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Filter Paper: Soft, Unsized Paper from Linen Rags

Rhetos (Wikimedia Commons) · CC0

أنشأه

Charlie

14. أكتوبر 2026

Filter Paper: Soft, Unsized Paper from Linen Rags

Filter paper is paper left soft and porous: made like ordinary rag paper but never sized, so liquid runs through it and solids stay on top. Pharmacists once used such a paper, charta emporetica, for filtering.

مبتدئ

Two days

التعليمات

Watch: making linen paper by hand

Old linen made into sheets with a mould and deckle.

Cut and cook the rags

Cut clean linen rags into small pieces. Make a lye by soaking wood ash in water and pouring off the clear liquid, then simmer the rags in it for a few hours to soften them. Rinse well.

المواد لهذه الخطوة:

خرق كتانية1 كغ

رماد خشب صلب1 as required

ماء1 as required

الأدوات المطلوبة:

مقص

دلو

قدر كبير

Beat to pulp

Beat the rags with a mallet, a handful at a time with a little water, until the fibres separate into pulp.

الأدوات المطلوبة:

مطرقة خشبية

Form the sheets

Stir the pulp into a vat of water. Dip the mould and deckle, lift it level and let it drain.

المواد لهذه الخطوة:

ماء1 as required

الأدوات المطلوبة:

حوض خشبي كبير

غربال الورّاق وإطاره

Couch, press and dry — no size

Turn each sheet onto a damp felt, stack felt and paper, press out the water and hang the sheets to dry. Do not size them: unsized paper stays porous, which is what lets it filter.

الأدوات المطلوبة: