| 摘要 |
PURPOSE: To provide a method for continuously manufacturing siding materials by letting a foaming material to be injected into a base material be in an optimal foaming state even when a line speed of a continuous manufacturing line is changed. CONSTITUTION: An injecting position of a foaming material by a nozzle 42 of a foaming material injection machine 39 to a base material 17 is moved in a line direction by a moving frame 40 in accordance with a line speed of a continuous manufacturing line. When the line speed is low, the foaming material is injected at the downstream side in the line direction. On the other hand, when the line speed is high, the foaming material is injected at the upstream side in the line direction, so as to butt against a rear face material 44 always in an optimal foaming state. Thus, generation of defective parts which can not form a product is prevented even when the line speed is changed. |
