Injection molding technology and injection molding product features

Eleanor 2022-07-15

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Injection molded products are widely used in the fields of automobiles, toys, machinery, home decoration, electronic appliances, household daily necessities, food packaging, etc. The range of applications is small business online payment processingexpanding. The following is a common short description.

Overview of injection molding process

Injection molding (also known as injection molding) is a process in which granular or powdered plastic materials are melted through an injection molding machine and then quickly cooled and cured in a mold to form plastic products with the same shape as the mold cavity.

Expanding knowledge: The main molding technology methods for plastics

The main molding methods for plastics include extrusion, injection molding (injection molding), blow molding, and calendering, among which injection molding can be used to produce relatively complex products. Injection molding is one of the important methods for molding thermoplastics. In addition, due to technology, materials, rapid moldingmechanical design and product requirements, other processing methods can be obtained from injection molding, insert molding as pre-built metal parts, multi-color and mixed-color injection molding, structural foam injection molding, co-injection molding, gas-assisted injection molding, hollow injection molding, and reaction injection molding (RIM) with liquid monomer or liquid prepolymer as raw material.

1. The three main stages of injection molding

From the definition data of injection molding, injection molding consists of three main stages as follows.

Pre-molding preparation

The work in this development stage includes the pretreatment of production materials, barrel cleaning, preheating of inserts for plastic material parts with inserts, and the selection of release agents for plastic packaging products with difficult product release techniques. It should be noted that, due to the different types of raw materials, forms, structure of plastic parts, with or without inserts, use of management requirements in the injection molding process in China, the work related to the preparation of various plastic parts before molding is not exactly the same information.

Injection process

The whole injection stage includes the steps of feeding, plasticizing, injecting into the mold, constant pressure cooling and demolding.

Post-processing of manufactured parts

The parts are inspected and post-treated so that the quality of the parts is stable and reliable and their appearance meets the requirements. Generally speaking, post-processing is a process engineering to further stabilize or improve the performance of injection molded products, which usually includes stress relief annealingm30s++, quenching and tempering, etc.

2. Characteristics of the injection molding process

The injection molding process can be used to prepare engineering parts and daily plastic parts of different shapes, sizes and qualities to meet the requirements of various applications. The characteristics of the injection molding process can be summarized as follows.

(1) Short molding production cycle time, such as a few seconds to a few minutes.

(2) Various parts with complex shapes, high dimensional accuracy, good surface quality, and metal or non-metal inserts can be molded simultaneously.

(3) High degree of automation, the injection molding machine can automatically complete all processes in the molding process, such as mold closing, feeding, plasticizing, injection, mold opening and product ejection.

(4) It can adapt to the molding of various major plastics. Almost all thermoplastics, thermoset plastics and elastomers can be molded into products by this injection molding method.

(5) Low wear and tear of the mold, easy loading and unloading management, and high production efficiency.

The rapid development of injection molding technology has made it easier to effectively control the flow characteristics of plastics, the mechanical properties of products and the appearance quality of products.

Characteristics of injection molded products

Injection molded products are plastic products manufactured by injection molding method. The characteristics of injection molded products are mainly reflected in a variety of molding materials, complex product structure and shape, high precision, and a wide range of applications.

Wide range of moldable materials

Plastics are mainly divided into thermoplastics and thermosets. Almost all thermoplastics can be made into products by injection molding. With the improvement of injection molding equipment and technology, thermosetting plastic products can also be produced by injection molding.

Complex structure and shape of products

By using injection molding technology, companies can manufacture plastic products with very complex shapes, which can be developed in mass production with little research and secondary trimming by our students. It is possible to design a plastic part with metallic or non-metallic inserts, mold the whole part, and improve the performance of the injection molded product.

High precision

With the emergence of precision molding and ultra-precision molding injection molding machines, the dimensional accuracy of injection molded products can reach a good range, such as some ultra-precision molding injection molding machines, the accuracy range can even reach 0.001 ~ 0.0001mm. For products with higher accuracy, the shrinkage of plastic needs to be considered.

Wide range of applications

Injection molded products are widely used in the fields of automobiles, toys, machinery, home decoration, electronic appliances, household products, packaging, national defense, education, health, communication and so on. At present, according to conservative estimates, plastic products shaped by injection molding machines account for more than a quarter of the total number of plastic products.

Easy to achieve some special requirements

By compounding plastic structures or adding special ingredients, some special requirements of products can be easily met. For example, by using different resins as the base material and adding carbon black, metal oxides, metal particles, conductive organic compounds, etc. For compounding, injection molded products obtained in this way often have specific features such as antistatic and electromagnetic wave shielding.

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