The basic requirements of rotomolding process for its mold

- Mar 13, 2021-

We all know that rotomolding processing technology has become more and more popular in recent years, and its process advantages are many. This is what we know, but what are the requirements for rotomolding molds? Let me give you a brief introduction!

1. The mold material should have good thermal conductivity. So that when the mold is heated, the heat can be transferred to the material in the mold as soon as possible.

2. The mold will not be deformed or flexed during repeated heating and cooling.

3. The mold should be attached with a clamping mechanism that is easy to loosen, so that the mold can be closed tightly during the heating and cooling process, and it can be easily opened when the product needs to be unloaded and loaded.

4. The design and installation of the mold should facilitate the relative movement of the airflow around the mold surface so that the mold can be heated and cooled uniformly.

5. The mold should be equipped with a vent pipe to prevent the gas in the mold from being heated and expanding and the molten plastic is extruded along the mold joint during the heating process, and the negative pressure in the mold during the cooling process causes the mold and the product to deform.

 The size of the mold, the complexity of the cavity, the quantity, the surface detail texture, the thermal conductivity and the rated mold weight of the rotomolding equipment are the 5 basic elements that need to be considered when choosing a mold manufacturing method

Complex cavity molds should adopt casting method; large product molds should adopt thin plate welding method; molds that require fine texture on the surface should adopt electroforming method. In order to improve productivity and require the manufacture of multi-cavity molds, casting molding is the preferred choice. When multiple molds are placed on the same support frame to rotate, the thermal conductivity of different molds should be adjusted appropriately so that each product has the same heating and cooling cycle.

The weight of the mold is also one of the most important factors to consider. It should be noted that the sum of the weight of the mold and the weight of the material should not exceed the maximum capacity of the rotomolding machine. When designing the local structure of the mold, try to avoid deep cavities and holes, as well as structures such as ribs and solid protrusions, because powdery materials are difficult to cover the surface of the above structure. In order to fix the metal insert at a certain position in the mold, a special fixture is required on the mold .