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Loose piece pattern
This type of pattern is also used when the contour of the part is such that withdrawing the pattern from the mould is not possible. Hence during moulding the obstructing part of the contour is held as a loose piece by a wire after moulding is over,first the main pattern is removed and then the loose pieces are recovered through the sap generated by the main pattern (Figure.). Moulding with loose pieces is a highly skilled job and is generally expensive and therefore, should be avoided where possible.
Figure- Loose Piece Pattern
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