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How to solve the deformed conductive pp injection molding special material?
Distortion refers to the inconsistency of the shape of the injection-molded part. It is usually caused by the uneven shortening of the injection molded part, but does not include the deformation of the injection molded part formed during demolding. The characteristics of PP materials are relatively soft. At high temperature, plastic parts are heated, and the molecular movement changes simply. In order to effectively avoid the deformation of PP plastic parts, we can consider from changing the shape of the part, improving the injection molding process, dispersing the workload, and enhancing the characteristics of the data. How to solve the deformed conductive pp injection molding special material?
Minimize non-uniform wall thickness, and plan for equal wall thickness to reduce internal stress and avoid deformation. From the perspective of mechanics, the larger the plane, the simpler the variant, avoiding the plan of the plane, and making a three-dimensional part.
Make micro-arc planning for large area planes. Add stiffeners, rational layout and selection of the right stiffener size, but the thickness of the stiffeners should not exceed the thickness of the face glue level.
Adding wall thickness can also improve rigidity, but to avoid shrinkage of plastic parts, this is a costly method, which is far worse than the method of reinforcement.
The use of a higher grade of plastic in the production of plastic molds will definitely improve the rigidity of plastic products, but this will increase the cost. Therefore, in terms of data, the data cost is never improved, and low cost plastics are used to strengthen the method to solve the problem. Adding fiberglass is a common and sophisticated method. Adding glass fiber can also improve the creep function of the data.
The diameter of glass fiber added in plastic is 0.05-0.01mm, the length is 3-4 mm, the tensile strength is 700-2300MPa, which is several hundred times that of PP plastic, the melting point is above 1000 ℃, and the price is 6000-9000. Yuan / ton. Adding glass fiber (10-30%) in PP can greatly improve the stiffness of the data and improve the creep characteristics without increasing the cost.
The disadvantages of adding glass fiber are that the melt viscosity is large during injection, and the fluidity is poor. There are floating fibers on the surface of the part, which can be solved by the following methods: improve the mold temperature and injection temperature. Increase injection speed and pressure. Increase the gate and shorten the runner.
Due to the strength and hardness of glass fiber, the wear on the screw of the injection molding machine during injection processing will increase the service life of the screw. If the screw is used consecutively, the screw will be replaced in 1-2 years, so the injection cost is increased.