POLISHING WITH A 4-6-8-12 ROLL POLISHING MACHINE
These complex multi-roll machines for polishing flat parts only (picture 5) are suitable for heavy duty uses and allow employers to use different types of paste at the same time.
Picture 5 - multi rollers buffing machine for solid abrasive paste (in sticks)
These pastes, however, must be added in a logical order:
-the first rollers should have the more abrasive paste
-the last rollers the higher polishing paste.
Employers therefore need to pass gradually from the first to the penultimate roller from the abrasive to polishing paste: the last roll must be always free for degreasing the item before final polishing.
Each roller has a paste loader (picture 6) with mobile carriage which holds the sticks or bars of abrasive paste.
Picture 6 - abrasive stick holder
Optimum working temperature (produced by the pressure of the rollers on the surface to be polished) is between 25 °C and 40 °C (77 °F - 104 °F).
Recommended products for multi-roll polishing machines:
Polyester films must be final sanded with sandpaper 600: on first rollers it is recommended a very abrasive paste (hard grain) while on last rollers a paste with good polishing properties (medium-fine grain).
Polyurethane films must be final sanded with sandpaper 800: on first rollers it is recommended a fairly abrasive paste (medium hard grain) while on last rollers a very polishing paste (fine grain).
|