ELECTRONIC CONICAL TABLE

Visual method of inspecting the yarn uniformity requires wrapping the yarn on a board and comparing it to a standard

sample. In addition to yarn regularity, periodic defects such as moiré effect can also be determined when the yarn is

wrapped on a taper board.

Lawson-Hemphill Conical Table uses Transverse Mechanism to wrap the yarn around a Taper Board. This mechanism

ensures yarn wraps are equally spaced on the board as per yarn count. ASTM D 2255 provides a reference table for

proper spacing. The standard version of the Taper Board instrument is equipped with one Yarn Carrier. Dual Yarn

Carriers for comparing two yarns side by side and Double Step version to double space between each wrap are also

available as special versions for heavier yarns or fancy yarns.

When the test starts, the Yarn Carrier is placed at the narrowest part of the taper board. As the wrapping continues,

the yarn carrier will continue to bring the yarn towards the wider parts of taper board. The winding will stop

automatically when the carrier reaches the widest part of the board. The taper board can then be removed to inspect

the yarn. During the winding, the yarn is under tension. The winding speed is manually adjustable and the machine

can be stopped at any