Precision Engineered for PET Blow Molding
At BJY Precision in Foshan, we’ve been making core rod heads since 2011. These aren’t just metal parts – they’re what keep your bottle production running smooth day after day. I’ve seen how the right core rod can cut downtime and improve bottle quality. Our team builds each one to handle the tough conditions inside your blow molder.
Built from What Works
After testing different steels, we settled on specific grades that hold up. They take the heat without softening and handle the friction without wearing down fast. The heat treatment process we use isn’t fancy – it’s just proven to work. These rods keep their shape through millions of cycles, and that consistency matters when you’re trying to hit production targets.
Made to Match Your Machine
The standard size is 26.3 millimeters across by 62 long, but we adjust as needed. We’ve made versions for most major equipment brands – Sidel machines, Krones lines, you name it. What matters is the fit. Our machining ensures the rod sits right and moves right in your setup. We check dimensions twice because even a little off causes problems.
What You’ll Notice On Your Line
Fewer Jam-ups – The rod centers the preform properly so it doesn’t stick or misalign
Better Bottle Walls – Material stretches evenly instead of getting thin spots
Cleaner Air Flow – Air spreads uniformly for faster, more complete expansion
Neater Neck Finish – Bottle mouths form clean for reliable capping
Less Changing Parts – These hold up longer between replacements
Where They Fit
Our customers use these for:
Water and soda bottles
Cooking oil containers
Shampoo and cleaner bottles
Pharma and cosmetic packaging
Why Companies Come to BJY
There are bigger suppliers, but here’s what we hear from customers who stick with us:
We answer the phone – You talk directly with people who know the product
We fix problems – If something doesn’t work right, we figure out why
We make what you need – Not just catalog items, but modified versions
It’s consistent – Order today or next year, the quality stays the same
Visit bjypetmould.cn for drawings and specs our engineers use. Better yet, send us your requirements and we’ll suggest what actually works.
How It Functions
Here’s the straightforward version: The rod goes inside the warm plastic preform, giving it an internal shape to form around. When air blows in, the plastic expands against the mold walls. The rod’s profile controls how that expansion happens – too fast and walls get thin, too slow and you waste cycle time. It’s a balancing act we’ve gotten good at over thousands of customer orders. The right rod means bottles form properly every time, with necks that seal and walls that don’t fail.
