PENENTUAN SUHU OPTIMUM BANDELA SEBELUM PROSES PENGEPAKKAN TERHADAP MUTU CRUMB RUBBER SIR 10
DI PT. PERKEBUNAN NUSANTARA III
ABSTRAK
Telah dilakukan penentuan suhu optimum bandela sebelum proses pengepakkan dengan cara pengujian Plasticity Retention Index (PRI), dari hasil penelitian diperoleh suhu optimum bandela yang memenuhi standar mutu SIR 10 adalah 40 0C. Apabila pada suhu >400C sudah dilakukan proses pengepresan, maka bandela yang telah di press akan mengalami penguapan/ pengembunan didalam plastik pembungkus yang mengakibatkan karet mentah kembali dan menjadi media pertumbuhan jamur, serta terjadinya white spots atau virgin rubber (ditandai bintik putih dan bau yang menyengat). Plastik pembungkus bandela akan lengket, dan nilai Plasticity Retention Index (PRI) akan menurun karena panas yang tertahan didalam kemasan. Dari data dan perhitungan yang diperoleh, bahwa nilai plastisitas sebelum pengusangan (P0)
adalah 42-51, dan nilai Plasticity Retention Index (PRI) yang diperoleh mencapai nilai 84,5.
DETERMINATION OF OPTIMUM TEMPERATURE PROCESS
BEFORE BALE FLAPPING QUALITY OF CRUMB RUBBER SIR
10 AT. PLANTATION NUSANTARA III
ABSTRACT
Determination of the optimum temperature has been carried out bale before flapping process by testing plasticity Retention Index (PRI), the results obtained from the optimum temperature bale that meet quality standards SIR 10 is 400C. If the temperature >4000C pressing process is done, then the bale that has been in the press will undergo evaporation / condensation inside the plastic wrapper that resulted in back and a raw rubber mold growth media, as well as the occurrence of white spots or virgin rubber (marked white spots and strong smelling). Plastic bale wrapper will be sticky, and the value of plasticity retention index (PRI) will decrease because of the heat retained in the packaging. From the obtained data and calculations, that the value of plasticity before pengusangan (P0) is 42-51, and the value of plasticity retention
index (PRI), which reached a value of 84.5 is obtained.
