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All Journal Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Wahyu Fajar Winata
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Arts Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Social Sciences

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PEMBUATAN BIOGAS DARI LIMBAH BHO PENYAMAKAN KULIT DENGAN STARTER EFFLUENT DIGESTER AKTIF DAN CO-DIGESTION DENGAN KOTORAN SAPI Swatika Juhana; Prasetyo Hermawan; Wahyu Fajar Winata; Arini Wresta; Ika Yanti
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 19 No 2 (2020): BERKALA PENELITIAN TEKNOLOGI KULIT, SEPATU DAN PRODUK KULIT
Publisher : Politeknik ATK Yogyakarta

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ABSTRACT This research aims to utilize BHO tannery liquid waste for biogas production and to examine the effect of active digester effluent on the co-digestion of biogas production by co-digestion of BHO liquid waste and cow manure. The experiment began with an analysis of the character of the leather tanning BHO liquid waste. The biogas production is carried out in batches in an anaerobic biogas digester. The experiment was started by entering raw materials for BHO liquid waste: cow dung: active digester effluent with a ratio of D1 = 4: 2: 0; D2 = 4: 0: 2; D3 = 6: 0: 0. Observation of the addition of gas was carried out by means of a manometer to measure the increase in gas pressure produced in the digester every day until the 15th day. The results of the analysis of BHO wastewater showed high BOD and COD levels, namely 3265 mg / L and 11231.2 mg / L. The results of making biogas show increased gas pressure (gas formation) in digester D1 and D2. The result of D1 (BHO waste without starter) gas production is a lot at the beginning and then decreases. In D2 (BHO waste with the addition of starter and cow dung), it shows that gas production is formed on the 8th day with constant pressure until the 15th day and is still producing. In the D3 digester (BHO liquid waste without a starter and cow dung) no gas is formed.
UPGRADING PROCESS FINISHING GRAIN CRACKS ON COW CRUST LEATHER CORRECTED GRAIN BOX UPPER ARMY SHOES Wahyu Fajar Winata; Nabilla Indrakusuma; Nais Pinta Adetya
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 22 No 2 (2023): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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Crust-dyed leather is a product that has gone through the process of beam house operation, tanning, and post-tanning but has not gone through finishing. The purpose of this study is to overcome these problems by upgrading the finishing process to cover broken grain defects. The raw material used is rejected quality crust cowhide leather with 1 side broken grain defects. The finishing process upgrading method used to overcome this problem is buffing using 240-size sandpaper to erode broken grain parts to make them more disguised and impregnation with water, acrylic polymer (2350 RE), and penetrator (Biofin AU BK) 64). The impregnation solution can coat the cracked crust grain parts by forming new grains which have high shatter resistance properties. The results of leather testing after upgrading were carried out at the Rubber and Plastic Leather Center, Yogyakarta, obtained results that were following ISO 3379: 2015 standards, namely distension of grain at a crack of 8.60 mm and grain crack load of 467.28 N. It can be concluded that the buffing and impregnation in upgrading the finishing process can overcome the problem of cracked CGB upper army shoe grain crust cow skin and has met the burst resistance test standard ISO 3379:2015.
RE-DYEING PROCESS ON CABRETTA SHEEPSKIN GOLF GLOVES TO IMPROVE COLOR FASTNESS USING ALIPHATIC POLYAMINE DERIVATE AS FIXING AGENT Wahyu Fajar Winata; Dwi Ari Setyorini; Nur Mutia Rosiati; Fauzi Ashari
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 23 No 1 (2024): Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Publisher : Politeknik ATK Yogyakarta

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This research aims to improve the color fastness of sheep Cabrera golf gloves during the post-tanning process. The post-tanning process includes aging, sammying, shaving, wetting back, re-tanning I, neutralization I, surface dyeing, fixation I, top dyeing, fixation II, neutralization II, fatliquoring, and top fatliquoring. Fastness skin color can be repaired by reprocessing the dyeing process. The raw material used is three sheets of crust-dyed sheep cabretta article of reject quality with a thickness of 0.5-0.55 mm. The chemicals used in the research were H₂O, Foryl PKN, Ammonia, Nexopol AM, Nexopol LA, Formic Acid (FA), Busan 30WB, and Dermafix P Liquid. The post-tanning process using FC fixing material produces crust-dyed sheep cabretta articles with a high color fading, and the finished leather has low rubbing resistance. The test results on crust-dyed skin samples showed that the fading that occurred was very high in the sweat solution, indicated by the solution's color following the sample's color. Reprocessing using Dermafix P Liquid reduced color fading in the sweat solution. On finished leather, dry and wet rubbing resistance was increased to a value of 5 for dry rubbing and a value of 4 for wet rubbing after reprocessing using Dermafix P Liquid, where previously the dry fastness value was 3, and the damp fastness value was 2 in the initial sample. Based on the results obtained, it can be concluded that reprocessing by replacing fixation materials and adding other necessary ingredients can produce leather of better quality and by SNI standards.
Co-Authors Arini Wresta Dwi Ari Setyorini Fauzi Ashari IKA YANTI Nabilla Indrakusuma Nais Pinta Adetya Nur Mutia Rosiati Prasetyo Hermawan Swatika Juhana