Views: 0 Author: Eva Publish Time: 2025-08-01 Origin: GUANGDONG YINGHUI NEW MATERIAL TECHNOLOGY CO., LTD.
PP (polypropylene) self-adhesive labels, as the core representative of high-performance label materials, have established a complete application ecosystem in industries such as industry, cosmetics, food, and electronics, thanks to their diversified molecular structure design and process adaptability. Their core technology system is centered around two basic materials: biaxially oriented polypropylene (BOPP) and blown polypropylene (CPP), forming a differentiated performance matrix and application scenarios.
BOPP achieves highly oriented molecular chain arrangement through the biaxial stretching process, with longitudinal tensile strength ≥ 120 MPa and transverse tensile strength ≥ 200 MPa, while maintaining a turbidity of ≤ 1.5% for optical properties. The metallized BOPP film is coated with a 3-5 nm vacuum aluminum layer, with an oxygen permeability of ≤ 0.5 cc/(m²·24h·atm), significantly extending the shelf life of food products. Surface corona treatment raises the tension to 38-40 mN/m, combined with a 0.5-1.0 μm nano-coating to enhance the adhesion of ink. CPP uses the extrusion molding process, maintaining 160℃ heat resistance and -10℃ low-temperature resistance, with a surface glossiness of ≥ 80GU, suitable for heat-sealing packaging and process protection films.
For the low surface energy characteristic of PP materials, acrylate-based adhesives achieve wide temperature range application (-40℃ to 190℃) through modification, such as the 3M™ GPT-020F peel strength reaching 13 N/cm. Bio-based adhesives, represented by starch-grafted acrylic, have a biodegradation rate > 60%, cost reduction of 15%, and comply with FDA 175.105 standards. In special scenarios, the 3M™ 300LSE series of thin double-sided tapes can achieve reliable bonding of PP substrates without primer application, with a peel force ≤ 1.5 N/25mm.
UV ink cures on the BOPP surface in ≤ 1 second, with an ink layer thickness of 1.2 - 1.5 μm. It has a resistance to 500 times of friction with a ΔE of < 3, and can be used in combination with the HP Indigo 6900 to achieve 1200dpi variable data printing. CPP materials are compatible with water-based inks, with VOCs emissions reduced by 90%. They need to be paired with silane coupling agents to enhance adhesion to 3B level. Cold gold stamping technology can achieve high-speed transfer at 150m/min on the PP surface, reducing costs by 30%; laser die-cutting accuracy is ± 0.05mm, with edge burrs ≤ 0.02mm, meeting the requirements for special-shaped labels.
In the food packaging field, BOPP metallized film (aluminum layer 3nm) combined with conductive glue (volume resistivity < 10⁻³Ω·cm) is used for electronic component labels that can withstand 260℃ reflow soldering; CPP heat-sealing film (thickness 48μm) has an initial adhesion of ≥ 14 steel ball, suitable for automated sorting. In the cosmetics industry, bright silver BOPP film (luster ≥ 80GU) is locally UV coated to enhance the texture of cosmetic labels, and is resistant to alcohol wiping 50 times without color fading; CPP protective film (thickness 30μm) is used in the mobile phone back cover manufacturing process, with significant insulation and anti-scratch properties. In the logistics field, 48μm BOPP packing tape has a peel strength of ≥ 8N/cm, suitable for - 20℃ cold chain environments.
Recycled PP (rPP) recycles waste products, with the recycled material ratio being ≥ 50%, reducing the carbon footprint by 25%, and meeting the EU EN 13432 standard; bio-based BOPP uses sugarcane residue as raw material, with a biodegradation rate exceeding 60%, and has been used in food packaging pilot projects. In terms of process innovation, water-based inks replace solvent-based inks, reducing VOC emissions from 200 ppm to below 20 ppm, and reducing the unit energy consumption of solar-powered production lines by 35%. The Eladian rPP label uses 30% post-consumer recycled material to achieve closed-loop recycling of PET base paper.
Intelligent labels integrate temperature and humidity sensors and NFC chips to monitor the food transportation environment in real time; nano-coating technology controls the surface roughness of BOPP at 0.1-0.3 μm, achieving ultra-fine graphic printing. The collaborative research and development of bio-based adhesives and degradable PP substrates promotes a reduction in the full life cycle carbon footprint by more than 40%. With the breakthrough in die-cutting speed exceeding 200m/min and the application of AI visual inspection technology, PP self-adhesive will continue to break through performance boundaries in high-end packaging and intelligent labeling fields, becoming the core carrier of sustainable packaging solutions.
