| 摘要 |
A hollow multi-layer article, such as a container, is produced in an apparatus comprising a die head (10) and a number of extruders (20-23), each designated for extruding a specific material to form one or several of the layers of a multi-layer tube (40) from which the article is formed. The specific material fed to each extruder is heated to an increased temperature and is extruded through the die head to form said layers of the tube. Extruded pieces of the tube are expanded to form the article. According to the invention at least one (23) of the extruders (20-23) is fed with a plastics material having a melt flow index (MFI) different from the melt flow index of the plastics materials fed to the remaining extruders (20-22). Within the die head said material with higher melt flow index is attached to at least one of the layers formed in the die head to form at least one of the layers defining the wall of the article. By using a plastics material having a higher melt flow index for forming the inner or outer defining walls of the article an article having improved gloss is obtained. |
