close
Choose Your Site
Global
Social Media
Views: 0 Author: Site Editor Publish Time: 2026-11-12 Origin: Site
The most common tissue parent roll defects are web breaks, holes, wrinkles/wavy edges, dust and lint, core crush, and perforation or slitting problems. Most are not random: they trace back to uneven web tension, misaligned rollers, moisture variation, or handling damage. On a light 13–18 g/m² sheet, tension above roughly 3.5 kg/cm² can break the web, and repeated breakouts during rewinding can reduce line speed by 20–30%. This guide gives a symptom-to-cause-to-action table so QC and converting teams can identify and correct each defect quickly.
Defect | Typical symptom | Main cause | Corrective action |
|---|---|---|---|
Web breaks | Frequent snap-offs during unwinding/rewinding | Excess tension, weak spots, dry sheet, slitting nick | Lower and balance tension; check tensile and moisture; inspect knife edges |
Holes | Pinholes or larger openings in the web | Contamination, fibre lumps, felt/roll damage, wet-end debris | Clean forming and press sections; check furnish and felt condition |
Wrinkles / creases | Wavy, folded or creped bands across the web | Uneven tension, misaligned or bowed rollers | Align rollers; use a bow (spreader) roller; rebalance tension profile |
Dust and lint | Loose fibre build-up on blades and equipment | Over-drying, dull creping/doctor blades, poor bonding | Sharpen/set blades; check moisture and refining; add dust extraction |
Core crush | Deformed or collapsed cardboard core | Rough handling, excessive winding pressure, weak core | Improve handling; reduce winding pressure; use a stronger 76 mm core |
Perforation / slitting defects | Ragged edges, uneven cuts, partial tears | Dull or misaligned slitting knives, wrong blade pressure | Replace or re-sharpen knives; reset blade pressure and alignment |
Edge cracks | Tears starting at the roll edge | Edge dryness, uneven tension, damaged edges | Seal/protect edges; balance cross-direction tension |
Moisture variation | Baggy or tight zones, weight inconsistency | Non-uniform drying or storage humidity | Check dryer profile; control storage at stable humidity |
A web break is the costliest defect because it stops the line and generates waste. Light 13–18 g/m² tissue is especially sensitive: when tension exceeds about 3.5 kg/cm², the sheet can snap. Recurring breakouts during rewinding can cut machine speed by 20–30%.
Look for: breaks at the same position, nicks at the edge, or dry, brittle zones.
Check: tensile strength (ISO 12625-4), moisture (typical 4–7%), and slitting quality.
Action: reduce and balance tension, confirm the sheet is not over-dried, and inspect knives for nicks that start a tear.
Holes range from tiny pinholes to visible openings and can cause breaks or reject finished product.
Causes: contamination or fibre bundles in the furnish, damaged felt or press rolls, and debris on the forming section.
Action: inspect and clean the wet end, check felt condition, and screen the furnish for contaminants.
Wrinkles usually come from uneven web tension or roller misalignment rather than a weak sheet.
Causes: tension that varies across the width, misaligned rollers, or a web that needs spreading.
Action: align the roller train and install or adjust a bow (spreader) roller, which flattens the web and removes wrinkles; then rebalance the tension profile.
Excess dust deposits on blades, sensors and finished rolls, and signals fibre detaching from the surface.
Causes: over-drying, dull or incorrectly set creping/doctor blades, or weak fibre bonding.
Action: sharpen and set blades correctly, verify moisture and refining levels, and use local dust extraction.
A crushed or oval core prevents the reel from seating on the unwind shaft.
Causes: rough handling, excessive winding pressure, or an under-spec core.
Action: improve handling and clamping, reduce winding pressure, and use a robust 76 mm (3 in) core.
Ragged, partial or uneven cuts create weak edges that tear during converting.
Causes: dull or misaligned slitting knives and incorrect blade pressure.
Action: replace or re-sharpen knives, reset pressure, and verify alignment before the run.
Catching a problem before it reaches the line avoids downtime and waste.
Verify grammage (ISO 12625-6) and its tolerance, typically ±3% for a full container and ±5% for a single sample.
Check moisture (4–7%) and look for baggy or tight zones.
Inspect edges and the core for damage, and confirm the reel is not oval or crushed.
Review the mill's test report for dry and wet tensile (ISO 12625-4/5).
Run a short trial unwind to reveal wrinkles, dust or slitting issues early.
HUAXIN reels are tested against the ISO 12625 series, including Parts 3, 4, 5, 6, 7 and 8, plus ISO 287 (moisture) and ISO 6588-1 (pH). Production covers width 200–2850 mm, GSM 11–42 g/m², diameter up to 1150 mm and a 76 mm (3 in) core. A full container holds about 26 reels / 12–13 tons, with each reel around 500 kg.
What causes tissue parent rolls to break during converting? Breaks usually result from excessive tension, weak or dry spots, or a nick from slitting. On light 13–18 g/m² tissue, tension above about 3.5 kg/cm² can snap the web. Check tensile strength, moisture and knife edges, then balance the tension.
How do you remove wrinkles from a tissue web? Wrinkles are typically caused by uneven tension or misaligned rollers. Align the roller train, rebalance tension across the width, and use a bow (spreader) roller to flatten the web.
Why is there dust on my tissue converting line? Dust and lint usually come from over-drying, dull creping or doctor blades, or weak fibre bonding. Sharpen and set the blades, confirm moisture and refining, and add dust extraction.
What is a crushed core and how is it prevented? A crushed core is a deformed cardboard tube that stops the reel mounting correctly. It is prevented by careful handling, lower winding pressure and a stronger 76 mm (3 in) core.
