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Nylon is a crystalline plastic with a wide variety of varieties, reaching more than 130 varieties. Applied to injection molding are nylon 6, nylon 66, nylon 610, nylon 1010 and copolymerized nylon, super tough nylon, glass fiber reinforced nylon, mineral reinforced nylon and the like. In the world's plastics processing market, the most widely used in plastic molding is nylon 66.

The application fields of nylon 66 are generally in the fields of automobiles, electronic appliances, chemical equipment, machinery and the like. From the end use point of view, the nylon 66 consumed by the automotive industry took the first place, and the electronic appliances accounted for the second place. About 88% of nylon 66 is processed into various plastic products by injection molding, and about 12% of nylon 66 is processed into corresponding plastic products by extrusion, blow molding and other molding processes.

Usually the new developed and designed products need to make prototypes. Rapid prototyping is the first step of verifying the feasibility and manufacturability of the product, is the most direct and effective way to find out the defects and disadvantages of the designed products, so as to improve until you can't find the deficiencies from prototypes. At this point, it is usually necessary to carry out low volume production to perform trial production to find out the shortage in the large volume injection molding, so as to improve. There is no 100% perfect product design, and sometimes the designed plastic products can't be normally used. Once there are defects in the large volume injection molding, the all injection molded parts will be scrap, which will waste manpower and material resources and time. The prototypes are generally a small number of samples, the prototype manufacturing cycle is short, and the human and material loss is low. Quickly find out the inadequacies of product design and improve it, and provide sufficient basis for batch injection molding.
Improper injection mold design often results in various defects of finished plastic products. Before modifying the injection mold, first do mold trial and evaluate, optimize the injection mold design and injection molding process parameters, usually can achieve twice the result with half the effort, while meeting the high quality requirements of large volume injection molding.

Guangdong
Guangdong is the most important plastic injection mold market in China now, and it is also Chinese largest plastic mold export and import province. More than 40% of the Chinese plastic injection molds are made in Guangdong. And the numerical control rate of and equipment performance of mold machining equipment, mold processing technology, production specialization level and standard level lead other provinces and cities in China.

Among the top 10 injection molding companies in China, there are five companies are from Guangdong. And the world's largest mold base supplier and Asia's largest injection molding manufacturer are in Guangdong.
With the further optimization of Guangdong's industrial structure, the development of many industries such as petrochemicals, automobiles, and high-tech has put forward higher requirements for injection mold manufacturing in Guangdong. In the next few years, injection mold manufacturing will become increasingly precision and high-end.

Injection molded plastic parts refer to various plastic products processed by plastic injection mold combined with injection molding equipment, including finished and semi-finished plastic products. The injection molding process of plastic parts is based on the type of plastic (thermoplastic or thermosetting), the shape and dimension of injection molded plastic parts etc. The plastic molding process generally use injection molding, blow molding, extrusion etc. Among them, the injection molding is mostly common.
In order to make the injection mold precise and high-quality, injection molding manufacturing will heat the injection molds. It can not only improve the precision of the injection molds, but also improve the quality and precision of the injection molded parts. ACO Mold injection molding factory share precautions about heat treatment of plastic injection mold with product companies. There are main 4 sections of forging process, pre-heat treatment, quenching, and temper.
The parting surface is for taking out the injection molded plastic part from the mold cavity or in order to meet the needs of plastic molding, such as the installation of insert, and the exhaust. According to the structure of plastic part, the part of the injection molded part is divided into several parts of touch surface. It is divided into horizontal parting surface, vertical parting surface and composite parting surface. When plastic injection molding, in order to facilitate the release of the injection molded part, the plastic injection mold is made into several parts and the joint surface is called the parting surface. When selecting parting surface, try to ensure the quality of the injection molded plastic parts and simplify the processing process of mold making and injection molding. The selection of the parting surface is also the first step in the mold design. It is affected by many factors such as the shape, appearance, wall thickness, dimensional accuracy, and number of cavities.
The basis for judging precision injection molding is the precision of the injection molded product, that is, the dimensional tolerance, shape tolerance and surface roughness of the plastic product. There are many relevant conditions for precision injection molding, and the most essential are the four basic factors of plastic materials, injection molds, injection molding processes and injection molding equipment. When designing plastic products, engineering plastic materials should be selected first, and engineering plastics capable of precision injection molding must use materials with high mechanical properties, dimensional stability, good creep resistance and environmental stress cracking resistance. Secondly, the appropriate injection molding machine should be selected according to the selected plastic material, the dimensional accuracy of the finished product, the weight of the plastic part, the quality requirements and the expected mold structure. In the process of precision injection molding, the factors affecting precision injection molding products mainly come from the precision of the precision injection mold, the shrinkage of the injection molding, and the variation of the ambient temperature and humidity of the product.
In the past, molds for injection molding were usually made of steel or aluminum, and were manufactured using reduced-material manufacturing techniques, such as CNC machine tools. But more and more companies have recently tried to use more advanced 3D printing processes to simplify the mold making process.

When plastic molding, the temperature of mold cavity is required to reach 300 °C or higher. Such large temperature difference will easily cause that the cavity structure generates microscopic changes, which lead to the change of mold size and the un-stability of the size of plastic part. So, the heat treated steel can be used. In order to improve the hardness and wear resistance, injection mold is generally subjected to heat treatment. We’d better use the pre-hardened steel which has smallest influence on mold size and can be machined by cutting. This steel doesn’t require heat treatment after machining.

The cooling system is also called heat exchange system. When the melt is injected into the cavity, the cooling system cools and condenses the injection molded parts quickly. The economic significance is to shorten the molding cycle and improve the production efficiency. The design of cooling system is often limited by the geometry of cavity (mold cavity), the parting line, the slider and the ejector rod. Therefore, it cannot be rigidly designed according to the standard distribution. The cooling system must be designed to ensure rapid and uniform cooling.

(1) Exclude the air in the cavity when injecting the molten material
(2) Exclude various gases generated during the heating process. The thinner the wall of molded part, the farther away from the gate, the more important the setting of air vent. In addition, for small parts or precision parts, the setting of air vent is also should be paid attention. Because it can avoid the surface burns of injection molded part and insufficient injection volume, and can also eliminate various defects of molded product and reduce mold pollution, etc. So, how to know that the exhaust of cavity is sufficient? In general, if the melt is injected at the highest injection rate without leaving a focal spot on the injection molded part, it can be considered that the exhaust in the cavity is sufficient.

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