This page is for the buyer, the packaging engineer or the QC manager who has already settled the bottle and now has to write the carton layer of the order: which box style, which corrugated construction, which insert holds the bottles apart, how the box is closed, what is printed on it, and how the carton is accepted or rejected when it arrives at the warehouse. It is written for the person who has to put a checkable document in front of a carton supplier, so that the pack can be inspected against clauses rather than described in a meeting.
The boundary is worth stating at the top. This page deals with the carton layer only, and stops before the load path above the carton. If the open question is how much axial load the bottom carton and the bottles beneath it carry in a stack, and how that load is proved before the order ships, that is a stacking load question and not a carton question. If the question is how many cartons and pallets fit into a container and how the pallet pattern uses the volume, that is loading arithmetic. Both are named with their own pages at the boundary section near the end of this page, and neither is repeated here.
What a Carton Specification Has to Fix, and the Order to Fix It In
A glass bottle carton specification is the middle layer of a packaging specification sheet. Above it sits the bottle: shape, capacity, weight, finish, decoration. Below it sits the load: the pallet pattern, the stack height, the container loading plan and the handling equipment at both ends. The carton layer is what converts a loose group of bottles into a unit that a person, a machine or a forklift can move without the glass touching glass.
The items that have to be fixed are always the same set, and they are decided in a fixed order because each one constrains the next. Box style comes first, because a regular slotted container and a two-piece telescopic box carry stacking load in different ways. Internal dimensions come next, derived from the bottle diameter, the number of bottles per box and the clearance the insert needs. Board construction follows from the stack height, the journey and the handling, not from habit. The insert follows from the contact the bottle actually needs. Closure method comes after that, because a closure that lets the flaps move destroys the compression value of the best board. Marking and acceptance clauses come last, because they are written against everything already decided.
Two conventions make the document much easier to use. The first is to separate what is measured from what is chosen. An internal dimension, a board combination and a box compression value are measured items and can be checked with instruments. A box style, a print layout and a closure pattern are chosen items and are checked by comparison against an approved sample. Mixing the two in one paragraph is the most common reason a carton specification cannot be enforced. The second convention is to state the test method and the conditioning beside every measured figure, because a board value without a method and a humidity condition cannot be compared with another laboratory’s value.
No numeric board or compression value is given in this page on purpose. Board combination and compression capacity are selected for the duty of the pack and confirmed against the carton supplier’s own measured data, because the same nominal construction performs differently depending on the liner combination, the flute, the converting quality and the climate the shipment will cross.
Box Style: Regular Slotted, Two-Piece, Die-Cut and the FEFCO Numbering
Box style is the first decision because it decides where the stacking load goes. Corrugated board is stiff in one direction and weak in the other: the flutes resist compression along their length and collapse easily across it. In an upright box the flutes run vertically through the walls, so the corners and the vertical wall panels carry the load, and any feature that interrupts the corner or lets the walls bow reduces the load the box can take. Two boxes made from the same board can differ substantially in stacking performance because of style alone.
The regular slotted container, known in the FEFCO numbering as 0201, is the default. It is made from one blank with a minimal waste pattern, it is the cheapest to convert and the cheapest to store flat, and it closes with a centre seam that can be taped or glued. Its weakness is that its stacking strength depends on the flaps holding the top square, and heavy contents bow the sidewalls between the corners. For a light bottle pack in a normal supply chain it is the right answer, and for a heavy pack it is the style that most often needs a board upgrade instead of a style change.
The two-piece telescopic box, in the FEFCO 0300 series, uses a separate lid over a base and is the usual choice for heavy glass. Load passes through the lid into the base walls, the double thickness at the overlap stiffens the top of the pack, and the box can be opened and reclosed without losing its shape. It costs more board, takes more space on the pallet footprint for the same internal volume, and is slower to pack by hand. A full-depth one-piece version and a tray with a separate lid sit between the two extremes and are common for multipacks and for retail-facing packs.
Die-cut and tuck-end styles, and wrap-around blanks, are chosen for what the pack has to do after it leaves the pallet rather than for stacking. A display-ready tray, a shelf-ready pack or a printed retail carton is designed around the shelf and the customer’s handling, and its stacking capacity is usually lower than that of a slotted box made from the same board. The bliss box, in which the corners are glued full depth, is the strongest of the common styles for a given board because it eliminates the flap gap at the corner, and it is specified where a heavy glass pack has to survive a long sea route with double stacking.
The practical selection question is therefore not which style is best but which style carries the load with acceptable board cost. Ask three things of the pack: the gross weight of one box, the number of boxes that will sit above the bottom one, and whether the box must be opened and reclosed in the destination market. The answers point to one or two styles, and the rest of the specification follows.
Flute Profile, Wall Count and Board Combination: What a Grade Actually Buys
Once the style is fixed, the board has to be specified by construction rather than by a single number, because corrugated board is a sandwich and its performance comes from the combination of liners and flutes rather than from its total thickness. A taller flute gives more vertical compression resistance per unit of board weight but prints poorly and scores badly, and it takes more pallet volume when the boxes are stored flat. A shorter flute gives a flatter, printable surface and a sharper score, with less compression per millimetre of wall.
The waist of the pack, meaning the number of walls, is the next variable. Single wall board is right for light bottles and short stacks. Double wall board is the usual answer for a heavy glass pack: it adds a second fluting and a third liner, which raises compression and puncture resistance and slows moisture migration through the wall. Triple wall exists for extreme duty and is rarely economic for glass bottles because the volume and handling cost of the board outweighs the gain. Double wall board also scores and folds less crisply, which shows up as a slightly larger box footprint and as a need for the boxmaker to adjust the scoring, and it should be tested on the real pack before it is written into the specification as a fixed choice.
The liner combination matters as much as the flute. A recycled liner and a virgin kraft liner of the same nominal weight behave differently at high humidity, and the converting quality determines whether the board’s theoretical compression is actually delivered by the finished box. This is why the specification should name the construction the way the boxmaker states it, as a liner and flute combination, and then require the measured performance rather than a nominal weight.
Moisture is the variable that most often makes the difference between the board grade that was ordered and the performance the shipment received. Corrugated board takes up moisture from the air, and its compression resistance falls as relative humidity rises, which is why a box that passes a compression check in a dry plant can deform inside a container on a humid route. Board condition at the time of packing, the ventilation of the container and whether the pallets are shrink wrapped before or after loading all belong in the pack notes, because they change the effective grade in service without changing the paper that was bought.
Edge Crush, Bursting Strength and Box Compression: Reading Each Figure
Three test values appear on carton paperwork and they answer three different questions. Confusing them is the reason a carton can look well specified on paper and still fail in the field.
The edge crush test measures the compression resistance of a small strip of board loaded along the flute direction, and it is the nearest thing to a direct measure of how the material will behave in the walls of a stacked box. The box compression test measures a complete, closed box under a platen and gives the figure that actually matters for stacking, because it captures the effect of the box dimensions, the corner construction and the panel size on top of the board properties. Box compression is lower than an estimate made from edge crush alone, because a real box bows between its corners, and the taller and wider the box, the larger that penalty becomes. If only one figure can be quoted, the box compression value is the one that describes the pack; if the design is still being changed, edge crush is the figure that lets a boxmaker compare constructions quickly.
Bursting strength, and the puncture test that often accompanies it, measure resistance to rupture and to a pointed impact rather than to compression. They are the right figures for a pack that will be handled roughly, stacked unevenly or dropped, and they are the wrong figures to quote as evidence that a pallet stack will hold. A board can have excellent burst resistance and modest edge crush, and it will then survive handling well and still deform in a tall stack.
Every one of these figures is only comparable when the state of the sample is known. Board figures are quoted at a stated conditioning, and a value taken from a dry sample is not a value for a humid warehouse. The specification should therefore require the method name, the conditioning and the sample size beside each figure, and should require the values to come from the carton supplier’s own measured data on the construction being supplied, not from a generic table. A useful clause is a requirement that a change in liner supplier or in flute profile triggers a new measurement rather than an assumption of equivalence, because that is exactly the change that quietly removes compression capacity from a pack.
Where the stack requirement has already been calculated, the box compression figure has to be compared against it with the service losses applied: the loss from humidity on the route, the loss from time under load, and the loss from the pallet pattern and any overhang. Those losses are the subject of the stacking page rather than this one, but they are the reason a carton specification that quotes only a board grade is incomplete. The carton layer should state the measured capacity and the conditioning, and the load calculation should state the demand.
Fitting the Bottles Inside: Partitions, Die-Cut Inserts, Pulp and Foam
The insert is what stops glass touching glass, and it is also the part of the pack that decides how much of the stacking load reaches the bottles and how much bypasses them through the board.
A corrugated partition, made from interlocking strips or from a folded cell blank, divides the box into cells and holds each bottle at a defined distance from its neighbours. Two things about it have to be specified. The first is the cell count and the pitch, which must match the bottle diameter with enough clearance for the bottle to drop in and come out again without binding. The second is the partition height relative to the bottle body: a partition that stops below the shoulder leaves the bottle freer to lean than one whose strips reach above the widest point, and a partition that stands proud of the box can stop the flaps closing flat. The board used for the partition matters too, because a soft partition folds over under load and stops separating the bottles.
A die-cut corrugated insert with formed neck holes locates the bottle by its neck as well as its body. This is the most common insert for tall, narrow bottles where the centre of gravity is high and the bottle wants to tilt, and it can be designed so that the insert rests on the shoulder and carries vertical load around the bottle rather than through it. If the design relies on that load path, the hole diameter, the hole position and the contact surface have to be agreed against the bottle drawing, because a hole that is slightly tight grips the neck and transmits handling loads into the finish, which is where a chip becomes visible on the customer’s line.
Moulded pulp inserts and trays are formed to the bottle and give a good fit with a single piece, and they are widely used for spirits, oils and jars. They take up moisture, shed a small amount of fibre dust and need a stable tooled shape, so they suit a long production run of one bottle more than a mixed order. Foam inserts, whether expanded polyethylene, expanded polyurethane or a laminated foam, are chosen for cushioning rather than for stacking: a foam pad absorbs energy in a drop, and it contributes little to the compression path unless it is combined with a corrugated or honeycomb structural layer. A honeycomb board pad is the usual compromise, contributing stiffness as well as a degree of cushioning.
Loose fill, air pillows and shredded paper are the cheapest way to stop movement and the least controllable way to guarantee it. They settle in transit, they allow bottles to find each other, and they make the pack hard to check on arrival. Where a specification allows loose fill, it should still fix the fill volume and the number of bottles per box, and it should require a trial shipment rather than a drawing, because the only evidence that loose fill works is a real journey. The reliable way to specify any insert is a packing drawing plus an approved physical sample, with the drawing controlled under the same revision rule as the rest of the specification.
Closing the Box: Tape, Hot Melt, Strapping and the Effect on Compression
The closure is part of the structure of a slotted box, not an accessory. An upright box carries stacking load through its four corners and through the panels between them, and the flaps at the top are the only thing holding those panels in position. A box whose flaps are free to slide and separate loses much of the compression capacity the board was bought to provide.
A single strip of pressure-sensitive tape down the centre seam holds the flaps together but does little against the shear that tries to move one flap laterally against the other, and it cannot join the flap to the sidewall. A tape pattern that runs down the centre seam and down both ends, usually described as an H pattern, bonds the flaps to the side panels and behaves noticeably better under load. Water-activated tape, applied wet and cured onto the board, forms a bond that stiffens the seam further and resists humid conditions better than many pressure-sensitive tapes. Printed tape costs nothing structurally and carries the mark, but the print must be checked for the destination’s own labelling expectations.
Hot melt adhesive applied in lines between the flap surfaces creates the stiffest closure of the common methods and is the usual choice where the box has to carry load or where an automatic case sealer is in use. The specification for a glued box should state the number and the position of the glue lines, the compression time on the sealer and the pressure applied, because a correct glue pattern applied with too little compression time produces a bond that opens in transit, and the failure will be blamed on the board. For either tape or glue, the case sealer settings belong in the pack notes that travel with the order, not only in the carton supplier’s file.
Strapping is a separate measure with a separate purpose. Vertical straps hold the box closed against bursting, cross straps and perimeter straps hold several cartons or a carton and a pallet together, and none of them should be expected to restore stacking strength. A strap tensioned over the top of a stack can, if it is applied badly, deform the top layer of an already weak box and start the collapse it was meant to prevent. Where strapping is needed as a unitising measure, say so in the specification, and describe it as a unitising requirement rather than as part of the carton construction.
Carton Marking, Shipping Marks and Destination Requirements
The mark is the carton layer that has to work in a warehouse where nobody has the specification. Its job is to let the right box be found without opening it, to let the receiver reconcile the delivery against the purchase order, and to tell the people handling it what the box can tolerate.
The commercial mark normally carries the consignee, the purchase order or item number, the product and colour or size variant, the quantity in the box, the gross and net weight, the outside dimensions, and the carton number within the shipment. A per-carton number is easy to omit and difficult to reconstruct later: it is what allows a damaged carton to be identified inside a container and what enables a batch-level claim. Where the receiving distribution centre scans, a label with a shipment identifier and a barcode is required in addition to the printed mark, and the label position and the print quality have to be fixed, because a label that lands in a different place on every carton slows receiving.
Handling marks are the second half. Pictograms such as the standard set used for transport packages, and the printed warnings that accompany them, tell the handler which way is up, what must be kept dry, what is fragile and how high the pack may be stacked. A maximum stacking figure printed on a carton is only useful if the number is the real limit for the pack; a number chosen for appearance is worse than no number, since it shifts responsibility onto the carton rather than onto the loading plan. Country of origin marking is a legal requirement in many destinations and its wording and position should be confirmed with the buyer rather than assumed.
Because the mark is checked at the destination, it belongs in the specification as a layout with defined content, font size, colour, and placement on the carton face, plus a rule for language. The practical test is whether a person at the receiving dock, with no knowledge of the product, can identify the box, count the shipment and see the handling limits without opening anything. Anything that fails that test will be raised as a claim by the customer, and the fix costs a reprint rather than a redesign.
Carton Specification Worksheet: How Each Item Is Chosen, Measured and Accepted
The table below sets out the items a glass bottle carton specification normally contains, how each one is selected, what its figure means, how it relates to compression and damage, how to write it as an acceptance clause, and what to confirm with the carton supplier. It is written as a worksheet: each row can be filled in for one pack, and the acceptance column is the sentence that goes into the purchase order.
| Specification item | How it is chosen | What the figure or description means | Effect on compression and damage | How to write it as an acceptance clause | What to confirm with the supplier |
|---|---|---|---|---|---|
| Box style, named by FEFCO number | From gross box weight, number of boxes to be stacked above the bottom one, and whether the box must be reclosed in the destination market. | The FEFCO number identifies the blank and the closing method, so a style can be specified without a drawing argument. | Decides whether load passes through corners alone or through a doubled wall, the strongest single influence on stacking behaviour. | State the FEFCO style plus an approved sample reference, and reject any supplied box whose corner construction differs. | The blank size and the score positions, and whether an approved sample is retained by both parties. |
| Internal dimensions and tolerance | From bottle diameter, bottles per box, insert clearance and whether the box is hand or machine packed. | Internal dimensions are the working dimensions; outside dimensions drive the pallet pattern and the container loading. | Too tight a box grips the shoulders and transmits handling load to the glass; too loose a box lets bottles move and lose corner support. | Quote internal length, width and depth with a stated tolerance, measured inside the box on the assembled carton. | Which dimension tolerance the boxmaker can hold routinely, and how the box is measured after scoring. |
| Flute profile and wall count | From the duty: weight, stack height, route humidity and handling roughness. | A taller flute or a second wall raises compression and puncture resistance and also raises board weight, space and cost. | Directly sets the compression ceiling of the pack before any service loss is applied. | Name the flute profile and wall count, and require the supplied board to match the approved sample. | Whether the flute named is the one actually run for this job, and what substitutes are permitted. |
| Board combination by liner and flute | Selected with the boxmaker against the required compression performance rather than against a nominal weight. | The liner and flute combination, not the nominal weight, describes the material actually supplied. | Liner quality and converting determine how much of the theoretical compression the finished box delivers. | Require the combination to be stated on the delivery documents and to be unchanged without written notice. | Liner sources used, and whether a change of liner would be notified before shipment. |
| Edge crush and box compression values | Required from the boxmaker’s own measured data for the construction and box size being supplied. | Edge crush characterises the board; box compression characterises the finished box under load. | These are the only figures that can be compared with a calculated stacking demand. | Require the values with the test method, the conditioning and the sample size, and require a re-measurement after any material change. | Whether the boxmaker can supply the record with the shipment, and at what conditioning it was measured. |
| Internal partition, divider or die-cut insert | From bottle shape, centre of gravity, whether bottles may touch, and the load path chosen for the stack. | Cell pitch and height, hole diameter and contact surface define how bottles are separated and located. | A correct insert shares load between board and glass; a soft or short partition lets bottles lean and chip each other. | Specify the insert by approved drawing and sample, with cell count, pitch and material. | Partition board grade, cut accuracy, and whether the insert height clears the bottle shoulder and the closed flaps. |
| Closure method and pattern | From the packing method, the equipment available and whether the box carries load. | Tape pattern, tape type or glue line number and position define how the flaps are held to the panels. | A weak closure removes a large part of the compression capacity the board grade was bought for. | State the tape pattern or the glue pattern, the tape type and width, and the sealer settings to be used. | Whether the sealer is set and maintained to the stated pattern at the packing site, not only at the carton plant. |
| Marking and label layout | From the purchase order fields, the receiving system and the handling limits of the pack. | Content, position, size and language of the mark, plus any barcode or shipment identifier label. | No structural effect, but a wrong or missing mark blocks the receipt and triggers claims on the carton. | Attach an approved mark layout and require the first article to be checked against it before the run continues. | Print colours, plate cost, and whether the mark changes per order without a new plate charge. |
| Inspection level and acceptance criteria | From the criticality of the pack and the customer’s own receiving standard. | A sampling scheme such as ISO 2859-1 with an agreed AQL defines how many cartons are checked and what fails the lot. | Defects that matter structurally, such as a crushed corner or a missing partition, cannot be treated as cosmetic. | List the critical, major and minor defects separately and name the acceptance level for each class. | Whether the carton supplier inspects at the same level, and what evidence accompanies each shipment. |
What the Packing Line and the Palletiser Add to the Carton Requirement
A carton that is correct on a drawing can still be wrong on a packing line, and these constraints belong in the specification because they are decided by the line the pack must run on.
An automatic case erector needs a blank that opens predictably: consistent scoring, consistent board calibre and a flat blank that has not taken up moisture in storage. A hand-packed line tolerates more variation than a machine, and a specification written without knowing which one will be used is a common source of line stoppages. A case sealer needs a consistent box height, because the sealer’s compression section is set for one thickness, and a change of board construction changes the height of the closed box. Where the pack passes through a checkweigher, a metal detector or a label applicator, the carton has to hold its shape through those stations as well as on the pallet.
Palletising is where the carton meets load it was never tested with in isolation. A column stack, in which each carton sits directly on the one below, preserves the corners and delivers the highest stacking performance. An interlocked stack, which ties the layers together for stability, breaks the corner alignment and reduces the load the pack can carry. Slip sheets between layers spread the load and can help; they also add cost and handling steps. Corner boards and edge protectors restore corner load paths in a stack that has been interlocked, and they are a cheap way to recover performance that a fragile box has lost by pattern rather than by material.
The pallet itself is part of the load path. Cartons that overhang the pallet deck lose the support under their outer edges and their compression capacity drops, and the loss grows quickly with the amount of overhang. Cartons that sit inside the deck footprint with a gap are equally badly served, because the load path shifts inward and the corners no longer carry their share. Mixed carton sizes on a single pallet, missing deck boards and layer misalignment all concentrate load onto a few cartons, and in a pack whose bottles stand directly on each other, that concentration arrives on the glass. The pallet pattern, the wrap force and the use of top caps should therefore be written into the pack specification that accompanies the carton specification, so that the carton is never judged against a load pattern it will not see.
Failure Modes a Carton Specification Is Meant to Prevent
The value of writing the specification item by item is that each clause can be traced to a failure that would otherwise happen and be argued about.
Crushed corners on the bottom layer are the classic stacking failure, and they point to a board or compression clause that was never written, a stack height that exceeded the calculated demand, or a pallet pattern that overloaded one corner. Bulging sidewalls that recover when the load is removed indicate that the board is at its limit and that the box has lost the corner support that keeps the panels straight; a box that stays bulged has taken moisture as well. Flap pop and tape shear indicate a closure clause that specified a tape pattern without specifying the sealer settings, or a shift from a glued closure to a taped one without a review.
Chips and scuffing on the bottle body, and damage around the neck or finish, usually trace back to the insert rather than to the board. A missing or short partition lets bottles touch; a neck-hole diameter that is too tight grips the finish and transfers handling load into it; a box that is too short for the bottle pushes the flaps onto the neck and loads the closure. Glass particles and dust found inside a carton indicate a break that happened earlier in the pack’s life, and they make the whole carton a quality event rather than a cosmetic one, because glass in a pack that will meet a filling line is a contamination risk.
Puncture and wet damage are the handling failures. A puncture is a point load from a forklift, a pallet nail, a strapping edge or a protruding bottle shoulder pressing from inside, and it is answered by puncture-resistant board, by corner protection or by changing what protrudes. Wet damage is answered at the container level rather than at the carton level: a container that sweats over a humid route wets the cartons from the top down, and desiccant, ventilation and liner choices are the fix. A carton specification that has no clause about moisture will still be blamed for the damage.
Finally, the acceptance clause itself can fail. A specification that lists ten defects without separating them into critical, major and minor classes forces an all-or-nothing decision that everyone loses: the receiver either accepts a structurally weak pack or rejects a sound one over a print shade. Agreeing the classes and the sampling level in advance, with a retained approved sample on both sides, is what makes the document enforceable. A lot inspection scheme such as the widely used ISO 2859-1 family with an agreed AQL is the normal way to write that clause, and it should be described in the contract language rather than left as a verbal understanding.
Where This Page Stops, and Which Page Answers the Rest
This page covers the carton layer: box style, board construction, the meaning of the board and box figures, the insert that separates the bottles, the closure, the mark and the clauses that make the carton acceptable. Three adjacent subjects are deliberately outside it.
Load above the carton is not a carton question. How many boxes can be stacked, how the load on the bottom carton is estimated, how the dynamic and humidity losses are applied and how a compression test is framed and read are all covered on glass bottle vertical load test, and that page should be read together with this one, because a carton specification without a stacking demand is only half a document.
Impact is a separate mechanism with a separate test. What happens when a packed carton is dropped, tipped or thrown from a pallet, and which drop heights and surfaces matter for a filled pack, belongs to glass bottle drop test. A box can pass a compression requirement and still fail a drop, because the two load the pack in different directions.
Volume and load planning are the third separate subject. How many cartons fit into a 20 ft or 40 ft container, how the pallet pattern uses the floor and the height, and how much space is lost to pallets, top caps and dunnage belong to glass bottle CBM guide. How bottles are supplied, bulk packed and handled before they are packed into cartons, including the handling assumptions that come with bulk supply, is set out on glass containers in bulk. Those pages deal with what happens above and around the carton; this page deals with the carton itself.
Questions Buyers Ask About Glass Bottle Carton Specification
What should a glass bottle carton specification contain?
Seven groups of items: the box style named by its FEFCO number, the internal dimensions with tolerances, the flute profile and wall count, the board combination by liner and flute, the measured edge crush and box compression values with their method and conditioning, the internal partition or insert specified by drawing and sample, the closure pattern with its sealer settings, the mark layout, and the inspection level with defect classes. Each item should be written so it can be checked on arrival, and the measured items should be separated from the items that are checked against an approved sample.
Which box style is best for heavy glass bottles?
For heavy packs the usual answers are a two-piece telescopic box or a bliss-style box with full-depth glued corners, because both keep a continuous corner load path and resist sidewall bowing better than a regular slotted container made from the same board. A regular slotted container is still the right choice for lighter bottles and shorter stacks, and upgrading its board is often cheaper than changing the style. The decision depends on the gross box weight, the number of boxes above the bottom one and whether the box must be reclosed at the destination.
Is edge crush or box compression the figure I should put in the specification?
Box compression is the figure that describes the packed box under load and it is the one to compare against a stacking demand. Edge crush characterises the board and is useful while the design is still being compared, because it lets a boxmaker test constructions quickly. Bursting and puncture figures describe resistance to rupture and to impact and should not be quoted as evidence of stacking performance. Whichever is used, the test method, the conditioning and the sample size belong beside the number.
Do I need a partition inside the carton?
If the bottles may touch each other, and there is no other feature holding them apart, a partition or die-cut insert is the only reliable way to prevent glass-to-glass contact and the chipping that follows. The partition also affects the load path: a rigid partition that reaches the shoulder can share vertical load between the board and the bottles, while a soft or short one lets bottles lean and rub. For tall narrow bottles, an insert that locates the neck as well as the body is usually necessary, and its hole diameter has to be agreed against the bottle drawing so it locates without gripping the finish.
How does the tape or glue pattern change the strength of the box?
The closure holds the flaps to the panels, and the panels are what keep the corners aligned under load. A single centre-seam tape strip holds the flaps together but allows lateral movement and cannot bond the flap to the sidewall, while an H pattern or a water-activated tape adds that bond and stiffens the top of the box. Hot melt glue lines give the stiffest common closure when the pattern, the open time and the compression time are all set correctly. Specifying the pattern without specifying the sealer settings is the usual reason a sound closure fails in transit.
Can I specify a board grade by weight alone?
Not usefully. Corrugated board performance comes from the combination of liners and flutes, and two boards of the same nominal weight can behave differently depending on the liner quality, the flute profile and the converting. Specify the construction the way the boxmaker states it, as a liner and flute combination, and then require the measured edge crush and box compression values for the finished box. Any change of liner source or flute profile should trigger a new measurement rather than an assumption that the performance is unchanged.
How should the carton mark be specified?
As a layout with defined content, position, size, colour and language, not as a list of items. The commercial part normally carries the consignee, order or item number, variant, quantity, gross and net weight, outside dimensions and a carton number, and the handling part carries the pictograms and warnings the pack actually needs, including a stacking limit that reflects the real capability of the pack. Where the destination distribution centre scans deliveries, add the shipment identifier label and fix its position so it is consistent on every carton.
How do I make the carton specification enforceable?
Separate the measured items from the chosen items, state a method and conditioning beside every measured figure, and attach an approved sample that both sides retain. Then write the defect classes and the sampling level into the order, with structural defects such as a crushed corner, a missing partition or glass contamination treated as critical and cosmetic print variation treated separately. A specification that can be checked with a tape measure, a scale and a retained sample is enforceable; one that relies on adjectives is not.
What information gets the fastest and most useful answer?
Three items: the bottle drawing with its diameter, height and weight, the pack format including bottles per carton, insert type and whether the box is hand or machine packed, and the transport method with the intended stack height on the pallet and in the container. Add the destination market if the mark or the moisture conditions are unusual. Those three items decide the box style, the board duty and the insert, and they are what allow a carton specification to be written against a real load rather than a guess.
Send the Bottle, the Pack Format and the Shipping Method
To get a carton specification that matches your shipment, send three things: the bottle drawing or sample details with diameter, height and weight; the pack format you intend, including bottles per carton, the insert or partition you have in mind, whether the carton is hand or machine packed, and the pallet pattern with the stack height; and the shipping method, covering the route, the mode of transport and the handling at both ends. If the destination market has its own marking or moisture requirements, add that as well.
With those in hand, the reply can set out the box style that suits the load, the board duty to be confirmed against the carton supplier’s measured data, the insert design with its cell pitch and height, the closure pattern with the sealer settings, the mark layout, and the acceptance clauses with defect classes and a sampling level. That is the document you can hand to a carton supplier, a forwarder and a receiving warehouse and expect the same answer from all three.
