| 摘要 |
<p>An apparatus for deforming a sheet of thermoplastic material by sequentially pressing against one face of the hot sheet of material the cold tips of projections set in and extending normally from a first series of separately moveable combs and sequentially pressing against the second face of the material the cold tips of projections set in and extending normally from a second series of separately moveable combs so that the projections in the first series of combs interpenetrate with the projections on the second series of combs in such a manner that the projections on the first series are spaced from the projections of the second series by a distance greater than the thickness of the sheet; the interpenetrated projections are substantially parallel during the act of interpenetration; and the combs of any one series form a block pressing against the sheet of thermoplastic material, wherein the block so formed by the combs of any one series has two straight parallel sides, parallel with the sides of the thermoplastic sheet and has non-linear projections running across the block having a median normal to the parallel sides of the block said projections characterised in that an envelope around any one projection overlaps with the envelope around an adjacent projection; the combs each contain one or more complete projections; and wherein the interpenetrated combs are moved along at the speed of the sheet until the sheet is set and the combs are then removed and recycled.</p> |
