DOUBLE STRUCTURE CONTAINER, ITS MANUFACTURING METHOD, AND PREFORM

To make sure that an inflow of air between an outer layer container and an inner layer container is not obstructed in a double structure container including the outer layer container that forms an outer shell of the container, and the inner-layer container that shrinks and deforms as a contained content decreases and includes a storage part that can be peeled off from the outer layer container.SOLUTION: There is provided a container 1 including: an outer layer container 2; and an inner layer container 3 including a storage portion 32 that shrinks and deforms as a stored content decreases and can be peeled off from the outer layer container 2, in which, in at least a part of an upper end side of the storage portion 32, a bulging portion 32a is formed that bulges to be folded back from a lower end of an inner mouth portion 31 toward a space between the inner mouth portion 31 and a mouth portion 21 of the outer layer container 2, and contacts the inner surface of the outer layer container 2, and the storage portion 32 is formed so as to be connected to the inner mouth portion 31, interposing the bulging portion 32a.SELECTED DRAWING: Figure 1 【課題】容器の外郭を形成する外層容器と、収容された内容物が減少するに伴って収縮変形するとともに、外層容器から剥離可能な収容部を含む内層容器とを備える二重構造容器において、外層容器と内層容器との間への空気の流入が妨げられないようにする。【解決手段】外層容器２と、収容された内容物が減少するに伴って収縮変形するとともに、外層容器２から剥離可能な収容部３２を含む内層容器３とを備える容器１において、収容部３２の上端側の少なくとも一部に、内口部３１と外層容器２の口部２１との間に向かって、内口部３１の下端から折り返すように膨出して、外層容器２の内面に接する膨出部３２ａを形し、膨出部３２ａを介して内口部３１に連接するように収容部３２を成形する。【選択図】 図１