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3.4. Preparation of Samples There were 3 types of specimens produced which were neat HDPE, HDPE/woven kenaf with composition of 90/10 and HDPE/woven kenaf with composition of 80/20. Neat HDPE was produced as a benchmark to compare the result with the composites. The composites were fabricated using sandwich/laminate method. Table 3.3 shows the fiber and matrix weight fraction for each type of specimen. The first step to produce the composites was to prepare the neat HDPE layer. The procedure was explained below. TABLE 3. 3. Fiber and matrix weight fraction for each specimen. Specimen Neat HDPE HDPE/kenaf Matrix (wt.%) Woven kenaf (wt.%) No. of samples 100 80 90 10 5 0 20 5 5 Procedures of preparing neat HDPE layers: 1. A thin layer of wax was applied on the surface of the mold for the neat HDPE layer to be easily removed. 2. 120 g of HDPE pellets were weighed using an electronic balance and then put inside the mold cavity. 3. The top cover of the mold was closed and the mold then was inserted into the CARVER Inc compression machine. 4. The compression machine was setup t 1 temper ture nd 1 ton force pressure. 5. The mold was preheated for about 10 minutes before it was compressed under pressure for 20 minutes. 6. The mold was then cooled down under pressure using ir supply n extern l f n to help in f ster cooling until the temper ture drop to 7. Then, the compression was stopped and mold was removed from the machine. 8. HDPE layer was removed and weighed using the electronic balance. 12PDF Image | Woven Kenaf Reinforced High Density Polyethylene HDPE
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