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Broken Needle in Your Shoe? This Factory Makes Sure That Never Happens

Product: Black insoles and shoe components
The problem: Broken needles are invisible on dark material
The fix: Yiwan 805 needle detector

The Problem

Insoles go through stitching, molding, and assembly. Every step that uses a needle or a stapler is a chance for a piece of metal to stay behind.

On a black insole, you'll never see it. A white fabric might show a dark spot — black material hides everything.

But the needle is still there. And a shoe with a broken needle inside is a product that can't be sold. Or worse, it gets sold, and the customer finds it the hard way.

What We Did

We installed a Yiwan 805 needle detector in the insole finishing area, right before packing.

The worker places each insole onto the green conveyor belt. The belt carries it into the detection tunnel, where the machine checks it with a magnetic field. Steel and iron — even a tiny needle fragment — interrupt that field, and the machine knows.

How It Works on the Line

Each insole goes onto the belt, one by one
It moves into the tunnel — the check takes about a second
Green light: clean, the insole keeps moving to packing
Red light: metal detected — the machine stops and alerts, and that piece is pulled out

The machine doesn't care that the insole is black. It doesn't look with eyes. It looks with a magnetic field — and that can't be fooled by color.

Why This Matters

Most shoe exporters face the same question from buyers: "Do you have needle detection?" If the answer is no, the order doesn't come.

A needle detector isn't a cost. It's the ticket to the order. For this factory, one machine at the end of the line keeps every batch sellable — and every buyer satisfied.