Claims
- 1. A slot die for producing webs of a foamed plastics material, comprising: a housing; and a pair of rollers arranged in the housing so as to form a die gap through which plasticized plastics material is channeled under such a pressure that foaming of the plastics material only occurs after it leaves the die gap, the pair of rollers being mounted in a laterally sealed manner in the housing of the slot die so as to prevent a pressure drop in the plasticized plastics material before it leaves the die gap, the rollers of the pair of rollers being frustoconical and displaceable axially with respect to each other so that the thickness of the die gap is set.
- 2. A slot die as defined in claim 1, wherein the pair of rollers has two sides each provided with a sealing thread that acts as a melt seal and as a lateral sealing means which acts as one of a return conveying thread and a sealing thread of an active melt seal.
Priority Claims (1)
Number |
Date |
Country |
Kind |
198 22 435 |
May 1998 |
DE |
|
Parent Case Info
This is a U.S. national stage of application No. PCT/DE99/01445, filed on May 7, 1999. Priority is claimed on that application and on the following application: Country: Germany, Application No: 198 26 363.5, Filed Jun. 12, 1998.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/DE99/01445 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/65666 |
12/23/1999 |
WO |
A |
US Referenced Citations (7)