| 摘要 |
Thermoplastic resin containing a crosslinking agent and a foaming agent is extruded through a long-land die 3 which is provided with an applicator 4 for applying lubricant onto the inner surface of the long-land. A lubricant extractor 5 for removing the lubricant and, optionally a further lubricant applicator 6, are provided downstream of the applicator 4. The crosslinking agent is decomposed in the front part 6 of the die 3 to lower the flow rate of the resin and the foaming agent is decomposed or heated to its boiling point in the rear parts 9, 10 of the die 3 to provide an expandable resin. The crosslinked, expandable resin is then released into an atmospheric or controlled pressure zone 11 to produce a uniform, finely expanded foam article. <IMAGE> |
