Double container

Abstract

To provide a double container capable of preventing an inner layer body from unintentionally coming out from an outer layer body during use and capable of easily separating.SOLUTION: In the double container 1, one of the inner layer body 3 and the outer layer body 2 at the mouth part 1a has a convex portion 4, and the other of the inner layer body and outer layer body at the mouth part has a hole 5 having an open portion and a stopper surface, a stepped-over portion 6 having a circumferential locking surface, and a vertical locking surface, the convex portion enters the hole through the open portion and further climbs over the stepped-over portion to one side in the circumferential direction, thereby entering a restricted state in which its movement is restricted, the convex portion is restricted from moving to the other circumferential side by abutting against the circumferential locking surface, and its movement to the other vertical side is restricted by abutting against the vertical locking surface, and as the convex portion climbs over the stepped-over portion to the other circumferential side from the restricted state, its further movement to the other circumferential side is restricted by abutting against the stopper surface, and it moves to the other vertical side from the state in abutment against the stopper surface, thereby escaping from within the hole through the open portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a double container. [Background technology]

[0002] A double container is known which has a mouth, a body and a bottom connected in that order, is composed of an outer layer and an inner layer, and can be separated by removing the inner layer from the outer layer when it is stacked inside the outer layer (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-111537 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a double container which can prevent the inner layer from coming out of the outer layer unintentionally during use and which can be easily separated. [Means for solving the problem]

[0005] One aspect of the present invention is as follows.

[0006] [1] A double container having a mouth, a body, and a bottom connected in this order, and composed of an outer layer and an inner layer, wherein the inner layer can be removed from the outer layer after being stacked inside the outer layer, and can be separated, In the mouth portion, one of the inner layer body and the outer layer body has a convex portion that protrudes toward the other of the inner layer body and the outer layer body in the radial direction of the mouth portion, In the mouth portion, the other of the inner layer body and the outer layer body has a hole portion having a recess, an opening portion and a stopper surface in the radial direction of the mouth portion, a stepped-over portion having a circumferential engaging surface, and a vertical engaging surface provided in the hole portion or the stepped-over portion, The convex portion passes through the opening portion to one side in the vertical direction and enters the hole portion, and then climbs over the climbing portion to one side in the circumferential direction, thereby entering a restricted state in which movement within the hole portion is restricted, In the restricted state, the protrusion is restricted from moving toward the other circumferential side by contact with the circumferential locking surface, and is restricted from moving toward the other vertical side by contact with the vertical locking surface, The convex portion climbs over the climb-over portion to the other circumferential side from the restricted state, and is restricted from further movement to the other circumferential side by abutting against the stopper surface, and by moving to the other vertical side from the state abutting against the stopper surface, it passes through the open portion to the other vertical side and leaves the hole portion, a double container.

[0007] [2] The hole portion has a circumferential groove portion that extends in a circumferential direction and has an end wall surface that terminates on one side in the circumferential direction, and the other vertical side groove wall surface of the circumferential groove portion has the crossing portion that protrudes toward the one vertical side groove wall surface, In the restricted state, the protrusion is restricted from moving toward the one side in the circumferential direction by contacting the end wall surface, The convex portion has a circumferential extending portion that extends in the circumferential direction between the crossing portion and the one vertical gutter wall surface in the regulated state, and a crossing portion that extends from the circumferential extending portion to the other vertical side and is positioned between the crossing portion and the terminal wall surface, double container described in [1].

[0008] [3] The circumferential extending portion has the overhanging portion at the end on one circumferential side, is guided in the circumferential direction by the vertical one side groove wall surface of the circumferential groove portion, and the end face on the other circumferential side of the circumferential extending portion can abut the stopper surface. [2] A double container as described in. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a double container that can prevent the inner layer from unintentionally coming out of the outer layer during use and that can be easily separated. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing a double container according to one embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view of the double container shown in FIG. [Figure 3] 10 is an explanatory diagram illustrating the movement of the convex portion relative to the hole portion during separation. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] As shown in Figures 1 to 3, in one embodiment of the present invention, the double container 1 has a mouth 1a, a body 1b, and a bottom 1c connected in this order, and is composed of an outer layer 2 and an inner layer 3. The inner layer 3 is in close contact with or close to the outer layer 2, so that the inner layer 3 can be removed from the outer layer 2 in a separated state from the state in which it is stacked inside the outer layer 2 (the state shown in Figures 1 and 2). One of the inner layer body 3 and the outer layer body 2 (in this embodiment, the inner layer body 3) has a convex portion 4 that protrudes toward the other of the inner layer body 3 and the outer layer body 2 (in this embodiment, the outer layer body 2) in the radial direction of the mouth portion 1a, and the other of the inner layer body 3 and the outer layer body 2 at the mouth portion 1a has a hole portion 5 having a recessed open portion 5a and a stopper surface 5b in the radial direction of the mouth portion 1a, a stepped-over portion 6 having a circumferential locking surface 6a, and an upper and lower locking surface 6b provided in the hole portion 5 or the stepped-over portion 6 (in this embodiment, the stepped-over portion 6). and a stopper surface 6b facing the hole 5, and the protrusion 4 passes through the opening 5a to one side in the vertical direction (the bottom side in this embodiment, the bottom side in Figure 3), and then passes over the stepped-over portion 6 to one side in the circumferential direction (the left side in Figure 3), thereby entering a restricted state (the state shown by the solid line in Figure 3) in which its movement within the hole 5 is restricted, and in the restricted state, the protrusion 4 is restricted from moving to the other circumferential side (the right side in Figure 3) by abutting against the circumferential stopper surface 6a, and is restricted from moving to the other vertical side (the top side in this embodiment, the top side in Figure 3) by abutting against the vertical stopper surface 6b, and as the protrusion 4 passes over the stepped-over portion 6 to the other circumferential side from the restricted state, its further movement to the other circumferential side is restricted by abutting against the stopper surface 5b, and by moving to the other vertical side from the state in which it abuts against the stopper surface 5b, it passes through the opening 5a to the other vertical side and leaves the hole 5.

[0013] In this embodiment, the direction along the central axis O of the mouth 1a is referred to as the vertical direction, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction going around the central axis O is referred to as the circumferential direction.

[0014] In this embodiment, the inner layer 3 has the convex portion 4 and the outer layer 2 has the hole portion 5, but this is not limited thereto, and the inner layer 3 may have the hole portion 5 and the outer layer 2 may have the convex portion 4. In this case, one side in the vertical direction is the upper side, and the other side in the vertical direction is the lower side. When the inner layer 3 has the convex portion 4 and the outer layer 2 has the hole portion 5, the hole portion 5 may be a bottomed hole as in this embodiment, or may be a through hole (not shown). In this embodiment, the body 1b has a shoulder region 1b1 that extends downward from the lower end of the mouth 1a while widening, and a body main body region 1b2 that extends downward from the lower end of the shoulder region 1b1 to the bottom 1c, but this is not limited thereto.

[0015] By attaching the attachment portion of the dispenser (not shown) to the mouth 1a of the double container 1 (in this embodiment, it is attached only to the inner layer 3; however, it may also be attached to the outer layer 2 or to both the outer layer 2 and the inner layer 3), a dispenser container can be formed that can dispense contents, such as liquid, contained within the inner layer 3 of the stacked double container 1. The dispenser is, for example, a dispenser cap (e.g., a hinged cap) with a discharge port, or a dispenser pump. During use, when contents are contained in the double container 1 and are dispensed at the appropriate time from the dispenser, the convex portion 4 is in a restricted state, so that the vertical engagement surface 6b can prevent the inner layer 3 from coming out of the outer layer 2 to the other side in the vertical direction. When the contents are used up and the container is to be disposed of separately, the inner layer body 3, together with the cap, is twisted in the other circumferential direction relative to the outer layer body 2, for example, so that the protrusion 4 overcomes the overriding portion 6 and abuts against the stopper surface 5b, as shown by the thick arrow in Fig. 3. From this state, the operator can then lift the inner layer body 3 up relative to the outer layer body 2, as shown by the hollow arrow in Fig. 3, to complete the separation. At this time, the abutment of the protrusion 4 against the stopper surface 5b lets the operator know that the separation can be completed by simply lifting the inner layer body 3 (i.e., that it has been twisted sufficiently). This prevents the inner layer body 3 from unintentionally coming out of the outer layer body 2 during use, and also makes separation easy.

[0016] The hole portion 5 has a circumferential groove portion 7 that extends circumferentially and has an end wall surface 7c that terminates on one circumferential side, and the other vertical groove wall surface of the circumferential groove portion 7 (the upper groove wall surface 7a in this embodiment) has a to-be-ridden portion 6 that protrudes convexly toward one vertical groove wall surface (the lower groove wall surface 7b in this embodiment), and the portion of the to-be-ridden portion 6 facing one circumferential side forms a circumferential locking surface 6a, and in the restricted state, the convex portion 4 is restricted from moving toward one circumferential side by abutting against the end wall surface 7c of the circumferential groove portion 7, and the convex portion 4 has a circumferential extending portion 4a that extends circumferentially between the to-be-ridden portion 6 and the lower groove wall surface 7b in the restricted state, and a climbing portion 4b that extends from the circumferential extending portion 4a to the other vertical side and is positioned between the to-be-ridden portion 6 and the end wall surface. According to the above configuration, by inserting the convex portion 4 into the circumferential groove portion 7 inside the hole portion 5 toward one circumferential side, the riding portion 4b of the convex portion 4 rides over the stepped-over portion 6 due to elastic deformation while the circumferential extending portion 4a remains held within the hole portion 5, and the convex portion 4 abuts against the terminal wall surface 7c of the circumferential groove portion 7 and stops, thereby stably bringing the convex portion 4 into a restricted state. Furthermore, by performing the reverse operation, the convex portion 4 can be stably brought from the restricted state into a state in which it abuts against the stopper surface 5b.

[0017] The circumferentially extending portion 4a has a crossing portion 4b at one end in the circumferential direction, and is guided in the circumferential direction by the lower groove wall surface 7b of the circumferential groove portion 7. The other end surface of the circumferentially extending portion 4a can abut against the stopper surface 5b. This configuration facilitates stable operation of the protrusion 4 within the hole 5. Note that, when the vertical position of the inner layer body 3 relative to the outer layer body 2 is determined by the mounting portion 3a2 (described later), there are cases where the lower surface of the circumferentially extending portion 4a does not come into contact with the lower groove wall surface 7b (i.e., the circumferentially extending portion 4a is not guided in the circumferential direction by the lower groove wall surface 7b). In this case, the mounting portion 3a2 and the protrusion 4 may be configured to clamp the upper groove wall surface 7a (crossing portion 6) of the outer layer body 2. This configuration allows for suppression of vertical wobble between the preforms during stacking. Furthermore, in the double container 1, regardless of whether or not the above-mentioned clamping is performed, the outer layer 2 is positioned between the mounting portion 3a2 of the inner layer 3 and the inner layer 3 in the shoulder region 1b1 in the vertical direction, thereby suppressing vertical rattling of the inner layer 3 relative to the outer layer 2.

[0018] The vertical locking surface 6b is formed by the lower surface of the crossing portion 6. However, the vertical locking surface 6b is not limited to this, and may be formed, for example, by a portion of the upper groove wall surface 7a of the circumferential groove portion 7 that is located on one circumferential side of the crossing portion 6, or by a portion of the upper groove wall surface 7a of the circumferential groove portion 7 that is located on the other circumferential side of the crossing portion 6.

[0019] The hole portion 5 is shaped so that when the protrusion 4 abuts against the stopper surface 5b, it can be removed from the hole portion 5 through the opening portion 5a by pulling the protrusion 4 straight up in the other vertical direction (upward in this embodiment).

[0020] In this embodiment, the double container 1 is manufactured by assembling a bottomed, cylindrical inner preform into a bottomed, cylindrical outer preform to form a laminated preform (not shown), and then blow-molding the laminated preform into the shape of the double container 1. During blow-molding, the portion below the mouth 1a is stretched, for example, by biaxial stretching. The outer preform forms the outer layer 2, and the inner preform forms the inner layer 3. The protrusion 4 and the hole 5 are provided at the mouth 1a from the laminated preform state. When the inner preform is assembled into the outer preform, the protrusion 4 enters the hole 5 and is restricted. The hole 5 has an inclined surface 5c that extends from the upper end of the stopper surface 5b toward the other circumferential side in the other vertical direction. The inclined surface 5c can guide the protrusion 4 into the hole 5 when the inner preform forming the inner layer 3 is attached to the outer preform forming the outer layer 2. Alternatively, the stopper surface 5b may be extended to the upper end of the hole 5 without providing the inclined surface 5c.

[0021] The outer preform (outer layer 2) and the inner preform (inner layer 3) are each formed from a resin material. Examples of resin materials include polyolefins such as polypropylene (PP) and polyethylene (PE), polyesters such as polyethylene terephthalate (PET), and other resins. The materials for the outer layer 2 and the inner layer 3 can be appropriately selected so that the inner layer 3 can be separated and sorted from the outer layer 2. The double container 1 may be configured as a delaminating container in which outside air is introduced between the inner layer 3 and the outer layer 2 through an outside air inlet (not shown) as the contents contained in the inner layer 3 are discharged.

[0022] The double container 1 has two fitting structures 8, each consisting of a protrusion 4, a hole 5, and a crossing portion 6, at positions offset in the circumferential direction. The number of fitting structures 8 provided on the double container 1 is not limited to this, and may be one, or three or more. In Fig. 1, the shape of the fitting structure 8 as viewed from the front is shown by a two-dot chain line.

[0023] The inner layer 3 has an inner opening 3a, the outer layer 2 has an outer opening 2a, the opening 1a is composed of the inner opening 3a and the outer opening 2a, and the inner opening 3a has a co-rotating fitting portion 3a1 on at least the other circumferential side that fits into the attachment portion of the dispenser so as to be co-rotatable. The co-rotating fitting portion 3a1 has a plurality of ribs 9 that are provided on the outer peripheral surface of the co-rotating fitting portion 3a1 at positions shifted in the circumferential direction and fit into the attachment portion, and a downward-facing stepped surface 10 that is provided on the outer peripheral surface of the co-rotating fitting portion 3a1 and fits into the attachment portion, but is not limited to this.

[0024] The inner opening 3a has a flange-shaped mounting portion 3a2 that rests on the upper end surface of the outer opening 2a. The mounting portion 3a2 abuts or is close to the upper end surface of the outer opening 2a when the protrusion 4 is in the preparatory position (the position indicated by the lower two-dot chain line in FIG. 3 ) where the other circumferential end face of the circumferentially extending portion 4a faces the stopper surface 5b, when the protrusion 4 is in a restricted state (restricted position), or when the protrusion 4 is positioned between the preparatory position and the restricted position. The mounting portion 3a2 allows the protrusion 4 to be positioned in a preferred position relative to the hole 5. The opening portion 5a of the hole 5 extends to the upper end surface of the outer opening 2a. The hole 5 has a circumferential groove 7 having an upper groove wall surface 7a, a lower groove wall surface 7b, and a terminal wall surface 7c, and a lower wall surface 5d that extends from the lower groove wall surface 7b of the circumferential groove 7 to the lower end of the stopper surface 5b.

[0025] The mouth portion 1a is formed so that its lower end is gradually thinned downward by the stretching during blow molding. With this configuration, during separation, the inner layer body 3 can be easily removed from the outer layer body 2 by simply pulling it straight up in the other direction from the state in which the protrusion 4 is in the ready position.

[0026] The outer opening 2a has a neck ring 2a1 near the lower end of the opening 1a, but is not limited to this.

[0027] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Explanation of symbols]

[0028] 1 double container 1a Mouth 1b Torso 1b1 shoulder area 1b2 Body area 1c bottom 2 Outer body 2a External opening 2a1 neck ring 3 Inner layer 3a Inner mouth 3a1 Co-rotating fitting part 3a2 Placement section 4 Convex part 4a circumferential extension part 4b overhanging part 5 hole part 5a opening part 5b stopper surface 5c inclined surface 5d lower side wall surface 6 overhanging part 6a circumferential locking surface 6b vertical locking surface 7 circumferential groove part 7a upper side groove wall surface 7b lower side groove wall surface 7c terminal wall surface 8 fitting structure 9 rib 10 step surface O central axis

Claims

1. A double container having a mouth, a body, and a bottom connected in this order, and composed of an outer layer and an inner layer, wherein the inner layer can be removed from the outer layer after being stacked inside the outer layer, and can be separated, In the mouth portion, one of the inner layer body and the outer layer body has a convex portion that protrudes toward the other of the inner layer body and the outer layer body in the radial direction of the mouth portion, In the mouth portion, the other of the inner layer body and the outer layer body has a hole portion having a recess, an opening portion and a stopper surface in the radial direction of the mouth portion, a stepped-over portion having a circumferential engaging surface, and a vertical engaging surface provided in the hole portion or the stepped-over portion, The convex portion passes through the opening portion to one side in the vertical direction and enters the hole portion, and then climbs over the climbing portion to one side in the circumferential direction, thereby entering a restricted state in which movement within the hole portion is restricted, In the restricted state, the protrusion is restricted from moving toward the other circumferential side by contact with the circumferential locking surface, and is restricted from moving toward the other vertical side by contact with the vertical locking surface, The convex portion climbs over the climb-over portion to the other circumferential side from the restricted state, and is restricted from further movement to the other circumferential side by abutting against the stopper surface, and by moving to the other vertical side from the state abutting against the stopper surface, it passes through the open portion to the other vertical side and leaves the hole portion, a double container.

2. The hole portion has a circumferential groove portion that extends in a circumferential direction and has an end wall surface that terminates on one side in the circumferential direction, and the other vertical side groove wall surface of the circumferential groove portion has the crossing portion that protrudes toward the one vertical side groove wall surface, In the restricted state, the protrusion is restricted from moving toward the one side in the circumferential direction by contacting the end wall surface, The double container described in claim 1, wherein the convex portion has a circumferential extending portion that extends in the circumferential direction between the stepped-over portion and the one vertical groove wall surface in the regulated state, and a step-over portion that extends from the circumferential extending portion to the other vertical side and is positioned between the stepped-over portion and the terminal wall surface.

3. The double container described in claim 2, wherein the circumferential extending portion has the overhang portion at the end on one circumferential side, is guided in the circumferential direction by the vertical one side groove wall surface of the circumferential groove portion, and the end face on the other circumferential side of the circumferential extending portion can abut the stopper surface.

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