Articles

Found 6 Documents
Search

KAJIAN MANFAAT EKONOMIS PENERAPAN KONSEP PRODUKSI BERSIH PADA INDUSTRI KARET REMAH BERBASIS KARET RAKYAT Utomo, Tanto Pratondo; Fauzi, Anas Miftah; Irawadi, Tun Tedja; Romli, Muhammad; Aman, Amril; Honggokusumo, Suharto
Majalah Ilmiah Ekonomi Komputer 2007: Majalah Ilmiah Ekonomi Komputer Edisi Agustus
Publisher : Majalah Ilmiah Ekonomi Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1076.352 KB)

Abstract

Tujuan penelitian ini adalah menganalisis manfaat ekonomis penerapan konsep produksi bersihberdasarkan altematif terpilih untuk perbalkan proses pada industri karet remah yang dapal meningkatkanefisiensi dan mengurangi resiko pencemaran dan dapat diterapkan pada penyedia bahan baku (petani karet,KUD, dan pedagang pengumpul) dan pengolahan bokar menjadi karet remah (pabrik karet remah). Hasilpenelitian menunjukkan bahwa penerapan konsep produksi bersih pada industri karet remah berbasis karetrakyat yang diterapkan pada tahap penyediaan bahan baku dan pada tahap pengolahan bokar menjadi karetremah menghasilkan keuntungan ekonomis dengan (1) penghematan air sebanyak 18,5 m3110n karet kering;(2) penghematan energi senilai Rp. 7.91011on karet kering; (3) tidak diperlukan investasi untuk peralatanpenghilangan bau (malodour); (4) dihindari terjadinya kerugian akibat proses penggantungan selama 14 harisenilai Rp. 70/kg bokar; dan (5) tahapan proses pengolahan bokar menjadi karet remah lebih singkat dengantidak digunakannya mesin hammer-mills. Dampak ekonomis yang bersifat menambah biaya adalah (1)diperlukan investasi tambahan untuk resirkulasi air; (2) investasi fasilitas penggilingan bokar; dan (3) investasibiaya pengolahan Iimbah berupa serum hasil pengpresan bokar pada tingkat petani karet.Kata kunci: produksi bersih, bokar, karet remah, manfaat ekonomis
The Effect of Rubber Mixing Process on The Curing Characteristics of Natural Rubber Hasan, Abu; Rochmadi, Rochmadi; Sulistyo, Hary; Honggokusumo, Suharto
Makara Journal of Technology Vol 16, No 2 (2012)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (133.561 KB) | DOI: 10.7454/mst.v16i2.240

Abstract

This research is aimed at studying the relationship between rubber mixing processes and curing characteristics of natural rubber. The curing characteristic analysis was carried out through a natural rubber formula having been masticated and mixed, followed by curing. As many as four mastication methods were finely applied; each respected four sequences of rubber mixing process. In the first method, rubber was masticated for 5 minutes and then rubber chemicals and carbon black N 330 were  simultaneously added. In the second and the third methods, rubber was masticated for 1 minute and then carbon blacks and rubber chemicals were also simultaneously added but using different type of fillers. In the fourth method, rubber was masticated for 3 minutes and then rubber chemicals and carbon black were subsequently added. The additions of rubber chemicals and carbon blacks to the masticated rubber were distinguished by the sequence and time allocated for each mixing process. The carbon blacks were added in two stages by which 10 phr was added first and the remaining 40 phr was added later along with oil. In another method, ratios of the carbon blacks addition (as done in the first  and the second stages) were 20:30, 30:20, and 40:10. The examination results showed that rubber mixing process gave an impact on the changes of curing characteristics. They were much affected by the method of carbon black addition. The mixing temperature also had an effect on both curing time and curing rate in which the higher the mixing temperature, the lower the curing time and curing rate. Vulcanization temperature also affected the curing time and curing rate in which the higher the vulcanization temperature, the lower the curing time and the higher the curing rate. Lastly, particle size of carbon black also gave an impact on the curing time and curing rate in which the smaller the particle size, the lower the curing time and the higher the curing rate.
Vulcanization Kinetics of Natural Rubber Based On Free Sulfur Determination Hasan, Abu; Rochmadi, Rochmadi; Sulistyo, Hary; Honggokusumo, Suharto
Indonesian Journal of Chemistry Vol 13, No 1 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (935.581 KB) | DOI: 10.22146/ijc.21321

Abstract

The determination of free sulfur in the rubber vulcanizates provided significant representation of vulcanization reaction. In this research, the effects of vulcanization temperature, the mixing method of carbon black into rubber, the ingredients mixing sequence and the type of carbon black were studied on masticated and milled natural rubber in which the reaction was observed by un-reacted sulfur determination. The results showed that higher vulcanization temperature provided faster vulcanization reaction and greater reaction rate constant. Similarly, the mixing sequence of ingredient and carbon black into rubber influenced the rate of vulcanization reaction. The subsequent ingredients mixing sequence, in this case, resulted in higher vulcanization rate compared to that of the simultaneous one. However, the mixing method of carbon black into rubber brought small effect on the rate of vulcanization reaction. The type of carbon black applied was observed to influence the reaction rate of vulcanization. Smaller particle sizes of carbon black gave larger reaction rate constant. In this case, the type of carbon black N 330 gave faster vulcanization rate than that of N 660.
The Effect of Ingredients Mixing Sequence in Rubber Compounding upon Vulcanization Kinetics of Natural Rubber: An Autocatalytic Model Study Hasan, Abu; Rochmadi, Rochmadi; Sulistyo, Hary; Honggokusumo, Suharto
Indonesian Journal of Chemistry Vol 18, No 4 (2018)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (15.89 KB) | DOI: 10.22146/ijc.25707

Abstract

This study examined the effect of ingredients mixing sequence to the vulcanization kinetics of natural rubber. The effects of mixing temperature, vulcanization temperature, and the carbon black type upon the kinetics were also studied by using rheography and an autocatalysis reaction model approach. The results showed that this model is good in providing information on vulcanization reaction kinetics of natural rubber. High vulcanization temperature resulted in high reaction rate constant. The more black carbon mixed at the beginning of the rubber mixing process, the higher reaction rate constant would be. The mixing of carbon black and rubber chemicals mixed into the rubber subsequently resulted in the higher reaction rate constant compared with that of simultaneously.
THE INFLUENCE OF MASTICATION TO CURING CHARACTERISTIC OF NATURAL RUBBER AND PHYSICALPROPERTIES OF ITS VULCANIZATES Hasan, Abu; Rochmadi, Rochmadi; Sulistyo, Hary; Honggokusumo, Suharto
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2011.12.2.4590

Abstract

THE INFLUENCE OF MASTICATION TO CURING CHARACTERISTIC OF NATURAL RUBBER AND PHYSICALPROPERTIES OF ITS VULCANIZATES. The research on the mastication that influences the curing characteristic of natural rubber and physical properties of its vulcanizates has been conducted. The research started from rubber mastication with variation of carbon black filler addition into rubber compound. Rubber compound was then measured to identify its curing characteristic using rheometer and tested its viscosity using Mooney viscosity tester. Physical properties of rubber vulcanizates such as abrasion resistance, tear strength, and elongation at break were also measured. The results indicated that curing characteristic tended to decrease, while only scorch time tended to increase from B1, B2, B3 and B4. Elongation at break tended to decrease, while tear resistance and abrasion resistance tended to increase from B1, B2, B3 and B4. Mooney viscosity of the compound also tended to decrease. It can be concluded that B1 is better than B2, B3 and B4. However, if rubber vulcanizates require high tear resistance and abrasion resistance, such as for shoes sole and tread of tire, then B4 is the most appropriate vulcanizate.
PEMILIHAN AREA PENGETAHUAN KUNCI PADA PROSES PRODUKSI BARANG CELUP LATEKS DENGAN PENDEKATAN LOGIKA FUZZY Sugiarto, Dedy; Ma?arif, M Syamsul; Marimin, Marimin; Sailah, Illah; Sukardi, Sukardi; Honggokusumo, Suharto
JURNAL TEKNIK INDUSTRI Vol 2, No 1 (2012): Volume 2 No 1 Maret 2012
Publisher : Jurusan Teknik Industri, Fakultas Teknologi Indusri Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jti.v2i1.7016

Abstract

One of important aspect in codification strategy in relation to knowledge management implementation is selective in choosing knowledge area to be codified. This paper showed a model for selecting key knowledge area using knowledge gap analysis and importance-performance matrix with fuzzy logic approach from latex dipped production process. Model was packaged in decision support system which designed using visual basic for applications and Matlab programming. Fuzzy average technique and Sugeno fuzzy inference system were used in this model. Four key knowledge areas detected based on two methods. They were compound formulation, product inspection and failure analysis, dispersion inspection and leaching.