There are many types of beverage packaging, mainly glass bottles, metal cans, cartons, PET bottles, etc. As a container for various refreshing beverages, its advantages and disadvantages are roughly the same. The performance requirements of the carton include: reproducibility, effective use of space, weight, etc. In addition, the carton also has a characteristic, that is, the layered structure of the carton Research has made it easy to achieve various barrier properties such as light-shielding and oxygen barrier properties.
1. Carton structure that meets quality requirements
In addition to transparency, the carton can fulfill its functional requirements through its structure and material combination. According to the shape, the representative cartons include roof box structure cartons, square cartons and cartons of other structures.
2. Regenerative
As representative cartons, there are milk cartons with roof box structure and soft drinks cartons. The cardboard used for these milk packaging is made by extruding polyethylene on the front and back sides of the cardboard using an extruder. Since paper and polyethylene are relatively easy to peel or separate in the alkaline solution, the regeneration of the paper components is easy to achieve. The recycling of milk packaging has been realized. In addition to the aforementioned factors that make paper components easy to regenerate, there is another reason that only pure pulp is actually used to produce cardboard for cartons.
3. Various barrier properties
Oxygen, water vapor and light are the causes of the deterioration of the contents of the package. In order to increase the barrier properties of the carton, one of the methods is to compound it with aluminum foil. According to this method, the carton can be equipped with the function of blocking oxygen, water vapor and light. Using aluminum foil composite carton, the contents can be stored for a long time.
4. Paper edge protection structure
Using a printing method that suits the needs of customers, printing is performed on the surface of the cardboard paper box made by the extrusion press lamination process. The main printing methods include gravure printing and offset printing. Gravure printing is used for large batches, and offset printing is used for small batches. However, sometimes the printing method is selected according to the requirements of the design. The printed cardboard is molded into the desired unfolded shape, and then through a flame sealing device, the gas flame is used to melt the polyethylene on the edges of the front and back sides of the cardboard, and the edges of the front and back sides of the cardboard are melted. Glue each other to make a carton.
5. Environmental protection
Although the use of aluminum foil provides the possibility of long-term storage of carton beverages, it will cause difficulty in recycling the original paper, and may also lead to accidents in which the aluminum foil damages the incinerator when the paper container is incinerated. By using barrier materials that replace aluminum foil, the overall requirements of environmental protection and long-term storage can be achieved. Typical alternative barrier materials such as EVO (Ethylene Vinyl Acetate Copolymer) and silicon vacuum coating.
6. Barrier
Because grape juice is easy to lose its unique taste, the important role for paper containers is to maintain the fresh taste of the contents. Apple juice will absorb the odor around it, causing its taste to change. For such content, the container is required to have the function of blocking external odors. If the aforementioned blocking material is used, it can successfully block the outside from the outside.