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| Tip 4
Why do transparent papers quickly become wavy? |
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The reason lies in the fact that transparent papers react more sensitively than other papers to changes in moisture.
Transparency is achieved by a particularly intense grinding of the fibres. This enlarges the surface area of the fibres and releases substances that swell or shrink like a gel under the influence of moisture. These reactions also make the sheet denser and impervious to steam.
You can conduct a simple experiment to illustrate this imperviousness by (carefully) lighting a match underneath a sheet of transparent paper. Blisters form on the paper and these burst because the moisture content of the paper cannot escape.
The only remedy is to ensure that the ambient conditions are correct. Excessive moisture in the air gives rise to wavy edges, and cockling occures if the air is too dry. If the climatic conditions cannot be controlled, it is best not to unpack the paper until immediately before printing and then to cover it loosely with foil.
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