Kerupuk merah is a type of crackers made of flour, and it isred in color. It is a type of snacks used as complementary foods, and it can add more taste and aesthetic value on the main dish. It is a unique local product. In West Sumatra, a kerupuk merah industrial center can be found in Piladang, Akabiluru District, Lima Puluh Kota Regency. The production of this cracker is still performed manually, raising major concerns with production capacity and hygiene. The capacity of kerupuk merah production is determined by the dough mixing process (the first process). This process involves the use of a rectangular wooden box and man power from 3 to 4 people for kneading. The production capacity is 500 kg of dough/day or 56–63 kg/hour. The dough mixing process is performed 1–2 times/week. The data above reflect that the production process of kerupuk merah is energy- and time-consuming, thereby reducing the quantity and quality of the production. The design of a dough mixing machine is a solution to this problem. The dough mixer drum is designed in length, width, and height of 80 cm, 80 cm, and 60 cm, respectively. The optimum capacity of the dough mixer drum in each mixing process at the speed of 27.2 rpm and mixing rate of 906.34 kg/h is 150–200 kg. The mixing machine designed is food-safe because it is made of stainless steel. This invention may increase the industrial production capacity of kerupuk merah, save the kneading time, and improve the hygiene of the production, allowing the business to be developed.
The selling price of thinly sliced young areca nut is higher than that round areca and splited areca nut, but the manual slicing process takes a long time, about 8 minutes/kg, and this process has a high risk. The young areca nut slicing machine was developed to solve the problem of manual slicing. The purpose of the research is to conduct machine design, machine testing (verification test, machine performance test, service test), and economic analysis. The young areca nut slicing machine was made and tested at the Metal Workshop and Agricultural Machine Tool Laboratory of the Payakumbuh State Agricultural Polytechnic from June to September 2021. The machine was made according to structural and functional designs. Verification tests were carried out with the aim of technically matching the data with the results of machine measurements. Parameter measurements were carried out to explain the performance of the young areca slicing machine. The parameters measured were: slicing capacity, slicing quality (average thickness and percentage of damage), specific power requirements, and power transmission efficiency. Economic analysis was carried out to explain fixed costs, variable costs, basic costs, and the break-even point. The results of the verification of the areca nut slicing machine are that with vertical type, specifications 65 x 45 x 75) cm, the driving motor is a 1 HP electric motor with a rotation speed of 1480 RPM that is transmitted through a v-belt connected to a pulley speed reducer and transmitted via a v-belt to slicer shaft. The results of the slicing capacity performance test are 50 kg/hour, slicing quality (4.2 mm thickness, and 8 percent broken percentage), the specific power requirement is 0.015 kw-hour/kg and the power transmission efficiency of 8.6%. The results of the economic analysis of the areca nut slicing machine are: fixed costs of IDR of 1,425,000/year, variable costs of IDR 11,397/hour, basic cost of IDR 239,8/kg, and the break-even point of IDR 1.845,7 kg/year. The developed areca nut slicing machine can increase the capacity, quality, and effectiveness of slicing young areca nut.
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