Time to read: 4 min
Flash. It’s what you get when there’s a problem with your injection mold or with the注塑成型processitself. Although flash can be addressed during后期处理，您可以决定首先防止模具闪光更好。这通常是工具成本的函数，因为无闪光模具更昂贵。
部分designers and engineers, it’s important to understand what flash is and why it occurs so that you can prevent, or at least minimize it. Partnering with an experienced injection molder is part of the solution, but you’ll also have to make decisions about the amount of flash you’re willing to accept since there are tradeoffs between quality and costs.
What is Mold Flashing?
模具闪光灯或闪光，是多余的塑料，在注塑部件的表面上形成。这种不需要的材料通常在分离线上被迫离开模腔，但也可以从其他位置出现。
尽管一定量的闪光灯被认为是模塑过程的正常部分，但过量的闪光灯可以将零件的表面光洁度或干扰部分座椅，配合或组装。
导致闪烁的原因是什么？
闪光的原因很多，包括分组线不匹配，通风不当，低夹紧压力，低粘度和不均匀流动。其中一些问题与工具有关，但其他问题是处理的函数。
- Parting Line Mismatches–Dust,污垢，污染物和残留物可以保持注塑模具的一半正确闭合。佩戴的模腔也不会紧紧配合在一起。压力还可以使模具板的金属表面变形，复杂的部分几何形状可以复杂化闭合。
- Improper Venting–通风口that are old and worn may fail to meet required tolerances and allow too much or too little air to escape. Vents that aren’t deep enough may allow stiffer plastics to protrude and vents that aren’t thin enough may allow more fluid materials to pass through.
- 低夹紧压力–注塑包装/保持阶段确保腔完全填充，但也可以打开模具。如果夹紧压力不足以抵抗该力，即使模具一半紧固在一起，塑料也可能从模具中泄漏。
- Low Viscosity and Uneven Flow- 加工条件可能导致塑料太易于流动或过度填充模具。实例包括熔体温度过高，过度的停留时间过长，干燥不足的残留水分，以及过量使用冷却剂。
闪存预防和减少
可制造性设计(DFM) is a key aspect of flash prevention and reduction. For example, plastic injection molding guidelines recommend placing the parting line along the part’s edge rather than on a flat surface to improve the part’s appearance and function. This not only helps to hide the seam, but it also reduces the chances of flash formation.
During the design phase, your part drawing can indicate how much or how little flash you will accept. There are two measurements to consider. Flash extension measures how much it projects from the plastic part along the mold’s parting line. Flash thickness measures perpendicular to the parting line instead. The location of flashing is also important and can tell you when you designed a parting line in the wrong place.
Reducing flash extension and flash thickness improves part quality but increases your mold costs and part costs. If your flash removal requirements are strict, you can specify a flash-less mold so that your plastic parts have only minimal flashing. This type of mold candouble or triple然而，您的工具成本如此，在后处理期间闪光删除可能更具成本效益。
If your injection molder is usingexisting tooling，模具维护和工艺改进可以减少闪烁。例如，在分离线不匹配的情况下，溶液可以是校正夹紧未对准，检查腔或清洁模具表面。如果夹紧吨位太低，注射模塑商可能需要减少包装/保持压力或使用具有更高夹紧力的机器。
Are You Ready to Fight Flash?
就像高峰时的时间不可避免地意味着道路上的更多交通，闪光是注塑过程的不可避免的一部分。然而，通过阅读前方有问题的迹象，您可以防止闪光从转变为花费您的时间和金钱的众所周知的交通堵塞。无闪光的工具意味着支付更多前期，但投资回报可能最终值得。
If flash-free tooling is too expensive, or if you’re using existing tooling, then the solution could be multifactorial — improving your part design, requesting mold cleaning or maintenance, talking to your injection molder about making process improvements, or using different equipment can all help get you the results you need.
有很多事情可能会出错并增加闪烁，但熟练的伙伴可以做正确的事情。这就是为什么虚构是下一个塑料的聪明选择注塑成型project. We have the resources, know-how, and production network to tackle flashing issues and deliver the quality injection molded parts you need.创建一个帐户and get an instant quote today!
