| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method for a simultaneously filling hollow molding, with which a sinkmark-free hollow molding having a smooth and good surface can be obtained through the fully close contact of a parison with the cavity surface of a mold. SOLUTION: In a mold 1, in which a molding is performed by pinching both the sides of a parison with a mold body 2 and a pressure sealing mold 3, which is slidably provided above the mold body, a throttling part 12 for producing the neck part 15 of a hollow molding 13 is provided on the top part B of the mold body. By sucking the air interposing between the cavity surface 6a of the mold body 2 and the surface of the parison under the condition that both the sides of the parison 11 are pinched and, at the same time, the throttling part 12 is brought into close contact with the parison 11 by closing the mold 1, the degree of vacuum between the surfaces is heightened with one rush, resulting in bringing the parison 11 into fully close contact with the cavity surface 6a and allowing to obtain the hollow molding 13 having a good surface.</p> |
