| 摘要 |
<p>A furnace spacer (10, 30, 50, 70) for spacing a first annular prefonn (22) from a second annular preform (22) in a furnace (100), each of the first and second annular preforms (22) having an outer periphery and a width and an inner opening having a periphery and a width, the spacer (10, 30, 50, 70) having an annular body (12, 32, 52, 72) having an inner diameter and an outer diameter. Also a method of alternately stacking spacers and preforms in a furnace.
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