Banana rollers - an effective solution in eliminating material wrinkles in the production process
Product catalog
Technical characteristics
Parameter | Value / Range |
Type | Banana roller (expandable, curved) |
Function | Tensioning and straightening material in motion |
Working length | 300mm-5000mm |
Diameter | Selectable depending on the application 75mm-150mm |
Shape | Curved (banana) |
Active surface | Can be covered with elastomer or steel |
Bearing system | Precision bearings |
Assembly | Face mounts / mounting sleeves |
Core material | Steel/aluminum (depending on requirements) |
Custom options | Possibility to make to order according to customer's drawing |
Benefits of using our solutions
Effective elimination of wrinkles and folds When working with flexible materials (films, nonwovens, paper, textiles).
Stabilization of the material track - The expansion shaft maintains uniform tension during the transport process.
Increase the quality of the final product - No creases, wrinkles or fabric shifts.
Adaptable to working conditions - length, diameter, bending angle, coating, type of bearings and fastenings tailored to the customer's machine.
Do you want to eliminate material wrinkling in the film or fabric manufacturing process?
What industries do we help ?
Banana rollers, also known as expansion rollers, are used wherever there is a problem wrinkling of the fabric as it moves. Their curved shape subtly stretches and tightens the transported medium across its width. They are most commonly used in:
● film production and rewinding lines (LDPE, HDPE, PET, BOPP),
● coating and laminating machines,
● label and flexible packaging production.
● flexographic and offset printers,
● processes for processing films, textiles, nonwovens and paper,
What you gain by choosing our banana rollers
They increase production efficiency and reduce downtime.
Reduce the risk of production waste due to improper belt routing.
Produced individually to order - tailored to a specific process.
Ability to integrate with existing process lines.
Not sure what type of expansion shaft will be best?
Opinions of Our Customers
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Q&A- frequently asked questions about banana rollers
What is a banana roller and what is it used for?
Banana roller (a.k.a. Curved Expansion Shaft) is a specialized component used in production lines whose function is to Stretching, stabilization and elimination of wrinkling of web material (e.g. film, paper, textiles). Thanks to its characteristic curved shape, the roller stretches the material transversely, smoothing out any creases or folds.
In what industries are banana rollers used?
Banana rollers are primarily used in:
industry printer (flexographic printing, offset printing),
production films and laminates,
extrusion plastics,
ribbon transport paper, textiles and gum.
How does the banana roller work?
Thanks to the curved axis and the appropriate tension of the lining (rubber or PU), the roller gently spreads the material sideways as it rotates. The angle of spreading the material depends on the deflection of the roller and the way it is mounted - mainly the angle of attack relative to the web.
What are the main benefits of using banana rollers?
Elimination of wrinkles and folds In ribbon materials,
Quality improvement printing, lamination or cutting,
Reduce material losses and claim costs,
Increase process stability technological.
How do you choose the right banana roller for your application?
The selection depends on several parameters:
Width and type of material (film, paper, textiles, etc.),
Production line speeds,
Demanded material opening angle,
Operating conditions (temperature, presence of moisture/chemicals),
Preferred type of coating (rubber, polyurethane, other).
Consultation is always recommended - we prepare custom rollers, tailored to the specific application.
How to mount the banana shaft so that it works properly?
Proper alignment of the roller with respect to the track of the material is key -. the angle of attack should be 15-30°. Too small an angle may not give a stretching effect, too large an angle may distort the material. Also important is appropriate length of the roller - It is usually longer than the width of the material by 20-100 mm.
Can the degree of curvature of the banana roller be adjusted?
In advanced versions, yes - we offer models with adjustable deflection, which allow the user to adjust the curvature according to the current process parameters. This is useful in applications where material types or thicknesses change.
What are the differences between rubber and PU banana rollers?
Rubber is more flexible and gives a better fit to delicate materials.
Polyurethane (PU) is tougher and more resistant to abrasion - it performs well at higher speeds and in environments with chemicals.
The choice of coating material depends on the specific application - we are happy to advise on the best solution.
How long does a banana roller last?
Durability depends on the intensity of work, the type of material and the environment (dust, temperature, chemicals). Under standard conditions, rubber rollers can work for several years, while PU coatings last longer -. up to 5-7 years.
What are the standard diameters and lengths of banana rollers?
We manufacture banana rollers bespoke, tailored to the specific machine and application. The most commonly used core diameters are:
70 mm,
90 mm,
120 mm,
but we can also prepare rollers with other parameters according to customer needs.
What information is needed to prepare a bid for a banana roller?
To prepare a precise quotation, we need:
The length of the roller (or the width of the material),
core diameter,
The type of coating (if known),
Description of the application (type of material, line speed),
mounting preferences (type of mounting, angle of attack, installation location).
Do you help with the selection and design of banana rollers?
Yes - we provide Engineering support at the design stage, we help you choose the right design and cladding material. For regular customers, we also prepare installation drawings and service recommendations.
Still have questions?
Contact our department. We will respond within 24 hours
Banana rollers - an effective solution in eliminating material wrinkles in the production process
Banana rollers, also known as banana rollers or expansion rollers, are specialized components used in advanced manufacturing processes. Their main task is to eliminate wrinkles, stabilize the track of the material and improve the quality of the medium being rewound - most often film, paper, fabrics or nonwovens. Proper selection and installation of a banana shaft has a significant impact On the efficiency of the entire production process.
The principle of operation of the banana shaft
The banana shaft owes its name to its curved shape. In practice, its working principle is based on stretching the material transverse to the direction of travel. With proper deflection and installation at the correct angle of attack (the recommended banding angle is 15-30°), the material smooths out, and any creases and folds are eliminated. This is especially noticeable with thin film, where even small stresses can generate problems in further scrolling process or lamination.
Shaft construction and available technical parameters
Banana shafts are manufactured to size - working lengths can range from 300 mm to 5000 mm, and diameter The core is selected according to kind of material and process requirements (usually 70, 90 or 120 mm). There is also special executions possible - e.g., from independent drive, worm gear, pulley or air brake, which increases the application flexibility of the shaft.
The core of the shaft is usually made of steel or aluminum, providing high resistance and good mechanical properties, important in the context of dynamic loads and intensive operation. The active surface of the shaft can be covered with rubber or polyurethane - depending on the resistance to attrition and the characteristics of the medium being processed.
Application of banana shafts in production processes
Banana rollers are used in many production processes related to With ribbon materials. Typical applications include:
film processing: LDPE, HDPE, PET, BOPP, including extrusion, lamination, cutting, rewinding,
printing industry: offset and flexographic printing,
paper production and labels,
processing textiles, nonwovens and laminates.
These rollers can also be used as input guide roller, designed to properly arrange ribbon Before further operations.
Choosing the right banana shaft - what to pay attention to?
Shaft selection should be based on an analysis of several key variables:
kind of material As well as its width and thickness,
production line speed,
The required tensile force and banding angle,
working conditions - such as high temperature, chemicals, dust,
Installation preferences and available space.
At PROEXPORT, we help match the shaft to specific process parameters, also taking into account the requirements for structures, type of coating and method of attachment. We also offer spare parts and shafts with adjustable deflection - ideal for applications where it changes kind of Or the thickness of the material.
Benefits of using expansion shafts
By choosing to use a banana shaft, you gain:
significant increase in quality The final product - no folds or creases,
Lower risk of material losses and complaints,
unfolding And stabilizing the ribbon in the track,
Improving the efficiency and smoothness of the entire line,
Easier quality monitoring under changing conditions.