Jetting: the invisible issue that weakens your parts from within.

A surface defect that can turn a good part into scrap. It looks like snake-like, wavy lines on the surface of molded components. But it’s not just a cosmetic flaw, it can indicate deeper structural issues.

Jetting occurs when molten plastic enters the mold cavity at such high velocity that it doesn’t have time to adhere to the mold walls. Instead, it shoots forward and folds over itself, disrupting surface finish and weakening the part. This typically happens when the gate is too small or poorly positioned, directing the polymer into open space rather than against a mold surface.

A common solution is to reduce the initial injection speed. Slowing the flow allows the material to spread more uniformly. Another technique is multi-stage injection: starting slow and ramping up once the cavity begins to fill.

But at ADIS Tachov s.r.o., we take it a step further. Our design team tackles jetting at the root, optimizing gate type and placement from the start. By using fan or tab gates to distribute flow and aiming the melt against mold features, we promote smooth spreading and eliminate the risk of jetting.

We also deploy smart sensors and other techniques across our facilities to monitor flow front velocity, pressure, and temperature in real time. This lets us adjust the process mid-cycle and maintain perfect consistency with every part that leaves the machine.

Are you developing a new component? Let’s talk. Jetting is just one of many preventable defects that our team can help you design for perfection. 🦾