Keder – What You Need to Know

What is Keder?

Keder is a rope edge product that allows connecting a fabric panel to a frame. It combines the ability to slide lengthwise, for easy install, with having the full strength of the fabric available when pulling directly on the frame. It is usually made with the fibers exposed on the outside to make it easier to slide.

Why Choose Us?

Lightweight Manufacturing is a major distributor of keder and keder rails in the US market. For over ten years we have partnered with customers to walk them through the buying process and ensure they receive the right products for their specific fabric application or project. We also understand that our customers want a solution that is easy to install, will provide solutions to issues like water leakage and is also aesthetically pleasing.

How do I know which type of keder I need for my project?

Keder can be largely separated into three main styles differentiated by their attachment method: sewing keder, single-flag weldable keder, and double-flag weldable keder.

Sewing Keder

Sewing keder is the simplest of the three to attach, it uses a flag that is welded shut designed to be easy to sew to a panel. This is often a great choice for signs and banners but can be used also for larger applications like awnings and canopies.

However, it is important to note that most sewing thread is not designed for UV-resistance and thus this is not a suitable method when durability, especially against sunlight exposure, is an important property. Special PTFE thread can offer long-term durability.

Single Flag Keder

Single flag keder is designed to be attached by any welding method, including hot air, wedge, and radiofrequency. The lack of thread improves UV resistance, water tightness, and bond strength. The single flag can be attached to a panel faster than other types, but still has a major downside.

Having a single flag means the weld on the keder becomes a single point of failure. This is why single flag often uses wider 20mm welds, and why it’s highly recommended to use RF welded single flag keder, like all the types distributed by our company. Even with these measures, however, it’s likely that the keder weld will remain the weakest point of the panel, which isn’t an issue in many applications but can become a problem for larger panels with high tensile loads.

Keder Flags | Description of single flag keder

Double Flag Keder

Double-flag keder is the strongest and most durable, but can only be welded properly using a radio-frequency (RF) welder, which can be cost-prohibitive for smaller companies

The weld is no longer a point of failure, both sides of the flag are welded to the panel and so the fabric strength itself becomes the strength limitation.

Keder flags | Description of double flag keder

How do I know which style I need for my project?

There are many different factors to consider when it comes to choosing the right keder: diameter, flag style, flag width, fabric strength and weave, color, and roll length. Our team of experts are always happy to review which style is the best for your project, while still ensuring it is aesthetically pleasing, while also ensuring the best keder for your project that will balance quality, durability, and aesthetics with a competitive price.

Weave Styles

There are two common weaves: the plain weave and the panama style weave .

Plain weave is the most basic form of weaving. Each weft yarn crosses the fill yarns up and under. The next weft yarn goes over the fill yarn that the previous weft yarn went under and so on.

A Panama weave is a variation, whereby 2 yarns next to each other go up and under, as well in the weft as the fill direction. The Panama weave allows a greater strength of the fabric with the same yarn size because more yarn can be woven per inch.

keder weaves | plain vs. panama

Thread Weight

There are different strengths when it comes to fabric thread, this is measured using either the denier or the Dtex scale. Keder with thicker thread tends to be more durable and to slide better. However, thicker threads tend to cost more. Lightweight Manufacturing offers keder in three different thread weights, 2000 Denier, 1500 Denier, and 1000 Denier. Our team helps customers find the best thread weight for their project that will balance the quality, durability, and aesthetics they’re seeking with a competitive price.

What are keder extrusions? How do I know what size I need to order with my keder panels or keder rails?

Keder extrusions (also known as keder rails) are aluminum extrusions designed to allow keder and rope edges to slide into them, securing fabric panels in a way that is safe and efficient and can be added to almost any existing frame with minimal alterations. The rails can offer solutions for awning and shade, tenting and structures, as well as banners and billboards.

When placing your keder panel or keder order just let our team of experts know that you would like keder rails with your order and they can include the cost in your quote. We offer powder coating and other finishing options at an additional cost. Review our rail catalog for some of the extrusions we have in stock.

We are always happy to help you find the best solution for your project.

This is why we also offer engineering & design servicesfabric for industrial panels, as well as, manufacturing services for fabric panels. Don’t forget to check out our available keder products in our Eurokeder Catalog or Kedermaker Catalog. To get more information or free samples of our product, please fill in the form, email us, or reach out to one of our experts at (610)435-4720

Please note that Lightweight Manufacturing is committed to respecting your privacy and protecting your personal information and will always treat it with the utmost care and will never share your information with any third party.