Quick Answer:
Short Answer
Center guiding averages edge defects, ignores wrinkles, and ensures symmetric margins for coating/laminating.
Center guiding provides three key advantages: First, it naturally averages out edge defects and fuzzy nonwoven edges, resulting in more stable control. Second, it is immune to wrinkles—when a wrinkle narrows the web, center guiding sees the width reduction on both sides and maintains the true centerline. Third, for symmetric processes like coating or laminating, maintaining the centerline ensures equal margins on both sides. Edge guiding would require the web edge to stay perfectly straight, which is challenging with materials like nonwovens.