| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure the substantially safe strength though a bottle is formed of a recycled resin material, and to prevent the delamination even when the bottle is carelessly dropped by setting the whole interlayer wall thickness of a bottle body portion to be a value so that no deflection stress is exerted in the bottle body portion when the bottle is dropped. SOLUTION: A bottle body portion is of three-layered structure, an intermediate layer 5a is formed of a recycled material, and an innermost layer 5b and an outermost layer 5c are formed of a virgin material. The recycled material is a material obtained by recovering emptied bottles, etc., melting them, and restoring the molten material into a raw material again. Thus, a content to be stored is not brought into contact with the recycled material directly, or a hand of a user is not brought into contact with the recycled material directly, and the safety in the sanitary aspect as the recycled multi-layered resin bottle is sufficiently ensured. The whole interlayer wall thickness T of the bottle body part is set to ensure the thickness of at least 0.7 mm in which deflection stress is not exerted even under the shock when the bottle is dropped, and delamination is not caused.</p> |
