This research aims to analyze the performance of the batik ironing machine (calendering) towards ensuring optimal finishing due to the problems associated with the inability to measure the mechanical system of its roll which normally leads to the unevenness of the products. Finishing is an important process in batik production and this is commonly achieved through the calendering machine which is known as one of the mechanical refinements involving a rolling process conducted using high temperatures and pressures to produce fabric products with a flat, smooth, and shiny surface and also create a smooth, moire, and an embossed effect. It is, however, important to note that operators in the batik industry are currently being faced with the problems of finishing and this means there is a need for the appropriate tool for refinement of the fabric. Therefore, this observational study was conducted with the focus on identifying the main components and calculating the mechanical strength of the calendering machine in the batik industry. This involved using the solid work software and the results showed that the calendering machine generally consists of five rolls divided into three metal and two soft rolls. The metal roll has a smooth surface with a hole in the middle for heating which implies it functions as the ironing tool while the soft roll serves as a pressure booster during the ironing process. Moreover, the analysis of structural mechanics showed that the machine has the ability to iron 3.53 meters of fabric in 1 minute. It was also observed that it has six main parts which are the preparation, roller calendar, engine frame, transmission system, boiler engine, and special cooling. The machine was able to produce a batik fabric with a flat, smooth, and shiny surface, thereby, increasing its quality

<p class="abstrak">Solar energy is one of the most impactful renewable energy sources and has great potential compared to other energy sources. The use of solar energy can be maximized by using solar panel technology and solar collectors. One example is a solar water heater. Polycarbonate is a good material to be applied to solar water heaters because it has good mechanical properties and is corrosion resistant. This study aims to analyze the performance of a polycarbonate solar water heater with a trickle system using a flow rate of 2 l/m. This type of research is quantitative with experimental research methods. This research was conducted by flowing water through a solar water heater and taking data from 08.00-15.00 with 3 repetitions to obtain accurate results. Data were collected by recording the temperature at the inlet, outlet, collector, top collector, environment, intensity of solar radiation, and wind speed. The data obtained were analyzed to find collector efficiency, fluid efficiency and total efficiency. Based on the research results, this solar water heater is capable of producing water temperatures up to 40.5°C with temperature changes of up to 7.2°C. This solar water heater is able to produce a collector efficiency of up to 52%, and a total efficiency of 37%.<em></em></p>