CO Extruded Stretch Film

1. Product introduction

In today's rapidly developing industrial and consumer markets, the innovation and application of packaging materials has become an important means to enhance product value, protect product quality and meet environmental protection requirements. Co-extruded stretch film, as a high-performance packaging film, is gradually becoming the preferred solution for many industries. In this paper, the product characteristics, application fields and the influence on modern packaging industry of coextruded stretch film will be deeply discussed. Co-extruded stretch film is a kind of high performance film made by co-extruding multiple layers of different materials. This process allows multiple materials to be extruded at the same time on the same production line, each of which can exert its unique performance advantages to create a composite film with comprehensive properties. Coextruded stretch films are typically composed of a substrate layer, an adhesive layer, and a functional layer, each carefully designed to meet specific packaging needs.

2. Main features

Excellent mechanical properties: The co-extruded stretch film has excellent tensile strength and puncture resistance, which can effectively prevent packaging damage and protect the contents from damage. In addition, it also has good elasticity and toughness, and can withstand various stresses during transportation and storage.

Excellent barrier performance: by choosing the right combination of materials, co-extruded stretch film can achieve effective barrier of oxygen, moisture, aroma and odor, etc., extend the shelf life of the product, especially suitable for food, medicine and other products with high preservation requirements.

Highly transparent: The co-extruded stretch film has extremely high transparency, making the packaged product clearly visible and easy to identify and manage. This not only improves the display effect of the goods, but also facilitates the choice of products for consumers.

Good heat sealing performance: The co-extruded stretch film has excellent heat sealing performance, which can achieve fast and uniform sealing over a wide temperature range to ensure the sealing and integrity of the package.

Environmental characteristics: The material of the co-extruded stretch film meets the requirements of environmental protection, can be recycled, and reduces the impact on the environment. In addition, due to its excellent barrier properties, the use of plastic materials can be reduced, further reducing the carbon footprint.

3. FAQ

What is a co-extruded stretch film?

Co-extruded stretch film is a kind of film made by co-extruding two or more different polymer materials at the same time. This technology can precisely control the thickness and distribution of each layer of material, so that the film has a variety of performance advantages, such as barrier properties, tensile properties, etc., to meet different application needs.

How many layers of co-extruded stretch film are there?

The number of layers of the co-extruded stretch film can be changed according to specific needs, and there are three layers, five layers, seven layers or even nine layers. The more layers, the more accurately the properties of the film can be adjusted, for example, the multi-layer structure can be set in different layers, such as barrier layer, tensile layer and other functional layers.

What is the role of each layer in the co-extruded stretch film?

In general, the innermost layer may be responsible for the heat sealing performance to ensure a good sealing effect, such as polyethylene (PE) is often used in the inner layer, which has a good heat sealing property. The intermediate layer may be a barrier layer, such as ethylene-vinyl alcohol copolymer (EVOH) or polyvinylidene chloride (PVDC), which is used to block oxygen, water vapor, etc. The outermost layer has abrasion resistance and puncture resistance, such as polypropylene (PP), to protect the film from physical damage during use.

What is the tensile property of co-extruded tensile film?

The co-extruded tensile film has good tensile properties. It can be stretched within a certain range without breaking, and can closely fit the shape of the packaged item, reducing the gap in the package. Its tensile strength and elongation at break depend on the selected material and the structural design of each layer. For example, the addition of linear low-density polyethylene (LLDPE) can improve the tensile strength of the stretched film.

How good is its barrier performance?

The barrier property of co-extruded tensile film is one of its important advantages. For gas barrier, such as oxygen, carbon dioxide, etc., the intermediate barrier layer material can effectively reduce the transmittance of the gas. In terms of water vapor barrier, it can prevent external water vapor from entering the inside of the package or the water vapor loss in the package, which is very critical to maintaining the quality of the packaged goods, such as preventing food moisture in food packaging or preventing moisture damage in the packaging of electronic components.

How transparent is the co-extruded stretch film?

The transparency of the co-extruded stretch film varies depending on the material and structure. Some co-extruded stretch films use polymer materials with good transparency, and can achieve high transparency by optimizing the interface of each layer and other processes. For example, when a specific grade of polyethylene or polypropylene material is used, a fairly transparent film can be obtained, which is very advantageous for products that need to display the contents of the package, such as food, daily necessities, etc.

How is the co-extruded stretch film produced?

The co-extruded stretch film is produced by a co-extruder. Different polymer materials are heated separately to a molten state and then extruded simultaneously through a special mold to form a film with a multilayer structure. In the production process, it is necessary to accurately control the extrusion speed, temperature, pressure and other parameters of each layer of material to ensure the uniform thickness of each layer and the overall quality of the film.

What factors affect the production of co-extruded stretch film?

The quality of the raw material is an important factor, and different brands or batches of polymer materials may affect the performance of the film. The accuracy and stability of the production equipment will also affect the quality of the co-extruded stretch film, such as the temperature control accuracy of the extruder and the accuracy of the mold. In addition, the temperature and humidity of the production environment may also have a certain impact on the production process and the final product.