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All Journal Journal of Energy, Mechanical, Material and Manufacturing Engineering Abdi Psikonomi
Subroto
Universitas Muhammadiyah Surakarta
Religion Humanities Economics, Econometrics & Finance Mechanical Engineering

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Effects of Lumajang sand-bentonite mix on Al-Si casting mechanical properties Edi Widodo; Rendra Dani Firmansyah; Subroto; Iis Siti Aisyah
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 8 No. 2 (2023)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v8i2.29093

Abstract

The use of sand for metal molds is often found in various places; this research will focus on the type of sand used, namely sand from Lumajang Regency, which is known to be strong for concrete mixes or the like. So the purpose of this research is to find out how Lumajang sand molds will be used as metal casting molds. Testing will be carried out by making three variations of bentonite mixtures: 10%, 15%, and 20%. Later, after knowing the tensile and compressive strengths of each sand mold, casting will be carried out with three variations. For testing, casting objects will use the dye penetration test method. So that a description of the surface smoothness of the casting objects made from the three molds will be obtained and it will be known which variation is good to know about the sand mold and the appropriate metal casting results. From the results of the research conducted, it shows that the bentonite mixture with a percentage of 20% gets the highest compressive value with a value of 26.3 N/cm2 when compared to other bentonite mixture variations. From the tensile testing results, a high tensile strength value was obtained in the 15% bentonite mixture variation with a value of 0.7 N/cm2. While the results of the dye penetrant test were obtained, the results of the variation of the sand mold mixture with 20% bentonite into a mold produced the smoothest workpiece results with a few red spots caused during testing.
Strengthening Ecoprint Batik Branding through Motif Identity and Storytelling: A Community Service Program at Zulfa Ecobay Aflit Nuryulia Praswati; Lina Agustina; Aulia Uswatun Khasanah; Subroto; Sartono Putro; Ahmad Fauzan Tirmidzi
Abdi Psikonomi Vol 7, No 1 (2026): Juni 2026
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/psikonomi.v7i1.19555

Abstract

The competitiveness of creative Micro, Small, and Medium-Sized Enterprises (MSMEs) is increasingly influenced by their ability to develop distinctive product identities that communicate cultural values. However, many ecoprint batik MSMEs still market their products without unique motif identities, philosophical meanings, or storytelling, limiting their branding potential and product differentiation. This community service program aimed to strengthen the product identity of Zulfa Ecobay, an ecoprint and natural dye batik MSMEs in Jarum Village, Klaten Regency, Indonesia, through the identification of unique ecoprint motifs and the development of motif names and storytelling. The program employed participatory training and mentoring methods involving observation of existing motifs, identification of visual characteristics based on the composition of natural leaves, participatory discussions, motif naming, and the development of philosophical narratives. The program successfully identified three distinctive motif identities, namely Wening Alas, Sekar Bumi, and Wana Sasmita, each representing different visual characteristics, local wisdom, and environmental values. The development of motif identities and storytelling enhanced the partner's ability to communicate the cultural meanings embedded in each product while strengthening product differentiation and brand authenticity. The findings demonstrate that integrating motif identification with storytelling is an effective branding strategy for creative MSMEs because it enhances product value, strengthens emotional connections with consumers, and reinforces competitiveness through cultural identity and local biodiversity. This approach can serve as a sustainable empowerment model for creative enterprises seeking to integrate local cultural heritage into product branding.
Co-Authors Aflit Nuryulia Praswati Ahmad Fauzan Tirmidzi Aulia Uswatun Khasanah Edi Widodo Iis Siti Aisyah Lina Agustina Rendra Dani Firmansyah Sartono Putro