Vulcanization is an important step in the manufacture of solid tires in which the crosslinking process occurs. In vulcanization, the materials commonly used as activators and coactivators are ZnO and stearic acid, respectively. In this research, ZnO and stearic acid were replaced with zinc stearate to improve the characteristics of vulcanized rubber. Zinc stearate was applied in four formulas with a composition of 5 to 9 phr. A formula that is often used in the rubber industry was used as a comparison, and ZnO and stearic acid of 5 phr and 2.5 phr, respectively, were applied. The rubber compound for solid tire production was developed using an open mill at a compounding temperature of 45 °C ± 5 °C. The vulcanization process of developing the rubber compound into vulcanized rubber was carried out at 150 °C for 20 min. Rubber compound test results showed that the use of zinc stearate at a ratio of 8 phr accelerated the curing time (t₉₀) between 58.3% and 69%, the scorch time (ts2) between 22.4% and 95.5%, and the torque delta (Δ_s) between 17.67 and 24.21 kg-cm. In addition, the vulcanized rubber mechanical properties test results for the compression set parameter increased between 28.6% and 57.1%. Scan results with SEM–EDS showed that using ZS could improve the homogeneous distribution of the material in the vulcanized matrix of solid tire rubber.

Synthesis of glycerol mono-laurate (GML) has been performed using esterification reaction of glycerol and lauric acid. The reaction was performed at the condition of temperature of 120–140 °C within 7 hour, variation of molar ratio of glycerol - lauric acid, and was using heterogeneous catalyst of zeolist Y. Without catalyst dealumination the maximum acid conversion was 78%, with GML contained in the sample was 38.6%, and it was obtained at the reaction condition of 140 oC, 15wt% catalyst, and 8:1 molar ratio of glycerol - lauric acid. At the same condition, using dealuminated catalyst, the maximum acid conversion was increased up to 98%, with GML contained in the sample was 50.4%. The GML antibacterial activity was examined. It was observed that the GML has antibacterial activity against gram positive bacterial such as B. cereus and S. aureus.

The National Socioeconomic Survey (SUSENAS) conducted in Indonesia in September 2021 found that the average consumption of red chili per month was 0.15 kilograms (kg) per capita per month. The average consumption of fresh chili per month is 40.90 thousand tons, and the cumulative total reached 490.83 thousand tons in 2021. Uneven chili production across time and region makes prices fluctuate, which affects inflation by 0.01–0.07%. Another problem is the imbalance of supply and demand between time and region, which impacts farmers’ welfare. Setting planting time and location and improving distribution can solve these problems. The application of technology that can extend the life of fresh chilies for one month is a solution for chili distribution from farmers to areas with high demand. One-wave roasting and drying technology can extend chilies’ freshness for six months. By producing chilies that have a shelf life of more than three months, it is possible to store them in warehouses using the warehouse receipt system. The application of the warehouse receipt system to chili commodities is also an alternative to solving postharvest problems. The distribution and application of technology that can extend the life of chili can increase its economic value and make chili not a commodity that contributes to Indonesian inflation.

Plastic packaging poses significant environmental challenges due to its resistance to natural degradation. In response, there has been a growing body of research dedicated to developing sustainable packaging alternatives, particularly those based on biodegradable materials. Biopolymer‐based packaging is widely recognized for its enhanced environmental compatibility, owing to its capacity for natural decomposition and reduced ecological footprint. This study presents a comprehensive bibliometric analysis of recent advancements in biopolymer coatings for food packaging, with a focus on their potential to enhance food safety, quality, and shelf life. Analysis of publications from 2015 to 2024 indicates a substantial and consistent rise in scholarly output related to biopolymer‐based packaging solutions, driven by global efforts to mitigate plastic waste and its associated environmental impacts. The findings suggest that the future trajectory of biodegradable packaging research should emphasize the development of materials that simultaneously support human health and environmental sustainability. Bibliometric mapping identified polylactic acid (PLA), polyhydroxyalkanoates (PHAs), chitosan, and cellulose‐based polymers as key areas of innovation, highlighting their increasing prominence and interdisciplinary research significance. These materials are notable for their biodegradability, and many also exhibit intrinsic functional properties such as antimicrobial and antioxidant activities—attributes that are highly desirable in food packaging applications. Biopolymer coatings, in particular, have demonstrated excellent barrier properties, including controlled permeability to moisture and oxygen, which are critical for maintaining food integrity. Such coatings contribute to extended shelf life by minimizing dehydration and oxidative damage while concurrently offering protection against microbial contamination. Despite the promising functional characteristics of these materials, several challenges continue to hinder their widespread adoption. Key barriers include high production costs, the limited availability of industrial composting infrastructure, and the general lack of consumer awareness regarding appropriate disposal practices. Addressing these challenges will require coordinated efforts across research, industry, and policy domains. To enable scalable implementation, future innovation must achieve critical advancements in materials science, biopolymer production efficiency, and regulatory alignment. A comprehensive, multidisciplinary approach will be essential to realize the full potential of biopolymer coatings as sustainable alternatives to conventional plastic packaging.

Palm oil-based zinc stearate synthesis process has been developed. Palm oil-based stearic acid and zinc oxide were used as material. The synthesis was performed using an oil-jacketed reactor with a capacity of 50 kg per batch. The reaction was occurring at 95⁰C with atmospheric pressure and it took place about 10 minutes. The product characteristics was powder with a white appearance, 0.0 - 0.3 % fatty acid content, 0.2 - 1% moisture content, 118 – 125⁰C melting point and 0.5 - 1.1 g/cm³ specific gravity. The product of zinc stearate was also examined on an application of rubber component production process. Effects of using the zinc stearate to characteristics of the rubber component were tested. The characteristics included elongation, hardness and tensile strength of the rubber component. Application of 5 phr of zinc stearate on rubber component formulation showed that the rubber component processed using the zinc stearate has basic characteristic that meet the standard of rubber component of American Chemical Society (ACS) 1.

Roasting is one of the essential coffee production processes, which significantly influences the quality of roasted coffee. There are many approaches for roasting, applying rotating cylinder (a standard method of the roasting process), fixed bowl, and fluidized bed method. A study of heat transfer and product characterization was conducted in a spout fluidized bed coffee roaster with a 2000-gram capacity. In this research, Temanggung Robusta Coffee beans were processed with two different operating temperature settings, performing 225°C for a low-temperature long time (LTLT) and 240°C for a high-temperature short time (HTST). At both operating temperatures, the overall heat transfer coefficient for coffee roasting was 26,63 – 92,02 W/m²K for the LTLT process and 44,85 – 139,98 W/m²K for the HTST process. The products, then, were analyzed for moisture and ash content. The results showed that a low-temperature long-time process resulted in lower moisture content. Furthermore, there was no significant difference in ash content compared to the high-temperature short-time process (HTST).