Technical Guides
Splice Tension Control on Corrugator: Preventing Breaks and Quality Issues
Control flying-splice tension windows with dancer and load-cell feedback to cut breaks, edge wrinkles, and weak overlaps on 150–300 m/min corrugators.
Flying-splice tension control protects uptime and board quality at the same time. When the new reel joins, a short tension excursion can break the web, wrinkle the edge, or leave an overlap that fails in the single facer or double backer. Treat OEM ranges as plant baselines to verify, not universal law for every paper combination.
Define the Tension Window Before Speed
Document target tension for liner and medium separately, then record the allowable band during steady run, accel, and the splice event. Many plants review OEM guidance in the range of roughly 150–400 N depending on web width, basis weight, and roll condition, then confirm with trials. Do not copy another plant's setpoints without paper and width context.
Use Dancer and Load-Cell Feedback Together
A dancer shows storage and response lag; a load cell shows instantaneous web force. Calibrate both on a planned interval and verify zero and span after roll changes or sensor work. If the dancer oscillates while the load cell spikes above the band for more than 0.5–1.0 s, investigate actuator response, air pressure, and brake gain before raising speed.
Separate Liner and Medium Strategies
Liners often run under higher absolute tension and different brake characteristics than medium. Medium webs can wrinkle at the edge when tension is high relative to stiffness, while light liners may break when accel is aggressive. Keep separate recipe cards for each common paper family and width rather than one global tension number.
Control Accel and Decel Through the Splice
Plan the splice window inside a controlled speed band instead of during an uncontrolled ramp. On a line operating between 150 and 300 m/min, many teams hold within ±10–15 m/min of the selected splice speed for several seconds before and after the cut. Sudden brake release or aggressive take-up after the join is a frequent cause of breaks.
Watch Edge Wrinkle as an Early Warning
Edge wrinkles appearing within 20–50 m after the splice often indicate uneven nip, misaligned splice heads, or tension too high on one side of the web. Mark left and right evidence on the reject sample. Correct geometry and cross-machine tension balance before compensating with higher overall tension.
Protect Overlap Quality
Define minimum and maximum overlap length for the splicer model and tape or glue system in use. An overlap that is too short can open under heat and moisture; one that is too long can create a hard spot that damages rolls or causes a downstream break. Measure overlap on the first 3–5 successful splices after setup and after any head adjustment.
Trend Breaks by Cause Code
Classify each break as tension spike, poor overlap, bad reel edge, core collapse, splice timing, or unknown. Review weekly counts against speed and paper grade. If tension-related breaks exceed about 30% of total breaks on a shift pattern, prioritize sensor calibration and accel profiles before blaming paper alone.
Validate at Progressive Speeds
Commission or revalidate at 150, 200, 250, and 300 m/min where the line and converting can support those speeds. Hold paper combination constant while changing one major variable. Record splice success rate, break count per 10,000 m, overlap length, and edge wrinkle incidence at each step.
Link Splicer Setup to Break Analysis
Use splicer-machine-corrugating-line-guide for head timing, tape path, and prep standards, and corrugator-paper-break-causes-solutions for post-break investigation. Tension control is only one branch of the break tree; reel quality and splice preparation still matter.
Coordinate Heating and Adhesive After a Disturbed Splice
A rough splice can disturb moisture and bond for a short board length even when the web does not break. Inspect the next stacks for weak bond or warp, especially on lines with tighter heat profiles. Light coordination with adhesive and heating practice helps, including configurations discussed for /products/boiler-free-line where dwell and temperature windows are managed without steam.
Close the Loop with Soft Equipment Support
Xuegong New Materials Group can help plants document splice tension baselines, sensor checks, and speed-step trials on supported corrugating equipment. Final setpoints must be approved from OEM limits, local paper supply, and measured plant results—not from generic promises of zero breaks.
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