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In rotary die cutting, accuracy, repeatability, and production efficiency depend heavily on one key component: the magnetic cylinder. Whether you are die cutting labels, flexible packaging, films, paper, or foil, choosing the right magnetic cylinder ensures stable cutting performance and long die life.
This guide explains how to select the right magnetic cylinder for rotary die cutting, covering specifications, tolerances, materials, and application-based recommendations.
A magnetic cylinder is a precision-machined steel roller with permanent magnets embedded inside. It holds the flexible die securely on the surface during high-speed rotary die cutting.
The magnetic cylinder provides:
Stable die fixation
Accurate repeat length
Consistent cutting pressure
Smooth rotation at high speeds
Any deviation in precision directly affects cutting accuracy and waste levels.
Choosing the wrong magnetic cylinder can lead to:
Poor cutting accuracy
Uneven pressure across the web
Short flexible die lifespan
Material waste and downtime
A high-quality magnetic cylinder ensures:
Clean and consistent cuts
Stable die positioning
Long-term dimensional accuracy
Repeat length is one of the most critical parameters.
Standard tolerance should be ±0.01 mm or better
Poor repeat accuracy causes misaligned cuts and registration issues
Always verify:
Repeat measurement reports
Machining precision
Magnetic force must be strong and evenly distributed.
Insufficient magnetism → Die lifting or shifting
Uneven magnetism → Inconsistent cutting depth
Ask suppliers about:
Magnetic field uniformity
Long-term magnet stability
The surface directly contacts the flexible die.
Look for:
Precision-ground surface
Uniform hardness
Scratch and wear resistance
A poor surface finish can damage the die and reduce cutting accuracy.
Dimensions must match your die cutting machine.
Confirm:
Outer diameter
Face width
Shaft size and bearing positions
Even small dimensional errors can affect cutting performance.
Low TIR ensures smooth rotation.
Lower TIR = better cutting stability
Especially important for high-speed label and packaging lines
Faster delivery
Lower cost
Suitable for common die sizes
Custom repeat lengths
Special diameters or widths
OEM replacement requirements
Custom solutions are ideal for unique applications or machine upgrades.
High repeat accuracy
Strong magnetic force
Low TIR for high-speed operation
Wider face widths
High rigidity
Stable magnetic field across the full width
Durable surface finish
Balanced magnetic force to protect dies
Choosing based on price only
Ignoring magnetic strength consistency
Not checking compatibility with flexible dies
Skipping inspection and measurement reports
These mistakes often lead to poor cutting results and higher operating costs.
Good maintenance extends cylinder life and cutting accuracy.
Best practices:
Clean after each job
Avoid impact and scratches
Store in protective racks
Keep away from strong external magnetic fields
Properly maintained magnetic cylinders can last many years.
A reliable manufacturer offers:
Precision machining
Stable magnetic materials
Quality inspection reports
OEM compatibility
Long-term technical support
This ensures consistency and reliability for repeat orders.
JCTPRINT supplies high-precision magnetic cylinders for rotary die cutting.
Our advantages:
Tight machining tolerances
Stable and uniform magnetic force
Custom and standard solutions
Compatibility with major die cutting machines
Experience serving global markets
Our magnetic cylinders are designed to deliver clean cuts, long die life, and stable production.
Send us:
Machine model
Required repeat length
Face width
Application type
Our team will recommend the right magnetic cylinder and provide a competitive quotation.
Contact JCTPRINT today for professional magnetic cylinder solutions.
