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High Efficiency Single Screw Extruder Machine , Single Screw Extruder

Good quality Plastic Profile Extrusion Machine for sales
Good quality Plastic Profile Extrusion Machine for sales
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High Efficiency Single Screw Extruder Machine , Single Screw Extruder

China High Efficiency Single Screw Extruder Machine , Single Screw Extruder supplier
High Efficiency Single Screw Extruder Machine , Single Screw Extruder supplier High Efficiency Single Screw Extruder Machine , Single Screw Extruder supplier

Large Image :  High Efficiency Single Screw Extruder Machine , Single Screw Extruder

Product Details:

Place of Origin: China
Brand Name: MagStar
Certification: ISO, CE, SGS
Model Number: SJ

Payment & Shipping Terms:

Minimum Order Quantity: 1 set
Price: Negotiable
Packaging Details: PE Film covered and wooden case
Delivery Time: 30 working dayss
Supply Ability: 10 Sets Per Month
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Detailed Product Description
Condition: New Color: Customizable
Name: Plastical Extruder Raw Material: Plastic Pellets
Usage: Plastic Pipe Extrusion Material: PP,PC,PE
Voltage: 380V 50HZ 3Phase(Customized) Power(w): According To The Machine Model
Automatic Grade: Automatic Warranty: 2 Years
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single screw plastic extruder


single screw extrusion machine

SJ Series Plastic Single Screw Extruder Machine


ISO Standard SJ Series Plastic Single Screw Extruder Machine is main part of the core operations in polymer processing and is also a key component in many other processing operations. The foremost goal of a single screw extrusion process is to build pressure in a polymer melt so that it can be extruded through a die or injected into a mold. Most machines are plasticating: they bring in solids in pellet or powder form and melt them as well as building pressure.


Single screw extruder is composed of driven motor, gear reducer box, screw and barrel, casting aluminum heater, cooling blower, hopper and control cabinet. Single screw extruder working principle is as following : When the screw turns, it moves the resin within the hotbarrel. In this way, it reaches the required temperatures as well as mixes thoroughly to form a melt that is homogenous. The pressure which is built up by the single screw extruders then forces the melt from the extruder. It gets out shaped like a die. The whole system has barrier screw that makes sure that the whole resin does not melt in basic extrusion screw.


The following picture shows a cut-away diagram of a simple single screw machine. This diagram shows the arrangement the different parts of the machine. The two units - screw and barrel - interact together to convey the plastic material, melt the material, and then push it through the die.


The screw is rotated at a predetermined speed with the electric motor drive unit and gearbox. Temperature controllers are connected to heating/cooling elements on the barrel to maintain the temperature at the set-point temperatures.


The capability of the screw and barrel assembly to extrude a given material is based on the characteristics or construction of the barrel and screw, the characteristics of the plastics material, and the circumstances under which the system is operated


High Efficiency Single Screw Extruder Machine , Single Screw Extruder




Overview of Single screw extruder


As the name suggests, single-screw extruders have only one screw located inside the cylindrical barrel. They are primarily used for extruding granules and pre-prepared compounds. The single-screw extruder is considered a very basic form of extruder that simply melts and forms the material. Together, they are responsible for conveying the solids, melting and pumping the melt through the die. A typical construction of a single-screw extruder is shown . A polymer, as powder or pellet, is continuously fed from the hopper into the extruder barrel. The heated barrel melts the polymer and transports the material through the die. The screw channel exerts the force on the polymer by the rotating screw while the stationary barrel gives a breaking force to the rotating polymer and makes the polymer slip slightly on the screw surface. The polymer keeps on rotating while the screw continues to rub on the barrel surface, at a slightly lower speed than the screw itself. The slippage of the polymer on the screw surface along the screw channel results in an output rate.


The screw is divided into three sections:
  • Feeding
  • Transition or compression
  • Metering or melting
Each zone has its own special role and thereby it is important to determine the ratio of lengths between the feeding, transition and metering zones of the screw.

During the feeding zone, material in the form of pellets or powder enters the extruder and makes first contact with the screw. The objective of this zone is to convey the material forward to the next zone in the solid state. In order to level out irregularities of feed, several flights of constant depth are provided. On most conventional screws, the feeding zone has a higher capacity than the subsequent transition and metering zones. Thus, it functions in supplying enough material to prevent starving the forward zones.

The depth of the feeding zone is three to five times as deep as the metering zone. The ratio of feed to metering zone flight depth is known as the compression ratio. The region between the feed and the metering zone is called the transition zone. In this zone, the difference in the flight depth causes the pressure to build up and starts compressing the plastic. At this stage, material starts to melt while it is conveyed to the metering zone. The transition may be either gradual or abrupt, depending on the material extruded. The resin should be fully melted into a reasonably uniform melt by the time it gets to the metering zone. The metering zone has the shallowest flight depth and its sole objective is to pump the melt through the die.


Main Technology Paramter of L/D 36:1 Single Screw Extruder


Model SJ65/36 SJ75/36 SJ90/36 SJ120/36
L/D 36:1 36:1 36:1 36:1
Power 90KW 160KW 280KW 355KW
Capacity 220kg/h 450kg/h 800kg/h 1000kg/h


Contact Details
Magstar Machinery Technology Co.Ltd.

Contact Person: Shen

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