Measuring the width of the web (or the cross-machine dimension of the web) is essential for various converting applications. Web width measurement is crucial for quality control and web handling purposes. Some examples of converting processes requiring width measurement include:
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Terminal web guides are devices used at the entry and exit of a roll-to-roll machine to appropriately align the web to the desired cross machine location. Entire roll of the web, on the unwind/rewind stand, is moved along the cross-machine direction for the proper alignment.
Different terms related to web guiding are discussed in this article.
Web guiding is the process of regulating the cross machine position of the web while the web is transported over the rollers in roll-to-roll processing machinery. Other terms for web guiding include:
Web is a material that is thin, flexible and continuous in nature. Web materials are transported within a machinery to convert them into finished products. A wide variety of consumer products are made from web materials such as paper, plastics, films, foils and metals, into finished products such as diapers, female hygiene products, labels, tapes, magazines, aluminum cans, and even some electronics.
Many displacement guides, steering guides, unwind / rewind guides manufactured in the 1960’s, 1970's, 1980’s and 1990's were controlled using both pneumatic and hydraulic control systems which are often referred to as pneumo-hydraulic web guides. These web guide were really common before the mass adoption of the electronic (analog and digital) controllers and electric actuators. A lot of these units were predominant in blown film lines, extrusion lines, flexographic printing presses and even in paper converting machines.