The Plastics industry is dominated by two major categories. In an extruder the processed plastic is pressed thru a nozzle into a profiled die.
The extruder gearbox is subject to high torques as well as high radial and axial loads. Injection molding machines are used for the production of parts in large quantities. The screw feed and the linear bearings must be insensitive to heat and vibration and have high basic static and dynamic load ratings.
The demand for plastic parts is growing in industries ranging from consumer goods to medical devices. The plastics industry requires the conversion of raw materials into finished products.
After molding, additional processes may be required to complete the product.To meet the demand, plastics industry manufacturers are looking for ways to increase the output and productivity of plastic extruders and extruder gearboxes without sacrificing quality. To do this, the right bearings must be used.
What are the bearings commonly used in the plastics processing industry?
The plastics industry is dominated by two main categories of products that require extruders and molding machines. Extruders feed treated plastics through nozzles into treated molds. The gearboxes of extruders are subjected to high torque as well as high radial and axial loads.
High volume production of parts for injection molding machines requires screw feed and linear bearings that are insensitive to heat and vibration and have high basic static and dynamic load ratings.
Common bearings used for plastics processing in the extrusion or molding industry include:
Rod end spherical bearings
Thrust ball bearings
Common applications of bearing types in the plastics industry
Electric extrusion molding machines are more accurate, cleaner and consume less energy. They also put bearings in harsher environments.
Some of the conditions that force bearings to work harder include low lubrication, poor melting conditions and low heat generation.
Bearings used in the plastics processing and molding industry must be able to withstand heavy and dynamic peak loads, high rigidity and high heat.
Common applications for these bearing types can be found in these extruder parts:
- Injection cylinders
- Die closing cylinders
- Ejector shafts
- Press cylinders
- Extrusion gearboxes