The work aims to develop a low-temperature polyethylene heat-sealing film (IPE) with both high heat resistance and high tensile strength to address the issues of seal wrinkling and thermal deformation in BOPE/PE composite films during heat-sealing bag manufacturing. A heat-sealing layer was constructed using mPE/POE/LDPE ternary blend system, where molecular chain entanglement and interfacial diffusion synergistically enhanced the low-temperature heat-seal performance. The core and surface layers were reinforced with LLDPE and HDPE rigid skeleton combined with a light-transmitting masterbatch, achieving a balance of mechanical strength, heat resistance, and optical properties. Key performance indicators, including mechanical properties (tensile strength, elongation at break), optical properties (haze, light transmittance), coefficient of friction, and heat-sealing performance (seal strength, initiation temperature), were systematically investigated. The findings demonstrated that: (1) The optimized film achieved a heat-seal strength of 7.3-7.9 N/15mm at a low temperature of 90°C, fully complying with the GB/T 10004-2008 standard. (2) When laminated with a BOPE25 substrate, the BOPE/IPE composite film exhibited no surface wrinkling at 120 °C, with a defect-free sealing interface and a heat-seal strength of 10.595 N/15mm, meeting industrial requirements. (3) The film exhibited excellent processability, with a tensile strength exceeding 25.5 MPa, a stable coefficient of friction (0.05-0.2), and optical properties comparable to conventional PE films, with light transmittance of (86.73±0.46)% and haze of (12.77±1.5)%. Through multi-component synergistic modification and multi-layer structural design, this study successfully achieves the coordinated optimization of low-temperature heat-sealing performance, mechanical properties, and optical performance in PE films, providing a novel technical route for developing high-performance packaging materials. Future research could incorporate nano-SiO2 as an interfacial modifier to further improve the film’s anti-blocking properties and processing stability via surface effects and steric hindrance mechanisms.
Key words
polyethylene single material /
low-temperature heat-sealing /
three-layer co-extrusion /
multi-component synergistic modification
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