Views: 0 Author: Eva Publish Time: 2025-06-19 Origin: GUANGDONG YINGHUI NEW MATERIAL TECHNOLOGY CO., LTD.
The BOPP label, through the dual guarantee of material properties and structural design, has constructed a full-chain food safety protection network from production to consumption. Its core advantages lie in three dimensions: chemical inertness, physical stability, and compliance.
The molecular chains of BOPP film are linear and the crystallinity is as high as 60%-70%. This tight structure gives it extremely strong chemical inertness, effectively preventing harmful substances from migrating:
Resistance to solvent penetration: When in contact with food solvents such as edible oil and alcohol, the penetration rate of BOPP is < 0.1g/m²·24h, much lower than PVC (1.2g/m²·24h). The migration test of a certain edible oil enterprise shows that after using BOPP labels, the migration amount of plasticizers in the packaging is < 0.01mg/kg, which complies with the strict limits of GB 4806.7-2016.
Resistance to acid and alkali corrosion: It remains stable within the pH range of 3-11. When in contact with acidic beverages (pH 3.5) or alkaline foods (pH 10), there is no degradation phenomenon. The migration amount of heavy metals (lead, cadmium, etc.) in the label ink is < 0.005mg/kg, and it has passed FDA 21 CFR 177.1520 food contact certification.
High-temperature stability: Under 121℃ high-pressure steam sterilization conditions (30 minutes), the molecular weight retention rate of BOPP is > 95%, without the release of small molecule degradation products, suitable for canned, sterilized milk and other food packaging that requires heat sterilization. The application verification of a dairy enterprise shows its safety in the ultra-high temperature sterilization (UHT) process.
The directional molecular structure formed by the bidirectional stretching process of the BOPP label enables it to have outstanding physical properties, capable of resisting various physical erosions in the processing, transportation and storage of food:
Wide temperature range: It can remain stable within the temperature range of -40℃ to 120℃. After being stored in frozen food (-18℃) for 12 months, the label does not undergo cracking; in the high-temperature filling beverage (85℃) production line, the shrinkage rate is < 1%, avoiding label deformation and detachment due to temperature changes.
Excellent water vapor permeability: Water vapor transmission rate (WVTR) < 3g/m²·24h (40℃/90% RH). In a high-humidity environment (such as a refrigerated warehouse), the label remains dry and stiff, the ink does not bleed, and the test of a fresh food e-commerce enterprise shows that the information clarity of BOPP labels at 95% humidity reaches 100%.
High mechanical strength: Tensile strength > 200MPa, elongation at break 150%-200%, capable of withstanding the mechanical stress of high-speed production lines and the friction and collision during logistics transportation. The production line data of a canned food enterprise shows that the damage rate of BOPP labels is < 0.05%, much lower than 3% of paper labels.
The raw materials and processing techniques of the BOPP label fully comply with the main global food safety regulations, providing a "passport" for food exports:
EU compliance: Passed the REACH regulation 197 high concern substances (SVHC) test, DEHP, DBP, etc. phthalate content < 0.1%, in line with EU 10/2011 food contact material regulations. A juice enterprise used this to smoothly enter the European market. US standard: Meets FDA food contact material certification, total migration < 10mg/dm², specific migration substances (such as caprolactam) < 0.05mg/kg. The pass rate of FDA on-site audits reached 98%.
Chinese regulations: Complies with GB 9683-1988 "Hygiene Standard for Composite Food Packaging Bags" and GB 31604.1-2015 "General Principles for Migration Tests of Food Contact Materials and Products". In the random inspection by the State Administration for Market Regulation, the qualification rate of BOPP labels has always remained above 99%.
The physical properties of BOPP labels make them ideal carriers for various high-end anti-counterfeiting technologies. Through material modification, process innovation and multi-technology integration, a difficult-to-replicate anti-counterfeiting barrier is constructed, effectively combating food counterfeiting.
BOPP film can be implanted with a unique microscopic structure during production, forming material-level anti-counterfeiting features that are difficult to imitate:
Nano texture anti-counterfeiting: Through laser interference, 50-100nm periodic textures are formed on the surface of BOPP, presenting a unique iridescent effect at a specific angle. This structure requires a high-precision lithography machine (error < 1nm) to fabricate, with the imitation cost reaching tens of millions of yuan. After being applied by a high-end liquor brand, the identification rate of counterfeit products increased to 99.7%.
Fluorescent fiber doping: 0.01% of rare earth fluorescent fibers (diameter 5μm) are mixed into BOPP raw materials, presenting specific wavelengths of fluorescence (such as 540nm green) under a 365nm ultraviolet light. The fiber distribution is random, like a "material fingerprint", and can be precisely identified through a microscope. A certain infant milk powder enterprise used this to investigate and shut down 12 counterfeiting dens.
Temperature-sensitive material composite: Reversible temperature-sensitive microcapsules (particle size 3-5μm) are embedded in BOPP film. It turns red above 25℃ and becomes colorless below 20℃. The formula of this material belongs to the enterprise's trade secret and requires precise control of the wall thickness of the microcapsules (1μm) to achieve stable performance, effectively preventing batch counterfeiting.
The high-precision processing technology of BOPP labels itself constitutes an anti-counterfeiting barrier, which is difficult for small factories to reach:
Microtext printing: Utilizing the smooth surface of BOPP film (roughness Ra < 0.1μm), 0.1mm microtext is printed using electronic engraving intaglio technology under a 10x magnifying glass, which is clearly distinguishable. This process requires the printing machine's registration accuracy < 0.01mm. Only less than 20 printing factories worldwide can reach this standard. After being applied by a certain health supplement enterprise, the imitation rate decreased by 85%.
Laser holographic stamping: 1200dpi laser holographic patterns are stamped on the surface of BOPP. The 3D dynamic effect is achieved through the calculation of holographic technology. Special holographic masters (production cost over 1 million yuan) and high-precision stamping equipment (pressure error < 0.1N) are required. A market survey by a certain seasoning enterprise showed that products with holographic anti-counterfeiting had a 32% increase in consumer trust.
In-mold label technology: BOPP labels and containers are integrated in the injection molding process, with the edge of the label seamlessly merging with the container (gap < 0.05mm). This process requires special molds and synchronous control systems. Counterfeiters cannot achieve it. After being adopted by a bottled water enterprise, the phenomenon of counterfeiting empty bottles was basically eliminated.
BOPP labels can seamlessly integrate with digital technology, forming a dual anti-counterfeiting system of "physical label + digital identity":
Invisible QR code: A hidden QR code is printed in the UV coating of the BOPP label (visible only under 980nm infrared light), containing the unique ID of the product and blockchain verification information. Consumers can verify the authenticity through a dedicated APP. After a meat company applied this technology, the product traceability efficiency increased by 90%.
NFC chip integration: A 0.1mm thick NFC chip is embedded in the BOPP label, with a storage capacity of 4KB. It can record data such as production batches and logistics information. The reading and writing distance is less than 5cm, and the encryption algorithm uses AES-256, making it extremely difficult to crack. An imported wine brand used this technology to achieve full traceability for each bottle of wine.
Physical - digital binding: Through laser marking on the BOPP label to form a randomly generated physical texture, while digitizing the texture features and storing them in the cloud, the verification is done through image recognition comparison. The misidentification rate is less than 0.001%. The test of an organic food brand showed that this technology reduced the anti-counterfeiting verification time to 3 seconds.
Through continuous material modification and process optimization, BOPP labels have broken through traditional performance boundaries and meet the diverse needs of food packaging. The innovation direction mainly focuses on three areas: functionalization, lightweighting, and sustainability.
Through molecular design and additive modification, BOPP labels can achieve various special functions to meet the packaging needs of different foods:
Anti-fog BOPP: A 0.5μm thick hydrophilic coating (containing polyethylene glycol) is applied to the film surface, increasing the surface tension to 42mN/m, and no fogging occurs in the refrigerated environment, with a transmittance of > 90% for the product. After application by a yogurt enterprise, the product display effect improved, and the shelf sales increased by 18%.
Smooth BOPP: 0.1% silica microspheres (particle size 2μm) are added to make the film friction coefficient drop to 0.2. It does not stick together in the high-speed labeling production line (300 bottles/minute), with a labeling qualification rate of 99.9%, and the production efficiency of a carbonated beverage enterprise thus increased by 20%.
Barrier BOPP: By vapor deposition of a 50nm aluminum layer, the oxygen transmission rate (OTR) is reduced to < 0.1cm³/m²·24h, combined with an oil-resistant coating, suitable for frying food packaging. The shelf life of a potato chip brand thus extended to 12 months.
While ensuring performance, the thickness of BOPP labels is continuously reduced to achieve material savings and processing efficiency improvement:
Ultra-thin BOPP: Through optimized stretching process, the film thickness is reduced from the traditional 25μm to 12μm, with the tensile strength still remaining > 180MPa, reducing material consumption by 52% per square meter. A noodle enterprise thus saved packaging costs of 3 million yuan per year.
High-strength adhesive: Using nanomaterial toughening technology, the adhesive layer thickness is reduced from 15μm to 8μm, with the peel force remaining 3N/25mm, and the initial adhesion force on the PET bottle surface reaching 8N/25mm, meeting the requirements of high-speed labeling. The material utilization rate is increased by 47%.
Film composite optimization: Using a "12μm BOPP + 5μm EVOH" composite structure, replacing the traditional "25μm BOPP + 10μm aluminum foil", the barrier performance is comparable but the weight is reduced by 58%, and the transportation cost of a sauce enterprise decreased by 15%.
BOPP labels achieve sustainable development goals through material recycling and bio-based substitution, responding to global environmental protection requirements:
Chemical recycling technology: Waste BOPP labels can be converted into propylene monomers through pyrolysis (at 450°C in a nitrogen atmosphere), with a recovery rate of 92%. The re-polymerized BOPP has the same performance as the original material (the difference in tensile strength is less than 5%), and a beverage group has established a closed-loop recycling system, handling 5,000 tons of waste labels annually.
Bio-based BOPP: BOPP films made from 30% bio-based propylene (derived from sugar cane) have a 28% reduction in carbon footprint. They have obtained the ISCC sustainable material certification and were applied by an organic food brand, resulting in a 1-level improvement in ESG rating.
Biodegradable modification: Mixing 20% PBAT in BOPP, by regulating the distribution of molecular chains, the material can degrade by 60% in industrial compost conditions within 180 days, while maintaining stability during use, solving the environmental problems of disposable labels.
