Technical fundamentals and process principle
In Kiss-Cut, the cutting edge is set so that the face material and adhesive are fully separated. The liner serves as a defined stop. Key parameters are cutting force, cutting gap, blade height, cutting edge quality, and the mechanical stiffness of the laminate. Process control depends on material thickness, adhesive system, and liner hardness.
Process variants
- Rotary die cutting: continuous process with cylindrical tools. High cycle rates, very good registration, ideally suited for roll material. Tools either as solid carbide or as flexible die cutting plates on a magnetic cylinder.
- Flatbed die cutting: high cutting forces at large formats. Good for medium series and thicker materials.
- Laser Kiss-Cut: non-contact half-cut. Ideal for small batch sizes, variable geometries, and the finest contours. Parameters are laser power, focal position, and feed rate.
- Digital plotter: uses oscillating or tangential knives. Suitable for prototypes and pilot series.
Materials and laminate build-up
- Face material: polyimide Kapton for high-temperature insulation, polyester HOSTAPHAN or Mylar for electrical insulating films, PET or PVC for technical labels, aramid paper Nomex for thermally stable insulating parts, PTFE and POM for sliding and sealing functions, technical nonwovens.
- Adhesives: acrylate for broad adhesion profiles and ageing resistance, silicone adhesives for high temperatures and low-energy surfaces, rubber systems for very high initial tack.
- Liner: siliconised paper for standard applications, PET liner for high temperature stability and precise half-cuts.
Quality characteristics, tolerances, inspection points
An industrial-grade Kiss-Cut is characterised by reproducible peel force, burr-free cut edges, and an undamaged liner surface. Important inspection points are dimensional accuracy, squareness, freedom from tearing, low particle content, and visual contour fidelity. The achievable tolerance depends on the process, tooling, material, and web guiding. Rotary processes with register control achieve particularly consistent results. Laser processes deliver very fine contours, but require thermal management so as not to affect adhesive and carrier.
Typical influencing factors
- Material thicknesses and layer build-up
- Cutting gap, tool sharpness, contact pressure
- Registration with multilayer laminates
- Temperature control in laser Kiss-Cut
- Deburring and particle management near cleanroom conditions
Applications in electrical, automotive, and industry
- Electrical insulation industry: Kiss-Cut of polyimide Kapton adhesive tapes as solder masks, masking for coatings, insulating films for gap and creepage distances, Nomex interlayers, Polyester Films as spacers.
- E-motors and hairpin windings: pre-cut adhesive films and insulating labels for slot insulation, slot liner fixation, and edge covering.
- Automotive: sealing contours, adhesive pads for sensor mounting, EMI shielding films with conductive adhesives, thermal pads in predefined geometries.
- Electronics manufacturing: ESD labels, nameplates, serial numbers, traceability labels, double-sided adhesive films for component fixation.
- General mechanical engineering: masking, damping elements made of nonwoven or foam, PTFE sliding strips, POM spacers.
Process chain and economic efficiency
Kiss-Cut integrates into roll-fed Converting Processes. Typical steps are laminating, bonding, web edge control, Kiss-Cut, Matrix Stripping, rewinding onto a roll, or singulation into sheets. For high productivity, stable Matrix Stripping is decisive. It reliably removes the punching matrix without detaching parts from the liner.
Tooling strategy
- Flexible die cutting plates reduce set-up costs for frequent variant changes.
- Solid cylinders deliver maximum tool life at very high quantities.
- Lasers reduce tooling costs for prototypes and small series.
Make-or-buy decision
Contract slitting is attractive with changing geometries, strict cleanliness requirements, and the need for combined processes such as laminating, perforating, and printing. In-house equipment pays off with high annual volumes, stable geometries, and continuous utilisation.
Selection criteria for engineering and procurement
- Function: adhesion, temperature range, electrical properties such as dielectric strength, insulation resistance, and surface resistance.
- Material: polyimide, polyester, Nomex, PTFE, PVC, technical nonwovens. Selection according to environment, media, and standards.
- Geometry: inner radii, web widths, minimum web for Matrix Stripping, tolerance requirements.
- Process: rotary, flatbed, laser, or digital cutting. Decision based on batch size, cycle time, and contour complexity.
- Liner choice: paper for standard, PET for precision and temperature.
- Further processing: roll material, sheet material, pick-and-place, manual assembly.
- Quality assurance: sampling plan, initial sample inspection, process capability indices, traceability.
Advantages and typical challenges
Advantages
- Parts remain ordered on the liner, easy removal, and fast assembly.
- High process speed in roll-to-roll operation.
- Short set-up times with flexible die cutting plates and digital cutting.
- Clean edges with correct parameter setting, reduced rework.
Challenges
- Risk of liner damage from incorrect contact pressure or dull tooling.
- Cutting dust and particles from fibrous materials, depending on the cutting method.
- Thermal influence on the adhesive during laser cutting.
- Stable Matrix Stripping for delicate contours.
GOBA Takeaway
Kiss-Cut is the key process when pre-cut formed parts from films and adhesive tapes are to be provided in an ordered, dimensionally accurate, and assembly-friendly manner. For electrical insulating parts, labels, and sealing contours, the half-cut offers high productivity in roll processes and reliable quality. Decisive factors are a suitable laminate build-up, the right choice of process, and precise register and web guiding. Anyone who matches materials, liner, and adhesives to the application and designs Matrix Stripping for stability achieves reproducible results alongside cost-effective manufacturing.