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All Journal Journal of Applied Electrical Engineering Mitra Akademia: Jurnal Pengabdian Masyarakat Jurnal Riset Rumpun Ilmu Teknik (JURRITEK)
Rachmah Nanda Kartika
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Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Environmental Science Industrial & Manufacturing Engineering Social Sciences

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Pengaruh Level GCR dan UCR dengan Pengaturan Total Ink Limit Terhadap Penyimpangan Warna Endang Yuniarti; Rozella Jolanda; Rachmah Nanda Kartika
Journal of Applied Electrical Engineering Vol 6 No 2 (2022): JAEE, December, 2022
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jaee.v6i2.4775

Abstract

Keakuratan warna abu-abu berperan penting dalam pengendalian kualitas warna suatu cetakan. Hal ini karena warna tersebut terdiri dari warna cyan, magenta dan yellow untuk melihat karateristik warna CIEL*a*b. Kalkulasi warna abu-abu ini dapat diatur dengan metode gray component replacement (GCR) dan under color removal (UCR) pada kegiatan pracetak dengan cara mengatur level total ink limit pada printer. Maka tujuan dari penelitian ini adalah untuk mendapatkan level GCR/UCR yang memiliki ∆E a*b terkecil dengan pengaturan total ink limit dan nilai deviasi warna (∆E a*b) dengan 3 variasi pengaturan total ink limit (200%, 300%, 400%) pada target warna FOGRA 27. Hasil penelitian ini menunjukkan bahwa komposisi CMYK ink coverage level GCR/UCR menunjukkan perubahan deviasi/penyimpangan warna (∆E a*b) neutral gray (mid tone) menggunakan FOGRA 27, memperlihatkan bahwa semakin tinggi total ink coverage maka semakin banyak tinta CMYK yang digunakan. Dan nilai deviasi warna (∆E a*b) terkecil adalah GCR Medium 400% dengan nilai ∆E a*b = 3,0 dan nilai penyimpangan warna UCR terkecil sebesar 1,67.
Pelatihan Pembuatan Baju Kaos: Peningkatan Kualitas Produk dan Daya Saing UMKM D’limalima Cileungsi, Kabupaten Bogor Djonaedi, Emmidia; Rachmah Nanda Kartika; Endang Yuniarti; Hb. Rudi Kusumantoro; Yoga Putra Pratama; Moch Yana Hardiman
Mitra Akademia: Jurnal Pengabdian Masyarakat Vol 7 No 1 (2024): Mitra Akademia: Jurnal Pengabdian Masyarakat
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/mapnj.v7i1.6381

Abstract

Convection is a mass production business, and this production scale is on the small industry scale. D'LimaLima small industry is a screen printing start-up small industry that was only founded in 2023. This small industry is interested in starting a T-shirt screen printing business in various sizes. This activity was carried out by providing training in making t-shirts for 1 day. Participants who are beginners have different learning times for each person and each type of machine. The training methods that will be used include: Lecture, discussion, practice. From the observations, it was concluded that for all participants as beginners, sewing one t-shirt took more than one hour. This is caused by the lack of skills in using the three types of sewing machines (overlock, chain, double stitch). It took the three sewing trainers less than 1 hour to make one t-shirt, because they were trained and used to using industrial type sewing machines like that. On average, participants needed 10 minutes and 5 re-stitches when sewing on patchwork. so it can be confirmed that participants also need to repeat the activity more than five times to become more skilled at using the machine
Evaluasi Ketahanan Tinta UV Magenta terhadap Durasi Paparan Sinar Ultraviolet pada Media Banner Flexi Cintana Tsaltsa Syahara; Yoga Putra Pratama; Rachmah Nanda Kartika
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5455

Abstract

The color fastness of ultraviolet (UV) ink on outdoor print media is a crucial aspect that affects long-term visual quality. This study aims to evaluate the effect of varying the duration of UV exposure on the color stability of UV magenta ink applied to flexi-based banner media. The testing process was carried out experimentally through artificial irradiation, with color change analysis using the CIE Lab color system and the ΔE parameter as an indicator of degradation. The results showed that the longer the irradiation duration, the higher the ΔE value produced, which indicated significant color degradation. This finding emphasizes the importance of applying additional protection, such as UV lamination coating, to improve the color fastness of prints for outdoor use.
Pengaruh Paparan Sinar UV terhadap Ketahanan Warna Hasil Cetak DTF pada Kain Cotton 30s dan Spandek Rayon Nabila Dwi Julyanti; Emmidia Djonaedi; Rachmah Nanda Kartika
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5486

Abstract

Color fastness in Direct to Film (DTF) digital screen printing is influenced by various external factors, one of which is exposure to ultraviolet (UV) light. This study aims to evaluate the impact of UV light on the color stability of DTF prints on two types of fabric, namely 30s cotton and spandex rayon. A quantitative approach was used in this study, involving color difference testing (ΔE), washing simulations, and UV exposure. Based on the analysis results, cotton 30s demonstrated superior color fastness performance compared to spandex rayon, as indicated by lower ΔE values after UV exposure and washing processes. Conversely, spandex rayon experienced more drastic color changes, especially after being washed with bleach detergent. These findings emphasize that the selection of fabric materials and washing methods are critical factors.
Pengaruh Formulasi Tinta Ungu Organik Berbahan Dasar Ubi Ungu terhadap Ketahanan Cahaya pada Cetak Saring Subhan Zuhri Ritonga; Rachmah Nanda Kartika; Yoga Putra Pratama
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5525

Abstract

This study aims to evaluate the lightfastness of organic ink formulated from purple sweet potato (Ipomoea batatas L.) pigment for screen-printing applications on 24s cotton combed fabric. The ink formulations varied the pigment amount (10, 15, and 20 grams) and solvent volume (distilled water) of 25 and 30 mL, while the binder and thickener components were kept constant. Lightfastness was assessed by measuring the change in lightness (ΔL*) before and after 24 hours of light exposure. The results showed that the formulation containing 15 g of pigment and 25 mL of solvent (P2A1) exhibited the best colorfastness, with an average ΔL* of 0.23, while the formulation with 10 g pigment and 25 mL solvent (P1A1) showed the poorest performance (average ΔL* of 1.86). A lower solvent volume resulted in higher resistance to light exposure. Moreover, using either too little or too much pigment negatively affected ink transfer and reduced lightfastness. Two-way ANOVA on log-transformed data revealed that the interaction between pigment concentration and solvent volume had a significant effect on ΔL* (p < 0.001), contributing 72.8% to the total data variation. This study confirms that achieving an optimal balance between pigment amount and solvent volume is crucial for producing organic ink with good lightfastness
Pengaruh Penambahan TiO₂ terhadap Kemampuan Distribusi Warna Cetakan pada Kertas Komposit Berbasis Ampas Tebu Fitri Kusuma Dewi; Emmidia Djonaedi; Rachmah Nanda Kartika
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5561

Abstract

The processing of natural fibers as raw materials for paper has grown over the past few years. However, the use of composite paper as a printing substrate has several drawbacks. One of them is the low color reproduction quality of printed images on paper made from natural fibers, caused by the insufficient whiteness of the paper. This study aims to investigate the effect of titanium dioxide (TiO₂) addition on the color reproduction quality of composite paper based on sugarcane bagasse fiber. TiO₂ was varied at concentrations of 0%, 10%, and 20%. Printing process was carried out using an inkjet printer with standard CMYK and RGB color patches. After that, the printed results were measured using colorimeter with D65 illuminant. Color distribution analysis was processed using MATLAB software. The results showed that the addition of TiO₂ increased the whiteness of the paper, as indicated by the higher L* values. The color gamut visualization demonstrated that the gamut area expanded as the TiO₂ content increased. This result shows that the addition of TiO₂ affects the color reproduction quality of composite paper.
Studi Proses Produksi Tinta Gravure Violet dengan Parameter Capaian Warna Ghaitsa Zahira Adni Shaffa; Emmidia Djonaedi; Rachmah Nanda Kartika
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5572

Abstract

The production process is a crucial aspect in ink formulation, especially violet spot color inks for gravure printing applications, which cannot be accurately reproduced through conventional process printing systems (CMYK). This research aims to optimize the production parameters of violet gravure inks that often exhibit color instability due to delays in the grinding and adjusting stages. The main focus of this research is to analyze the effect of variations in grinding duration, post-grinding aging time, and the amount of raw material on ink color yield, which is evaluated based on density, CIE Lab*, and ΔE parameters. The methodology used was a descriptive experiment on a laboratory scale. The results showed that the optimal treatment combination of grinding for 90 minutes, aging for 48 hours, and the use of 400 grams of material (P3K2L4) produced the highest density value (1.858) and ΔE (0.572), indicating color stability despite quantity variations. This finding indicates that optimization of grinding and aging time contributes to the improvement of pigment dispersion homogeneity and thermal stability of the resin, even without direct measurement of the transition glass temperature (Tg) value.
Analisis Efektivitas Mesin AccurioPress 6100 dalam Produksi Cetak Digital Menggunakan Metode OEE Tentasanu Ilham Berdotu; Rachmah Nanda Kartika; Hibertus Rudi Kusmantoro
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5577

Abstract

The development of digital printing technology requires machines with high reliability and efficiency. The AccurioPress 6100 is a widely used digital printing machine that offers a speed of up to 100 pages per minute. However, the machine’s Overall Equipment Effectiveness (OEE) at PT. OctoPrint only ranged from 45% to 53%, which is below the industry standard of 85%. This study identifies the gap in machine efficiency and proposes solutions based on OEE analysis involving Availability, Performance, and Quality indicators. The study adopts a descriptive quantitative method, collecting data through direct observation and interviews over a 14-week period. Preventive maintenance strategies were implemented to improve machine performance. The results showed an increase in OEE to 60–63%, supported by improvements in Mean Time To Failure (MTTF) and reductions in Mean Time To Repair (MTTR).
Pengaruh Konsentrasi NaOH terhadap Kadar Air Kertas Berbahan Dasar Daun Mahkota Nanas Aulia Firdaus Syazidan; Emmidia Djonaedi; Rachmah Nanda Kartika
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.5624

Abstract

Agricultural waste such as pineapple crown leaves (Ananas comosus) has not been optimally utilized, despite its high cellulose fiber content, making it a potential alternative raw material for paper production. One of the main challenges in this process is controlling the paper's moisture content, as excessive water content can reduce product quality. This study aims to investigate the effect of sodium hydroxide (NaOH) concentration on the moisture content of paper made from pineapple crown leaf fibers. Three NaOH concentrations (2%, 8%, and 14%) were applied during the pulping process to remove lignin and hemicellulose, followed by gravimetric analysis of the resulting paper’s moisture content. The results showed that the 8% NaOH treatment produced the lowest moisture content of 8.35%, while the 2% NaOH treatment resulted in the highest moisture content of 10.34%. One-way ANOVA indicated that variations in NaOH concentration had a statistically significant effect on moisture content (p < 0.001). The findings revealed a non-linear relationship between NaOH concentration and moisture content, with 8% being the optimal point. A lower concentration resulted in dense fiber structures that retained water, while a higher concentration led to the formation of cellulose II, which is more hygroscopic. This study highlights the importance of optimizing NaOH concentration in paper production from agricultural waste to achieve the best quality.
Capaian Warna Tinta Berbahan Dasar Pigmen Organik terhadap Tinta Acuan Cetak Saring Konvensional Galang Aryo Jati; Rachmah Nanda Kartika; Heribertus Rudi Kusumantoro
JURAL RISET RUMPUN ILMU TEKNIK Vol. 4 No. 2 (2025): Agustus : Jurnal Riset Rumpun Ilmu Teknik
Publisher : Pusat riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v4i2.6144

Abstract

This study aims to evaluate the color of organic ink based on coffee grounds charcoal as an alternative to conventional ink in screen printing. The experimental method was conducted with three variations of pigment formulation and distilled water, namely: 15 gr & 41 ml, 20 gr & 45 ml, 25 gr & 49 ml). Testing of solid content levels and Lab values was carried out to determine color characteristics, as well as delta E calculations to compare with conventional inks. The results showed the highest solid content in the 20 g formulation, but the 15 g ink distribution produced the closest color to the reference ink due to better flow. In conclusion, proper material formulation is essential to achieve optimal color quality.
Co-Authors Aulia Firdaus Syazidan Cintana Tsaltsa Syahara Emmidia Djonaedi Emmidia Djonaedi Endang Yuniarti Fitri Kusuma Dewi Galang Aryo Jati Ghaitsa Zahira Adni Shaffa HB. Rudi Kusumantoro Heribertus Rudi Kusumantoro Hibertus Rudi Kusmantoro Moch Yana Hardiman Nabila Dwi Julyanti Priyadi Yahya Rozella Jolanda Subhan Zuhri Ritonga Tentasanu Ilham Berdotu Yoga Putra Pratama