A carder has a drum formed as a hollow cylinder having a drum wall, a longitudinal axis, a circumference, an outer surface, a length, and a clothing provided on the outer surface. Working elements are arranged relative to the outer surface of the drum. Stub axles or a continuous axle is formed along the longitudinal axis of the drum and connected to the drum wall by spokes or disks. One or more acceleration sensors that measures structure-borne sound are mounted on one or more of: a side of the drum wall facing the longitudinal axis, the stub axles, the continuous axle, the spoked, or the disks within the length of the drum.

A carder has a drum formed as a hollow cylinder having a drum wall, a longitudinal axis, a circumference, an outer surface, a length, and a clothing provided on the outer surface. Working elements are arranged relative to the outer surface of the drum. Stub axles or a continuous axle is formed along the longitudinal axis of the drum and connected to the drum wall by spokes or disks. One or more acceleration sensors that measures structure-borne sound are mounted on one or more of: a side of the drum wall facing the longitudinal axis, the stub axles, the continuous axle, the spoked, or the disks within the length of the drum.

Disclosed is a chute carding machine used in a recycled carbon fiber nonwoven fabric manufacturing system, wherein the chute carding machine includes a main chamber oriented in a vertical direction and having an inner space formed therein, a mixed raw material introduction unit is installed at the uppermost part of an inner space of the main chamber, a first carding unit is installed under the mixed raw material introduction unit, a second carding unit is installed under the first carding unit, and a web shaping unit is installed under the second carding unit.

Disclosed is a chute carding machine used in a recycled carbon fiber nonwoven fabric manufacturing system, wherein the chute carding machine includes a main chamber oriented in a vertical direction and having an inner space formed therein, a mixed raw material introduction unit is installed at the uppermost part of an inner space of the main chamber, a first carding unit is installed under the mixed raw material introduction unit, a second carding unit is installed under the first carding unit, and a web shaping unit is installed under the second carding unit.