Polyimide Tape With Liner
Polyimide tape with liner is a single-sided PI film tape made for die-cutting, kiss-cutting, automatic placement, and pre-cut insulation parts. OPALUS PACK manufactures this liner-backed tape for production teams that need clean edges, controlled release, and stable handling before placement. The release liner protects the adhesive during converting, keeps small parts in position, and supports roll-fed or sheet-fed assembly. It is not double-sided polyimide tape.
- Material: Polyimide film
- Adhesive: Single-sided silicone PSA
- Liner: PET release liner, approx. 75 um
- Liner Weight: 100 – 120 g/m2
- Color: Amber, black, or custom
- Format: Rolls, sheets, kiss-cut parts, die-cut shapes
Product Overview
This product is built for converters and assembly plants that need more than a standard hand-applied PI tape roll. The tape has adhesive on one side only. The adhesive face is protected by a release liner until the part is peeled and applied.
The liner is not just a covering layer. It affects cutting accuracy, part retention, winding behavior, and pickup stability. In our production checks on small PI parts below 10 mm, PET liner-backed samples showed about 18-25% better dimensional stability during kiss-cutting than unsupported PI tape formats. The improvement came from reduced film rebound and better adhesive support under blade pressure.
For small discs, tabs, frames, pads, or narrow insulation strips, PET liner helps prevent part shifting during winding and storage. It normally holds flatter than paper liner and gives cleaner separation during pickup. Paper liner may still work for larger sheeted parts, but it is less suitable for dense layouts with fine gaps or very small geometry.
Benefits
- Single-sided structure, not two-side bonding tape
- Helps small parts below 10 mm stay flatter after cutting
- Supports cleaner die-cut edges with lower adhesive burr risk
- PET liner improves dimensional stability in dense layouts
- Controlled release force keeps parts fixed before pickup
- Suitable for vacuum pickup, manual peeling, and feeder use
- Reduces part movement during winding, storage, and handling
- Converts into pads, discs, strips, frames, tabs, and profiles
How does release liner influence die-cut accuracy in polyimide tape applications?
In die-cutting and kiss-cutting, the liner works as a process support. If it stretches, curls, or releases too easily, the tape part may move before the blade completes the cut. That can cause lifted corners, uneven spacing, or rough edges.
A 75 um PET liner usually gives better support than lightweight paper liner when the layout contains narrow parts. In our converting trials, PET liner reduced edge distortion in parts below 5 mm because the adhesive layer stayed better anchored during blade contact. For tight-tolerance layouts, medium release force keeps parts on the liner during cutting and winding, while still allowing clean pickup.
TDS
| Item | Typical Value |
|---|---|
| Product Type | Single-sided polyimide tape with liner |
| Film Material | Polyimide film |
| Adhesive Type | Silicone pressure sensitive adhesive |
| Liner Material | PET release liner |
| Liner Thickness | Approx. 75 um |
| Liner Weight | 100 – 120 g/m2 |
| Total Thickness | 0.05 – 0.18 mm |
| Standard Color | Amber |
| Optional Color | Black or custom |
| Adhesion to Steel | 3.5 – 6.0 N/25mm |
| Release Force | 10 – 25 g/25mm |
| Temperature Resistance | -73C to 260C |
| Dielectric Strength | >= 6.0 kV |
| Tensile Strength | >= 115 N/25mm |
| Elongation at Break | >= 40% |
| Cutting Format | Kiss-cut, die-cut, sheeted, roll-fed |
| Storage Suggestion | 23C, 50% RH, original sealed condition |
Applications
- Kiss-cut PI insulation pads for electronic assembly
- Die-cut polyimide parts for compact devices
- Battery module insulation tabs and protection pieces
- Coil, motor, and transformer insulation parts
- Sensor protection pads and connector masking shapes
- Flexible circuit process protection
- Roll-fed adhesive parts for automatic placement
- Pre-cut thermal masking parts requiring clean pickup
What makes single-sided PI tape on release liner suitable for automatic placement systems?
Automatic placement works best when each part stays flat, holds position, and releases at the right moment. Single-sided PI tape on release liner gives this control because the adhesive stays protected until pickup. The part can travel on a roll or sheet without exposed adhesive touching guides, rollers, or nearby components.
For vacuum pickup, release force is the key balance. If release is too light, parts may shift during winding. If it is too tight, the nozzle may fail to lift the part cleanly. A controlled 10-25 g/25mm range is often a practical starting point for small converted PI tape parts.
FAQ
Is polyimide tape with liner double-sided?
No. It is single-sided. The adhesive is coated on one side of the PI film, and the release liner only protects the adhesive before use.
Which liner is better for small die-cut parts?
PET liner is usually better for small or narrow parts because it offers stronger dimensional stability and cleaner kiss-cut behavior than paper liner.
Can the tape be supplied as pre-cut shapes?
Yes. It can be made into discs, pads, strips, frames, tabs, washers, and other converted shapes based on drawings or samples.
What release force should be used for automatic placement?
A medium controlled release is usually recommended. For many applications, 10-25 g/25mm is a useful range, but the final value should match the pickup method and part size.