Plastic Viscosity Test Method
A test method and plastic technology, applied in the field of injection molding, can solve the problems of inaccurate determination of injection parameters, affecting the quality of injection products, and achieve the effect of improving quality
Active Publication Date: 2019-07-05
深圳市华讯方舟光电技术有限公司 +1
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Problems solved by technology
[0006] The purpose of the present invention is to provide a plastic viscosity test method to solve the technical problem in the prior art that the injection molding parameters cannot be accurately determined during the injection molding process and affect the quality of the injection molding product
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[0046] Furthermore, as a specific implementation of the plastic viscosity test method provided by the present invention, the continuous injection molding of multiple beers includes: injecting 10 beers and obtaining 10 sets of data. In other embodiments, multiple sets of data such as 8 sets, 9 sets, and 11 sets can be obtained, depending on actual conditions, and are not limited to the examples listed in the present invention.
[0047] Further, as a specific implementation of the plastic viscosity test method provided by the present invention, the continuous injection of multiple beers, recording the injection time of the last beer, the pressure of the pressure switch point and the position of the screw includes: When the glue speed and injection pressure are at the maximum value, three beers are injected continuously, and the injection time of the third beer, the pressure of the switching point of holding pressure and the position of the screw are recorded. Since the injection...
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The invention provides a plastic viscosity test method, which belongs to the field of injection molding technology, including setting the melting temperature and mold temperature; adjusting the injection speed and injection pressure to the maximum value allowed by the injection molding machine; setting the pressure holding switching mode to position switching , adjust the injection pressure, so that the cavity is filled with 95%-98% of the plastic melt; continuous injection of multi-beer, record the injection time of the last beer, the pressure of the pressure switch point and the position of the screw; and then continuous injection of multi-beer, The injection speed of each beer is lower than that of the previous one. Record the injection time of each beer, the pressure of the pressure switch point and the screw position; observe the change of plastic viscosity through the change of injection speed to find out the plastic viscosity. The injection speed range when the property change is the smallest, the injection speed range is the best injection speed range. The plastic viscosity test method provided by the present invention gradually reduces the injection speed, observes the viscosity change of the molten material in the mold cavity, finds out the optimal injection speed range corresponding to the plastic, and designs the optimal process parameters.
Description
technical field [0001] The invention belongs to the technical field of injection molding, and more specifically relates to a method for testing the viscosity of plastics. Background technique [0002] Injection molding is the process of injecting the plasticized molten state (ie, viscous fluid state) plastic into the closed mold cavity with the help of the thrust of the screw (or plunger), and obtaining the finished product after curing and shaping. With the increasing application of plastic products and the rapid development of injection molding technology, people have higher and higher requirements for plastic parts. The rationality of injection molding process plays a key role in the quality and reliability of product molding. [0003] Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding—melt plasticization—pressure injection—mold filling and cooling—mold opening and pick-up. After taking out the plastic parts, the mold is closed ag...
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IPC IPC(8): B29C45/76
CPCB29C45/7646B29C2945/7605
Inventor 李进刘俊杰詹宇昕
Owner 深圳市华讯方舟光电技术有限公司