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T

T-RING COVER

A method of sewing the ring cover onto a bag in which the ring is in the top of the "T" and the two ends of the ring cover are sewn flat together against the bag.

TAKE-UP (SEAM)

The amount of fabric gathered in a seam over a given length of seam. Normally expressed as a percentage. Over a longer bag this take-up can cause bowing of the bag.

TAPERED BAG

A filter bag in which one end is smaller than the other. Done by folding the end of the bag or actually cuffing one end smaller, like a cone.

TEMPLATE

A semi-permanent pattern, which is drawn around or marked through. Normally small parts are cut with the template.

TENSILE STRENGTH

The force required to pull apart the fabric; this is designated by the measure of resistance to a testing machine (in pounds) that a fabric provides before the material breaks. The test strip width depends on the type of fabric.

TEXTURIZED (BULKED) YARN

Filament glass yarn that has been processed by high-pressure air passing through the yarn to open up the yarn bundle, providing more surface area.

THERMAL STABILITY

Refers to the maximum amount of shrinkage or elongation that could be experienced when a fabric is exposed to operating temperatures on the upper edge of its temperature range.

THREAD COUNT

The number of warp and filling yams in a fabric.

THREAD ROLLBACK

Thread rollback or popback is when a chain stitch is cut it will pull back several stitches before it is caught. This occurs primarily when thread tension is high and the thread is stretched.

THREAD TENSION

The amount of tension used to retard the flow of thread through a set of discs to give an even stitch so that the stitch is not too tight or too loose.

THROUGHPUT

The amount of solution which will pass through a filter prior to it clogging.

TIMER

Relative to the baghouse, the time is the electrical mechanism that activates the cleaning cycle; often referred to as the timer panel or the controller can be a modern style printed circuit board, a PLC or an old style cam timer.

TITLE V

The portion of the Clean Air Act that deals with permitting of pollution sources.

TRICKLE VALVE

A device for continuous removal of collected dust where the hopper is under negative pressure. The valve's hinged flap gate is kept closed by a counterweight until collected material builds up sufficient weight to overcome the counterweight.

TUBER

A sewing machine equipped to sew fabric into a tube. Done from rolls or pieces. Most often a chain stitch machine.

TUBESHEET (CELL PLATE)

The steel plate to which the open ends of bags and cages are connected; separates the clean air and dirty air sections of the baghouse.

TURN BACK (CUFF)

Distance measured on tube to allow a cuff to be formed from the tube itself.

TURNING VANES

A gas distribution device in which vanes in ductwork or transition guide the gas and dust flow to minimize pressure drop and control the velocity and dust concentration contours.

TWILL WEAVE

Warp yarns floating over or under at least two consecutive picks from lower left to upper right, with the points of intersection moving one yarn outward and upward or downward on succeeding picks, causing diagonal lines in the cloth. It is one of the three basic weaves, the others being plain and satin (see SATIN). Twills are the predominant weave patterns used in filtration because of the surface area it offers.