What is a keder? Keder insert, keder profile, keder rail, flat keder, and keder rod—simply explained.

A keder is one of those technical details that are barely noticeable in the finished advertising product—yet are crucial in determining whether a banner surface, textile print, light frame, or large-format graphic truly looks professional.

After all, flexible printing surfaces are not just about the design. It is also a matter of how the surface is attached, tensioned, guided, and—when necessary—replaced.

Or simply put:

A keder ensures that flexible print surfaces are securely fastened, tautly tensioned, and systematically interchangeable.

That sounds like a minor detail. In terms of impact, however, it often makes the difference between an improvised mounting and a professional signage solution.

At FOTOREKLAME, we do not view such details in isolation. We consider the keder, material, print, profile, finishing, and installation as an integrated system. Much of this work is carried out in-house—from printing and post-processing to precise finishing. Where specialized system materials or profiles are required, we handle the project planning, coordination, and installation using our own experienced specialists.

That is how a technical term becomes a working solution.

What is a keder?

A keder is a reinforced insert or edging along the edge of a flexible material. This insert is slid into a matching profile, keder rail, or frame system.

The principle is familiar from many areas: awnings, tarpaulins, tents, banners, textile tension frames, light boxes, truck curtains, or facade coverings.

In the signage industry, keder is primarily used when flexible materials—such as banners, tarpaulins, textile prints, mesh fabrics, display fabrics, or backlit textiles—need to be securely and neatly held within a system.

In short:

Keder + profile = a clean, tensioned, and interchangeable mounting system for flexible printed surfaces.

Why is a keder so important for professional signage and display technology?

No matter how good a printed banner looks, if it hangs unevenly, shows creases, or is attached in a way that looks visibly makeshift, the entire presentation loses its impact.

First impressions count, especially when it comes to high-quality branded surfaces, trade fair displays, light frames, POS systems, exhibitions, or container designs. A surface should appear calm, smooth, premium, and well-planned.

A keder system can help with exactly that.

The most important advantages are:

For companies, this means:

A keder solution transforms a flexible print into a professional, interchangeable communication surface.

Keder insert, keder profile, keder rail, and keder rod: What is the difference?

Terms such as keder, keder insert, keder profile, keder rail, keder rod, keder flap, flat keder, and silicone keder are often confused in everyday usage.

However, for project planning, it is helpful to clearly distinguish between them.

For not every keder solution suits every material. And not every term describes the same function.

What is a welt insert?

The keder insert is the reinforced section at the edge of the material. It can take the form of a round plastic insert, a flexible cord, a welded edge, a sewn-in insert, or a flat silicone lip.

For banners and tarpaulins, the keder insert is often incorporated into a hem pocket or fabricated as a keder flap. For textile tension frames and light boxes, a flat keder or silicone lip is frequently used, which is pressed into an aluminum profile.

The task remains similar:

The welt insert makes the edge of the flexible material rigid enough to be held within a profile.

Various types of piping, piping inserts, and piping thicknesses

Not all keders are the same. Depending on the application, material, and fastening system, different types and thicknesses of keder are used.

The diameter of the keder is particularly important. It must match the keder rail or profile. If the keder is too thin, it cannot hold the material securely enough. If it is too thick, it cannot be inserted smoothly, or the material fits too tightly within the profile.

Depending on the system and application, typical keder thicknesses range, for example, from approximately 4 mm to 14 mm. Smaller keders are frequently used for lighter textiles, displays, or specialized profile systems. Thicker keders are more commonly found in tarpaulins, banners, facade coverings, container surfaces, or more robust outdoor applications.

However, the exact strength is not a standard value that should be chosen arbitrarily. The decisive factor is always the combination of:

A keder is therefore always part of a system. The profile, material, and keder core must be compatible.

The strongest welt is not automatically the best one. The right welt is the best one.

What is a keder flag?

The keder flap is the flat section of material used to attach the actual keder to the banner, tarpaulin, or textile. It can be thought of as a transition zone between the printed surface and the round keder profile.

For tarpaulins and banners, the keder flap is frequently welded or sewn on. The round keder sits at the edge, while the flap forms the connection to the printed surface.

The keder flap is crucial because it transfers tensile forces from the profile to the material. Especially with large surface areas, outdoor applications, or interchangeable banner coverings, it plays a key role in ensuring the surface fits neatly and performs reliably over the long term.

Put simply:

The welt fits into the profile. The welt flap connects the welt to the printed surface.

Round welt insert, hollow hem, or flat textile welt?

In the field of signage and display technology, one encounters various keder solutions. Which variant is the right one depends heavily on the application, material, profile, and desired visual appearance.

Round welt insert

The round keder insert represents the classic keder. It is frequently used for tarpaulins, banners, facade coverings, or container solutions.

The round keder is inserted into a matching keder rail, securing the panel within the profile. This solution is particularly attractive when large banner surfaces need to be neatly tensioned or attached in a way that allows for easy replacement.

Typical applications include:

With a hollow hem, the edge of the material is folded over and formed into a pocket. A welt insert can be slid into this hollow hem.

This variant is frequently used when a stable edge solution is required or when the keder is not to be welded or sewn directly to the material.

The distinction is important:

A hollow hem is not automatically a welt. The hollow hem is the pocket; the welt insert is what is guided inside it.

A hem pocket can also accommodate a rod—for example, with hanging banners or ceiling-suspended displays. In this case, it is referred to as a rod-based solution rather than a classic keder rail solution.

Keder flap

With a keder flag, the keder is connected to a flat flap that is attached to the banner or textile.

This is particularly relevant for banner applications, container surfaces, and system solutions where the keder needs to be smoothly inserted into a track.

The keder flap connects the print material to the keder. It transfers tension and helps ensure the surface sits flat and neatly within the system.

Flat silicone edge graphics (SEG) and silicone keder for fabric tension frames and lightboxes

For fabric tension frames, light boxes, and high-quality interior applications, a flat welt or silicone welt is often used instead of a round banner welt.

This typically involves a flat, flexible welt (or keder strip) sewn around the perimeter of the printed fabric. The fabric is then pressed into the aluminum profile, creating a smooth, taut, and high-quality textile surface.

This solution is typical for:

The advantage lies in the exceptionally clean look and the ability to change the graphic quickly. The frame remains in place, while the fabric can be swapped out.

This is particularly important for backlit graphics. Light reveals every imperfection. A cleanly tensioned fabric—using the appropriate flat or silicone keder—ensures a smooth surface, a uniform appearance, and a professional presentation.

Piping tape, welt cord, or flat welt?

The term "piping tape" originates primarily from textile and sewing terminology. In that context, it generally refers to a bound strip containing a cord or a reinforced edge—such as those found on upholstery, bags, clothing, or textile edgings.

In the fields of advertising technology, fabric tension frames, and light boxes, however, terms such as keder strip, flat keder, or silicone keder are more commonly used.

The terms are closely related, but they are not automatically synonymous. The decisive factor is always the function:

Should an edge be given a decorative border?
Is a piece of fabric to be hung up?
Is a textile print to be clamped into an aluminum profile?
Or should a banner area be guided within a keder rail?

For professional signage and advertising technology, the following applies:

Piping tape generally refers to textile edge finishing. Flat keder and silicone keder are technical solutions for tension frames, light boxes, and interchangeable textile graphics.

Anyone asking for "piping tape" is often looking for a textile edge finishing solution. Professionals working in signage, light boxes, or textile tension frames usually require the appropriate keder solution—whether flat keder, silicone keder, hollow hem, or keder insert—tailored to the specific profile, material, and application.

What is a keder profile?

The keder profile is the counterpart to the keder insert. It is typically an aluminum profile featuring a groove into which the keder is slid.

The profile can be attached to a frame, a wall, a facade, a container, a trade fair stand, a substructure, or a light frame.

The keder profile is therefore not the graphic itself; it is the technical system that holds the graphic.

A precise fit is particularly important here: the keder diameter, material thickness, and profile must all match. Using the wrong keder in the wrong profile can result in the panel not sitting properly, being difficult to install, or not being held securely enough.

What is an awning rail?

"Kederschiene" is often another term for a keder profile. It refers to a rail into which a keder is pulled or slid.

Keder rails are used, for example, for banner frames, facade cladding, container surfaces, tarpaulins, textile systems, or temporary advertising spaces.

For customers, the distinction between terms is less important than the function:

The keder rail guides and holds the keder—and thus the printed surface.

What is a keder pole?

A keder rod is not the same as a keder rail. It is frequently used for hanging banners, fabrics, or displays.

In this process, a rod, round bar, or profile is inserted into a hollow hem. The rod can ensure that a banner hangs straight, is weighted at the bottom, or aligns neatly.

Typical applications include:

Or simply put:

The keder insert is attached to the material. The keder profile accommodates it. The keder rod stabilizes or weights a hanging surface.

Which keder size is the right one?

The correct keder thickness always depends on the profile being used. Therefore, a keder should not be selected based on guesswork.

For existing awning rails, the intended keder diameter must first be checked. For new projects, the profile, material, and keder should be planned together.

For customers, the most important thing is:

An excessively thick welt can make installation difficult or place unnecessary strain on the material. An excessively thin welt may not provide sufficient hold.

An unsuitable welt can result in the surface not sitting neatly, shifting out of position, or being impossible to tension correctly.

With keder, therefore, it is not thickness alone that is decisive, but the interplay of:

FOTOREKLAME therefore evaluates on a project-specific basis which keder insert, keder flap, profile, and material are suitable for the application.

Where is keder technology used?

Keder technology becomes relevant wherever flexible printed surfaces need to be attached neatly, tautly, and systematically.

Typical applications include:

In many cases, the keder is not visible afterwards. And that is precisely the advantage: the technical element recedes into the background, allowing the printed surface to make its impact.

Keder for banner installations

For banner installations, the keder system is particularly advantageous when a surface needs to be neatly tensioned, displayed to a high standard, or changed regularly.

A simple banner with eyelets may suffice for many applications. However, for larger, high-profile, or recurring display areas, a keder system creates a much more structured and professional appearance.

This applies particularly to:

The keder ensures that the banner is guided within a track or frame. This allows the surface to be tensioned more evenly and replaced when necessary.

This results in a clear benefit for customers:

The visible surface can be changed while the mounting system remains in place.

This is particularly interesting for seasonal campaigns, relocations, recurring promotions, or temporary brand spaces.

A good practical example is the systematic application of banners to containers. We cover this in more detail in our article on banner application, flexible graphics, and systematic container design.

Keder profiles in container design

In modern advertising technology, containers are more than just storage or construction site modules. They are used as pop-up spaces, event containers, information points, temporary retail spaces, exhibition areas, or mobile brand ambassadors.

This presents a particular challenge: container surfaces are large, visible, and often used only temporarily. At the same time, the aim is to design them to be as clean, weather-resistant, and interchangeable as possible, without causing unnecessary damage.

Keder technology can be very useful here.

A banner installation using a keder rail or track can transform the container into a flexible communication surface. The banner is finished with a keder strip or a hemmed pocket containing a keder insert, and then slid into the corresponding rail.

The advantage:

This is particularly attractive for marketing and logistics:

The container remains the same – the message can change.

That is precisely why keder technology is a powerful tool for container designs involving flexible graphics, temporary architecture, and reusable advertising systems.

Keder for light frames and textile tension frames

Flat keder or silicone keder is frequently used for light boxes and textile tension frames. It is used to secure the printed fabric into an aluminum profile.

The result is a smooth, taut, and high-quality surface.

This is particularly important for backlit images. Light reveals every imperfection; creases, ripples, or uneven tension stand out immediately on illuminated frames.

A neatly tensioned textile, on the other hand, ensures:

Typical applications include:

The frame remains in place, while the graphic can be swapped out. This is precisely what makes illuminated frames and fabric tension frames particularly attractive for companies with changing campaigns, seasonal visuals, and recurring presentations.

Keder profiles in trade fair construction and at the point of sale

In trade fair construction and at the point of sale, it is not just the design that counts; the speed, cleanliness, and repeatability of a system’s operation are equally important.

Keder systems are particularly strong in this regard because they integrate flexible print surfaces into rigid presentation systems.

A printed fabric or banner is not simply attached; instead, it is precisely guided, tensioned, and integrated into the system. This results in clean edges, smooth surfaces, and a high-quality overall appearance.

This is particularly important for:

For B2B customers, the ability to change the graphic is a particularly important factor. It is not necessary to build a new system for every campaign; if the frames, profiles, or substructures are retained, often only the graphic needs to be replaced.

This saves time, material, and coordination effort.

Keder for exhibitions, museums, and information displays

In exhibitions and museums, graphic displays often need to look high-quality while remaining flexible. Content changes, wall spaces are redesigned, traveling exhibitions move on, or individual modules are swapped out.

Keder technology can be a good solution here when textile or flexible graphic panels are to be integrated into frames or profiles.

Possible applications include:

The advantage lies in the combination of a professional look and interchangeability. A good keder system can help make exhibition spaces more modular and suitable for long-term use.

Keder for facades, scaffolding, and outdoor advertising

Keder technology can also play an important role in outdoor applications. For facades, scaffolding, mesh banners, or large-format outdoor surfaces, the mounting system must not only look good but also be robust.

Here, material, profile, installation, and wind load are particularly important.

Exterior applications should always be evaluated on a project-specific basis:

Keder technology can be an excellent solution for outdoor advertising—but only if the system, material, and installation are suited to the specific application.

Keder or eyelets: Which is better?

The short answer is: It depends on the application.

Grommets are simple, robust, and perfectly adequate for many banners. They are particularly well-suited for standard banner mounting using cable ties, bungee cords, hooks, or tensioning ropes.

Keder edges, on the other hand, often appear cleaner, more systematic, and of higher quality. They are particularly suitable when the graphic needs to be guided within a frame, a track, or a lighting system.

Eyelets are often useful for:

Welting is often useful for:

So the better question is not: keder or eyelets?

The better question is:

Which mounting method is suitable for the surface, the intended duration of use, the desired aesthetic, and the planned change of graphics?

Keder and Sustainability: Reusable Systems Instead of Single-Use Solutions

A keder is not automatically sustainable. However, a well-planned keder system can help foster a mindset geared towards reusability.

After all, if frames, profiles, keder rails, or substructures are retained, the entire system does not need to be replaced when changing the graphic; often, only the printed surface is swapped out.

This is particularly interesting for:

For companies with sustainability guidelines, this is an important consideration:

Not every new design requires a completely new system.

Keder technology can help keep visual communication flexible while allowing the technical infrastructure to be reused.

Which materials can be used with keder?

Depending on the application, various materials can be processed with keder.

These include, for example:

The important thing is: not every material suits every profile.

Keder diameter, material thickness, elongation, light transmission, wind load, fire safety, location of use, and desired service life must be considered together.

A keder, therefore, is not a single product that automatically fits every time. It is part of a system.

Common mistakes in Keder projects

Keder solutions may seem simple, but they require careful planning.

Typical errors include:

Expert advice is particularly valuable for professional B2B projects—not because keder systems have to be complicated, but because the solution needs to function reliably and seamlessly in the long run.

Typical B2B applications for piping

Keder systems are particularly attractive to companies and organizations that require flexible, interchangeable, or large-format communication surfaces.

Trade Fairs and Events

Keder systems are suitable for textile graphics, banner surfaces, light frames, free-standing systems, cubes, room dividers, and hanging elements. They allow for quick graphic changes and a high-quality presentation.

Point of Sale and Retail

Keder solutions can be used at the POS for campaign areas, light boxes, textile tension frames, window backdrops, or promotional displays. Their interchangeability is a particular advantage, especially for changing promotions.

Exhibitions and Museums

In exhibitions, keder systems help integrate large-format graphic surfaces in a clean and flexible manner. They are suitable for textile surfaces, information walls, backlit graphics, or modular exhibition systems.

Facades and outdoor advertising

For large outdoor areas, banners, mesh fabrics, or tarpaulins featuring Keder piping can be mounted within frame systems. The method of attachment is crucial, particularly for facades, scaffolding, bridge advertising, or temporary outdoor installations.

Container Design

Containers can be systematically fitted with graphics using keder technology and redesigned as needed. This is particularly useful for pop-up spaces, construction site signage, events, roadshows, or temporary brand environments.

Lightboxes and Brand Spaces

For backlit fabric graphics, the silicone edge strip ensures tension and ease of replacement. This is ideal for showrooms, reception areas, hotels, retail spaces, trade fairs, or corporate communications.

Keder briefly explained

A keder is a reinforced insert along the edge of a banner, textile, or tarpaulin. This insert slides into a keder profile or track, allowing flexible printed surfaces to be neatly attached, tensioned, and often quickly replaced.

In the signage and display industry, keder systems are used for applications such as banners, light boxes, tension fabric frames, trade fair construction, point-of-sale displays, façade advertising, and container branding.

Keder systems are particularly attractive to B2B customers because they combine flexible graphics, reusable systems, and a professional appearance. The interplay between the keder core, keder flap, profile, material, keder thickness, and application is always the decisive factor.

Conclusion: Piping strips are small details with a big impact.

Technically speaking, a welt is merely an edge detail. Yet in terms of its effect, it can be decisive.

This is because it ensures that flexible print surfaces can be professionally mounted, tensioned, and changed. This offers a major advantage for banners, textile graphics, light frames, trade fair construction, POS displays, façade advertising, and container branding.

For FOTOREKLAME, therefore, the keder is not a side issue, but a prime example of how professional advertising technology works:

Even the best image only truly comes into its own when the material, mounting, and system all work together.

FAQ: Welt, welt cord, welt profile, and welt rod

What is a keder?

A keder is a reinforced insert or edging along the edge of a flexible material. It is slid into a matching profile or keder rail and serves to keep banners, textiles, or tarpaulins taut and neatly positioned.

What is a welt insert?

The keder insert is the reinforced section at the edge of the material. It can be round, flat, flexible, sewn-in, or welded-in, and ensures that the material can be held within the profile.

What keder sizes are available?

Keder strips come in various diameters. Depending on the system and application, typical thicknesses range, for example, from approximately 4 mm to 14 mm. The decisive factor is always which Keder strip fits the existing or planned Keder profile.

What is a keder flag?

A keder flap is the flat connecting section between the keder itself and the banner, tarpaulin, or textile. It is typically welded or sewn on and ensures that the keder effectively transfers tensile forces to the printed surface.

What is the difference between a keder flap and a hollow hem?

With a keder flag, the keder is attached to a flat flap that is secured to the material. In the case of a hollow hem, the material is formed into a pocket into which a keder insert or rod can be slid.

What keder size do I need for my banner?

This depends on the keder profile, the material, the surface area, and the location of use. For existing keder tracks, the appropriate keder diameter must be verified. For new projects, the profile, material, and keder should be planned in conjunction with one another.

Is a thicker welt always better?

No. A thicker welt is not automatically better. It has to match the profile. If it is too thick, it will be difficult or even impossible to insert. If it is too thin, the panel cannot be held securely or tautly enough.

What is a flat welt?

A flat silicone edge graphic (SEG) strip is a flat piping solution frequently used for textile tension frames, lightboxes, trade show walls, and POS systems. It is typically sewn around the perimeter of the printed fabric and then pressed into an aluminum profile.

What is a silicone keder?

A silicone welt is a flexible, often flat strip made of silicone or a silicone-like material. It is used with textile tension frames and lightboxes to ensure the fabric graphic fits tautly and neatly within the frame and can be changed when necessary.

Is piping tape the same as flat welt?

No, not automatically. Piping tape originates more from textile and sewing technology and typically refers to an edged or reinforced edge, often incorporating a cord. Flat keder, on the other hand, is a technical keder solution for textile tension frames, light boxes, and framing systems.

What is the difference between piping tape and silicone keder?

Piping tape is primarily used for finishing textile edges. Silicone keder is usually sewn around the perimeter of a printed fabric and then pressed into an aluminum profile—for example, in lightboxes or textile tension frames.

When do you use the term "Kederband"?

"Keder tape" is frequently used as a general term for textile or technical keder solutions. Depending on the application, it may refer to a round keder insert, a keder flap, a flat keder, or a silicone keder. The key factor is always selecting the right system.

What is a keder profile?

A keder profile is the rail or profile into which the keder is inserted. It is often made of aluminum and is used, for example, for banners, light boxes, textile tension frames, facade coverings, or container designs.

What is an awning rail?

A keder rail is the profile that accommodates the keder. It is attached to frames, walls, facades, containers, or other substructures.

What is a keder pole?

A keder rod is typically a rod or round profile inserted into a hem to keep a banner or textile straight, weigh it down, or hang it up. It is not the same as a keder profile, but belongs to the same family of mounting and tensioning solutions.

What is a welt used for?

Keder profiles are used for banners, tarpaulins, textile prints, light boxes, trade fair walls, POS systems, facade coverings, container graphics, exhibitions, and many other flexible print surfaces.

Which is better: keder or eyelets?

That depends on the application. Grommets are simple and robust. Keder systems generally look cleaner, more systematic, and higher-quality. Keder is often the better solution, especially for frame systems, lightboxes, tension fabric frames, and interchangeable graphics.

Can a banner with keder be changed?

Yes. That is precisely one of the major advantages. If the profile or frame is retained, often only the banner or textile needs to be replaced.

Are keder systems suitable for outdoor use?

Yes, keder systems can also be used outdoors. In such cases, the material, profile, mounting, wind load, weather conditions, and installation must be assessed on a project-specific basis.

Are keder systems suitable for trade fairs and the POS?

Yes. Keder systems are particularly popular in trade fair construction and at the point of sale because they offer a high-quality look, taut surfaces, and quick graphic changes.

What is the difference between piping and a hollow hem?

A hollow hem is a folded-over or fabricated pocket along the edge of a material. A keder insert or a rod can be slid into this hollow hem. The keder is the insert or reinforced guide, while the hollow hem is the textile or tarpaulin-based sleeve formed on the material.

Is a keder suitable for container design?

Yes. Especially with containers, keder rails and keder inserts can help mount banner surfaces so they are neat, taut, and interchangeable. This is particularly relevant for construction sites, events, pop-up spaces, temporary retail locations, and mobile brand communication.