Paper coatings, which are functional coatings that impart qualities such as printability and glossy surfaces to paper, are also water-proof and moisture-proof, as well as grease and mould resistant.
Although paper does not have high levels of wet-strength, it has the potential to be a solid water container when coated, and can retain its waterproof qualities for a number of months, he explains.
Coating applications are used by paper-using industries including fast food stores, sectors making use of paper bags and magazines.
Food industries use coated paper to prevent food contamination and pharmaceutical companies are legally required to have mould-resistant coatings on medicine packaging.
Paper coatings made from aqueous emulsions are applied to a paper substrate surface, and act as a barrier that prevents moisture and grease from soaking into absorbent packaging materials.
The waterproof coatings used in general packaging are repulpable, compostable, biodegradable, and are food-grade compliant. Coated products have low environmental impact and harmful solvents do not evaporate owing to water-based coating chemicals.
POLYETHYLENE
Polycoated paper is imported from the US, Europe and China and large amounts of polycoated paper are produced in South Africa.
Plastic, normally made from polyethylene, is a direct derivative of crude oil, and owing to rising costs of this commodity, alternatives to using plastic or wax for paper coating have been developed to make paper waterproof.
Polyethylene coated papers, usually about 12 microns thick, have negative implications for the environment because they cannot be recycled and repulped, and high costs are incurred by the local economy from millions of dollars worth of oil imports which are turned in polyethylene.
Although paper does not have high levels of wet-strength, it has the potential to be a solid water container when coated, and can retain its waterproof qualities for a number of months, he explains.
Coating applications are used by paper-using industries including fast food stores, sectors making use of paper bags and magazines.
Food industries use coated paper to prevent food contamination and pharmaceutical companies are legally required to have mould-resistant coatings on medicine packaging.
Paper coatings made from aqueous emulsions are applied to a paper substrate surface, and act as a barrier that prevents moisture and grease from soaking into absorbent packaging materials.
The waterproof coatings used in general packaging are repulpable, compostable, biodegradable, and are food-grade compliant. Coated products have low environmental impact and harmful solvents do not evaporate owing to water-based coating chemicals.
POLYETHYLENE
Polycoated paper is imported from the US, Europe and China and large amounts of polycoated paper are produced in South Africa.
Plastic, normally made from polyethylene, is a direct derivative of crude oil, and owing to rising costs of this commodity, alternatives to using plastic or wax for paper coating have been developed to make paper waterproof.
Polyethylene coated papers, usually about 12 microns thick, have negative implications for the environment because they cannot be recycled and repulped, and high costs are incurred by the local economy from millions of dollars worth of oil imports which are turned in polyethylene.
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