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Emery Cloth: Graded Grit Between a Make Coat and a Size Coat
Mary

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Mary

11. Ukwakira 2026FI
27
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Emery Cloth: Graded Grit Between a Make Coat and a Size Coat

Emery cloth is a coated abrasive: grains of emery, a natural abrasive used for polishing metal, glued to one face of a cloth backing. Cloth is chosen over paper where durability matters. The grit is graded to one size, glued down with a make coat, and locked in with a second size coat. Hide glue is the traditional adhesive; it does not stand the heat of machine sanding and is not waterproof, so resin is used where that matters. Closed-coat cloth has 90–95% of its face covered with grain, open-coat 50–70%, which clogs less on soft materials.
Hagati
Factory process

Amabwiriza

1

Crush and grade the grit

Crush the emery, then sort it to one size: pass coarse grit through successively finer sieves, separate medium grit by air classification, and the finest by water classification, letting particles settle in a tank by how fast they sink.

Ibikoresho by'iyi ntambwe:

Urutare rwa emeriUrutare rwa emeri1 as required

Ibikoresho bikenewe:

Imashini imenagura amabuyeImashini imenagura amabuye
Agatsiko k'utuyungurizo (imyobo itandukanye)Agatsiko k'utuyungurizo (imyobo itandukanye)
Igikoresho gitondeka hakoreshejwe umwukaIgikoresho gitondeka hakoreshejwe umwuka
Itanki ryicazaItanki ryicaza
2

Make coat

Run the long ribbon of cloth backing through the coating line and coat one face with adhesive, the make coat that will bind the grit to the cloth.

Ibikoresho by'iyi ntambwe:

Umwenda w'IpambaUmwenda w'Ipamba1 as required
Ifatanyo ry'uruhu rw'inyamaswaIfatanyo ry'uruhu rw'inyamaswa1 as required

Ibikoresho bikenewe:

Umurongo usiga igisenyiUmurongo usiga igisenyi
3

Coat with grit

Drop the graded grit on to the wet make coat (gravity coating), or pass backing and grit through an electric field so the charged grit is drawn on to the backing (electrostatic coating), which holds it more strongly. Cover 90–95% of the surface for closed coat or 50–70% for open coat.

Ibikoresho bikenewe:

Umurongo usiga igisenyiUmurongo usiga igisenyi
4

Size coat

Apply a second layer of adhesive, the size coat, over the grit to fix it in place.

Ibikoresho by'iyi ntambwe:

Ifatanyo ry'uruhu rw'inyamaswaIfatanyo ry'uruhu rw'inyamaswa1 as required

Ibikoresho bikenewe:

Umurongo usiga igisenyiUmurongo usiga igisenyi

Ibikoresho

3

Ibikoresho bikenewe

5

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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