Method of shortening the time to compression mold a roofing shingle or tile and apparatus for facilitating same
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United States of America Patent
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Feb 28, 2017
Grant Date -
Feb 14, 2013
app pub date -
Oct 16, 2012
filing date -
Dec 12, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A method of shortening cycle time required to compression mold shingle or tile is provided, wherein carrier plates are comprised of a surface material and a base, and receive a thermoplastic material, thereon. The roofing material is applied to the carrier plate and the carrier plate is subjected to induction heating, by which its surface material has its temperature raised, without substantially raising the temperature of the carrier plate base, such that the thermoplastic material applied thereto is kept heated in the compression mold. Cooling of the thermoplastic material is by heat transfer from the carrier plate surface material to the carrier plate base, and with both materials having good heat conduction capability. The carrier plate surface material has a high receptivity to being heated by induction heating relative the carrier plate base. The carrier plates are serially delivered through the process, to the compression mold.
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