Design and selection of rolling molding molds

1. Reasonable mold design: The mold design of rotational molding products should fully consider factors such as product shape, size, wall thickness, etc., to ensure that the mold's bearing capacity meets the requirements of the product. If necessary, reinforcement ribs or tighter structures can be designed to enhance the stability of the mold.

    Demolding direction and mold maintenance: When designing the mold, it is important to avoid damage to the product during the demolding process, while also considering the number of mold pieces to control mold costs and maintenance difficulties. In addition, regular inspection of molds, removal of residual materials and debris, and maintenance of smooth and clean mold surfaces are crucial for extending mold life and ensuring product quality.

2. Material selection and consideration of characteristics

    Material Applicability: Thermoplastic materials suitable for rotational molding should be selected for rotational molding products, such as PE (polyethylene), especially LLDPE, HDPE, etc. When selecting materials, it is necessary to consider their chemical corrosion resistance, high temperature resistance, wear resistance and other characteristics to meet the requirements of product use.

    Material processability: The processability of materials is also an important factor in selection, including their melting temperature, flowability, etc. These characteristics will directly affect process parameters such as heating temperature and mold rotation speed during the rotational molding process.

3. Key control points during the processing

    Heating temperature and mold rotation: Controlling the heating temperature is a key step in rotational molding, ensuring that the material is fully melted and evenly coated on the surface of the mold cavity. The rotation speed and direction of the mold are also important factors affecting the molding effect, which need to be adjusted according to the material properties and product shape.

    Closing and Cooling: The sealing degree of the mold during closing directly affects the leakage of materials, and it is necessary to ensure that the mold is tightly closed. During the cooling process, it is necessary to avoid deformation or cracking of the product due to excessive temperature differences. Natural cooling or local air cooling can be used for adjustment.

4. Finished product quality and subsequent processing

    Finished product quality inspection: Conduct strict quality inspections on rotational molded products, including dimensions, appearance, and functionality, to ensure that the products meet design requirements and usage standards.

    Subsequent processing and packaging: Adjust, decorate, and install accessories as needed to obtain qualified and aesthetically pleasing roll molded products. Finally, the finished product should be properly packaged and stored to protect it from damage and facilitate transportation.

    In summary, rotational molding processing requires attention to multiple aspects such as mold design and selection, material selection and characteristic considerations, key control points during the processing, and finished product quality and subsequent processing. Only by comprehensively considering these factors and strictly controlling each link in the processing can high-quality rotational molded products be produced.