Conveying Systems for Bottling Plants — Air, Chain and Table-top

1. The role of conveying

The conveyor is the line's nervous system: it moves the bottle from station to station, buffers the flow and sets the line's rhythm. The design is a layout decision — the sections, the buffers and the transfers — and the technology choice follows the bottle and the section. A line is a sequence of conveyor technologies, not one conveyor; the skill is choosing which section gets which.

The conveyor also decides handling damage: bottle-to-bottle contact, transfer points and accumulation all mark or break bottles, and the design is as much about the bottle as the speed.

2. Air conveyors

Air conveyors move empty PET bottles on a cushion of air between the blow moulder and the filler — no chain contact, light handling, high speed and low friction. The technology suits the empty-bottle section, where the bottle is light, the speed is high and contact wear and scuffing must be avoided. Air conveying needs a clean, controlled air supply — a utility the design accounts for.

Air conveyors are the modern standard for the PET blow-to-fill section — and they are specified with the blow moulder and the filler as one system.

3. Chain conveyors

Chain conveyors are the rugged generalists: a continuous chain carries the bottles, handles heavy loads, supports flexible layouts and survives the harsh end of the line — filled bottles, packers and the palletiser. They cost less than air and are easier to maintain, at the price of more contact and wear. Most of a line's length is chain — it is the workhorse, not the exception.

For flexible layouts and multi-product lines, chain is the pragmatic choice — the wear parts are cheap and the maintenance is simple.

4. Table-top conveyors

Table-top conveyors use small, precision chains running on a flat table — low friction, precise bottle position, ideal for infeed, inspection and the filler's approach where position matters. They sit between the air section and the general chain section, giving the precision that labelling and filling infeed need without slowing the line.

The table-top section is where the bottle's position decides the machine's performance — a labeller or filler fed by a sloppy conveyor runs at half its rating.

5. The comparison

The technologies complement, not compete — the line runs air to the filler, table-top at the infeed, and chain through the rest.

6. Handling and damage

Handling damage is the conveyor's hidden cost: bottle-to-bottle contact scuffs or cracks, transfer points drop or jam, and accumulation marks the bottle. The design answers with gentle transfers, controlled accumulation and the right technology per section — and with lightweight bottles, the handling spec is part of the bottle's survival. A line designed around the lightest bottle it will run is a line that handles it.

Ask for the handling design in the proposal: transfer types, accumulation control and the bottle spec the line is designed around.

7. Designing the layout

The layout is the conveyor design: the bottle path, the buffers between stations and the transfers decide the line's efficiency and its damage rate. Shorter paths mean less conveyor, less energy and fewer damage points; logical buffers mean the line absorbs stoppages without starving. The layout is drawn with the supplier before the order — and the drawing is where a supplier's experience shows.

The conveying design ties the whole line together — the filling machine, the packaging and the palletiser are connected by it, and the layout is the line's skeleton.

Frequently asked questions