Choosing a bale size your buyer and your grab agree on

Bale size looks like a detail until the first truck arrives at the mill and the load is rejected — or until you realise the bales you produce are too heavy to handle with the grab you own. Three numbers decide it: the bale section, the bale length, and the density you actually achieve with your material.

Why the bale section matters more than the tonnage

The Y81 series spans bale sections from 500 mm up to 700 mm square. Two machines with the same hourly output can produce different bales, and the bale is what your customer buys.

A mill that charges by weight does not care. A mill that charges by volume, or a foundry feeding a specific furnace opening, does. So does your own handling equipment: a 700 mm bale needs a bigger grab and a bigger forklift than a 500 mm bale.

The three constraints, in order

1. What your buyer accepts

Ask before you buy the machine. Mills and foundries often specify a maximum bale dimension and a density range. If you produce outside it, the load is downgraded or rejected — and that is a permanent cost, not a one-off.

2. How you will load it

Bale weight = section × length × density. A 500 mm bale can be lifted by a small grab and a standard forklift. A 700 mm bale at the same length is roughly twice the weight, and both your grab and your truck payload have to match.

3. How the trucks load

Bales stack well, which is why a baler pays for itself. But the loading pattern depends on the bale shape: square bales stack and strap cleanly; long bales fill a container faster but are harder to handle individually.

What actually changes the density

The machine sets the force; your material sets the result. Light, springy material — aluminium cans, thin sheet, turnings — compacts less than heavy plate offcuts at the same pressure. Two buyers with the same machine and different material get different bale densities, and that changes the weight per truck.

This is why a baler quote should be sized against the material, not against the machine’s maximum force. A baler working at half its capacity produces bales that hold together; one running at its limit produces bales that spring open on the dock.

A simple way to specify it

• Write down the maximum bale size your buyer accepts.
• Write down the weight your grab and forklift can handle.
• Pick the section that satisfies both.
• Then choose the model whose force and motor produce that section at your daily volume.

Questions buyers ask

Can the bale length be adjusted?

Yes, within a range, and it is set during commissioning. It is worth deciding before the machine is installed rather than after the first shipment.

Is a bigger bale always cheaper to ship?

Per tonne, usually yes. Per bale, it costs more in handling equipment. If you handle bales by hand or with a small loader, the handling limit arrives before the shipping saving does.

What if my material changes?

Then the density changes and the bale weight changes with it. Keep the section and adjust the length, or expect to re-tension the press. This is a normal operating adjustment, not a machine fault.