A merge conveyor combines product from two or more infeed lines into a single controlled stream, the opposite of a sorter that divides one line into many. Also called a combiner, it interleaves cartons from multiple lines while controlling gaps and timing so product flows together without collisions or side-by-sides.

Merge conveyor at a glance

A merge conveyor, or combiner, takes product arriving on several lines and brings it together onto one takeaway conveyor in a single file. The merge geometry can be a sawtooth, a sweep, or a brake-belt design, but the work that decides whether a merge runs clean happens upstream, in the gaps. Each infeed line must release cartons with the right spacing and timing so items from different lines interleave instead of colliding or arriving side by side. Side-by-sides cause downstream sorter no-reads and jams, so a merge is paired with gapping conveyors that pull or optimize the gap before product reaches the merge point. Hytrol builds the merge and the gapping equipment that feeds it, and HOJ integrates both to your line rate.

How does a merge conveyor work?

A merge conveyor joins multiple infeed lines at a merge point where the lines converge onto one takeaway belt. Cartons are pre-spaced on the infeed lines, then released so they interleave into a single stream. In a sawtooth merge, angled lines feed the takeaway in sequence; in a sweep or V-belt merge, a belt sweeps product from a side line onto a live roller takeaway; in a brake-belt merge, brake belts meter cartons onto the line. The key to all of them is gap control. A gapping conveyor ahead of the merge runs at a different speed than the line to pull the right gap between cartons, either by blow-through gapping for similar-size product or by optimization gapping that uses sensors to speed up or slow down for mixed sizes.

What types of merge conveyor are there?

Merge designs trade cost against rate and product mix. The table below maps the main types HOJ integrates.

Where are merge conveyors used?

Sorter induction. Combining pick lines into one stream feeding a high-speed sorter.

Order fulfillment. Bringing product from multiple zones together for pack and ship.

Scanning and labeling. Presenting single-file, gapped cartons for print-and-apply and barcode reads.

Shipping consolidation. Joining several lines into one takeaway to a dock or palletizer.

High-mix operations. Merging varied carton sizes with optimization gapping.

Why is gapping critical to a merge conveyor?

A merge is only as reliable as the gaps feeding it. When cartons arrive without correct spacing, items from different lines collide at the merge point or arrive side by side, which jams the line and causes no-reads at the downstream sorter. A gapping conveyor solves this by running at a different speed than the adjacent line to pull a controlled gap. Blow-through gapping uses fixed belt speeds for product of similar size, while optimization gapping uses sensors to speed up or slow down and hold a consistent gap across mixed sizes. Correct gapping is what lets a merge sustain rate without sacrificing accuracy. Note that a merge combines lines into one, the inverse of sortation, which divides one line into many, and the two often sit back to back in a system.

Plan a merge conveyor

HOJ engineers and integrates merge conveyors as an independent integrator, building on Hytrol merge and gapping platforms and matching merge type and gap control to your line rate and product mix. Talk to a specialist.