Flashcards in Other Manufacturing Processes Deck (33)
How are carbon fibres produced?
Heating polyacrylonitrile filaments through a range of temperatures up to 2000°C.
What is the first stage of manufacture using carbon fibre?
Carbon fibre matt is cut to shape using ceramic scissors.
What is the second stage of manufacture using carbon fibre?
-The matt is the placed into a mould half.
-Resin is added and the material is forced into the shape of the mould.
What is the third stage of manufacture using carbon fibre?
The mould halves are fixed together and cooked for 8 hours at 170°C in order to promote cross links in the resin.
What is the first stage of manufacturing a GRP product?
The mould is coated with a releasing agent.
What is the second stage of manufacturing a GRP product?
A gel coat is applied to the mould with a 1mm thickness.
What is the third stage of manufacturing a GRP product?
The gel coat and hardener are coloured in order to catalyse the gel.
Describe the process of steam bending.
-The timber is moistened until pliable.
-The wood can then be held in shape until dry
Describe the process of glass blowing.
An air bubble is blown into the glass and then enlarged to produce the final product.
What is slumping?
A process in which glass is heated until it becomes soft allowing it to take the shape of a mould.
What is a lehr?
A furnace used for annealing glass.
How is toughened glass produced?
-The glass is heated uniformly and rapidly cooled by air jets.
-The surface is then under compressive stress whilst the inside is under tension.
What is slip moulding?
The process of pouring slip into plaster of Paris moulds.
What is jiggering?
A process in which clay is rotated and moulded.
Describe the process of jiggering.
-Clay dust is spread into the lower mould.
-A hydraulic ram lowers the flexible membrane.
Give five examples of printing processes.
Give two examples of electrostatic printing processes.
What are the four process colours?
Describe the process of letterpress printing.
Raised letters are coated in ink and pressed onto the material.
What is the first stage of offset lithography?
Printing material is fed into the machine as a sheet or web-fed.
What is web-feeding?
Printing onto a continuous roll of paper.
What is the second stage of offset lithography?
-Printing plates are produced from photosensitive aluminium.
-The plates are fitted onto the machine and a test run is carried out.
What is the third stage of offset lithography?
The plate cylinder rotates onto a blanket roller which becomes coated with ink.
-The ink is then transferred onto the material.
Give an advantage of using flexography.
Poor quality materials can be printed onto.
Give two uses of screen printing.
-Transferring designs onto paper and ceramics.
-PCBs can be produced.
Give two advantages of using screen printing.
-Able to print thick deposits of ink on uneven surfaces.
-Non-impact method of printing.
Describe the process of gravure.
-A stainless steel cylinder is engraved with thousands of holes with varying depth.
-Ink collects in the holes as the cylinder rotates and excess is removed leaving only the desired image which can be printed onto the material.
Describe the process of electrostatic printing.
-The amount of toner deposited is controlled by the varying electrostatic properties.
-The toner is fixed by absorption, heat or chemical reaction.
Describe the process of inkjet printing.
Electrostatically charged ink droplets are sprayed onto the substrate.