Plastic is broken into tiny pieces into granules using a machine called a plastic shredder. Shredders, as opposed to plastic granulators, are created especially for bigger plastic waste, such as vehicle bumpers, pipes, drums, as well as other objects that are too huge for granulators.

Large plastic objects are put into the shredder throughout the procedure. Blades reduce the plastic to tiny pieces while moving more slowly than a granulator. These fragments are then gathered, cleaned, and processed in recycling & washing facilities before being ground up and then sent to manufacturers.

Shredder Machine

The shredding machine’s design idea is often rather similar. A shaft & sets of blades, a motor, gearing, bearing, & transmission, a hopper, as well as a structure, are all components of any design. The design, which consists of the combination of the shaft & the blade sets, is the most complicated part of the shredder machine since it influences the effectiveness of the device.

Additionally, it needs routine maintenance because of wear & tear from the shredding process. Notably, the shredder machine’s design can feature either a single or double shaft. A variety of blade geometries and shaft configurations/orientations have also been documented, in addition to those other things.

Single and double-shaft shredder machine

The shredder machine’s shaft is equipped with a set of blades & knives to do the cutting. To enhance cutting operations & accelerate the process, a heavy-duty or big shredder machine may need more than one shaft. For something like a small to medium-sized shredding machine, a single-shaft or double-shaft is sufficient.

There are several small- to medium-sized shredding machine designs that have been recorded. For instance, created a double-shafted plastic shredder. The shafts had a spacer between each of the 18 blades. Each blade has three teeth with a 56-degree cutting angle. There was no statement or illustration of how the blades were arranged or oriented on the shaft.

In opposition to one another, the two shafts revolve. To seal the space between the moving blades and to force the plastic into the space, a triangle-shaped projecting device is fastened towards the side of the shredder box.

Blades Geometry

The geometry of the blades utilized in the shredding machine varies. The geometry of the blades in this article refers to the quantity of cutting edges, cutting angle, gripping surface, & cutter blade thickness. If the blades are inadequate, the shredder machine could not be able to shred more difficult things, or it might clog and need to reverse spin direction.

Number of cutting edge

The quantity of cutting edges or teeth changes the point of contact during cutting as well as the way forces are distributed together with the piece, directly impacting how well the machine works. The cutting efficiency was improved by adding more teeth, although this may potentially increase the likelihood of material slipping onto the blade.

 Additionally, the manufacturing and test run supported this. Dual-shaft shredder machines have indeed been utilized with sets of blades with 6 edges. The researchers concluded that having more edges did not improve shredding performance but rather increased the possibility of things skipping and ending up at the top of the cutting blade.

Blades’ gripping surface and cutting angle

The cutting angle, which is the angle between both the hook/teeth & the primary structure of the blade, is another crucial component of a blade. Greater shredding power may be achieved with higher cutting performance because of the bigger gripping area that a larger cutting angle gives.

The cutting angle was not emphasized in the published work. Nevertheless, the shredder blades were frequently utilized with cutting angles between 50° and 80°. The impacts of the cutting angle on the effectiveness of plastic shredding have not been thoroughly studied.

Frequently, the angle was determined by the size of the blade as well as the quantity of cutting edges. To avoid uncut material, the grasping surface must provide enough gripping area for the substance to be shredded.

Orientation blades

Blades mounted on rotator single-shaft and double with gaps between them are used in shredder machines. The shredder typically guides the material to be shredded among two pairs of blades that are positioned beside two parallel axles when it is in operation.

The overlapping radii of the opposing axes are interwoven between each set of blades. Cutting occurs at the point where the two sets of opposing blades meet.