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Advances in Fiberglass Mat Online Measurement Techniques

with Eric J. Reber
Technical Director at Mahlo America, Inc.

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The online measurement of fiberglass mat historically has been of total basis weight and with some success binder content (%LOI). These older solutions have been very maintenance-intensive, marginally reliable, and usually required multiple scanning frames, which resulted in prohibitively expensive equipment, installation and maintenance costs with poor measurement performance. A new online system not only provides a measurement of total basis weight, as well as simultaneous measurements of thickness and binder content from a single location with very high accuracy and proven reliability. Further, these measurements are completely non-contacting and are unaffected by mass stratification, flutter or edge curl and tolerate very high web temperatures. Technical details of these unique measurement solutions along with long-term field results will be presented.

 

Binder and Coating Application on Wetlaid Nonwoven Glass Fiber Mat

Leo Bos
Business Development Manager Wetlaid, Andritz

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Many fiber materials are bound mechanically, thermally or chemically without additives. Wet used chopped strand glass fibers, such as those used to produce nonwoven glass fiber mat, cannot be bound without the addition of a binder.

On most glass mat production lines, the binder is applied with a so-called saturator, after the fibers have formed the mat on an inclined wire former. However, there are also lines where a binder is added directly into the sheet forming process.

In addition to this primary binder, which aims to bind the glass fibers together, a second application is sometimes used. This additional application can take place both off-line and in-line and serves to give the product specific properties that are difficult or impossible to obtain with only the composition of glass fibers and a primary binder.

Although this presentation will focus on the most common process, the binder application with the saturator, the other application methods will be presented along with their specific advantages and disadvantages. Particular attention will be paid to defects in the product, which are caused by imperfections in the application process and how the process can be improved.