Solutions and methods to common problems in double-sided tape die-cutting processing

What is Double-Sided Tape?

Double-sided tape is a type of adhesive tape made by coating elastic or resin-based pressure-sensitive adhesives evenly on both sides of a substrate, such as paper, fabric, or plastic film. The tape is typically wound into rolls and consists of three main components: the substrate, the adhesive, and a release liner (or film). Depending on the substrate, surface treatment may be required before the adhesive is applied.

Common Issues and Solutions in Die-Cutting Double-Sided Tape

When die-cutting double-sided tape, several issues can arise, such as rough or frayed edges. These issues often occur due to tension exerted by the cutting blades on the tape during the die-cutting process. If the tape is not fully cut through, the tension can cause it to tear, leading to jagged or frayed edges.

To address these problems, it's essential to choose the right type of die-cutting blade based on the tape used. The texture and height of the blade's edge directly affect the quality of the die-cutting process and the longevity of the blade.

When preventing frayed edges on double-sided tape, using a straight-blade cutter is preferred over a cross-blade cutter. Here are three key points to pay attention to during the process:

Bond the Tape First: Ensure that the double-sided tape adheres properly to the attachment frame and reinforcement ribs first. Do not touch the adhesive surface or the cleaned area with hands or any other items after removing the release liner.

Clean the Surfaces: Use a mixture of isopropyl alcohol and water (1:1 ratio) or xylene to clean the composite board, attachment frame, reinforcement ribs, and bonding areas of the double-sided tape.

Secure the Frame: Insert the frame with the double-sided tape into the composite board. Gently tap the frame with a rubber mallet to ensure the board's edge fits tightly into the frame's groove, securing the tape and ensuring a strong bond. The gap between the folded edges of the composite board should be no larger than 0.4mm.

Key Considerations When Slitting Double-Sided Tape

When slitting double-sided tape, improper adjustment of cutting tools or dull blades can cause cracks or tears on the top or bottom paper layers. These cracks may also cause fibers to stick to the adhesive. The occurrence of these cracks can be continuous or random and may appear on one or both sides of the tape roll. Therefore, it's essential to inspect the top and bottom papers for small cracks before processing the tape.

After inspection, remove a segment of the tape and peel the release liner. Carefully check both the top and bottom papers for cracks, as these may be very small and only visible once the papers are separated.

How to Check for Frayed Edges in Die-Cut Double-Sided Tape

Ensuring clean, undamaged edges is crucial for maintaining the quality of double-sided tape. Before processing, carefully inspect the slitting edges of the tape for any frayed or damaged areas, as well as for any issues caused by improper storage or transportation. Unroll 4–5 circles of tape from the roll and check the slitting edges thoroughly.

Checking for Adhesive Contamination and Silicon Coating Issues

If the edges of the double-sided tape are sticking together or if the bottom paper has areas with incomplete silicone coating, these issues can cause the release liner to break during production, disrupting the process. Before processing, test a sample of the tape (about 1 meter in length) by peeling it off by hand. Check if the edges or any other areas peel smoothly and uniformly. Usually, adhesive contamination happens in specific parts of the tape roll, typically in the outer 7–10 meters.

Additionally, note that lighter release liners (e.g., 60g/m² or 80g/m²) require more effort to peel than heavier ones, so the tape may feel tighter when peeling. This means that if the tape is cut into custom shapes as per customer requirements, some tapes may not be processed at normal speeds due to these differences.