Parameter manipulation study in producing thinner natural rubber films via response surface methodology

Abstract

In this research paper, a comprehensive parameter manipulation study was conducted to investigate the challenges and opportunities involved in producing thinner natural rubber films. Employing the design of the experiment (DOE) method and response surface methodology (RSM) allowed tuning and manipulating various dipping protocols in exploring critical factors such as total solid content of the compounded latex, coagulant concentration, and dipping time. As such, the aim is to discern their individual and collective influence on film thickness and subsequently physical properties such as tensile strength and thermal ageing. In this study, the response surface refinement was conducted via central composite design (CCD) using these three factors: total solid content of the compounded latex, coagulant concentration, and dipping time. Based on the regression analysis, the optimum condition for thinner NR films with good tensile strength and ageing properties was achieved with final dipping protocols comprising 20% TSC, 5% coagulant concentration, and 5 s dipping time. The resulting responses from the validation experiments for thickness, tensile strength, and ageing were 0.073 mm, 18.11 MPa and 20.82 MPa, respectively. The implications of these findings are significant for the latex-dipped product sector, particularly in glove manufacturing. They facilitate the creation of cost-effective, thinner gloves while maintaining essential mechanical and ageing properties, which is vital for both medical and industrial uses. The result also shows that, perhaps with extra caution, RSM can be applied effectively in optimising the properties of the dipped film.