BITS Pilani K K Birla Goa Campus
Testing for Rotational Moulding (RM) and Service Capabilities of BITS
Dr. Sachin Waigaonkar
BITS Pilani, K K Birla Goa Campus
• About BITS Pilani
• Different Quality Tests in Rotational Moulding
• Service Capabilities for Rotational Moulding
Industry.
• Conclusions
Outline
BITS Pilani, K K Birla Goa Campus
BITS Pilani-Four Accredited Campuses
Pilani Campus (1964)
Goa Campus(2004) Hyderabad Campus(2008)
Dubai Campus (2000)
BITS Pilani, K K Birla Goa Campus
Theory learnt in classroom
Practice in Industry
Committed to University – Industry Collaboration Since its inception (1964)
As on today, Collaboration with 300+ industries
University – Industry Linkage
Practice School Programmes
BITS Pilani, K K Birla Goa Campus
Work-Integrated Learning and Collaborative Programmes
University – Industry Linkage
[20,000 students on roll | 30,000 students graduated] 33 Organizations | 24 Degree Programmes
BITS Pilani, K K Birla Goa Campus
• Testing of Raw Materials:
Testing of Pellets and
Testing of Powder
• Testing of Product.( Fit, Form and Function)
• Long Term Testing of RM Products.
• Advanced Tests for Material Development
Testing in Rotational Moulding
BITS Pilani, K K Birla Goa Campus
• Density
• Melt Flow Index (MFI)
• Shape, Size Colour of Pellets
• Tensile Strength / Modulus
• Flexural Modulus
• Heat Distortion Temperature (HDT)
• Environmental Stress Cracking
Resistance (ESCR)
Testing of Raw Material (Pellets):
BITS Pilani, K K Birla Goa Campus
• Dry Flow Test
• Bulk Density Test
• Sieve Analysis - Particle Size Distribution
• Microscopic View for Characterization of
Powder.
Powder Characterization
BITS Pilani, K K Birla Goa Campus
• Dimensions of Product
• Profile
• Angularity
• Depth
• Wall Thickness Distribution
• Shrinkage and Warpage
Testing of form features of the product:
BITS Pilani, K K Birla Goa Campus
• Density of part
• Tensile Strength and Modulus
• Flexural Strength and Modulus
• Low Temperature Impact Strength
• HDT
• ESCR
• Gel Cure Test (XLPE), etc.
Mechanical Properties of the product:
BITS Pilani, K K Birla Goa Campus
• Colour Testing in Light booth
• Weatherability using Xenon Arc Lamp
• Differential Scanning Calorimetry (DSC)
• Dynamic Mechanical Testing Creep Testing using DMA
• Thermal Gravimetric Analysis (TGA)
• Scanning Electron Microscopy (SEM)
• Compounding Studies using Torque Rheometer.
• Rheological Studies using Parallel Plate rheometry
A few important tests are discussed here
Long Term and Advanced Testing
BITS Pilani, K K Birla Goa Campus
• The specific gravity or density is a property
measured to:
Identify a material,
Follow physical changes in a sample,
Indicate degree of uniformity among different
sampling units or specimens.
To calculate strength-weight and cost-weight ratios.
Density
BITS Pilani, K K Birla Goa Campus
Effect of Density on Different Properties #
Density
Property
• Tensile Strength • HDT • Stiffness • Shrinkage • Hardness • Barrier
Properties • Chemical
Resistance
• Impact Strength
• ESCR • Optical
Properties • Ductility
#: Ref: R.J. Crawford, Rotational Moulding, Rapra Review Report, 71
BITS Pilani, K K Birla Goa Campus
Testing of Density
•Ref: ASTM D-792 or ISO 1183 method D.
BITS Pilani, K K Birla Goa Campus
Testing of Powder: Dry Flow and Bulk Density
Ref: Association of Rotational Molders, Test Method for Flowability and Apparent Density of Polyethylene Powders, Version 2.1 – November 2011, pp-2-8, ASTM 1895-69 with conditions redefined for use in rotational moulding
BITS Pilani, K K Birla Goa Campus
Melt Flow Index (MFI)
Schematic Dynisco MFI in Our Lab
Ref: ASTM D -1238
BITS Pilani, K K Birla Goa Campus
Effect of MFI on Different Properties #
MFI
Property
• Flow Properties e.g. Viscosity
• Impact Strength • Tensile Strength • ESCR • Weatheribility • Chemical
Resistance • Ductility
#: Ref: R.J. Crawford, Rotational Moulding, Rapra Review Report, 71
BITS Pilani, K K Birla Goa Campus
ESCR
Ref: ASTM D-1693
BITS Pilani, K K Birla Goa Campus
Testing of Tensile Properties
UTM in Lab (Load Cell 0-10 KN) Typical Stress-Strain Plot
Ref: ASTM D 638
BITS Pilani, K K Birla Goa Campus
Testing of Flexural Properties
Schematic of Flexural Testing Lab Testing Set Up
Ref: ASTM D 790
BITS Pilani, K K Birla Goa Campus
Typical Flexural Curves
Ref: ASTM D 790
BITS Pilani, K K Birla Goa Campus
Schematic of Low Temp. Impact Test
Ref: ARM Low Temperature Impact Test
BITS Pilani, K K Birla Goa Campus
HDT: Schematic and Set Up
Schematic of Flexural Testing Lab Set Up for HDT
Ref: ASTM D 648
BITS Pilani, K K Birla Goa Campus
Geometry and Form Testing: Coordinate
Measuring Machine (CMM)
Testing of product for Dimensions, Profile, Depth, Angularity, etc.
BITS Pilani, K K Birla Goa Campus
• Dynamic Mechanical Analyzer (DMA): TA Instruments USA
• Differential Scanning Calorimetry (DSC).
• Thermo gravimetric Analysis (TGA)
• Scanning Electron Microscope
• Templogger
• Injection Moulding Machine: Ferromatic Millerkon -50 T
• Compression Moulding Press-32 T
• 3-D printer for Rapid Prototyping: Make Stratasys
• ROTOSIM.
• Pro-E, ANSYS and other CAE tools.
Other Facilities at BITS GOA ( will be replaced with Photos)
BITS Pilani, K K Birla Goa Campus
Test Standard
Density ASTM D 1505/D-4883/D-792 or ISO 1183 method D.
Dry Flow and Bulk Density ASTM 1895-69 with conditions redefined for use in rotational moulding
MFI ASTM D -1238
ESCR ASTM D-1693
Tensile Strength and Modulus ASTM D 638 Type I to IV
Flexural Strength and Modulus ASTM D 790
Low Temperature Dart Impact ARM International
HDT ASTM D 648
Conclusion: Our Service Capabilities
BITS Pilani, K K Birla Goa Campus
“The best Research will give the best Teaching and the best Teaching will give the best Research” Dr. APJ Abdul Kalam.
Thanks