A Study on Screen Changer of Extruder
There are impurities in most of the plastic materials, but they can be cleaned effectively by a screen changer, which is installed on the back of an extruder, and it is a kind of honey net, sharing the same diameter of the barrel for extrusion machine.
Generally speaking,a screen changer is composed of different nets. The net inside can filter the smallest solid particles from the stream of melt; while the outside coarse mesh can prevent larger particles from entering the dense inner net.
In order to resist the force due to melt flow, there is a round steel plate, which is called fender, imbedded in the groove of the end of an extruder' s barrel.
Please remove the down stream equipment to change the blocked mesh with a new one, and reinstall the new mesh onto the production line.
Screen Changer
It is unnecessary to stop working with the way above; at the same time it can dispense much labor. As per the design, there are two main types:interchangeable type and continuous type.
An interchangeable screen changer owns two identical mesh groups, one of which is installed over the path of melt flow. Another mesh is used when the first group is ineffective; while the used group is changed outside. These two groups of mesh are put on the same steel plate, revolving round the same shaft, or sliding along the guide. The former works based on a lever by manual control; while the latter moves its mesh group by hydraulic pressure from one side to another. A valve is needed in another method to change mesh, so that the melt can flow into a new mesh group from the old one.
Continuous screen changer: it removes the new mesh into melt flow, from which the old one is moved away. The speed of this process can be adjusted according to the amount of impurities automatically. A continuous screen changer enables to get rid of the pressure and temperature change of melt due to the discontinuous operation.
A continuous screen changer is designed based on swivel slide.There are numerous mesh groups lining along a turntable, driven by a wheel machine. When the turntable is moved, the used mesh is removed from melt flow.
Generally speaking,a screen changer is composed of different nets. The net inside can filter the smallest solid particles from the stream of melt; while the outside coarse mesh can prevent larger particles from entering the dense inner net.
In order to resist the force due to melt flow, there is a round steel plate, which is called fender, imbedded in the groove of the end of an extruder' s barrel.
Please remove the down stream equipment to change the blocked mesh with a new one, and reinstall the new mesh onto the production line.
Screen Changer
It is unnecessary to stop working with the way above; at the same time it can dispense much labor. As per the design, there are two main types:interchangeable type and continuous type.
An interchangeable screen changer owns two identical mesh groups, one of which is installed over the path of melt flow. Another mesh is used when the first group is ineffective; while the used group is changed outside. These two groups of mesh are put on the same steel plate, revolving round the same shaft, or sliding along the guide. The former works based on a lever by manual control; while the latter moves its mesh group by hydraulic pressure from one side to another. A valve is needed in another method to change mesh, so that the melt can flow into a new mesh group from the old one.
Continuous screen changer: it removes the new mesh into melt flow, from which the old one is moved away. The speed of this process can be adjusted according to the amount of impurities automatically. A continuous screen changer enables to get rid of the pressure and temperature change of melt due to the discontinuous operation.
A continuous screen changer is designed based on swivel slide.There are numerous mesh groups lining along a turntable, driven by a wheel machine. When the turntable is moved, the used mesh is removed from melt flow.
