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INTRODUCTION 1.1 Background Polymers have various worthwhile properties such as high strength-to-weight ratio, high flexibility, and high chemical and corrosion resistance, which make them suitable for modern-day industrial and engineering applications. Polymers have not only replaced metals in structural applications. But nowadays they are also used as a substitute for glass in various optical applications. Automobile parts, aircraft windshields, medical device enclosures and packaging telephones, human body prostheses, etc., are some of the polymer utilization examples [1] in daily life. Extrusion, injection molding, compression molding, blow molding, rotational molding, spinning, and thermoforming are the various polymer processing methods