DT Flashcards
What’s the Process to make Paper
Pulping
What is pulping
Boiling up the wood to make pulp
What is the wood pulp called
Cellulose Fibres
What Is pulping
Turning a raw materials into a useable product
What are 2 ways you can make wood into wood pulp
By machine
By Chemicals
What is Mechanical Pulp
Cheapest way to produce wood pulp
Low Quality
Used for newspapers
Does not remove Lignin (turns yellow over time
What is chemical pulp
Uses less energy
Are dissolved in a chemical by heat and pressure
Removes Lignin
What happens once you have wood pulp
It’s bleached and fed into a FOURDRINIER machine
What is Composites
A product made from more than one material
What is offset lithography
Most commonly used product in the printing industry
The image is transferred onto a flat printing plate
Great for printing more than 1000 copies or more
What is MDF
Smooth even finish,easily machined,painted,stained,water/fire resistant forms available
What is Plywood
Very strong board
Constructed of layers of veneer glued 90 degrees to each other
What is Block board
Similar to plywood but central layer made from strips of timber
Used in heaven structure
E.G shelving and worktops
What is malleable
Being able to bend without breaking
What is ductility
Being able to be stretched without breaking
What is Elasticity
To return to its original condition after being stretched
What is Linear motion
Moving one way in a straight line
Reciprocating motion
Moving backwards and forwards in a straight line
What is Oscillating motion
Moving backwards and forwards in one arc
What is Rotary motion
Moving in a circle
What are gears
Used to change the direction of motion
Or change the magnitude (size) of the input force
Using a Third gear is called
Idler gear makes both turn in same direction
What are smart materials
They change their properties when their environment changed
What are Shape Memory Alloys
Metal alloys with memory properties
They return to original condition through heating
Nitinol is an SMA
What is Thermochromic Pigments
Change colour when there’s a change in temperature
What is Photochromic Pigments
Change colour depending on light levels
What are the 6rs
Rethink
Refuse
Repair
Reduce
Recycle
Reuse
What is Renewable Energy
Non finite
Energy that can be replenished
Wind energy
Wind turbines energy convert into electricity
Pros:No greenhouse gas.Once set up energy is cheap
Cons:Setup cost are high.Turbines are unreliable and unsightly and cause noise pollution
Solar energy
Convert sun energy into electricity
Pros:No greenhouse gases.Once set up energy is cheap
Cons:No electricity is available in no sunlight.Very expensive
Tidal
Turbines convert energy from tides and water currents Into electricity
Pros:Always predictable and produce no greenhouse gas
Cons:Costly and can disrupt ecosystems
Hydro electric
As trapped water is released from dams its kinetic energy is released into electricity
Pros:Once set up HE is cheap.Provides resources during water shortages
Cons:Set up cost are high.When they are built habitats are destroyed
Biomass
Organic material such as animal waste or crops are burned for energy or processed into biofuel
Pros:Very affordable and renewable if resources we replaced
Cons:Burning biomass released Co2.Using wolf can lead to deforestation
What are fossil fuels
Are non renewable natural resources formed from the remains of organisms
Pros of fossil fuels
Generates large amount of energy
Provides a reliable supply of energy
Cons of fossil fuels
Releases greenhouse gases which cause pollution and contribute to global warming
Will eventually run out
What is Built-in obsolescence
Products that are not built to past
E.g disposable razors
Why is built in obsolescence bad for the environment
More materials and energy are used to make replacement product.
What is Fair Trade
Ensuring that farmers in low income countries get a fair price to their product
What is Cooperative
A business that is owned and run by its workers or members.
What is Crowdfunding
Enabling individuals or businesses to promote an idea on a platform,such as a website,to a large audience.People can then choose to invest money in projects they like
What is Virtual marketing and retailing
The increased use of advertising online such as social media adverts and pay-per-click advertising
What is JIT production
When products arrive when needed
Pros Of JIT
Saves space
No need to pay for storage-money
Stock is less likely to go out of date
Cons of JIT
Delivery could be late
Could deliver wrong part
Increased transport costs
What is quality control
Checks quality of the product.Mostly done at every stage.
Involves testing materials products or components against the manufacturing.
What is Tolerance
The required accuracy of a measurement
What is a reference point
Spoilt where all measurements are taken
What are the rules of one point perspective
Draw the front face of the object first
Vertical edges are shown as vertical lines
Horizontal edges are shown as horizontal lines
All other lines go to the vanishing point on the horizon
What are exploded diagrams used for
To show how parts of a product fit together
