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Keder is a type of flexible edging or trim that is commonly used in the fabrication of outdoor fabric products. It's made up of a cord or rope that’s usually encased in a fabric sleeve, and it is designed to be inserted into a groove or channel in a frame or structure.
This design allows fabrics, like those used in tents, awnings, tarps, or boat covers, to be easily secured and tensioned onto the frame without the need for additional hardware like rivets or grommets.
The fabric sleeve around the keder cord (or the keder itself) is typically designed to be inserted into a channel or track. Once it's inserted, the fabric is held tightly in place. This can allow for easy removal, replacement, or adjustment of the fabric as needed. The keder also gives the fabric a neater, more polished appearance since the edges are not raw or unfinished.
There are various types of keder, depending on the specific needs of the application:
Standard Keder: This is the basic type of keder, made of a cord covered by fabric. It's commonly used for lighter-duty applications.
Heavy-Duty Keder: This type has a stronger, more durable cord (sometimes with a steel or plastic insert) and is typically used for more heavy-duty or industrial applications like large tents, awnings, or heavy tarps.
PVC-Coated Keder: This type of keder is coated with PVC (similar to the fabric you might be using for your PVC-coated polyester). It’s particularly useful for outdoor applications where extra durability and weather resistance are needed.
Sewn-In Keder vs. Insertable Keder: Some keder types are sewn directly into the edge of the fabric (like on certain boat covers or tarps), while others come as a separate piece that can be slid into a groove or track.
Keder is commonly used in various industries and applications:
Tents & Canopies: Keder is used to secure the fabric edges to the tent frame. It ensures the fabric is tight and smooth, with no gaps.
Awnings: Many outdoor awnings use keder to secure the fabric in place on a metal or aluminum frame. This method allows for easy removal or replacement of the awning fabric.
Boat Covers: Marine fabrics often use keder to attach covers securely to the frame of boats. The keder helps to hold the fabric tightly and prevent it from flapping in the wind.
Outdoor Furniture: Keder can also be used in outdoor furniture covers or cushions to give a clean finish while ensuring durability in outdoor conditions.
Banners & Displays: For large display banners or signs, keder can be used to secure the fabric to a frame for both temporary and long-term applications.
Secure Fit: It keeps the fabric tightly fitted to a frame, which is important for preventing wind or weather damage, especially in outdoor conditions.
Easy to Install: Keder makes it simple to attach fabric to a structure, and it’s easy to slide in and out of channels or grooves for replacement or adjustment.
Neat Finish: Keder gives the fabric a cleaner, more professional look by covering the raw edges and preventing fraying.
Durability: The materials used in keder (like PVC-coated polyester) are strong and resistant to weather, UV rays, and abrasion, which makes it an excellent choice for outdoor products.
Versatility: It can be used in a variety of industries, from outdoor furniture to marine applications and even signage.
Keder is typically manufactured in a few steps:
Cord Creation: A durable cord (often made from polyester or nylon) is created. For heavy-duty keder, this may be a reinforced cord, sometimes with a steel or plastic core.
Fabric Sleeve: The cord is then covered with a fabric sleeve, which may be made from polyester, PVC-coated polyester, or other durable materials.
Sewing or Molding: For sewn-in keder, the cord is sewn into the edge of the fabric. For insertable keder, the sleeve may be made to fit snugly into a groove or channel.
Keder can also come in various colors to match the fabric or provide a contrasting trim.
Size of the Channel: Make sure the keder cord is the right size for the channel or groove it will be inserted into. Too large, and it won’t fit; too small, and it could slip out or not secure the fabric properly.
Weather Conditions: If the fabric will be exposed to harsh weather conditions, it’s essential to choose the right keder (like a UV-resistant or waterproof keder) to ensure long-term durability.
Fabric Type: Choose a keder that’s compatible with the fabric being used. For example, if you’re using PVC-coated polyester, you’ll likely want a PVC-coated keder to ensure a durable, weather-resistant fit.
Keder is a highly practical and versatile solution for securing fabric to a frame, providing a clean and durable finish. It’s perfect for outdoor products that need to be tightly fitted and resistant to the elements. Whether you’re working with tents, tarps, awnings, or marine covers, keder is an ideal way to make your fabric edges neat, secure, and long-lasting.