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Injection molding process

A technology of injection molding process and process steps, applied in the direction of coating, etc., can solve the problems of affecting plastic fluidity, complex process, poor mechanical properties at weld lines, etc., and achieve good internal structure consistency, high surface brightness, and mechanical properties excellent effect

Inactive Publication Date: 2009-11-18
李永能
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Problems solved by technology

[0002] In the injection molding industry, some products require high surface brightness to make the surface more beautiful, such as the front panel of the air conditioner shell, the front panel of the TV set, the surface of the printer shell, etc. The traditional process is to perform surface treatment on the product after injection molding, so that To meet the requirements of brightness, the process is complicated, there are many processes, and pollutants are generated during surface treatment; in addition, during the injection molding process, when molten plastic flows in a mold cavity with a lower temperature, its temperature will drop, affecting the fluidity of the plastic , the plastics flowing into the mold cavity from different sprues will produce weld lines at the confluence, and the mechanical properties of the weld lines after product molding are very poor. When this traditional injection molding process encounters uneven product wall thickness, due to its Shrinkage is different, resulting in very large dimensional errors in the thickness transition zone

Method used

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  • Injection molding process

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Embodiment Construction

[0008] Now set forth the present invention in detail in conjunction with accompanying drawing:

[0009] The injection molding process steps of this embodiment are: 1) soften the water first, and steam it through a steam boiler; 2) send water vapor to the water channel in the mold through the control of the valve controller, so that the mold is heated to a temperature close to the melting temperature of the plastic and kept warm; 3) Inject high-temperature molten plastic into the mold; 4) After the molten plastic fills the entire mold cavity, the valve controller turns off the delivery of water vapor and transfers cooling water to the water channel to cool the mold; 5) Open the mold to take the finished product.

[0010] The embodiments described above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent changes made according to the principle of the present invention should be covere...

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Abstract

The invention relates to an injection molding process, which comprises the following processing steps: 1) conveying water vapor into a water passage in a mould to make the mould raise temperature and maintaining the temperature; 2) injecting high-temperature molten plastics into the mould; 3) conveying cooling water into the water passage; and 4) opening the mould to obtain a finished product. The water vapor is firstly softened by a water softener before entering the water passage. The process has the advantages that: after the product is formed, the product has high surface gloss, does not need surface treatment anymore, has good internal structural integrity of a wall body material, does not have the problem of a welding line, and has excellent mechanical property and consistent shrinkage factor.

Description

Technical field: [0001] The invention relates to an injection molding process. Background technique: [0002] In the injection molding industry, some products require high surface brightness to make the surface more beautiful, such as the front panel of the air conditioner shell, the front panel of the TV set, the surface of the printer shell, etc. The traditional process is to perform surface treatment on the product after injection molding, so that To meet the requirements of brightness, the process is complicated, there are many processes, and pollutants are generated during surface treatment; in addition, during the injection molding process, when molten plastic flows in a mold cavity with a lower temperature, its temperature will drop, affecting the fluidity of the plastic , the plastics flowing into the mold cavity from different sprues will produce weld lines at the confluence, and the mechanical properties of the weld lines after product molding are very poor. When t...

Claims

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Application Information

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IPC IPC(8): B29C45/00B29C45/73
Inventor 李永能陈长
Owner 李永能
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