REQUIRED RAW MATERIAL The following materials were used in preparation of Poly lacticacid nanocomposites by the use of Titanium dioxide and Azadirachta Indica Neem powder Oil Table3 1 Material used in this project S No MATERIAL 1 Poly lacticacid PLA 2 Titanium Dioxide TiO2 Anatase 3 Azadirachta Indica Neem in powder form 4 Azadirachta Indica Neem as seed oil 3 2 COMPOUNDING OF PLA WITH TITANIUM DIOXIDE AND NEEM 3 2 1 Specifiq Intermeshing Co rotating Twin screw extruder ZV 20 The compounding was performed using an intermeshing co rotating twin screw extruder ZV20 Specifiq Engineering Vadodara India having a screw diameter of 21 mm and barrel lengths of 1200 mm L D 40 Specifiq provides extrusion screws with a modular assembly build of individual screw elements like conveying back conveying kneading and mixing elements The conveying elements are characterized by their length pitch and number of flights Details of Extruder Co Rotating Twin Screw 21 MM 7 5 HP 24 1 SPECIFIQ Used Specifiq 21 mm 24 1 model ZV20 extruder having 2 co rotating intermeshing screws Barrel consists of 1 feed section and 6 barrel sections Sections 4 5 and 6 are vented and plugged Gearbox is belt driven by a 7 5 HP Reliance DC motor with SCR controller 1 feed section with a top mounted K Torn type feeder Includes portable free standing console type panel consisting of 7 Eurotherm model 808 controllers Tag shows maximum screw speed of 600 rpm Table 3 2 Machine specification of Specifiq Co rotating
Twin screw extruder ZV 20 Machine specification of Specifiq Co rotating Twin screw extruder ZV 20 Screw Diameter mm 21 Channel Depth mm 3 5 L D 40 Driving Power Kw 10 5 Screw speed rpm 600 Torque Nm 83 Axial Load KN 13 5 Screw lengths mm 840 Barrel heating power per barrel section HP 7 5 Table 3 3 Temperature profile of different zone of twin screw extruder for compounding Feed zone Compression zone Metering zone Die Temperature Zone 1 Zone 2 Zone 3 Zone 4 Zone 5 Zone 6 150 ⁰ C 160 ⁰ C 170 ⁰ C 180 ⁰ C 190 ⁰ C 200 ⁰ C Figure 3 1 Specifiq Co rotating Twin screw extruder ZV 20 3 3 PREPARATION OF COMPOSITE Prior to compounding the pellet of poly lacticacid PLA were dried hot air oven at 800C for 12 hours fig 3 6 After predrying the PLA TiO2 Anatase Neem powder Neem oil were mixed in different weight ratio The uniform mixture of PLA TiO2 Anatase PLA Neem powder PLA Neem oil were fed in to high performance co rotating intermeshing twin screw extruder diameter of screw 21 mm L D ratio 40 model ZV20 manufactured by Specifiq Engineering Vadodara India for melt extrusion The melt temperature was 1500C to 2000C and the screw speed was maintained at 36 rpm The compounded materials passed through the different zones of the extruder and cooling water bath were finally collected in pelletized form Table 3 7 shows the sequential addition of PLA TiO2 Anatase Neem powder and Neem oil Figure 3 2 Co rotating Twin screw extruder Table 3 4 Sample codes and compounding formulation of binary and ternary blends S No Sample codes PLA Wt TiO2 Anatase Wt Neem Powder Wt Neem Oil Wt 1 Pure 100 2 I 90 10 3 II 90 10 4 III 90 5 5 5 IV 90 10 3 4 Specimen Preparation by Extrusion Blown Film
The specimen preparation was carried out by Extrusion Blown Film Machine Gururaj Engineers 30mm dia The barrel temperature was in the range of 160 190 C for different batches Table 3 5 Different zone temperatures for making film specimens by Extrusion Blown Film machine Feed zone Compression zone Metering zone Die Temperature Zone 1 Zone 1 Zone 2 Zone 1 Zone 1 Zone 2 160 ⁰ C 165 ⁰ C 170 ⁰ C 180 ⁰ C 190 ⁰ C 190 ⁰ C 3 5 EXTRUSION BLOWN FILM MACHINE Gururaj Engineers Extrusion Blown Film machine Co rotating twin screw extruder 30mm dia L D ratio is 40 The advanced technology unique to Gururaj Engineers has been accumulated over many years and results in Extrusion blown film more accurately Features Layflat width is 18 inches 25kg hr maximum production Occupied with a rotating die Promotion of product quality Remarkably improved operability and visibility Improvements made for stepped up productivity with different rpm modes Creative Control Package which makes controlled film thickness Adapted for diversified lines of films on application Figure 3 3 Schematic Diagram of Extrusion blown film machine 3 6 SAMPLE FILM PREPARATION PLA composite with TiO2 Neem powder Neem Oil were dried in Hot Air Oven at 800C for 12 hours fig 3 6 Test specimen film for analysing the antibacterial mechanical properties are prepared by high performance Extrusion Blown Film Machine Gururaj Engineers Co rotating twin screw extruder 30mm dia L D ratio of 40 The barrel temperatures of different zones used were 160 165 170 180 1900C from hopper to die and screw speed of 36rpm The test specimen for analysing the mechanical properties are initially conditioned at 23 20C and 50 5 RH for 24 hr prior to testing Figure 3 4 Hot Air Oven for Pre drying of material
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