| 摘要 |
<p>It is intended to effectively prevent deteriorations of container performance, such as strength lowering at pinchoff area and exposure of recycled material at mouth tubular portion attributed to an increase of the ratio of recycled material employed. Accordingly, with respect to the multilayered blow container with mouth tubular portion, shoulder portion, trunk portion and bottom portion composed of at least an external layer, an internal layer and one interlayer, formed by blow molding of a tubular multilayered parison obtained by extrusion molding, the external layer and the internal layer are formed from a single synthetic resin, and the interlayer is formed from a recycled material containing as a main component the synthetic resin constituting the external and internal layers. Along the direction of parison extrusion, in a given area, there is provided a nonforming region where no interlayer exists, or a thin layer region where the interlayer is thinner in other regions.</p> |
