Packaging materials determine the function of packaging, from traditional materials to today's new materials, in order to better play the function of packaging. Today, the position of composite packaging bags in the field of packaging is irreplaceable, this kind of packaging through a variety of plastic film, aluminum foil, paper and other different properties of the substrate for rolling composite processing of packaging materials, once used, it quickly replaced the traditional packaging status, the application is more and more widely.

1, the characteristics of composite packaging bags

The so-called composite packaging bag is a flexible packaging material formed by compounding more than two kinds of materials with different properties, so as to form a high-performance packaging that can give full play to the advantages of each component material. It can set the advantages of each layer of film, overcome their shortcomings, composite can obtain a more ideal packaging materials, can meet the requirements of a variety of products, with the progress of material processing technology, now the composite packaging bag variety, different performance, compared with other packaging materials, its main features are as follows:

1. Good air tightness and heat sealing;

2. Moisture-proof, anti-gas, anti-ultraviolet, heat-resistant, cold-resistant performance;

3. Good dimensional stability, stable chemical properties, excellent chemical resistance and grease resistance;

4. Tear resistance, acupuncture resistance, fatigue resistance, impact resistance, friction resistance, anti-aging property;

5. Excellent machining suitability;

6. Fine printing, good visual experience.

2, the choice of composite packaging bag substrate

The composite substrate is the main factor that determines the properties of the composite film. The choice of the composite substrate depends on the requirements of the packaging, the use of the composite material and the nature of the single-layer film. In addition, the cost of the material must be considered, and the scientific, accurate and reasonable choice must be made to meet the needs of different packaging contents. The characteristics of composite plastics are the main factors that determine the properties of composite films. The choice of composite film-based materials mainly depends on the following main factors:

1. Characteristics of composite films;

2. Characteristics of the contents;

3. The nature of the monolayer film;

4. The appropriate price of product packaging, etc.

3. Application of composite packaging bag

Composite packaging bags are mainly used for the packaging of clothing, hardware, food, medicine, cosmetics, beverages and other products. In recent years, the global demand for composite packaging bags has maintained a rapid development trend. Composite bags can be used in a wide variety of substrates. Common types of composite packaging bags are: paper/plastic composite, plastic/plastic composite, aluminum/plastic composite, etc. The number of composite substrate layers may be two, three, four, five or more. According to the type and thickness of the composite plastic film substrate, the number of layers and sequence of the combination, and the method of compounding, many types of composite packaging bags can be formed.

Having personalized packaging is also the direction that many industries need to change at present, which helps enterprises to understand the experiential consumption demand of target consumers in the general environment, find the picture scene they want to see, and combine their own brands to carry out creative packaging. The characteristics of composite bags can deeply meet the needs of enterprises.