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Design principles for plastic products

release time:2017-07-03 | Article Source:

Plastic injection molding design is mainly based on the use of requirements. In order to obtain high quality plastic injection molded parts, the plastic injection molded parts must have a good structure and technology, which can not only make the molding process run smoothly, but also get the best economic benefits. The design of plastic parts is different depending on the plastic parts forming method and the plastic raw material variety performance. Our company mainly based on injection molding, and accordingly we will discuss the design of injection molded plastic parts.

Plastic design principle is to ensure that the use of the product properties, electrical properties, physical properties, heat resistance, chemical corrosion resistance and mechanical properties under the premise of choosing the price cost and good molding property of plastic raw materials. At the same time, the structure is simple, the wall thickness is uniform and the molding is convenient. In the design of plastic parts, it should also consider the overall structure of the mold, mold cavity easy to manufacture, mold core pulling and ejecting mechanism is simple. The shape of the plastic parts is favorable for mold parting, exhaust, feeding and cooling.

Material selection of plastic injection molded parts:

The selection of plastic injection parts should be considered in the absence of special requirements to determine whether it can be achieved and required.

1, molding process characteristics: mainly plastic material flow properties, crystallization properties, heat sensitive properties.

2, the accuracy of the product: shrinkage of plastic materials shrinkage and shrinkage differences.

3. The mechanical properties of plastic: mainly consider the strength, rigidity, elasticity, toughness, bending, impact, and the sensitivity of the corresponding force.

4. The chemical properties of Plastics: mainly consider the tolerance, hygiene and safety of the contact products of plastic products.

5. The physical properties of Plastics: mainly considering the adaptability to environmental temperature changes, optical characteristics, degree of insulation or electrical insulation, perfection of finishing and appearance.

These requirements for plastic materials are often selected and compared by means of plastic characteristics. (see the attached table characteristics) qualified materials, and then determine the selected material meets the conditions of use of the product, it is best to do the experiment by the template. Here, in particular, the actual physical and mechanical properties by the standard sample data can not replace or estimate the products in the specific use conditions, only when the conditions of use and test conditions are the same, the test is not reliable. Therefore, the test environment should be used with the environment are similar, it is best to follow the idea of forming test to make the prototype mold, through testing product prototype mold production to confirm the target value, it will make the plastic material selection is more accurate.