INDUSTRIES

Textiles, Carpet and Non-wovens:

Presently, moisture control of textiles, carpet, and non-wovens suffers from the lack of effective moisture sensors upon which to base a control system. Most moisture control is by feel or sight, or at best is measured “after-the-fact”-- downstream of the dryer, range, tenter frame, etc. The best defense against field complaints is to over-dry rather than produce wet product; however, such practice is costly in terms of lost production, poor product quality and increased unit energy consumption. The Delta T moisture control system has been successfully used in textile, carpet and non-woven applications to solve moisture control problems.

Textiles:

Textiles are dried using such dryer-types as tenters, ovens, can, loop, tumble, relaxed, impingement, etc. Due to the inability of conventional moisture sensors to effectively operate in the environment of a dryer, moisture control is usually based on the operator’s skill in determining moisture content by feel or sight. The patented Delta T moisture/dryer control system is based on a unique moisture sensor that requires no calibration and can operate in the harsh environment of the dryer. (more info) Its unique moisture sensor consists of the difference in two temperature measurements (delta t) and a math model relating moisture to the temperature difference. The sensor value corresponding to moisture content at or near the product regain moisture content is quickly determined on-line, and the control system maintains that value in spite of changes entering with the wet product. It has been applied to tenter and loop dryers with extraordinary improvements in production, quality and energy conservation. (article) (more info)

Dryers: tenter loop tumble can relaxed

Carpet:

Due to the ineffectiveness of conventional moisture sensors, carpet moisture control is usually based on the operator’s skill is use of sight and feel to estimate the moisture content of the product exiting the dryer. The patented Delta T moisture/dryer control system is based on a moisture sensor consisting of two temperature sensors and a mathematical model relating the carpet moisture to the difference in the two temperature measurements (delta t). The Delta T moisture sensor is unique in that it can operate inside the harsh environment of a dryer, requires no calibration, and employs cruise-control startup. The set point temperature drop value that corresponds with regain or near regain moisture content is quickly established, and the Delta T maintains that target moisture content value in spite of water load changes entering with the feed, including the periodic addition of water repellant solution. A Delta t system was installed on a flow-through tenter and performed excellently. No additional production was desired, therefore, the effect of operating at higher moisture content gave a 17 % reduction in unit energy consumption. The product moisture content exiting the dryer was increased 1.5% and maintained at + or - 0.2% of target. A carpet coater was also controlled by a Delta T with equal success. (more info) (more info).

Dryers & Coaters: flow-through impingement screen drum cylinder split-zone heat setting

Non-wovens:

The moisture content of rayon and cotton fibers has been successfully controlled with the Delta T moisture/dryer control system. Moisture content variation is reduced at least by 30% and some times more. This allows the mean product moisture content exiting the dryer to be increased without exceeding the established upper specification limit, thus enabling production increases, improved product quality, and reduced unit energy consumption.