| 摘要 |
PROBLEM TO BE SOLVED: To provide a co-extrusion device which gives means for detecting fluorescent granular substance to a raw material in an extruder, and can measure a layer thickness of a layer produced by the raw material in a film composite body; and a method for measuring a layer thickness, manufacturing a resin film, and modifying an extrusion device.SOLUTION: A co-extrusion device 1 has extruders 2, 3 and 4, a co-extrusion block 7, and feeding means for feeding from the extruders 2, 3 and 4 to the co-extrusion block 7; and includes a first extruder 2 for plasticizing a first raw material and a second extruder 3 for plasticizing a second raw material, and a detection means addition device installed for introducing and adding detection means to a layer. The detection device is provided in a machine direction in the co-extrusion block 7 and/or on an opposite side of the co-extrusion block 7. The detection means addition device which is installed for measuring the layer thickness using the detecting detection means is provided in a machine direction on an opposite side of the extruders 2, 3 and 4.SELECTED DRAWING: Figure 1 |
