Case Packing and Palletizing for Glass Bottles: Layout and Protection

Bottle contact, an unsuitable packing tool or an unstable pallet can damage glass, closures and labels before delivery. Choose the case, loading method and transport test together using the actual filled bottle and shipping route.

Compare supplier scope against these inputs, then copy or print the pack validation record. The following sections explain each choice without prescribing universal speed, price or containment settings.

Start from the packed case, not the machine

Work backward from what leaves the building. A filled, labeled glass bottle is heavy and sensitive to point impacts and scuffing. The pack design is the main protection, and the machine only has to build that pack repeatably.

Before comparing machines, collect the inputs that every supplier will ask for: bottle height, diameter and weight when filled; closure type and height; label type and position; the case or tray drawing; and the pack count and pattern.

Case styles for glass

Equipment-maker explainers describe a small set of case styles, and each treats glass differently.

According to Blueprint Automation’s explainer, the RSC is the typical knock-down case for shipping through distribution, while a wraparound blank is fastened by a machine and can be cut to fit the contents closely. The same source describes tray cases as an RSC variant lacking one side panel, often overwrapped for retail. Treat corrugated-savings claims as supplier statements.

For heavy glass, confirm whether the design includes protection between bottles, whatever the style is called. Smurfit Westrock describes box partitions as dividers made from paperboard or corrugated board that protect several products in one outer case by adding cushioning, restricting movement and improving stability. Wraparound and tray packs need internal dividers or pads to reach similar separation, and that must be in the case drawing.

Drop packing vs. pick-and-place

Compare how the proposed tool contacts the glass, label and closure. The published manufacturer comparison describes these motions; it does not validate them for your bottle.

Takeaway: Select the motion only after the supplier demonstrates the intended bottle and case; a flexibility claim alone does not establish safe contact.

For the grouping interface before packing, read Sidel Cermex RoboSELEX and the glass-bottle handling checks.

Protecting glass inside the case

Protection inside the case is a design deliverable. Agree it before you select a machine.

• Partitions and pads. Confirm cell size relative to bottle diameter, partition board, and whether the partition is inserted before or after the case is erected. A partition that is too tight can scuff labels; one that is too loose lets bottles move.
• Labels. Ask how long labels need to cure or dry before bottles touch partitions, and see bottle labeling methods for what each label system implies at the end of the line.
• Closure protection. Silgan Closures’ technical bulletin recommends corrugated dividers between pallets of tray-packed product to protect closure tops and spread load, and advises that finished product not be shipped frozen because glass can fracture.
• Case strength. Board grade, flute and compression strength are specified by the case supplier, not the machine maker.

Building the pallet

Pallet pattern

Pallet pattern trades vertical strength against side-to-side stability. One pallet-building explainer describes column stacking as maximizing compression strength by aligning vertical edges, but offering less resistance to side shifts, and interlock or brick patterns as giving more lateral stability at some loss of vertical capacity. For glass, the pattern also decides how much weight bears on the bottles through the case and whether tier sheets are needed. Silgan’s guidance for finished pallets adds that overhang should be minimized and cartons should rest on the pallet deck. A palletizing supplier should show the pattern on a layer drawing for your case and pallet size.

Tier sheets

Tier sheets (layer pads) are placed between layers. Cartonplast describes plastic layer pads for glass containers that have rounded corners suited to shrink film and sheet handling by automated equipment. This is a supplier statement. Tier sheets also matter at the other end of the line, covered in depalletizers and infeed systems. Decide whether sheets are single-use or returned, and who places them.

Corner boards and containment

Corner boards or edge protectors disperse strapping or film force along a rigid edge. Millwood describes them as distributing strapping tension and improving unitization. The pallet-building explainer also says corner boards let film be applied at higher tension without crushing cartons, and suggests three to five tight base wraps to catch the pallet deck. This is a single-source starting suggestion from Cleverence, not a validated design value for a glass pallet. Ask whether the load needs strapping and how film forces are checked against the glass and case design. Silgan recommends machine stretch wrapping for consistent tension and advises against excessive tension that buckles cartons. Specify wrap tension, number of wraps, film type and whether a top sheet or strapping is needed, and agree how the wrap pattern is validated.

Logistics and retailer requirements to confirm

Retailers and carriers publish their own rules, so confirm them before you lock layout and pallet pattern. Check at least the following.

• Pallet footprint, grade and ownership, such as pooled or one-way.
• Maximum pallet height and weight, including the pallet itself.
• Overhang limits and whether the pallet must be double-stackable.
• Label rules: GS1-128 shipping-container labels, SSCC numbers, label positions and print quality. A labeling vendor’s explainer notes that an SSCC is an 18-digit code in a GS1-128 barcode and that it must agree with the advance ship notice.
• Distribution test expectations. ISTA’s Procedure 3E is a general simulation test for unitized loads of retail packaged products shipped by truckload to a distribution center, so ask the customer whether a test like this is required.

Verify each one, because values differ by customer and program and change over time. Pallet weight also decides how many pallets go on one truck: how many pallets of glass bottles fit on a truck shows how to check whether a full load reaches its weight limit before its floor space.

Small-batch and parcel shipments

Not every order leaves as a full pallet. Samples, small wholesale orders and direct shipments may travel as single cases through a parcel network. Each case is then handled, conveyed and dropped on its own, without the protection of a stretch-wrapped unit load. Design and test the pack for that route separately. Do not assume a case that ships well on a pallet will also survive parcel delivery.

For a parcel route, decide these points in the case design:

• Separation. Every bottle should sit in its own cell or insert so that bottles do not touch each other. Specify the partition or insert in the case drawing, as for palletized product.
• Case and closure. Board grade and the closure method of the case (tape, glue) belong to the case supplier’s specification. Ask for the version intended for parcel shipment if it differs from the pallet version.
• Orientation and labeling. Orientation arrows are not a guarantee of handling, so check in the test that closures and labels survive if the case travels on its side or upside down.
• Carrier rules. Carriers publish their own packaging guidelines and rules for liquids and glass. They are outside this guide, so read the current version for each carrier you use.

If a pallet route and a parcel route use the same case, test it for both.

Validating the pack: what counts as the best packaging

There is no single “best packaging for glass bottles”. A pack is good enough for a given route when it passes the test agreed for that route, runs on your packing line, and meets the customer’s rules. Judge proposals against those criteria, not against claims of strength.

Published test procedures differ by distribution route:

• Unitized loads by truckload. ISTA 3E covers unitized loads of similar retail or institutional packaged products shipped by full truckload.
• Single parcels. ISTA 3A covers packages of 150 lb (70 kg) or less sent through parcel delivery as individual packages, by air or ground. ASTM D7386 is a laboratory practice for shipping units up to 150 lb (68 kg) in single-parcel delivery systems.
• A general laboratory sequence. ASTM D4169 evaluates shipping units against a sequence of hazards drawn from distribution cycles. It refers single-parcel shipments to D7386.
• Drop testing as one element. ASTM D5276 is a test method for drop testing loaded boxes and other containers by free fall. A drop test on its own does not cover vibration, compression or the full route.

These documents describe test methods. They do not say whether any particular case or partition passes, and a pass under one procedure does not show that the pack will survive a different route. Before testing, agree with the customer or carrier which procedure applies and what counts as a failure: broken glass, a leaking or loosened closure, a scuffed label or a crushed case. Keep records of real damage in transit, which show whether the tested pack works in practice.

Pack validation record

Copy or print one record for each pack revision and route; leave criteria and procedure versions blank until agreed with the customer or test provider.

Questions to send suppliers

1. Which case styles can the machine handle for our bottle, and which tooling is needed for each? Please quote any partition inserter, case erector, sealer and pad or sheet placers as separate lines.
2. How are bottles placed into the case, and which parts of the bottle touch the grid, gripper or partition?
3. What bottle and label tolerances does the design assume?
4. How are bottles accumulated and grouped before the packer, and how does this interface with the upstream equipment described in planning a glass bottling line?
5. Which pallet patterns are supported, how are tier sheets, top sheets or frames placed, and who supplies them?
6. What stretch wrap, strapping and corner-board options are included, and what tension and wrap pattern are validated?
7. What case, label and pallet information does the controller print or verify?
8. Which format changes need change parts and which are recipe-only? If we ship both pallets and single cases, can the packer handle both case versions?
9. What documentation, spare parts and training are included, and what will be tested at factory and site acceptance? The bottling equipment RFQ checklist lists the points to compare across proposals.

Use the completed pack validation record with the RFQ checklist to compare scope and retain the real transit feedback.

Evidence and limitations

This guide synthesizes publicly available explainers and standards scopes. Case style, packer type, partition design and pallet pattern all depend on bottle weight and shape, label, line speed, case supplier and customer requirements. Equipment-maker pages describe general capabilities and carry commercial interests, so confirm their statements for your specific configuration. Qualified packaging parameters, pallet limits, wrap settings and retailer rules must be established for each route; the single-source wrap suggestion above is an example rather than an acceptance specification. Test procedures are cited for their scope only.

• Four Types of Case and Tray Packers, Blueprint Automation: defines RSC, tray, wraparound and harness cases and loading configurations. Accessed October 8, 2026.
• Types of Case Packers: Drop, Pick-and-Place, and Robotic Compared, Hamrick Packaging Systems: compares drop, gantry pick-and-place and robotic packers, including trade-offs. Access attempted October 8, 2026; full text unavailable in this recheck. Confirm the current document with its publisher.
• Box partitions, Smurfit Westrock: describes partitions as protective dividers for multiple products in one case. Accessed October 8, 2026.
• Plastic layer pads, Cartonplast: supplier description of layer pads for glass containers and automated handling. Accessed October 8, 2026.
• Edge Defender edge protectors, Millwood: explains edge protectors in strapped and wrapped unit loads. Accessed October 8, 2026.
• Pallet Building 101, Cleverence: vendor explainer on column versus interlock patterns, wrapping and corner boards. Accessed October 8, 2026.
• Steel Closure Operating Guidelines (TAB4), Silgan Closures: tray packing, palletization and shipping guidance for glass with steel closures. Reviewed October 8, 2026 via the public PDF: Bulletin 004, Revision B, issued April 7, 2022; guidance for the maker’s steel closures.
• ISTA 3E overview, International Safe Transit Association: scope of the unitized-load truckload simulation test. Accessed October 8, 2026.
• ISTA test procedures, International Safe Transit Association: series overview and the scope of procedures 3A (parcel delivery) and 3E (truckload unitized loads). Accessed October 8, 2026.
• ASTM D4169, Standard Practice for Performance Testing of Shipping Containers and Systems, ASTM International: scope of the distribution-cycle test practice. Access attempted October 8, 2026; full text unavailable in this recheck. Confirm the current document with its publisher.
• ASTM D7386, Standard Practice for Performance Testing of Packages for Single Parcel Delivery Systems, ASTM International, D7386-25: public scope of the single-parcel test practice, reviewed October 8, 2026; confirm the edition agreed for your test.
• ASTM D5276, Standard Test Method for Drop Test of Loaded Containers by Free Fall, ASTM International, D5276-19(2023): public scope of the free-fall drop test, reviewed October 8, 2026. Full paid test instructions were not reviewed.
• SSCC Pallet Labels Explained, Certified Labeling Solutions: describes SSCC and GS1-128 pallet labels and their link to advance ship notices. Accessed October 8, 2026.