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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.
中级
Factory process
说明
1
1
Crush and grade the grit
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.
此步骤所需材料：
金刚砂岩1 as required所需工具：
碎石机
筛组（分级筛网）
气流分级机
沉降池2
2
Make coat
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.
此步骤所需材料：
棉布1 as required
兽皮胶1 as required所需工具：
涂附磨具生产线3
3
Coat with grit
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.
所需工具：
涂附磨具生产线4
4
Size coat
Size coat
Apply a second layer of adhesive, the size coat, over the grit to fix it in place.
此步骤所需材料：
兽皮胶1 as required所需工具：
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