Influence of precision injection mold What are the reasons

Mold designers must have extensive experience in the design and injection molding, we must consider the relationship between these factors and the apparent factor and injection conditions, such as the injection pressure and cavity pressure and filling speed, injection melt temperature and mold temperature, mold Structure and gate form and distribution, as well as affect the gate cross-sectional area, wall thickness, the plastic material content of the reinforcing filler, the plastic material of the crystallization degree of orientation and other factors. Also due to the above factors of different plastic materials, or other molding conditions such as temperature, humidity, and continues to crystallize, after the change of the injection molding machine varies.

    In related factors among precision injection mold is the key to meet the quality requirements of precision plastic products obtained. Mold design, mold design is reasonable will directly affect the quality of plastic products. Due to the size of the mold cavity is coupled by a required dimension of plastic shrinkage of the material used to obtain, and shrinkage often is a number in a plastic manufacturer or plastic sheets recommend a range, it is not only the gate of the mold form , gate location and distribution, but also to plastic crystal orientation (anisotropy), the shape of plastic products, the size of the distance and location of the gate. The main factors affecting the plastic shrinkage, including heat shrink, shrink phase transition, orientation shrinkage, compressive shrinkage and elastic recovery, and these factors with precision injection molding products, conditions or operating conditions.

    Because the plastic injection molding process is a process from the solid (powder or pellets) to liquid (melt) ED solid (product) change. From pellets to melt, and then, from the middle to the role of the product after the melt temperature field, flow field and density field and so on. Under the combined effect of these fields, a different plastic (thermosetting or thermoplastic, crystalline or amorphous, reinforced or non-reinforcing type, etc.) have a different morphology and rheological properties of polymers. All these factors affect the "field" is bound to affect the physical and mechanical properties of plastic products, size, shape, accuracy and visual quality.

    Thus, the intrinsic link process factors and polymer properties, morphology and plastic products will be demonstrated by between plastic products. These analyzes clearly intrinsically linked to reasonably prepared for the injection molding process, the rational design drawings in accordance with manufacture of molds, as well as a reasonable choice of injection molding equipment are important. Precision injection molding and injection molding in ordinary injection pressure and injection rate is also different, precision injection often used high or ultra-high pressure injection, high speed injection molding to obtain a smaller shrinkage.

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