Felt Side - What does felt side mean?

Definition of FELT SIDE:

Paper has two sides; the felt side is the side of the web that did not come into contact with the forming wire (a moving mesh wire belt) in the paper machine during the manufacturing process. The felt side usually contains the remnants of the smaller fibres and filler elements that were not lost during the manufacturing process, meaning that it is generally weaker than the wire side. The grain is less pronounced on this side, making it the preferred side for alternative applications such as stationery that will be handwritten - particularly with a pen and ink - and is generally used when printing letterheads or to form the outside part of envelopes.

Here is the Harvard-style citation to use if you would like to reference this definition of the term felt side:
Label Planet (2020) What does felt side mean? | Felt Side Definition. Available at: https://www.labelplanet.co.uk/glossary/felt-side/ (Accessed: January 1, 2024).