Mould Making for Glassblowing

With having a week to produce a geometric mould, I had considered various processes as to how I would create such a complex form. My original idea was to cut polyprepane plastic into sections after a vast amount of model making from paper which resulted in a form I was satisfied with.

Plaster was then poured in to the polyprepane to create a master, where I then created a one part mould using a mixture of water, fine casting plaster and flint to give the mould stability and hold together when in contact with the heat. The only issue I had with this technique is the fact the polyprepane bulged slightly, making the form's edges rounded. I was able to file these down with a surformer which gave me a better outcome, although speaking to various technicians indicated that there may be a problem getting the master out as the form is so complex.

Soft soaping the form several times and creating a 1cm clay bottom for the form to sit in meant there was a lip of the form which allowed easy access to pull away from the mould.

Other ways in which I considered was creating the geometric form on Rhino software and exploding the faces so that they lay flat in the programme which would lead to them being laser cut in to sections from 3mm acrylic of wood. These would then be stuck together with plaster being poured in which would stop the issue of bulging edges. I did attempt to produce the form for styrofoam, so plaster could be poured over the top and could pick away at the foam to leave a hollow one part mould although this was extremely unsuccesful.

Unfortunately due to it being Easter break, we now have no technical staff which means I am unable to create the steel top for my mould in order to flatten the top of the glass and therefore will go to the glassblowing session in the hope of being able to flatten the top in some other way, or changing the design slightly.


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