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Barrier properties of cosmetic packaging

Views: 103     Author: Site Editor     Publish Time: 2021-09-17      Origin: Site Inquire

Packaging needs to have both protective, functional and decorative requirements. The protective function of packaging is the most basic and important function, and good barrier properties are one of the requirements for the protective function of packaging. 


The packaging materials used for cosmetics, except for glass, ceramics and metal materials that have good barrier properties, are made of polymer materials such as polyethylene (PE), regardless of whether they are blow-molded bottles or injection-molded cans, regardless of hoses or films. Polypropylene (PP), polyethylene terephthalate (PET), polyethylene-vinyl alcohol copolymer (EVOH) or physical or chemical modification of these materials are composed of materials, which are the plastics we often mention. The microstructure of plastics shows that plastic materials are not "impermeable to air". 

bottle

Observing the surface of PE and PP materials under a high-power electron microscope, we can see that there are holes in the materials, which is enough to make us realize that plastic materials themselves have certain permeability.

 

Is it necessary for us to consider the barrier properties of cosmetic packaging? The answer is yes. In fact, in the development of food packaging, the barrier property of the packaging is as important as the sealing property. It plays a role in preserving the quality, freshness, flavor and shelf life of the food. 


However, in the development of cosmetic packaging, the sealability is often emphasized while neglecting the barrier property of the package. This is why in the actual cosmetics development, cream or lotion products with good overall packaging sealability are encountered. After a period of time, it was found that the texture of the cream became thicker and thicker, and even could not be used at all; there were also some formulas containing volatile organic active substances, which slowly penetrated out through the packaging materials, resulting in the lack of corresponding active ingredients. 


Therefore, the barrier function of the packaging needs to be considered in the development of cosmetic packaging to ensure a good skin feel, preservation effect and extend the shelf life of the product.


Only by correctly understanding the definition of barrier properties and permeation mechanism of materials, and understanding the influencing factors of barrier properties of polymer materials, can we choose packaging materials with suitable barrier properties according to actual needs in the development of cosmetics packaging, so as to do well.


At present, the application of barrier packaging materials in the field of cosmetic packaging is in a period of growth. The commonly used high barrier materials in China include aluminum foil, polyvinyl alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), nylon (PA), Polyethylene terephthalate (PET), etc. Aluminum foil, PVA, and EVOH are high-barrier materials, and PA and PET have similar barrier properties and are medium-barrier materials.


For hose packaging cosmetics, if the product itself has high barrier properties, the following three types of barrier plastic hoses are usually used.

 

bottle


1. Aluminium-plastic composite hose, its typical structure is PE/PE+EAA/AL/PE+EAA/PE, which is made of aluminum foil and plastic film through co-extrusion and compounding into sheets and then pipes. The main barrier is The barrier property of aluminum foil layer mainly depends on the pinhole degree of the aluminum foil. When the thickness of the aluminum foil increases, the barrier property increases;


2. All-plastic barrier composite hose, its typical structure is PE/PE/EVOH/PE/PE, all composed of plastic, and its barrier layer is usually EVOH or oxide-plated PET. As the thickness of EVOH increases, the barrier is enhanced. 

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