Film Surface Defects in Converting Lines Fine lines, light marks, scratches, dust spots, coating streaks, and pressure impressions can appear suddenly on film even when the line looks stable. Sometimes the defect is seen only under light reflection. Sometimes it appears after coating, after lamination, near a cleaning point, or only after rewinding. The useful […]

What Causes Surface Lines on Plastic Sheet After Roller Contact? Plastic sheet surface lines often appear after the sheet passes a cooling roll, polish roll, traction roller, haul-off roller, or pressure roller. The line may look like a fine stripe, a gloss difference, a light pressure mark, or a repeated mark across the sheet surface.

Why Do Nonwoven Webs Show Pressure Marks or Fiber Compression? Nonwoven pressure marks often look different from marks on film or coated paper. The web may show a flattened band, a duller surface area, a changed fiber pattern, or a local loss of loft after passing a nip, pressure roller, cleaning roller, winding contact point,

What Causes Surface Marks in Coating and Laminating Lines? Surface marks on coating and laminating lines may appear as fine lines, glossy bands, dull pressure areas, coating streaks, adhesive transfer marks, or light impressions after lamination. Some marks show up while the coating is still wet. Some only become clear after drying, winding, or the

Why Does Thin Film Wrinkle Before Rewinding? Thin film wrinkles before rewinding usually show up as diagonal creases, edge folds, center wrinkles, or light cross-web lines just before the web enters the winding zone. On BOPP, PET, PE, protective film, or release film, the wrinkle may only become visible after roll build-up starts, but the

Common Textile Processing Problems Textile processing problems usually show up on the fabric first: edge drifting, wrinkles, unstable tension, wet streaks, pressure bands, shiny marks, high residual moisture, or finish damage. Start from the first place where the fabric changes. Check the edge, width, moisture profile, surface feel, tension response, and winding result. If the

Common Surface and Contact Problems in Leather and Synthetic Leather Processing Surface marks on leather or synthetic leather often start after one contact point. The product may show a light pressure mark, gloss change, flattened grain, coating transfer, drag mark, sticking, or unstable feeding. Before changing the roller specification, find where the surface first changes.

What Problems Can Roller Runout, Misalignment, or Eccentricity Cause? Repeat marks, one-side pressure bands, vibration, and web tracking drift are not always caused by the rubber surface. The cover may look clean. The hardness may still be close to the drawing. The problem may come from how the roller rotates, how it is mounted, or

Common Lithium Battery Material Line Problems Particles on separator film, static attraction around foil, faint marks on coated web, and tension drift often start as small changes around one section of the line. Dust collects after a contact area. The web edge begins to wander at higher speed. A light line appears after heated contact.