Data show that by 2020, the total demand for liquid packaging cardboard will increase by about 560000 tons. During this period, the demand for dairy products and juice packaging will account for 94% of the total market. The scale of the market will increase by 0.22 billion US dollars. The expansion of the liquid packaging market will bring huge development space to the entire packaging market. When it comes to liquid packaging, the public's first impression is bottled. However, in recent years, liquid flexible packaging has been widely recognized for its unique advantages.

Liquid flexible packaging has many advantages, such as strong barrier, no peculiar smell, strong fragrance retention, easy to carry, not easy to break when falling, not squeezing and not colliding when collecting, etc. At present, it is widely used in dairy packaging, beer packaging, fruit juice, home care solution, condiment packaging and other industries.

Self-supporting zipper bag manufacturers: so custom liquid soft packaging bags need to pay attention to what?

1. choose the right material

Different materials should be used for different liquids.

For example, for liquids containing vegetable oil, do not use PE film as the inner material. Although PE film has high transparency and good air permeability, it has general permeability. PE film will swell after contacting vegetable oil. Therefore, if liquid containing vegetable oil is filled with PE film, the shelf life of liquid will be shortened.

2. more than five layers of PE film co-extrusion film more secure

PE co-extruded film is a common material for liquid flexible packaging bags. Dairy product packaging and soy sauce packaging on the market are PE co-extruded films. Ordinary PE co-extruded films can be divided into three layers and five layers. The barrier performance of the five-layer co-extruded film is higher than that of the three-layer co-extruded film. Therefore, for foods with higher safety factor, it is recommended to choose five-layer or more PE co-extruded films.

3. use of high viscosity adhesives

The higher the composite strength of the soft liquid packaging bag, the stronger the adhesion, and the less likely it is to fall off. Moreover, after the composite material is processed into a bag, it is likely to be damaged when exposed to harsh environments or affected by moisture and chemical components. Therefore, it is recommended to choose high-viscosity glue. Although this will increase the cost to a certain extent, the benefits brought by this are more objective. In addition, it is also necessary to test and analyze the quality of the composite layer after the composite is completed, such as peeling experiments, to ensure that the composite bag reaches a higher standard.

4. aluminized film can not replace metal aluminum foil

Considering the characteristics of the liquid, the liquid flexible packaging has a layer of metal aluminum foil, which plays a barrier role, but the aluminum film has high flatness, strong decoration, and certain barrier properties, so some manufacturers ask whether it can be replaced by aluminum film. Metal aluminum foil, the answer is no.

Self-supporting zipper bag manufacturer: thank you for watching, today will not do too much explanation, let's see you next time.