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

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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 PERBAIKAN FORMULASI DYESTUFF PADA MIXING COLOR SEBAGAI ALTERNATIF PERBAIKAN KERATAAN WARNA PADA PEWARNAAN DASAR (DYEING) KULIT DOMBA GREEN CABRETTA Helis Rianti; Elis Nurbalia; Prasetyo Hermawan
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 aim of this study was to find a solution to the problem of the dyeing process of Sheep Cabretta Glove skin that experiences uneven color. One of the causes of uneven color is based on the use of different types of dyestuffs. In changing the formulation of dyeing, the focus is on replacing similar dyestuffs with acid dyes or metal complex dyes. The expected result is that the mixing of the two colors will be more optimal and the color on the skin is evenly distributed. The factors that influence the basic coloring process are pH, temperature, time, and IEP (Iso Electric Point). The raw material used is quality I - IV / V TBL of sheep crust, with shaving thickness of 0.5 - 0.55 mm, and the number of 5 sheets or 16.54 sqft with a weight of 1200 gr. While the auxiliary materials used in the dyeing processed are , Inoderme Green CJR (metal complex dyes), Coriacide Yellow 3JN (acid dyes), Ammonia, Synectan LB. The stages of the processed carried out are wetting back, retanning, fixation, dyeing, fatliquoring, shaving, and Top Fat. The method used are of observation, interviews, direct work practice, and literature study. The dyeing process method used for making sheep Cabretta glove articles is a through dyeing method. The expected results are uniform color leather by mixing similar dyestuffs, namely acid dyes or metal complex dyes and the skin obtained is green, according to organoleptic views it is not in accordance with customer standards, So that a literature study was carried out to change the dye formulation by using acid dyes, namely Coriacide Yellow 3JN with Coriacide Green BS or Coriacide Dark Green JT dyes and metal complex dyes namely Inoderme Green CJR with Inoderm Yellow JS or Melioderm HF Yellow R dyes which are expected to increase the uniform of color on the skin surface.
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%.
STUDI PEMANFAATAN GAS BUANG KNALPOT (FLUE GAS) SEBAGAI DELIMING AGENT ALTERNATIF PADA PENGOLAHAN KULIT KAMBING Prasetyo Hermawan; Alfani Risman Nugroho
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

ABSTRACT The purpose of this research was to study the process of removing lime from the skin by flowing flue gas into a solution of lime in a reactor consisting of an absorption reactor and a deliming reactor. CO2 gas which is part of the flue gas will react with the Ca(OH)2 suspension so that the pH of the lime liquid and the pH of the skin will decrease and in this study three types of motorbikes are used as a source of flue gas. The results showed that flue gas flowing in lime solution for 30 minutes resulted in a relatively constant pH of lime. The exhaust gas from motor 2 (flow rate of 6.4 liters / minute) which is flowed in the reactor has been able to reduce the pH of the lime solution from 12.60 to 7.77 (decreased by 4.49 pH units). The use of CO2 can only reduce the pH of water from 8.14 to 7.57 (decreased by 0.57 pH units). In the implementation of the variation in the height of the absorption column, the optimal value for the column height is 100 cm and is able to reduce the pH of water from 12.26 to 7.14 (decrease by 5.12 pH units). In the experiment, the addition of skin in a stirred reactor caused the ability to decrease the pH of the liquid and skin to be reduced, the pH of the lime solution was still 8.33 in the first 30 minutes and the pH stability only occurred at 45 minutes. The character of the deliming skin was also compared with the deliming method using (NH4)2SO4
Co-Authors Alfani Risman Nugroho Elis Nurbalia Helis Rianti Swatika Juhana