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TECNOLOGÍA
TECNOLOGÍA VESTIBLE
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.
Intermedio
Factory process
Instrucciones
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.
Materiales para este paso:
Roca de esmeril1 as requiredHerramientas necesarias:
Trituradora de roca
Juego de tamices (malla graduada)
Clasificador por aire
Tanque de decantación2
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.
Materiales para este paso:
Tela de algodón1 as required
Cola de piel animal1 as requiredHerramientas necesarias:
Línea de recubrimiento abrasivo3
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.
Herramientas necesarias:
Línea de recubrimiento abrasivo4
4
Size coat
Size coat
Apply a second layer of adhesive, the size coat, over the grit to fix it in place.
Materiales para este paso:
Cola de piel animal1 as requiredHerramientas necesarias:
Línea de recubrimiento abrasivoMateriales
3- 1 as requiredMarcador de posición
- 1 as requiredMarcador de posición
- 1 as requiredMarcador de posición
Herramientas requeridas
5- Marcador de posición
- Marcador de posición
- Marcador de posición
- Marcador de posición
- Marcador de posición
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