LDPE Film: High Impact Resistance & Durability for Packaging

Low-density polyethylene (LDPE) film is a synthetic resin film made by free radical polymerization of ethylene under high pressure, hence it is also often called "high-pressure polyethylene film." Its core advantages lie in its excellent impact resistance and durability, stemming from its unique molecular structure—the molecular chains contain numerous branches of varying lengths, making the film soft, resilient, and resistant to damage from impacts, compression, or prolonged use.

Simultaneously, LDPE film also possesses good low-temperature resistance and chemical stability. Except for strong oxidizing acids, it can withstand the corrosion of most acids, alkalis, and salts, adapting to various complex usage environments, making it one of the most widely used plastic films today.

High Impact Resistance: Reliable Even at Low Temperatures

High impact resistance is a prominent feature of LDPE film. Even at temperatures as low as -70°C, it maintains excellent toughness without becoming brittle, and is not easily broken or damaged by external impacts. This characteristic makes it ideal for various packaging applications requiring damage protection.

Durability: Extended Service Life

Durability is primarily reflected in its excellent resistance to aging and long service life. After proper processing, LDPE film can effectively resist friction, stretching, and light exposure during daily use, and is not prone to aging or embrittlement. It can maintain its original performance for a long time, thereby reducing replacement frequency and costs.

Application Scenarios: Covering Multiple Areas of Packaging and Daily Life

Based on the above characteristics, LDPE film has a wide range of applications, with packaging being its primary focus.

Packaging Bags: With its high toughness and ease of processing, LDPE film can be made into packaging bags of various sizes for packaging industrial parts, daily necessities, textiles, and other products. It protects the contents from impact and contamination while facilitating transportation and storage.

Blown Film: Blow molding is an important processing method for LDPE film. Films produced through blow molding have uniform thickness and moderate transparency. They can be directly used for wrapping items, providing dust and moisture protection, or further processed into various packaging products.

Clothing Packaging: LDPE film is soft, has moderate breathability, and is not easily scratched by clothing surfaces, making it commonly used for individual packaging of clothing and knitwear. It protects clothing from dust and moisture while clearly displaying the garment's appearance for easy consumer viewing.

Food Packaging: Food packaging demands high safety and stability from its materials. LDPE film is non-toxic, tasteless, and odorless, complying with GB 4806.7-2023 "National Food Safety Standard - Plastic Materials and Products for Food Contact" (officially implemented in September 2024). Its low water vapor permeability effectively locks in freshness and extends shelf life when used in various food packaging applications.

Meat Packaging: In the specific context of meat packaging, barrier properties and low-temperature resistance are particularly stringent. LDPE film possesses excellent barrier properties and low-temperature resistance, making it suitable for packaging fresh and frozen meat.

It isolates the meat from air, preventing oxidation and spoilage, and is not easily damaged under refrigeration and freezing conditions, ensuring the freshness and safety of the meat. Related products must also meet the total migration requirements of the current US FDA regulation 21 CFR 177.1520 to ensure safe use.

Besides the industrial and food sectors, LDPE film is ubiquitous in everyday life.

Shopping bags: This is a very common application. LDPE shopping bags are strong, have good load-bearing capacity, are reusable, and suitable for retail scenarios such as supermarkets and convenience stores. With the advancement of domestic and international plastic ban and restriction policies, recyclable and biodegradable LDPE shopping bags are becoming an important development direction for the industry.

Garbage bags: Utilizing their tear-resistant and durable properties, LDPE garbage bags are widely used for garbage collection in homes, offices, and other places, effectively preventing garbage leakage and maintaining environmental cleanliness. Some thicker LDPE garbage bags can also bear heavier garbage, further improving ease of use.

Against the backdrop of advancing "dual carbon" goals and the deepening of the circular economy, the LDPE film industry is upgrading towards greening and functionalization. Currently, bio-based LDPE films have achieved commercial mass production, and the development of single-material PE films has significantly improved material recycling rates. The two core characteristics of high impact resistance and durability make LDPE films increasingly advantageous in various packaging scenarios.

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