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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:2022-03-29

          In the mold injection processing, the problem is more prone to shrinkage. Why is that? How can we solve this problem?
          Mold defects
          In this regard, the gate and runner section should be appropriately expanded according to the specific situation, the gate position should be set symmetrically as far as possible, and the feed inlet should be set in the wall thickness part of the plastic parts. If dents and indentations occur further away from the gate, they are usually due to poor melt flow somewhere in the mold structure, impeding pressure transfer. In this regard, the structural size of the casting system should be appropriately expanded, and the runner should be extended to the sunken part as far as possible.
          The machine problem
          If the nozzle hole is too large, the molten material will backflow and shrink. If the nozzle hole is too small, the resistance is too large and the discharge quantity is insufficient. If the clamping force is not enough, the burr edge will shrink, so Ji 'nan injection mold thinks that check whether there is a problem with the clamping system. If the plasticizing quantity is insufficient, the machine with large plasticizing quantity should be selected to check whether the screw and barrel are worn. Machine equipment configuration and maintenance inspection is not careless, processing center, precision carving and other precision mold production equipment, as well as all kinds of injection molding machine, from design to mold injection, each link is strictly controlled, the purpose is to provide more professional, more perfect service.
          The barrel temperature is too high, and the volume changes greatly, especially the temperature of the front furnace. For plastic with poor fluidity, temperature should be appropriately raised to ensure smoothness. Injection pressure, speed, back pressure is too low, injection time is too short, so that the material volume or density is insufficient and the shrinkage pressure, speed, back pressure is too large, too long, resulting in flapping and shrinkage. The amount of feeding, that is, when the cushion is too large, it will consume the injection pressure, too small, the amount of feeding is insufficient. For parts with low precision requirements, after injection, the outer layer is basically condensed and hardened, and the sandwich part is still soft and can be pushed out as soon as possible, so that it can be cooled slowly in air or hot water, and the shrinkage cavity can be smooth, unobtruded and does not affect the use.
          In addition, raw materials do not meet the requirements of molding, the unreasonable structural design of plastic parts is also the reason for the shrinkage phenomenon of injection mold processing, we must pay more attention to all aspects of the line, more exciting content to http://www.lasagnafarm.com our website to understand it!

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