The correct way is to clamp the mold at the same time with the pressure block between the AB plates of the mold base. Unreasonable exhaust requires excessive pressure.

First of all, we must understand that unreasonable exhaust will produce the following disadvantages: 　gas accumulation will erode the mold surface and parting line; 　　2, color problem: color difference occurs, making the color black or bright; 3. The only thing that causes excessive exhaust and blows the front is that the air groove is too deep. Slots, if you must use a spherical milling cutter, you must calculate clearly that the processing depth is consistent with the depth processed by the flat bottom before it can be used. mold. In fact, the opposite direction is correct. One of the most common misconceptions is that too much exhaust will cause the front to blow. A good mold should have good airtightness and ensure the free discharge of gas, rather than the gas being highly compressed. Online pressure compensation.

Deep bone position, column position, small needle dispensing position or thin glue position must be specially considered for exhaust, or use flat thimble, semi-needle structure or exhaust steel, or even vacuum exhaust device. For the molds of the front and rear mold inserts, the front and rear small household appliances OEM mold core materials cannot be closed before the mold base parting surface is closed. Therefore, for safety reasons, we set the standard as 3mm, the exhaust depth depends on the molding material, if in doubt, please refer to the processing specifications. The length of the exhaust seal is the most easily overlooked by most people, and it is related to the proper exhaust , On this issue, there are many different size regulations. Mold exhaust can represent the overall structure of the mold to the greatest extent. Use a flat-bottomed milling cutter to process the exhaust as much as possible.　　

I hope my introduction is useful to you. This is especially important for large plastic parts. It is impossible to make the product meet the standards required by customers; 　 　 5.　　 So what should I pay attention to? A part cannot be exhausted too much, although the parting line can be done, this will bring the following problems related to exhaust: there is not enough steel to bear the pressure on the parting line, and the exhaust is pressed on the parting surface ; The best exhaust will eventually disappear. It makes the work of technicians, QA, operators and mold room personnel more difficult. It will produce too many bonding lines (this bonding is not strong and unsightly ); 　 

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Generally, the temperature in the feeding section of the first stage screw should be higher in order to make the material melt as soon as possible, and the temperature in the exhaust section should be as low as possible within the allowable range. The most prominent, not only low Molecular volatiles, and when in contact with air, it is easy to absorb moisture.　　Exhaust injection molding machine and ordinary injection molding machine are mainly the difference between the pre-plastic process and its plasticized parts. During the operation, production interruption should be avoided as much as possible to prevent material degradation due to long-term stagnation. Exhaust injection molding has significant economic and social benefits: First, it eliminates the attached drying equipment and the plant area occupied by it, reduces the use of electricity for heating and drying, saves energy consumption, and improves the quality of the product, and the appearance quality is good , Dimensional stability, reduce scrap rate.　　

The basic process that the material goes through in the vented barrel is: plastic melting→compression pressurization→melt material decompression→gas expansion in the melt→exhaust→the material after exhaust is compressed again→measure. By the 1970s, the vented injection molding machine began to be developed, and the vented injection molding process was used to process products with high sub-content and volatile matter. In recent years, due to the promotion of energy saving and environmental protection, exhaust injection molding has been raised to a new level.　　4, can be processed and recycled materials and raw materials stored under bad conditions., affecting the external quality, and reducing the mechanical properties of the product, and affecting the internal quality.When many plastics leave the factory, there will be a small amount of monomers, fluxes and other low molecular volatiles, such as nylon (PA), polymethylmethacrylate (PMMA), polycarbonate (PC), etc.　　2.　　The advantages of vented injection molding: 　　1, can remove volatile substances to a minimum, improve the mechanical properties of the product, and improve the appearance quality.　　

Process notes: 　　1, the most important parameter of the exhaust injection molding process is the temperature of the barrel, especially the temperature of the decompression section.. Therefore, ordinary injection molding must be dried.　　3, the material does not need to be dried, reducing drying equipment, saving time and saving electricity. Monomers, solvents, and moisture will Plastic Injection Molded Automotive Parts turn into gases at the processing temperature, causing difficulties in processing, producing silver wires, stains, clouds, bubbles, etc.　　2, reduce defective products and increase production capacity

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