What is composite packaging?
Composite packaging is a combination of two or more materials through one or more dry composite processes to form a composite package with a certain function. Generally can be divided into base layer, functional layer and heat seal layer. The base layer mainly plays the role of aesthetics, printing, and moisture resistance. Composite packaging bags have a wide range of uses. In addition to being widely used in the food industry, they also shine and are widely used in the pharmaceutical packaging industry.
What are the advantages of composite packaging bags?
According to the conventional structure, flexible packaging is usually distinguished by outer layer, middle layer, inner layer, adhesive layer, etc. The outer layer material is usually selected from materials with good mechanical strength, heat resistance, good printing performance, and good optical properties. The middle layer material is usually used to strengthen a certain performance of the composite structure, such as barrier properties, shading properties, fragrance retention, strength and other materials. The most critical function of the inner layer material is the sealability, and the inner layer structure directly contacts the contents. , So it is required to be non-toxic, odorless, water-resistant and oil-resistant.