| 摘要 |
<p>A heat-recoverable polymeric sheet 1 is coated with a solid sheet of heat-activatable sealant 5 by heating 3 the sheet 1 preferably to a temperature above the crystalline melt point of the polymer, applying, preferably by means of a roller 6, the sealant sheet to the heated polymer sheet while the polymer sheet is at a temperature capable of activating the sealant 5 so as to adhere it to the polymer sheet 1. The polymer sheet 1 may be flame-brushed 4 after heating and before application of the sheet of sealant. The technique is particularly useful for sheets 1 intended as wrap-around sleeves for use as enclosures, and which thus have closure rails 2 adjacent opposing longitudinal edges thereof.</p> |
