Taping
Taped high frequency litz wire constructions are mainly suitable for applications requiring a high break down voltage. Taping gives litz wire improved capability to withstand flexing and mechanical stress. Self-adhesive tape material increases protection against re-opening during and after manufacturing processes and thus secures the compliance with defined creepage distance.
Some tapes can be thermally sealed, when used in conjunction with certain wire enamel types.
The individual wires excellent adhesion and bonding characteristics can be achieved. Thermally sealed tapes can be selected from a number of material types for special applications all promoting various degress of flexibility and mechanical protection for the litz wire construction.
| Features and Benefits of Tapes | ||||||
|---|---|---|---|---|---|---|
| Variants | Dielectric strength | Flexibility | Splicing | Contacting | ||
| Standard | high | very good | good | very good | ||
| Thermally Sealed | elevated | medium | very good | very good | ||
| Self-Adhesive | very high | good | very good | good | ||
| Dimensions
| Applications | |||
| Content | • Inverters | ||||
| Diameter of single wires | 0.040-0.500 | mm | • RF transformers | ||
| Outer diameter of litz wire | 0.50-10.0 | mm | • RF transducers | ||
| Overlapping single tape | 50 or 67 | % | • RF chokes | ||
| Numbers of tapes (max.) | 2 | • Inductive charging |
Technical Data Sheet of Tapes
| PET | PEN | PI | ||||
| Description | Polyester | Polyethylene Naphthalat | Polymide | |||
| Colour | transparent | transparent | brown | |||
| Standard | PET | PEN | PI | |||
| Breakdown volltage | kV | 5.0 (VDE 0345) | >5.0 (JIS C 2318) | 5.0 (ASTM D 149) | ||
| Insulation class (UL) | °C | 105 (A) | 180 (H) | 200 (C) | ||
| Insulation class (VDE) | °C | 130 (B) | - | 200 (C) | ||
| Dielectric constant | εr | 3.3 (VDE 0345) | 2.9 (JIS C 2318) | 3.4 (ASTM D 150-92) | ||
| Flammability | °C | 400 (VDE 0345) | V-0 (IEC 60695-11-10; UL94) | |||
| UL-File No. Tapes* | E53895 | E206562 | E39505 | |||
| Processing | fusible | fusible | machanical stripping | |||
| Thermally Sealed | PET | PEN | PI | |||
| Breakdown voltage | kV | 5.4 (ASTM D 149-81) | - | 5.0 (ASTM D 149) | ||
| Insulation class (UL) | °C | 105 (A) | - | 200 (C) | ||
| Insulation class (VDE) | °C | 130 (B) | - | 200 (C) | ||
| Dielectric constant | εr | 3.26 (ASTM D 150-81) | - | 3.4 (ASTM D 150-92) | ||
| Flammability | n.a. | - | V-0 (IEC 60695-11-10; UL94) | |||
| UL-File No. Tapes* | E93687 | - | E39505 | |||
| Processing | fusible | - | mechanical stripping | |||
| Self-Adhesive | PET | PEN | PI | |||
| Breakdown voltage1 | kV | 5.0 | 5.0 | 5.0 | ||
| Insulation class (UL) | °C | 130 (B) | 180 (H) | 180 (H) | ||
| Dielectric constant | εr | 3.2 (JIS C 2318) | 2.9 (JIS C 2318) | 3.3 (JIS C 2318) | ||
| Flammability | - | flame retardant (UL 501) | flame retardant (UL 501) | |||
| UL-File No. Tapes* | E93687 | E206562 | E39505 | |||
| Processing | fusible | fusible | mechanical stripping |
|
1 approximate value
* the used foils are variants of UL recognized products
Other materials on demand
Special constructions with VDE-approval for high voltage applications available:
| VDE - certified acc.: | DIN EN 60950, annex U |
| DIN EN 61558, annex K | |
| DIN EN 60601, annex L |