The stage of injection mould pressure preservation is also a stage of continuous pressure application. The density of plastic also increases with the increasing pressure of the injection moulding machine. In the process of injection mould pressure preservation, the cavity is slowly filled with plastic, resulting in the injection mould back pressure gradually increased. In the process of pressure preservation, the screw of the injection moulding machine moves forward slowly, and the rate of plastic is relatively slow. In this case, the flow is called pressure preservation flow. In the injection mould pressure preservation stage, the plastic is cooled, resulting in accelerated solidification, increased melt viscosity, and large resistance in the cavity. At the later stage of pressure preservation, the material density continues to increase, and the plastic parts are also moulded by injection moulding. When the gate solidifies, the stage of pressure preservation is finished, and the pressure in the cavity reaches the maximum value.
Injection moulding process is divided into many types. The rotational moulding process method is that to add plastic into the mould first, and then the mould is continuously rotated along two vertical axes and heated. The plastic in injection mould is gradually and evenly distributed under the action of gravity and heat energy, melted and adhered to the entire surface of the cavity, formed into a desired shape, and cooled and moulded.

The products produced by this process include: fuel tanks, water tanks, mechanical enclosures, fenders, etc. The main alternatives are metal parts and glass steel products.

Injection moulding processing is a technology that is based on microfabrication technology such as LIGA, and of course there are many other methods. The LIGA process is to produce a model that is needed for injection moulding, which is commonly known as "mould" . And then the liquid plastic is poured into the mould, and finally separated to form the final desired product. For example, some plastic toys, and many other products.
Quenching is rapid cooling in quenching medium such as water, oil or other inorganic salt, organic water solution, etc. The steel hardened but became brittle at the same time. Quenching purpose is to improve the mechanical properties of metals or parts and improve the performance or chemistry of certain special steel. However, some problems may be encountered when the injection moulding quenching is carried out in the injection mould factory.
What are the consequences of excessive number of injection mould trials?
The unreasonable design of the injection mould makes the number of trials increased, which increases the investment in injection moulds. In addition, it will also extend the injection mould cycle.
The best injection moulding process and suitable injection moulding machine are selected during the injection mould trial, and the physical properties of the plastic are fully understood, which can effectively reduce the number of injection mould trials, so choosing the good injection mould factory is very important!
Injection mould trial

Cracking is a common defect in plastic products. The main reason for this is due to stress and deformation. There are mainly residual stress, external stress, and stress deformation caused by the external environment.
The reason for this defect is essentially the same as insufficient filling, just to a different extent. Therefore, the solution is also basically the same as the above method. Especially for resins with poor fluidity (such as polyoxymethylene, PMMA resin, polycarbonate and PP resin, etc), attention must be taken more to properly increase the gate and proper injection time.
In order to improve the material's rigidity and wear resistance, general materials need to be heated above 1030°C. At high temperatures, various alloying elements are fully dissolved in the austenite so as to obtain a high hardness of the substrate during quenching, and in order to ensure that the parts do not undergo decarburization and oxidation, a vacuum treatment is applied accordingly. At present, high-rate gas quenching and quenching furnaces used in the semiconductor industry can heat injection mould parts under high vacuum conditions through nitrogen protection, which not only ensures the decarburization and oxidation of injection mould parts, but also prevents the evaporation of alloying elements.
In the injection moulding process, mould temperature is an important factor affecting the quality of injection moulded parts. In general, setting a higher mould temperature usually results in higher higher surface quality of injection moulded part. Cold and hot cycle plastic injection moulding process is a method of controlling mould temperature using thermal cycling during the injection moulding cycle. This technique requires that the heating temperature of mould surface is above the glass transition temperature (Tg) of plastic to facilitate injection moulding, and then the mould temperature is quickly cooled to allow the parts to be cold-solidified for easy ejection.

Cold and hot cycle plastic injection moulding process can greatly improve the surface quality of injection moulded parts, in addition, reducing the secondary processing steps such as painting and grinding and so on to eliminating surface flaws, which reduce the entire processing cost. In some cases, painting or grinding can be omitted. Cold and hot cycle plastic injection moulding can also improve the surface finish of glass-reinforced structural materials, and is used where high gloss is required on the surface of injection moulded part. Other advantages include: reducing moulding stresses, reducing or eliminating turbulence, weld seams, and other defects, and increasing the melt flow length to produce thin-walled injection moulded parts.
Plastic Injection Moulding Process
EDM is suitable for a wide range of materials. Due to the high local energy of the pulse discharge, any hard, brittle, high-melting conductive material can be EDM processed. Since the energy density during pulse discharge is relatively high, it is convenient to process special materials and complex shaped workpieces that are difficult or impossible to process by ordinary machining methods, and are not affected by the material hardness and heat treatment conditions. Since the duration of the pulse discharge is extremely short, the range of heat conduction and diffusion after discharge is relatively small, so the range of the material affected by heat is very small.
The five elements that injection moulding needs to meet is temperature, speed, pressure, position and time. These five factors determine the quality of injection moulded parts. And the above five factors are the key point of controlling qualified product quality.
Injection Moulding
The injection mould is a tool for producing plastic products. In the process of plastic injection mould processing, the plastic melted by heat is injected into the mould cavity by the injection moulding machine under high pressure, and after cooling and solidification, the injection moulded products are obtained. What are the features of plastic injection moulding processing?
Injection MouldInjection Moulded Parts
Injection mould is an indispensable tool in the plastic injection moulded parts production industry. Injection mould is generally composed of a total of seven systems: casting system, guiding system, forming system, core pulling system, ejector system, cooling system and exhaust system. The injection mould design is a very important step in the manufacturing of injection mould. In the design process, we need to take into account all aspects, so that finally the designed injection mould is able to meet the production needs. And then what are the points need to pay attention in the injection mould design process?
3D Design of Injection Mould
The components of plastic injection mould can be divided into two
categories according to their use. One type is the structuralMould Steel part, including the casting system, the guide part, the fixed (moving) formwork, the ejector component and the support part etc. The plastic injection mould materials are generally medium and low carbon carbon structural steels or alloys. The other type is moulded part, including cavity, core and inserts, etc., that are the key components of making plastic parts moulded directly. The working temperature of plastic injection mould is 200 to 300 °C. The cavity of plastic injection mould is complex, there are high requirements for dimensional accuracy and the surface roughness, and corresponding requirements are put forward for the machining performance of the plastic injection mould steel, the mirror polishing performance, the heat treatment deformation and the dimensional stability etc,. Therefore, When ACO Mould chooses plastic injection mould materials, while ensuring the performance requirements of plastic injection moulds, as much as possible to improve its processing performance.
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Online tour of our plastic injection mould making factory in Shenzhen China.
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