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Stop losing revenue to premature food oxidation, package delamination, or barrier failures during thermoforming. At HSQY, we engineer advanced multi-layer co-extruded films featuring EVOH (Ethylene-Vinyl Alcohol Copolymer) core technologies. Delivering an exceptional Oxygen Transmission Rate (OTR) of <1.0 cc/m²/day, our 3- to 7-layer structures (PA/EVOH/PE) are designed to drastically extend the shelf life of oxygen-sensitive foods and provide critical chemical resistance for lithium battery applications.
Backed by state-of-the-art multi-layer co-extrusion lines within our vertically integrated facilities, we guarantee precise layer-thickness distribution and superior interlayer adhesion. From high-speed thermoforming roll stocks for MAP (Modified Atmosphere Packaging) to specialized anti-electrolyte films for the新能源 (new energy) sector, HSQY provides the exact barrier architecture your production lines demand.
Humidity-Compensated Barrier Design: EVOH's barrier properties notoriously degrade in high-humidity environments. We solve this by engineering specialized outer PA/PE moisture-barrier layers that encapsulate the EVOH core, maintaining ultra-low OTR even in wet cold-chain conditions.
Uniform Core Distribution in Deep Draws: During severe thermoforming, standard EVOH layers can thin out or rupture, creating "barrier blind spots." Our advanced melt-rheology control ensures the EVOH core remains continuous and evenly distributed, guaranteeing 100% barrier integrity in deep-cavity trays.
Superior Interlayer Adhesion: Utilizing proprietary tie-layer (adhesive) resins, we completely eliminate the risk of delamination or peeling between the PA, EVOH, and PE layers during vacuum sealing, retort sterilization, or transit vibrations.
Precision Peel & Seal Engineering: We calibrate the inner PE/PP sealant layers to provide a hermetic, leak-proof bond with your specific tray substrates, while offering customizable "easy-peel" forces for premium consumer unboxing experiences.
Different shelf-life targets and mechanical stresses require precise layer configurations. Explore our specialized EVOH matrix:
High-Barrier Thermoforming Films (PA/EVOH/PE): 5- to 7-layer structures engineered for bottom webs in Form-Fill-Seal (FFS) machines. Ideal for fresh red meats, seafood, and medical device trays requiring extreme oxygen and aroma barriers.
Peelable Lidding Films: Multi-layer structures featuring specialized sealant blends that ensure a secure, leak-proof transport seal while allowing consumers to open the package smoothly without tearing the film or leaving residue.
Anti-Electrolyte & Insulation Films for Batteries: Specialized PA/EVOH composites designed for the lithium battery sector. Offering exceptional resistance to corrosive electrolytes, high puncture strength, and electrical insulation for advanced battery module wrapping and pouch protection.
*Available in custom widths, precise thicknesses (50 to 150+ microns), and tailored ethylene content levels to balance flexibility with barrier performance.
Specifying the wrong EVOH grade can lead to catastrophic shelf-life failures. Our engineers will help you define:
Ethylene Content Balancing: Selecting the exact EVOH ethylene mole percentage (typically 27% to 44%) to achieve the optimal trade-off between oxygen barrier performance and thermoforming flexibility.
Substrate Compatibility: Matching the film's outer sealant layer chemistry to your specific tray material (PP, APET, or CPET) to ensure a hermetic seal that survives pasteurization and retort processes.
Draw Ratio Calibration: Adjusting the overall gauge and EVOH core thickness percentage to prevent barrier rupture in complex, multi-compartment mold geometries.
Q1: EVOH is known to lose its barrier properties in high humidity. How does HSQY solve this?
A: It is true that EVOH's oxygen barrier degrades when it absorbs moisture. HSQY solves this through advanced multi-layer encapsulation. By utilizing high-performance Polyamide (PA) or specialized modified PE outer layers, we create a robust moisture barrier that "shields" the EVOH core from ambient humidity. This ensures the film maintains its ultra-low OTR (<1.0 cc/m²/day) even in wet cold-chain environments and high-humidity retail display cases.
Q2: Why do EVOH trays sometimes fail barrier tests after deep-draw thermoforming?
A: This occurs when the EVOH core layer thins out unevenly or ruptures at the corners during deep stretching, creating "barrier blind spots" where oxygen can penetrate. HSQY prevents this by utilizing advanced nano-layer multiplication technology and precise melt-rheology control. This ensures the EVOH core flows uniformly and remains continuous even under extreme draw ratios, guaranteeing 100% barrier integrity across the entire formed tray.
Q3: What is the difference between 3-layer, 5-layer, and 7-layer EVOH structures?
A: A 3-layer structure (e.g., PE/EVOH/PE) offers basic barrier protection but lacks mechanical strength and moisture resistance. 5- and 7-layer structures (e.g., PA/Tie/EVOH/Tie/PE) introduce Polyamide (PA) for superior puncture resistance and moisture shielding, alongside specialized tie-layers to prevent delamination during vacuum sealing or retort sterilization. We recommend 5- or 7-layer structures for premium meats, medical devices, and demanding supply chains.
Q4: Why are specialized PA/EVOH films used in lithium battery packaging?
A: While traditional battery pouches use aluminum foil, modern battery modules and insulation wrapping (like "blue films") require materials that offer extreme resistance to corrosive electrolyte leakage, high puncture strength, and electrical insulation. Our specialized PA/EVOH composites provide exceptional chemical resistance and mechanical toughness, serving as a critical secondary protective barrier for advanced new-energy battery assemblies.
Contact us today
Tel: +86-15806115291
WhatsApp: +86-15806115291
Email: sale6@hgqyplastic.com
11th floor, Huasheng Building, Zhonglou District, Changzhou City, Jiangsu Province, China, 213001
