subject: Plastic Extruder Characteristics, Application, Composition And Classification [print this page] Extrusion molding plastic molding processing important method of molding. Most thermoplastics can adopt Plastic Extruder to process.
Extrusion molding has the following characteristics : the production process is continuous, its products are also continuously; the production efficiency is high; the application range is wide, can Pipe Production LineSheet Production Line, bar, sheet, film, filament, wire and cable, as well as hollow products; less investment, fast effect.
Plastic extruder processing process is roughly like this: the plastic is heated up, let a viscous flow state, in the absence of pressurization, makes its way through a certain shape die, a die section with a shape similar to that of the continuum, and after cooling stereotypes, to get the required products.
The extrusion system : mainly by the barrel and a screw rod. Plastic extrusion system plastics into a homogeneous melt, and in the process is formed under pressure, by screw continuous constant pressure, quantitative, fixed temperature extrusion die.
The transmission system: its role is to screw to provide the required torque and rotational speed.
The heating and cooling system: role is through the barrel or screw for heating and cooling, in order to ensure the forming process in the process requirement of temperature range to complete.
The handpiece: molding of the main components, the molten plastic through the die to obtain certain geometric cross section size.
The shaping device : effect is from the head out of the strip shaped plastic stabilized, and carries on the finishing, in order to get more accurate shape, size and bright surface; usually with cooling and compression methods to achieve their goals.
A cooling device: from the setting device of the plastic which is fully cooled, obtain the final shape and size.
In the distraction device: uniform traction products, and the products the section size of the control, so that the extrusion process stability.
The cutting device: continuous extrusion products is cut into a certain length, width.
As the take-up device : the soft products ( such as film, hose, monofilament and winding up ).
The general will head later this part is called auxiliary; according to the different products, auxiliary equipment can be more different components, more or less.
And the extruder control system: from all kinds of electrical appliances, instruments, an actuating mechanism, can control the Plastic Extrusion Machine host, the auxiliary drive, drive the oil pump, cylinder, click on the cylinder and a variety of other enforcement agencies in accordance with the required power, speed and trajectory, detection, and control of main and auxiliary temperature, pressure, flow, the final realization of the Plastic Extrusion Machine unit of automatic control, the control of products.
Usually more than 1~ 10 of the components of the device known as the extruder.
In two, the extruder classification : with the extruder use increases appeared various types of extruders, have different classification methods.
According to the number of the screw is divided into: single screw extruder, Twin Screw Extruder, twin screw extruder;
The press is divided into: exhaust exhaust type extruder, non exhaust type extrusion machine;
The press screw have : screw extruder, screw extruder;
Following the screw position in space is divided into: horizontal extruder, extruding machine.
