Laminated peel-off container and container with contents using the same

Abstract

To provide a delamination container which has enhanced shock resistance of an internal layer body, while enhancing detachability of the internal layer body from an external layer body, and to provide a container with content.SOLUTION: A delamination container 1 which has an external layer body 2 and an internal layer body 3 and in which an outside air introduction port 14 is provided at a mouth part 10 includes: a cap seal part 15 provided continuous to a lower end of the mouth part 10; a pedestal part 16 provided continuous to a lower end of the cap seal part 15; a straight part 17 provided continuous to a lower end of the pedestal part 16 and an upper end of a shoulder part 11; and a concave rib 18 provided extending vertically from the straight part 17 to the shoulder part 11. In the delamination container 1, the wall thickness of the internal layer body 3 inside the straight part 17 is 0.1-0.3 mm, vertical direction length L of the pedestal part 16 is 1.0-5.0 mm, an angle α of the pedestal part 16 is 100-155°, a vertical direction distance D from the lower end of the pedestal part 16 to an upper end 18a of the concave rib 18 is 4.0-12.0 mm.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a laminated peelable container made of synthetic resin having an outer layer and an inner layer, and a container containing contents using the same.

Background Art

[0002] Conventionally, a bottle-shaped outer layer having a mouth, a shoulder, a body, and a bottom, an inner layer that can be reduced in volume and deformed and is laminated on the inner surface of the outer layer so as to be peelable, and an outer air introduction hole provided at the mouth and connected between the outer layer and the inner layer are known. A laminated peelable container made of synthetic resin. The laminated peelable container is used as a container containing contents, for example, by storing contents in the storage space of the inner layer and attaching a cap to the mouth.

[0003] In the above container containing contents, when discharging the contents to the outside, outside air is introduced between the outer layer and the inner layer through the outside air introduction hole, so that only the inner layer is reduced in volume and deformed while the outer layer is maintained in its original shape. Therefore, it is possible to suppress the introduction of outside air into the inside of the inner layer after discharging the contents, and reduce the deterioration and alteration of the contents stored in the container.

[0004] The laminated peelable container is, for the purpose of smoothly peeling the inner layer from the outer layer when discharging the contents, previously blowing air from the outside air introduction hole formed at the mouth of the outer layer or sucking the air inside the inner layer from the mouth. In some cases, an initial peeling process is performed to peel the inner layer from the outer layer, and then air is pressed into the inside of the inner layer from the mouth to return the inner layer to its original state. However, even when the initial peeling process is performed, the entire inner layer may adhere to the outer layer again, and the inner layer may not peel smoothly from the outer layer during use.

[0005] To address these problems, a known type of laminated peeling container is available, for example, the one shown in Patent Document 1, which has concave ribs extending vertically on the shoulders of the outer layer. This prevents the inner layer from adhering to the outer layer in the area surrounding the concave ribs after the initial peeling treatment, allowing the inner layer to be smoothly peeled away from the outer layer during use. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-055558 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In order to improve the appearance of the laminated peeling container, it is conceivable to have an outer layer with the following shape: a cap seal portion that is attached to the lower end of the mouth and abuts the inner surface of the cap that is fitted to the mouth with its outer surface; a base portion that is attached to the lower end of the cap seal portion and is inclined at a predetermined angle such that the outer surface is located radially outward as it goes downward; and a straight portion that is attached to the lower end of the base portion and to the upper end of the shoulder portion, with the outer surface parallel to the axis of the mouth, and the upper end of the concave rib positioned on the straight portion.

[0008] However, with this configuration, there was a problem in that if the container containing the contents were to fall in an inverted position and an impact was applied to the opening, there was a risk that cracks or other damage would occur to the inner layer at the part corresponding to the upper end of the concave rib.

[0009] One possible solution to this problem is to increase the thickness of the inner layer in the portion corresponding to the upper end of the concave rib to suppress such damage. However, in this case, the inner layer becomes harder, making it difficult to separate from the outer layer during the initial delamination process. Furthermore, it becomes difficult for creases to form in the inner layer after delamination, making it difficult to secure an airway when the inner layer is reattached to the outer layer.

[0010] The present invention aims to solve these problems, and its objective is to provide a laminated peelable container that enhances the peelability of the inner layer from the outer layer while also enhancing the impact resistance of the inner layer, and a container filled with contents using the same. [Means for solving the problem]

[0011] The laminated peel-off container of the present invention comprises a bottle-shaped outer layer having a mouth, shoulder, body and bottom, and a volume-reducing and deformable inner layer having a storage space for contents and being peelably laminated on the inner surface of the outer layer, wherein an outside air intake hole connected between the outer layer and the inner layer is provided at the mouth, and the laminated peel-off container of the present invention comprises a cap seal portion provided in connection with the lower end of the mouth and in contact with the inner circumferential surface of a cap fitted to the mouth with its outer circumferential surface, a base portion provided in connection with the lower end of the cap seal portion and inclined at a predetermined angle such that the outer circumferential surface is located radially outward towards the lower side, a cylindrical straight portion provided in connection with the lower end of the base portion and in connection with the upper end of the shoulder, and the outer circumferential surface is substantially parallel to the axis of the mouth, and a concave rib provided extending vertically from the straight portion to the shoulder, with the upper end positioned at the straight portion, and the straight portion inside The inner layer has a thickness of 0.1 to 0.3 mm on the side, the base portion has a vertical length of 1.0 to 5.0 mm, the angle is 100 to 155°, and the vertical distance from the lower end of the base portion to the upper end of the concave rib is 4.0 to 12.0 mm.

[0012] In the laminated peeling container of the present invention, it is preferable that a pair of outside air inlet holes are provided symmetrically across the axis of the opening in the opening, and that at least one concave rib is provided on each of the left and right sides below each of the outside air inlet holes, with the circumferential position of the outside air inlet hole in between.

[0013] The contents-containing container of the present invention comprises a laminated peel-off container having the above configuration, a cap fitted to the mouth of the laminated peel-off container, and contents stored in the storage space, and is characterized in that the contents have a volume of 330 to 700 g.

[0014] In the above configuration, the container containing the contents of the present invention preferably has a weight of 400g or more. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a laminated peelable container that enhances the peelability of the inner layer from the outer layer while also enhancing the impact resistance of the inner layer, and a container filled with contents using the same. [Brief explanation of the drawing]

[0016] [Figure 1] This is a front view showing a portion of a laminated peeling container, which is one embodiment of the present invention. [Figure 2] Figure 1 is a side view of the laminated peeling container. [Figure 3] Figure 1 is a plan view of the laminated peeling container. [Figure 4] Figure 1 is a magnified view of the main part of the laminated peeling container shown. [Modes for carrying out the invention]

[0017] The present invention will be described more specifically below with reference to the drawings.

[0018] In this specification, claims, and abstract, "vertical direction" means the vertical direction when the laminated peeling container 1 is in an upright position, as shown in Figure 1.

[0019] The laminated peel-off container 1 made of synthetic resin, which is one embodiment of the present invention shown in Figures 1 to 3, can be used to store contents such as food seasonings (e.g., soy sauce), cosmetics such as lotions, and toiletries such as shampoos, conditioners, or liquid soaps.

[0020] The laminated peeling container 1 is configured in a double structure having an outer layer body 2 made of a synthetic resin and an inner layer body 3 made of a synthetic resin housed inside the outer layer body 2.

[0021] The outer layer body 2 is a part that constitutes the outer shell of the laminated peeling container 1, and has a bottle shape including a cylindrical (in this example, circular cylindrical) mouth portion 10, an annular shoulder portion 11 located below the mouth portion 10 and gradually expanding in diameter downward, a substantially cylindrical body portion 12 integrally connected to the lower end of the shoulder portion 11, and a bottom portion 13 closing the lower end portion of the body portion 12.

[0022] In the illustrated case, the body portion 12 is configured with a plurality of circumferential grooves 12a provided.

[0023] The outer layer body 2 can be formed of, for example, a synthetic resin material mainly composed of low-density polyethylene (LDPE). In this case, the synthetic resin material mainly composed of low-density polyethylene may be a synthetic resin material composed only of low-density polyethylene, or may be a synthetic resin material in which other types of synthetic resin materials or additives are mixed with low-density polyethylene. Further, the outer layer body 2 is not limited to a single-layer structure by the above synthetic resin material, and may also have a multilayer structure. Furthermore, the outer layer body 2 may be formed mainly of other synthetic resin materials such as, for example, polypropylene (PP).

[0024] The inner layer body 3 is formed in a bag shape thinner than the outer layer body 2, is laminated on the inner surface of the outer layer body 2 so as to be peelable, and has a shape corresponding to the shape of the outer layer body 2.

[0025] The inner layer body 3 can be formed of, for example, a synthetic resin material such as EVOH (ethylene-vinyl alcohol copolymer) or nylon (registered trademark). Further, the inner layer body 3 is not limited to a single-layer structure by the above synthetic resin material, and may also have a multilayer structure such as, for example, a structure in which an EVOH layer and a polyethylene layer are laminated.

[0026] Although not shown in detail, the opening of the inner layer 3, which is formed in a bag shape, is connected to the opening end of the mouth 10 of the outer layer 2, and the inside of the inner layer 3 is a storage space S connected to the opening. The contents described above can be contained inside the inner layer 3, i.e., the storage space S. The inner layer 3 is deformable to reduce its volume, and as the contents are discharged, it can be deformed to detach from the inner surface of the outer layer 2 and reduce the volume of the storage space S.

[0027] A long, narrow adhesive strip (not shown) extending from the opening 10 to the bottom 13 can be provided between the outer layer 2 and the inner layer 3, and the outer layer 2 and the inner layer 3 can be bonded together at the portion of the adhesive strip. The adhesive strip may be one or two or more, as long as it is positioned in a location that does not hinder the volume reduction deformation of the inner layer 3. Furthermore, if the laminated peel-off container 1 is formed by extrusion blow molding as described later, two adhesive strips can be provided on either side of the parting line created by the molding process.

[0028] The outer layer 2 has a pair of outside air intake holes 14 at its opening 10. These outside air intake holes 14 are circular in shape, as shown in Figure 1, and are arranged symmetrically across the axis O of the opening 10, as shown in Figure 3. Each of these outside air intake holes 14 penetrates the outer layer 2 and communicates with the inner layer 3. This allows outside air to be introduced through the outside air intake holes 14 into the gap between the outer layer 2 and the inner layer 3 when the inner layer 3 separates from the outer layer 2. The portion of the opening 10 where the outside air intake holes 14 are provided is beveled flat.

[0029] The laminated release container 1 can be formed by co-extruding a synthetic resin material for the outer layer 2, which has low compatibility, and a synthetic resin material for the inner layer 3 to form a laminated parison, and then using a mold to perform extrusion blow molding (EBM) on this laminated parison. The bottom 13 of the laminated release container 1 has a pinch-off portion 13a, which is formed when the laminated parison is cut off by the mold during extrusion blow molding.

[0030] A male screw 10a is integrally provided on the outer circumferential surface of the opening 10. A cap 20 can be attached to the opening 10 by screw-connecting it to the male screw 10a. As the cap 20, for example, one can be used that has a discharge port for discharging the contents and an opening that connects the outside air intake hole 14 to the outside. In this case, a check valve can be provided in either the discharge port or the opening, or in both.

[0031] Furthermore, the cap 20 can be attached to the opening 10 by undercut engagement with a plug instead of screw connection. In this case, a locking projection for plugging is provided on the outer surface of the opening 10 instead of a male screw 10a.

[0032] The laminated peel-off container 1 is converted into a container 30 containing contents by storing the contents in the storage space S and attaching a cap 20 to the opening 10.

[0033] In a container 30 containing contents with this configuration, the contents can be pushed out through the opening 10 by opening the cap 20 and squeezing the body 12 of the outer layer 2. More specifically, by pressing the body 12 of the outer layer 2, the pushed-out contents can be discharged to the outside through the discharge port of the discharge cap. Furthermore, when the pressure on the body 12 is released after the contents have been discharged, the body 12 of the outer layer 2 returns to its original shape. At this time, the discharge port is closed by the check valve, and outside air is introduced between the outer layer 2 and the inner layer 3 through the outside air intake hole 14, allowing only the body 12 of the outer layer 2 to return to its original shape while the inner layer 3 remains deformed and reduced in volume. Therefore, after the contents have been discharged, outside air is prevented from flowing into the storage space S from the opening 10, thus suppressing contact between the contents stored in the storage space S and preventing deterioration and alteration of the contents.

[0034] The outer layer 2 is provided with a cap seal portion 15 that is integrally connected to the lower end of the mouth portion 10. The cap seal portion 15 is cylindrical in shape with a larger diameter than the mouth portion 10, and its outer peripheral surface 15a is in contact with the inner peripheral surface of the cap 20 attached to the mouth portion 10.

[0035] Furthermore, the outer layer 2 is provided with a base portion 16 that is integrally connected to the lower end of the cap seal portion 15. The base portion 16 has a shape that is inclined at a predetermined angle α with respect to the axis O of the mouth portion 10 such that its outer peripheral surface 16a is located radially outward towards the lower side. The outer peripheral surface 16a of the base portion 16 abuts against or is close to the lower end of the cap 20 attached to the mouth portion 10.

[0036] Furthermore, the outer layer 2 has a straight section 17 that is integrally connected to the lower end of the base section 16 and integrally connected to the upper end of the shoulder section 11. The straight section 17 is cylindrical in shape, with its outer surface 17a having an outer diameter corresponding to the lower end of the base section 16 and parallel to the axis O of the mouth section 10. The shoulder section 11 is connected to the lower end of the straight section 17 so as to smoothly expand in diameter. In addition, the straight section 17 may have a substantially parallel configuration in which the outer surface 17a is inclined at an angle of 10° or less with respect to the axis O of the mouth section 10 in a longitudinal cross-section passing through the axis O.

[0037] In this way, by giving the outer layer 2 a shape that includes a straight section 17 in addition to the cap seal section 15 and the base section 16, the laminated peel-off container 1 can be given a smart appearance and its aesthetic appearance can be enhanced.

[0038] The outer layer 2 has concave ribs 18 that extend vertically from the straight section 17 to the shoulder section 11. In this embodiment, the outer layer 2 has two concave ribs 18 arranged evenly in the circumferential direction on each of the pair of outside air intake holes 14, on both the left and right sides of the circumferential position of the outside air intake holes 14. That is, four concave ribs 18 are provided below one outside air intake hole 14, and four concave ribs 18 are also provided below the other outside air intake hole 14. Four concave ribs 18 are provided below each outside air intake hole 14 of the outer layer 2. The number of concave ribs 18 can be changed in various ways.

[0039] Each concave rib 18 is formed as a concave rib with a semicircular cross-section that is recessed toward the inside of the container. The shape of the inner layer 3 corresponding to the portion of the outer layer 2 where the concave ribs 18 are provided is also a concave rib. The depth of the concave ribs 18 gradually increases from the upper end 18a and the lower end toward the center in the vertical direction, and remains approximately constant in the central part. The upper end 18a of each concave rib 18 is located on the straight section 17. The lower end of each concave rib 18 may be located on the shoulder section 11 or on the body section 12.

[0040] By providing such concave ribs 18, it is possible to suppress the inner layer 3 from completely re-adhering to the outer layer 2 in the area surrounding the concave ribs 18 during the initial peeling process, thereby forming a gap between the inner layer 3 and the outer layer 2. As for the initial peeling process, for example, one method is to blow air in through the outside air intake hole 14 or suck air from inside the inner layer 3 through the opening of the mouth 10 to peel the inner layer 3 of the molded laminated peeling container 1 from the outer layer 2, and then return the inner layer 3 to its original position by pressurizing air in through the opening of the mouth 10. Furthermore, by forming a gap between the inner layer 3 and the outer layer 2 in the area surrounding the concave ribs 18 through the initial peeling process as described above, it becomes easier to introduce outside air between the inner layer 3 and the outer layer 2 through the gap via the outside air intake hole 14 during use (when discharging the contents).

[0041] In the laminated peel-off container 1 to the contents-filled container 30 of this embodiment having the above configuration, the wall thickness of the inner layer 3 inside the straight section 17 is in the range of 0.1 to 0.3 mm.

[0042] Furthermore, as shown in Figure 4, in the laminated peeling container 1 to the contents-filled container 30 of this embodiment having the above configuration, the vertical length L of the base portion 16 is in the range of 1.0 to 5.0 mm, and the angle α of the outer peripheral surface 16a of the base portion 16 with respect to the axis O is in the range of 100 to 155°.

[0043] Furthermore, as shown in Figure 4, in the laminated peeling container 1 to the contents-filled container 30 of this embodiment having the above configuration, the vertical distance D from the lower end of the base portion 16 to the upper end 18a of the concave rib 18 is in the range of 4.0 to 12.0 mm.

[0044] As described above, in the laminated peel-off container 1 or the contents-filled container 30 of this embodiment, the thickness of the inner layer 3 inside the straight portion 17 constituting the outer layer 2 is set to a range of 0.1 to 0.3 mm, the vertical length L of the base portion 16 is set to a range of 1.0 to 5.0 mm, the angle α of the outer peripheral surface 16a of the base portion 16 with respect to the axis O is set to a range of 100 to 155°, and the vertical distance D from the lower end of the base portion 16 to the upper end 18a of the concave rib 18 is set to a range of 4.0 to 12.0 mm. Therefore, during the initial peel-off process, the inner layer 3 is effectively suppressed from completely re-adhering to the outer layer 2 in the area surrounding the concave rib 18, while increasing the impact resistance of the inner layer 3. Even if the contents-filled container 30 using this laminated peel-off container 1 is dropped in an inverted position and subjected to an impact to the mouth portion 10, it is possible to prevent damage such as cracking from occurring in the inner layer 3 at the portion corresponding to the upper end 18a of the concave rib 18.

[0045] Furthermore, if the vertical distance D from the lower end of the base portion 16 to the upper end 18a of the concave rib 18 is less than 4.0 mm, when the base portion 16 deforms due to an impact applied to the mouth portion 10 or when the lower end of the cap 20 collides with the base portion 16 as a result of such impact, there is a risk that cracks or other damage may occur in the inner layer 3 at the portion corresponding to the upper end 18a of the concave rib 18 due to such deformation. On the other hand, if the vertical distance D from the lower end of the base portion 16 to the upper end 18a of the concave rib 18 is made larger than 12.0 mm, the inner layer 3 becomes less likely to separate from the outer layer 2 at the boundary between the lower end of the base portion 16 and the upper end of the straight portion 17, making it difficult to secure an airway for the outside air introduced from the outside air intake hole 14.

[0046] In this embodiment, the contents-filled container 30 preferably has a content volume of 330 to 700 g. In this case, the total weight of the contents-filled container 30, including the laminated release container 1, the cap 20, and the contents, is preferably 400 g or more.

[0047] Because the laminated peel-off container 1 has the above configuration, even when the container 30 containing contents holds 330 to 700 g of contents and the total weight is 400 g or more, it is possible to prevent damage such as cracking from occurring in the inner layer 3 at the portion corresponding to the upper end 18a of the concave rib 18 when the container 30 containing contents is dropped in an inverted position and an impact is applied to the opening 10.

[0048] To confirm the effects of the present invention, ten laminated peeling containers of the embodiment were prepared, having the same configuration as the laminated peeling container 1 described above, but with a vertical distance D of 5.0 mm from the lower end of the base portion 16 to the upper end 18a of the concave rib 18. Five laminated peeling containers of the comparative example were also prepared, with a vertical distance D of 2.0 mm from the lower end of the base portion 16 to the upper end 18a of the concave rib 18. 360 g of water was filled into each laminated peeling container, a cap was attached to the opening, the temperature was adjusted in a 5°C constant temperature bath, and then an impact resistance test was performed by dropping the containers five times from a height of 1.2 m onto a concrete floor.

[0049] The impact resistance test results showed that all five comparative laminated peel-off containers developed cracks in the inner layer inside the concave ribs after the first to fourth drops. In contrast, none of the ten example laminated peel-off containers developed cracks in the inner layer inside the concave ribs, confirming that they had improved impact resistance compared to the comparative laminated peel-off containers.

[0050] The present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the invention.

[0051] For example, in the above embodiment, a pair of outside air intake holes 14 are provided in the opening 10, but there may be one or three or more outside air intake holes 14, and their positions can be changed as appropriate.

[0052] Furthermore, in the above embodiment, the body portion 12 is configured to have a plurality of circumferential grooves 12a, but its shape and the presence or absence of circumferential grooves 12a can be changed in various ways. [Explanation of Symbols]

[0053] 1. Laminated peeling container 2 Outer body 3. Inner layer 10 Mouth 10a Male thread 11 Shoulder 12 Torso 12a Circumferential groove 13 Bottom 13a Pinch-off section 14. Outside air intake vent 15 Cap seal section 15a Outer surface 16. Base 16a Outer surface 17. Straight section 17a Outer surface 18 Concave Ribs 18a top end 20 caps 30 containers containing contents S storage space O axis α angle

Claims

1. A bottle-shaped outer layer having a mouth, shoulder, body and bottom, It has a storage space for contents and a volume-reducing, deformable inner layer that is peelably laminated on the inner surface of the outer layer, A laminated peeling container made of synthetic resin, wherein an air intake hole is provided at the opening between the outer layer and the inner layer, A cap seal portion is provided in conjunction with the lower end of the opening, and its outer surface abuts against the inner surface of the cap that is fitted to the opening, A base portion is provided in conjunction with the lower end of the cap seal portion, and is inclined at a predetermined angle such that the outer surface is located radially outward towards the lower side, A cylindrical straight section is provided, which is connected to the lower end of the base portion and to the upper end of the shoulder portion, and whose outer surface is substantially parallel to the axis of the mouth portion, It has a concave rib that extends vertically from the straight portion to the shoulder portion, with its upper end positioned in the straight portion, The thickness of the inner layer body inside the straight portion is 0.1 to 0.3 mm. The vertical length of the base portion is 1.0 to 5.0 mm, and the angle is 100 to 155°. A laminated peeling container characterized in that the vertical distance from the lower end of the base portion to the upper end of the concave rib is 4.0 to 12.0 mm.

2. A pair of outside air intake holes are provided symmetrically across the axis of the opening. The laminated peeling container according to claim 1, wherein at least one concave rib is provided on each of the left and right sides below each of the outside air intake holes, straddling the circumferential position of the outside air intake hole.

3. A laminated peeling container according to claim 1 or 2, A cap attached to the opening of the aforementioned laminated peeling container, The contents stored in the aforementioned storage space are, A container containing contents, characterized by having a net weight of 330 to 700 g.

4. A container containing contents according to claim 3, wherein the weight is 400g or more.

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