Abstract
This study aims to compare open and closed molds, hand lay-up method in the manufacture of skate board boards from oil palm empty fruit bunches (OPEFB) fiber reinforced composites. The constituent materials of this composite are OPEFB fiber and unsaturated polyester resin. The mixing of both of materials with the ratio of the composition of the OPEFB fiber and polyester resin is made based on a volume fraction of 20:80. The diameter of the OPEFB fiber that is used ranges from 0.1 to 0.8 mm mixed into the unsaturated polyster resin liquid. OPEFB fibers are arranged longitudinally with one layer according to the thickness of the skate board. Skate board prints made using a cover have smooth surfaces on both sides. However, to ensure that the resin has filled the entire surface of the mold from a closed mold seen from the presence of resin that comes out of the closing gap. This resin can not be used anymore because it will dry up and freeze. When compared with printouts without pentup has a rough surface on the top side of the skate board. The conclusion is that the use of closed molds has better results when compared to open molds.
Highlights
This study aims to compare open and closed molds, hand lay-up method in the manufacture of skate board boards from oil palm empty fruit bunches (OPEFB) fiber reinforced composites
Magrab, Integrated Product and Process Design and Development, New York: Cambridge University Press, 1981. [11] Sivertsen, K., Polymeric Foam., (online) (http://ocw.mit.edu/courses/materials-science-andengineering/3-063-polymer-physics-spring-007/assignments/polymer_foams.pdf., diakses 15 Januari 2011.)
Summary
Dalam pembuatan skate board ini menggunakan 2 cetakan seperti terlihat pada gambar 4, yaitu: 1. Cetakan terbuka 2. Dalam pembuatan skate board ini menggunakan 2 cetakan seperti terlihat pada gambar 4, yaitu: 1. Proses pencetakan skate board dan sepesimen uji dilakukan dengan langkah-langkah sebagai berikut: 1. Oleskan lapisan pemisah pada bagian dalam cetakan dengan mold release wax agar mudah melepas produk dari cetakan. 2. Persiapan bahan-bahan yang diperlukan yaitu serat, resin tipe BQTN 157-EX yang merupakan polyester resin tak jenuh kemudian masukkan ke dalam gelas ukur volume sesuai dengan berat campuran yang ditetapkan. 3. Campurkan terlebih dahulu polyester resin tak jenuh dan serat TKKS kemudian aduk hingga merata beri kode C1. 4. Campurkan katalis kedalam campuran serat dan resin dan aduk hingga merata beri kode C2. 5. Tuang campuran C2 kedalam cetakan, 6. Tuang kembali campuran C2 kedalam cetakan dan biarkan selama 24 jam hingga benar mengeras dan kering.
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