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All Journal Majalah Kulit, Karet, dan Plastik Prosiding SNTTM
Sugeng Supriadi
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering

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Pengaruh kecepatan drum proses terhadap sifat fisik kulit kambing untuk sarung tangan golf Sugeng Supriadi; Eddy Purnomo; Meiyanti Meiyanti
Majalah Kulit, Karet, dan Plastik Vol 12, No 25 (1998): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (912.92 KB) | DOI: 10.20543/mkkp.v12i25.357

Abstract

Fifteen pieces of wet blue were devided into three groups of equal number of pieces. All of the group were processed into glove leather with drum rotational speed of 15 RPM and 25 RPM resfectively. Analysis of varians showed that the speed effected the tensile strength, tensile stretch, elongation, and tear strength of the leather obtained. The leather processed at 25 RPM gave the highest tensile strength (138,56 kg/cm2) tensile stretch (29,30 mm), elongation (58,60%), and tear strength (30,53 kh/cm).   INTISARI Penelitian ini bertujuan untuk mengetahui pengaruh kecepatan drum terhadap sifat fisik kulit sarung tangan. Lima belas lembar kulit wet blue dibagi menjadi tiga kelompok yang sama jumlahnya. Masing-masing kelompok diproses menjadi kulit sarung tangan dengan variasi kecepatan drum 15 RPM, 20 RPM, dan 25 RPM. Analisa variansi menunjukkan terdapat perbedaan nyata diantara perlakuan terhadap kekuatan tarik, pertambahan mulur, persen pertambahan mulur dan ketahanan sobek. Hasil penelitian menunjukkan bahwa kulit yangdiputar dengan kecepatan 25 RPM memberikan nilai rata-rata tertinggi pada kekuatan tarik, pertambahan mulur, persen pertambahan mulur, dan ketahanan sobek masing-masing sebesar 138,56 kg/cm2, 29,30 mm, 58,60 % dan 30,53 kg/cm
Investigation of chessboard scanning strategy in selective laser melting of ti6al4v Amirah Salsabila Widad Putri; Sugeng Supriadi; Bambang Suharno
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/j8jemj90

Abstract

Selective Laser Melting (SLM) is recognized as a technology capable of producing metallic components with advantages in geometric flexibility and consistency of mechanical properties. mong the various alloys processed through SLM, titanium alloy Ti6Al4V is particularly attractive due to its superior strength-to-weight ratio, corrosion resistance, and thermal stability. Nevertheless, the quality of as-SLM Ti6Al4V parts is strongly affected by the selection of process parameters. In particular, the laser scanning strategy plays a decisive role in governing energy distribution, thermal gradients, and subsequent microstructural evolution during fabrication. One of the scanning approaches, the chessboard strategy, has gained significant attention because it subdivides the building area into smaller islands that are scanned alternately, reducing scan length and promoting more uniform heat distribution. This study investigates the application of the chessboard strategy in fabricating cylindrical Ti6Al4V specimens, with process maintained constantly. The fabricated geometry exhibited good agreement with the original design, confirming the capability of SLM to reproduce complex features under controlled conditions. Surface characterization revealed protrusions on the top surface (upskin), attributed to excess energy accumulation at the end of scan tracks, while fine wavy-bulgy patterns were observed on the lateral surfaces due to overlapping melt pools and re-solidified particles. The measured average surface roughness (Ra) was 4.275 ± 0.655 µm, falling within an acceptable range for SLM-fabricated components. In addition, scanning electron microscopy (SEM) analysis revealed the presence of lack-of-fusion porosity, indicating localized imperfections in powder melting and consolidation. Overall, the findings highlight that the chessboard scanning strategy not only influences thermal distribution but also directly affects surface morphology and porosity characteristics, providing essential insights for optimizing as-SLM Ti6Al4V.
Co-Authors Amirah Salsabila Widad Putri Bambang Suharno Eddy Purnomo Meiyanti Meiyanti