Effect of external process (sterlization) on the plastic injection moulded parts

International Conference on Polymer Science & Engineering

August 22-24, 2016 New Orleans, USA

Trivikrama Bhanoji Pala and I. Joga Rao

New Jersey Institute of Technology, USA

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

External Processes like sterilization on plastics has become an important factor in industry. Sterilization is very common process in the medical device industry to ensure the safety of the devices. Product designer needs to be cognizant of the effect of sterilization in plastic Injection molded parts. An experimental method is conducted to find out the effect of the Mechanical properties such as tensile strength analysis and also Creep analysis on the Injection molded parts before and after sterilization (radiation). Injection molded specimen made up of PP (polypropylene) with Gamma radiation of 25 kGy(kilogray) dose is considered for study. Radiation interacts with polymers in two ways: chain scission, which results in reduced tensile strength and elongation; and crosslinking, which increases tensile strength but reduces elongation. Both reactions occur simultaneously, but one is usually dominant, depending upon the specific polymer and additives involved. The results of Creep analysis are used in finite element methods to solve the impact of creep between the parts under load over time. Manufacturers should be cognizant of the possible impact of radiation on mechanical properties such as tensile strength, elastic modulus, impact strength and elongation. Outcomes may influence performance and should be evaluated in advance by functional testing. Disscussion and Results: The samples used for this study were injection molded ASTM Type 1 specimens.These are molded as per the injection molding condition of the respective resins. 5 samples. ASTM D 638-210 Standard Test Method for Tensile properties of plastics were used for tensile testing. Conclusion:Effects of sterilization(radiation) plays an important role on the plastic injection molded parts.Results shows that Tensile strength and Modulus of Elasticity is Partially increasing at all 3 given 3 temperatures 23,40 and 60 degree C. And Strain at yield and Creep strain at given time is showing decreasing trend.These finding are very much useful to the Product Design. Manufacturers should be cognizant of the possible impact of radiation on mechanical properties and the outcomes may influence performance and should be evaluated in advance by functional testing.

Biography :

Trivikrama Pala is a student of PhD from NJIT, New Jersey.

Email: tbp8@njit.edu