Design of Web Unwinding Winding System Integrating Spraying System for Nano-Coating on Filters

Tay, Kay Vooi (2022) Design of Web Unwinding Winding System Integrating Spraying System for Nano-Coating on Filters. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

This project is aim to design a production system which performs nano-coating onto the fibres of the fabric. It has becoming urgent and important due to the COVID-19 pandemic where nano-coated filter is deemed effective in killing virus when installed to the air-conditioning system. There are 3 conceptual designs developed based on 3 different types of system, which are Rolling and Guiding with Automatic spraying system, Fabric spreading system integrating Manual Spraying System and Retractable Arm Mechanism with Manual Spraying System. By using a Pugh Matrix technique, the Fabric spreading system was selected. Integration of the strength from the other two designs were performed and an improved design was generated. Based on the improved design, engineering calculation and 3D model was generated. The engineering calculation include determining of roller diameter, sizing of motor and brakes, required pump power to maintain the flow and many more. With the computed results from the engineering calculation, an engineering design can then be finalized. The design consists of total of four stations which are Unwinding Station, Coating Station, Drying Station and Rewinding Station. The filter will be unwound and manually pulled by the operator and follow the guide rollers as installed. The filter will be automatically coated with nano liquid by the auto-spraying system when it reaches the Coating Station. At Drying Station, a hybrid infrared ray and heated air dryer is used to dry the coated filters. The working principle which is the fabric spreading system were applied at this station to ensure an even heat transfer to the fabric were applied. Lastly, the filter will be rewound at the Rewinding Station and again the filters will be guided by rollers. Furthermore, static structural analysis is then performed in order to evaluate the strength of the metal plate with computed thickness with respect to the Von Mises Stress, Total Deformation and Safety Factor of the component. Optimization of components will be performed if there is any oversized component so that wastage of material can be greatly reduce and secure the required function and guarantee the safety at the same time. Success of this project is beneficial for the client where the production rate of the nano-coated filter can definitely be increased significantly. With the huge amount of nano-coated filters, not only it will benefit the client but also the society as this filter is able to reduce the spreading of the COVID-19 virus especially when the people are staying in an enclosed room with air-conditioner running.