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Performance characteristics of timbers, Timbers, Degradable polymers,…
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Timbers
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Cedar, toxic but no knots
Pine, straight grain, needs finish
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Redwood, good strength to weight ratio, outdoors
Larch, degrades in UV, high resin content
Oak, hardwearing, durable, takes finishes
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Beech, work surfaces, kids toys, food safe
Mahogany, endangered, expensive, pretty, veneer
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Degradable polymers
PLA (polylactic acid)
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Water bottles, plastic bags, plant pots
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Can be moulded, formed, extruded, 3D printed
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Lactide
Compostable, hydrodegradable
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Corn starch polymers
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Can be injection moulded, extruded, 3D printed
Biopol
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Shampoo bottles, disposable razors, lining of daipers
Good UV resistance, does not dissolve in water
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PotatoPak
Starch based, compostable, food safe
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Finishing polymers
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Overmoulding
Adds grip, texture, aesthetics
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Hydrographic printing
Images printed onto soluble film, they are floated on a tank of water and a product is pushed down onto them, the image wraps around it
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Smart materials
Thermochromic pigments
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Baby's spoons/ducks, heat
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Fish tank, kids thermometers
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Phosphorescent
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Bedroom stars, fire exit signs
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Litmus paper
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Garden soil, pool testing
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Smart materials change their properties in response to stimuli such as temperature, light, moisture, PH or stress. The changes are reversible.
Box production
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Roll of recycled paper fed into corrugater, pressed between rollers and blasted with steam
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Waste solutions
Polyside chair
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Strong, lightweight, universal
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Miniaturisation
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First phones, 30 min talk time, 10 hour charge
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Quality control
Monitoring, testing and checking the materials/components/products to check they conform to standards
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Composite materials
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Tungsten carbide
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Hard. tough, resistant to high temperatures and corrosion
Used for drill, lathe, router bits and saw blades
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Polymers
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Layup method
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Clamp and leave a GRP workpiece to cure (seal a CRP workpiece in a vacuum bag and heat in an oven to cure)
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Release from the mould, trim and finish the workpiece
Concrete
Cement powder, sand, aggregate mixed with water
High compression strength, low tensile strength, few surface defects, easy to mould, fire resistant
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A material comprised of two or more different materials resulting in a material with enhanced properties
Sustainable energy
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Tidal power
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Tidal fences, barrages and turbines are all used
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Wind
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Inconsistent on land, better in sea
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Circular economy
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Less land required for processing and raw material extraction, benefits environment
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Circular economy
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Fairtrade
Offers workers in impoverished areas better working conditions and salary along with protection from exploitation
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Woods
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Finishes
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MF laminate
Thin sheets of MF polymer, hard, tough, chemical resistant
Inclusive design
EG
Public buildings, wheelchair ramps, elevators etc
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Not only for non-able bodied people, works better for everyone
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