Multi-layer labels can be categorized into three types: multi-layer composite labels, multi-layer folding labels, and multi-layer flip-page labels.
1. Multi-layer composite labels: These are multi-layered labels where layers are stacked and bonded together. They resemble ordinary self-adhesive labels, but each layer can be repeatedly peeled and reattached to reveal the printed content.
2. Multi-layer folding labels: These include spring-loaded, wave-shaped, and accordion-style folding labels, as well as multi-layer instruction manual labels. Peeling off the first layer reveals the underlying layers, or sometimes the first layer can be opened from both ends and folded back to reveal a single sheet.
3. Multi-layer flip-page labels: Peeling off the first layer reveals hidden content, similar to turning the pages of a book.