rotational moulding technology hand book

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ROTATIONAL MOULDING TECHNOLOGY HAND 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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