Bottle Depalletizers and Infeed Systems: A Selection Guide

The way empty glass arrives decides what kind of infeed you need. Bulk pallets, where bottles sit loose in layers separated by tier sheets, call for a depalletizer that moves a whole layer at a time. Cased glass, packed in corrugated boxes with partitions, calls for unpacking equipment instead, or manual handling. Specify the packaging format with the glass supplier first, then evaluate machines against it.

Everything after that is a handoff problem: layer to table, table to single file, single file to the rinser or air cleaner. Each handoff controls how often glass touches glass, how much noise the line makes and whether the bottle reaches the next machine standing, spaced and oriented. This guide covers what to check at each step. It is editorial analysis of published sources and supplier material, not a ranking of machines.

From pallet to line

Bulk pallets with tier sheets

Waterloo Container, a glass distributor, describes bulk glass as ware placed directly on pallets at the factory without secondary packaging such as corrugated cases with partitions. Layers are divided with rigid tier sheets and strapped, and the whole pallet is wrapped, often with corner boards. The distributor lists lower packaging labor and less storage space as benefits; those are its commercial claims, but the format description is useful on its own.

Kaufman Engineered Systems, an integrator, describes a glass plant palletizing cell that built 440 bottles per tier and 10 layers per pallet using the plant’s pallets, sheets and top frames. That is one customer’s configuration, not a standard, but it shows what arrives at your dock: layers of loose bottles separated by sheets, topped with a frame. The cell also moves dunnage (pallets, sheets and top frames) automatically, which tells you that your receiving side has to deal with the same items in reverse.

Cased glass and reshipper packs

Cased glass arrives in boxes, usually with partitions, stacked on pallets. A decaser or unpacker lifts bottles out of the box, or the bottles are unpacked by hand. Waterloo notes that the cost of cased ware varies with fuel, freight, corrugated and labor, and that bulk delivery removes the case repack step. For a buyer, the practical effect is simple: cased glass costs more in packaging and handling, but needs less equipment at the line. If a supplier calls a boxed pallet “bulk,” confirm what is physically on the pallet before quoting equipment.

Returnable-bottle plants also unpack crates; Heuft’s description of a returnables line notes that crate checks catch foreign bottles before unpacking. That is a returnable-glass concern. Most new-glass lines have a single known bottle and do not need it, but the principle carries over: confirm the bottle you receive is the bottle the line was set up for.

Layer sweep-off versus other approaches

Layer sweep-off is the common method for bulk glass. A-B-C Packaging Machine Corporation describes its sweep-type depalletizer as squaring each layer before transfer, securing the layer below and its slip sheet while the top layer is swept off, and containing the layer on all four sides as it moves to the discharge conveyor. Optional features it lists include an empty pallet stacker, picture frame and slip sheet remover, a full pallet conveyor and a container single filer. These are one maker’s published features; other makers offer comparable but not identical options.

Other approaches exist, such as gripper heads that lift a whole layer, row-by-row push-off, or robotic picking. This is editorial classification rather than a sourced comparison, so ask each supplier to explain, for your bottle, how it:

• Holds the layer while the sheet is removed.
• Handles bottles that should not touch at the shoulder, or that taper toward the base.
• Handles the top frame, the sheet and the empty pallet, including stacking and removal.
• Recovers from a fallen bottle or a misaligned layer.

A-B-C also states that its machine changes over by entering new product and pallet parameters at the console, with no optional change parts for its quoted range. Treat this as a supplier claim and check it against your bottle range, especially for unusual shapes. The changeover guide covers verifying such claims.

Tier sheets, pallets and dunnage

Dunnage is the sheets, frames and pallets that protect the glass in transit. Plan for them as a material flow:

Item	What to settle
Tier sheets	Removal method, stacking, reuse or disposal, and what happens when a sheet sticks
Top frames and corner boards	Removal point, storage, and who retrieves them
Empty pallets	Stacking, magazine capacity, and forklift access
Straps and wrap	Removal before the depalletizer, and where the waste goes
Full pallet staging	Pallet condition, load stability and queue size at the infeed

Kaufman’s cell monitors levels of pallets, sheets and top frames so the next piece is available automatically; at the receiving end, the same question applies in reverse.

Single-filing, glass contact and noise

After sweep-off, bottles arrive as a wide mass and must become a single file. This is where glass contacts glass. The UK Health and Safety Executive states that noise on bottling lines is generated as glass bottles strike one another along the conveyors, and that, short of substituting plastic, the only means of reducing noise at source is to space the bottles to prevent collisions. It also notes that marshalling at entrances to and exits from parts of the line makes spacing hard. In its case study, an enclosure over the conveyor gave about a 5 dB reduction, with an estimated 10 dB possible if the side panels extended to the floor.

For a buyer, that means asking how the single-file transition limits pressure and impact, not only whether it can reach the required output. Ask about:

• Accumulation behavior: whether bottles queue under pressure or are held apart.
• Guide and rail materials in contact with glass.
• Behavior at starts, stops and restarts.
• Noise limits you need to meet and at what location, and whether an enclosure is expected.

Contact also matters for scuffing and chips, not only noise. The case packing guide covers the other end of the line, where similar contact concerns arise.

Handoff to the rinser or air cleaner

Inline Filling Systems, an equipment maker, explains that bottle rinsers clean empty bottles before filling, using clean air, ionized air, water or a water-based solution, and that air rinsers are meant to remove dust or contaminants that settled during shipment from the container supplier. Its twist rinser inverts each container 180 degrees using change parts matched to each container size.

The infeed controls what the rinser sees. Ask for:

• Spacing and orientation at the handoff.
• The format-specific parts at the transfer, such as twists or grippers.
• How a fallen or jammed bottle is cleared without stopping the whole line.
• Where inspection sits in the sequence, and what the rinser can and cannot remove. Whether an air rinser removes glass chips specifically is not stated in these sources; ask the supplier and the glass manufacturer.

Heuft describes infeed checks that pre-sort a single-variety stream before empty bottle inspection and reject bottles that could harm the inspector. Read bottle inspection systems for what each check covers. For how depalletizing fits into the whole line, see the line planning guide; for how lighter or thinner glass behaves at infeed, see lightweight wine bottles.

Questions to send suppliers

1. Which pallet configurations (bulk with tier sheets, with top frames, cased) is the quoted system designed for, and how were they confirmed with the glass supplier?
2. How does the machine hold and square a layer, and how does it handle bottles that taper or should not touch shoulder to shoulder?
3. How are tier sheets, top frames, pallets and straps removed, stacked and retrieved, and what are the storage capacities?
4. What happens on a fallen bottle or misaligned layer, and how is it cleared safely?
5. What is the single-filing method, and how does it limit glass contact, pressure and noise?
6. What accumulation buffer is included between the depalletizer and the rinser, and how is it controlled?
7. Which change parts or recipe changes are needed per bottle format?
8. What does the rinser or air cleaner remove, and what are the stated limits for glass fragments?
9. Which handoff heights, widths and spacing are assumed to the rinser, and what is required from the line layout?
10. What bottle samples and trial will you accept for acceptance, and what is recorded?

Evidence and limitations

This guide stops where site layout, bottle shape and supplier equipment decide the answer. Bulk pallet patterns, machine features and noise figures are configuration-specific; none of the numbers cited here (tier counts, noise reductions) is typical. Equipment and distributor pages are marketing sources and were used for descriptions of formats and features, not performance claims.

• Benefits of Bulk Glass, Waterloo Container: bulk versus cased glass, tier sheets, strapping and corner boards.
• Bulk Palletizing Glass Bottles, Kaufman Engineered Systems: example of a glass-plant bulk palletizing cell, tier and layer counts, and dunnage handling.
• Depalletizer Runs Small, Lightweight Glass Bottles, Packaging Technology Today (A-B-C Packaging Machine Corporation): layer squaring, slip sheet securing, optional features and changeover by parameters.
• Reducing bottling line noise, UK Health and Safety Executive: glass-to-glass noise and enclosure case study.
• Bottle Cleaning Systems, Inline Filling Systems: rinser and twist air rinser descriptions.
• Inspection systems in the filling plant, Heuft (translation of a 2002 trade journal report): crate checks and infeed sorting before empty bottle inspection.
• HEUFT InLine II IX X-ray empty bottle inspector, Heuft: infeed pre-sorting before inspection (manufacturer page).