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Plastic Welt and Flat Keder

Plastic Welt and Flat Keder for Textile Graphics

Sew-in thermoplastic edge profiles in 10 x 3 mm, 12 x 3 mm and 14 x 3 mm sizes for compatible aluminium display frames and tensioned textile graphics.

Overview

Plastic welt, also called flat keder in parts of the display market, is sewn into the edge of a printed textile graphic. The finished edge is inserted into a compatible aluminium frame channel to tension the fabric and create a clean display surface.

Kedermaker's approved size scope for this revision is 10 x 3 mm, 12 x 3 mm and 14 x 3 mm, stated as width x thickness. Size selection must be checked against the frame channel, profile hardness, fabric thickness, seam position and required insertion force.

Key Advantages

Three clear size options - 10 x 3, 12 x 3 and 14 x 3 mm cover common project requirements in the approved range.
Sew-in edge construction - Integrates with printed textile graphics using established sewing processes.
Clean, tensioned appearance - Supports smooth display surfaces when matched to the correct frame and sewing pattern.
Repeatable graphic changes - Compatible systems allow the fabric graphic to be removed and replaced while retaining the frame.
Thermoplastic alternative - Provides an alternative to silicone edge materials for suitable channels and production methods.
Sample fit review - Physical samples help confirm insertion, retention and finished appearance before production.

Size Comparison

Size	Selection guidance
10 x 3 mm	Compact width for compatible narrow channels and lighter textile graphics
12 x 3 mm	Mid-width option for compatible general display-frame applications
14 x 3 mm	Wider profile for compatible channels requiring increased inserted width

10 x 3 mm Plastic Welt

The 10 x 3 mm profile is the narrowest option in the approved range. It should be evaluated for frames with a compatible channel and for fabric constructions where a compact sewn edge is preferred.

12 x 3 mm Plastic Welt

The 12 x 3 mm profile provides an intermediate width. It can be considered for general textile-frame projects after the channel, seam allowance and insertion force are checked with a sample.

14 x 3 mm Plastic Welt

The 14 x 3 mm profile provides the widest inserted edge in this range. It must be used only with a compatible channel and an approved sewing construction.

Applications

Plastic Welt / Flat Keder is used in LED frames and lightboxes, backlit and front-lit textile displays, exhibition stands, retail interiors, wall graphics, hanging displays and replaceable printed-fabric systems.
Fit and Sewing Review
Send the aluminium frame drawing or a cut rail section. State the fabric type, seam allowance, stitch position and whether the graphic is installed from the front, side or another direction.
The correct size should insert without damaging the graphic and retain the fabric at the required tension. Final suitability requires a physical trial in the actual frame.
Quality and Manufacturing
Inspection can cover width, thickness, colour, roll presentation and sample fit. Required hardness, tolerances and material grade should be confirmed in the approved specification rather than assumed from nominal size.

What to Send for a Quote

required size: 10 x 3, 12 x 3 or 14 x 3 mm;
frame drawing or rail sample;
textile graphic and backing details;
sewing and seam construction;
preferred colour and roll length;
order quantity and delivery country;
labels, cartons and pallet requirements;
sample quantity required for fit trials.

FAQ

Is plastic welt the same as flat keder?
The terms are often used for the same sew-in thermoplastic edge in textile display systems. Confirm the dimensions and material rather than relying on the name alone.
Which sizes are included on this page?
The approved range in this revision is 10 x 3 mm, 12 x 3 mm and 14 x 3 mm, stated as width x thickness.
Will one size fit every aluminium frame?
No. Frame channels differ. Always test the proposed size in the actual rail with the intended fabric and sewing construction.
How do I choose between 10, 12 and 14 mm width?
Start with the frame manufacturer's channel specification, then confirm insertion and retention with physical samples.
Can the profile be sewn with standard equipment?
Many fabricators use industrial sewing equipment, but needle, thread, seam allowance and stitch position must suit the material and graphic.
Can the graphic be replaced?
In compatible frame systems, the welted textile graphic can be removed and replaced. Follow the frame supplier's installation procedure to avoid damage.