As outlined in the article “Rotational Molding Process” from IQS Directory, this method entails several essential steps for crafting precision-engineered plastic components.
Pulverized Resin: The process begins with milling or pulverizing pellets or coarse powders into fine or extra-fine powder. This ensures the proper consistency required for the molding process, with various methods employed based on the type of molding.
Raw Material Selection: meticulously choose raw materials based on their physical properties and intended applications. Polyethylene, including LLDPE, MDPE, HDPE, LDPE, and XLPE, are commonly used for their thermoplastic nature, allowing for easy reshaping by heating.
Loading: Carefully measured quantities of powdered resin are loaded into hollow molds, ensuring homogeneity and proper flow to prevent bubble formation. The amount of resin loaded directly influences the wall thickness of the final part.
Mold Preparation: Molds, typically made from cast aluminum or fabricated steel sheet, impart the desired shape to the molded part. Mold release agents, categorized into sacrificial, semi-permanent, or permanent coatings, facilitate effective part removal post-cooling.
Heating: The loaded resin undergoes heating within the hollow mold while rotating slowly, ensuring uniform distribution as it melts and coats the inner mold walls. Biaxial rotation at controlled speeds guarantees consistent results.
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