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B

BACK TACK

To sew over a previously sewn seam or stitch to prevent the thread from unraveling.

BACKWASH

Reversed flow through a filter medium to remove filtered solids.

BAFFLE

A device usually consisting of a plate or series of plates which evenly distribute airflow and dust within a dust collector to protect filter bags from direct impingement of dust.

BAGHOUSE

An air filtration structure utilizing fabric filter bags for the purpose of removing solid particulate from the gas stream; dust collector.

BAG-ON-CAGE

The concept of selling both the bag and cage as one unit. Normally installed together by the plant.

BAG POCKETS

Pockets sewn into the bag for placement of cages or rods. Pockets most often associated with the Sly and Pangborn type filter bags.

BAR

A unit of pressure. One bar = 14.5 psi.

BIAS MATERIAL

Material whose fill thread is not perpendicular to the warp threads; i.e., for a given plane of the fabric a given thread will be higher or lower to a line perpendicular to the edge from point to point. Caused by uneven tension and heat during weaving.

BLEED THROUGH

Particulate migration through the interstices of the filter bag fabric.

BLINDING

Fabric blockage by dust, fume, or liquid not being discharged by the cleaning mechanism, results in a reduced gas flow of increased pressure drop across the filter media.

BLOWDOWN

The use of pressure to remove liquids and/or solids from a vessel.

BLOWPIPE

Pipe connected to the pulsing system; holes distribute cleaning air to bag rows in pulse-jet units.

BOBBIN

A device used to feed thread to the needle on a lockstitch machine. Has a definite amount of thread on it and must be changed periodically.

BOWED BAGS

The shape of a bag, which has excessive take-up on the seam side. Expressed in inches and measured from the highest point of the bow to a line which would represent the bowstring.

BOWED MATERIAL

Similar to bias material except the fill thread will be pulled into the shape of a bow. Caused by a pulling or drawing of the fabric in the center of the roll during weaving.

BRIDGING

Material-handling problem characterized by the particulate forming a cavity over the discharge or opening of a hopper or storage vessel.

BROKEN BAG DETECTOR

An instruments that can detect when the particulate emissions increase significantly.

BURSTING STRENGTH

General - A material's ability to resist rupture by pressure.
Specific - Force required to rupture a fabric by distending it with the force applied at right angles to the fabric plane under specified conditions. Usually expressed in pounds per square inch.