The core competitiveness of coated paper stickers lies in the coating process of the substrate material, with production focusing on two key directions: “optimizing substrate properties” and “enhancing print adaptability.” In the substrate coating stage, traditional coated papers predominantly employ a single-layer kaolin coating, which suffers from surface roughness (Ra > 1.5μm) and uneven ink absorption. This has now been upgraded to a “dual-layer coating process”: the base layer uses a calcium carbonate and binder composite coating to enhance substrate stiffness and flatness; The top layer employs an ultra-fine kaolin coating subjected to supercalendering, reducing surface roughness to Ra < 0.8μm and improving ink absorption uniformity by 30%. This enables precise color reproduction while preventing issues like “color spots” and “bleeding.” Simultaneously, coating weight achieves precise control (adjustable between 10-20g/㎡), allowing coating thickness to be tailored to different printing requirements. This adaptability supports multiple printing methods including offset, flexographic, and digital printing.

The upgraded adhesive selection further enhances sticker performance. Traditional coated paper stickers often use solvent-based pressure-sensitive adhesives, which suffer from low initial tack (prone to detachment after application) and poor temperature resistance (prone to adhesive overflow at high temperatures). and poor temperature resistance (prone to adhesive bleeding at high temperatures). The current water-based acrylic pressure-sensitive adhesive achieves an initial tack of over 10N/25mm, enabling rapid fixation after application. Its temperature tolerance range extends from -20°C to 80°C, preventing adhesive bleeding in high-temperature environments while maintaining stable adhesion in low-temperature conditions. This makes it suitable for food refrigeration labels and outdoor low-temperature applications. Additionally, for food contact applications, we have developed FDA-compliant food-grade adhesives, ensuring safety and non-toxicity when labels come into indirect contact with food.

Automated upgrades in die-cutting and slitting processes enhance production efficiency and product precision. Traditional manual die-cutting and slitting were not only inefficient (2,000 sheets per hour) but also prone to dimensional deviations. Now, fully automated rotary die-cutting machines, integrated with servo control systems, process 12,000 coated paper stickers per hour with dimensional tolerances controlled within ±0.15mm. The cut stickers feature smooth edges free of burrs. The slitting process employs high-precision slitting blades, enabling large rolls of substrate to be slit into smaller rolls of varying widths (adjustable from 10mm to 1000mm) according to customer requirements, meeting the needs of different labeling equipment.

In application domains, coated paper stickers have expanded beyond standard product labels into multiple scenarios: - Food sector: Used for biscuit and chocolate packaging labels, with food-grade materials and eco-friendly inks ensuring safety. - Gift sector: Serving as decorative stickers for gift boxes and greeting cards, where refined printing elevates gift aesthetics. - Office sector: Functioning as document labels and file classification stickers, their writable and repositionable features boost workplace efficiency. As consumer demand for “eco-friendly and refined” products grows, coated paper stickers will further optimize substrate and adhesive properties. New developments like biodegradable coated paper and repositionable coated paper stickers will drive industry upgrades.