| 摘要 |
<p>Method and machine for forming a continuous web of a porous thermoplastic from granules of the thermoplastic containing an expanding agent, wherein the granulated material is supplied to an inlet end of an elongate moving passage (20). The material is carried through a heating zone (28) in the passage in which a heating fluid is supplied for heating the granulated material under expansion and sintering thereof to form a homogenous body of the material. The material is carried through an evacuation zone (27) in the passage before passing through the heating zone and through a vacuum zone (29) in the passage after having passed through the heating zone for stabilization of the material by reduction of the expansion pressure of the material, heating fluid being sucked from the heating zone to the evacuation vacuum zone, and the material finally is cooled under continued stabilisation thereof.
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