| 摘要 |
A hydraulic unit for a waterbed mattress is provided, along with a method for constructing the unit. The usual lower sheet having a plurality of chambers is covered with the usual upper sheet, and the fibrous bat is placed over the upper sheet. The assembly can be welded together, and plastic from the lower and upper sheets encases the fibrous bat to hold the bat to the hydraulic unit. The upper sheet, which is normally thin, should have about the same thickness as the lower sheet to prevent degradation. Otherwise, the upper sheet can remain thin, and a porous sheet is interposed, so the plastic from the lower and upper sheets flows through the porous sheet and encases the fibrous bat without degrading the thin upper sheet.
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