Laminated peeling container

Abstract

To provide a delamination container in which an inner layer body can be easily delaminated not only in a trunk part but also in a heel part when a squeeze of the trunk part is released after the trunk part is squeezed to discharge a content.SOLUTION: A delamination container 1 comprises: an outer layer body 2; an inner layer body 3 peelably laminated on an inner surface of the outer layer body 2 and free in volume-reducing deformation; and an outside air introduction port 10 continuous between the outer layer body 2 and the inner layer body 3. The delamination container 1 has a bottle shape having a cylindrical mouth part 4, a shoulder part 5 continuous to the mouth part 4, a cylindrical trunk part 6 continuous to the shoulder part 5, a cylindrical heel part 7 having a diameter larger than that of the trunk part 6 and continuous to the trunk part 6 via a peripheral step part 14, and a bottom part 8 continuous to the heel part 7. A thickness t1 of the inner layer body 3 in the trunk part 6 is thicker than a thickness t2 of the inner layer body 3 in the heel part 7, and recessed parts 20 recessed toward the inside of the container are provided in the step part 14.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a laminated and peelable container including an outer layer, an inner layer that can be reduced in volume and deformed and is laminated on the inner surface of the outer layer in a peelable manner, and an outside air inlet that is continuous between the outer layer and the inner layer.

Background Art

[0002] The above laminated and peelable container is widely used as a container for storing food seasonings such as soy sauce, foods such as beverages, cosmetics such as lotions, and toiletries such as shampoos, rinses, or liquid soaps as contents. After discharging the contents to the outside, outside air can be introduced between the outer layer and the inner layer from the outside air inlet, and the inner layer can be reduced in volume and deformed in accordance with the discharge of the contents. Thereby, the contents are discharged without being replaced by outside air, contact of the outside air with the contents stored in the inner layer is suppressed, and deterioration and alteration thereof can be suppressed.

[0003] Conventionally, as such a laminated and peelable container, there is known a squeeze type having a bottle shape including a cylindrical mouth part, a shoulder part continuous with the mouth part, a cylindrical body part continuous with the shoulder part, a cylindrical heel part having a larger diameter than the body part and continuous with the body part via a circumferential step part, and a bottom part continuous with the heel part. By squeezing (pressing) the body part, the contents stored inside the container can be extruded from the mouth part to the outside and discharged (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional laminated peel-off container described above, the body is connected to the heel via a stepped section to improve the squeezeability of the body, so the inner layer is more difficult to peel off at the heel than at the body. Therefore, after squeezing the body to discharge the contents and then releasing the squeeze of the body, the inner layer peels off from the outer layer at the body preferentially to the heel, and there is a risk that the crushed portion due to this peeling will obstruct the discharge of the contents at the bottom.

[0006] The present invention has been made in view of these problems, and its objective is to provide a laminated peel-off container in which, after squeezing the body to discharge the contents and then releasing the squeeze of the body, the inner layer can be easily peeled off from both the body and the heel. [Means for solving the problem]

[0007] The laminated peeling container of the present invention comprises an outer layer, a volume-reducing and deformable inner layer laminated on the inner surface of the outer layer, and an outside air inlet connected between the outer layer and the inner layer, and is bottle-shaped having a cylindrical mouth, a shoulder connected to the mouth, a cylindrical body connected to the shoulder, a cylindrical heel that is larger in diameter than the body and connected to the body via a circumferential step, and a bottom connected to the heel, wherein the wall thickness of the inner layer in the body is greater than the wall thickness of the inner layer in the heel, and the step is provided with a recess that is recessed toward the inside of the container. Furthermore, the body portion is connected to the shoulder portion via a circumferential sub-step portion, the thickness of the inner layer in the body portion is greater than the thickness of the inner layer in the shoulder portion, and the sub-step portion is provided with a sub-recess that is recessed toward the inside of the container. It is characterized by being present.

[0008] In the laminated peeling container of the present invention, it is preferable that a plurality of the recesses are arranged in the circumferential direction in the stepped portion.

[0009] In the laminated peeling container of the present invention, it is preferable that the recess is formed in the shape of a vertical rib extending from the side of the body portion toward the side of the heel portion.

[0011] In the lamination peeling container of the present invention, it is preferable that the sub-recess is positioned so as to coincide with the circumferential position of the recess.

[0012] In the laminated peeling container of the present invention, it is preferable that the sub-recess is formed in the shape of a vertical rib extending from the shoulder portion to the body portion.

[0013] In the lamination peeling container of the present invention, it is preferable that the body portion has a plurality of longitudinal grooves arranged in the circumferential direction, extending from the shoulder portion to the heel portion.

[0014] In the laminated peeling container of the present invention, it is preferable that the outer layer and the inner layer are made of polyethylene terephthalate. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a laminated peel-off container in which, after squeezing the body to discharge the contents and then releasing the squeeze of the body, the inner layer can be easily peeled off from both the body and the heel. [Brief explanation of the drawing]

[0016] [Figure 1] This is a front view of a laminated peeling container, which is one embodiment of the present invention. [Figure 2] Figure 1 shows longitudinal cross-sectional views of the shoulder, body, and heel portions of the laminated peeling container. [Figure 3] Figure 1 is a front view of a modified example of the laminated peeling container shown in Figure 1. [Modes for carrying out the invention]

[0017] Hereinafter, with reference to the drawings, a laminated peeling container 1, which is one embodiment of the present invention, will be described in detail.

[0018] In this specification and the claims, the vertical direction means the vertical direction (the direction in which the axis O extends) in the state where the laminated peeling container 1 is in a upright posture as shown in FIG. 1, and the radial direction means the direction passing through the axis O of the laminated peeling container 1 and perpendicular to the axis O.

[0019] The laminated peeling container 1 shown in FIG. 1 is, for example, of a squeeze type that can be used for storing various contents such as food seasonings such as soy sauce or foods such as beverages, cosmetics such as lotion, and toiletries such as shampoo, rinse or liquid soap, and has a double structure having an outer layer body 2 and an inner layer body 3 made of synthetic resin respectively.

[0020] The outer layer body 2 constitutes the outer shell of the laminated peeling container 1. In the present embodiment, the outer layer body 2 has a single-layer structure made of polyethylene terephthalate (PET).

[0021] The inner layer body 3 is formed in a bag shape thinner than the outer layer body 2 and is laminated on the inner surface of the outer layer body 2 so as to be peelable. The peeling of the inner layer body 3 from the inner surface of the outer layer body 2 may be any of peeling from an adhesive state, peeling from a pseudo-adhesive state in the case of a resin laminate having no compatibility, and separation from an adhered state. The inside of the inner layer body 3 is a storage space S, and the contents can be stored in the storage space S. The inner layer body 3 is capable of being reduced in volume and deformed, that is, crushed, so as to decrease its internal volume while peeling from the inner surface of the outer layer body 2 as the contents are poured out from the storage space S to the outside. In the present embodiment, the inner layer body 3 is also made of polyethylene terephthalate (PET).

[0022] As described above, in this embodiment, the laminated peeling container 1 is made of polyethylene terephthalate in which both the outer layer 2 and the inner layer 3 are made of biaxially stretchable polyethylene terephthalate. Examples of such polyethylene terephthalate include homopolymer PET, etc., but other PETs such as IPA (isophthalic acid) modified PET or CHDM modified PET can also be used. The polyethylene terephthalate constituting the outer layer 2 and the polyethylene terephthalate constituting the inner layer 3 can have the same configuration or different configurations.

[0023] By making the outer layer 2 and the inner layer 3 of polyethylene terephthalate, the laminated peeling container 1 can be made into a lightweight, high-strength, and highly transparent container.

[0024] Note that the outer layer 2 and the inner layer 3 are not limited to being made of polyethylene terephthalate, and can also be made of other synthetic resin materials such as polypropylene (PP) or polyethylene (PE). Further, the outer layer 2 and the inner layer 3 are not limited to a single-layer structure, and may have a multi-layer structure for improving barrier properties, etc.

[0025] The laminated peeling container 1 has a bottle shape having a mouth portion 4, a shoulder portion 5 connected to the lower end of the mouth portion 4, a body portion 6 connected to the lower end of the shoulder portion 5, a heel portion 7 connected to the lower end of the body portion 6, and a bottom portion 8 connected to the lower end of the heel portion 7.

[0026] In this embodiment, the mouth portion 4 has a substantially cylindrical shape centered on the axis O, and a male thread 4a for attaching a member such as a pouring cap is integrally provided on its outer peripheral surface. Further, a neck ring 9 is integrally provided below the male thread 4a of the mouth portion 4.

[0027] The mouth portion 4 can also be configured to have a protrusion on its outer peripheral surface for undercut engagement of a member such as a pouring cap by caulking instead of the male thread 4a. Further, the mouth portion 4 can also be configured without the neck ring 9.

[0028] In this embodiment, an outside air inlet 10 is provided in the opening 4. The outside air inlet 10 is provided as a through-hole that penetrates the outer layer 2 radially through the portion of the outer layer 2 that constitutes the opening 4. The outside air inlet 10 is connected between the outer layer 2 and the inner layer 3, and as the inner layer 3 separates from the outer layer 2, outside air can be introduced between the outer layer 2 and the inner layer 3.

[0029] The shoulder portion 5 has a shape that gradually widens in diameter downwards. In this embodiment, the shoulder portion 5 is a convex dome shape that faces outwards from the container, and its cross-sectional shape perpendicular to its axis O is approximately circular.

[0030] The shoulder portion 5 can also be configured with two types of recessed ribs 11 and 12 with different shapes (in Figure 1, for convenience, only one recessed rib 11 or 12 is labeled), which are arranged alternately at equal intervals in the circumferential direction. These recessed ribs 11 and 12 are groove-shaped, each recessed toward the inside of the container and extending vertically. By providing multiple recessed ribs 11 and 12 on the shoulder portion 5, a passage for outside air can be easily formed between the outer layer 2 and the inner layer 3 from the outside air inlet 10 provided in the mouth portion 4 toward the body portion 6.

[0031] Furthermore, the shape of the shoulder portion 5 can be varied in various ways, as long as it gradually widens in diameter downwards. Also, the shoulder portion 5 can be configured without the concave ribs 11 and 12.

[0032] The body portion 6 is roughly cylindrical in shape. The body portion 6 is flexible and can be elastically deformed radially inward (towards the inside of the container) when squeezed radially inward. Furthermore, the body portion 6 is resilient and can return to its original shape from the deformed state when the squeeze is released. The laminated peeling container 1 can expel the contents stored in the storage space S from the opening 4 by squeezing (pressing) the body portion 6 toward the inside of the container. In other words, the body portion 6 is the squeeze region of the laminated peeling container 1.

[0033] In this embodiment, the body portion 6 is provided with multiple vertical grooves 6a (in Figure 1, for convenience, only one vertical groove 6a is labeled) arranged circumferentially, extending straight parallel to the axis O from the shoulder portion 5 towards the heel portion 7. This configuration makes it easier to crush the body portion 6, improving operability during squeezing, and also increases the restorative force of the body portion 6, which has been deformed radially inward by squeezing, back to its original shape. Therefore, when the squeeze is released after the contents are discharged, the body portion 6 quickly returns to its original shape, thereby improving the discharge operability of the squeeze-type laminated peel-off container 1 for discharging its contents.

[0034] Furthermore, the multiple vertical grooves 6a are not limited to a configuration that extends straight parallel to the axis O, but may also be configured to extend spirally around the axis O. Alternatively, the body portion 6 may be configured without multiple vertical grooves 6a.

[0035] In this embodiment, the outer diameter of the upper end of the body portion 6 is smaller than the outer diameter of the lower end of the shoulder portion 5, and the upper end of the body portion 6 is connected to the lower end of the shoulder portion 5 via a circumferential (annular) sub-step portion 13 centered on axis O. The sub-step portion 13 has a curved shape that gradually decreases in diameter from the shoulder portion 5 side toward the body portion 6 side and becomes convex toward the outside of the container. With this configuration, when the body portion 6 is squeezed, deformation of the sub-step portion 13 or the shoulder portion 5 together with the body portion 6 can be suppressed, thereby improving the dispensing operation of the body portion 6.

[0036] The heel portion 7 is a roughly cylindrical shape with a larger diameter than the body portion 6, and its upper end is connected to the lower end of the body portion 6 via a circumferential stepped portion 14. The stepped portion 14 gradually widens in diameter from the side of the body portion 6 towards the side of the heel portion 7 and has a curved shape that is convex outwards from the container. With this configuration, when the body portion 6 is squeezed, deformation of the stepped portion 14 or the heel portion 7 together with the body portion 6 is suppressed, thereby improving the dispensing operation of the body portion 6.

[0037] Furthermore, the heel portion 7 can be configured to have multiple (two) groove-shaped annular ribs 7a extending in the circumferential direction on its outer surface. This configuration increases the rigidity of the heel portion 7, further effectively suppressing deformation of the heel portion 7 together with the body portion 6 when the body portion 6 is squeezed, thereby further improving the discharge operability of the body portion 6.

[0038] The base 8 has an annular contact area 8a centered on axis O and a central recess 8b located inside the contact area 8a. The base 8 closes the lower end of the heel portion 7.

[0039] As shown in Figure 2, in the laminated peeling container 1, the thickness (average thickness) t1 of the inner layer 3 in the body 6 is greater than the thickness (average thickness) t2 of the inner layer 3 in the heel 7.

[0040] Furthermore, as shown in Figures 1 and 2, the stepped portion 14 provided between the body portion 6 and the heel portion 7 is provided with recesses 20 that are recessed toward the inside of the container. In this embodiment, multiple (six) recesses 20 are provided in the stepped portion 14, arranged at equal intervals in the circumferential direction. Note that only three recesses 20 are shown in Figure 1.

[0041] As shown in Figure 2, these recesses 20 have a bottom wall 20a that is flat in a vertical cross-section, and a curved peripheral wall 20b that surrounds the bottom wall 20a and connects the bottom wall 20a to the outer circumferential surface of the stepped portion 14, and are formed in the shape of vertical ribs that extend from the side of the body portion 6 toward the side of the heel portion 7. The peripheral wall 20b may be an inclined wall that extends from the outer circumferential surface of the stepped portion 14 toward the bottom wall 20a.

[0042] In the inner layer 3, if the shoulder portion 5, body portion 6, and heel portion 7 have uniform thickness, when the body portion 6 is squeezed to discharge the contents, and then the squeeze of the body portion 6 is released and the inner layer 3 deforms to reduce its volume relative to the outer layer 2, the squeezed portion, the body portion 6, may collapse first, making it impossible to discharge the contents from the heel portion 7 side. Therefore, as described above, in the laminated peel-off container 1 of this embodiment, the thickness (average thickness) t1 of the inner layer 3 in the body portion 6 is made thicker than the thickness (average thickness) t2 of the inner layer 3 in the heel portion 7. On the other hand, if the body portion 6 side is made thicker to suppress the collapse of the body portion 6 side before the heel portion 7 side, this thickening effect also occurs in the stepped portion 14, making it difficult for the inner layer 3 to peel off from the outer layer 2 at the stepped portion 14, which is the connecting portion between the body portion 6 and the heel portion 7. Therefore, as described above, in the laminated peeling container 1 of this embodiment, a recess 20 that is recessed toward the inside of the container is provided in the stepped portion 14 provided between the body portion 6 and the heel portion 7. In this way, in the laminated peeling container 1 of this embodiment, the lower end of the body portion 6 is connected to the heel portion 7 which has a larger diameter than the body portion 6 via the stepped portion 14, and the thickness t1 of the inner layer body 3 in the body portion 6 is made thicker than the thickness t2 of the inner layer body 3 in the heel portion 7, and a recess 20 that is recessed toward the inside of the container is provided in the stepped portion 14 provided between the body portion 6 and the heel portion 7. As a result, after squeezing the body portion 6 to discharge the contents, when the squeeze of the body portion 6 is released and the inner layer body 3 deforms to reduce in volume relative to the outer layer body 2, the inner layer body 3 peels off at the stepped portion 14 starting from the recess 20, and this peeling proceeds to the heel portion 7 which has a thinner wall thickness than the body portion 6, allowing it to be easily crushed, so that the inner layer body 3 can be easily peeled off at the heel portion 7 as well as the body portion 6. Therefore, even if the laminated peeling container 1 is configured with a circumferential step 14 between the body 6 and the heel 7 in order to ensure the flexibility and resilience of the body 6, the laminated peeling container 1 can be made to have improved peelability of the inner layer 3 from the outer layer 2 while maintaining the ease of dispensing the contents.

[0043] In particular, as in this embodiment, when the laminated peeling container 1 is made of polyethylene terephthalate for both the outer layer 2 and the inner layer 3, the inner layer 3 becomes difficult to peel from the outer layer 2 at the stepped portion 14. However, as in this embodiment, by making the thickness t1 of the inner layer 3 in the body portion 6 thicker than the thickness t2 of the inner layer 3 in the heel portion 7, and by providing a recess 20 in the stepped portion 14, it is possible to make it easier to peel the inner layer 3 from the outer layer 2 at the stepped portion 14, even in such a laminated peeling container 1.

[0044] Furthermore, in the laminated peeling container 1 of this embodiment, the recess 20 is formed in the shape of a vertical rib extending from the side of the body 6 toward the side of the heel 7, making it easier to peel the inner layer 3 from the outer layer 2 over the entire vertical direction of the stepped portion 14, and allowing the inner layer 3 to be peeled even more easily from the outer layer 2 at the stepped portion 14, starting from the recess 20, when the contents are discharged.

[0045] Furthermore, in the laminated peeling container 1 of this embodiment, a plurality of recesses 20 are provided on the stepped portion 14 at equal intervals in the circumferential direction. This makes it easier to peel the inner layer 3 from the outer layer 2 at multiple locations in the circumferential direction of the stepped portion 14, and when the contents are discharged, the inner layer 3 can be peeled even more easily from the outer layer 2 at the stepped portion 14.

[0046] As shown in Figure 2, the laminated peeling container 1 can also be configured such that the thickness (average thickness) t1 of the inner layer 3 in the body 6 is greater than the thickness (average thickness) t3 of the inner layer 3 in the shoulder 5, and a sub-recess 21 that is recessed toward the inside of the container is provided in the sub-step portion 13 provided between the shoulder portion 5 and the body 6. In this embodiment, a plurality (six) of sub-recesses 21 are provided in the sub-step portion 13 at equal intervals in the circumferential direction. Note that only three sub-recesses 21 are shown in Figure 1. Furthermore, these sub-recesses 21 are arranged so as to coincide with the circumferential position of the corresponding plurality (six) of recesses 20 provided in the step portion 14.

[0047] Furthermore, as shown in Figure 2, these sub-recesses 21, like the recesses 20, have a bottom wall 21a that is flat in the vertical cross-section, and a curved peripheral wall 21b that surrounds the bottom wall 21a and connects the bottom wall 21a to the outer circumferential surface of the sub-step portion 13, and are formed in the shape of vertical ribs extending from the shoulder portion 5 to the torso portion 6. Note that the peripheral wall 21b may be an inclined wall extending from the outer circumferential surface of the sub-step portion 13 toward the bottom wall 21a.

[0048] Thus, in this embodiment, the upper end of the body portion 6 is connected to the lower end of the shoulder portion 5, which has a larger diameter than the body portion 6, via a sub-step portion 13. By making the thickness t1 of the inner layer 3 in the body portion 6 thicker than the thickness t3 of the inner layer 3 in the shoulder portion 5, and by providing a sub-recess 21 that is recessed toward the inside of the container in the sub-step portion 13 provided between the shoulder portion 5 and the body portion 6, after squeezing the body portion 6 to discharge the contents, when the squeeze of the body portion 6 is released and the inner layer 3 deforms to reduce in volume relative to the outer layer 2, the inner layer 3 peels off at the sub-step portion 13 starting from the sub-recess 21. In addition, because the thickness of the shoulder portion 5 is thinner than that of the body portion 6, the inner layer 3 can be easily peeled off from the shoulder portion 5 to the body portion 6. Therefore, even if the laminated peeling container 1 is configured with a circumferential sub-step portion 13 between the shoulder portion 5 and the body portion 6 in order to ensure the flexibility and resilience of the body portion 6, the laminated peeling container 1 can be made to have improved peelability of the inner layer 3 from the outer layer 2 while maintaining the ease of dispensing the contents.

[0049] In particular, as in this embodiment, when the laminated peeling container 1 is made of polyethylene terephthalate for both the outer layer 2 and the inner layer 3, the inner layer 3 becomes difficult to peel from the outer layer 2 at the sub-step portion 13. However, as in this embodiment, by making the thickness t1 of the inner layer 3 in the body portion 6 thicker than the thickness t3 of the inner layer 3 in the shoulder portion 5, and by providing a sub-recess 21 in the sub-step portion 13, even in such a laminated peeling container 1, the inner layer 3 can be easily peeled from the outer layer 2 at the sub-step portion 13.

[0050] Furthermore, in this embodiment, the sub-recess 21 is formed in the shape of a vertical rib extending from the shoulder portion 5 towards the torso portion 6. This makes it easier to peel the inner layer 3 from the outer layer 2 over the entire vertical direction of the sub-step portion 13, and when the contents are discharged, the inner layer 3 at the sub-step portion 13 can be peeled even more easily from the outer layer 2 starting from the sub-recess 21.

[0051] Furthermore, in this embodiment, since a plurality of recesses 20 are provided on the sub-step portion 13 at equal intervals in the circumferential direction, the inner layer 3 is made easier to peel off from the outer layer 2 at multiple locations in the circumferential direction of the step portion 14, and the inner layer 3 is made even easier to peel off from the outer layer 2 at the step portion 14 when the contents are discharged.

[0052] Furthermore, in this embodiment, the multiple sub-recesses 21 provided in the sub-step portion 13 are arranged so that their circumferential positions coincide with the corresponding multiple recesses 20 provided in the step portion 14. As a result, the passage of outside air formed between the outer layer 2 and the inner layer 3, which connects to the sub-recesses 21 from the outside air inlet 10 provided in the mouth portion 4, communicates with the outer layer 2 and the inner layer 3 on the heel portion 7 side through the body portion 6 and the portion where the inner layer 3 has separated from the outer layer 2 in the recess 20, thereby making it easier to separate the inner layer 3 from the outer layer 2 at the heel portion 7.

[0053] In this case, as shown in Figure 1, it is preferable to provide a sub-recess 21 directly below the outside air inlet 10. This allows a straight passage of outside air from the outside air inlet 10 in the opening 4 to the heel portion 7, making it easier to separate the inner layer 3 from the outer layer 2 at the heel portion 7.

[0054] As shown in Figure 3 as a modified example, the laminated peeling container 1 can also be configured in which the sub-recessed portion 13 does not have a sub-recessed portion 21.

[0055] The laminated peeling container 1 with the above configuration is a blow-molded product.

[0056] In this embodiment, the laminated peeling container 1 is formed by biaxial stretch blow molding a double-layered preform assembly that combines an outer body corresponding to an outer layer 2 formed by injection molding of a synthetic resin material (polyethylene terephthalate) and an inner body corresponding to an inner layer 3 formed separately from the outer body by injection molding of a synthetic resin material (polyethylene terephthalate).

[0057] In this case, by making the thickness of the inner body in the portion that is stretched to correspond to the body portion 6 of the inner layer 3 thicker than the thickness of the portion that is stretched to correspond to the heel portion 7 of the inner layer 3, a laminated peeling container 1 can be easily formed in which the thickness t1 of the inner layer 3 in the body portion 6 is thicker than the thickness t2 of the inner layer 3 in the heel portion 7.

[0058] The laminated peeling container 1 can also be formed by biaxial stretch blow molding a laminated preform having a structure in which a synthetic resin material corresponding to the outer layer 2 and a synthetic resin material corresponding to the inner layer 3 are laminated together.

[0059] Furthermore, the laminated peeling container 1 can also be formed by extrusion blow molding (EBM), which involves blow molding a cylindrical laminated parison in which a synthetic resin material corresponding to the outer layer 2 and a synthetic resin material corresponding to the inner layer 3 are laminated using a segmented mold.

[0060] In either case, by making the thickness of the portion formed in the body portion 6 of the inner layer 3 after stretching thicker than the thickness of the portion formed in the heel portion 7 of the inner layer 3 after stretching, a laminated peeling container 1 can be easily formed in which the thickness t1 of the inner layer 3 in the body portion 6 is thicker than the thickness t2 of the inner layer 3 in the heel portion 7.

[0061] The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from its spirit.

[0062] For example, in the above embodiment, multiple recesses 20 are provided in the stepped portion 14, but the embodiment is not limited to this, and it is sufficient if at least one recess 20 is provided in the stepped portion 14. Alternatively, multiple recesses 20 may be arranged evenly or unevenly in the circumferential direction in the stepped portion 14.

[0063] Furthermore, although the shape of the recess 20 is a vertical rib shape in the above embodiment, it is not limited to this, and can be any shape as long as it is recessed toward the inside of the container. In addition, the stepped portion 14 may be provided with a protrusion that extends toward the outside of the container instead of the recess 20. In this case, the height of the protrusion toward the radially outward direction of the protrusion should be less than or equal to the maximum diameter of the heel portion 7.

[0064] Furthermore, in the above embodiment, the stepped portion 14 has a curved shape that gradually widens in diameter from the body portion 6 side to the heel portion 7 side and is convex toward the outside of the container. However, it is not limited to this, and can have various shapes, such as a curved shape that is convex toward the inside of the container, or a tapered inclined surface (cone) shape that gradually widens linearly from the body portion 6 side to the heel portion 7 side.

[0065] Furthermore, in the above embodiment, the mouth portion 4, shoulder portion 5, torso portion 6, and heel portion 7 each have a circular cross-section perpendicular to the axis O, but the invention is not limited to this, and for example, the cross-section can have other shapes such as polygons or ellipses.

[0066] Furthermore, in the above embodiment, the outside air inlet 10 is provided as a through-hole that penetrates radially through the portion constituting the mouth 4 of the outer layer 2. However, it is not limited to this, and it may be provided in any of the shoulder portion 5, torso portion 6, heel portion 7, and bottom portion 8, as long as it is a configuration that allows outside air to be introduced between the outer layer 2 and the inner layer 3. Also, its form is not limited to a through-hole, but may be slit-shaped or a gap-shaped opening at the boundary between the outer layer 2 and the inner layer 3.

[0067] Furthermore, in the above embodiment, the sub-recess 21 is positioned so that its circumferential position coincides with that of the recess 20. However, the sub-recess 21 may be positioned so that its circumferential position is offset from that of the recess 20. [Explanation of Symbols]

[0068] 1. Laminated peeling container 2 Outer body 3. Inner layer 4 Mouth 4a Male screw 5 Shoulder 6 Torso 6a Longitudinal groove 7. Heel section 7a Annular rib 8 bottom 8a Grounding part 8b Central recess 9 Neck rings 10. Outdoor air intake 11 Concave Ribs 12 Concave Ribs 13 Sub-step section 14 Stepped section 20 recesses 20a bottom wall 20b Peripheral wall 21 Sub-recess 21a Bottom wall 21b Peripheral wall O axis S storage space t1 Thick t2 thick t3 wall thickness

Claims

1. A laminated peeling container comprising an outer layer, a volume-reducing and deformable inner layer laminated on the inner surface of the outer layer, and an outside air inlet connected between the outer layer and the inner layer, The bottle has a cylindrical mouth, a shoulder portion connected to the mouth, a cylindrical body portion connected to the shoulder portion, a cylindrical heel portion that is larger in diameter than the body portion and connected to the body portion via a circumferential step, and a bottom portion connected to the heel portion. The thickness of the inner layer in the torso portion is greater than the thickness of the inner layer in the heel portion, The stepped portion is provided with a recess that is indented toward the inside of the container. The torso portion is connected to the shoulder portion via a circumferential sub-step portion, The thickness of the inner layer in the torso is greater than the thickness of the inner layer in the shoulder, A laminated peel-off container characterized in that the aforementioned sub-step portion is provided with a sub-recess that is recessed toward the inside of the container.

2. The laminated peeling container according to claim 1, wherein a plurality of the recesses are provided in the stepped portion in a circumferential direction.

3. The laminated peeling container according to claim 1 or 2, wherein the recess is formed in the shape of a vertical rib extending from the side of the body portion toward the side of the heel portion.

4. The laminated peeling container according to claim 1, wherein the sub-recess is arranged so as to coincide with the circumferential position of the recess.

5. The laminated peeling container according to claim 1 or 4, wherein the sub-recess is formed in the shape of a vertical rib extending from the shoulder portion to the torso portion.

6. The laminated peeling container according to claim 1, wherein the torso portion is provided with a plurality of longitudinal grooves arranged in the circumferential direction, extending from the shoulder portion side toward the heel portion side.

7. The laminated peel-off container according to claim 1, wherein the outer layer and the inner layer are made of polyethylene terephthalate.

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