提高塑料袋透明度在模具上要采用什么措施? - 常见问题

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提高塑料袋透明度在模具上要采用什么措施?

发布日期:2019-07-04 作者:www.edkiller.com 点击:

  对设备及模具的要求,注塑工艺及产品的原材料加工,讨论注意事项:
  Requirements for equipment and moulds, injection moulding process and raw material processing of products are discussed.
  由于塑料袋中存在任何微量杂质,原料的制备和干燥可能会影响产品的透明度,因此储运。
  Because there are any trace impurities in plastic bags, the preparation and drying of raw materials may affect the transparency of products, so storage and transportation.
  在喂料过程中,必须小心密封并确保材料是干净的。特别是原料中含有水,加热后会变质。因此,它必须干燥和干燥漏斗必须用于成型。同样重要的是,在干燥过程中,应优先过滤和除湿的空气输入,以确保它不污染原料。
  During the feeding process, care must be taken to seal and ensure that the material is clean. Especially when the raw material contains water, it will deteriorate after heating. Therefore, it must be dry and dry funnel must be used for moulding. It is also important to give priority to air input for filtration and dehumidification in the drying process to ensure that it does not pollute raw materials.
  清洗管道、螺丝及配件
  Cleaning pipes, screws and accessories
  为了防止原材料的污染和旧材料或杂质的存在而压下螺丝及附件,特别是树脂具有较差的热稳定性。因此,在使用前和使用后,请使用螺旋清洗机清洗杂物,使其不附着杂质。当没有螺丝清洗剂时,使用PE、PS等树脂清洗螺丝。
  In order to prevent the pollution of raw materials and the existence of old materials or impurities, screw and accessories, especially resin, have poor thermal stability. Therefore, before and after use, please use the screw cleaner to clean the impurities, so that they do not adhere to impurities. When there is no screw cleaner, use PE, PS resin to clean the screw.
  临时停机时,为防止物料在高温下长期下落,应降低干燥机和筒体温度,如PC、PMMA等管体温度应降低至160℃以下。(PC料斗温度应低于100℃)
  When temporary shutdown occurs, in order to prevent material from falling at high temperature for a long time, the temperature of dryer and cylinder should be lowered, such as PC, PMMA, etc. the temperature of tube body should be lowered below 160 C. (PC hopper temperature should be below 100 C)
  模具设计中的问题(包括产品设计)
  Problems in Die Design (including Product Design)
  为了防止回流不良或冷却不均匀导致外观塑性差,导致表面缺陷和变质;
  In order to prevent poor reflux or uneven cooling resulting in poor appearance plasticity, resulting in surface defects and deterioration;
  一般在模具设计中,应注意以下几点:
  In general, the following points should be paid attention to in die design:
  壁厚应尽可能均匀,剥离坡度应足够大;
  The wall thickness should be as uniform as possible and the stripping slope should be large enough.
  这种转变应该是渐进的。平稳过渡,防止尖角。锋利的边缘产生,特别是PC产品必须没有间隙;
  This shift should be gradual. Smooth transition to prevent sharp corners. Sharp edges, especially PC products, must be free of gaps.
  门口。通道应尽可能的宽和短,浇口位置应根据收缩和凝结过程来设置。如有必要,应增加冷井。
  Doorway. The passage should be as wide and short as possible, and the gate position should be set according to the shrinkage and condensation process. If necessary, additional cold wells should be added.
  模具表面应光滑,粗糙度低(最好小于0.8);
  The surface of the die should be smooth with low roughness (preferably less than 0.8);
  排气。储罐必须足够及时地从熔体中排出空气和气体;
  Exhaust. The tank must discharge air and gas from the melt in sufficient time.
  除PET外,壁厚不宜过薄,一般不小于LMM。
济南塑料袋
  Except for PET, wall thickness should not be too thin, generally not less than LMM.
  注塑过程中注意事项(包括注塑机要求)
  Notes in Injection Molding Process (Including Injection Molding Machine Requirements)
  为了减少内应力和表面质量缺陷,在注塑过程中应注意以下几个方面:
  In order to reduce the internal stress and surface quality defects, the following aspects should be paid attention to in the process of injection moulding:
  应选用带有专用螺丝和独立温控喷嘴的注塑机;
  Injection moulding machine with special screw and independent temperature control nozzle should be selected.
  在塑料树脂不分解的前提下,注射温度应较高;
  On the premise that the plastic resin does not decompose, the injection temperature should be higher.
  注塑压力:一般较高,克服了熔体粘度大的缺点,但较高的压力会产生内应力,导致模具释放困难和变形;
  Injection pressure: generally higher, overcome the shortcomings of high melt viscosity, but higher pressure will produce internal stress, resulting in difficult release and deformation of the die;
  注射速度:在满足充填方式的情况下,注射速度一般较低,宜采用多级注射速度。
  Injection speed: In the case of filling mode, the injection speed is generally low, and multi-stage injection speed should be adopted.
  压力保持时间和成型时间:充填满意不会产生凹陷和气泡;它应该尽可能短,以尽量减少花在保险丝上的时间;
  Pressure retention time and forming time: Satisfactory filling does not produce depressions and bubbles; it should be as short as possible to minimize the time spent on fuses;
  螺杆转速和背压:在满足塑化质量的前提下,应尽可能降低减压的可能性;
  Screw speed and back pressure: On the premise of satisfying the plasticizing quality, the possibility of pressure reduction should be reduced as much as possible.
  模具温度:对产品冷却质量、质量有很大影响。因此,模具温度必须能够准确地控制工艺。模具温度应尽可能高。
  Mold temperature: It has a great influence on the cooling quality and quality of products. Therefore, the die temperature must be able to accurately control the process. Mold temperature should be as high as possible.
如果您有济南塑料袋的需求可以点击我们的官网进行咨询:http://www.edkiller.com
If you need plastic bags in Jinan, you can click on our official website to consult: http://www.edkiller.com.


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