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      1. 歡迎訪問濟南立強模具有限公司!



        來源:http://www.lasagnafarm.com/ 日期:2021-10-19

        Injection molded parts are the general name of injection molded products produced and processed by injection molding machines, which are applied in many industries. However, in the process of design and processing, in order to ensure the quality of products, there are many precautions. Let's share it with you.
        1. Design considerations
        In order to prevent poor plastic molding due to poor reflux or uneven cooling, and then cause product surface defects, the following points should be paid attention to in the design:
        (1) The surface of the die shall be smooth with low roughness (lower than 0.8 as far as possible);
        (2) The wall thickness shall be as uniform as possible, and the demoulding slope shall be large enough;
        (3) Except pet, the wall thickness should not be too thin, generally not less than LMM;
        (4) The gate and runner shall be as wide and short as possible, and the gate position shall be set according to the shrinkage and condensation process, and the cold charging well shall be added if necessary;
        (5) The vent slot must be sufficient to discharge the air and gas in the melt in time;
        (6) The transition part of injection molded parts shall be smooth and transition gradually to prevent sharp corners and sharp edges, especially PC products must not have gaps.
        2. Precautions for injection molding process
        (1) Injection speed: when the mold filling is satisfied, it should generally be low, and multi-stage injection of slow, fast and slow should be adopted as far as possible;
        (2) Special screw and injection molding machine with separate temperature control nozzle shall be selected for processing;
        (3) Screw speed and back pressure: on the premise of meeting the plasticization quality, it shall be as low as possible to prevent degradation;
        (4) Injection pressure: generally high to overcome the defect of high melt viscosity, but too high pressure will produce internal stress, resulting in difficult demoulding and deformation;
        (5) Pressure holding time and forming cycle: it shall be as short as possible to reduce the residence time of molten material in the barrel under the condition of meeting the product mold filling and no depression and bubble;
        (6) Under the premise that the plastic resin does not decompose, the injection temperature should use higher injection humidity;
        (7) Mold temperature: the cooling of injection molded parts has a great impact on the quality, so the mold temperature must be able to accurately control the process. If possible, it is better to have a higher mold temperature as much as possible.

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