High barrier bottles are attracting attention with the rapid development of the food, beverage, beer, and pharmaceutical packaging industries. There are many ways to achieve barrier properties, such as internal and external surface coatings, material blending, and multilayer bottle molding. Among them, multi-layer bottle molding technology is receiving more and more attention.
For multilayer bottles, good barrier properties generally depend on the performance of the barrier layer. PEN, EVOH, nylon, etc. are commonly used as barrier layers in multilayer bottles. Different barrier materials have different properties and cost prices vary. For example, PEN has excellent barrier properties, but costs too much. Therefore, high barrier nylon and EVOH have become the most important choices for various multilayer barrier packages. However, the general nylon material and EVOH will cause the barrier property to decline after moisture absorption, and even lose the barrier property. Generally, it cannot be directly contacted with air or inner packaging, but can only be used as an intermediate barrier layer of a multilayer bottle, and the hygroscopicity is used. Smaller polyolefin materials such as PP and PE are used as the outer layer material.
Recently, EMS introduced a new structure of multi-layer bottles with a barrier layer that can be directly in contact with the packaging. The barrier material is a new high-restriction nylon Grivory G21 from EMS.
Grivory G21 is an amorphous semi-aromatic nylon material developed by EMS-GRIVORY. This structured nylon material has excellent barrier properties for many components such as oils, waxes, solvents, fragrances, alcohol, and various vitamins. This material has passed FDA certification and can be safely in contact with food, medicines, beverages, etc. Therefore, it can be widely used in various fields requiring high barrier packaging, such as food, beverage, beer, cosmetics and other industries.
Due to the unique barrier properties of the product, plastic bottles blown with this product can be used instead of 6-layer composite EVOH barrier bottles, with significant cost advantages. This product can not only be used for food, beverage packaging, but also for a variety of chemicals, pharmaceuticals, cosmetics and other packaging. Unlike general multi-layer bottles, Grivory G21 is usually used as the innermost layer of the package, directly in contact with the package. Its bottle structure is generally 4 layers. The outermost layer is a polyolefin layer and the middle is a return layer and a bonding layer, respectively.
Oxygen barrier performance is the key to food barrier packaging. Grivory G21 is superior to EVOH in terms of moisture absorption and temperature impact on barrier properties. The barrier properties of Grivory G21 are better with increasing humidity, which is one of the important factors that can directly contact with the contents.
In addition to good barrier properties, this product also has good oxygen absorption properties, and because the product itself is odor neutral, it does not affect the taste of the package. In a typical six-layer package, the content must be separated from the barrier by means of a polyolefin material.
Good UV barrier properties are another advantage. Grivory G21 has UV resistance up to 300nm and can be used to process transparent bottles with UV resistance of 300nm.
Grivory G21 can not only be used as a barrier material for multi-layer co-extruded bottles, but also successfully applied in various composite barrier films and other fields requiring high barrier packaging.