SoarnoL DC3203RB combines the high gas barrier properties, oil resistance, and transparency of ethylene alcohol with the moisture resistance and melt extrusion processability of ethylene. Furthermore, since Soarnol is composed only of carbon, oxygen, and hydrogen, it does not produce toxic gases when burned, and the heat generated during combustion is only half that of polyethylene, making it a low-load raw material.
SoarnoL DC3203RB (EVOH EW-3201) Performance Characteristics:
Excellent Gas Barrier Properties: It provides excellent barrier properties against gases such as oxygen and carbon dioxide, effectively preventing food and pharmaceuticals from spoiling or developing off-flavors due to oxygen penetration, thus extending the product's shelf life. For example, in food packaging, packaging containing this material can extend the shelf life and aroma retention of food by months or even years without the addition of preservatives.
Excellent processing performance: Combining the processability of ethylene polymers with the barrier properties of vinyl alcohol polymers, it can be thermoformed using traditional polyolefin processing equipment, such as extrusion, blow molding, and injection molding, easily producing various packaging containers, films, and other products.
Excellent oil and organic solvent resistance: Exhibits strong stability when in contact with oils and various organic solvents, with minimal weight gain and is not easily dissolved or swollen, making it suitable for packaging oily foods, cosmetics, pharmaceuticals, and products containing chemical solvents.
High mechanical strength and good abrasion resistance: Possesses high tensile strength, flexural strength, and impact strength, along with high surface hardness and good abrasion resistance. Packaging materials made from this material are not easily damaged during transportation, storage, and use, protecting the integrity of the contents.
Good transparency and gloss: Film products have high gloss and low haze, and are highly transparent, allowing the product inside the packaging to be clearly seen, enhancing the product's display effect and attracting consumers.
Good thermal stability: It is one of the most thermally stable resins among all commercially available strong barrier resins. Waste generated during processing can be recycled and reused, reducing production costs and meeting environmental protection requirements.
Meets environmental protection requirements: It is non-toxic and odorless, and will not produce harmful substances upon direct contact with food, medicine, etc., making it safe for human health and the environment. Furthermore, multi-layer packaging materials containing Soarnol EVOH (Ethylene-VinylAlcohol Copolymer) can be recycled under certain conditions, helping to reduce waste pollution.
When used as a high-barrier material, EVOH is typically employed in a multi-layer composite structure. Typical structures include:
Low-density polyethylene/ethylene-vinyl alcohol copolymer/low-density polyethylene
PP/AD/EVOH/AD/LDPE
PP/PA/EVOH/PA/AD/PE
PE/AD/PA/EVOH/PA/AD/PE
PA/EVOH/PA/AD/PE
In these structures, AD represents the adhesive. The multi-layer composite structure fully utilizes the properties of each material, improving the water resistance of EVOH and resulting in a high-barrier material with excellent overall performance. Most of the above structures are used in flexible packaging. Composite resins such as PP, PE, and PA, due to their good toughness but poor rigidity, are difficult to cut, limiting their application in rigid packaging, especially in online filling products. Impact-resistant high-barrier polystyrene (HIPS) possesses good rigidity, excellent molding performance, and is easy to punch, making it suitable for rigid packaging materials.
However, due to the poor compatibility between EVOH resin and HIPS resin, and the significant difference in their rheological rates, key issues affecting the performance and use of the composite material include the adhesion strength between the substrate and EVOH, the tensile properties of EVOH during secondary molding, and the uniformity of EVOH layer distribution during calendering of composite sheets. These are also challenges that need to be addressed in the production of this type of composite material. Domestic production has been difficult, necessitating imports, which significantly restricts cost and delivery time. Therefore, the development of high-barrier EVOH composite materials suitable for rigid packaging, especially for online filling, is particularly urgent.
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