Physical and mechanical properties of coffee waste composites and viselin fabrics as alternative base materials for manufacturing products in the interior field

Abstract

The results of coffee plantations and the growth of coffee shop entrepreneurs in Indonesia are increasing so that coffee shops (angkringan) have sprung up in various cities. World coffee consumption averages 1.7 kg per capita per year, in Indonesia it has increased by an average of more than 7% per year with the consumption of 4.55 million bags of coffee measuring 60 kg, a growth of 1.8% until the 2018/2019 period. In the city of Yogyakarta and its surroundings there are 1,200 coffee shops in 2017, this figure is much higher than the big cities around it. Yogyakarta is famous for its “jos” coffee in a lot around the Malioboro street. As a student city, many young people also enjoy coffee and produce a lot of coffee dregs waste. For this reason, this research raises about the use of coffee dregs waste into composites with viselin fiber reinforcement based on its physical and mechanical properties as an alternative base material for making products in the interior sector. The composite composition consists of coffee dregs ranging from 10,20,30,40, and 50 gr, 120 ml water, 3 gr alginate, glycerol 2,3,4 and 5 drops, so the elements varied are coffee and glycerol. The ingredients are mixed and heated then printed measuring 10 cm × 15 cm, then aerated for 24 hours. Composite results were tested for tensile, tear test, flexibility test and observation of surface texture. The results of the composite test with the composition of 30 gr of coffee and 3 drops of glycerol have the greatest tensile strength of 34.9 kg / mm and the tear resistance of receiving a load of 30.4 kg. For physical testing, it is obtained that a smooth surface can be bent and can even be formed into a tube so that the resulting composite can be used as an alternative material for making a product, especially in the interior field.