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Use of reprocessed materials

Sprues and runners among moldings are not products. These portions are sometimes discarded, but in other cases they are finely reground and reused as materials for molding. These materials are called reprocessed materials.


Reprocessed materials are not solely used as materials for molding but usually used after blending with virgin pellets, since there is possibility of deterioration in various characteristics of the plastics because of the initial molding process. The maximum allowable limit for the ratio of reprocessed materials is about 30 %, because too high ratio of reprocessed materials may spoil the original properties of the plastics used.

For the properties when reprocessed materials are used, please refer to "reprocessing capability" in the plastic data base.

In the injection molding process, sprues and runners are portions of the molded product that are not part of the final desired shape. These portions are typically removed and discarded as waste. However, they can be collected and reprocessed for reuse as materials in future molding operations.

The process of reprocessing involves finely grinding the sprues and runners to create small plastic pellets or flakes. These reprocessed materials can then be blended with virgin pellets, which are unused plastic materials, to create a mixture suitable for injection molding. This blend of reprocessed and virgin materials is commonly used in molding operations to reduce waste and optimize material usage.

However, it's important to note that the use of reprocessed materials may affect the properties of the plastic. During the initial molding process, there is a possibility of degradation or changes in various characteristics of the plastic. Therefore, when reprocessed materials are used, they are often blended with virgin pellets to minimize the impact on the final product's properties.

The maximum allowable limit for the ratio of reprocessed materials to virgin materials is typically around 30%. Using a higher ratio of reprocessed materials may lead to a deterioration in the original properties of the plastic being used.

For detailed information about the properties and capabilities of reprocessed materials, it is recommended to refer to the "reprocessing capability" section in the plastic database. This information can provide specific guidelines and specifications for using reprocessed materials in injection molding processes.

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