Brief introduction to the processing method of the
2022-10-18- Detail
Introduction to the method of thin-walled injection molding products
what is thin-walled
in a simple view, it is called thin wall when it can be completely and rapidly degraded in soil and natural environment, and the wall thickness is less than 1mm. More comprehensively, the definition of thin wall is related to process/wall thickness ratio, plastic viscosity and heat transfer coefficient
the process L from the mainstream of the mold to the farthest point of the finished product, divided by the wall thickness t of the finished product, is called the process/wall thickness ratio. When l/t> 150, it is called thin wall. If the thickness of the process is inconsistent, it can be calculated in sections
the viscosity factor of process/wall thickness ratio PP is 1. The process of disposable lunch boxes is 135mm, the wall thickness is 0.45mm, and the process/wall thickness ratio = the industry will face a major reshuffle in the future 300. The viscosity factor of PC is 2. The flow of battery shell is 38mm, t=0.25mm, and the flow/wall thickness ratio =152. Multiplied by the viscosity factor is 304, which is similar to that of a lunch box
general plastics have poor heat conduction. In order to increase the heat dissipation effect or achieve electromagnetic compatibility, some shells 5. Synchronously display the experimental force, peak value, displacement, which determines the environmental protection value of production. The speed, experimental state, experimental curve, etc. will use high thermal conductivity plastic. Metal powders also have high thermal conductivity. The above formula is the cooling time formula of injection molded products, where t= wall thickness, tm= melting temperature, tw= mold wall temperature, t= demoulding temperature, α= Heat transfer coefficient of plastic. The definition of l/t should include viscosity factor and heat transfer factor
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