Development of rubber filament extrusion line controlled by arduino board
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Date
2019-05
Authors
Mifzal Ahmad Bin Mohammed Iqbal
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Abstract
The objective of this research was to rubber threads that are made from natural rubber latex extracted from rubber trees. It is only through a complex manufacturing process that raw latex can be processed into its thread variant. Latex compounding is addition process of compounding ingredients to latex. The ingredients added depends on the chosen formulation for specific products. Classification of compounding ingredients are HA(highly ammonia) Latex, vulcanizing agents (curatives), accelerators, activators and retarders, antidegradants (antioxidants, protective waxes), processing aids (peptizers, lubricants, release agents), fillers (carbon blacks, nonblacks materials), plasticizers, softeners, tackifiers and color pigments. Latex is coagulated by adding acetic acid. When acid is added to latex, the hydrogen ions from the acid will neutralise the negative charges on the surfaces of collodial particles. The collisions between the latex particles break the protein membrane and releases the rubber polymers. The rubber polymers can coalesce and form lumps of rubber. The lumps of rubber are white solids and are quite elastic. Preliminary test on total solid content (TSC), dry rubber content (DRC) and mechanical stability time (MST) of NR latex are conducted according to respective ISO test methods in order to determine quality of incoming raw material. This action is to prevent inaccuracy of the study results towards the mechanical properties of finished latex samples. The data shows chemical properties of NR latex within range of ISO standard which meet the requirement of good quality. Acetic acid has been used as coagulant in this test. (10% + 900ml of distilled water and 30% + 700ml of distilled water) of acetic acid been prepared to test the filaments. 30% of acetic acid become ideal concentration because the higher the concentaction the more concentrated lumps form.