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Even sometimes corrosive gases build up in the cavity, contaminating the plastic mold, reducing the life of the mold and increasing the cost of the plastic mold. cap mould factory If the plastic injection molding process parameters are adjusted, the plastic products still have insufficient filling, high internal stress, bubbles, etc. The source of gas in the injection molding mold:

The air present in the cavity and the casting system; the water vapor generated by the evaporation of the moisture contained in the plastic material at high temperature; the gas generated by the decomposition of the plastic at high temperature; the volatilization or chemical occurrence of certain additives in the plastic Gases generated by the reaction, such as thermosetting plastics, often produce gases due to chemical reactions. It is this back pressure that prevents the normal rapid filling of the molten plastic, making injection molding difficult.

The plastic mold is poorly ventilated, and the gas in the cavity is compressed, which generates a large back pressure.. In the case of difficulties in injection molding, injection molding personnel often adopt a method of increasing the injection pressure, which leads to prolonged holding time, delayed molding cycle, reduced production efficiency, increased energy consumption of the injection molding machine, and the like.What is the role of the plastic mold in setting up the exhaust system?

What is the role of the plastic mold in the exhaust system? In the plastic injection molding process, plastic parts often encounter problems such as white, black spots, shrinkage, bubbles, silver, flash, and so on., which is likely to be the exhaust problem of the plastic mold

There are several problems in the use of plunger injection machines for plastic molds. More and more mold factories use plunger injection machines in plastic molds. However, although the plunger injection machine has a simple layout, it has the following three. Questions: 1. Plasticization unevenness The so-called plasticization refers to the process of plastics softening the uniform melt with excellent plasticity by heating and mechanical work in the material, and the movement of plastic in the material of the plunger injection machine. Only rely on the advancement of the plunger. There is almost no mixing effect. Therefore, the outer temperature of the plastic and the barrel and the shunt touch are higher. Due to the poor thermal conductivity of the plastic, the inner layer is not melted when the outer plastic is melted. When the inner layer of the plastic is melted, the outer layer can be degraded by heat for a long time at a high temperature,

Which is more outstanding for the heat-sensitive plastic, the plasticization is not uniform, and the internal stress of the plastic product is large. 2, injection pressure loss large plunger injection machine nominal injection pressure, although high, but because of the pressure at the injection of the plunger, some pressure is required to compact the solid plastic and overcome the frictional resistance between the plastic and the inner wall of the barrel, so The effective pressure transmitted to the cavity cap mould factory is only about 30-50% of the original. 3, the progress of the injection volume is limited because the maximum injection volume of the injection machine depends on the plasticizing ability of the barrel and the diameter and stroke of the plunger, and the plasticization can be related to the heated area of ​​the plastic.

To improve the plasticizing ability, the primary basis is to increase the diameter and length of the material, which will make the plasticization more uneven, and the plastics can be more degraded, so the plasticization can be improved. In addition, during the plunger injection molding, the plastic activity is not ambivalent, and the finishing of the barrel is also difficult. Therefore, the amount of plunger injection is not large, and is usually only 60% or less.

What are the main requirements? The first is on the material produced.. Once the mold is put into production, it means that it needs to accept high temperature stimulation. Engineers design rigorous production requirements when producing such molds. At the time of production, engineers must first select materials strictly.

Most of the plastic molds are made of synthetic Plastic Bottle Mold Manufacturers resin as the main material. For plastic products, the production requires plastic molds. The mold can shape the shape and size of the product. At the same time, the material will continue to rub when it comes into contact with the mold, which requires a lot of friction.

The formation of the shape of the product requires a high temperature for smelting. During the production process, the engineer will design the upper and lower temperature limits of the mold. If you want the appearance and quality of the product to be better, you need to strictly control the performance of the plastic mold. Therefore, the problem of wear resistance of the mold should also be considered when making the mold.What are the requirements for plastic mold making?What are the requirements for plastic mold making? The production of our daily products requires the presence of molds

The material of the mold should be selected according to the size of the production batch of the product; 2 The structure of the mold - reasonable mold structure helps to improve the load carrying capacity of the mold and reduce the bearing capacity of the mold. The normal damage forms of different types of molds are also different, but in general, Plastic household mould/mold suppliers the damage of the working surface is in the form of friction damage, plastic deformation, cracking, fatigue damage, bruises, and the like.. In the actual production process, we must balance these factors according to product parts and objective needs, seize the main contradictions, and obtain the best economic benefits to meet the needs of production.

Mechanical load; 3 Machining quality of the mold - the defects of the mold parts in machining, EDM, hardening and surface treatment will have a significant impact on the wear resistance and anti-seizure ability of the mold; 4 Mould Working state - the accuracy and rigidity of the equipment used, the lubrication conditions, the pretreatment state of the material being processed, the preheating of the mold and the cooling conditions all affect the life of the mold during the working of the mold; The aspects are mutually influential and restrictive. Generally, in the mold design stage, the production batch type or the total number of times the mold is produced, that is, the design life of the mold, should be clarified.What are the main factors affecting the life of the mold?

The life of the mold refers to the total number of parts that can be processed under the premise of ensuring the quality of the parts of the mold, including the sum of the multiple repairs of the working surface and the number of parts processed before and after the replacement of the wearing parts

About plastic mold repair and maintenance About the maintenance of plastic molds can improve the service life and accuracy of plastic molds, and generally do not take maintenance. In the factors affecting the service life of the mold, the use and maintenance accounted for 15%-20%, the service life of the injection mold can reach 800,000 times under normal circumstances, and those well-maintained molds can be extended by 2-3 times. Not paying attention to maintenance, the service life of injection molds is generally short, so it is very important to maintain the mold. Maintenance and repair of plastic molds We have to do the following requirements: standardize cap mould/mold factory the production of molding.

The molding production personnel must have a full understanding of the characteristics of the plastic and the structure of the mold, so that the molding machine corresponding to it can be correctly selected and the low-pressure closed mold, high-pressure mold clamping and molding process conditions can be reasonably adjusted, and the molding die and molding can be performed. The equipment and the molding operation process are subject to necessary management; the maintenance and repair of the mold must be timely, correct and standardized. Once the plastic mold is found to be faulty, it should be repaired in time. If the small problem is not solved, it will often cause big problems. First, we should find the cause of the failure, and then develop a correct repair plan after considering this comprehensively. In the selection of the repair plan, a comprehensive, high-quality, efficient and economical solution should be selected for the maintenance and repair of the mold.

For the daily maintenance of plastic molds. In the ordinary production process, the maintenance of the mold should also be done well. In the maintenance process of the plastic mold, the surface of the cavity is the most important, and the roughness requirement of the surface of the cavity must be ensured, while the need for demoulding is satisfied. It is also not possible to have scratches. It should be cleaned regularly and rust-proofed. A certain amount of lubricating grease should be added to the sliding parts in the mold to ensure flexible starting, and the wearing parts of the mold should be replaced at the right time.