Stand next to a running bottle cartoner and it looks like one continuous blur: bottles in one end, sealed cartons out the other, eighty times a minute. Slow it down, though, and you’ll find six distinct mechanical stages happening in strict sequence — all driven by a single synchronized main shaft. This article walks through each stage using a real machine as the reference: the HIJ-130B automatic bottle cartoning machine, a 30–80 cartons/min intermittent-motion horizontal cartoner. If you’re still deciding whether you need one at all, start with our primer on what a bottle cartoning machine is.

The Master Principle: One Shaft, Perfect Timing

Before the six stages, understand the one design decision that makes them reliable. An intermittent-motion cartoner does not use six independent motors that a computer tries to keep aligned. It uses one main motor (1.5 kW on the HIJ-130B) driving an indexing gearbox and a set of cams. Every station — feeder, erector, folder, pusher, sealer — takes its motion from the same rotating shaft. When the operator raises the speed on the touchscreen, a Siemens SINAMICS V20 frequency drive speeds up that one shaft, and every station accelerates together in perfect phase.

An Omron rotary encoder on the shaft tells the Siemens S7-200 PLC exactly where the machine is in its cycle at every millisecond. That position signal is what lets the PLC know when to fire each sensor check and which carton to reject two stations later. Mechanical synchronization does the moving; the PLC does the watching.

The Six Stages, Station by Station

Stage 1

Bottle Infeed & Indexing

The bottle feeder — the module that makes hands-free bottle cartoning possible.

Filled, capped bottles arrive from your labeler on a conveyor. The bottle feeder system gates them one at a time and places each into a pocket of the moving product chain, upright and correctly spaced. A photoelectric sensor confirms presence in every pocket. This is also where the machine’s most important interlock lives: no bottle, no carton — an empty pocket means the erector simply skips one blank, so you never produce an empty sealed box.

On the HIJ-130B: the bottle feeder is a +US$4,000 option, and it’s the one we tell every bottle-line buyer to include. Without it, an operator hand-places bottles all shift.

Stage 2

Carton Pick & Erecting

Vacuum cups pull the blank from the magazine; a fixed guide squares it open.

Flat carton blanks sit fanned in an inclined magazine. AirTAC vacuum generators create suction at a set of cups that peel the bottom blank off the stack; as the blank is drawn down into the carton chain, guides force the pre-creased board to pop open into a rectangular tube. Board weight matters here — the machine is specified for 300–350 g/m² carton stock. Board that’s too light collapses under vacuum; board that’s too heavy resists opening and springs back.

Operating requirement: plant compressed air at ≥0.6 MPa, consuming 120–160 L/min — the vacuum and pneumatic cylinders all feed from this line.

Stage 3

Leaflet Folding & Pairing (optional)

Folding rollers reduce a full sheet to a packet matched to the carton height.

Where regulations require a patient information leaflet, the folding device pulls one flat sheet per cycle — 60–70 g/m² paper, up to 310×210 mm unfolded — and passes it through folding rollers set for 1 to 4 folds. The folded leaflet is delivered alongside the bottle at the insertion point so both enter the carton in a single stroke. A fiber-optic sensor verifies the leaflet is actually there; if it isn’t, the PLC flags that pocket for rejection downstream. The full station is covered in our guide to leaflet folding and insertion.

Stage 4

Product Insertion

The pusher stroke: bottle and leaflet slide horizontally into the open carton.

This is the moment the machine exists for. Product chain, carton chain, and pusher bar arrive at the same station in phase. A cam-driven pusher extends through the product pocket and slides the bottle — with the folded leaflet beside it — horizontally into the open carton. Because the motion comes from a cam, the acceleration profile is fixed and smooth: the push starts gently, peaks mid-stroke, and decelerates before the bottle reaches the far wall. That’s what lets the same station handle rigid glass and thin-walled plastic bottles without deformation, using only guide and timing adjustments.

Stage 5

Batch Embossing & Flap Sealing

Tuck-in tongue closure — fast, glue-free, and easy to open at the pharmacy.

Before closing, an embossing die presses the batch number and expiry date into the carton flap — indentation coding that can’t smudge or be wiped off, satisfying lot-traceability requirements without a separate printer. Then folding fingers close the minor flaps and the tongue: on a standard machine the tuck-in tongue locks into its slot mechanically. Lines that need tamper evidence specify the optional Meler hot-melt glue unit instead, which applies adhesive beads before the flaps are pressed shut. The trade-offs between the two are examined in tuck-in vs. hot-melt carton sealing.

Stage 6

Inspection, Reject & Output

Good cartons counted and discharged; flagged cartons ejected by air cylinder.

Every pocket’s sensor history — bottle present? leaflet present? carton opened correctly? — travels with that pocket through the PLC. At the discharge, a pneumatic cylinder kicks any flagged carton into the reject bin while good cartons continue to the output conveyor, counted on the HMI. The machine also protects itself: on mechanical overload it stops automatically and displays the fault location on the touchscreen, so a jam becomes a two-minute clearance instead of a bent pusher.

What Happens at Changeover

Switching bottle and carton formats means adjusting the magazine width, carton chain lugs, guide rails, and pusher stroke to the new dimensions — a trained operator typically completes it in 20–40 minutes with standard hand tools. Batch quantity, speed, and counters are recipe settings changed in seconds on the Siemens touchscreen. Practical time-saving routines are collected in our cartoning machine changeover checklist.

Frequently Asked Questions