Insulation parts
Fringed Insulation Tapes for Radii and End Windings
Fringed tapes are insulation strips with notched edges that lie flat around radii and curved surfaces.
A flat insulation tape cannot follow a radius without buckling on the inside and stretching on the outside. Fringing solves this: the edge is notched at a regular spacing, the fringe pitch, so that the individual tabs overlap or spread when laid. The tape follows the contour, stays flat and keeps its insulating effect over the whole surface.
Fringed tapes are used wherever insulation has to cover curves: on end windings of motors and generators, on coil edges and bent conductors in transformers, as edge protection on laminated cores and as end covers on coils. In large machines they replace laborious manual cutting and give reproducible insulation.
We produce fringed tapes notched on one or both edges, with fringe depth and fringe pitch to your drawing, as rolls or as cut strips.
Fringe to drawing
The fringe geometry determines how tight a radius can be covered. A small fringe pitch and deep notches for tight radii, a large fringe pitch for wide curves. The tabs are rectangular, with fringe depth and fringe pitch set to your specification. With fringing on both edges a continuous web remains in the middle, its width set to your specification. The cutting tools are made in our own tool shop.
Materials
For thermal class H and above we process Nomex aramid paper, for transformer construction pressboard with high oil resistance, for classes B and F NPN laminate and for the highest temperatures Kapton polyimide film. On request we supply the tapes with an adhesive layer so they fix themselves during assembly.
Manufacturing at Hauler & Hermann
Fringed tapes are made on our slitting lines in a single pass: the material is slit to width and the fringe is cut at the same time. The fringe pitch stays constant over the whole roll length. We supply rolls with a defined running length or cut strips, magazined or bundled. Production is certified to DIN EN ISO 9001 and DIN EN ISO 14001.
Selection criteria for purchasing and design
For a quotation we need material and thickness, tape width, fringe depth and fringe pitch, one or both edges, and the delivery form as roll or strip. Tell us the smallest radius to be covered and we propose a suitable fringe. Send us your enquiry via the contact form.
Product view
Production drawing: fringed on both edges, tape width 160 mm, fringe depth 5 mm, fringe pitch 2.5 mm
Frequently asked questions
What is a fringed tape?
An insulation strip whose edge is notched at a regular fringe pitch. The resulting tabs overlap or spread when laid, so the tape follows a radius without wrinkling.
What does fringe pitch mean?
The fringe pitch is the distance from notch to notch. Together with the fringe depth it determines how tight a radius can be covered. The smaller the fringe pitch, the tighter the possible radius.
Where are fringed tapes used?
For insulating end windings, coil edges, bent conductors and end faces in motors, generators and transformers, and as edge protection on laminated cores.
Fringed on one or both edges?
Tapes fringed on one edge wrap around an edge, tapes fringed on both edges cover curved surfaces with a continuous web in the middle. Which version fits depends on the contour.
Which materials are available?
Nomex aramid paper, pressboard, NPN laminate and Kapton polyimide film, depending on thermal class and environment. With adhesive layer on request.
Does Hauler & Hermann supply rolls or strips?
Both. Rolls with a defined running length for processing from the reel, cut strips for assembling individual coils.
More Products
Nomex 410 Aramid Paper
Nomex 410 by DuPont is the original aramid paper.
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Pressboard for Transformers and Electric Motors
Pressboard is a natural product made from cellulose fibres and has been used in transformer and motor construction for many years.
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Cut Parts and Cover Strips
Cut parts, often used as cover strips in the slot, are among our standard tasks.
Learn more →Do you have a specific requirement?
Talk to us. We will find the right insulation solution.