Showing posts with label recycle. Show all posts
Showing posts with label recycle. Show all posts
First attempt at full size wheel
First step is to wash all the plastic and remove labels. |
I have been collecting plastic for a while. This is what 500g of HDPE looks like. |
I then weighted the plastic to that it will be enough for the size and thickness of the wheel I need. |
I then put the plastic bit by bit into an oven at 180 degrees, hot enough to melt but not burn the plastic |
I then put the motlen plastic blog on my tool and put the top on and pressed the MDF together. |
I miss calculated the weight of the plastic so this is blob is too small for me to use.
Making Plastic wheels experiment
This is a small scale test to see if its possible to make wheels for my kiosk out of recyeld plastic.
This is the equipment I will use to form the melted plastic into a flat piece. Using 2 nuts to determine the width.
The molten blob of HPDE is pushed between the MDF boards and tightened with block nuts.
I then cut the plastic into a circle using a band saw and disc sander.
The HDPE can be planed with a wood hand plane to create a smooth more even surface .
Oil experiments
Here I experimented with melting plastic using vegetable oil ( same method used to melt chocolate) in a bowl submerged in boiling water.) Got this idea from Thomas Thwaites
toaster project book, where he used this method to make the plastic
casing for his toaster.
My new equipment ( 240 degree sugar thermometer, small saucepan)
1st experiment : The silicone case flooded so let the plastic
free in the oil. Going back to white as it cooled down
I used silicone cupcake holders from pound-land because silicone has a very
high melting point (240 degrees)
Whereas HDPE, Polypropylene and polystyrene melt at around 130 degrees.
The plastic touching the casing is starting to melt
Quenching the whole mould in cool water to speed up the process.
Other testing with waste products....
This is a test to see if recycled newspaper can be formed .
Liquidised newspaper, then put in moulds in the oven.
Threads found in waste textiles bin mixed with powdered potato starch fibre and then put into moulds in the oven. Also flattened in a panini maker.
Combining plastics
Here are some experiments using different types of plastic together to see if they fuse well.
HDPE and Polypropylene fuse well together , but polystyrene doesn't stick with the
other plastics making the structure
Heat gun vs Plastic
Firstly sorting out different plastics washing and then cutting into pieces
PET bottle
HDPE milk bottle
I then made a simple mould by fly pressing aluminium and created feet by bending down the corners. I also made a tapered wooden presser.
With heat from the heat gun and pressure from the plug, I woulded the soft plastic into the mould.
HDPE plastic bag
HDPE milk bottle
All the plastics that worked with this method were PP (polypropelene), PS (polysyrene) and HDPE (high density polyethelene). The plastic that melted down the best and created the smoothest surface was PP. PS created a sort of crystal structure.
Expandable foam with bio resin
Some tests I did with bio resin and wood shavings.
I gathered 3 different types of wood shavings from the wood workshop and at different sizes.
I then graded them on expansion, hardness (top and bottom ) and residue left over.
Developing material from waste
More experiments using recycled plastic bags, bonded together by ironing and then heated with a blow torch.
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