Regranulate Production Process: 7 Steps from Plastic Waste to Raw Material

Regranulate is a plastic material made from processed plastic and formed into small granules. In this form, it can be used to manufacture new items through injection molding or extrusion. The process of producing regranulate consists of seven steps, each of which affects the final quality of the raw material.

Step 1 – Collecting plastics

The process begins with obtaining the raw material, which usually comes from two sources. The first is manufacturing plants, which supply post-production waste—uniform and relatively clean, making further processing easier. The second source is packaging waste, such as bottles or films, which requires more work because of contamination and its varied composition.

Step 2 – Sorting raw materials

Sorting is one of the key stages of the entire process. At this stage, individual types of plastic, including PP, PE and PET, are separated. Each has a different melting point and mechanical properties, so mixing them would result in a material with unpredictable performance characteristics. This is where the quality of the final product begins, and mistakes made at this stage are difficult to correct later.

Step 3 – Washing and cleaning plastics

The sorted plastic then undergoes a washing process, during which sand, food residue, labels, adhesives and other contaminants are removed from its surface. This stage has a real impact on the material’s smell, appearance and behavior during further processing. Even minor contamination can cause problems during melting or subsequent forming.

Step 4 – Shredding the raw material into flakes

Once the plastic is clean, it is shredded. It is fed into machines that cut it into small pieces resembling flakes. This makes the material easier to melt and filter in the next stage.

Step 5 – Melting and filtering

The finished flakes are still not granulate, so the shredded plastic is heated until it becomes liquid. During this stage, it passes through filters that retain fine contaminants. Melting and filtering are the heart of the entire process, because these operations determine how clean the finished regranulate will be.

Step 6 – Granulation preparing regranulate for use in injection molding and extrusion processes

Once the plastics are in liquid, filtered form, they are formed into granules. This form is not accidental. Granulate is easy to transport and store, and can be precisely dosed in production machines. As a result, plants using recycled plastic granulates can maintain consistency in the products they manufacture.

Step 7 – Quality control affecting the consistency of regranulate parameters

The final stage in producing regranulates is quality control of their parameters. If this process is omitted, problems arise:

differences between batches,
production difficulties,
and sometimes lower durability of finished products.

High-quality material is characterized by consistent properties, including melt flow rate and impact strength. That is why suppliers focused on quality stability, such as HillTrade, carry out detailed verification of every batch, ensuring both consistent parameters and continuity of supply.

The process of producing this raw material involves much more than simply processing waste. It is the result of seven standardized stages. From the source of the waste, through sorting and washing, to the final tests—each step matters for the final quality of recycled plastic granulates. When the process is conducted conscientiously, plastic waste becomes a fully-fledged raw material that can safely re-enter circulation and be used in manufacturing processes.

What Does the Regranulate Production Process Look Like? Step by Step – From Waste to New Raw Material