Corrugated Board Crush Problems: Caliper Loss, Flute Damage, and Pressure Marks Corrugated board crush usually starts as a very practical production problem. The sheet feels softer than normal. The board caliper is lower after one section. A straight pressure band appears across the width. When the board is cut open, the flute profile looks lower […]

Corrugated Board Glue Application Problems: Uneven Glue Film, Dry Spots, and Squeeze-Out A corrugated glue problem often appears as a simple board defect: dry flute tips, weak bonding, wet glue lines, or starch squeezed outside the contact area. On the machine, the same board may show two opposite signs at the same time. One lane

Nonwoven Thermal Bonding Defects: Weak Bonding, Over-Bonding, Stiffness, and Pinholes Weak bonding, hard hand feel, shiny bond points, pinholes, or small damaged spots usually appear right after the thermal bonding or calender bonding section. The fastest useful check is to mark where the defect appears before changing the machine setting. Full-width weakness, one-side weakness, one

PVC Coated Fabric Calendering Problems: Gloss Variation, Streaks, and Surface Build-Up PVC coated fabric or tarpaulin can look fine before the calender nip, then show dull bands, glossy strips, long streaks, sticky areas, or residue on the roller face after pressure contact. Many lines first try cleaning. The surface improves, the roller runs for a

Fabric Padding and Finishing Problems: Uneven Wet Pickup, Shade Variation, and Chemical Carryover Uneven wet pickup, shade difference, chemical carryover, or a changed fabric hand often starts at a small difference in the padding section. The fabric may look acceptable at first, then the problem becomes clearer after drying or curing. Start by checking the

Fabric Squeezing and Dewatering Problems: Wet Bands, Uneven Moisture, and Pressure Stripes Fabric squeezing looks simple when the line is running well. The fabric enters wet, passes through the squeeze nip, and the dryer receives a more stable load. Problems start when the fabric leaves the nip with wet bands, one side stays heavier, the

Battery Electrode Web Surface Defects After Roller Contact: Micro-Compression, Particle Pickup, and Scratches A coated electrode web may pass coating and drying with an acceptable surface, then show tiny bright dots, pressed particles, or fine scratches after one roller position. The marks can be small enough to miss during normal viewing, then become clear under

Battery Separator Film Roller Contact Problems: Scratches, Static Marks, and Particle Contamination A separator roll can look clean on the upstream side and still show fine lines, small dots, or static-like traces after one guide, transfer, traction, or contact section. Sometimes the mark is too light to notice at first. It only becomes clear after

Battery Separator Film Slitting and Rewinding Problems: Wrinkles, Edge Damage, and Static Dust Battery separator film problems during slitting and rewinding are often first noticed on the finished roll: a light wrinkle, a fuzzy slit edge, powder near the edge, dust on the surface, or a roll edge that no longer builds cleanly. The defect