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NCK Technology Co.,Ltd

Plastic Injection Molding Has High Economic Benefits

Plastic injection molding is one of the commonly used methods in plastic processing. The method is applicable to all thermoplastic materials and some thermosetting plastic materials, and the number of plastic injection molding products is much larger than that of other conventional metal plastic injection molding methods. Because the injection molding process not only produces more, Custom Injection Molding And Plastic Molding but also applies to a variety of raw materials, can batch, continuous production, and has a stable size, easy to realize the automation and high speed of production, with a great economic benefits.

Plastic injection molding of the basic process is: plastic through the injection molding machine screw extrusion and heating, become molten state can flow melt. Driven by the screw, the plastic melt through the injection molding machine nozzle, mold main road, shunt and gate into the mold cavity, Custom Injection Molding And Plastic Molding forming a certain shape and size of the products. The result of injection molding is to produce plastic products that meet the user's requirements. To obtain qualified products, must have a reasonable design, Custom Injection Molding And Plastic Molding the manufacture of sophisticated molds, but also need to have and the mold supporting the advanced injection equipment (injection molding machine) and reasonable processing technology. As a result, molds, injection molding machines and processes are often referred to as three essential elements for the smooth process of injection molding.

For the use of plastic injection molding processing methods for the production of plastic products, reasonable molding process is the three basic elements of the most important factor. Custom Injection Molding And Plastic Molding The so-called molding process, simply speaking, the pressure, temperature, time (speed) of the three elements constitute the most reasonable collocation. During the molding process, in particular, the formation of precision products, to establish a group of the best molding is not easy, Custom Injection Molding And Plastic Molding because the factors affecting molding conditions are many, in addition to the shape of the product, mold structure, injection equipment, raw materials, etc., voltage fluctuations, environmental temperature changes on the molding has a certain impact.

Injection pressure plastic melt from the pressure of the region to the low pressure of the region, in the injection process, injection molding machine nozzle at the highest pressure, in order to overcome the melt flow resistance in the whole process. Subsequently, the pressure along the flow length to the melt at the forefront of the gradual reduction, Custom Injection Molding And Plastic Molding if the cavity internal exhaust good, then the melt front end pressure is atmospheric pressure.

The injection pressure is different from that of the material and the flow behavior of different materials shows that the required injection pressure is different. Melt viscosity is the most significant influence on injection pressure in flow properties. In general, melt viscosity is a function of temperature, Custom Injection Molding And Plastic Molding shear rate and injection pressure. This means that the same plastic melts may have different viscosity depending on the molding process, and different materials may have a wider viscosity range. However, under the same temperature and shear rate, the viscosity of different materials is not the same, in the premise of satisfying the requirements of use, should be as far as possible to select the relatively small viscosity of the material.

The three main processes of plastic injection molding are:

1. Heat the plastic to a temperature that can flow under certain pressure. This process is called the plasticizing of the material (plasticized).

2. Plastic curing in the mold. The molten plastic from the injection cylinder of the injection moulding machine is fed into the mould cavity through various flow lanes, Custom Injection Molding And Plastic Molding and finally the required workpiece is formed under the restriction of the cavity.

3. Stop heating to make the plastic curing, pressure cooling stereotypes become the required products, open the mold, remove the plastic parts.

Plastic injection process is a cyclical process, the entire cycle can be summed up in several major stages.

The main parameters and technological conditions of plastic injection molding process include injection pressure, mold temperature, molding cycle, temperature of injection plastic, Custom Injection Molding And Plastic Molding flow rate of plastic in mould, melt viscosity of plastic in mould and elastic shearing stress, melting and flow control and process control.

The efficiency and quality of plastic injection molding depends mainly on the design of the mould. In the design of injection mold, we should first consider various process conditions commonly used in injection molding process, according to the existing processing and molding technology and product shape to determine the design plan

Plastic injection molding consists of a injection nozzle, a molding module and a glue module. The molding module contains a molding cavity. The injection module is located between the injecting nozzle and the molding module, including a feed pipe, the feeding pipe is connected with the injection nozzle and the molding cavity, and contains two bend segments which can reduce the plastic flow rate sequentially.

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