What is the TAPPI standard for Warp?
1/4" of warp allowed in a 12 inch span measured anywhere on the sheet.
This information is found in Tappi standard "TIP 0304-13, Statistical process control - procedures for charting warp".
Easiest way to test is to use a 12 inch steel rule and lay it on your sheet, if the gap between the sheet and the rule is less that 1/4" it is typically within Tappi standards.
With todays high speed converting machinery this is no longer an exceptable standard in many manufacturing facilities, especially for high graphics print jobs.
Towels are woven. Towels are woven on dobby looms, meaning each loom has two sets or warp and thus two warp beams-one warp is called the ground warp and forms the body of the towel and the other is called the pile warp and it produces the terry pile or loop. Read more: http://www.answers.com/topic/bath-towel-2#ixzz2ATHmFCvJ