycling at Ghent University. It will be among others coupled to a vortex reactor; thus the molten plastic will flow directly into the reactor. Different technologies for the conversion of plastic waste to chemicals may be applied like catalytic pyrolysis and thermo-chemical processing (cracking).
“We are proud to be able to support the renowned Ghent University with our expertise and technology in their research and development activities involving chemical recycling. We see chemical recycling as a trailblazing process for reclaiming raw materials from mixed plastic waste. With this process we will succeed at preserving our valuable resources in the long term. As soon as the recycling system featuring the ZSK twin screw extruder is in operation at the Ghent University, it will also be available to our customers for testing,” said Jochen Schofer, Business Segment Manager for Recycling & Direct Extrusion at Coperion.
The ZSK Mc18 high performance twin screw extruder is a superlative product. With its torque of 18 Nm/cm3, it has made a name for itself on the market as a throughput champion for products with high torque requirement such as engineering plastics. The 30% increase in torque compared to the predecessor extruder model ZSK Mc PLUS leads to increases in throughput of up to 100%. Therefore the ZSK Mc18 twin screw extruder ensures production with maximum economic efficiency. The optimum price/performance ratio, the extremely energy-efficient operation, the wide range of applications, and the associated high level of flexibility of the machine are additional advantages.
With its Do/Di of 1.55, the ZSK Mc18 strikes just the right balance. It has proven itself in the processing of products with high torque requirements and enables reliable scale-up within the entire Mc18 twin screw extruder series. In addition, it is possible to scale-up and modernize the ZSK Mc PLUS series to the Mc18 series.
The new easy design of the ZS-B and ZS-EG permits much faster dismantling from the ZSK extruder process section and the twin screws can be changed very simple. Time for cleaning e.g. for recipe changes decreases obviously.
The gearbox lantern of Coperion ZSK twin screw extruders can be optionally equipped with an electronically secured maintenance opening. As soon as the screw shafts come to a complete stop, service personnel can open the gearbox lantern without tools, guaranteeing secure, easier access to the screw shaft coupling.
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