Manufacturing insulation boards

摘要

A foam panel sandwich is formed by spraying foam 3 onto a continuous lower substrate 1, laying a continuous upper substrate 2 over the top, feeding the sandwich through a nip to spread the foam and then allowing the foam to expand and cure. At or just after the foam gel time and before the foam tack-free time, the upper substrate is punctured to provide a gas release pathway from the foam. Puncturing is achieved by a spiked roller 20 that periodically moves from a disengaged to an engaged position in timed relation to the movement of the panel sandwich. Also disclosed are means for cleaning the sandwich with air jets prior to passage through the nip and for cutting the continuous sandwich to discrete lengths and stacking the resultant individual panels.