Current paper cups solutions have three main problems, what they are made of, how many there are and where they end up. Paper cups are made of papers and theoretically they are technically recyclable, but inside it is a layer of PE plastic which make them waterproof and able to hold the drink. This PE layer means that they cannot be recycled with conventional recycling facilities and have to be taken to specialized centres. This makes that only 1 in 400 is currently recycled, ending the rest in landfills or into the sea. When disposal the cups have the potential to release methane and chemical leaks. All this features together make paper cups a good example of the single-use plastic problem: their life span is only as long as it takes to drink a coffee but it will take hundreds of years to disappear, ending up in landfills and in the oceans, breaking into smaller pieces and causing damage on land an in the sea.
The proposed solution is UCUP, a paper cup coated with a bio-based, biodegradable and recyclable waterproof coating as an alternative to conventional layers. This layer is based on a cross-linked alginate coating, alginate is a natural polysaccharide which is extracted from brown seaweed. The main objectives are to turn this solution into an alternative to current paper cups, making them biodegradable and sustainable and reducing the plastic waste generated by the current PE layer of the cups.