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All Journal Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Swatika Juhana
Jurusan Teknologi Pengolahan Kulit, Politeknik ATK, Yogyakarta
Arts Chemical Engineering, Chemistry & Bioengineering Engineering Industrial & Manufacturing Engineering Social Sciences

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KARAKTER FISIK KULIT DOMBA SAMAK KOMBINASI DENGAN BAHAN PENYAMAK ALUMUNIUM-MIMOSA Swatika Juhana; Tutik Maryati; Wahyu Fajar Winata
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 19 No 1 (2020): BERKALA PENELITIAN TEKNOLOGI KULIT, SEPATU DAN PRODUK KULIT
Publisher : Politeknik ATK Yogyakarta

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Abstract

Sheep skin tanning has been carried out using a combination tanning material, namely 4% Aluminum and 6% Mimosa. Raw materials in the form of raw sheep skin weighing 2 kg. BHO, tanning, and post tanning processes are carried out to produce crust skin. The physical test characteristics are 0.7 mm thickness, 6 mm softness, 27.8 N/mm2 transverse tensile strength, 17.8 N/mm2 longitudinal tensile strength, 48.5 % transverse elongation, 45.8 % longitudinal elongation, 19.1 N/mm2 transverse tear strength, 18.9 N/mm2 longitudinal tear strength, and shrinkage temperature (Ts) 89oC. The physical test results were compared with the SNI 4593-2011 standard for sheep leather jackets. The results meet the SNI for sheep leather jackets.
STUDI SURFACE COATING DAN KARAKTER FISIS LAPIS TIPIS NANO PARTIKEL TiO2 PADA KULIT FINISH Prasetyo Hermawan; Swatika Juhana
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 19 No 1 (2020): BERKALA PENELITIAN TEKNOLOGI KULIT, SEPATU DAN PRODUK KULIT
Publisher : Politeknik ATK Yogyakarta

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Abstract

Influence of variation; type of film material, number of film layers and concentration of TiO2. The purpose of this research was to study of variations; type of film materials, number of film layers and concentration of TiO2 on goat skin finish. The variation in the number of layers are; 0, 1, 2 and 3 layers, while variations in the concentration of TiO2 are; 0%, 0.5%, 1%, 1.5% and 2%. Films are made using polymers from water soluble nitrocellulose (NC-W), water soluble polyurethane (PU-W) and thinner soluble polyurethane (PU-T). Furthermore, testing of the physical characteristics of the skin includes; weight, thickness, softness, hardness and contact angle. In the variation of the number of film layers from zero to three layers, the largest increase in skin weight occurred in the use of PU-T, namely 0.47 gr and the smallest in NC-W of 0.28 gr. The increase in thickness also occurred at P-UT, which was 43.60 µm and the lowest at PU-W was 15.66 µm. The largest decrease in skin softness occurred in PU-T from 1.88mm to 1.40 mm (down 0.48 mm) and the smallest in PU-W, which was down by 0.06mm. The hardness of the skin layer using PU-T increased from 88.66HA to 95.50HA (up 6.84 HA) and the lowest in PU-W increased by 5.5HA. The change in the contact angle of the leather surface for PU-T decrease from 770 to 490 (down 280) and the lowest for PU-W from 800 to 630 (down 170). In the variation of TiO2 concentration from 0% to 2%, the largest increase in skin weight occurred in PU-T, namely 0.13 gr and the smallest in PU-W of 0.07 gr. The change in contact angle at the variation of TiO2 concentration was not significant, the mean value of the contact angle for; NC-W, PU-W and PU-T are; 61.00, 62.20 and 58.40.
STUDI PENGARUH PENGGUNAAN ASAM SULFAT PADA PEMBUATAN REDUCED CHROME TANNING AGENT SERTA KARAKTERISASINYA Prasetyo Hermawan; Swatika Juhana
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol 19 No 1 (2020): BERKALA PENELITIAN TEKNOLOGI KULIT, SEPATU DAN PRODUK KULIT
Publisher : Politeknik ATK Yogyakarta

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Abstract

The purpose of this research was to study the effect of the weight of using H2SO4 in the manufacture of reduced chrome tanning agent. The raw materials used are salt Na2Cr2O7, molasses and H2SO4 and control is needed when adding molasses and H2SO4 because the reaction is exothermic. Reduced chromium liquid is made by varying the weight of using H2SO4; 15.5gr, 16.6gr, 18.2gr, 20gr and 26.6gr. Furthermore, the character of the reduced chromium material is tested, including using the standard SNI: 06-4993-1999 testing related to the basicity value test. The added weight of using H2SO4 at all levels of variation when producing reduced chrome yields a dark green color of the reduced chromium liquid product. In addition to the weight of using H2SO4 from 15.5 gr to 26.6 gr, there was a decrease in the basicity value from 65.91% to 0%, a decrease in the pH value from 2.83 to 1.01 and also a decrease in water content from 45.28% to 36.92%. In addition, the weight of H2SO4 was used as much as 18.2 gr, 20 gr and 26,6 gr, then by using the spectophotometric method, the average Cr (IV) concentration was obtained at 44.4 mg/L and Cr (III) was 331.9 mg/L. The weight of H2SO4 used from 18.2gr to 26.6gr decreased the yield from 91.9% to 84.01%.
Co-Authors Prasetyo Hermawan Tutik Maryati Wahyu Fajar Winata