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It originally consisted of metal or wooden slats with internal elastic bands connected to angled end plates (Fig.
This soft, grooved rubber roller has a patented design featuring angled grooves that increase in depth from the center of the roll to each end for improved spreading action.
PHOTO : which when angled, shifts the web direction from the roll's center outward toward the ends
3--Elastic expander rollers have rubber or elastic cords attached to angled end