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1. What is a core cutter?
A core cutter is a machine designed for the precise cutting of paper cores (tubes) into sections of a specified length. Paper cores are used as winding shafts in rewinding, slitting, and roll converting processes.
Core cutters are widely used in industries processing:
•    packaging films
•    paper
•    laminates
•    self-adhesive labels
•    technical tapes
•    non-woven materials
•    aluminum foil
In English, a core cutter is commonly referred to as a core cutter or paper core cutting machine.

2. What is a core cutter used for?
A core cutter is used to prepare paper cores of the required length for production processes involving roll materials.
The use of a core cutter offers several advantages:
•    fast preparation of large quantities of cores
•    high cutting length repeatability
•    reduced material waste
•    increased production efficiency
•    improved operator safety compared to manual cutting methods
Precisely cut cores have a direct impact on the quality of winding and rewinding processes.

3. What types of cores can be cut on a core cutter?
Modern core cutters can process a wide range of paper tubes and cores, including:
•    spiral-wound paper cores
•    parallel-wound paper cores
•    cardboard tubes
•    cores for films and laminates
•    cores for paper rolls
•    cores for technical tapes and label materials
The range of diameters, lengths, and wall thicknesses depends on the machine design and the specific application requirements.

4. How does a core cutter work?
The process begins by placing the paper core into the cutting area. The core is then positioned according to the required cutting length, after which the machine performs an automatic or semi-automatic cut.
Modern core cutters are often equipped with:
•    electronic length positioning
•    automatic core feeding systems
•    measuring systems
•    operator panel settings for cut length and quantity
•    automatic collection of finished core sections
These features ensure high cutting accuracy and excellent production efficiency.

5. How do I choose the right core cutter?
The selection of a core cutter should be based on the specifications of the paper cores being used and the required production output.
Before purchasing a machine, the following parameters should be defined:
•    core inside diameters
•    wall thickness
•    maximum incoming core length
•    required cut lengths
•    daily cutting volume
•    desired level of automation
At Jurmet, core cutters are selected individually according to each customer's requirements. The Jurmet portfolio includes manual, semi-automatic, and fully automatic core cutters equipped with automatic core feeding systems.
By choosing the optimal machine configuration, customers can achieve high productivity, consistent cutting quality, and safe, ergonomic operation.

1. What is a rewinder?
A rewinder is a machine designed to rewind roll materials from one roll to another. The rewinding process can improve roll quality, trim uneven or telescoped edges, inspect the material, remove defective sections, change the roll diameter or prepare the material for subsequent production processes.
In some applications, additional processes can be integrated into the rewinder, such as InkJet printing stations, marking systems, inspection equipment, or other converting operations.
Rewinders are used to process roll materials such as films, paper, laminates, aluminum foil, nonwovens, and various technical materials.

2. What is a rewinder used for?
A rewinder is used to transfer material from an incoming roll onto a new roll while maintaining proper web tension and rewind quality.
The rewinding process is commonly used for:
•    improving rewind quality
•    removing damaged sections of material
•    inspecting web quality
•    changing roll diameter
•    trimming roll edges
•    preparing material for printing, laminating, or further converting processes
•    adding an additional processing step
•    converting finished products into customer-required formats
In many production facilities, a rewinder also serves as a final quality control station before the product is shipped to the customer Doctor rewinder.

3. What materials can be processed on a rewinder?
Modern rewinders can handle a wide range of roll materials, including:
•    PE, PP, PET, and BOPP films
•    barrier films
•    multi-layer laminates
•    paper and paperboard
•    aluminum foil
•    self-adhesive label stock
•    non-woven materials
•    technical and specialty materials
Selecting the right rewinder depends on material characteristics such as thickness, width, elongation properties, and web tension requirements.

Another type of material are wrap-around labels, which are converted on narrow or mid-web slitter-rewinders usually equipped with a print inspection system. This application requires slitting onto multiple rolls just like in a regular wide slitter.

4. How does a rewinder work?
The process begins by loading the master roll onto the unwind stand. The material then passes through web guiding and tension control systems before being rewound onto a new core. Modern rewinders are often equipped with:
•    automatic web guiding systems
•    electronic tension control
•    quality inspection systems
•    length measurement counters
•    defect marking systems
•    automatic finished roll unloading systems
•    bidirectional operation capability
These features make it possible to produce perfectly wound rolls while identifying potential defects before the material enters subsequent production stages.

5. How do I choose the right rewinder?
The selection of a rewinder should be based on the requirements of the converting process and the characteristics of the material being processed.
The most important selection criteria include:
•    material type
•    working width
•    maximum unwind and rewind diameters
•    rewinding speed
•    required level of quality control
•    desired level of automation
At Jurmet, every rewinder is individually engineered to meet the specific requirements of each application. This ensures excellent rewind quality, stable process performance, and safe handling of even the most demanding materials. 

Machine selection should not start only with technical parameters.
It should start with the material type and its structure (material mix).

It is the material properties that determine:
• web tension requirements,
• material handling / web guiding method,
• cutting technology,
• and consequently the construction and configuration of the slitter rewinder.

From my experience, most production issues such as wrinkling, uneven winding, or poor cutting quality do not result from a 'bad machine', but from a mismatch between the machine and the material / process.

Why does material matter?

During rewinding and slitting, the material behaves dynamically. It reacts to:
• tension changes,
• operating speed,
• friction,
• contact with machine components.

Each material has its own specific operating characteristics.
Key differences:

Film (PE, BOPP, PET):
• very sensitive to tension changes,
• prone to stretching and deformation,
• requires stable web handling.

Paper:
• more mechanically stable,
• less sensitive to tension,
• but prone to edge damage.

Laminates:
• more demanding,
• combine properties of different materials,
• often behave unpredictably when parameters change.

Aluminium:
• highly demanding technologically,
• prone to mechanical damage,
• sensitive to tension and process settings.

In practice, this means one thing:
the same machine can produce completely different results depending on the material.

The most common mistake: the 'universal slitter-rewinder'.

Many customers look for a solution that 'handles everything'.
This is understandable from a business perspective, but very risky technologically.

A universal machine:
• is rarely optimal for a specific material,
• requires compromises,
• increases the risk of quality issues.

In practice this means:
• more adjustments,
• higher operator dependency,
• lower process repeatability.

A well-selected slitter rewinder is not one that 'does everything'.
It is one that performs a specific task with high and repeatable quality for years.

Key parameters in slitter-rewinder selection

Below are elements that truly matter in daily production.

1. Web tension range and stability

One of the most important parameters, especially for film, laminates, and aluminium.

Key aspects:
• wide tension adjustment range,
• tension stability during roll diameter changes,
• precision of the control system.

Too high tension:
• causes material stretching,
• leads to deformation,
• in extreme cases – web breakage.

Too low tension:
• results in unstable winding,
• causes wrinkling.

The key is 'not only whether tension control exists', but how precise and stable it is.

In practice, different solutions are used: dancer rolls, load cells, taper tension systems, or properly selected drives designed to ensure stable conditions for a specific material.

2. Web guiding system

Even the best tension control is not enough if the material is not guided properly.

A good web guiding system:
• keeps the web centered,
• compensates deviations,
• ensures process repeatability.

Problems caused by poor guiding:
• material shifts,
• uneven slitting,
• increased blade wear.

This is one of the most underestimated machine components.

3. Slitting technology and knife setup

Cut quality directly affects final product quality.

Key elements:
• knife type selection (rotary, razor),
• type of engagement,
• adjustment method,
• position repeatability.

Different materials require different approaches:
• film → precision and minimal deformation,
• paper → clean edges,
• laminates → compromise,
• aluminium → perfect edge without deformation.

In practice:
the knife setting system is just as important as the knife type itself.

4. Level of automation

Automation should be matched to:
• production scale,
• job repeatability,
• team competence.

Benefits:
• shorter changeovers,
• fewer errors,
• higher repeatability,
• reduced waste.

But note:
automation without process standardization does not solve problems – it only masks them.

5. Machine structural stability

Often overlooked – but critical.

Structural rigidity:
• improves web handling,
• reduces vibration,
• increases repeatability,
• reduces failures,
• lowers maintenance costs.

Two machines with similar parameters can behave completely differently due to this factor.

6. Operating costs and energy efficiency

An increasingly important factor in machine selection.

Key aspects:
• energy recovery,
• waste level,
• service costs,
• reliability.

A well-designed machine does not only produce – it minimizes costs over years of operation.

How should the machine selection process look?

The best projects start with process analysis.

Step 1: Material
• type,
• thickness,
• properties.

Step 2: Process
• speeds,
• quality requirements,
• tolerances.

Step 3: Technology
• tension,
• guiding,
• slitting.

Step 4: Automation

Only at the end:
machine selection.

What happens when a machine is incorrectly selected?

Results:

• unstable production,
• quality issues,
• high number of adjustments,
• operator dependency.

Business effects:

• material losses,
• complaints,
• downtime,
• team frustration.

Important:
these problems are often attributed to the material, but they primarily result from machine-process mismatch.

Summary

Slitter rewinder selection is a technological decision, not just an investment one.

Key conclusions:
• material is the starting point,
• 'universal solutions' rarely work,
• key factors are: tension, guiding, slitting, and stability,
• a well-selected machine improves quality and production predictability.

The best results are achieved when the machine is adapted to the process – not the other way around.

Katarzyna Rose
Jurmet
Sales Manager

1. What is a slitter rewinder?
A slitter rewinder is a machine designed for the longitudinal slitting and rewinding of roll materials such as plastic films, paper, laminates, aluminum foil, and various technical materials.
The purpose of a slitter rewinder is to convert a wide master roll into multiple narrower rolls of specified widths and rewind them into finished rolls ready for further processing or delivery.
Slitter rewinders are widely used in the flexible packaging, paper converting, label converting, pharmaceutical, and technical materials industries.

2. What is a slitter rewinder used for?
A slitter rewinder is used for the precise slitting and rewinding of roll materials.
For unprinted materials, the machine prepares the material in the format required for subsequent production processes such as printing, coating, or laminating.
For packaging production, slitting is often one of the final manufacturing processes. In this case, precise slitting is particularly important because the slitter rewinder processes material that has already undergone other costly operations, including printing and laminating. Any slitting defects at this stage can result in significant material losses and reduced product quality.
Modern slitter rewinders offer:
•    simultaneous slitting into multiple rolls
•    automatic web tension control
•    fast job changeovers
•    reduced material waste
•    improved rewind quality

3. What materials can be processed on a slitter rewinder?
The range of processable materials depends on the machine design and configuration. Professional slitter rewinders can typically process:
•    PE, PP, PET, and BOPP films
•    multi-layer laminates
•    paper
•    aluminum foil
•    self-adhesive label stock
•    technical and specialty materials
When selecting a slitter rewinder, material properties such as thickness, elongation characteristics, coefficient of friction, and tension requirements play a critical role.

4. How does a slitter rewinder work?
The slitting process begins with loading a master roll onto the unwind stand. The material then passes through the web guiding system, the slitting section, and finally the rewind section, where finished rolls are produced.
In modern slitter rewinders, the process is supported by:
•    automatic web guiding systems
•    electronic tension control
•    automatic knife positioning systems
•    production parameter monitoring
•    advanced automation technologies
•    finished roll unloading systems
These technologies ensure excellent rewind quality and stable production performance, even at high operating speeds.

5. How do I choose the right slitter rewinder?
Selecting the right slitter rewinder should be based primarily on the type of material being processed and the production requirements. Before purchasing a machine, the following parameters should be defined:
•    material type (film, paper, laminate, aluminum foil, etc.)
•    master roll width
•    maximum unwind and rewind diameters
•    required production speed
•    minimum slit width
•    desired level of automation
At Jurmet, every slitter rewinder is individually configured according to the customer's application requirements. This approach ensures a stable production process, superior slitting quality, maximum productivity, and minimized material waste.