Plastic Ventilated Crate Injection Mold

The raw material of the plastic ventilated crate injection mold

Commonly in the market, the raw material of the box is PE or PP.

PE insoluble in water with min water-absorbing properties, or to some chemical solvent can be dissolved above 70℃. So using PE to produce the box, can have high wear resistance, be lightweight, and longer useful life. Also, there are many organic solvents, so boxes with PE can have good corrosion resistance, even in an oxidizing environment. One of the disadvantages of PE is not good mechanical properties, the tensile strength is low, if using in a low-temperature environment, it will easily be damaged.

PP is hard with good cold tolerance, high chemical stability. The density of PP is between 0.895 and 0.92 g.cm. The density of polyethylene can vary from a low of 0.857 g/cm3 and to a maximum of 0.0975 gm/cm3. As you can see, PP has the lowest density. Polyethylene is further broken down into weights or densities which is done so the plastic can serve a more specific purpose. This is done during manufacturing. 

The application of beryllium copper in mould

The thermal conductivity of the beryllium copper material is conducive to controlling the temperature of the plastic injection mould, making it easier to control the molding cycle while ensuring the uniformity of the mold wall temperature.

If the forming cycle of beryllium copper is much smaller than that of the steel mould, the average temperature of the mould can be reduced by about 20%. When the difference between the average release temperature and the average wall temperature of the mould is small (for example). Using beryllium copper mould material can shorten the cooling time by 40%.

The mould cost budget and the continuity of production are very important to the manufacturer. Under the condition that the strength and hardness of beryllium copper meet the requirements, the insensitivity of beryllium copper to the mold temperature stress can greatly increase the service life of the mould.

Before determining the beryllium copper mould material, the bending of beryllium copper should also be considered. Use strength, elastic modulus, thermal conductivity, and temperature expansion coefficient. The thermal stress resistance of beryllium copper is significantly stronger than that of die steel.