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Views: 0 Author: Heming Paper Expert Ferrill Publish Time: 2026-11-13 Origin: heming-paper
Shipping "dead air" in an under-loaded 20GP or 40HQ container raises ocean freight cost per ton of sublimation paper by 18% to 30%. A moisture gain of just 2% during sea transit causes severe edge waving and printer head strikes on high-speed Atexco or MS lines. For sublimation paper jumbo roll container loading, a 40HQ usually carries about 26-28 MT and a 20GP about 22-25 MT, so the lowest freight cost per ton comes from filling a box to its weight limit, not only to its volume.
Weight alone does not protect the paper. Sealed rolls need moisture barrier wrap and desiccant so RH, or relative humidity, stays stable at sea. Without them, the rolls face container rain: moisture that condenses on the inside of the steel container roof and walls as temperatures swing during the voyage, then drips back onto the cargo.
Table of Contents
We are Zhejiang Heming New Material Technology Co., Ltd. (Heming Paper), and we ship FCL from Shanghai, Ningbo, and Shenzhen to US buyers every month. Below is our mill-tested blueprint for FCL loading, moisture-barrier packing, and slitting yield. It rests on three levers you control: tonnage per box, moisture protection, and slitting yield.
Each of these three levers can be set before the purchase order is signed, so none of them has to be fixed after the container arrives.
A 40HQ usually carries about 26-28 MT of paper, and a 20GP about 22-25 MT.
Cost per ton falls when you load to the weight limit, not just to the volume limit.
Light GSM grades fill a box by volume first, and heavy grades hit the weight limit first.
Hold 45-55% RH at slitting and keep rolls sealed until they reach the print room.
Aim for edge trim loss below 1.5%-2% by nesting mini roll widths across one deckle.
Wood pallets bound for the US must carry the ISPM-15 stamp.
Picture a US print house ordering 1.62m and 3.2m rolls for an Atexco line. Before we can plan that load, the buyer has to lock in five inputs on the order, because sublimation paper jumbo roll container loading starts with the spec sheet, not the box. Each input changes a roll's weight and how much room it takes.
Our sublimation transfer paper runs 29-95gsm, in widths from 0.21m to 3.2m. Sublimation paper jumbo rolls run 6,500m-15,200m long on 3" or 6" cores, and they suit MS, Atexco, Epson, HP, Flora and Mimaki printers. The five inputs every load plan needs are:
gsm, the paper basis weight
width of each roll
roll length in meters
core size, 3" or 6"
the target printer platform
One wrong width on the order breaks the whole stowage plan, because every roll position in the box is set from that number.
The printer platform matters too. A wide Atexco or MS industrial line takes long rolls on large cores, while a desktop Epson setup needs short, narrow rolls. That choice sets roll length, which then sets weight per roll and how many rolls fit.
Confirm the core diameter before the load plan, because a 3" core and a 6" core put different roll diameters and weights into the same box.
Roll weight in kg equals gsm × width in m × length in m ÷ 1,000, plus the core. A 1.62m roll that is 10,000m long at 45gsm comes to about 729 kg of paper. You can run the same math for any line on your spec sheet.
The gsm band decides how a load behaves. Light bands of 29-33gsm fill the box by volume before they reach the weight limit, while heavy bands of 80-95gsm reach the weight limit first. Mid bands sit between the two.
gsm band |
Typical use |
Effect on roll weight |
Loading tendency |
|---|---|---|---|
29-33gsm |
High-speed fast-dry printing |
Lightest per meter |
Fills by volume first |
42-52gsm |
General textile printing |
Light to medium |
Near balance |
62-70gsm |
Heavy ink loads |
Medium to heavy |
Near weight limit |
80-95gsm |
Hard goods and heavy coverage |
Heaviest per meter |
Hits weight limit first |
A quick check helps here. Double the gsm on the same width and length, and the paper weight doubles too. That is why two orders with the same roll count can land very differently against a payload.
Add core and packaging weight, usually a few percent of gross, before you compare a roll against the container payload.
For most 42-70gsm orders, the 40HQ gives the lower cost per ton. It carries about 26-28 MT of paper, compared with about 22-25 MT in a 20GP, so the 40HQ wins for most light- and mid-gsm orders. The 20GP wins only for heavy 80-95gsm orders or for orders under about 22 MT.
The trade-off is payload against volume. A box that runs out of floor space before it reaches its weight limit carries dead air. A box that reaches its weight limit with space left over is doing its job.
A 20GP measures about 5.89 × 2.35 × 2.39m inside and carries 22-25 MT of paper. Heavy grades suit it well, because dense rolls reach the weight limit in a small space. Light grades leave it short on weight, which wastes what you pay for the box.
The 20GP has one more catch in the US. Road weight limits often cap a heavy 20GP, since a full box plus chassis can exceed legal truck weight. A carrier may then refuse it or split the load.
A 40HQ measures about 12.03 × 2.35 × 2.69m inside and carries 26-28 MT of paper. The extra length and height give light and mid gsm rolls room to reach real tonnage. That is why most of our FCL ocean freight for US buyers moves in 40HQ boxes.
The 40HQ does not double the payload of a 20GP, even though it holds about twice the volume. Heavy rolls can hit the weight limit with the back half of the floor nearly empty. That makes it a poor match for an all 80-95gsm order.
Book the 40HQ for light and mid gsm orders, and book the 20GP for heavy grades or small tonnage. For a mixed order, add up the gross weight first, then see which box you fill closest to its limit. The box you fill nearest to payload gives the lowest cost per ton for 20GP 40HQ container loading.
Ask your US drayage carrier for the axle weight limit before you book a fully loaded 20GP.
A standard container is 2.35m wide inside, and that width sets every layout. A 3.2m roll cannot stand across the box, so it must load lengthwise or on end. A 1.62m roll and a 1.83m roll do not fit side by side across 2.35m, so combine them along the length instead.
Those limits shape how we pack mixed sublimation paper jumbo rolls. The goal is to fill the floor and the height without leaving pockets of air. Two patterns cover most of our mixed orders.
Pattern one: 3.2m rolls stand on end in a row down the centerline. On end, a 3.2m roll uses the box height, so it needs a 40HQ with its 2.69m inside height or less length. Narrow rolls on end then line both sides of that center row.
Pattern two: narrower rolls fill the gaps. A 1.62m roll lies lengthwise beside a 1.83m roll set end to end, so the pair runs down the box. Short widths such as 0.6m then plug the corners and the space near the door.
Weight placement matters as much as fit in 20GP and 40HQ container loading. Lay the heaviest rolls over the center of the floor, so the box stays level on the chassis and the crane. Weight concentrated at the door end breaks the balance and can tip the load during lifting or braking.
Ask for a stowage drawing with each roll's weight before loading, not a photo after it.
Start with one question: does your receiving warehouse own a roll clamp? If it does, floor loading usually fits more tonnage, because it carries no pallet weight or height. If it does not, floor loading is the wrong choice, since a forklift alone cannot safely lift a bare jumbo roll.
Palletized loading has its own rules for FCL ocean freight to the US. The US requires ISPM-15 heat-treated or fumigated pallets for all wood packaging. In return, pallets protect roll edges and make forklift unloading easy at sites without clamps.
Method |
Tonnage effect |
Unloading equipment needed |
Edge risk |
|---|---|---|---|
Palletized |
Lower, pallets take weight and height |
Standard forklift |
Low |
Floor-loaded with clamps |
Highest |
Forklift with roll clamp |
Medium |
Floor-loaded on end |
High, uses box height |
Roll clamp with rotation |
Medium to high on bottom edge |
Edge risk also ties to packing. Pallets lift the rolls off the floor, which keeps the bottom edge away from any water on the deck. With floor loading, the moisture barrier packaging and a clean, dry floor do that work alone.
Check the ISPM-15 stamp on every pallet, because an unmarked pallet can hold up the whole container at US customs.
Moisture control starts at the slitter, not at the port. We hold 45-55% RH in the slitting room, so the paper is sealed at the same moisture it should keep at sea. A roll sealed while damp carries that problem inside its own wrap.
From there, the seal has five layers of defense, applied in a fixed order. Skipping one leaves a gap the others cannot close.
PE stretch film around the roll
PE-coated kraft or foil wrap over the film
Core end-plugs in both ends
CaCl2 desiccant poles hung in the container
Container inspection before loading
We check RH on the slitting floor before each run starts. If the room drifts above 55%, we hold the job until the air returns to range. Paper slit and sealed in range starts the voyage flat and stable.
PE stretch film goes on first, tight against the paper, to block air. PE-coated kraft or foil wrap then adds a second barrier and guards the surface against scuffs. Core end-plugs close the hollow center, where damp air would otherwise reach the inner wraps.
Rolls stay sealed until use, even in the buyer's warehouse. Store them on a horizontal rack that supports the full length of the roll. A rack that holds only the ends lets the middle sag and flattens the round shape.
CaCl2 desiccant poles hang along the container walls and soak up moisture from the air. That lowers the water available for rain in the container. They work best in a sealed box with no outside leaks.
So the container itself must pass inspection. It has to be dry and clean, and free of nails and holes. A single pinhole in the roof lets in daylight and, at sea, water.
Leave the wrap on until the roll reaches the printer room's own conditions.
A roll with wavy edges goes onto an MS press, and within minutes the heads start to scrape. That is edge waving at work: wavy edges lift the paper into the print heads and cause head strikes on high-speed Atexco and MS lines. The damage starts long before printing, back in the container.
Moisture also causes curl and uneven ink drying. Curl makes the sheet fight the platen, and uneven drying leaves soft or blotchy color on the transfer. A roll with these faults can lose far more than its edge trim loss, which adds to paper slitting loss.
Spot the problem at the door, not at the press. Four checks on arrival tell you if the seal held:
Torn or wet wrap on any roll
Wavy edges on the roll ends
Desiccant poles full of liquid
Water stains on the core
A full desiccant pole is a warning, even if the wrap looks dry. It means the box held a lot of water during the voyage. Open one roll from the top tier first, since container rain falls there before anywhere else.
Photograph torn wrap or full desiccant poles at the door before you sign for the container.
Keep edge trim loss below 1.5%-2% of the deckle, the usable paper width across the master roll. Plan mini roll widths in multiples that fit the deckle, or paper slitting loss climbs fast. Two 1.62m mini rolls, for example, use 3.24m, which does not fit a 3.2m deckle.
Small width changes fix most of that waste. Swapping one width can turn an order that will not slit into one that wastes almost nothing. The table shows three mixes against a 3.2m deckle.
Mini roll width combination |
Total used width |
Trim loss level |
|---|---|---|
2 × 1.62m |
3.24m |
Does not fit |
1.62m + 1.52m |
3.14m |
About 1.9%, within target |
1.83m + 1.3m |
3.13m |
About 2.2%, above target |
Trim loss also feeds back into cost per ton. Every trimmed strip still counts in gsm roll weight at the mill, yet it never reaches your press. So a mix that wastes 3% raises the real price of every usable meter.
Send your full-width mix with the order, so we can nest the widths across one deckle.
Say a buyer is finalizing a 40HQ order of 45gsm rolls in 1.62m and 1.52m widths. Before the booking goes in, every line of the load plan should be fixed in writing, because a late change forces a new stowage drawing. We work from the same six items every time.
GSM and width mix
Core size, 3" or 6"
Container type, 20GP or 40HQ
Handling method, palletized or floor-loaded
Packaging spec
Port of loading
Never book a container until the gsm and width mix is final, because every other item on the plan depends on it.
We ship FCL ocean freight from Shanghai, Ningbo, or Shenzhen. The port you choose also affects how far the rolls travel by truck from our mill to the dock. Shorter road legs mean less handling and fewer chances to damage the wrap.
Lock the port of loading early, because Shanghai, Ningbo, and Shenzhen can differ in sailing dates.
The weight limit, not the volume, sets your cost per ton. A box that reaches its payload spreads the freight over the most paper, and a box full of air spreads it over less. Pick the container and the GSM mix together, and the tonnage follows.
The second decision is the seal. Moisture protection has to hold from the slitter to the printer, with no break at the port, on the water, or in your warehouse. If one layer fails, flat sublimation paper jumbo rolls can arrive wavy, and the press pays for it.
Both decisions happen on paper, before any roll is cut. Send Heming Paper your gsm and width mix, and we will return a container load plan.
A 40HQ usually carries about 26-28 MT of sublimation paper, depending on gsm. Light grades near 29-33gsm tend to fill the box by volume before they reach full weight. Mid grades from 42-70gsm usually get closest to the top of that range, which is why they make the best use of a 40HQ.
Yes, the US requires ISPM-15 heat-treated or fumigated pallets for all wood packaging. Floor-loaded rolls avoid the requirement entirely, since they ship without wood underneath. If your warehouse has a roll clamp, floor loading removes both the pallet rule and the pallet weight from your load.
Desiccant poles typically last for a voyage of several weeks. They absorb moisture until they are full, then stop working. Check them when you open the container: a pole full of liquid means the box held heavy moisture, and you should inspect the top rolls first before you sign.
Yes, you can mix GSM grades in one container. Put the heavy grades low and centered on the floor, with lighter grades above and toward the ends. That keeps the center of gravity low and stops heavy rolls from crushing lighter ones during a rough crossing.
Store sublimation paper at about 45-55% RH. That matches the range we hold at slitting, so the paper keeps the same moisture it had when sealed. Rooms well above that range can cause curl and wavy edges, while very dry rooms can make the paper brittle and prone to static.
A 6-inch core suits long, heavy jumbo rolls on industrial lines such as MS and Atexco. The wider core supports more weight and resists crushing under a 10,000m or longer roll. A 3-inch core fits smaller rolls and many desktop or mid-size printers better, so match the core to your press.
