Delamination container

Abstract

To provide a delaminatable container with improved squeeze operability of a barrel part.SOLUTION: A delamination container 1 includes an outer layer body 2, an inner layer body which is laminated on an inner surface of the outer layer body 2 in a peelable manner and is deformable by volume reduction, and an outside air introduction port 13 connected between the outer layer body 2 and the inner layer body. A bottle shape having a tubular mouth portion 10 centered on an axis O, a shoulder portion 20 continuous with the mouth portion 10, a body portion 30 continuous with the shoulder portion 20, and a bottom portion 40 continuous with the body portion 30, wherein the body portion 30 includes four panel walls 31 which are disposed to be shifted by 90 degrees in a circumferential direction with respect to each other around the axis O, and both side edge portions 31a facing the circumferential direction are curved outward in the circumferential direction to form a convex curved shape and intermediate portions 31b in a vertical direction are curved to approach the axis O; And four connecting walls 32 each having a width smaller than that of the panel wall 31.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a peelable laminated container comprising an outer layer, a shrinkable and deformable inner layer peelably laminated on the inner surface of the outer layer, and an outside air inlet connected between the outer layer and the inner layer. [Background technology]

[0002] BACKGROUND ART A peelable laminate container is known as a container for storing contents such as food seasonings such as soy sauce or beverages, cosmetics such as lotion, and toiletries such as shampoo, conditioner, or liquid soap. The peelable laminate container comprises an outer layer, an inner layer that is peelably laminated on the inner surface of the outer layer and is capable of being reduced in size and deformed, and an outside air inlet port that is connected between the outer layer and the inner layer.

[0003] In the peelable laminated container of the above configuration, after the contents are discharged to the outside, outside air is introduced between the outer layer and the inner layer through the outside air inlet, allowing the inner layer to be reduced in volume and deformed to match the amount of contents discharged while maintaining the outer layer in its original shape.This means that the contents stored in the inner layer are discharged without being replaced by outside air, preventing the contents stored in the inner layer from coming into contact with outside air and preventing their deterioration or alteration.

[0004] Conventionally, such peelable laminated containers have been known to be of the squeeze type, which are bottle-shaped and have a cylindrical mouth, a shoulder connected to the mouth, a body connected to the shoulder, and a bottom connected to the body, and when the body is squeezed (pressed), the contents stored inside the container are pushed out through the mouth and ejected (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-035227 Summary of the Invention [Problem to be solved by the invention]

[0006] The squeeze-type delaminating container as described above preferably has a body that is easily squeezable.

[0007] However, when the body is cylindrical (with a circular cross section), a consistent feel can be obtained no matter which direction the body is squeezed from, whereas when the body is rectangular (with a roughly rectangular cross section), the feel is different when squeezing the body from a side of the rectangle versus a corner of the rectangle, and in this respect there is room for improvement in the ease of squeezing the body.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide a delaminating container having an improved squeeze operability of the body. [Means for solving the problem]

[0009] The peelable laminated container of the present invention is a peelable laminated container comprising an outer layer, an inner layer that is peelably laminated on the inner surface of the outer layer and is freely deformable when reduced in volume, and an outside air inlet port connected between the outer layer and the inner layer, and is bottle-shaped with a cylindrical mouth centered on the axis, a shoulder connected to the mouth, a body connected to the shoulder, and a bottom connected to the body, and is characterized in that the body is arranged circumferentially at 90 degrees offset from each other around the axis, and has four panel walls whose both side edges facing the circumferential direction are each convexly curved outward in the circumferential direction and whose upper and lower middle portions are curved so as to approach the axis, and four connecting walls that are integrally connected between adjacent panel walls and are narrower than the panel walls.

[0010] In the delamination container of the present invention having the above-mentioned configuration, it is preferable that curved concave ribs are provided on the side edges of each of the panel walls.

[0011] In the above-described configuration, the delaminating container of the present invention preferably includes four vertical recessed ribs extending from the shoulder portions to the corresponding panel walls. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a delaminating container having an improved squeeze operability of the body portion. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of a delaminating container according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 2 is a plan view of the delaminating container shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] A delaminating container 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0015] In this specification and claims, the up-down direction means the up-down direction when the delaminating container 1 is in an upright position as shown in Figure 1 (the direction in which the axis O of the delaminating container 1 extends), the circumferential direction means the direction circling around the axis O of the delaminating container 1, and the radial direction means the direction passing through the axis O of the delaminating container 1 and perpendicular to the axis O.

[0016] The delaminating container 1 shown in Fig. 1 is a squeeze type that can be used to store a variety of contents, for example, food seasonings such as soy sauce, foods such as beverages, cosmetics such as lotion, toiletries such as shampoo, conditioner, or liquid soap, etc. As shown in Fig. 2, the delaminating container 1 has a double structure having an outer layer 2 and an inner layer 3.

[0017] As shown in FIG. 1, the outer layer 2 constitutes the outer shell of the delaminated container 1 .

[0018] In this embodiment, the outer layer 2 is made of polyethylene terephthalate resin (PET). The outer layer 2 is not limited to a single-layer structure, and may have a multi-layer structure to improve barrier properties, etc., as long as it is made primarily of polyethylene terephthalate resin.

[0019] As shown in Figure 2, the inner layer body 3 is formed in a bag shape that is thinner than the outer layer body 2 and is peelably laminated over almost the entire inner surface of the outer layer body 2. Peeling of the inner layer body 3 from the inner surface of the outer layer body 2 may be performed by peeling from an adhered state, peeling from a pseudo-adhered state, or separation from a tightly adhered state. The inner layer body 3 can store contents therein. The inner layer body 3 is freely deformable to reduce its volume while peeling from the inner surface of the outer layer body 2 as the contents are poured out.

[0020] In this embodiment, the inner layer 3 is also made of polyethylene terephthalate resin. Note that the inner layer 3 is not limited to a single-layer structure, and can have a multi-layer structure to improve barrier properties, etc., as long as it is made primarily of polyethylene terephthalate resin.

[0021] In this embodiment, the delaminating container 1 is a blow-molded container made of polyethylene terephthalate resin, with both the outer layer 2 and the inner layer 3 being made of biaxially stretchable polyethylene terephthalate resin. Examples of polyethylene terephthalate resin include homo-PET, but other PETs such as IPA (isophthalic acid)-modified PET or CHDM-modified PET can also be used. The polyethylene terephthalate resin constituting the outer layer 2 and the polyethylene terephthalate resin constituting the inner layer 3 can be of the same or different composition.

[0022] By using polyethylene terephthalate resin for the outer layer 2 and the inner layer 3, the delaminated container 1 can be made lightweight, strong, and highly transparent.

[0023] In addition, the outer layer body 2 and the inner layer body 3 are not limited to being made of polyethylene terephthalate resin, but may be made of other synthetic resins such as polypropylene (PP) or polyethylene (PE), or the outer layer body 2 and the inner layer body 3 may be made of different synthetic resins.

[0024] As shown in Figures 1 and 3, the delaminated container 1 has a bottle shape having a mouth 10, a shoulder 20 connected to the lower end of the mouth 10, a body 30 connected to the lower end of the shoulder 20, and a bottom 40 connected to the lower end of the body 30.

[0025] The mouth portion 10 is generally cylindrical and has an axis O as its center, and is integrally provided on its outer circumferential surface with a male thread 11 for attaching a member such as a pouring cap. In addition, a neck ring 12 is integrally provided below the male thread 11 of the mouth portion 10.

[0026] The mouth portion 10 may be configured to have a protrusion that allows a member such as a pouring cap to be undercut-engaged by tapping, instead of the male thread 11. Also, the neck ring 12 may not be provided.

[0027] An outside air inlet 13 is provided in the mouth portion 10. In this embodiment, the outside air inlet 13 is provided as a through-hole that penetrates the outer layer body 2 in the radial direction in the portion that constitutes the mouth portion 10 of the outer layer body 2. The outside air inlet 13 is connected between the outer layer body 2 and the inner layer body 3, and can introduce outside air between the outer layer body 2 and the inner layer body 3 as the inner layer body 3 peels off from the outer layer body 2.

[0028] The shoulder portion 20 has a shape that gradually widens in diameter from the upper end connected to the mouth portion 10 toward the lower end connected to the body portion 30. In this embodiment, the shoulder portion 20 has a shape that gradually changes so that the cross-sectional shape perpendicular to the axis O at the upper end connected to the mouth portion 10 is approximately circular and the cross-sectional shape perpendicular to the axis O at the lower end connected to the body portion 30 becomes approximately rectangular. As shown in FIG. 3 , the approximately rectangular shape at the lower end of the shoulder portion 20 is an approximately square having four sides 21 of equal length and chamfered corners 22 that are positioned between these four sides 21 and are shorter than the sides 21.

[0029] The shape of the shoulder portion 20 can be modified in various ways as long as it has a shape that gradually widens in diameter from the upper end connected to the mouth portion 10 toward the lower end connected to the body portion 30.

[0030] As shown in FIGS. 1 and 3, the body portion 30 has a generally rectangular cylindrical shape extending along an axis O as a whole.

[0031] More specifically, the body 30 has four panel walls 31 arranged at 90-degree circumferential offsets from each other around the axis O, and four connecting walls 32 provided integrally between adjacent panel walls 31. The upper ends of the four panel walls 31 are integrally connected to the sides 21 of the shoulder 20, and the upper ends of the four connecting walls 32 are integrally connected to the corners 22 of the shoulder 20.

[0032] The four panel walls 31 have the same shape as one another, and the four connecting walls 32 have the same shape as one another.

[0033] As shown in Fig. 1, both circumferentially facing side edge portions 31a of the panel wall 31 are curved in a convex shape facing outward in the circumferential direction. That is, the width of each panel wall 31 at its upper and lower ends is narrower than the width of its middle portion 31b in the vertical direction. In this embodiment, the middle portion 31b of each panel wall 31 is located in the middle between the upper and lower ends of the panel wall 31.

[0034] Each panel wall 31 has a shape that curves radially inward so that the middle portion 31b is closer to the axis O than the upper and lower ends. That is, a vertical cross section of each panel wall 31 cut along a plane passing through the axis O has an arc shape that curves radially inward so that the middle portion 31b is located closer to the axis O than the upper and lower ends.

[0035] In this embodiment, curved concave ribs 33 are provided on both side edge portions 31a of each panel wall 31. The curved concave ribs 33 are arc-shaped and convex outward in the circumferential direction extending along the side edge portions 31a, and their outer circumferential edges form the side edge portions 31a of the panel wall 31. Each curved concave rib 33 is groove-shaped and recessed radially inward on the surface of the body 30, and is rib-shaped and protrudes radially inward on the inner surface of the body 30.

[0036] The panel wall 31 may not necessarily have the curved concave rib 33 .

[0037] Each panel wall 31 may also be configured to have a plurality of thin vertical ribs 34 inside the pair of curved concave ribs 33. In FIG. 1 , for convenience, only some of the thin vertical ribs 34 are labeled with reference numerals. In this embodiment, an equal number of thin vertical ribs 34 are provided circumferentially side by side on the upper and lower sides of the intermediate portion 31b inside the pair of curved concave ribs 33. Of the plurality of thin vertical ribs 34, the two thin vertical ribs 34 from the outer side in the circumferential direction are made shorter in length relative to the other thin vertical ribs 34 as they move outward so as to fit inside the curved concave ribs 33.

[0038] The panel wall 31 may not necessarily have the plurality of thin vertical ribs 34.

[0039] As described above, the four connecting walls 32 are provided integrally between adjacent panel walls 31. That is, the portions of the body 30 between adjacent panel walls 31 form the connecting walls 32. Therefore, both circumferentially facing side edges of the connecting walls 32 are curved inwardly in the circumferential direction. That is, the width of the vertical middle portion of each connecting wall 32 is narrower than the widths of the upper and lower ends.

[0040] Furthermore, the width of each connecting wall 32 is narrower than the width of the panel wall 31. That is, the width of the upper end of the connecting wall 32 is narrower than the width of the upper end of the panel wall 31, the width of the lower end of the connecting wall 32 is narrower than the width of the lower end of the panel wall 31, and the width of the middle part of the connecting wall 32 in the vertical direction is narrower than the width of the middle part 31b of the panel wall 31.

[0041] It is preferable that the width of the middle portion 31b of the panel wall 31 is four times or more the width of the middle portion of the connecting wall 32 in the vertical direction.

[0042] The body 30 configured as described above is flexible, and can be elastically deformed radially inward (toward the interior of the container) when squeezed (pressed) radially inward. That is, the delaminating container 1 can eject the contents contained therein by squeezing (pressing) the body 30 toward the interior of the container. The body 30 also has restoring properties, and can return to its original shape from a deformed state when the squeeze is released.

[0043] The bottom 40 is in the shape of a rectangular cylinder with a bottom, is integrally connected to the lower end of the body 30, and closes the lower end of the body 30.

[0044] The delaminating container 1 can also be configured with four vertical recessed ribs 50 each extending from the shoulder portion 20 to the corresponding panel wall 31. In this embodiment, the delaminating container 1 is configured with four vertical recessed ribs 50 each extending continuously in a straight line from the upper end of the shoulder portion 20, passing through the circumferential center of the corresponding side 21, passing through the circumferential center of the corresponding panel wall 31, and down to the lower end of the panel wall 31. Each vertical recessed rib 50 is groove-shaped and recessed radially inward on the surface of the body 30, and is rib-shaped and protrudes radially inward on the inner surface of the body 30. In each panel wall 31, the same number of thin vertical ribs 34 are arranged on both sides of the vertical recessed rib 50.

[0045] The four vertical recessed ribs 50 are not limited to a configuration in which they extend continuously in a straight line from the upper end of the shoulder portion 20 to the lower end of the corresponding panel wall 31, but may instead be configured to extend intermittently in a straight line from the upper end of the shoulder portion 20 to the lower end of the corresponding panel wall 31. In this case, it is preferable that the vertical recessed rib 50 has a shape that straddles the boundary between the shoulder portion 20 and the body portion 30. Furthermore, the length of the vertical recessed rib 50 is not limited as long as it extends from the shoulder portion 20 to the corresponding panel wall 31. Furthermore, the delaminating container 1 may not be configured to have four vertical recessed ribs 50.

[0046] The delaminating container 1 can also be configured with a plurality of sub-ribs 60 each extending from the shoulder portion 20 to the body portion 30. In this embodiment, two sub-ribs 60 are provided circumferentially at equal intervals on both sides of each vertical concave rib 50, each extending continuously from the upper end of the shoulder portion 20 to a position above the upper ends of the curved concave rib 33 and the narrow vertical rib 34 of the body portion 30. Each sub-rib 60 is groove-shaped recessed radially inward on the surfaces of the shoulder portion 20 and the body portion 30, and is rib-shaped protruding radially inward on the inner surfaces of the shoulder portion 20 and the body portion 30.

[0047] The delaminating container 1 may not necessarily have the plurality of sub-ribs 60.

[0048] The delaminating container 1 having the above-mentioned structure is a blow-molded product.

[0049] In this embodiment, the delaminating container 1 is a blow-molded product formed by biaxially stretching and blow-molding a double-structure preform assembly that combines an outer preform formed by injection molding polyethylene terephthalate resin with an inner preform formed by injection molding polyethylene terephthalate resin separately from the outer preform. The outer preform corresponds to the outer layer 2, and the inner preform corresponds to the inner layer 3.

[0050] In addition, the delaminated container 1 can also be formed by biaxially stretching blow molding a laminated preform composed of a synthetic resin material corresponding to the outer layer 2 and a synthetic resin material corresponding to the inner layer 3 laminated together.

[0051] The delaminated container 1 can also be formed by extrusion blow molding (EBM), in which a cylindrical laminated parison made of a laminate of a synthetic resin material corresponding to the outer layer 2 and a synthetic resin material corresponding to the inner layer 3 is blow-molded using a split mold.

[0052] The delaminated container 1 of this embodiment having the above-mentioned configuration has a body 30 comprising four panel walls 31 arranged 90 degrees circumferentially around the axis O, with both circumferentially facing side edge portions 31a each having a convex curved shape directed outward in the circumferential direction and with the vertical middle portions 31b curved so as to approach the axis O, and four connecting walls 32 each connected integrally between adjacent panel walls 31 and narrower than the panel walls 31. Therefore, by increasing the proportion of the panel walls 31 in the vertical middle portion of the approximately rectangular cylindrical body 30, the shape of the rectangular cylindrical body can be made more angular. This allows the user, when squeezing the torso 30, to guide the squeezing direction in a direction perpendicular to the panel wall 31, i.e., in a direction (side direction) that presses the side of the panel wall 31 of the torso 30 in a cross-sectional view. Therefore, when the user squeezes the torso 30, the panel wall 31 is always squeezed, making the feel of use when squeezing consistent and improving the squeezability of the torso 30.

[0053] Furthermore, in the delaminating container 1 according to this embodiment having the above configuration, the squeeze direction is guided as described above, so that only the panel walls 31 are squeezed and deformed radially inward during squeezing. Therefore, the inner layer 3 is preferentially peeled from the outer layer 2 at the panel walls 31, while the inner layer 3 is less likely to peel from the outer layer 2 at the connecting walls 32, which are not squeezed, compared to the panel walls 31. That is, as the body 30 is squeezed and the contents are dispensed, the four corners of the inner layer 3 corresponding to the four connecting walls 32 do not peel away much from the connecting walls 32, and the panel walls 31 collapse around the four corners. This leaves a space in the center of the collapsed inner layer 3 toward the end of use when the remaining contents are reduced. When the delaminating container 1 is tilted, air in the headspace moves quickly through this space toward the bottom 40, making it easy to dispense the contents to the end (reducing the remaining amount).

[0054] Furthermore, in the delaminating container 1 according to this embodiment having the above configuration, the side edge 31a of each panel wall 31 is provided with a curved concave rib 33, so that the squeezed panel wall 31 deforms radially inward inside the curved concave rib 33, making it difficult for the deformation caused by the squeeze to be transmitted to the connecting wall 32. This makes it more difficult for the inner layer body 3 to peel from the outer layer body 2 at the connecting wall 32 when the panel wall 31 is squeezed, making it easier to dispense the contents to the last drop.

[0055] Furthermore, the delaminating container 1 according to this embodiment having the above-described configuration is provided with four vertical recessed ribs 50 each extending from the shoulder portion 20 to the corresponding panel wall 31. This facilitates the formation of an outside air passage between the outer layer body 2 and the inner layer body 3 at the portion where the vertical recessed ribs 50 are provided, from the outside air inlet 13 provided in the mouth portion 10 toward the panel wall 31, making it easier to peel the inner layer body 3 from the outer layer body 2 at the panel wall 31. In particular, in the delaminating container 1 according to this embodiment, each vertical recessed rib 50 is arranged to pass through the circumferential center of the corresponding panel wall 31. This allows the panel wall 31 to easily deform radially inward when squeezed, bending at the vertical recessed ribs 50, making it easier to squeeze the panel wall 31.

[0056] Furthermore, in the peelable laminated container 1 of this embodiment having the above-mentioned configuration, multiple secondary ribs 60 are provided extending from the upper end of the shoulder portion 20 to the body portion 30. These secondary ribs 60 also make it easy to form a passage for outside air between the outer layer 2 and the inner layer 3 from the outside air inlet 13 provided in the mouth portion 10 toward the body portion 30, making it easier to peel the inner layer 3 from the outer layer 2 at the body portion 30.

[0057] Furthermore, in the delaminated container 1 of this embodiment having the above-mentioned configuration, the panel wall 31 has a curved shape such that the middle portion 31b in the vertical direction approaches the axis O, so that when squeezed, it can easily deform radially inward, bending with the middle portion 31b as the base point.

[0058] Furthermore, in the peelable laminated container 1 of this embodiment having the above-mentioned configuration, multiple thin vertical ribs 34 are provided on the panel wall 31, making it easier to peel the inner layer 3 from the outer layer 2 in the panel wall 31, and increasing the rigidity of the panel wall 31, thereby improving the ability of the panel wall 31 to return to its original shape after squeezing.

[0059] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0060] 1. Delaminated container 2 Outer body 3 Inner layer 10 Mouth 11 Male thread 12 Neck Ring 13 Fresh air intake 20 Shoulder 21 sides 22 Corner 30 Torso 31 Panel Wall 31a Side edge 31b middle part 32 Connecting wall 33 Curved concave rib 34 Thin vertical ribs 40 bottom 50 Vertical concave rib 60 Secondary Rib O axis

Claims

1. A delaminating container comprising an outer layer, a shrinkable and deformable inner layer that is peelably laminated on the inner surface of the outer layer, and an outside air inlet that is connected between the outer layer and the inner layer, The bottle has a cylindrical mouth portion centered on an axis, a shoulder portion connected to the mouth portion, a body portion connected to the shoulder portion, and a bottom portion connected to the body portion, The body portion is four panel walls arranged at 90 degrees offset from one another in the circumferential direction around the axis, with both side edges facing the circumferential direction each having a curved shape that is convex outward in the circumferential direction and with intermediate portions in the up-down direction curved so as to approach the axis; and four connecting walls each of which is integrally connected between adjacent panel walls and has a width narrower than that of the panel walls.

2. 2. The delaminating container according to claim 1, wherein each of said panel walls has a side edge provided with a curved concave rib.

3. 3. The delaminating container according to claim 1, further comprising four vertical concave ribs each extending from the shoulder to the corresponding panel wall.

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