Different recycled plastics sheets are made from different wastes and from a variety of polymer types. As a result of this the processes that we use vary from material to material.
Recycling isn’t just one process, it’s a series of processes which start with removal of waste from the conventional waste stream (that might end up in a landfill site), and the final step of the recycling process is when someone buys a new product made out of what was originally waste. These processes include, collection, baling, sorting, cleaning, granulating or size reduction, melt processing, forming of a new product, sale of the new end product.
Plastics sheets show many of the characteristics of composite wood-based boards. Most woodworking tools can be used, providing they are kept sharp. The biggest problem is frictional heat, which causes the plastic material, especially swarf, to melt. The HIPS sheets are particularly susceptible to melting. The general rule is, 'fast speed, slow feed', and if necessary use water based cutting fluids.