Why is it always said that one step is wrong? If there is a problem in the details of the initial process, it will cause problems in the entire program or the system, whether it is the pouring link or the cooling link, a slight deviation in the control temperature will cause Molding errors and poor exhaust will also lead to quality degradation. So, what are the precautions for injection molding in Shenzhen?

1. Material fluidity

Compared with the fluidity of thermoplastics, Shenzhen injection molding can generally analyze data from a series of indexes such as molecular weight, melt index, Archimedes spiral flow length, apparent viscosity and flow ratio. The conclusion is that in the material, the molecules are small, the melt index is high, the spiral flow length is long, and the apparent viscosity is small. If the flow ratio is large, the fluidity is good. For plastics of the same product name, the manual must be checked to determine whether the fluidity is suitable for Injection molding.

2. Hygroscopicity

There are various additives in plastics, which make them have different degrees of intimacy to moisture. Shenzhen injection molding plastics, which are popular among customers, can be roughly divided into two types: moisture absorption, moisture adhesion, and moisture absorption and non-sticking. The material The amount of water must be controlled, otherwise the water becomes gas or hydrolysis occurs under high temperature and high pressure. Therefore, hygroscopic plastics must be preheated with appropriate heating methods and specifications as required to prevent re-absorption of moisture during use.

Reassured Shenzhen injection molding plastics have different thermal properties such as specific heat, thermal conductivity, and heat distortion temperature. Plasticizing with a high specific heat requires a large amount of heat, and an injection molding machine with a large plasticizing capacity should be selected for thermal performance testing first. The cooling time of the plastic with high heat distortion temperature can be short and the demoulding is early, but the cooling deformation should be prevented after demolding. Plastics with low thermal conductivity have a slow cooling rate, so sufficient cooling is required, and then the cooling effect of the mold should be strengthened. Hot runner molds are suitable for plastics with low specific heat and high thermal conductivity.

The inside of the mold cavity is composed of the synthesized core and cavity. According to the manufacturing and requirements of the process, Shenzhen injection molding process, whether it is a combination or a whole, should be properly arranged in the parts that are easily damaged and difficult to process. In the exhaust process, if the exhaust is not smooth, it will cause cracks and bubbles in the manufactured products, which will seriously affect the quality of the products and reduce the efficiency. Therefore, it is necessary to be careful in details.