A packaging conveyor system is the arrangement of conveyors, transfers, buffers, and controls that carries product between packaging machines and keeps it in an orderly flow when machines run at different rates. It handles primary containers such as bottles and jars, secondary packs such as cases and trays, and unit loads on pallets. Plant engineers, packaging engineers, and automation teams can use this section to compare conveyor families, work through the design questions that shape a layout, and see where conveying sits between depalletizing at the front of a line and palletizing at the end.
Main packaging conveyor types
No single conveyor suits every package, and most real lines combine several families.
Belt conveyors run a continuous belt over a bed or slider and carry cases, trays, bags, and other packs with a flat or stable base. They are quiet, gentle on product, and easy to inspect. They suit transport, inclines, declines, and merges, and a belt with a suitable surface can climb a modest slope without cleats. They are a poor fit for long accumulation, because moving belt friction pushes against queued product.
Live roller conveyors turn powered rollers under the product. Older designs drive many rollers from a shared shaft or belt. Motorized driven roller (MDR) designs put a small motor inside selected rollers so each short section can start and stop on its own. Roller conveyors are the usual choice for cartons, totes, and cases with a firm, flat bottom, and zone-by-zone control makes them the common platform for zero-pressure accumulation, merges, and sortation.
Tabletop chain conveyors use a chain of hinged plates as a flat running surface. The narrow, low-friction surface is built for single-file upright containers such as bottles, jars, cans, and cartons moving through filling, capping, labeling, and coding. Container stability depends heavily on guide rail setup, so changeover between container sizes has to be designed in from the start.
Modular plastic belts are assembled from interlocking plastic modules joined by rods, so they come in many widths and surface styles. They tolerate curves, wet areas, and frequent washdown, and open styles drain. Many lines use tabletop chain for single-file flow through a filler and modular belt for wider mass flow and accumulation downstream.
Accumulation is a function rather than a hardware type. Zero-pressure roller zones, accumulating tabletop sections, and rotary or spiral buffers all let product queue. The right form depends on product fragility, how long a stop the line must ride through, and whether first-in first-out order matters.
When product has to change level, the options are vertical reciprocating conveyors, continuous vertical lifts, case lifts, spirals, and inclines. Each affects throughput, footprint, and safety guarding differently. The vertical conveyors guide compares them.
Pallet conveyors, usually chain or roller based, carry unit loads between palletizers, stretch wrappers, labelers, and warehouse handoffs. They are heavier duty than case conveyors, and the condition and orientation of the pallet drive the design.
Air conveyors carry lightweight empty plastic bottles with a neck ring from a blow molder to a filler, hanging from neck guides while air moves them along. One supplier guide notes that layout, bottle shape, speed control, and guide material all matter, especially for bottles with easily scuffed surfaces.
Quick selection table
Treat the table as a starting point, not a specification. Final selection depends on the actual container, line speed, and cleaning method.
| Conveyor type | Products handled | Accumulation ability | Washdown and sanitation | Typical use |
|---|---|---|---|---|
| Belt | Cases, trays, bags, flat-bottom packs | Limited; belt friction acts on queued product | Good with sanitary belt and open frame design | Transport, inclines, merges, inspection |
| Live roller and MDR | Cartons, cases, totes with firm bases | Strong; zero-pressure zones are common | Possible with washdown-rated motors and frames; check supplier | Case lines, order flow, merges, queues before palletizing |
| Tabletop chain | Bottles, jars, cans, upright rigid containers | Moderate; product can slide and queue on the plates | Common in wet areas with stainless frames | Filling, capping, labeling, coding |
| Modular plastic belt | Many pack types, bags, trays, containers | Good for mass flow and buffer sections | Strong; open styles drain and are easy to clean | Food and beverage lines, curves, washdown |
| Vertical reciprocating or continuous lift | Cases, totes, carts, pallets (platform lifts) | Not an accumulator; batch loading and unloading | Depends on drive and enclosure; ask the supplier | Moving loads between floors and mezzanines |
| Spiral | Cases, trays, containers, bundles | Can serve as a vertical buffer | Common in sanitary food variants | Elevation change in a small footprint, cooling, buffering |
| Pallet conveyor | Pallets and unit loads | Moderate; pallets queue on chain or roller | Usually dry areas; washdown versions exist | Palletizer discharge, wrapper infeed, dock handoffs |
| Air conveyor | Empty plastic bottles with a neck ring | Limited; speed and gap control are important | Neck guides and filtered air keep contaminants low | Blow molder to filler transfer |
System design topics
Line layout and transfers
Layout starts with the sequence of machines and ends with the building. Straight runs are cheapest and easiest to maintain, but real plants have columns, aisles, and walls. Turns, merges, and diverts add transfer points, and each transfer is a place where product can tip, jam, or lose spacing. A good layout keeps transfers few, keeps product orientation consistent, and gives each machine a clear infeed and discharge. Transfers between different conveyor types, such as tabletop to belt, need attention to height, speed match, and the gap the product bridges.
Settle elevation changes early. A line that has to cross an aisle, go to a mezzanine, or move between floors will rule some conveyor options in or out before any other detail is chosen.
Accumulation and buffer sizing logic
Buffer sizing balances how long the downstream machine can stop against how much product the upstream machine keeps making in that time. Three questions frame it. How long are typical stops, and how often do they happen? How fast does the upstream machine keep running, and can it be told to slow or stop? How much product space is there between machines? The buffer has to hold what arrives during a stop, then empty again once the downstream machine resumes at a rate above the upstream rate. If the downstream machine has no spare speed, the buffer fills and stays full, so it only delays the stop.
Accumulation form follows product behavior. Fragile cartons favor zero-pressure zones so nothing pushes on the pack in front. Containers that slide on a smooth running surface can queue on a tabletop or belt with a low-pressure design. Where first-in first-out order matters, such as products that need dwell time, spiral buffers fit. A calculation for a real line should come from the supplier using actual stop data.
Controls: zone control, photo-eyes, and line-speed coordination
Zone control divides a conveyor into short sections, each with its own presence sensor. A section runs only when the section ahead is clear, so product stops without contact and moves forward in sequence once the head of the queue is released. Photo-eyes are the usual sensors, and delay timers can adjust behavior for different speeds. Release modes decide how product leaves a queue: some release one item at a time with a gap, others release a group together.
Line-speed coordination works across machines. A packaging line often has a slowest machine that sets the pace, and the conveyors around it should let faster machines run without overrunning it and let slower ones avoid starving. Controllers can slow upstream machines as a buffer fills and speed them up as it empties. Interlocks between conveyors and machines stop feeding a machine that has faulted. A supplier should show how stops, restarts, and fault recovery are handled, and whether the system can restart a full line without manual clearing.
Sanitation and washdown
Food, beverage, and pharmaceutical lines clean their conveyors, and the design has to allow for that. A hygienic design guide from one supplier lists smooth surfaces free of crevices, stainless steel in common grades, open frames for access, and tool-free removal of belts and covers. Open belt styles drain better than closed ones. Motors, bearings, and electrical enclosures need ratings that suit the cleaning method, whether dry cleaning, wet wipe, or high-pressure rinse. Dry packaging areas such as case and pallet lines can use painted steel in many plants, but the cleaning plan should say so.
Noise
Conveyor noise comes from drives, chains, roller bearings, product impact, and transfers. Chain and modular belt sections add link movement noise, and roller conveyors add bearing noise, so the mix of conveyor types changes how a hall sounds. On a bottle line, containers hitting guide rails and each other is often the loudest part. Noise control comes from drive selection, guide design, damping materials, and spacing control. Noise targets should come from the plant hearing conservation program, and the supplier should be asked for expected levels at the specified speed.
Maintenance access
Conveyors fail slowly when ignored. Lubrication points, chain wear, belt tracking, roller bearings, and drive components need inspection and scheduled replacement. The design should put them within reach without forcing crews to remove guards in a way that creates a hazard, and should give maintenance safe access to jammed product. Spare parts commonality matters too: a plant that mixes many chain types, belt styles, and drive brands carries a larger spares inventory than one that standardizes.
Guarding and safety
Conveyors present pinch points, nip points, rotating parts, shear points, and falling product. ASME B20.1 is the safety standard for conveyors and related equipment in the United States. Its 2024 edition addresses hazards across a conveyor’s life, from design and construction through installation, upkeep, inspection, and daily operation, and it excludes conveyors used primarily to move people. In general industry, OSHA requires machine guarding under 29 CFR 1910.212 and control of hazardous energy under 29 CFR 1910.147, which governs lockout and tagout during servicing. Emergency stop placement, guarding at transfers, safe crossovers over conveyors, and clear walkways are layout items to decide with the plant safety team. Local rules and the plant insurer may add requirements.
From depalletizing to palletizing
A typical flow starts at the receiving end, where pallets of empty containers are broken down by a depalletizer. Layers or loose containers then feed a conveyor, such as an air conveyor for empty plastic bottles or a tabletop line for glass and cans, that carries them to the filler. Behind the filler, capping, labeling, and coding stations are linked by conveyors that control spacing and orientation. A case packer or tray packer then forms secondary packs, and case conveyors carry those packs, often through accumulation, to a palletizer that builds unit loads. Pallet conveyors move finished pallets to wrapping, labeling, and the dock.
Several of those joints decide whether the line runs smoothly. The hand-off from depalletizer to container conveyor sets how steadily the front of the line is fed. The buffer between the case packer and palletizer decides whether a pallet change or a wrapper stop halts the entire line. Each joint needs a speed match, a space plan, and a stop and restart plan. The equipment overview places conveyors in the full set of packaging machinery, and the commissioning and acceptance checklist lists the questions to settle with suppliers before ordering.
Decision factors
Most buyers can answer these questions before talking with a supplier:
- What is being carried? Weight, base shape, stability, surface finish, and sensitivity to scuffing set the conveyor family.
- How fast, and with what variation? Average line speed matters, but so do peaks, stops, and changeovers.
- Does product need to queue? If so, choose between zero-pressure, low-pressure, and buffer forms.
- How is the area cleaned? Dry sweep, wet wipe, and pressure rinse call for different frames, belts, and motors.
- Where does the line have to go? Aisles, columns, mezzanines, and floor openings limit routes.
- How many formats will it run? More container or case sizes mean more adjustment, and some conveyors adapt faster than others.
- Who maintains it, and with what spares? A conveyor the plant cannot maintain will cost more than its price suggests.
- What safety rules apply? Guarding, emergency stops, and building code coordination belong on the first drawing, not added late.
Where to go next
The vertical conveyors guide covers lifts, spirals, and inclines for moving product between levels. Related sections cover depalletizing at the front of a line and palletizing at the end.
The detail pages cover bottle conveyors, case conveyors, and accumulation conveyors. Budgeting is covered in the packaging conveyor cost guide, and floor planning in the packaging line layout guide. For plant examples, see beverage packaging automation and case handling.
