Perekayasaan Mesin Injeksi Bakalan Acuan Sepatu Secara Sederhana

Engineering of the injection molding machine to mold a master last made of plastics was done in the simple mechanism. Machine specification is a single screw, screw diameter 40 mm, ratio L/D = 24/1, heater 220/380 V. 700 W, motor 5,5 Hp, capacity 500 cm3/ minute. INTISARI Telah dilakukan suatu perekayasaan mesin injeksi sederhana untuk membuat bakalan acuan sepatu dari plastik. Mesin injeksi sederhana hasil rekayasa memiliki spesifikasi teknis sebagai berikut : jenis “Single Scren, diameter screw 40 mm, rasio L/D = 24/1, pemanas listrik 220/380 V dengan daya 700 W, motor induksi 5,5 Hp, kapasitas 500 cm3/menit

Photokopolimerisasi Monomer Akrilat Degan Kulit Kras Sapi

The research on photocopolymerization of acrylate monomer with cow crust hide had object to observe the resulted copolymer onto cow crust hide. Crust hides, saturated with aqueous emulsions containing 25 wt % of n-butyl acrylate (n-BA) or tripropylene glycol diacrylate (TPGDA) were irradiated by cobalt – 60 gamma rays with doses ranges from 5 to 25 kGy. The irradiated hides were washed with water, dried in air and extracted in soxhlet apparatus for 48 hours to remove homopolymer. The highest yield of photocopolymerization of n – butyl acrylate monomer with crust hides was found 17,7878% at dose 25 kGy, and for photocopolymerization of tripropylene glycol diacrylate with crust hides was found 39,4245% at dose 20 kGy. INTISARI Penelitian photokopolymerisasi monomer akrilat dengan kulit kras sapi bertujuan untuk mengetahui banyaknya kopolimer yang dihasilkan didalam kulit kras sapi. Kulit kras yang sudah dijenuhkan dengan emulsi n – butyl akrilat atau tripropilena glikol diakrilat dalam air dengan konsentrasi monomer 25% berat, diiradiasi dengan sinar gamma kobalt – 60 dengan dosis yang bervariasi dari 5 sampai 25 kGy. Kulit yang sudah diradiasi dicuci dengan air, dikeringkan di udara dan diekstraksi dalam peralatan soxhlet selama 48 jam untuk menghilangkan homopolimer. Hasil tertinggi dari photokopolimerisasi monomer n – butyl akrilat dengan kulit dicapai pada dosis 25 kGy yaitu sebesar 17,7878%, dan untuk photokopolimerisasi monomer tripropilena glikol diakrilat dengan kulit dicapai pada dosis 20 kGy sebesar 39,4245%

Penggunaan Resin Epoksi Untuk Pegangan Alat-alat Dapur

Application of epoxy resin to make the kitchen tolls holder was investigated. Optimum compound of kitchen tools holder was reached for compound which it consist of epoxy resin : 100 parts, hardener 100 parts, carbon black 50 parts. Applied test in hot water show that the kitchen tools holder from research is better than the kitchen tools holder from markets. INTISARI Telah dilakukan penelitian tentang penggunaan resin epoksi untuk pegangan alat-alat dapur. Formula kompon pegangan alat dapur yang optimum dicapai untuk kompon yang berisi resin epoksi 100 bagian, hardener 100 bagian, dan carbon black 50 bagian. Hasil uji pemakaian dalam air panas menunjukkan bahwa pegangan alat-alat dapur hasil penelitian lebih baik dibandingkan pegangan alat-alat dapur yang ada di pasaran

Penggunaan Zeolit Alam Untuk Mengurangi Kandungan Krom Dan Nh4+ Dalam Air Limbah Penyamakan Kulit

Leather tanning waste water contains chemical compounds, such as chromium and NH4+ in high concentration, so if they are thrown away without treatment they will make some problems. The aims of this research is to adsorb the cations in leather tanning waste water i.e chromium and NH4+ used natural zeolite as an adsorbent. Research was done by comparing amount of chromium and NH4+ in effluent waste water treatment unit with amount of chromium and NH4+ after being adsorbed by zeolite in a batch system. The result of this research showed that efficiency difference between using zeolite and waste water treatment unit was significant. The optimal condition to reduce chromium and NH4+ was by using 300 grams per liter waste, zeolite particle size was 50-60 mesh, contact time was 24 hours and pH 8±0,1. In this condition, zeolites could reduce chromium from 3728,56mg/l to 365,39 mg/l or 90,20%, and NH4+ from 3040,02 mg/l menjadi 209,76 mg/l or 93,10%. Waste water treatment unit could reduce chromium 63,55% and NH4+ 56,75%

Penelitian Pengaruh Teknik Pencetakan Kompon Sol Karet Terhadap Sifat Fisisnya

The objective of this research is to know the influence of molding technique to the physical properties for rubber sole compound by a hydraulic press machine and a vulcanization molding machine. In the same process condition, there are physical properties different between the soles were molded by a hydraulic press machine and the soles were molded by a hydraulic press machine was reached on the vulcanization time 15 min at temperature 165C, and pressure 100 kg/cm2. Whereas optimal physical test value for the soles were molded by a vulcanization molding machine was reached on the vulcanization time 20 min, at temperature 165C, and pressure 1500 psi. INTISARI Penelitian ini bertujuan untuk mengetahui pengaruh teknik pencetakan kompon sol karet dengan mesin “hydraulic press” dan mesin cetak vulkanisasi terhadap sifat fisisnya. Pada kondisi proses yang sama ada perbedaan sifat fisis antara sol yang dicetak dengan mesin “Hydraulic press” dan mesin cetak vulkanisasi. Sifat fisis optimal untuk sol karet yang di cetak dengan mesin “hydraulic press” dicapai dalam waktu 15 menit pada suhu 1650C dan tekanan 100 kg/cm2. Sedangkan sifat fisis optimal untuk sol karet yang dicetak dengan mesin cetak vulkanisasi dicapai dalam waktu 20 menit pada suhu 1650C dan tekanan 1500 psi