What types of films are suitable for production with a three-layer co extrusion blown film machine

The three-layer co extrusion blown film machine is an efficient and multifunctional plastic film production equipment. By simultaneously extruding and compounding three different plastic raw materials, it can produce film products with various excellent properties. Due to its unique structural design and flexible material combination, the three-layer co extrusion blown film machine is widely used in various fields such as packaging, agriculture, construction, and healthcare. The following are the main types of films suitable for production, their characteristics, and application scenarioses.

1. High performance packaging film

The three-layer co extrusion blown film machine is widely used in the packaging field, capable of producing various functional packaging films to meet the packaging needs of different products.

Food packaging film

Food packaging has high requirements for the barrier properties, hygiene, and mechanical strength of films. The three-layer co extrusion technology can achieve excellent performance by combining different materials such as PE, PP, EVOH, PA, etc

Outer layer: PE or PP is usually used to provide good mechanical strength and printing performance.

Intermediate layer: EVOH or PA can be used to provide high barrier properties, prevent oxygen and water vapor from penetrating, and extend the shelf life of food.

Inner layer: Use PE or EVA to ensure heat sealing performance and hygiene.

This type of film is commonly used for packaging meat, dairy products, snacks, and other items.

Industrial packaging film

Industrial packaging requires films with high strength, puncture resistance, and moisture resistance. Three layer co extruded film can be used to produce high-strength heavy-duty packaging film by combining HDPE, LLDPE, and adhesive resin, which is used for packaging products such as fertilizers and chemical raw materials.

stretch film 

The three-layer co extrusion technology can produce stretch films with high elasticity and self adhesiveness, usually using LLDPE as the main raw material and adding adhesive resin in the middle layer. This type of film is widely used for pallet wrapping packaging in logistics and warehousing.

2. Agricultural film

Agricultural films have high requirements for weather resistance, transparency, and insulation, and three-layer co extrusion blown film machines can meet these needs through material optimization.

greenhouse film

The three-layer co extruded greenhouse film is usually composed of the following structure:

Outer layer: Add anti ultraviolet (UV) agent to improve weather resistance.

Middle layer: EVA or functional masterbatch is used to enhance insulation and transparency.

Inner layer: Use anti fog material to prevent water droplets from condensing and affecting light transmission.

This type of film can effectively regulate the temperature and humidity inside the shed, and increase crop yield.

plastic mulch

Plastic film needs to have characteristics such as aging resistance and degradability. The three-layer co extrusion technology can produce ordinary PE film or biodegradable film (such as PLA+PBAT+starch composite material) to meet environmental protection needs.

3. Building film

The construction industry has high requirements for the waterproofing, tensile strength, and durability of thin films.

Waterproof membrane base film

The three-layer coextruded film can be used as the base material of waterproof roll. The middle layer uses high-density polyethylene (HDPE) to provide strength, and the inner and outer layers are added with anti-aging agents and adhesive layers to extend the service life.

Building protective film

Used to protect the surfaces of doors, windows, glass, etc., it is usually made of PE as the substrate, with an anti-static agent added to the middle layer and an outer layer with easy tearing properties.

4. Medical and specialty films

The medical field has strict requirements for the hygiene, antibacterial properties, and transparency of films.

Medical packaging film

The three-layer co extruded film can meet the requirements of sterility and high barrier by combining PE, PP, and special coatings, and is used for medical device and drug packaging.

breathable membrane

Used for medical protective clothing or diapers, the middle layer is made of microporous breathable material, and the inner and outer layers provide softness and waterproofness.

5. Environmentally friendly film

With the strengthening of environmental regulations, biodegradable films have become a trend. The three-layer co extrusion technology can produce the following environmentally friendly films:

Fully biodegradable film

Made by co extruding materials such as PLA, PBAT, and starch, it can be used for packaging bags, agricultural films, etc.

Recycled composite film

By co extruding recycled plastics with new materials, production costs are reduced and environmental pollution is minimized.

6. Functional film

Through material modification, the three-layer co extrusion blown film machine can produce various functional films:

Anti-static film

Used for packaging electronic components, with anti-static agents added to the middle layer.

highly transparent film

By optimizing materials (such as mLLDPE) and processes, high transparency packaging films can be produced.

Flame retardant film

Add flame retardants for wire and cable packaging or building fire-resistant materials.

The core advantage of the three-layer co extrusion blown film machine lies in its flexible material combination and performance control ability, which can meet the diverse needs of different industries for thin films. Whether it is the high barrier properties of food packaging, the weather resistance of agricultural films, or the hygiene of medical films, they can all be achieved through three-layer co extrusion technology. In the future, with the development of new materials and optimization of processes, the application areas of three-layer co extruded films will further expand, especially in the fields of environmental protection and high-end functional films.