TWO LOOPS ON ONE FRAME
When a lane wanders by half a millimetre, the bag maker sees a register error or a seal that misses its overlap. When tension drifts, the roll either takes a set or telescopes on the shelf. Both faults are born at the slitter and both arrive as somebody else's complaint. That is why the number worth arguing about on a slitter rewinder machine is not the top speed on the plate but the sensor, the thruster and the tension range behind it.THE LANE: WHAT 0.30 MM ACTUALLY MEANS
On the CLFQ-W1100 the correction figure is ≤ 0.30 mm, read by a U-shaped ultrasonic sensing system running along a 30 mm guide rail. Ultrasonic sensing does not care about the colour of the web or the gloss of a metallised surface, which is why the same setting holds on aluminium foil and on printed film within one shift. That figure describes how well the machine can see and correct. It says nothing about how straight the parent roll is, and a jumbo with a soft edge will still push the lane out; the loop simply brings it back faster. Narrow lanes make the same figure harder to live with. A 0.30 mm error stays 0.30 mm whether the lane is 1100 mm wide or 30 mm wide. On the narrowest lanes the machine can produce, it is also the largest error relative to lane width. Film and foil work at 30 mm slit width therefore asks for the sensor and the thruster together, never one without the other.PHOTOELECTRIC AND ULTRASONIC ARE NOT INTERCHANGEABLE
The 1300 Type uses photoelectric edge correction with 120 mm of travel and ± 0.5 mm error. On non-woven and roll paper that is the right tool. The material is opaque, the parent roll edge is rarely straight, and 120 mm of stroke lets the machine follow it. Point the same sensor at clear film and it has nothing to read. Stroke is the other number worth reading, because it states how far out of line a parent roll can sit and still be corrected. A machine with 30 mm of travel expects a straighter jumbo than one with 120 mm, and that expectation belongs in the purchase conversation rather than in the first week of production. Machine choice therefore starts with the material and the quality of the parent roll, not with the width on the order.WHAT THE THRUSTER DOES WHEN THE EDGE WOBBLES
Correction is only as good as the mechanism that moves the web. The CLFQ-W1100 uses an analogue-driven correction thruster, and the reason is hunting. A digital on-off thruster corrects in steps: it sees an error, it moves, it overshoots, it comes back. On a narrow lane at 400 m/min that oscillation prints itself into the edge as a wave. An analogue drive moves in proportion to the error, so the lane settles instead of ringing. Guide and dancer practice is where that behaviour is usually learned the hard way.TENSION IS CALCULATED FROM DIAMETER, NOT SET ONCE
Both machines recalculate roll diameter continuously and derive tension from it, rather than holding a fixed torque. The reason is arithmetic. The same torque produces a different tension as the roll builds, so a setting that is correct at 200 mm diameter is far too much at 1100 mm. On the CLFQ-W1100 the working range is 2 to 30 kg, with a 200 N·m magnetic powder brake at the unwind and two 7.5 kW winding motors. The controller does the diameter maths and leaves the operator with a figure in kilograms, which is a unit a shift can reason about. Magnetic powder was chosen on these machines for a second reason: it releases without residual torque when the drive stops, so a roll does not keep tightening while the line sits idle. Tension distribution across the web is the part a single setpoint never describes.TWO ZONES: BRAKE AT THE UNWIND, CLUTCH AT THE REWIND
The 1300 Type separates the two ends. A 200 N·m magnetic powder brake holds the unwind and a 200 N·m clutch drives the rewind, each set on its own. That is what allows a converter to run a heavy parent roll under brake while the lane is wound to a different tension. One zone cannot do both jobs, and a machine with a single tension setting has to compromise between holding the jumbo and building a stable roll. Rewinder tension practice on non-woven follows the same logic.THE ROLL THAT TELESCOPES AND THE CURVE THAT CAUSES IT
Telescoping, where the inner laps slide out and the roll reads like a stepped cone, has two causes worth checking first: wound too soft, or a taper curve too aggressive at the core. Both live in the first hundred metres. Set initial tension high enough to grip the core, then let the taper fall away as diameter builds. A curve that starts soft cannot be rescued further up the roll, which is why the first roll off a new setup is the only one that tells you anything. Two rolls are worth keeping from every setup: the first, and the one after a material change. Compare their end faces at the core rather than at the outside, because the outer laps are wound under low tension and will hide the fault you are looking for.THE EDGE THAT BURRS AND THE OVERLAP THAT CAUSES IT
Burrs and dust on the cut edge point at knife overlap for the gauge, and at side load on the blade. The 1300 Type carries ten circular knives on a chain-driven channel-steel frame, which keeps the bank stiff on heavy stock. Razor slitting on the CLFQ-W1100 suits thin film and foil. Neither setup forgives an overlap set for a different thickness, and the symptom usually appears as dust in the lane rather than as a visible cut. Roller condition belongs in the same inspection, because a scored roller marks an edge that the knife cut cleanly.THE NUMBERS THAT BOUND THE TWO LOOPS
CLFQ-W1100: 400 m/min mechanical and 350 m/min in cut, web 100 to 1100 mm, slit width 30 to 1100 mm. Unwind Φ1400 mm, rewind Φ1100 mm, 3 inch cores at Φ76 mm inside and Φ92 mm outside. Total power 23 kW, 4000 kg on a 3500 × 3200 × 1900 mm frame. 1300 Type: 200 m/min mechanical and 150 m/min cutting, fixed widths of 45, 60, 65 or 90 cm, unwind Φ1500 mm and rewind Φ400 mm on 3 inch air shafts, 5.5 kW, 1200 kg. Read both lists as the envelope a slitter rewinder machine has to work inside, not as a ranking. Both machines sit in the XIAOPAI flexible packaging range, one built for narrow lanes at speed and one for fixed widths on heavy stock. XIAOPAI lists both under slitting and rewinding rather than as two separate product lines, because the buyer's question is the same one either way.MATERIAL TELLS YOU WHICH LOOP IS HARDER
Kraft paper from 30 to 300 g/m², white board, coated paper, aluminium foil, PVC and tin foil run on the CLFQ-W1100. Non-woven, aluminium foil, plastic film and roll paper run on the 1300 Type. Thin foil punishes the guiding loop, because a third of a millimetre of lane error is visible in a finished laminate. Heavy non-woven punishes the tension loop, because a roll wound hard takes a set that nothing downstream can flatten. That split explains why one plant can justify both machines. A converter running 30 mm lanes on 12 micron foil and 900 mm lanes on 200 g/m² kraft is asking two loops to be good at two different things, and no single setting does both. Web-handling design work on these machines usually starts from that split rather than from the speed figure.WHAT TO ASK, AND WHAT XIAOPAI SUPPLIES
Five questions, all answerable from a specification sheet. Which sensor reads the edge, and to what accuracy. What moves the web, analogue or on-off. How tension is calculated, and over what range in kilograms. Whether the two ends can be set independently. What the knife set is, and whether it arrives as a bank or as loose blades. Wenzhou Xiaopai Electric Power Technology Co., Ltd. works with SINSTAR, which builds the range, and supplies both machines as an authorized distributor. XIAOPAI keeps the interface in Wenzhou: configuration against the material and the lane pattern, inspection before shipment, commissioning on site. XIAOPAI also carries the knife sets and the wear parts that hold the two loops inside their tolerances over a working life. In a flexible packaging line the slitter sits downstream of the blown film extruder and the CI flexo press, which is where the web arrives with whatever tension history those two stages gave it. The published page for the 1300 horizontal slitting machine carries the figures listed above.ONE LINE FOR THE RECORD:
A slitter rewinder machine is judged on two closed loops, lane position and web tension, and both are hardware questions before they are speed questions.
A slitter rewinder machine is judged on two closed loops, lane position and web tension, and both are hardware questions before they are speed questions.
