Steel Strip Bridle Roll Problems: Slipping, Tension Loss, and Speed Mismatch A steel strip may slide visibly on one bridle roll, lose the required entry-to-exit tension difference, or become unstable during acceleration. These symptoms often appear together, but they do not point to the same fault. Compare the threading route, entry and exit tension, actual

How to Choose Rubber Covers for Pickling Line Squeeze Rolls A pickling-line squeeze roll cover should be chosen by looking at where acid reaches the roller, how long each area stays wet, and how the steel strip loads the rubber. The center of the roll may handle steady squeezing pressure and short acid carryover. The

Pickling Line Squeeze Roll Problems: Acid Carryover, Wet Bands, and Uneven Strip Wiping When steel strip leaves a pickling or rinsing section with acid carryover, wet bands, or more liquid on one surface, look at the residual liquid pattern before changing the squeeze pressure. A full-width film usually calls for a different check from one

Steel Pickling Line Rubber Roll Failures: Edge Swelling, Cracking, and Cover Separation Cracking at the roller end, cracking beside a segment gap, and cracking across the full working face usually come from different failure paths. End damage often starts where acid, rinse water, or cleaning liquid reaches the side of the cover. Damage around a

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