Summary: The Business Case in Brief
You know the frustrating scenario: you print a beautiful, full A0 poster or render with a lot of ink (dark areas). As soon as the print comes out of the machine, the paper curls up at the edges like a banana peel. Or even worse: the paper rises while printing, the printhead hits the paper with a loud bang (“Head Strike”), leading to dirty ink smudges (smearing) and possible permanent damage to the expensive printhead. The first reaction of the user is often: “Stupid printer! It’s broken.” But in 80% of cases, the culprit is invisible and external: Humidity. Paper is a natural product (wood fiber). It is hygroscopic: it sucks up water from the air or releases it. If you do not control this physical process, you will structurally lose money on failed prints and damaged hardware.
The Science of Paper and Water
Paper consists of a network of cellulose fibers. These fibers react strongly to moisture.
1. High Humidity (Summer, Rain, Poorly ventilated basement)
If the humidity is high (>60%), the paper in the roll absorbs moisture. The fibers swell and expand.
- But the paper is tightly rolled on a core. It has nowhere to go.
- As soon as you unroll it (print), the paper relaxes and expands unevenly.
- Result: The paper begins to wave (“Cockling”). If you then also spray wet ink on it, the paper becomes as limp as a washcloth. The printer cannot keep it flat, resulting in head crashes.
2. Low Humidity (Winter, Freezing cold, Central heating on high)
In the winter, when the heating is blasting, indoor humidity often drops to <30%. The paper becomes bone dry.
- Static Electricity: Dry paper builds up an enormous static charge due to the friction in the printer. It attracts dust and sticks to everything (Jamming in the stacker).
- Shrinkage: The paper shrinks at the edges (where it is exposed to air), but not in the middle (on the roll). This causes “Tight Edges”.
- Ink Absorption: The ink dries too quickly, even before it can soak into the fiber. This leads to faded colors and ink that remains on the surface and flakes off easily.
The Problem of “The Open Roll”
The biggest mistake we see in offices and construction site huts: There are 3 rolls of paper standing upright in a corner, without packaging, waiting for months. Or there is a roll in the printer that hasn’t been used for 4 weeks.
- The outer layers of that roll are completely exposed to the fluctuating indoor climate (warm/dry during the day, cold/damp at night).
- The inside of the roll is still protected by the wrapping.
- Consequence: Tension Mismatch. The roll warps internally.
- If you go to print after 2 weeks, the printer is guaranteed to jam in the first 2 meters, because the paper is physically no longer flat.
The Solution: Climate Control & Storage
You don’t need to create a museum climate, but a few basic rules of “Good Housekeeping” help enormously.
1. Keep paper in the box (and the bag!)
Don’t need a roll for a while? Take it out of the printer.
- Put it back in the plastic bag. This acts as a moisture barrier.
- Put it back in the box. This protects against UV light (yellowing) and dust.
- Store the box horizontally, or use the end caps to store it vertically without damaging the edges.
- This takes 1 minute, but saves you the frustration of the first 5 meters of paper (waste) that you would otherwise have to throw away at the next session.
2. Acclimatize (Important!)
Let new paper (which has just come out of the courier’s freezing cold van) sit in the print room (in the box) for 24 hours before you open it. If you put freezing cold paper into a warm printer, condensation forms immediately on the paper. That is asking for trouble.
3. Choose the right paper for the job
- Do you print a lot of solid fills (large photos, geographical maps, renders)? Then do not use cheap 80-gram CAD paper. That is too thin to carry the ink load and will always start to wave.
- Use 90-gram or preferably 120-gram Coated paper. The coating ensures that the ink does not soak into the fiber (causing it to expand), but remains on top. The paper stays flatter.
- For photos: Use “Instant Dry” photo paper. There is a PE (Polyethylene) barrier layer between the paper base and the coating. It is basically plastic; it cannot absorb moisture and therefore remains perfectly flat, no matter how wet you make it and how humid the room is.
Business Fundamentals: Waste Reduction
A roll of paper costs € 20 - € 50. A printhead costs € 300.
- If you have to throw away 10 meters every month due to poor paper management and damage a printhead 1x a year due to a crash, the costs are considerable.
- Proper storage is free and only requires discipline.
Europlan Service: Media Advice
We don’t just sell “paper”. We sell media that are tested and certified for your specific machine (HP/Canon/Rowe). We know which rolls are suitable for High Ink Density and which are purely for lines.
Conclusion: Respect the Material
Paper is a living, organic material. Treat it with care, and your printer will reward you with trouble-free production and pristine prints that lie flat on the table in the conference room.
Do you want to know which paper is best for your specific prints?