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The rotational mould is not easy to deform and bend


source:Foshan Rotomolding|Rotational Molding Processing|Rotational Molding-Shunde Zhongze Mould date:2020-10-21 14:03

The rotational mould is not easy to deform and bend

The mold used in rotational molding is a single wall closed mold, which gives the outline of the product, but the internal contour of the product can not be accurate to the details. The rotational molding water tank is suitable for the production of various kinds and small quantities of plastic products. The material of the mould used for rotary molding is generally selected to weld the common carbon (c) plain steel plate. The cost of welding die is relatively low, especially suitable for large rotary plastic products. The rotary molding process has the following basic requirements for its mold:

The die is not easy to deform and bend in the process of heating and cooling repeatedly.

The mold should be attached with a clamping mechanism which is easy to loosen, so that the mold can be closed tightly in the heating and cooling process, and can be opened easily when the product needs to be unloaded and loaded. The cost of rotational molding mold is low - for products of the same size, the cost of rotational molding mold is about 1 / 3 to 1 / 4 of the cost of blow molding and injection mold, which is suitable for molding large plastic products.

The design and installation of the mould should facilitate the relative movement of the air flow around the mould surface, so that the mould can be heated and cooled uniformly (J ū N Y ú n).

The mould (Title: mother of industry) should be provided with vent pipe to prevent the gas in the mould from being inflated by heat during heating and extrude the molten plastic along the die closing seam, and to prevent the deformation of the mould and products caused by negative pressure in the mould during cooling. In addition to oil storage, the rotational plastic military oil tank also plays the role of heat dissipation, separation of air bubbles and precipitation of impurities in the hydraulic system.

When designing the local structure of the mould (Title: mother of industry), deep cavities and holes, as well as stiffeners and solid bulges should be avoided as far as possible, because powder materials are difficult to cover the surface of the above structures.

Suitable for molding large and extra large parts

Most plastics (structure: synthetic resin, plasticizer, stabilizer, pigment) forming process( In the molding process, plastics and molds (the name: mother of industry) are under quite high pressure (pressure), such as injection molding, compression molding, extrusion, blow molding (a rapid development of plastic processing method), etc. Therefore, when using these molding processes to produce large plastic parts, it is not only necessary to use the The mold under great pressure makes the mold heavy and complex, and the plastic molding equipment must be designed and manufactured very firmly. The difficulty of processing and manufacturing of the machine mold increases correspondingly, and the cost increases. On the contrary, the rotational molding process only requires the strength of the frame to support the weight of the material, the mold and the frame itself, as well as the mold closing force to prevent material leakage. Therefore, even if the rotational molding large and extra large plastic parts do not need to use very heavy equipment and mold, the processing and manufacturing of machine mold is very convenient, the manufacturing cycle is short, and the cost is low. Theoretically speaking, there is almost no upper limit on the size of parts formed by rotational molding process. It is impossible to produce such a large plastic container without expensive and huge blow molding equipment.