1)Polyethylene (PE) Film:

  PE film is one of the most commonly used base materials in flexible packaging. Classified by density,

it includes Low-Density Polyethylene (LDPE), Linear Low-Density Polyethylene (LLDPE),

and High-Density Polyethylene (HDPE). Among them, LDPE and LLDPE are more frequently

used in printing layers or composite layers.  

Advantages:    - Low cost with sufficient raw material supply, offering high cost performance;    - Excellent flexibility, strong impact resistance, and resistance to tearing;    - Good chemical stability, acid and alkali resistance, suitable for packaging products with low corrosiveness;    - Superior heat-sealing performance, easy to composite with other materials (such as aluminum foil and PET) to form sealed packaging.  

Disadvantages:    - Low surface tension, requiring corona treatment before printing; otherwise, ink adhesion is poor,

    leading to easy ink peeling;    - Poor temperature resistance (generally ≤60°C), prone to deformation at high temperatures;    - Weak barrier properties (poor resistance to oxygen and moisture),

    making it difficult to meet high freshness preservation needs when used alone;    - Moderate transparency and lower gloss compared to PET and OPP.  

Applicable Scenarios:      Snack packaging (e.g., composite outer layer of puffed food bags), daily necessities packaging

(e.g., washing powder bags), and low-temperature refrigerated product packaging (e.g., inner lining of frozen food).