JP2024034468A - Delamination container - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a laminated peelable container including an outer layer body, an inner layer layered on the inner surface of the outer layer body so as to be peelable and deformable to reduce volume, and an outside air inlet connected between the outer layer body and the inner layer body.

The above-mentioned laminated peelable container is widely used as a container for storing food such as food seasonings such as soy sauce or drinks, cosmetics such as lotion, toiletries such as shampoo, conditioner, or liquid soap, etc. . After discharging the contents to the outside, the laminated container can introduce outside air between the outer layer body and the inner layer body from the outside air inlet to reduce the volume of the inner layer body in accordance with the discharge of the contents. . Thereby, the contents are discharged without being replaced with outside air, thereby suppressing contact of outside air to the contents stored in the inner layer body, and suppressing deterioration and deterioration of the contents.

Conventionally, such a laminated peelable container has a cylindrical opening, a shoulder connected to the opening, a cylindrical body connected to the shoulder, and a circumferential cylindrical body with a diameter larger than the body. The bottle shape has a heel part connected to the body part through a step part, and a bottom part connected to the heel part, and by squeezing (pressing) the body part, the contents stored inside the container can be removed. A squeeze type device is known that can be expelled by pushing out the liquid from the mouth (for example, see Patent Document 1).

JP 2021-41989 Publication

However, in the above-mentioned conventional laminated peelable container, the body is connected to the heel part via a stepped part in order to improve the squeezeability of the body, so the inner layer is more easily peelable at the heel than at the body. It's getting harder to do. Therefore, after squeezing the body and discharging the contents, when the squeeze of the body is released, the inner layer peels off from the outer layer preferentially at the body than at the heel, and this peeling causes the body to collapse. There was a problem in that there was a risk that the portion at the bottom could obstruct the discharge of the contents on the bottom side.

The present invention has been made in view of such problems, and its purpose is to squeeze the torso and discharge the contents, and then release the squeeze on the torso and the heel part together with the torso. Another object of the present invention is to provide a laminated peelable container whose inner layer can be easily peeled off.

The laminated peelable container of the present invention includes an outer layer body, a volume-reducing and deformable inner layer body that is peelably laminated on the inner surface of the outer layer body, and an outside air inlet connected between the outer layer body and the inner layer body. A laminated peelable container comprising a cylindrical mouth, a shoulder connected to the mouth, a cylindrical body connected to the shoulder, and a cylindrical body having a diameter larger than the body. It has a bottle shape having a heel part connected to the body part via a circumferential step, and a bottom part connected to the heel part, and the thickness of the inner layer body in the body part is equal to the thickness of the inner layer body in the heel part. The container is thicker than the body, and the stepped portion is provided with a recessed portion that is recessed toward the inside of the container.

In the laminated peelable container of the present invention, in the above configuration, it is preferable that a plurality of the recesses are provided in the stepped portion in a line in the circumferential direction.

In the laminated peelable container of the present invention, in the above configuration, it is preferable that the recessed portion is formed in the shape of a vertical rib extending from the body side toward the heel portion side.

In the laminated peelable container of the present invention, in the above configuration, the body portion is connected to the shoulder portion via a circumferential sub-step portion, and the thickness of the inner layer body in the body portion is equal to the thickness of the inner layer body at the shoulder portion. It is preferable that the sub-step portion is provided with a sub-recess that is thicker than the inner layer and is recessed toward the inside of the container.

In the above structure of the laminated peelable container of the present invention, it is preferable that the sub-recessed portion is arranged so as to coincide with the circumferential position of the recessed portion.

In the laminated peelable container of the present invention, in the above configuration, it is preferable that the sub-recessed portion is formed in the shape of a vertical rib extending from the shoulder side toward the body side.

In the laminated peelable container of the present invention, in the above structure, it is preferable that a plurality of longitudinal grooves are provided in the body section in a circumferential direction, extending from the shoulder section side toward the heel section side.

In the laminated peelable container of the present invention, in the above configuration, it is preferable that the outer layer body and the inner layer body are made of polyethylene terephthalate.

According to the present invention, when the body is squeezed and the contents are discharged and the squeeze of the body is released, the inner layer can be easily peeled off from the heel as well as the body. can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the lamination peeling container which is one embodiment of this invention. FIG. 2 is a longitudinal cross-sectional view of the shoulder, body, and heel portions of the delaminated container shown in FIG. 1; FIG. 2 is a front view of a modification of the laminated peelable container shown in FIG. 1;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated and peelable container 1 according to an embodiment of the present invention will be explained in detail below with reference to the drawings.

In this specification and claims, the vertical direction refers to the vertical direction (direction in which the axis O extends) when the laminated releasable container 1 is in an upright position, as shown in FIG. The direction is defined as a direction passing through the axis O of the laminated container 1 and perpendicular to the axis O.

The laminated peelable container 1 shown in FIG. 1 stores various contents such as food such as food seasonings or drinks such as soy sauce, cosmetics such as lotion, and toiletries such as shampoo, conditioner, or liquid soap. It is of a squeeze type that can be used for various purposes, and has a double structure having an outer layer 2 and an inner layer 3 each made of synthetic resin.

The outer layer body 2 constitutes the outer shell of the laminated container 1. In this embodiment, the outer layer body 2 has a single layer structure made of polyethylene terephthalate (PET).

The inner layer 3 is formed into a bag shape and is thinner than the outer layer 2, and is removably laminated on the inner surface of the outer layer 2. Peeling of the inner layer 3 from the inner surface of the outer layer 2 may be any of peeling from an adhesive state, peeling from a pseudo-adhesive state in the case of an incompatible resin laminate, or separating from a close contact state. The inside of the inner layer body 3 is a storage space S, and contents can be stored in the storage space S. As the contents are poured out from the storage space S, the inner layer body 3 is peeled from the inner surface of the outer layer body 2 and can be deformed to reduce its volume, that is, collapse so as to reduce its internal volume. In this embodiment, the inner layer body 3 is also made of polyethylene terephthalate (PET).

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

By making the outer layer body 2 and the inner layer body 3 made of polyethylene terephthalate, the laminated releasable container 1 can be made into a lightweight container with high strength and high transparency.

Note that the outer layer body 2 and the inner layer body 3 are not limited to being made of polyethylene terephthalate, but may also be made of other synthetic resin materials such as polypropylene (PP) or polyethylene (PE). Further, the outer layer body 2 and the inner layer body 3 are not limited to a single layer structure, but may have a multilayer structure to improve barrier properties and the like.

The laminated peelable container 1 includes a mouth portion 4, a shoulder portion 5 continuous to the lower end of the mouth portion 4, a body portion 6 continuous to the lower end of the shoulder portion 5, a heel portion 7 continuous to the lower end of the body portion 6, and a heel portion 7. It has a bottle shape with a bottom part 8 connected to the lower end of the bottle.

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

The mouth portion 4 may also have a configuration in which a protrusion is provided on the outer circumferential surface of the mouth portion 4 in place of the male thread 4a, with which a member such as a spouting cap is engaged with an undercut by plugging. Furthermore, the mouth portion 4 may be configured without the neck ring 9.

In this embodiment, an outside air introduction port 10 is provided in the mouth portion 4 . The outside air introduction port 10 is provided as a through hole that penetrates the outer layer body 2 in the radial direction at a portion that constitutes the mouth portion 4 of the outer layer body 2 . The outside air inlet 10 is connected between the outer layer 2 and the inner layer 3, and introduces outside air between the outer layer 2 and the inner layer 3 as the inner layer 3 is separated from the outer layer 2. can do.

The shoulder portion 5 has a shape whose diameter gradually increases downward. In this embodiment, the shoulder portion 5 has a dome shape that is convex toward the outside of the container, and its cross section perpendicular to the axis O is approximately circular.

The shoulder portion 5 has two types of concave ribs 11 and 12 having different shapes (in FIG. 1, only one concave rib 11 and 12 is labeled with a reference numeral for convenience), which are arranged alternately in the circumferential direction. It is also possible to have a configuration in which they are arranged at equal intervals. These concave ribs 11 and 12 each have a groove shape that is concave toward the inside of the container and extends in the vertical direction. By providing a plurality of concave ribs 11 and 12 on the shoulder portion 5, outside air is drawn between the outer layer body 2 and the inner layer body 3 from the outside air introduction port 10 provided in the mouth portion 4 toward the body portion 6. passages can be easily formed.

Note that the shape of the shoulder portion 5 can be changed in various ways as long as it has a shape that gradually expands in diameter toward the bottom. Furthermore, the shoulder portion 5 may be configured without the concave ribs 11 and 12.

The body portion 6 has a substantially cylindrical shape. The body 6 has flexibility and can be elastically deformed radially inward (inside the container) by being squeezed (pressed) radially inward. Further, the body portion 6 has restorability, and can be restored to its original shape from the deformed state when the squeeze is released. By squeezing (pressing) the body 6 toward the inside of the container, the laminated peelable container 1 can push out and discharge the contents stored in the storage space S to the outside from the mouth 4. That is, the body portion 6 serves as a squeeze region of the laminated and peelable container 1.

In this embodiment, a plurality of vertical grooves 6a (in FIG. Only the grooves 6a are labeled with a reference numeral.) are arranged in the circumferential direction. Such a configuration makes it easier to crush the trunk 6 and improves the operability when squeezing, and also reduces the force of the trunk 6 deformed radially inward due to squeezing to return to its original shape. can be increased. Therefore, when the squeeze is released after discharging the contents, the body 6 is quickly restored to its original shape, and the squeeze-type laminated peelable container 1 is used for discharging the contents. Operability can be improved.

Note that the plurality of longitudinal grooves 6a are not limited to a configuration in which they extend straight in parallel to the axis O, but may be configured to extend in a spiral shape with the axis O as the center. Moreover, it is good also as a structure which does not provide the plurality of longitudinal grooves 6a in the trunk|drum 6.

In this embodiment, the outer diameter of the upper end of the trunk 6 is smaller than the outer diameter of the lower end of the shoulder 5, and the upper end of the trunk 6 is attached to the lower end of the shoulder 5 in a circumferential shape ( They are connected via an annular sub-step portion 13. The sub-step portion 13 has a curved shape that gradually reduces in diameter from the shoulder portion 5 side toward the body portion 6 side and is convex toward the outside of the container. With such a configuration, when the body 6 is squeezed, the sub-step portion 13 or the shoulder portion 5 can be prevented from deforming together with the body 6, and the discharge operability of the body 6 can be improved.

The heel portion 7 has a substantially 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 has a curved shape that gradually increases in diameter from the body portion 6 side toward the heel portion 7 side and is convex toward the outside of the container. With such a configuration, when the body part 6 is squeezed, the step part 14 or the heel part 7 can be prevented from deforming together with the body part 6, and the discharge operability of the body part 6 can be improved.

Note that the heel portion 7 may have a configuration in which a plurality (two) groove-shaped annular ribs 7a extending in the circumferential direction are provided on the outer circumferential surface of the heel portion 7. With this configuration, the rigidity of the heel portion 7 is increased, and when the body portion 6 is squeezed, deformation of the heel portion 7 together with the body portion 6 is more effectively suppressed, and the discharge operation of the body portion 6 is improved. can be further increased.

The bottom part 8 has an annular grounding part 8a centered on the axis O, and a central recessed part 8b located inside the grounding part 8a. The bottom portion 8 closes the lower end of the heel portion 7.

As shown in FIG. 2, in the laminated container 1, the wall thickness (average thickness) t1 of the inner layer body 3 in the body portion 6 is thicker than the wall thickness (average thickness) t2 of the inner layer body 3 in the heel portion 7. It has become.

Further, as shown in FIGS. 1 and 2, the stepped portion 14 provided between the body portion 6 and the heel portion 7 is provided with a recessed portion 20 that is recessed toward the inside of the container. In this embodiment, a plurality (six) of recesses 20 are provided in the stepped portion 14 in a row at equal intervals in the circumferential direction. Note that only three recesses 20 are shown in FIG.

As shown in FIG. 2, these recesses 20 include a bottom wall 20a that is flat in longitudinal section, and a curved peripheral wall 20b that surrounds the bottom wall 20a and connects the bottom wall 20a to the outer peripheral surface of the stepped portion 14. It is formed in the shape of a vertical rib extending from the body part 6 side toward the heel part 7 side. Note that the peripheral wall 20b may be an inclined wall extending from the outer peripheral surface of the stepped portion 14 toward the bottom wall 20a.

In the inner layer body 3, if the shoulder portion 5, body portion 6, and heel portion 7 have equal thickness, after squeezing the body portion 6 and discharging the contents, the squeeze of the body portion 6 is released and the inner layer body 3 is deformed to reduce its volume with respect to the outer layer body 2, the body portion 6, which is the squeeze portion, may collapse first, and the contents on the side of the heel portion 7 may not be able to be discharged. Therefore, as described above, in the laminated peelable container 1 of the present embodiment, the wall thickness (average wall thickness) t1 of the inner layer body 3 in the body portion 6 is changed from the wall thickness (average wall thickness) t1 of the inner layer body 3 in the heel portion 7 to ) is made thicker than t2. On the other hand, if the body part 6 side is made thicker in order to prevent the body part 6 side from collapsing earlier than the heel part 7 side, the influence of this thickening will also occur on the stepped part 14, causing the body part 6 to collapse. The inner layer 3 becomes difficult to peel off from the outer layer 2 at the stepped portion 14 which is the connecting portion between the heel portion 6 and the heel portion 7. Therefore, as described above, in the laminated and peelable container 1 of the present embodiment, the stepped portion 14 provided between the body portion 6 and the heel portion 7 is provided with a recessed portion 20 that is recessed toward the inside of the container. ing. In this way, in the laminated releasable container 1 of the present embodiment, in the configuration in which the lower end of the body 6 is connected to the heel portion 7 having a larger diameter than the body 6 via the stepped portion 14, the inner layer 3 in the body 6 is The wall thickness t1 of the inner layer body 3 in the heel portion 7 is made thicker than the wall thickness t2 of the inner layer body 3, and a recessed portion recessed toward the inside of the container is formed in the stepped portion 14 provided between the body portion 6 and the heel portion 7. 20, after squeezing the body 6 and discharging the contents, when the squeeze of the body 6 is released and the inner layer 3 is deformed to reduce its volume with respect to the outer layer 2, the stepped portion At step 14, the inner layer body 3 is peeled off starting from the recess 20, and the peeling progresses to the heel portion 7, which is thinner than the body portion 6, so that it can be easily crushed. At the same time, the heel portion 7 can also be easily peeled off. Therefore, in order to ensure the flexibility and restorability of the body 6, the laminated releasable container 1 may be configured to have a circumferential stepped portion 14 between the body 6 and the heel 7. The container 1 can be made to have improved releasability of the inner layer 3 from the outer layer 2 while maintaining the operability of discharging the contents.

In particular, when the outer layer body 2 and the inner layer body 3 of the laminated peelable container 1 are made of polyethylene terephthalate as in the present embodiment, the inner layer body 3 becomes difficult to peel off from the outer layer body 2 at the stepped portion 14. However, as in the present embodiment, the thickness t1 of the inner layer 3 in the trunk 6 is made thicker than the thickness t2 of the inner layer 3 in the heel 7, and the recess 20 is provided in the stepped portion 14. By doing so, even in such a laminated peelable container 1, the inner layer body 3 can be easily peeled off from the outer layer body 2 at the stepped portion 14.

Further, in the laminated peelable container 1 of the present embodiment, the recess 20 is formed in the shape of a vertical rib extending from the body 6 side to the heel portion 7 side, so that the vertical direction of the stepped portion 14 is The inner layer body 3 is easily peeled off from the outer layer body 2 over the entire area, and when the contents are discharged, the inner layer body 3 is more easily peeled off from the outer layer body 2 at the stepped portion 14 starting from the recessed portion 20. You can do it like this.

Furthermore, in the laminated releasable container 1 of this embodiment, the step portion 14 is provided with a plurality of recesses 20 arranged at equal intervals in the circumferential direction, so that the inner layer body 3 is formed at a plurality of locations in the circumferential direction of the step portion 14. The inner layer body 3 can be easily peeled off from the outer layer body 2, and the inner layer body 3 can be further easily peeled off from the outer layer body 2 at the stepped portion 14 when discharging the contents.

As shown in FIG. 2, in the laminated container 1, the wall thickness (average wall thickness) t1 of the inner layer body 3 at the body portion 6 is thicker than the wall thickness (average wall thickness) t3 of the inner layer body 3 at the shoulder portion 5. In addition, it is also possible to have a structure in which the sub-step part 13 provided between the shoulder part 5 and the body part 6 is provided with a sub-recessed part 21 that is recessed toward the inside of the container. In this embodiment, a plurality (six) of sub-recesses 21 are provided in the sub-step portion 13 in a row at equal intervals in the circumferential direction. Note that only three sub-recesses 21 are shown in FIG. Further, these sub-recesses 21 are arranged so as to match the circumferential position of the corresponding plurality (six) of recesses 20 provided in the stepped portion 14, respectively.

Furthermore, as shown in FIG. 2, these sub-recesses 21, like the recess 20, have a bottom wall 21a that is flat in longitudinal section, and a bottom wall 21a that surrounds the periphery of the bottom wall 21a and turns the bottom wall 21a into a sub-step part. It has a curved peripheral wall 21b connected to the outer circumferential surface of the shoulder section 13, and is formed in a vertical rib shape extending from the shoulder section 5 side toward the body section 6 side. Note that the peripheral wall 21b may be an inclined wall extending from the outer peripheral surface of the sub-step portion 13 toward the bottom wall 21a.

As described above, in the present embodiment, in a configuration in which the upper end of the body 6 is connected to the lower end of the shoulder 5 having a larger diameter than the body 6 via the sub-step portion 13, the thickness of the inner layer 3 in the body 6 is t1 is made thicker than the wall thickness t3 of the inner layer body 3 at the shoulder portion 5, and a sub-recessed portion 21 is formed in the sub-step portion 13 provided between the shoulder portion 5 and the body portion 6 and is recessed toward the inside of the container. By providing a structure in which the content is discharged by squeezing the body 6, when the squeeze of the body 6 is released and the inner layer body 3 is deformed to reduce its volume with respect to the outer layer body 2, the sub-level difference is formed. In addition to the fact that the inner layer body 3 is peeled off starting from the sub-recess 21 at the portion 13, the inner layer body 3 is easily peeled off from the shoulder portion 5 to the body portion 6 because the wall thickness of the shoulder portion 5 is thinner than the body portion 6. Can be done. Therefore, in order to ensure the flexibility and restorability of the body 6, the laminated removable container 1 may be configured to have a circumferential sub-level difference portion 13 between the shoulder 5 and the body 6. The peelable container 1 can be configured to have improved peelability of the inner layer 3 from the outer layer 2 while maintaining the operability of discharging the contents.

In particular, when the outer layer body 2 and the inner layer body 3 of the laminated peelable container 1 are made of polyethylene terephthalate as in the present embodiment, the inner layer body 3 becomes difficult to peel off from the outer layer body 2 at the sub-step portion 13. However, as in the present embodiment, the wall thickness t1 of the inner layer body 3 in the trunk portion 6 is made thicker than the wall thickness t3 of the inner layer body 3 in the shoulder portion 5, and the sub-recess portion 21 is provided in the sub-step portion 13. With this configuration, even in such a laminated peelable container 1, the inner layer body 3 can be easily peeled off from the outer layer body 2 at the sub-step portion 13.

Furthermore, in this embodiment, the sub-recessed portion 21 is formed in the shape of a vertical rib extending from the shoulder portion 5 side toward the trunk portion 6 side, so that the sub-recessed portion 21 is formed in the vertical rib shape extending from the side of the shoulder portion 5 toward the body portion 6 side. The inner layer body 3 is made easier to peel off from the outer layer body 2, so that when discharging the contents, the inner layer body 3 is more easily peeled off from the outer layer body 2 at the sub-step portion 13 starting from the sub-recessed portion 21. can do.

Furthermore, in this embodiment, since the plurality of recesses 20 are arranged in the sub-step portion 13 at equal intervals in the circumferential direction, the inner layer body 3 is separated from the outer layer body 2 at a plurality of locations in the circumferential direction of the step portion 14. By making it easier to peel off, the inner layer body 3 can be more easily peeled off from the outer layer body 2 at the stepped portion 14 when discharging the contents.

Furthermore, in this embodiment, the plurality of sub-recesses 21 provided in the sub-step portion 13 are arranged so as to match the circumferential positions of the plurality of corresponding recesses 20 provided in the step portion 14, respectively. , an outside air passage formed between the outer layer body 2 and the inner layer body 3 so as to continue from the outside air inlet 10 provided in the mouth portion 4 to the sub-recess portion 21 passes through the body portion 6 and enters the inner layer body 3 in the recess portion 20. is communicated between the outer layer body 2 and the inner layer body 3 on the side of the heel portion 7 through the part peeled off from the outer layer body 2, so that the inner layer body 3 can be more easily peeled off from the outer layer body 2 at the heel portion 7. It can be made easier.

In this case, as shown in FIG. 1, it is preferable to provide a sub-recess 21 directly below the outside air inlet 10. As a result, a straight passage of outside air can be provided from the outside air introduction port 10 provided in the mouth portion 4 toward the heel portion 7, and the inner layer body 3 can be more easily peeled off from the outer layer body 2 at the heel portion 7. Can be done.

In addition, as shown as a modification in FIG. 3, the laminated peelable container 1 can also have a configuration in which the sub-recessed part 21 is not provided in the sub-step part 13.

The laminated peelable container 1 having the above structure is a blow molded product.

In this embodiment, the laminated peelable container 1 has an outer body corresponding to the outer layer body 2 formed by injection molding a synthetic resin material (polyethylene terephthalate), and a synthetic resin material (polyethylene terephthalate) injected separately from the outer body. It is formed by biaxially stretch blow molding a double-structured preform assembly that combines a molded inner layer body 3 and a corresponding inner body.

In this case, the thickness of the portion of the inner body that is stretched and formed in the portion corresponding to the trunk portion 6 of the inner layer body 3 is the same as that of the portion that is stretched and formed in the portion that corresponds to the heel portion 7 of the inner layer body 3. By making the inner layer 3 thicker than the wall thickness of the body 6, it is possible to easily form a laminated container 1 in which the wall thickness t1 of the inner layer 3 in the body portion 6 is thicker than the wall thickness t2 of the inner layer 3 in the heel portion 7. can.

Note that the laminated removable container 1 is formed by biaxially stretch blow molding a laminated preform having a laminated structure of a synthetic resin material corresponding to the outer layer body 2 and a synthetic resin material corresponding to the inner layer body 3. You can also.

Moreover, the laminated peelable container 1 is produced by blow molding a cylindrical laminated parison in which a synthetic resin material corresponding to the outer layer body 2 and a synthetic resin material corresponding to the inner layer body 3 are laminated using a split mold. It can also be formed by extrusion blow molding (EBM).

In either case, the thickness of the stretched portion of the inner layer body 3 corresponding to the body 6 is the same as that of the stretched portion of the inner layer body 3 corresponding to the heel portion 7. To easily form a laminated container 1 in which the wall thickness t1 of the inner layer body 3 at the body portion 6 is thicker than the wall thickness t2 of the inner layer body 3 at the heel portion 7 by making the inner layer body 3 thicker than the wall thickness of the portion. Can be done.

The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.

For example, in the embodiment described above, the stepped portion 14 is provided with a plurality of recesses 20, but the present invention is not limited to this, and it is sufficient that the stepped portion 14 is provided with at least one recessed portion 20. Further, a plurality of recesses 20 may be arranged in the step portion 14 evenly or unevenly in the circumferential direction.

Further, in the above embodiment, the shape of the recess 20 is a vertical rib shape, but the shape is not limited to this, and can be made into various shapes as long as it is recessed toward the inside of the container. Note that the stepped portion 14 may be provided with a convex portion that protrudes toward the outside of the container instead of the concave portion 20. In this case, the height of the radially outward protrusion of the convex portion is equal to or less than the maximum diameter of the heel portion 7.

Furthermore, in the embodiment described above, the stepped portion 14 has a curved shape that gradually expands in diameter from the body portion 6 side toward the heel portion 7 side and is convex toward the outside of the container. For example, it may have a curved shape that is convex toward the inside of the container, or a tapered inclined surface (cone) that gradually expands in diameter linearly from the body 6 side to the heel portion 7 side. It can be made into various shapes, such as.

Further, in the embodiment described above, the mouth portion 4, the shoulder portion 5, the body portion 6, and the heel portion 7 each have a circular cross section perpendicular to the axis O, but the shape is not limited to this, and for example, , the cross section may also have other shapes such as a polygon or an ellipse.

Further, in the above embodiment, the outside air introduction port 10 is provided in the portion constituting the mouth portion 4 of the outer layer body 2 as a through hole passing through the portion in the radial direction. As long as the structure allows outside air to be introduced between the body 2 and the inner layer 3, it may be provided in any part of the shoulder 5, torso 6, heel 7, and bottom 8. The form thereof is not limited to a through hole, but may be a slit or a gap opening at the boundary between the outer layer 2 and the inner layer 3.

Furthermore, in the embodiment, the sub-recess 21 is arranged so as to match the circumferential position with the recess 20; however, the arrangement is not limited to this, and the sub-recess 21 is arranged with a circumferential position shifted relative to the recess 20. You may also do so.

1 Laminated peelable container 2 Outer layer body 3 Inner layer body 4 Mouth part 4a Male screw 5 Shoulder part 6 Body part 6a Vertical groove 7 Heel part 7a Annular rib 8 Bottom part 8a Ground part 8b Center recessed part 9 Neck ring 10 Outside air introduction port 11 Recessed rib 12 Recessed part Rib 13 Sub-step portion 14 Step portion 20 Recess 20a Bottom wall 20b Peripheral wall 21 Sub-recess 21a Bottom wall 21b Peripheral wall O Axis S Storage space t1 Wall thickness t2 Wall thickness t3 Wall thickness

Claims (8)

A laminated peelable container comprising an outer layer body, an inner layer layered on an inner surface of the outer layer body so as to be peelable and deformable to reduce volume, and an outside air inlet connected between the outer layer body and the inner layer body. ,
A cylindrical mouth part, a shoulder part connected to the mouth part, a cylindrical body part connected to the shoulder part, a cylindrical part having a larger diameter than the body part, and a circumferential stepped part. A bottle-shaped bottle having a heel part connected to the body and a bottom part connected to the heel part,
The thickness of the inner layer body in the trunk portion is thicker than the thickness of the inner layer body in the heel portion, and
A laminated and peelable container, characterized in that the stepped portion is provided with a recessed portion that is recessed toward the inside of the container. The laminated peelable container according to claim 1, wherein the plurality of recesses are arranged in the circumferential direction in the stepped portion. The laminated peelable container according to claim 1 or 2, wherein the recessed portion is formed in the shape of a vertical rib extending from the body side toward the heel portion side. The body portion is connected to the shoulder portion via a circumferential sub-step portion,
The thickness of the inner layer body in the trunk portion is thicker than the thickness of the inner layer body in the shoulder portion, and
The laminated and peelable container according to claim 1, wherein the sub-step portion is provided with a sub-recessed portion recessed toward the inside of the container. 5. The laminated releasable container according to claim 4, wherein the sub-recess is arranged to match the circumferential position of the recess. The laminated peelable container according to claim 4 or 5, wherein the sub-recess is formed in the shape of a vertical rib extending from the shoulder side toward the body side. 2. The laminated peelable container according to claim 1, wherein a plurality of vertical grooves extending from the shoulder side toward the heel side are arranged in the circumferential direction in the body. The laminated peelable container according to claim 1, wherein the outer layer body and the inner layer body are made of polyethylene terephthalate.

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