With a
piece made up of tack fused stringers it is important to anneal
carefully. There are a multiplicity of small contact points where
the glass is little more than laminated. This means that each piece
of glass will try to contract into itself rather than acting as a
single unit. An annealing soak and cool should be chosen to be
several times longer than its nominal thickness.
Slumping
of this piece will also need to be done carefully. First, to ensure
all the contact points can relax as soon as the thinner parts of the
stringers. Second, the weight of the piece is not as great as one of
the same size and so will not fall into the mould in the same way –
it will take longer. Third, the movement of the glass will be within
the fragile stringers so it is important to take the heat up slowly
so they can bend rather than fracture . So, fourthly, it is important
to establish a schedule that will have a slow rate of advance to the
lowest possible temperature with a long soak for a slump of the
required depth.
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