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Filter Paper: Soft, Unsized Paper from Linen Rags
Charlie

Yaremwe na

Charlie

14. Ukwakira 2026DE
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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.
Utangiye
Two days

Amabwiriza

1

Watch: making linen paper by hand

Old linen made into sheets with a mould and deckle.
2

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.

Ibikoresho by'iyi ntambwe:

Udutambaro dushaje twa linoUdutambaro dushaje twa lino1 kg
Ivu ry'Igiti GikomeyeIvu ry'Igiti Gikomeye1 as required
AmaziAmazi1 as required

Ibikoresho bikenewe:

UmukasiUmukasi
IndoboIndobo
Inkono niniInkono nini
3

Beat to pulp

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

Ibikoresho bikenewe:

Inyundo y'IgitiInyundo y'Igiti
4

Form the sheets

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

Ibikoresho by'iyi ntambwe:

AmaziAmazi1 as required

Ibikoresho bikenewe:

IgikonjoIgikonjo
Igishushanyo n'urukiramende by'ukora impapuroIgishushanyo n'urukiramende by'ukora impapuro
5

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.

Ibikoresho bikenewe:

Urupapuro rw'ubwoya bwashongeshejweUrupapuro rw'ubwoya bwashongeshejwe
Umugozi wo kumishahoUmugozi wo kumishaho
6

Cut and fold to use

Cut the sheets into circles, fold one in quarters and open it into a cone to sit in a funnel.

Ibikoresho bikenewe:

UmukasiUmukasi

Ibikoresho

3

Ibikoresho bikenewe

8

Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.

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