1. Core definition and functional integration Transport protection film is a protective material specially designed for logistics, warehousing and transportation scenarios. Its core functions include:
Surface protection: Prevent scratches, contamination, corrosion and oxidation on the product surface. For instance, PE stretch film closely adheres to items through high tensile strength and tear resistance, reducing transportation losses (which can lower the damage rate by more than 30%). Environmental isolation: Blocking water vapor, dust, and ultraviolet rays. For instance, in scenarios where containers are moisture-proof and dust-proof, stretch film is used to seal bulk goods, protecting sensitive items such as precision instruments and textiles. Mechanical fixation: Fix the goods by self-adhesive lap or winding to prevent them from collapsing or scattering during transportation. For example, when palletized goods are wrapped with 3-5 layers of winding film, stability is enhanced. Anti-theft and identification: Opaque materials (such as black film) cover the details of items, and in combination with labels, achieve visual management and improve warehouse efficiency. Special function expansion: Anti-static (for electronic packaging), UV protection (for outdoor equipment), weather resistance (for extreme environments), etc.
2. Material system and property compatibility Base material selection PE (polyethylene) : A mainstream material, it is classified into high-density, medium-density and low-density types. It is environmentally friendly, recyclable, puncture-resistant and shrinkable, and is suitable for food packaging, furniture protection, etc. PET/PP: High transparency and heat resistance (PET can withstand temperatures of 180-200℃), suitable for the protection of electronic products and optical components. PLA biodegradable material: Made from corn starch, it can degrade over 80% within 8 to 25 weeks, meeting the ISO 14855 standard and is suitable for scenarios with high environmental protection requirements. Composite materials: such as nano-reinforced PI and T-7133 resin coatings, enhance chemical corrosion resistance and UV resistance.
Coatings and adhesives Functional coatings: Anti-UV layer (blocking UVA/UVB), anti-scratch layer (nano-coating), anti-static layer (reducing damage to electronic components). Adhesives: Solvent-based/solvent-free pressure-sensitive adhesives, water-based UV adhesives, which should meet the characteristics of low residue and easy peeling, such as 180° peel strength 0.1-2.0N/25mm.
3. Processing technology and technological innovation Mainstream processes Casting/extrusion molding: Molten material is extruded through a casting machine, and then shaped by cooling rollers. The uniformity of thickness is controlled (error ≤±5%). Coating technology: Anilox roller transfer coating and micro-concave coating achieve uniform resin layer coating. UV curing energy ≥300mJ/cm², ensuring the density of the coating. Composite process: Multi-layer structures (such as base material + adhesive layer + functional layer) are pressurized and compounded through a composite wheel. After cooling, the edges are cut and wound up to enhance the interlayer bonding force. Precision slitting: Utilizing laser cutting or gradient window opening, it is compatible with fine structures such as pads and vias, avoiding peeling or poor welding.
Intelligent upgrade AI defect recognition: Recognition rate ≥99.5%, real-time monitoring of coating amount, peel force and surface defects. Online monitoring system: Controls temperature, pressure and speed parameters. For example, in the production of PE stretch film, the temperature of the oven is zoned and regulated (the low temperature in the front section extends the constant-speed drying, and the high temperature in the back section accelerates the solvent diffusion). Automated packaging: When used in conjunction with winding machines, it can increase packaging efficiency by more than 50% and is suitable for warehouse requirements of over 100 pallets per day.
4. Application scenarios and typical cases Logistics and Warehousing Pallet fixation: In e-commerce express delivery and auto parts transportation, stretch film is used to wrap boxed goods to reduce the risk of scattering. Container sealing: In maritime transportation scenarios, stretch film is used to seal bulk cargo, blocking moisture and dust and protecting precision instruments. Shelf dust-proofing: When storing raw materials and spare parts for a long time, the "well" shaped cross-winding method is adopted to enhance the sealing performance.
Production and manufacturing Semi-finished product protection: Temporary wrapping of electronic components and mechanical parts during processing to prevent scratches or oxidation. Finished product coil packaging: Surface winding of steel and aluminum coils, replacing traditional iron sheet binding, reducing costs by 50% and avoiding metal scratches.
Special industries Agriculture and food: In the preservation and transportation of fruits and vegetables (such as green peppers and grapes), the stretch film with ventilation holes is designed to extend the preservation period by 1-2 days. The frozen food box is reinforced for the second time to prevent cracking at low temperatures. Medical and art: Pre-sterilization sealing of medical catheters (medical-grade stretch film), visual management of the outer layer of anti-shock film on the surface of sculptures/paintings.
