Currently, plastics including PP, PS and LDPE can’t be recycled by curbside programs. Usually, they end up getting stuck in sorting equipment and can cause mechanical issues. The recycling process of polypropylene involves several phases.
In this first stage, PP is collected from polypropylene collection receptacles and transported to the recycling facility. Collecting the plastic to be recycled depends on how the individual business or individuals public dispose of their plastic waste. When it comes to bulk bags specifically, the Plasmatic Process Bulk Bag Compactor is a great option for manufacturers who go through a large amount of FIBCs.
Sorting and cleaning
Then the polypropylene recycling process continues by separating PP from mixtures with other plastics and contaminants. Often, density is taken into consideration as well as what the original configuration of the polymer was meant for. The chemical recycling of polypropylene removes contaminants during this part of the process. Many bulk bags and containers originally held fertilizers or chemicals, and without cleansing, manufacturers are not able to make new products.
Once the plastics have been cleaned and prepped, depending on the original intent and configuration, some are sent to the shredder.
Some plastics will be sorted based on attributes such as color, size, shape, melting point or light absorption. The machines also sort the plastic into different areas depending upon certain properties as well as what it will be used to produce next.
The final phase is compounding. This is the mechanical process of recycling polypropylene. Here, the plastics are recombined using a machine called an extruder, which melts down particles at a high temp, creating pellets of the plastic. Then, the pellets or granules are ready to be used by manufacturers to make brand new products!