JP2016030630A - Delamination container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delamination container which can easily secure an airway for passing an air hole penetrating an outer layer body in a mouth through a space formed between an outer layer body and an intermediate layer peeled from the outer layer body.SOLUTION: A delamination container 101 is formed by biaxially stretching blow-molding a preform having a laminated structure of a resin layer forming an outer layer body 3, a resin layer forming an inner layer body 4, and a resin layer forming an intermediate layer 5 through coinjection molding. A mouth 1 has an air hole 6 penetrating the outer layer body 3, and a neck ring 7 which forms a part of the outer layer body 3 and projects in a flange shape on the side of a barrel part 2 of the air hole 6. The mouth 1 has a thickness removal part 9 formed on the resin layer forming the outer layer body 3 through the coinjection molding. The thickness removal part 9 has a lower side thickness removal part 9a formed as a recessed groove part which is recessed radially inside below the neck ring 7, and an upper side thickness removal part 9b extending toward the upper part from the lower side thickness removal part 9a, to at least the vicinity of the air hole 6.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a delamination container that has a bottle shape having a body portion that is continuous with a cylindrical mouth portion, and includes an intermediate layer that can be peeled from the outer layer body between the outer layer body and the inner layer body. It is intended to facilitate the securing of an airway that allows a vent hole penetrating the outer layer body to communicate with a space formed between the outer layer body and an intermediate layer separated from the outer layer body.

  As a container for storing cosmetics such as lotion, shampoo, rinse, liquid soap, beverages, food seasonings, and the like, a delamination container called a delamination container is known (see, for example, Patent Document 1).

  Such a delamination container has a bottle shape having a body part that is continuous with a cylindrical mouth part, and includes an inner layer body that is detachably laminated on the inner surface of the outer layer body, and is accommodated in the inner layer body. The outer layer body can be poured out through the mouth, while the outer layer body is reduced in volume by introducing outside air from the outside air introduction hole provided in the outer layer body between the outer layer body and the inner layer body. The shape can be maintained. Thus, since the contents can be poured out without replacing the outside air, it is difficult to touch the contents remaining in the container with the air, and the deterioration and alteration can be suppressed.

  Conventionally, for example, polypropylene (PP) or polyethylene (PE) is an olefin-based outer layer resin material, and nylon or ethylene-vinyl alcohol copolymer has low compatibility with the outer layer resin material. Resin (EVOH), resin material for inner layer bodies such as polyethylene terephthalate (PET) and the like are co-extruded to form a cylindrical laminated parison, and one end of this laminated parison is cut off by a mold and closed. In the state, it was formed into a bottle shape by direct blow molding in which air was supplied from the other end of the laminated parison.

  In addition, the above-described delamination container has two preforms formed by co-injection molding into a laminated structure of a resin layer that forms an outer layer body, a resin layer that forms an inner layer body, and a resin layer that forms an intermediate layer. It can also be formed by axial stretch blow molding (see, for example, Patent Document 2). Here, as the resin material for forming the intermediate layer, a material that can be peeled off from the outer layer body is used. The co-injection molding is a molding method in which two or more types of resin materials are injected simultaneously using multiple nozzles, etc., and the resin is filled into the mold in layers to obtain two or more injection-molded bodies. . Thus, when forming a lamination exfoliation container by biaxial stretch blow molding of a preform, it is possible to use an olefin resin material such as PP or PE as a main material, for example, polyester such as PET. It is also possible to use a resin material.

JP 2012-116516 A JP 2014-88004 A

  By the way, in such a laminated peeling container, in order to facilitate volume-reducing deformation of the inner layer body, it is general that an initial peeling process for peeling the intermediate layer from the outer layer body in advance is performed in the manufacturing process. .

  However, when a vent for introducing outside air is provided in the mouth of a delamination container using biaxial stretching of a preform, the strength of the neck ring used as a support in the capping (closing) process of the mouth is ensured. Therefore, if a sufficient thickness of the neck ring portion of the mouth is ensured, it is difficult to secure an airway that allows the vent to communicate with the space between the outer layer body and the intermediate layer in the initial peeling process. That is, if compressed air is blown from the vent hole, the intermediate layer can be peeled from the outer layer body, but when the intermediate layer is restored, the peeled intermediate layer is separated from the outer layer body in the vicinity of the vent hole. There was a problem that the airway was blocked by close contact and the restoration of the intermediate layer was hindered.

  The present invention has been developed in view of the above-described situation, and allows a vent hole penetrating the outer layer body at the mouth to communicate with a space formed between the outer layer body and the intermediate layer peeled from the outer layer body. An object of the present invention is to provide a delamination container capable of facilitating securing an airway.

That is, the gist configuration of the present invention is as follows.
1. In a laminated peeling container having a bottle shape having a body portion continuous with a cylindrical mouth portion, and having an intermediate layer peelable from the outer layer body between the outer layer body and the inner layer body,
The delamination container is biaxially stretched by co-injection molding a preform formed in a laminated structure of a resin layer that forms the outer layer body, a resin layer that forms the inner layer body, and a resin layer that forms the intermediate layer It is formed by blow molding,
The mouth portion has a vent hole that penetrates the outer layer body, and a neck ring that forms a part of the outer layer body and protrudes in a bowl shape on the trunk portion side of the vent hole,
The mouth portion has a hollow portion formed in the resin layer forming the outer layer body by the co-injection molding, and the hollow portion is a concave groove portion recessed inward in the radial direction below the neck ring. A laminated exfoliation container, comprising: a formed lower side portion, and an upper side portion that extends upward from the lower portion to at least the vicinity of the vent hole.

  Here, in the present specification, the term “near” the air hole means that the shortest distance to the air hole is within twice the maximum opening width of the air hole, more preferably within 1 time, and even more preferably 0.5. It means an area that is less than double. Further, the “maximum opening width” means the opening width of the ventilation hole when measured in the direction in which the opening width is maximum. For example, when the ventilation hole is circular, the diameter of the circle becomes the maximum opening width, When the vent is elliptical, the major axis of the ellipse is the maximum opening width. Further, in this specification, “downward” means a direction toward the trunk side along the central axis of the mouth, and the opposite direction is upward.

2. 2. The delamination container according to 1, wherein the upper lightening portion is formed as a hollow portion that is embedded in a radially inner side of the neck ring.

3. The laminated peeling container according to 1 or 2, wherein an upper end of the lightening portion is disposed in a region other than a projection region below the vent hole.

4). 3. The delamination container according to 3, further comprising a pair of the lightening portions arranged on both sides sandwiching at least a part of a projection region below the vent hole in the circumferential direction of the mouth portion.

5. The pair of delamination containers according to 4, wherein at least a part of each of the pair of lightening portions overlaps with a projection region below the vent hole.

6). The pair of delamination containers according to 4 or 5, wherein each of the pair of lightening portions extends to a height reaching the upper end of the vent hole.

7). Each of the pair of lightening portions is a delamination container according to any one of 4 to 6, which is composed of a plurality of the lightening portions.

8). The cutout portion has a U-shape in a side view having a pair of upper ends, and the pair of upper ends are respectively disposed in a region other than a projection region below the vent hole. Peeling container.

9. The outer layer body and the inner layer body are both laminated release containers according to any one of 1 to 8 above, each made of a polyester resin.

10. The outer layer body and the inner layer body are both made of polyethylene terephthalate,
The laminated peeling container according to any one of 1 to 9, wherein the intermediate layer is made of nylon.

  According to the present invention, the mouth portion of the delamination container has a lightening portion formed in the resin layer forming the outer layer body by co-injection molding, and the lightening portion is in the radial direction below the neck ring. Since it is configured to have a lower side hollow portion formed as a concave groove portion recessed inward and an upper side hollow portion extending upward from the lower side hollow portion to the vicinity of the vent hole, It is possible to reduce the thickness of the inner layer body at the provided portion to facilitate deformation, and to easily secure the airway during the initial peeling process.

  Therefore, according to the present invention, it is easy to secure an airway that allows a vent hole penetrating the outer layer body at the mouth portion to communicate with a space formed between the outer layer body and the intermediate layer separated from the outer layer body. A delamination container that can be provided can be provided.

It is a figure which shows the lamination | stacking peeling container as a reference example roughly, (a) is a side view, (b) is AA sectional drawing of (a), (c) is the state at the time of initial peeling processing (b) It is sectional drawing shown according to this. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematically the lamination peeling container which concerns on one Embodiment of this invention, (a) is a side view, (b) is AA sectional drawing of (a), (c) is at the time of an initial stage peeling process. It is sectional drawing which shows a state according to (b). It is a figure which shows roughly the modification of the lamination peeling container shown in FIG. 2, (a) is a side view, (b) is AA sectional drawing of (a), (c) is the state at the time of an initial stage peeling process It is sectional drawing which shows according to (b). It is a figure which shows schematically the lamination peeling container which concerns on other embodiment of this invention, (a) is a side view, (b) is BB sectional drawing of (a), (c) is at the time of initial stage peeling processing It is sectional drawing which shows this state according to (b). It is a figure which shows roughly the modification of the lamination peeling container shown in FIG. 4, (a) is a side view, (b) is BB sectional drawing of (a), (c) is the state at the time of an initial peeling process It is sectional drawing which shows according to (b). (A) And (c)-(e) is a side view which shows schematically the other modification of the lamination peeling container shown in FIG. 4, respectively, (b) is the lamination peeling container shown in FIG. It is a side view which shows the other modification schematically. (A) And (b) is a side view which shows roughly the further another modification of the lamination peeling container shown in FIG. 4, respectively. (A) is a side view schematically showing a delamination container according to still another embodiment of the present invention, and (b) is a side view schematically showing a modification of the delamination container shown in (a). FIG.

  Hereinafter, with reference to FIGS. 2 to 3, the laminated peeling container 101 according to one embodiment of the present invention will be described in detail, but first, as a reference example in the case where the lightening portion 9 in the present invention is not provided. The delamination container 100 will be described with reference to FIG. In the present specification, the vertical direction means a direction along the central axis of the mouth portion 1, and “downward” means a direction toward the trunk portion 2 side along the central axis of the mouth portion 1. The opposite direction is upward.

  As shown in FIGS. 1A and 1B, a delamination container 100 as a reference example has a bottle shape having a body portion 2 that is continuous with a cylindrical mouth portion 1, and an outer layer body 3 and an inner layer body 4. An intermediate layer 5 that can be peeled from the outer layer body 3 is provided. The delamination container 100 is a preform (in the figure) formed by co-injection molding into a laminated structure of a resin layer that forms the outer layer body 3, a resin layer that forms the inner layer body 4, and a resin layer that forms the intermediate layer 5. (Omitted) is formed by biaxial stretch blow molding.

  The mouth portion 1 has a vent hole 6 that penetrates the outer layer body 3, and a neck ring 7 that forms a part of the outer layer body 3 and protrudes in a bowl shape on the trunk portion 2 side of the vent hole 6. In addition, the mouth portion 1 has a screw portion 8 for attaching a pouring stopper (not shown) for pouring the contents accommodated inside the inner layer body 4. In addition, you may make it attach to the opening part 1 with the mounting | wearing cap of the pump apparatus which discharges an internal solution from a nozzle instead of a pouring stopper, for example. Further, an undercut portion may be provided instead of the screw portion 8 and attached by fitting the undercut portion.

  When performing an initial peeling process on such a laminate peeling container 100, first, as shown in FIG. 1 (c), for example, a rod S is inserted into the vent hole 6, and the intermediate layer 5 is directed toward the inside of the container. By thrusting, it is necessary to deform the intermediate layer 5 and the inner layer body 4 so as to curve toward the inside of the container. However, in the delamination container 100 as described above, since the thickness of the inner layer body 4 in the region from the vent hole 6 to the trunk portion 2 is relatively large, only the portion protruding by the rod S can be deformed. Therefore, after that, if compressed air is blown from the vent hole 6, the intermediate layer 5 can be peeled off from the outer layer body 3, but when the intermediate layer 5 is restored, it is peeled off in the vicinity of the vent hole 6. The intermediate layer 5 is in close contact with the outer layer body 3 to block the airway, and the recovery of the intermediate layer 5 is prevented.

  Therefore, as shown in FIGS. 2A and 2B, in the delamination container 101 according to an embodiment of the present invention, the mouth portion 1 is a resin that forms the outer layer body 3 by co-injection molding of a preform. It is constituted so as to have a hollow portion 9 formed in the layer. Further, the lightening portion 9 includes a lower side lightening portion 9a formed as a concave groove portion recessed inward in the radial direction below the neck ring 7, and at least the vent hole 6 from the lower side lightening portion 9a upward. It has the upper side thinning part 9b extended to the vicinity. In the present embodiment, the upper thinned portion 9 b is formed as a hollow portion that enters into the inside of the neck ring 7 in the radial direction.

  The term “near” the vent hole 6 means that the shortest distance to the vent hole 6 is within twice the maximum opening width of the vent hole 6, more preferably within one time, and even more preferably within 0.5 times. Means an area. The “maximum opening width” means the opening width of the vent hole 6 when measured in the direction in which the opening width is maximum. For example, when the vent hole 6 is circular, the diameter of the circle is the maximum opening width. When the vent hole 6 is elliptical, the major axis of the ellipse is the maximum opening width.

  In the present embodiment, as shown in FIG. 2A, the shortest distance to the vent hole 6 is about 0.6 times the diameter of the circular vent hole 6. It extends to the position. Further, the lightening portion 9 is arranged at a position aligned with the center of the vent hole 6 in the circumferential direction of the mouth portion 1.

  Moreover, it is preferable that all of the outer layer body 3 and the inner layer body 4 are made of a polyester-based resin such as polyethylene terephthalate (PET). Furthermore, the intermediate layer 5 is preferably made of a resin having low compatibility with a polyester-based resin, such as nylon or EVOH. Further, in this embodiment, the vent hole 6 is formed by punching the outer layer body 3 with a punch cutter while the preform after the injection molding is warm. It can also be formed by molding.

  According to the delamination container 101 according to an embodiment of the present invention having such a configuration, when forming a preform by co-injection molding, it is possible to reduce the thickness of the inner layer body in the portion where the lightening portion 9 is provided. it can. Therefore, when performing the initial peeling process, the rod S as shown in FIG. 1C is inserted into the vent hole 6, and the intermediate layer 5 is projected toward the inside of the container, as shown in FIG. 2C. In addition, it is easy to secure the airway P by further bending and deforming the intermediate layer 5 and the inner layer body 4. In addition, since the airway P is secured in this way, when an outlet plug or the like is attached to the mouth portion 1 of the delamination container 101 filled with the contents and the contents are discharged, the intermediate layer is smoothly filled. 5 and the inner layer body 4 can be peeled off from the outer layer body 3 to be contracted and deformed. Further, since the upper portion 9b is formed as a hollow portion in which the upper portion 9b sinks inward in the radial direction of the neck ring 7, it is possible to suppress a decrease in strength of the mouth portion 1.

  Further, as a modification of the delamination container 101 shown in FIG. 2, as shown in FIGS. 3 (a) and 3 (b), the upper side lightening part 9 b ′ of the lightening part 9 ′ is closer to the vent hole 6. By setting it as the structure extended to a position, as shown in FIG.3 (c), securing of the airway P can be made easier. In the delamination container 101 ′ shown in FIG. 3, the upper thinning portion 9b ′ of the thinning portion 9 ′ has a position where the shortest distance to the vent hole 6 is about 0.1 times the diameter of the circular vent hole 6. It extends to. Further, the thinned portion 9 ′ is disposed at a position aligned with the center of the vent hole 6 in the circumferential direction of the mouth portion 1.

Next, with reference to FIGS. 4-5, the lamination peeling container 102 which concerns on other embodiment of this invention is illustrated and demonstrated in detail.
In the delamination containers 101 and 101 ′ described above with reference to FIGS. 2 to 3, the upper ends T of the thinned portions 9 and 9 ′ are disposed in the projection area below the vent hole 6. In the delamination container 102 according to the embodiment, the upper end T of the lightening portion 10 is disposed in a region other than the projection region below the vent hole 6. Further, the lightening portions 10 are provided as a pair of lightening portions 10 respectively disposed on both sides of the projection region at the lower part of the vent hole 6 sandwiching in the circumferential direction of the mouth portion 1.

  For example, when the preform of the delamination container 101 described above with reference to FIG. 2 is co-injection-molded, the flow of the resin material from the bottom portion to the mouth portion joins above the upper end T of the meat removal portion 9, A weld line W (see an imaginary line in FIG. 2) extending upward from the upper end T of the thinned portion 9 is formed above the punched portion 9. For this reason, as shown in FIG. 2, when the upper end T of the thinned portion 9 is disposed in the projection region below the vent hole 6, the thinned portion 9, the weld line W, and the vent hole 6 that become weak portions. Will be continuous in the vertical direction, which is not preferable for securing the strength against the impact load or the like on the mouth portion 1.

  Therefore, in the present embodiment, the upper end T of the lightening portion 10 is disposed in a region other than the projection region below the vent hole 6. As in the case of the above-described embodiment, each of the pair of lightening portions 10 includes a lower lightening portion 10a formed as a concave groove portion recessed inward in the radial direction below the neck ring 7, and the lower meatus It has the upper side hollow part 10b extended at least to the vicinity of the vent hole 6 toward upper direction from the punch part 10a. Further, the upper part 10b of the pair of parting portions 10 is formed as a hollow part that sunk into the radially inner side of the neck ring 7, and the shortest distance to the vent hole 6 is the circular vent hole 6. It extends to a position about 0.3 times the diameter. Furthermore, at least a part of each of the pair of lightening portions 10 overlaps a projection region below the vent hole 6.

  Other configurations of the delamination container 102 according to the present embodiment are the same as those of the delamination containers 101 and 101 ′ according to the embodiment described above with reference to FIGS.

  According to such a configuration, as in the case of the embodiment described above with reference to FIGS. 2 to 3, when the initial peeling process is performed, the intermediate layer 5 and the inner layer body 4 are further separated as shown in FIG. It becomes easy to secure the airway P by greatly bending and deforming. In addition, since the airway P is secured in this way, when an outlet plug or the like is attached to the mouth portion 1 of the delamination container 102 filled with the contents and the contents are discharged, the intermediate layer is smoothly filled. 5 and the inner layer body 4 can be peeled off from the outer layer body 3 to be contracted and deformed. In addition, since one airway P can be formed at each of the positions corresponding to the pair of lightening portions 10, the intermediate layer 5 and the inner layer body 4 can be separated and contracted due to the discharge of the contents. It can be made smoother.

  As a modification of the delamination container 102 shown in FIG. 4, as shown in FIGS. 5 (a) and 5 (b), as shown in FIGS. By setting it as the structure extended to the approached position, as shown in FIG.5 (c), securing of the airway P can be made easier. In the delamination container 102 ′ shown in FIG. 5, the upper side lightening part 10 b ′ of the lightening part 10 ′ is located at a position where the shortest distance to the air hole 6 is about 0.1 times the diameter of the circular air hole 6. It extends to. Further, each of the pair of lightening portions 10 ′ extends to a height reaching the upper end of the vent hole 6.

  Further, as a modification of the delamination container 102 ′ shown in FIG. 5, as shown in FIG. 6 (a), a pair of lightening portions 10 ′ are provided at least in the projection area below the vent hole 6, respectively. You may comprise so that a part may overlap. Further, in the embodiment described above with reference to FIGS. 2 to 5 and 6A, the lateral width of the thinned portions 9, 9 ′, 10, 10 ′ can be adjusted as appropriate, for example, FIG. ) To (e) can also be set.

  Further, as a modification of the embodiment shown in FIGS. 6D and 6E, as shown in FIGS. It can also be set as the structure which consists of the lightening part 10 ', and ensuring of the airway P can be made easier by setting it as such a structure.

Next, with reference to FIG. 8, the lamination peeling container 103 which concerns on further another embodiment of this invention is illustrated and demonstrated in detail.
In the delamination containers 101 and 101 ′ described above with reference to FIGS. 2 to 3, the upper ends T of the thinned portions 9 and 9 ′ are disposed in the projection area below the vent hole 6. In the delamination container 103 according to the embodiment, the upper end T of the lightening portion 11 is disposed in a region other than the projection region below the vent hole 6. More specifically, the lightening portion 11 has a U-shape in a side view having a pair of upper ends T, and the pair of upper ends T are respectively disposed in regions other than the projection region below the vent hole 6. Has been.

  As described above, for example, in the case of the delamination container 101 described above with reference to FIG. 2, when the upper end T of the lightening portion 9 is disposed in the projection region below the vent hole 6, The thinned portion 9, the weld line W and the vent hole 6 are connected in the vertical direction, which is not preferable for securing the strength against the impact load on the mouth portion 1. Therefore, in the present embodiment, the pair of upper ends T of the lightening portions 11 are respectively disposed in regions other than the projection region below the vent hole 6.

  Other configurations of the delamination container 103 according to the present embodiment are the same as those of the delamination containers 101 and 101 ′ according to the embodiment described above with reference to FIGS.

  According to such a configuration, as in the case of the embodiment described above with reference to FIGS. 2 to 3, when the initial peeling process is performed, the intermediate layer 5 and the inner layer body 4 are further bent and deformed to secure the airway P. Easy to do.

  Moreover, as a modification of the delamination container 103 shown in FIG. 8A, as shown in FIG. 8B, a pair of upper ends T of the lightening portions 11 ′ reach the upper ends of the vent holes 6, respectively. It can also be configured to extend to a height.

  In each of the embodiments described above with reference to FIGS. 2 to 8, when forming the airway P for performing the initial peeling process, the intermediate layer 5 when struck by the rod S (see FIG. 1C). In order to make deformation of the inner layer body 4 easier, a cylindrical core heated to 80 ° C. to 200 ° C. is inserted into the mouth portion 1, so that the intermediate layer 5 and the inner layer body 4 have a glass transition temperature of 90 to 90 ° C. It is preferable to warm to about ° C. When the intermediate layer 5 and the inner layer body 4 are warmed and deformed in this manner, the deformed intermediate layer 5 and inner layer body 4 are not restored at a temperature lower than the glass transition temperature. Can be easily. The deformation amount of the portion projected by the rod S (the amount of displacement of the mouth portion 1 inward in the radial direction) is about 0.5 to 2.5 mm when the inner diameter of the mouth portion 1 is 21.7 mm. It is preferable.

  The above description shows only one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the vent holes 6 are provided at two locations sandwiching the axial center with respect to the mouth portion 1, and the lightening portions 9, 9 ′, 10, 10 ′, 11, 11 respectively corresponding to the two vent holes 6. However, instead of this, for example, only one or three or more vent holes 6 may be provided. Moreover, although it is preferable to form the upper side hollow part 9b as a cavity part which sunk in the radial inside of the neck ring 7, it can replace with this and can also be formed as a ditch | groove part dented in a radial direction inner side. In this case, the neck ring 7 has a notch corresponding to the concave upper groove 9b.

100, 101, 101 ', 102, 102', 103, 103 'Lamination peeling container 1 Mouth part 2 Body part 3 Outer layer body 4 Inner layer body 5 Intermediate layer 6 Vent hole 7 Neck ring 8 Screw part 9, 9' Meat removal part 9a, 9a 'Lower side lightening part 9b, 9b' Upper side lightening part 10, 10 'Thinning part 10a Lower side lightening part 10b, 10b' Upper side lightening part 11, 11 'Thinning part S Rod P Airway T Upper end of meat removal part W Weld line

Claims (10)

In a laminated peeling container having a bottle shape having a body portion continuous with a cylindrical mouth portion, and having an intermediate layer peelable from the outer layer body between the outer layer body and the inner layer body,
The delamination container is biaxially stretched by co-injection molding a preform formed in a laminated structure of a resin layer that forms the outer layer body, a resin layer that forms the inner layer body, and a resin layer that forms the intermediate layer It is formed by blow molding,
The mouth portion has a vent hole that penetrates the outer layer body, and a neck ring that forms a part of the outer layer body and protrudes in a bowl shape on the trunk portion side of the vent hole,
The mouth portion has a hollow portion formed in the resin layer forming the outer layer body by the co-injection molding, and the hollow portion is a concave groove portion recessed inward in the radial direction below the neck ring. A laminated exfoliation container, comprising: a formed lower side portion, and an upper side portion that extends upward from the lower portion to at least the vicinity of the vent hole.   2. The delamination container according to claim 1, wherein the upper lightening portion is formed as a hollow portion that sunk into a radially inner side of the neck ring.   3. The delamination container according to claim 1, wherein an upper end of the lightening portion is disposed in a region other than a projection region below the vent hole.   4. The delamination container according to claim 3, wherein the delamination container according to claim 3 has a pair of said thinning portions respectively arranged on both sides sandwiching at least a part of a projection area below said vent hole in a circumferential direction of said mouth portion.   5. The delamination container according to claim 4, wherein at least a part of each of the pair of lightening portions overlaps with a projection region below the vent hole.   6. The delamination container according to claim 4, wherein each of the pair of lightening portions extends to a height reaching an upper end of the vent hole.   Each of the pair of lightening portions is a multi-layer peeling container according to any one of claims 4 to 6, which is composed of a plurality of the lightening portions.   The said lightening part comprises the U-shape by the side view which has a pair of upper end, and this pair of upper end is each arrange | positioned in areas other than the projection area | region below the said air vent. The laminated peeling container as described.   The laminated outer container according to any one of claims 1 to 8, wherein each of the outer layer body and the inner layer body is made of a polyester resin. The outer layer body and the inner layer body are both made of polyethylene terephthalate,
The delamination container according to any one of claims 1 to 9, wherein the intermediate layer is made of nylon.

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