Smoothness tester for paper - uses record desk with metal head replacing needle and digital vibration spectrum display

摘要

A smoothness tester for paper enables the surface smoothness to be determined correctly and rapidly. It is a simple device which is less expensive to make and operate than conventional testers and gives more reproducible results. The surface of a paper sample rotating on a plate is scanned by a sound head. The resulting vibration spectrum is displayed digitally using a frequency counter. A sound record player is connected to the frequency counter. Its sapphire needle is replaced by a metal head. The metal head is attached to the crystal system using a two component adhesive. Its application pressure is regulated by moving an adjustable counterweight on the player arm. A metal disc of equal dia. is placed on the deck to form a base for the paper.