By processing regrind via a melting process (Compounding) and adding additives compound (regenerate) is obtained.
The additives are used for example to specifically define the mechanical properties of the material.
The Regenerate (Compound) has, like the regranulate, a uniform particle size and no dust content.
Therefore the material can easily be reused for the production of injection moulding components.
Granule is obtained by processing regrind via a melting process (Compounding).
Reused plastic is used for this process, giving it the correct name “Regranulate”.
The particle size is uniform.
In contrast to the regrind there is no dust content in the regranulate.
Therefore it can be easily reused for the production of injection moulding components.
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During production of thermoplast materials wasted, like sprues and rejects can be reprocessed.
Grinding these plastic parts leads to the so called regrind.
Depending on the grinding process the regrind has different and irregular particle sizes from 6 mm to 8 mm.
During production of new plastic parts a variable quantity of regrind can be mixed with new material.
It has to be noted that the dust content can cause problems in production.
The duration that the plastic melt takes to travel from the plasticizing unit to the cavity of an injection mold is called residence time.
It is influenced by the size of the hot runner relative to the part, as well as by the cylinder volume and shot weight. A long residence time can occur when a large cylinder is used for small shot weights, potentially leading to thermal degradation of the material. If the residence time is too short, incompletely melted or unprocessed material may enter the cavity. An optimal residence time is crucial for part quality, ensuring uniform material processing and stable production. Excessive temperatures and shear stresses during prolonged residence times can cause material degradation, discoloration, or mechanical weakening. Precisely adjusting the residence time is therefore essential for maintaining the quality and durability of plastic components.
The science of the flow behavior and deformation of materials, particularly polymer melts in processing is called rheology. In the plastics industry, rheology is crucial for understanding viscosity, shear thinning, and the elongational behavior of polymer melts. Rheological properties significantly influence processes such as injection molding, extrusion, and blow molding, as they determine the material’s flowability and formability. Factors such as temperature, shear rate, and polymer molecular structure play a key role in the rheology of plastics. Rheological measurements help optimize processing parameters and ensure the quality of final products. A solid understanding of rheology helps to prevent flow-related issues and enables the production of precise and high-quality plastic parts.
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