Rotational Moulding Technology Hand Book

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ROTATIONAL MOULDING TECHNOLOGY HAND BOOK (E-Book)

Innovative Rotomoulding

Technology of Rotational Moulding

  • Moulds
  • Types of moulds
  • Materials
  • Machines
  • Shuttle Machine
  • Carrousel
  • Rock and Roll
  • Product design
  • Design considerations
  • Parting Lines
  • Fill port for Loading
  • Drop Boxes
  • Shrinkage
  • Flatness and Stiffening
  • Radiuses and Angles
  • Venting
  • Wall Thickness
  • Spiders for Mounting
  • Recent improvements in rotational moulding
  • Quality control in rotational moulding
  • Coating and Release Systems
  • Advantages
  • Low Pressure Process
  • Unlimited Design Possibilities
  • Cost Savings
  • Rotational moulding vs blow moulding cost comparison
  • Shorter Production Times
  • Consistent Wall Thickness
  • Disadvantages
  • Applications
  • Transportation Products
  • Industrial and Commercial
  • Agricultural
  • Construction
  • Industrial Products
  • Marine Products
  • Playground Equipments
  • Recreational Products
  • Electrical/Electronics
  • Parts manufacturers using rotational moulding techniques
  • Little Tikes
  • Low and Bonar
  • Gallery of rotomoulding products
  • Toter
  • The Future of Rotational Moulding

Rotational Moulding Process

  • The process
  • Machine designs
  • Material mania
  • A Complete Life
  • Process set up
  • Design recommendations
  • Holes
  • Design of the ribs
  • Bosses
  • Kiss off
  • Wall Thickness
  • Flat Surfaces
  • Surface Finish
  • Tolerances Possible


Roto moulding Technology Details

  • Advantages of Rotomoulding
  • Disadvantages of Relational Moulding


Materials that can be Roto moulded

  • Characteristics of material for roto moulding
  • Polyolefins
  • Effects of increase in melt flow indecks
  • Vinyl plastics
  • Other plastics
  • Reactive materials
  • General information
  • Environmental Stress Cracking (ESC)


Roto moulding Machines

Design Consideration for Roto mould  Containers

  • Rotationally moulded plastic part design
  • Wall Thickness
  • Wall thickness Uniformity
  • Closely Spaced Parallel Walls
  • Warpage
  • Stiffening Ribs
  • Kiss-off Ribs
  • Draft Angles
  • Surface finish
  • Undercuts
  • Holes
  • Corner Radii
  • Tolerances

Rotational Moulding Process Control

  • Principles of process control
  • Effect of mould material
  • Effect of part thickness
  • Control of part properties
  • Impact strength
  • Bubble count
  • Processing advantages
  • Mould balancing
  • Additives
  • Machine Improvements
  • Quality control


Rotational Moulding of Nylons

  • Applications of nylon
  • Nylons suitable for rotomoulding and modifications
  • Machine considerations
  • Machine Type
  • Inert Gas Injection
  • Methods of Rotomoulding Using Nitrogen
  • Moulds and mould release coatings
  • Moulds
  • Mould release coatings
  • Moulding conditions
  • Charging the mould
  • Heating cycle
  • Cooling cycle
  • Properties of moulded nylons
  • Effect of plasticizer
  • Effect of moisture
  • Thermal considerations

Moulds Fabrication for Roto moulding

  • Complexity of form
  • Quantity of moulds required
  • The appearance of the product surface
  • The cost of the mould
  • Parting Line
  • Methods of Construction
  • Inserts
  • Special Features
  • Clamps and Clamping
  • Finish
  • Constructional features of the mould making
  • Parting Line
  • Method of Construction
  • Clamping
  • Inserts and cores
  • Fixed inserts
  • Interchangeable Inserts
  • Removable Inserts
  • Removable Threads
  • Incorrect Pitching
  • Thread shear
  • Distortion
  • Removable Handless
  • Moulded in Holes
  • Moulded in Inserts
  • Surface Finish
  • Special features
  • Heat Inducement
  • Heat exclusion
  • Kiss Points
  • Charge hoppers (Drop Box)
  • Venting
  • Mounting
  • Maintenance
  • Areas for Attention

Roto moulds for Cast Aluminium

  • Product design
  • The pattern
  • Mould design
  • Parting Lines
  • Removable Cores
  • Ribs or “Kiss-Off”
  • Moulded inserts
  • Surface finish
  • Number of pieces
  • Function and operation of mould
  • Farming
  • Spiders
  • Clamping devices
  • Heat transfer


Pin holes and Bubbles in Roto moulded Products

  • Bubble formation
  • The effect of the moulding material on bubbles
  • Melt Rheology
  • Viscosity reduction techniques
  • Powder characteristics
  • Mould considerations
  • Mould surface finish
  • Mould material
  • Mould Hot spots
  • Bubble removal using pressure
  • Pressurized rotational moulding
  • Mechanical properties
  • cycle time
  • Product thickness
  • Moulding material
  • Using pressure as a blowing agent
  • The use of a vacuum to remove bubbles
  • Effect of pressure and vacuum on the mould

Rotational Moulding of Liquid Polymers

  • Advantages to be gained when moulding liquid polymers
  • Materials for liquid polymers
  • Moulding equipments for rotomoulding liquid polymers
  • Material Handling
  • Moulds
  • Some recommendations for the rotational moulding of liquid Polymers

Powdering Thermoplastic and Quality Consideration

  • The quality of powder
  • Particle size and distribution test (ASTM D 1921)
  • Dry Flow Test (ASTM D 1895)
  • Builk density test (ASTM D 1895)
  • Characteristics and their effect on moulding
  • Particle size
  • Particle shape


Plastic Water Storage Tanks (HDPE) (Sintex Type)

  • High Density Polyethylene
  • Polypropylene
  • Poly Vinyl Chloride
  • Process of manufacture
  • Plant economics
  • Plant and Machinery
  • Fixed capital
  • Raw materials
  • Total working capital/month
  • Total capital investment
  • Turn over/annum


Suppliers of Plant and Machinery of Roto Moulding and Moulds

Engineers India Research Institute (EIRI) is a renowned name in the industrial world for offering technical and financial consultancy services.

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Our most up-to-date and Technologically Advanced Industrial Project Reports, categorized with respect to Financial Outlays and Sector – wise Classification are immensely useful for :

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