What are the characteristics of functional co extruded films?

Main features:

1. Structural characteristics

Functional co extruded film is a composite film that uses multi-layer co extruded composite technology to combine multiple substrates with different properties. It is formed in one go and can combine the performance of various substrates

All in one, it can well meet the different functional requirements of flexible packaging. The common structures of functional co extruded films are: PE/TIE/PA/TIE/PE (PA), with moderate barrier properties,

Moderate strength; PE/TIE/EVOH/TIE/PE, with high barrier properties and moderate strength; PA/EVOH/PA/TIE/EVA, with high barrier properties and high strength.

2. Highlighting advantages

From a performance perspective, the advantages of functional co extruded films mainly include: high oxygen resistance, good moisture resistance, and good fragrance retention; Strong mechanical performance, high drop resistance, puncture resistance, and tear resistance

Good sex; High temperature resistance (121 ℃), low temperature resistance (-40 ℃), and oil resistance; Non toxic and odorless, meeting the hygiene standards for food and drug packaging; Good heat sealing, flexibility, and transparency

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From the perspective of processing technology and cost, the advantages of functional co extruded film mainly include: it is not limited by product specifications and can effectively meet the usage needs of different packaging occasions; arrangement

The more flexible the structural design, the lower the cost. For example, reducing the required performance of resin raw materials to the minimum thickness, the thinnest thickness of a single layer can reach 2-3 μ m. This can greatly reduce the cost

Less expensive resin usage; Only one blow molding process is needed to effectively reduce production costs.

Application field:

1. Composite membranes that replace partial structures

Functional co extruded films can be used to replace partially structured composite films. For example, composite films with a middle layer of PA/PE can be replaced by PA/PE co extruded films; Composite with high barrier structure

Membranes can be replaced by co extruded films containing EVOH, especially for products with high barrier requirements such as fruit juice, tomato sauce, and jelly. Functional co extruded films can be used for packaging, which can include

Effectively prevent product discoloration, odor, and other issues.

2. Used for automatic packaging machines

The common structure of functional co extruded film used in automatic packaging machines is that, firstly, matching functional co extruded film with automatic packaging machines can effectively reduce the labor intensity of manual packaging,

One automatic packaging machine can be equipped with three production personnel, which is equivalent to the labor intensity of 15-20 production personnel when using manual packaging. This not only alleviates the problem of difficult recruitment, but also

Reduced labor costs.

Secondly, functional co extruded films can be automatically filled on automatic packaging machines, effectively reducing the secondary impact of manual packaging on products with high hygiene and safety requirements such as food and drugs

Pollution.

Furthermore, functional co extruded films do not require a composite process and can effectively control the residual amount of organic solvents, providing reliable protection for the safety and environmental protection of products such as food and medicine.

3. Used as buffer packaging for electronic and electrical products

Functional co extruded film has outstanding advantages as a cushioning packaging for electronic and electrical products, with a conventional structure of PE/PE/TIE/PA/TI E/PE/PE. This type of cushioning packaging is also known as

"Inflatable packaging" requires the use of film materials that must have good mechanical properties, such as puncture resistance, compression resistance, good barrier properties, oil resistance, light avoidance, etc. This requires the use of multiple methods

Combine polymer particles with different performance to achieve.

4. Used as an infusion bag

Functional co extruded film is the main application material in the current infusion bag market, which was mainly imported in the past. However, in recent years, some domestic material manufacturers have also actively taken action, since

We have developed multiple high-performance functional co extruded films for infusion bags.

This type of functional co extruded film is made by mixing various polymer particles with special functions in a certain proportion, and these mixed particles are extruded by an extruder under suitable conditions

Granulation is produced and finally cooled by water or air cooling. During the extrusion molding process, some polymer particles also need to undergo cross-linking through radiation. This type of functional type is common

The air cleanliness level of the extrusion film production workshop must reach level 100 in order to ensure the cleanliness and sterility of the surface of the functional co extrusion film, thereby improving the physical and chemical indicators of the infusion bag

All meet medical requirements.

The advantages of functional co extruded film infusion bags are as follows:

① Under the pressure of the infusion bag, it can be emptied by self flow;

② Not only does it eliminate the pollution of backflow air, but it can also solve the problem of soft bag micro leakage; ③ In cases where automatic infusion is not possible, the infusion function can be restored through external pressure.

5. Used as a vacuum packaging bag

The packaging of aquatic products, seafood, rice and other products needs to meet the requirements of puncture resistance, drop resistance, etc. The authenticity packaging bag made of functional co extruded film can be adjusted by adjusting the polymer particles

To meet the above requirements in proportion, it has advantages that traditional composite membranes cannot match. The conventional structures include: PA/TIE/PE/TIE/PA/TIE/PE/PE (EVA), which has high strength;

PA/TIE/PE/TIE/EVOH/PE/PE/PE/PE (EVA), with high strength and high barrier properties. In the future, functional co extruded films will play a greater role in the vacuum packaging bag market.