Waste composite of "jOS" coffee waste and gauze as alternative basic material for manufacturing craft products

Abstract

The growth of coffee business in Indonesia has given rise to coffee shops in big cities, in Yogyakarta and its surroundings (2017) reaching 1,200. This number is higher than Semarang 700 and Solo only 400 shops. Yogyakarta as a student city is famous for its "jos"coffee, which is coffee infused with burning charcoal so that the sound of "jos"can rise. This city has many students, artists and younger generation who enjoy "jos"coffee. The "jos"coffee waste produced, one of which is in Pak Agus' shop, is 4-6 kg/night. The aim of this research is to use "jos"coffee grounds waste as a basic material for making composites. The research method was carried out through experiments in the laboratory by making a composite waste of coffee grounds mixed with water, gauze fiber, coconut coir fiber, alginate, glycerol and gelatin. Composite composition consisted of "jos"coffee grounds from 10, 20 and 30 grams, 120 ml water, gauze, coconut fiber, 3 grams of alginate, 2 drops of glycerol, gelatin from 2,3,4, and 5 grams. The ingredients are cooked for 5 minutes, printed and then left for 24 hours. he resulting composites were tested for tensile, tear test, flexibility tested and observed for surface texture Composites with coconut coir fibers have poor surface texture and are easily fractured so that the mechanical properties of what is tested are composites reinforced with gauze fibers. The mechanical properties of the best composites were reinforced with gauze with a composition of 20 grams of coffee and 4 grams of gelatin, the tensile strength was 15.58 kg/mm2 and the tear resistance was 11.51 kg. From the observation that the composite has a smooth surface texture and can be bent up to 1800, so that it can be formed as an alternative material for making handicraft products.