At present, plastic hoses commonly used in cosmetic packaging mainly include aluminum-plastic composite hoses, all-plastic composite hoses and plastic co-extrusion hoses, which can meet various needs of cosmetic packaging, such as hygiene and barrier properties.
1. Aluminum-plastic composite hose
Aluminum-plastic composite hose is a kind of packaging container made of aluminum foil and plastic film through co-extrusion composite process, and then processed into a tube shape by a special tube making machine. Its typical structure is PE/PE+EAA/AL/PE +EAA/PE. The aluminum-plastic composite hose is mainly used for packaging cosmetics with high requirements on hygiene and barrier properties. The barrier layer is generally aluminum foil, and its barrier properties depend on the pinhole of the aluminum foil. With the continuous improvement of technology, the thickness of the aluminum foil barrier layer in the aluminum-plastic composite hose has been reduced from the traditional 40μm to 12μm or even 9μm, which greatly saves resources.
The aluminum-plastic composite hose has the following advantages during use.
(1) High barrier properties, aluminum foil has barrier properties such as light barrier properties, oxygen barrier properties and water barrier properties. The ingredients are diffused to the outside through the hose, thus ensuring the quality of the cosmetic.
(2) Low cost. To achieve the same barrier performance, aluminum-plastic composite hoses use less material, lower cost and better economy than all-plastic composite hoses and plastic co-extrusion hoses.
2. All-plastic composite hose
All-plastic composite hoses are all plastic components, which are divided into two types: all-plastic non-barrier composite hoses and all-plastic barrier composite hoses. All-plastic non-barrier composite hose is generally used for the packaging of low-grade fast-consuming cosmetics; all-plastic barrier composite hose is usually used for medium and low-grade cosmetic packaging due to the side seam in the tube making, and the barrier layer can be EVOH, PVDC, oxide coating. Multilayer composite materials such as PET. The typical structure of the all-plastic barrier composite hose is PE/PE/EVOH/PE/PE.
The advantages of all-plastic composite hose are as follows:
Environmentally friendly. Compared with the aluminum-plastic composite hose, the all-plastic composite hose adopts an economical and easy-to-recycle all-plastic sheet, which can reduce the pollution of packaging waste to the environment. The recycled all-plastic composite hose can be produced after reprocessing. Relatively low-end product.
(2) Diversified colors. According to the characteristics of cosmetics and different consumer needs, the all-plastic composite hose can be made into different colors, such as colorless transparent, colored transparent, colored opaque, etc., bringing consumers a strong visual enjoyment. In particular, the transparent all-plastic composite hose can clearly see the color state of the contents, giving people a strong visual impact and greatly promoting consumers' desire to buy.
(3) Good resilience: Compared with the aluminum-plastic composite hose, the all-plastic composite hose has better resilience, which ensures that after the cosmetic is squeezed, the hose can quickly return to its original shape, and always maintains a beautiful, The appearance of the rules. This is crucial for cosmetic packaging.
3. Plastic co-extrusion hose
Plastic co-extrusion hoses use co-extrusion technology to co-extrude raw materials with different properties and types together, and form at one time. Plastic co-extrusion hoses are divided into single-layer extrusion hoses and multi-layer co-extrusion hoses. The former is mainly used for fast-consuming cosmetics (such as hand creams, etc.) that have high requirements on appearance and low actual performance requirements. Packaging, the latter is mainly used for high-end cosmetic packaging.
The main advantages of plastic co-extruded hoses are as follows:
(1) Since there is no side seal, the appearance is better than that of composite hoses, which is necessary for high-end cosmetic hose packaging.
(2) According to the different extrusion die, various shapes of extrusion hoses can be produced, such as oval, square, etc., to meet the needs of different consumers.
4. Analysis of the shortcomings of various plastic hoses
The three plastic hoses for cosmetic packaging mentioned above have their own shortcomings.
(1) Due to the use of aluminum foil, the aluminum-plastic composite hose has many disadvantages, such as invisible content, poor environmental protection, poor resilience, lower composite strength than all-plastic composite hose, and easy delamination.
(2) The barrier property of the all-plastic composite hose mainly depends on the type and thickness of the barrier layer material. Taking EVOH as the barrier layer material for the all-plastic composite hose as an example, to achieve the same barrier property and stiffness, its cost It is about 20% to 30% higher than the aluminum-plastic composite hose. For a long period of time in the future, this will become the main factor restricting the full replacement of aluminum-plastic composite hoses by all-plastic composite hoses.
(3) The production and processing technology of plastic co-extruded hoses is generally made first and then printed. For the printing process, the efficiency is low, the process is complex and difficult.
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