How Does an Automatic Die Cutting Machine Cut Reels?

A Automatic Die Cutting Machine in the reel-fed configuration cuts reels by unwinding the paper web, feeding it through a servo-controlled registration system, and pressing it against a die under up to 300 tons of pressure—without stopping for sheet loading. The FD series from Longge runs this process at 110–200 cuts per minute with ±0.15mm precision on paper from 120 to 600 gsm. This article explains how the servo and photoelectric system hold registration, what the QT500-7 frame contributes to cut quality at speed, and what to verify when you're matching a reel-fed die-cutter to a continuous packaging line.

How Does the Servo System Hold Registration on a Moving Web?

Printed Graphics vs. Fixed-Length Cutting

The FD series uses a servo motor and photoelectric sensor combination to align the die with the printed graphics on the web. For printed products, the sensor reads the register mark and the servo corrects the feed length in real time, so the cut lands in the same position relative to the print on every cycle.

For unprinted products, the system switches to fixed-length cutting via microcomputer-controlled feed lengths. That dual mode—registration tracking for printed work, fixed-length for blank stock—means the same machine covers both printed and unprinted production without a mechanical changeover.

Precision Across the Speed Range

The cutting precision is ±0.15mm on the H-series models and ±0.20mm on the ML-series models. That tolerance holds across the speed range, from the low end used for heavy board to the top end used for thinner paper. The servo response and the frame rigidity together determine whether the precision stays inside that window as the speed changes.

What Does the QT500-7 Frame Contribute at 300 Tons?

The frame is the first thing that determines whether a die-cutter can hold precision under pressure. The FD series uses QT500-7 ductile iron for the main structure, with a high-precision worm gear drive. That material and drive combination provides stable, high-pressure cutting at high speed with low noise and enhanced durability.

A frame that flexes under 300 tons allows the die to shift, and the cut precision drifts with it. The QT500-7 casting holds the die and the platen in fixed relationship, so the ±0.15mm tolerance stays consistent from the first cut to the last. The 7.5kW inverter motor paired with an oversized flywheel delivers the die-cutting force smoothly, with stepless speed regulation and energy efficiency.

What Keeps the Machine Running Through a Long Shift?

Forced Lubrication and Hydraulic Protection

The drive mechanism uses a forced lubrication system that delivers oil to the worm gear and the main bearings under pressure. That continuous lubrication reduces wear and keeps the drive temperature stable through a long production run. A hydraulic shutdown protection and filtration monitoring system add a second layer of protection: if the oil pressure drops or the filter clogs, the machine stops before the drive is damaged.

Pneumatic Clutch-Brake and Electronic Pressure Control

The pneumatic clutch-brake system provides precise torque control with low noise and high efficiency, plus automatic overload shutdown for safer operation. The electric pressure control system allows one-touch die-cutting pressure adjustment via the HMI, so the operator can change the pressure for a new job without manually adjusting a mechanical linkage. That rapid response and precise control make the setup faster and more repeatable.

Where Does Reel-Fed Die-Cutting Fit in Production?

A Automatic Die Cutting Machine in the reel-fed format is used in printing, packaging, and paper products where the input is a continuous roll rather than a stack of sheets. That covers folding cartons, paper cups, paper plates, and labels—the products that are converted from a printed or blank reel into a die-cut shape before forming or filling.

The FD series from Longge is built for mid-to-high-end production, with the ML970 and H970 platforms covering cutting areas from 940×510mm to 1160×600mm and production speeds from 110 to 200 cuts per minute. The PLC and HMI integration provides automatic monitoring, fault alarms, and automatic shutdown protection, so the machine can run through a shift with minimal operator intervention.

What Should You Check Before Selecting a Reel-Fed Die-Cutter?

How do I match the cutting area to my blank?

The FD series covers cutting areas from 940×510mm to 1160×600mm depending on the model. Match the area to your largest blank layout plus the gripper and register margin. A blank that approaches the upper limit of a model's range leaves no margin for the register mark or the die frame.

What paper weight and speed do I need?

The paper range is 120–600 gsm on the ML-series and 120–400 gsm on some H-series models. The production capacity ranges from 110 to 200 cuts per minute. Plan the speed against the paper weight and the die complexity, not the headline maximum. Heavier board may run at the lower end of the range to maintain the ±0.15mm precision.

What maintenance does the forced lubrication system need?

Check the oil pressure and the filter condition during scheduled maintenance. The filtration monitoring system alerts the operator when the filter needs replacement, but the oil level and the pump performance should still be inspected. Verify the hydraulic shutdown protection by simulating a low-pressure condition, and confirm that the pneumatic clutch-brake engages and releases smoothly.

Straight Answers on Reel-Fed Die-Cutting

What's the difference between reel-fed and sheet-fed die-cutting?

A reel-fed machine takes a continuous roll and cuts it without stopping for sheet loading. A sheet-fed machine requires the sheets to be pre-cut and loaded into a feeder. The reel-fed format eliminates the separate sheeting step and the sheet loading labor, which makes it suitable for high-volume continuous production.

Can the machine cut unprinted stock?

Yes. The FD series supports both registration-based cutting for printed graphics and fixed-length cutting for unprinted products. The operator selects the mode through the microcomputer-controlled feed length, without changing the mechanical setup.

What causes registration to drift on a reel-fed machine?

Registration drift usually comes from web tension variation, a worn servo coupling, or a misaligned photoelectric sensor. The servo and sensor combination on the FD series corrects for tension variation in real time, but the sensor lens should be kept clean and the coupling should be inspected for wear. If drift persists, check the web guide and the unwind tension before adjusting the servo parameters.

What is the maximum cutting pressure?

The ML970 and H970 models with the larger cutting areas carry a 300T maximum cutting pressure. The H970 with the smaller cutting area carries 180T. Match the pressure rating to the die design and the board thickness. A die with a large solid area requires more pressure than a die with a simple outline.

Let's Match a Reel-Fed Die-Cutter to Your Line

Share Your Blank Size, Paper Weight, and Print Requirement

An Automatic Die Cutting Machine in the reel-fed format should match your cutting area, paper weight, and whether the job is printed or unprinted—not the other way around. The FD Series Fully Automatic Reel-Fed Die-Cutting Machine from Longge runs at 110–200 cuts/min with ±0.15mm precision, handles 120–600 gsm paper across 940×510mm to 1160×600mm cutting areas, and uses servo registration for printed graphics or fixed-length cutting for blank stock. The QT500-7 frame, forced lubrication, and electronic pressure control support continuous production with minimal downtime. If you're specifying a reel-fed die-cutter for folding cartons, cups, plates, or labels, send us your blank size, paper weight, and print requirement — we'll help you confirm the right model before you order.