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Gas assisted injection molding equipment

  Brief description of gas auxiliary equipment             

Due to the technical characteristics of gas assisted injection molding, high-pressure gas must be injected into the product during the plastic molding process, so inert gas must be used to avoid plastic oxidation reaction. Nitrogen is an economic and safe inert gas in the industrial field.

The auxiliary gas injection system should be complete A High pressure nitrogen source equipment B High pressure nitrogen transmission pipeline and C Gas assisted pressure controller It consists of three parts.


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A Description of high pressure nitrogen gas source equipment:

According to the process requirements of general gas auxiliary products, A High pressure nitrogen The selection of source should meet three basic requirements: pressure, gas volume and purity

① Pressure requirements: according to the process pressure requirements of gas auxiliary products, the maximum pressure of nitrogen generated by high-pressure nitrogen gas source equipment should reach 350bar And must be able to automatically adjust to meet the production requirements;

② Gas requirements: according to the actual production process experience of gas assisted products, the supply of high-pressure nitrogen is directly related to the production quantity of gas assisted dies

③ Purity requirements: according to the general situation of gas auxiliary product materials, the purity of high-pressure nitrogen can reach ninety-nine %It can ensure the normal gas assisted process of all materials.

At the same time, according to the special requirements of gas assisted process, A High pressure nitrogen The selection of source should also pay attention to the following process requirements:

④ The high-pressure nitrogen compressor is directly related to the stable state of the whole equipment. If possible, the high-pressure nitrogen compressor with larger displacement should be selected as far as possible to avoid overload due to insufficient capacity of the compressor. Once the compressor is shut down for maintenance, the whole plant production will be affected

⑤ High pressure nitrogen compressor is the key link of nitrogen gas source. If nitrogen is polluted by oil during high-pressure compression and cannot be removed, all products will be scrapped. Therefore, it is necessary to ensure that the quality of nitrogen is not polluted by compression. Therefore, high-quality diaphragm type high-pressure nitrogen compressor for gas auxiliary should be selected as far as possible.

⑥ If conditions permit, the scheme of self-produced low-pressure nitrogen should be selected as far as possible, so that the purity, quality and gas volume of nitrogen obtained can be guaranteed. For self-produced nitrogen, the compressed air treatment system must have a perfect refrigerant monitoring system; the nitrogen generator should choose the PSA double tower mode as far as possible.

B Description of high pressure nitrogen pipe network

According to the standard injection molding workshop design, users are recommended to choose standard φ eight The specification of high pressure resistant pipe network is used to transport high-pressure nitrogen. Meanwhile, high-pressure nitrogen outlets are installed around the injection molding machines with production conditions, so as to ensure the use conditions of multiple injection molding machines for auxiliary gas preparation process;

C Gas auxiliary pressure controller explain:

According to the characteristics of gas assisted products, the number of cavity can be determined according to the number of air assisted die one two four In this paper, we choose to use the corresponding single, double or four way gas assisted pressure control equipment with gas assisted mold production.

When the gas assisted die with nozzle inlet is used for gas assisted process, the corresponding single pressure control equipment can be used to cooperate with the gas assisted die for production.

 

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