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Injection Molding Mold Temperature Control Principle
Aug 14, 2017

  Injection Molding Mold Temperature Control Principle

  The temperature of the injection mold has a great influence on the filling flow, solidification, production efficiency and the shape and dimensional accuracy of the plastic melt.

  Each plastic injection molding has a reasonable mold temperature area, so that the melt flow is easy to fill the cavity, plastic parts after stripping and warping deformation small, stable size, mechanical properties and surface quality is also high. To control the temperature of the mold, you must design the temperature adjustment system, the general use of mold cooling or heating method, if necessary, both, the use of mobile phone shell mold cooling device more.

  1. the need for temperature regulation

  Mold temperature on the plastic parts of the molding quality, forming efficiency has a greater impact. In the higher temperature of the mold, Injection Molding the molten compound of the fluidity is better, is conducive to the compound filling cavity, access to high-quality plastic surface appearance, but will make the material curing time longer, For the crystalline compound, it is more conducive to the crystallization process, to avoid the storage and use of plastic parts in the size of change; in the lower temperature of the mold, the melt compound is difficult to fill the cavity, resulting in increased internal stress, , Resulting in silver, weld marks and other defects.

  Different materials have different processing technology, and a variety of plastic parts of the surface requirements and structure is different, in order to produce the most effective time to meet the quality requirements of the plastic parts, Injection Molding which requires the mold to maintain a certain temperature, mold temperature The more stable, the production of plastic parts in the size of the shape, the appearance of the quality of plastic parts and other requirements more consistent. Therefore, in addition to mold manufacturing factors, the mold temperature is an important factor in the control of the quality of plastic parts, mold design should take full account of the mold temperature control method.

  2. Mold temperature control principle

  In order to ensure that the most effective time to produce high quality appearance requirements, dimensional stability, Injection Molding deformation of small pieces of plastic, the design should be clear understanding of the basic principles of mold temperature control.

  ① different materials require different mold temperature.

  ② different surface quality, different structure of the mold requires a different mold temperature, which requires the design of temperature control system with targeted.

  ③ the temperature of the former mold is higher than the temperature of the mold, under normal circumstances the temperature difference of 2 ~ 3 º or so.

  ④ the requirements of the mold before the mold temperature than the general requirements of the former mold temperature is high, the current mold to pass hot water or hot oil, the general temperature difference of about 40 º.

  ⑤ When the actual mold temperature can not meet the requirements of mold temperature, the mold should be heated, so the mold design, should take full account of the material into the mold heat can meet the mold temperature requirements.

  ⑥ from the mold into the mold heat in addition to heat radiation, heat conduction way consumption, Injection Molding the vast majority of heat by the circulation of the heat transfer medium out of the mold.

  ⑦ mold temperature should be balanced, Injection Molding can not have local overheating, too cold.