Rotational Moulding Technology Hand Book

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

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