Our Practical Tips on Mold Clearance for Burr-Free Metal Cap Threads

I've been working on the floor of our Yantai Kunpeng factory for over 8 years, and I've talked with dozens of overseas customers about one tricky problem, annoying burrs on metal screw caps. It's not just a small flaw, those tiny burrs make caps hard to screw on smoothly, ruin sealing effects, and even scratch the inner liners, which no brand wants for their packaging.

Lots of customers ask us how to fix this, and from our hands-on production experience, it all comes down to mold clearance matching. I've stood by our production lines and watched test runs countless times, if the clearance is too tight for the aluminum or tinplate thickness, the metal cracks easily, if it's too wide, the threads come out loose and won't seal properly, it's all about finding that precise balance, not a one-size-fits-all setting.

We tailor our precision-ground alloy molds with calculated clearance, matching the 0.2-0.8mm metal sheets most customers use. After months of real batch production tests, this small but careful adjustment cuts burr defects down to less than 0.3%, the threads turn smoothly, and the tamper-proof grooves stay fully intact.

This isn't some fancy technical gimmick, it's just the practical detail we've perfected after years of making cap processing equipment. For us, it's the little on-site tweaks like this that make real production stability, not empty technical claims, it's how we help our customers avoid costly defective caps and keep their production running steadily.