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Biodegradasi dan morfologi polipaduan grafting LDPE tapioka dengan inisiatir dicumil peroksida Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 27, No 1 (2011): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

abstrak

Pengaruh carbon black pada pembuatan plastik untuk irigasi sistem tetes Arum Yuniari; Dwi Wahini Nurhajati; Niken Karsiati
Majalah Kulit, Karet, dan Plastik Vol 17, No 1-2 (2001): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The objective of this experiment was to know the influence carbon black was added to the plastics for drip irrigation systems. Plastics of 0,2 mm thickness for drip irrigation system was made from mixing of lwo density polyethylene (LDPE), high density polyethylene (HDPE) and carbon black by a blown film machine on the fixed processing condition. The investigated carbon black content were 0; 2,5; 5; 7,5; and 10 phr respectively and LDPE/HDPE ratio were 0/100, 50/50, 100/0 respectively. The physical properties tes showe and increasing of carbon black decreasing tensile strength, elongation at break, tear strength and brittleness. The best formulation was consist of HDPE 100 phr and carbon black 10 phr, with the physical properties as follows : tensile strength 158 kg/cm2, elongation at break 140%, and tear strength 91,46 kg/cm2.INTISARIPenelitian ini bertujuan untuk mengetahui pengaruh carbon black pada pembuatan plastic untuk irigasi system tetes. Plastic tebal 2 mm dibuat dari low density polyethylene (LDPE), high density polyethyln (HDPE) dan carbon black menggunakan mesin blown film pada kondisi proses yang tetap. Carbon black yang digunakan adalah 0; 2,5; 5; 7,5; 10 phr dan ratio LDPE/HDPE adalah 0/100, 50/50, 100/0 phr. Sifat fisis menunjukkan bahwa kenaikan carbon black menurunkan kuat tarik, kemuluran, kuat sobek dan kerapuhan. Formulasi terbaik terdiri dari HDPE 100 phr dan carbon black 10 phr, dengan sifat fisis sebagai berikut : kuat tarik 158 kg/cm2, kemuluran 140% dan kuat sobek 91,46 kg/cm2.

Pengaruh teknik dan waktu pencampuran pada pembuatan lembaran cocodust berkaret untuk bahan peredam suara Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 25, No 1 (2009): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Research about cocodust rubber sheet production for sounds absorbent material was determined to improve mixing technology between cocodust and latex compound so there can be gained effective mixing technology. There are 2 methods regarding to mixing technology which were A method and B method with time variation method between 2, 3 until 4 minute respectively time. A method was cocodust with sieved by 50 mesh siefter mixed with water (ratio time between cocodust and water 1:3) and subsequently cocodust was mixed with latex compound. While B method was mixing latex compound and water (the mixture consisting of 3 part of water and 1 part of latex) and the final product was blended. The result show that A method with time variation of 2 – 3 minutes was the best effective mixing method. The result of a method can be easily implemented, having homogeny compound and good product performance, which was characterized by mass density 0,40 g/cm3, water content 7,29 – 7,57%, flexibility strength 2,87 – 4,05 kg/cm2, vertical tensile strength 1,97 – 3,12 kg/cm2, ability to be nailed 4,95 – 5,92 kg, thickness grows 7,5 – 8,28% and sound absorption coefficient at the frequency 500 Hz was 0,70. Keywords: cocodust, latex compound, sound absorbent. ABSTRAKPenelitian tentang pembuatan lembaran cocodust berkaret untuk bahan peredam suara bertujuan untuk menyempurnakan teknik pencampuran antara cocodust dengan bahan perekat (kompon lateks) agar diperoleh metode pencampuran yang efektif. Teknik pencampuran dilakukan dengan 2 metode yaitu metode A dan metode B dengan variasi waktu pencampuran berturut-turut 2, 3 dan 4 menit untuk masing-masing metode. Metode A menggunakan cocodust diameter 50 mesh dibasahi dengna air lebih dahulu (perbandingan cocodust : air adalah 1 : 3), selanjutnya cocodust dicampur dengan kompon lateks. Metode B menggunakan kompon lateks yang diencerkan dahulu dengan air (3 bagian air dan 1 bagian lateks) selanjutnya dicampur dengan cocodust lolos saring 50 mesh. Hasil penelitian menunjukkan bahwa metode pencampuran A, dengan variasi waktu pencampuran 2 – 3 menit merupakan metode pencampuran yang efektif mudah dilakukan, menghasilkan campuran homogen tanpa ada penggumpalan, kenampakan produk cukup bagus dengan sifat fisika kerapatan 0,40 g/cm3, kadar air 7,29 – 7,57%, kuat lentur 2,87 – 4,05 kg/cm2, kuat tarik tegak lurus permukaan 1,97 -3,12 kg/cm2, kuat pegang sekrup 4,95 – 5,92 kg, pengembangan tebal 7,5 – 8,28% dan koefisien penyerapan suara pada frekuensi 500 Hz sebesar 0,70. Kata kunci: cocodust, kompon lateks, peredam suara.

Pengaruh penambahan filler kapur dan kaolin terhadap kekerasan dan pukul takik kompon PVC Sofyan Karani; Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 5, No 9 (1990): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The objective of this study is to detect whether there is any influence on the physical quality of the PVC compound (hardness and impact resistant). Which CaCO3, kaolin and mixture of CaCO3 and kaolin as filler is added into the batch. The more the filler added into the batch, the higher the hardness will be. The highest figure of the test result can be presented as follow : with the addition of 135 phr CaCO3 as filler the hardness is 71,2 shore D, addition 135 phr CaCO3 as filler the hardness is 74,0 shore D, while with the addition of 55 phr CaCO3 and 80 phr kaolin, the hardness is 77,0 shore D.The more the CaCO3 filler added into the bath, the higher the impact resistance will be, whereas the more the kaolin as filler added the lower the impact resistance will be. By the addition 135 phr of CaCO3, the highest figure of the impact resistance is 4,34 kg cm/cm and by the addition of kaolin the highest figure is 1,99 kg cm/cm with 75 phr kaolin.While by the addition of the mixture of 40 phr CaCO3 and 50 phr kaolin as filler, the highest figure is achieved at 2,98a kg cm/cm, and after that it will be decreasede. INTISARI Penelitian ini bertujuan untuk mengetahui pengaruh penambahan filler kapur, kaolin dan filler campuran akpur dengan kaolin kekerasan dan ketahanan pukul takik kompon PVC.Kekerasan makin tinggi dengan bertambahnya pemakaian filler, kekerasan tertinggi untuk filler kapur adalah 71,2 Shore D pada penambahan 135 phr dan untuk filler kaolin adalah 74,0 Shore D pada penambahan 135 phr, sedangkan untuk filler campuran kekerasan tertinggi adalah 77,0 Shore D pada penambahan kapur 55 phr dengan kaolin 80 phr.Ketahanan pukul takik untuk filler kapur makin tinggi dengan bertambahnya pemakaian filler, dan untuk filler kaolin pemakaian makin bertamb ah ketahanan pukul takik makin rendah. Ketahanan pukul takik tertinggi untuk filler kapur adalah 4,34 kg cm/cm pada penambahan 135 phr dan untuk filler kaolin ketahanan pukul takik tertinggi adalah 1,99 kga cm/cm pada penambahan 75 phr. Sedangkan untuk pemakaian filler campuran kapur dan kaolin ketahanan pukul takik naik sampai pemakaian kapur 40 phr dan kaolin 50 phr, yaitu 2,98 kg cm/cm, kemudian akan menurun

Rancang bangun pabrik plastik dari bahan polietilen food grade Irene Sri Sukaeni; Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 9, No 16 (1994): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The aim of this research is to find out process of production and the relation between cost, sell price and percentage of break even point. Production of capacity planned is 43.200 bottles perday, so that in a year with 288 workday, capacity produced is 12.400.000 bottles. The economical calculation are as follows the total capital is fixed capital + working capital - Rp. 1.489.200.308,00 ; the total production cost is variable cost a year + fixed cost a year = Rp.3.532.949.829,00;. The manufacturing cost = Rp. 285,00 / bottle, the profit calculation before taxing is Rp. 466.230.171,00 and after taxing is Rp. 372.984.136, the pay out period calculation consist of the percentage of profit to return the capital (rate of return) before taxing is 31.30%, after taxing is 25.04% and the pay out period before taxing 2 year 11 months, after taxing 3 year 7 months ; the break even calculation consist of break even point is Rp. 1.988.929.421,00; the percentage of break even point is 49,73% and the capacity of break even point is 6.166.25O bottles

Pengaruh penggunaan nitril butadiene rubber dan pale crepe pada pembuatan sol karet untuk sepatu pengaman Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 26, No 1 (2010): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Rubber sole for safety shoes was different on physical specification with general sole, especially on abrasion resistance and oil resistance. The objective of the study was to determine the effect of nitril butadiene rubber and pale crepe on physical properties of vulcanized rubber sole for safety shoes. Rubber sole for safety shoes was produced by blending pale crepe and nitril butadiene rubber with ratio of : 50/50; 60/40; 70/30 and 80/20 phr, respectively. Carbon black as filler was also variated with, 40 ; 50 and 60 phr. Compounding processing used two roll mill machine and vulcanized rubber sole was by using pressed use hydraulic press machine. The results showed that vulcanized rubber sole for safety shoes with good quality consist of pale crepe and NBR 80/20 phr and carbon black 40 phr, which was characterized by tensile strength 16.81 N/mm2, tear strength 11.68 N/mm, density 1.12 g/cm3, abrasion resistance 58.51 mm3, hardness 71.60 shore A, resistance to cut growth 30.000 times was 1.15 mm and oil resistance 65.44%, respectively. The quality parameters was complied with standard quality of SNI 0111 : 2009, for safety shoes from leather and vulcanized rubber sole that fulfill oil reistance parameter. Keywords : pale crepe, nitril butadiene rubber, carbon black, rubber sole, safety shoes. Sol karet sepatu pengaman mempunyai perbedaan spesifikasi teknis dengan sol karet pada umumnya, terutama sifat fisiknya seperti ketahanan kikis dan ketahanan minyak. Tujuan penelitian ini adalah untuk mempelajari pengaruh penggunaan nitril butadiene rubber dan pale crepe terhadap sifat fisika vulkanisat sol karet untuk sepatu pengaman. Sol karet sepatu pengaman dibuat dengan campuran bahan baku karet alam (pale crepe) dan karet sintetis NBR dengan variasi berturut-turut 50/50 ; 60/40; 70/30 dan 80/20 phr. Sebagai bahan pengisi digunakan carbon black dengan variasi 40; 50 dan 60 phr. Bahan-bahan digiling menggunakan peralatan two roll mill, sedang pencetakan kompon digunakan mesin hydraulic press. Hasil uji menunjukkan bahwa vulkanisat sol karet untuk sepatu pengaman dengan kualitas terbaik diperoleh dari ratio pale crepe dan NBR 80/20, carbon black 40 phr, dengan nilai tegangan putus sebesar 16,81 N/mm2, ketahanan sobek 11,68 N/mm, bobot jenis 1,12 g/cm3, ketahanan kikis 58,51 mm3, kekerasan 71,60 shore A, ketahanan terhadap perluasan sobekan 30.000 kali adalah 1,15 mm dan ketahanan terhadap minyak pelumas 65,44 %. Hasil uji tersebut memenuhi persyaratan SNI 0111 : 2009, sepatu pengaman dari kulit dengan sol karet sistem cetak vulkanisasi kecuali parameter ketahanan terhadap minyak pelumas tidak memenuhi yang disyaratkan. Kata kunci : pale crepe, nitril butadiene rubber, carbon black, sol karet, sepatu pengaman.

MKKP Vol. 32 No. 1 (2016) Reviewer Acknowledgement Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 32, No 1 (2016): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Determination of vulcanization rate constant, crosslink density, and free sulfur content on carbon black flled EPDM Ike Setyorini; Arum Yuniari
Majalah Kulit, Karet, dan Plastik Vol 33, No 2 (2017): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v33i2.3345

Diﬀerent ethylene propylene diene monomer (EPDM) composite with the carbon black (CB) variation of 50, 60, and 70 phr (per hundred rubbers) is compounded by using an efcient (EV), semi-efcient (SEV), and conventional (CV) sulfur vulcanization systems. This research aims to investigate the eﬀect of vulcanization systems and carbon black content on the vulcanization rate constant, the crosslink density, and the free sulfur content. This research shows the EV system resulting in the fastest vulcanization rate constant (0.0191/second), the lowest overallcrosslink density (0.0022 mol.cm-3), and the highest percentage of free sulfur content in the EPDM vulcanization (0.40 %). The CV system provides the slowest vulcanization rate constant (0.0061/second) and the highest overall crosslink density (0.0034 mol/cm-3). The percentage of free sulfur content in the EPDM vulcanization of CV system is between EV and SEV systems. The SEV system provides the vulcanization with the characteristic of vulcanization rate constant and overall crosslink density between EV and CV systems as well as provides the lowest percentage of free sulfur content (0.29 %). The higher carbon black loading in each vulcanization systems means the lower rate constant of vulcanization and the higher overall crosslink density.

Sifat elektrikal dan thermal nanokomposit HDPE/NPCC Dwi Wahini Nurhajati; Arum Yuniari; Emiliana Kasmudjiastuti
Majalah Kulit, Karet, dan Plastik Vol 27, No 1 (2011): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

abstrak

Penelitian penggunaan minarex oil sebagai processing oil dalam pembuatan kompon tegel karet Arum Yuniari; M Sri Wahyuni
Majalah Kulit, Karet, dan Plastik Vol 11, No 21 (1996): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Minarex A, B, C, D are processing oil produced by PERTAMINA, side product from crude oil. The aim of this research is to find out maximum quantity of Minarex oil which can be added to rubber compound for Rubber Tile and which can fullfill the requirement of SNI 1550-89-A “Tegel Karet”, variation of minarex 5,5 parts, 6,5 parts & 7,5 parts. Test result which fullfill the requirement of SNI 1550-89-A “Tegel Karet” is compound applied Minarex type A 7,5 parts. INTISARI Minarex A, B, C, D adalah minyak pelunak produksi PERTAMINA yang merupakan hasil samping pengolahan minyak bumi. Penelitian ini bertujuan mengetahui jumlah maksimum penggunaan minarex sebagai processing oil pada pembuatan kompon tegel karet. Kompon tegel karet dibuat dengan memvariasikan jumlah minarex 5,5, 6,5 dan 7,5 bagian. Sebagai tolok ukur digunakan SNI 1550-89-A “Tegel Karet”. Hasil penelitian menunjukkan bahwa hanya Minarex A yang cocok digunakan sebagai processing oil untuk pembuatan tegel karet dengan jumlah maksimum 7,5 bagian.

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