technology and enviroment- sustainablitiy

Our society and industry relies on large amounts of energy and the world is becoming increasingly dependent on fossil fuels [oil, gas, coal ].The industrialised nations of Western Europe and North America, China and India depend almost entirely on these fuels and the developing nations are also increasing their use.  To  reduce the amount of plastic being used in the family we can reuse plastic bottles, bags and buckets  make them into storage items.                                                                 Plastic Bottles                                                              Plastic Bags                                                            Plastic Buckets

                                         

             

lesson 10- useing the glue gun

Today we are working in the workshop on are designs. Last lesson I was working on the cookie monster, I had  already cut the shape of Layer C which was the cookies and arms. So today I had to work on Layer D. Layer D was the arms. I chose the arms as Layer D so that the cookie monster is holding the cookies. So i cut out Layer D with some sharp scissors. After I cut it out I used the glue gun to stick it on. you had to be very quick to stck it on the timber.

Procedure On aA Glue Gun

1. Turn on the power switch
2. Wait till the glue gun warms up
3. Hold the glue gun in your hand
4.  Try to squeeze some glue on cardboard tosee if it works
5. Squeeze only a little  bit of glue on to the layer
6. Then quickly place it into place 

Tips

1. Check if the power switch is on 
2. Test the glue gun before squeezeing on to your design
3. To know if the glue run out check if the glue stick is half way or full. If ti is full keep glueing. If half way get a new glue stick
4. REMEMBER TO PLACE THE LAYER QUICKLY INTO PLACE ON YOUR DESIGN

manmade boards

BLOCKBOARD - This is built up with a core of softwood strips bonded together with adhesive and covered with a sheet of plywood on either side. Used as a building material and for furniture manufacture including fitted kitchens / bedrooms.

CHIPBOARD - This is made up of small chips of wood bonded together with resin and formed into sheets by compression. It is not as strong as plywood and block board but it is not expensive. Chipboard is often covered with a plastic laminate or wood veneer and used in furniture.

HARDBOARD - This is made from wood fibres that have been pulped. The pulp is put under pressure until the fibres bond to produce a tough board that is smooth on one side and rough on the other. It is not as strong as the other boards.

thermosetplastic

The word Thermo means Greek for heat.

Thermosetting plastics soften with heat but stay soft only for a short time. They set, or harden, if the heat continues.

Once 'set' these plastics cannot be reheated to soften, shape and mould. The molecules of these plastics are cross linked in three dimensions and this is why they cannot be reshaped or recycled. The bond between the molecules is very strong.