| 摘要 |
PROBLEM TO BE SOLVED: To economically mold a hollow molding in which an effective component is accumulated on the inner surface in high concentration and held not to fall-typically a bottle for mushroom cultivation to which an antibacterial agent adheres. SOLUTION: This bottle is a hollow molding of polypropylene, etc. For example, an antibacterial agent powder 3 is melt-bonded to the inner surface of a bottle main body. Or, a heat-melted parison is expanded in a mold by a gas blowing mechanism to obtain a hollow molding having a shape of the mold, the powder 3 is mixed into gas to be charged, and a molten parison resin on the inner surface of the hollow molding is solidified to hold the powder by fusion. |
