Paper lids and packaging containers

Abstract

To provide a paper lid material that has a simple structure and can be easily sealed. [Solution] A paper lid material 1A is attached to a packaging body 2 for storing an article M so as to cover an article dispensing opening 3 provided in the packaging body 2, and comprises a main body 20 having a base portion 23 provided with an opening 25 corresponding to the article dispensing opening 3, and a lid 30 connected to the main body 20 so as to be openable and closable via a hinge 40, wherein the lid 30 has a cover portion 31 that covers the opening 25 and abuts against the inner peripheral edge of the opening 25 when closed relative to the main body 20. Preferably, the main body 20 has a support portion 24 that supports the base portion 23 so that the base portion 23 is spaced apart from the packaging body 2.

Description

Technical Field

[0001] The present invention relates to a paper lid member attached to a packaging body so as to cover an article outlet provided in the packaging body for storing an article, and a packaging container provided with the paper lid member.

Background Art

[0002] In recent years, decarbonization without using plastic materials has been demanded in packaging containers. In addition, plastic packaging containers have also become one of the factors causing environmental problems such as marine pollution. Therefore, it has been proposed to form a lid member that was conventionally formed using plastic using a paper-based material (for example, see Patent Document 1).

[0003] Patent Document 1 discloses a paper lid member provided so as to close an opening for taking out a cleaning sheet in a packaging body storing a cleaning sheet such as a wet tissue. This lid member includes a lid portion, a base portion, and a hinge portion, and the lid portion and the base portion are integrally connected via the hinge portion, and it is possible to set the lid in an open state or a closed state by rotating the lid portion around the hinge portion.

[0004] In the above lid member, the lid portion includes a side wall portion formed in a tapered shape upward in the closed state. On the other hand, the base portion includes a surrounding wall formed in a tapered shape upward so as to rise from the attachment portion to the packaging body. In this lid member, the inner wall constituting the inner wall of the side wall portion in the lid portion is formed in a similar shape along the outer wall constituting the outer wall of the surrounding wall in the base portion, and when the lid portion is closed with respect to the base portion, the surrounding wall is configured to fit inside the side wall portion.

[0005] In the lid member disclosed in Patent Document 1, when the lid is rotated in the closing direction relative to the base, using the hinge as a pivot point, the inner wall of the side wall near the hinge and the outer wall of the surrounding wall come into partial contact. Furthermore, as the lid is rotated in the closing direction, the area in which the inner wall of the side wall and the outer wall of the surrounding wall come into partial contact expands. When the lid is rotated until it is completely closed relative to the base, the inner wall of the side wall and the outer wall of the surrounding wall come into overall contact, and the lid is sealed to the base. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 6770787 [Overview of the project] [Problems that the invention aims to solve]

[0007] In the lid member disclosed in Patent Document 1, in order to create a structure that seals the lid portion to the base, a tapered surrounding wall must be provided on the base, and a tapered side wall portion must be provided on the lid portion into which the surrounding wall fits, resulting in a complex structure. Furthermore, in order to seal the lid portion to the base, the inner wall of the side wall portion and the outer wall of the surrounding wall portion must be brought from a state of partial contact to a state of complete contact. In this case, since the surrounding wall portion is fitted to the side wall portion in a tightening state, the lid portion must be pressed against the base portion with a certain amount of pressure or more, making it difficult to easily achieve a sealed state.

[0008] This invention has been made in view of the above problems, and aims to provide a paper lid material that can be easily sealed with a simple structure, and a packaging container equipped with the paper lid material. [Means for solving the problem]

[0009] The characteristic configuration of the paper lid material according to the present invention, which solves the above problems, is as follows: A paper lid material attached to a packaging body for storing goods, such as to cover the opening for dispensing the goods provided in the packaging body, A main body having a base portion provided with an opening corresponding to the article dispensing outlet, A lid is attached to the main body via a hinge so as to be openable and closable, Equipped with, The lid, when closed relative to the main body, has a cover portion that covers the opening and abuts against the inner periphery of the opening.

[0010] With this paper lid configuration, when the lid is closed, the opening provided in the base of the main body is covered by the cover portion, and the cover portion abuts against the inner periphery of the opening. Thus, with a simple structure in which the lid has a cover portion that covers the opening in the base portion and abuts against the inner periphery of the opening when the lid is closed, a sealed state can be easily achieved simply by closing the lid on the main body.

[0011] In the paper lid material according to the present invention, Preferably, the main body further has a support portion that supports the base portion such that the base portion is spaced apart from the packaging body.

[0012] With this paper lid configuration, the base portion is supported by the support portion so that it is spaced apart from the packaging body, or in other words, the base portion is floating relative to the packaging body. As a result, the cover portion can be brought into contact with the inner periphery of the opening of the base portion without interfering with the packaging body, and a secure seal can be achieved simply by closing the lid on the main body.

[0013] In the paper lid material according to the present invention, Preferably, the cover portion has a tapered surface that narrows in the closing direction of the lid so that it contacts the inner peripheral edge of the opening in line when the lid is closed.

[0014] With this paper lid material configuration, even if the paper lid material expands or contracts due to moisture absorption / release caused by changes in humidity, for example, the amount of pressure applied to the opening in the base of the main body by the tapered surface of the cover portion, which tapers towards the closing direction of the lid, can be changed to ensure that the tapered surface makes reliable line contact with the inner edge of the opening. Therefore, the reliability of the sealing performance during actual use, which involves changes in humidity, can be improved.

[0015] In the paper lid material according to the present invention, Preferably, the cover portion has a concave surface formed by recessing in the opening direction of the lid, at least the portion facing the article dispensing opening when the lid is closed.

[0016] With this paper lid configuration, when the lid is closed, a space is secured between the concave surface of the cover and the item dispensing opening to accommodate the portion of the item that protrudes from the item dispensing opening. This prevents problems such as the lid not closing completely due to interference with the portion of the item protruding from the item dispensing opening.

[0017] In the paper lid material according to the present invention, It is preferable to further provide a locking means for maintaining the closed state.

[0018] With this paper lid configuration, the locking mechanism for maintaining the closed state prevents the lid from unintentionally opening relative to the main body.

[0019] In the paper lid material according to the present invention, The aforementioned locking means is A tongue-shaped piece extending from the cover portion or the base portion at a position spaced apart from the hinge, A locking claw piece is provided on the base portion or the cover portion so as to be able to engage with the tongue-shaped piece in the closed lid state, It is preferable that it includes.

[0020] According to the paper lid material of this structure, since the tongue-like piece extends from the cover part or the base part at a position away from the hinge, it becomes easier to hook a finger on the tongue-like piece from the opposite side of the hinge, and by a predetermined operation on the tongue-like piece, the tongue-like piece can be easily engaged with the locking piece.

[0021] In the paper lid material according to the present invention, the tongue-like piece has a convex part that protrudes relatively laterally and a concave part that is recessed relatively, it is preferable that the locking claw piece has concave parts and convex parts whose shapes match those of the convex part and the concave part of the tongue-like piece in a plan view.

[0022] According to the paper lid material of this structure, when the tongue-like piece is pushed in along the plan view direction with respect to the locking claw piece, the convex part and the concave part provided on the tongue-like piece and the concave part and the convex part provided on the locking claw piece are fitted together. Thereby, the tongue-like piece can be temporarily locked to the locking claw piece by a frictional locking force corresponding to the number, fitting depth, coefficient of friction, etc. of the concave and convex parts that are fitted to each other in the tongue-like piece and the locking claw piece. Further, when the tongue-like piece is pushed in along the plan view direction with respect to the locking claw piece from the temporarily locked state, due to the bending of the tongue-like piece, the phases of the convex part and the concave part provided on the tongue-like piece with respect to the concave part and the convex part provided on the locking claw piece are shifted in a direction orthogonal to the plan view direction, that is, the horizontal direction. Therefore, the convex parts of the tongue-like piece and the locking claw piece partially overlap in a plan view. Thereby, the convex parts of the tongue-like piece and the locking claw piece are hooked to each other, and the tongue-like piece can be more firmly locked to the locking claw piece.

[0023] In the paper lid material according to the present invention, it is preferable that the main body has a horizontally long shape in a plan view, and the hinge is provided on one side in the longitudinal direction of the main body.

[0024] With this paper lid configuration, when the lid is rotated in the closing direction relative to the main body, using the hinge as a pivot point, the inner periphery of the opening in the base portion near the hinge and the cover portion come into partial contact. Furthermore, when the lid is rotated in the closing direction, the area in which the inner periphery of the opening in the base portion and the cover portion come into partial contact expands along the longitudinal direction of the main body from one side where the hinge is located to the other. When the lid is rotated until it is completely closed relative to the main body, the inner periphery of the opening in the base portion and the cover portion come into full contact, and the lid is sealed against the main body. In this way, the area in which the inner periphery of the opening in the base portion and the cover portion come into partial contact gradually expands along the longitudinal direction of the main body, and finally the inner periphery of the opening in the base portion and the cover portion come into full contact. Combined with the centering action in the short direction of the main body acting between the inner periphery of the opening in the base portion and the cover portion, the operation of closing the lid to the main body to create a sealed state can be performed smoothly and reliably.

[0025] Next, the characteristic configuration of the packaging container according to the present invention for solving the above problems is as follows: A packaging body for storing goods, The above-described paper lid material is attached to the packaging so as to cover the article dispensing opening provided in the packaging, The goal is to provide for it.

[0026] This packaging container has a simple structure that allows for easy sealing, and when opened, the contents can be easily removed through the outlet provided on the packaging and the opening on the base.

[0027] In the packaging container according to the present invention, The aforementioned article is preferably a cleaning sheet.

[0028] With this packaging container configuration, even items containing a lot of moisture, such as cleaning wipes, can be securely sealed by the paper lid attached to the packaging, thus preventing the items from drying out and deteriorating due to drying. [Brief explanation of the drawing]

[0029] [Figure 1] Figure 1 is an overall perspective view of a packaging container equipped with a paper lid according to the first embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the main body and lid of the paper lid material of the first embodiment. [Figure 3] Figure 3 is a plan view of the unfolded state of the paper lid material of the first embodiment. [Figure 4] Figure 4 is an explanatory diagram of the lid closing operation relative to the main body. [Figure 5] Figure 5 is an explanatory diagram illustrating the operation of the locking means applied to the paper lid material of the first embodiment. [Figure 6] Figure 6 is an overall perspective view of a packaging container equipped with a paper lid according to a second embodiment of the present invention. [Figure 7] Figure 7 is a plan view of the unfolded state of the paper lid material according to the second embodiment. [Figure 8] Figure 8 is an explanatory diagram illustrating the operation of the locking mechanism applied to the paper lid material of the second embodiment. [Figure 9] Figure 9 is an overall perspective view of a packaging container equipped with a paper lid according to a third embodiment of the present invention. [Figure 10] Figure 10 is a cross-sectional view of the main body and lid of the paper lid material of the third embodiment. [Figure 11] Figure 11 is a plan view of the unfolded state of the paper lid material of the third embodiment. [Figure 12] Figure 12 is an explanatory diagram of the closing operation of the lid relative to the main body. [Figure 13] Figure 13 is an explanatory diagram illustrating the operation of the locking mechanism applied to the paper lid material of the third embodiment. [Figure 14] Figure 14 is an overall perspective view of a packaging container equipped with a paper lid according to a fourth embodiment of the present invention. [Figure 15] Figure 15 is a plan view of the unfolded state of the paper lid material according to the fourth embodiment. [Figure 16] Figure 16 is an explanatory diagram illustrating the operation of the locking mechanism applied to the paper lid material of the fourth embodiment. [Figure 17]Figure 17 is an explanatory diagram of a method for manufacturing paper lid material using a press molding machine. [Figure 18] Figure 18 is an overall perspective view of a packaging container equipped with a paper lid according to another embodiment. [Figure 19] Figure 19 is an explanatory diagram illustrating another configuration of the installation of the main body on the packaging. [Figure 20] Figure 20 is an explanatory diagram of another embodiment of the hinge. [Figure 21] Figure 21 is an explanatory diagram of another embodiment of the locking mechanism. [Figure 22] Figure 22 is an explanatory diagram of another method of bonding the main body and the packaging. [Figure 23] Figure 23 is an explanatory diagram of the positioning means for the tongue-shaped segment. [Figure 24] Figure 24 is an explanatory diagram of an embodiment in which a weakening portion is provided on the tongue-shaped flap. [Figure 25] Figure 25 is an explanatory diagram showing a configuration in which ribs are provided on the lid. [Modes for carrying out the invention]

[0030] The present invention will be described below with reference to the drawings. In the following embodiments, a packaging container to which the paper lid material of the present invention is applied will be used as an example to describe a packaging body containing items such as cleaning sheets like wet wipes. However, the present invention is not intended to be limited to the embodiments and configurations described below or shown in the drawings. In Figures 2, 4, 10, 12, 20, 22 and 25 show cross-sections of the body and lid, but the thickness of the cross-sections has been exaggerated for clarity in the drawings and does not strictly reflect the actual size (scale) of the body and lid.

[0031] [First Embodiment] <Overall Structure> Figure 1 is an overall perspective view of a packaging container 1A equipped with a paper lid material 10A according to the first embodiment of the present invention. Figure 1(a) shows the lid 30 in an open state, with the lid 30 open to approximately 120° relative to the main body 20. Figure 1(b) shows the lid 30 in a closed state, with the lid 30 closed relative to the main body 20 and locked by the locking means 50. The packaging container 1A shown in Figures 1(a) and (b) comprises a packaging body 2 for storing articles M and a paper lid material 10A attached by joining means so as to cover an article dispensing opening 3 provided in the packaging body 2. Examples of joining means for the paper lid material 10A to the packaging body 2 include joining with various adhesives such as hot melt, joining with adhesive tape, joining with heat seal, joining with heat fusion, etc., and known joining means can be appropriately selected and used.

[0032] <Package> The packaging body 2 is a bag whose appearance is formed in a pillow shape by sealing key points of a sheet material wrapped around the article M in an airtight manner using a joining means such as heat sealing. As the sheet material, for example, single or composite materials of synthetic resin sheets such as polyethylene, polypropylene, polyethylene terephthalate, polyamide, and polyvinyl chloride, or composite sheets made by laminating these synthetic resin sheets with aluminum foil, paper, etc., can be used. The shape of the packaging body 2 does not need to be limited to a pillow-shaped bag as in this example, as it does not need to have a surface on which a paper lid material 10A can be installed, but may also be a bottomed cylindrical shape or a hexahedral shape.

[0033] The top surface 2a of the packaging body 2 extends in a first direction (X direction) and a second direction (Y direction) that are mutually perpendicular in the horizontal plane, and is formed in a roughly rectangular shape in plan view, being relatively longer in the X direction and relatively shorter in the Y direction. The central part of the top surface 2a is set as the item removal area, and an item removal opening 3 for removing the item M is formed in this item removal area. In the state before use, the packaging body 2 is sealed by attaching a seal body 4 made of an airtight film or sheet to the top surface 2a so as to cover the item removal opening 3. When using the packaging body 2, the user can peel off the seal body 4 to open the package so that the item M can be removed.

[0034] The shape of the item dispensing opening 3 is not particularly limited, as long as it is a shape that allows the item M to be removed. Examples include an elliptical shape, a circular shape, a square shape, a square shape with rounded corners, a slit shape, etc. The item dispensing opening 3 includes not only shapes that are open to allow the item to be removed, but also shapes such as a cut (notch) that is closed with a reinforcing line or perforation before use, but can be opened when removing the item after the reinforcing line or perforation is broken.

[0035] <Paper lid material> The paper lid material 10A is mainly composed of paper and / or pulp-based materials. Examples of paper include water-resistant paper, oil-resistant paper, water-repellent paper, and oil-repellent paper. To prevent deterioration upon contact with article M, it is preferable to apply a coating agent to the surface and / or back surface of the paper or to attach a film. Examples of pulp-based materials include those mainly composed of pulp such as wood pulp, non-wood pulp, and recycled paper pulp, and it is preferable that they contain 50% or more pulp. Examples of materials other than pulp in pulp-based materials include non-pulp natural fibers, synthetic fibers, and recycled fibers.

[0036] The paper lid material 10A comprises a body 20, a lid 30, and a hinge 40. The body 20 and the lid 30 are connected via the hinge 40, and by rotating the lid 30 around the hinge 40, it is possible to achieve the open lid state shown in Figure 1(a) and the closed lid state shown in Figure 1(b). In Figure 1(a), the lid 30 is shown open to approximately 120° relative to the body 20, but in reality, the lid 30 can be opened to approximately 180° relative to the body 20.

[0037] <Main body> The main body 20 is bonded to the area around the article dispensing opening 3 on the upper surface 2a of the packaging body 2 via an adhesive layer 26 (see Figures 2(a) and (b)). The main body 20 is formed in a roughly oval shape in plan view, being relatively longer in the X direction and relatively shorter in the Y direction. The main body 20 has a base portion 23 including an inner circumferential base portion 21 and an outer circumferential base portion 22, and a support portion 24.

[0038] The inner circumferential base portion 21 is formed in the shape of an annular plate having an opening 25. The opening 25 is formed in a rounded rectangular shape (oval shape) in plan view, formed by combining two parallel lines of equal length extending in the X direction and two semicircles continuous at both ends of these parallel lines, and is set to a size that can surround the article dispensing opening 3 and the seal body 4 that is attached before use.

[0039] The outer peripheral base portion 22 is formed in a roughly C-shaped plate form, partially interrupted in the region where the tongue-shaped piece 51, described later, is provided, while maintaining a predetermined distance from the inner peripheral base portion 21 on the outside of the inner peripheral base portion 21.

[0040] Figure 2(a) is a schematic diagram showing the main part of the cross-section as seen by arrow AA in Figure 1(a). Note that in Figure 2(a), the article M and the sealing body 4 are omitted from the illustration (the same applies to Figures 2(b), 4(a) and (b), 10(a) and (b), 12(a) and (b), and 20(a) and (b)). As shown in Figure 2(a), the support portion 24 is formed in the shape of an inverted trapezoidal dish in cross-section. The support portion 24 is interposed between the inner circumferential base portion 21 and the outer circumferential base portion 22 so as to support both the inner circumferential base portion 21 and the outer circumferential base portion 22 in a state where they are separated from the upper surface portion 2a of the packaging body 2, in other words, floating, in a third direction (vertical direction: Z direction) that is perpendicular to both the first direction (X direction) and the second direction (Y direction). An adhesive layer 26 is interposed between the support portion 24 and the upper surface portion 2a of the packaging body 2. In this way, the inner circumferential base portion 21 is supported by the support portion 24 so that it is spaced apart from the packaging body 2 and floating. Therefore, even if the amount of indentation of the cover portion 31 (protruding portion 34), which will be described later, that abuts the inner circumferential edge of the opening 25 of the inner circumferential base portion 21 increases slightly, it is possible to prevent it from interfering with the packaging body 2. In this example, the Z-direction position of the inner circumferential base portion 21 and the Z-direction position of the outer circumferential base portion 22 are set to be the same with respect to the upper surface portion 2a of the packaging body 2. In other words, the inner circumferential base portion 21 and the outer circumferential base portion 22 are arranged to be flush with the upper surface portion 2a of the packaging body 2 in the Z-direction (vertical direction).

[0041] <Lid> As shown in Figures 1(a) and (b), the lid 30 has a cover portion 31. The cover portion 31 includes an engagement portion 32 and a peripheral portion 33. The engagement portion 32 engages with the opening 25 when the lid 30 is closed relative to the main body 20. The peripheral portion 33 is integrally formed to the engagement portion 32 so as to cover the peripheral portion (base portion 23, support portion 24) of the opening 25 of the main body 20 when the lid is closed.

[0042] Figure 2(b) shows the state in which the lid 30 is closed relative to the main body 20 as in Figure 2(a). As shown in Figure 2(b), the engaging portion 32 has a protruding portion 34 formed to protrude relatively from the peripheral portion 33 toward the closing direction of the lid 30, and a recessed portion 35 formed to be inseparable from the peripheral portion 33 toward the closing direction of the lid 30, so as to be inseparable from the protruding portion 34. In the closed lid state as shown in Figure 2(b), the protruding portion 34 has a tapered surface 34a that narrows toward the closing direction of the lid 30 so as to abut the inner peripheral edge of the opening 25 in line contact, as shown in the partially enlarged view in Figure 2(b). By adopting a configuration having such a tapered surface 34a, even if the paper lid material 10A expands or contracts due to moisture absorption / release caused by changes in humidity, for example, the amount of pressure applied by the cover portion 31 having the tapered surface 34a to the opening 25 provided in the base portion 23 of the main body 20 can be changed to ensure that the tapered surface 34a reliably contacts the inner periphery of the opening 25 in line contact. Therefore, the reliability of the sealing performance during actual use, which involves changes in humidity, can be improved.

[0043] <Hinge> As shown in Figure 1(a), the hinge 40 is formed on one side of the main body 20 in the Y direction, at the portion connecting the main body 20 and the lid 30, by processing along the X direction, for example, by creating perforations, fold lines (groove-shaped recesses), or half-cuts. This makes it possible to open or close the lid by rotating the lid 30 around the hinge 40 as a pivot point.

[0044] <Latching means> As shown in Figure 1(b), the paper lid material 10A further comprises a locking means 50 for maintaining a closed state. The locking means 50 includes a tongue-shaped piece 51 and a pair of locking claw pieces 52.

[0045] Figure 3 is a plan view of the unfolded state of the paper lid material 10A of the first embodiment. As shown in Figure 3, the tongue-shaped piece 51 is positioned spaced apart from the hinge 40 in the Y direction and is integrally connected to the outer peripheral base portion 22 so as to extend from an intermediate position in the X direction on the outer peripheral base portion 22 of the main body 20 toward the other side in the Y direction (downward side in Figure 3). In addition, a pair of locking claw pieces 52 are integrally connected to the peripheral portion 33 of the cover portion 31 so as to be able to engage with both ends of the tongue-shaped piece 51 in the X direction when the lid is closed.

[0046] Figure 4 is an explanatory diagram of the closing operation of the lid 30 relative to the main body 20. In the paper lid material 10A of the first embodiment configured as described above, when the lid 30 is rotated in the closing direction relative to the main body 20 with the hinge 40 as the pivot point, as shown in Figure 4(a), the inner edge of the opening 25 of the inner circumference base portion 21 on the side closer to the hinge 40 and the tapered surface 34a of the protruding portion 34 in the cover portion 31 come into partial contact. Furthermore, as shown in Figure 4(b), when the lid 30 is rotated in the closing direction, the area in which the inner edge of the opening 25 and the tapered surface 34a of the protruding portion 34 come into partial contact expands along the Y direction from one side (right side in Figure 4(b)) where the hinge 40 is provided to the other side (left side in Figure 4(b)). Then, as shown in Figure 2(b), when the lid 30 is rotated until it is completely closed to the main body 20, the inner periphery of the opening 25 and the tapered surface 34a of the protruding portion 34 come into line contact, resulting in a closed lid state. In this closed lid state, the opening 25 is covered by the cover portion 31, and the tapered surface 34a of the protruding portion 34 on the cover portion 31 comes into line contact with the inner periphery of the opening 25. Thus, with a simple structure in which the lid 30 is provided with a cover portion 31 that covers the opening 25 and comes into contact with the inner periphery of the opening 25 in the closed lid state, a sealed state can be easily achieved simply by closing the lid 30 to the main body 20.

[0047] The operation of the locking means 50 for maintaining the closed lid state described above will be explained with reference to Figure 5. Figure 5 is an explanatory diagram of the operation of the locking means 50 applied to the paper lid material 10A of the first embodiment. Figure 5(a) is a diagram of the state before locking. Figure 5(b) is a diagram of the state after locking. As shown in Figures 5(a) to (b), a finger (not shown) is placed on the tongue-shaped piece 51 and the tongue-shaped piece 51 is pulled up in the direction away from the packaging body 2 (upward). As a result, the tongue-shaped piece 51 comes into contact with the pair of locking claw pieces 52, and both the pair of locking claw pieces 52 and the tongue-shaped piece 51 elastically deform according to the amount of operation of the tongue-shaped piece 51. When a certain amount of operation is exceeded, the tongue-shaped piece 51 is released from its grip on the pair of locking claw pieces 52, and the pair of locking claw pieces 52 return to their original shape. Afterward, when the finger is removed from the tongue-shaped piece 51, the tongue-shaped piece 51 returns to its original shape, and the pair of locking claw pieces 52 and the tongue-shaped piece 51 engage, creating a locked state. In this way, the closed state is maintained, preventing the lid 30 from opening unintentionally relative to the main body 20.

[0048] To release the locking state shown in Figure 5(b), a finger (not shown) is placed on the tongue-shaped piece 51 and it is operated to push the tongue-shaped piece 51 downwards towards the packaging body 2. As a result, the tongue-shaped piece 51 comes into contact with the pair of locking claw pieces 52, and both the pair of locking claw pieces 52 and the tongue-shaped piece 51 elastically deform according to the amount of movement of the tongue-shaped piece 51. When a certain amount of movement is exceeded, the tongue-shaped piece 51 disengages from the pair of locking claw pieces 52, and the engagement between the pair of locking claw pieces 52 and the tongue-shaped piece 51 is released, resulting in a released locking state. In this way, the locking state can be easily released, and the lid 30 can be opened relative to the main body 20.

[0049] In the paper lid material 10A, the tongue-shaped piece 51 extends from the base portion 23 (outer peripheral base portion 22) at a position spaced apart from the hinge 40, making it easier to grip the tongue-shaped piece 51 from the opposite side of the hinge 40 when performing the actions of locking and releasing the locking state. Furthermore, since the base portion 23 (outer peripheral base portion 22) is supported by the support portion 24 so that it is spaced apart (floating) from the packaging body 2, the tongue-shaped piece 51 is also spaced apart (floating) from the packaging body 2, which also makes it easier to grip the tongue-shaped piece 51. Therefore, the tongue-shaped piece 51 can be easily engaged with / disengaged from the pair of locking claw pieces 52.

[0050] The packaging container 1A, equipped with a paper lid 10A as described above, has a simple structure that allows for easy sealing, and the sealing can be maintained by the locking means 50. Therefore, drying and deterioration of the articles (such as wet wipes) M stored in the packaging 2 can be reliably suppressed. Furthermore, by opening the paper lid 10A, the articles M can be easily removed from the packaging container 1A through the article dispensing opening 3 and the opening 25.

[0051] [Second Embodiment] Figure 6 is an overall perspective view of a packaging container 1B equipped with a paper lid material 10B according to the second embodiment of the present invention. Figure 6(a) shows the lid 30 in an open state, with the lid 30 open to the body 20 by approximately 120°. Figure 6(b) shows the lid 30 in a closed state, with the lid 30 closed to the body 20 and locked by the locking means 60. The paper lid material 10B of the second embodiment shown in Figure 6 differs from the paper lid material 10A of the first embodiment shown in Figure 1 in the structure of the locking means for maintaining the closed state, but the other configurations are basically the same as those of the paper lid material 10A of the first embodiment. Therefore, the paper lid material 10B of the second embodiment can also obtain basically the same effects as the paper lid material 10A of the first embodiment. In the paper lid material 10B of the second embodiment, parts that are the same as or similar to those of the paper lid material 10A of the first embodiment are denoted by the same reference numerals in the figures, and detailed explanations are omitted. Hereafter, the explanation will focus on parts specific to the paper lid material 10B of the second embodiment.

[0052] <Latching means> In the paper lid material 10B shown in Figure 6(b), the locking means 60 for maintaining the closed lid includes a tongue-shaped piece 61 and a pair of locking claw pieces 62.

[0053] Figure 7 is a plan view of the unfolded state of the paper lid material 10B of the second embodiment. As shown in Figure 7, the pair of locking claw pieces 62 are integrally connected to the outer peripheral base portion 22 of the main body 20 so as to extend from the outer peripheral base portion 22 toward the other side in the Y direction (downward in Figure 7) at a predetermined distance in the X direction. The tongue-shaped piece 61 is positioned at a distance from the hinge 40 in the Y direction and extends from the peripheral portion 33 of the cover portion 31 so as to be able to engage with the pair of locking claw pieces 62 when the lid is closed.

[0054] The tongue-shaped piece 61 has a plurality of mountain-shaped protrusions 63 that relatively project outwards on both sides in the X direction (left side in Figure 7 and right side in Figure 7) and a plurality of valley-shaped recesses 64 that are relatively recessed. The plurality of protrusions 63 and the plurality of recesses 64 are arranged alternately at a predetermined pitch in the Y direction. On the other hand, the pair of locking claw pieces 62 have a plurality of recesses 65 and a plurality of protrusions 66 that, in a plan view, match the shape of the plurality of protrusions 63 and the plurality of recesses 64 provided on the tongue-shaped piece 61 when the lid is closed. Note that the shape of the protrusions 63 and 66 is not limited to the mountain-shaped shape exemplified here, but may be, for example, semicircular, rectangular, or irregularly shaped (for example, symbols such as clubs and spades on playing cards).

[0055] In the paper lid material 10B of the second embodiment, which is configured as described above, the operation of closing the lid 30 to the main body 20 to create a sealed state is basically the same as that of the paper lid material 10A of the first embodiment, so its explanation will be omitted.

[0056] The operation of the locking means 60 for maintaining the closed state in the paper lid material 10B of the second embodiment will be explained with reference to Figure 8. Figure 8 is an explanatory diagram of the operation of the locking means 60 applied to the paper lid material 10B of the second embodiment. Figure 8(a) is a diagram of the temporary locking state between the tongue-shaped piece 61 and the pair of locking claw pieces 62. Figure 8(b) is a diagram of the permanent locking state. Before the tongue-shaped piece 61 and the pair of locking claw pieces 62 are fitted together, if a finger (not shown) is placed on the tongue-shaped piece 61 and the tongue-shaped piece 61 is pushed down in the direction toward the packaging body 2 (downward in Figure 8(a)), in other words, if the tongue-shaped piece 61 is pushed toward the pair of locking claw pieces 62 in a plan view direction, as shown in Figure 8(a), the multiple protrusions 63 and multiple recesses 64 provided on the tongue-shaped piece 61 and the multiple recesses 65 and multiple protrusions 66 provided on the pair of locking claw pieces 62 are fitted together sequentially from the tip side of the tongue-shaped piece 61 (pair of locking claw pieces 62) toward the base side of the tongue-shaped piece 61 (pair of locking claw pieces 62). As a result, the tongue-shaped piece 61 can be temporarily locked toward the pair of locking claw pieces 62 by a frictional engagement force corresponding to the number of protrusions and recesses that fit together on the tongue-shaped piece 61 and the pair of locking claw pieces 62, the fitting depth, the coefficient of friction, etc. Furthermore, when the tongue-shaped piece 61 is pushed against the pair of locking claw pieces 62 in a plan view direction from a temporary locking state, the bending of the tongue-shaped piece 61 causes the phases of the protrusions 63 and recesses 64 on the tongue-shaped piece 61 to shift in a direction perpendicular to the plan view direction, i.e., horizontally, relative to the recesses 65 and protrusions 66 on the pair of locking claw pieces 62. As a result, as shown in Figure 8(b), the protrusions 63 and 66 on the tongue-shaped piece 61 and the pair of locking claw pieces 62 partially overlap in a plan view. This causes the protrusions 63 and 66 on the tongue-shaped piece 61 and the pair of locking claw pieces 62 to hook onto each other, allowing the tongue-shaped piece 61 to be locked more firmly to the pair of locking claw pieces 62.

[0057] To release the locking state shown in Figure 8(b), a finger (not shown) is placed on the tongue-shaped piece 61 and the tongue-shaped piece 61 is pulled upward in a direction away from the packaging body 2 (upward in Figure 8). As a result, both the pair of locking claw pieces 62 and the tongue-shaped piece 61 elastically deform according to the amount of movement of the tongue-shaped piece 61. When a certain amount of movement is exceeded, the tongue-shaped piece 61 disengages from the pair of locking claw pieces 62, and the engagement between the pair of locking claw pieces 62 and the tongue-shaped piece 61 is released, resulting in a released locking state. In this way, the locking state can be easily released, and the lid 30 can be opened relative to the main body 20.

[0058] [Third Embodiment] Figure 9 is an overall perspective view of a packaging container 1C equipped with a paper lid material 10C according to the third embodiment of the present invention. Figure 9(a) shows the lid 80 in an open state, with the lid 80 open to approximately 120° relative to the body 70. Figure 9(b) shows the lid 80 in a closed state, with the lid 80 closed to the body 70 and locked by the locking means 100. As shown in Figures 9(a) and (b), the paper lid material 10C comprises a body 70, a lid 80, and a hinge 90. The body 70 and the lid 80 are connected via the hinge 90, and the lid 80 can be rotated around the hinge 90 to achieve the open state shown in Figure 9(a) and the closed state shown in Figure 9(b). Although Figure 9(a) shows the lid 80 open to approximately 120° relative to the body 70, in reality, the lid 80 can be opened to approximately 180° relative to the body 70.

[0059] <Main body> The main body 70 is bonded to the area around the article dispensing opening 3 on the upper surface 2a of the packaging body 2 via an adhesive layer 76 (see Figure 10). The main body 70 is formed in a horizontally elongated shape in plan view, that is, relatively longer in the X direction and relatively shorter in the Y direction, and is roughly a rounded rectangle in plan view. The main body 70 has a base portion 73 including an inner circumferential base portion 71 and an outer circumferential base portion 72, and a support portion 74.

[0060] The inner circumferential base portion 71 is formed in the shape of an annular plate having an opening 75. The opening 75 is formed in an elliptical shape in plan view, with its major axis in the X direction and its minor axis in the Y direction, and is set to be large enough to surround the article dispensing opening 3 and the seal body 4 that is attached before use.

[0061] The outer peripheral base portion 72 is formed in a horizontally elongated, roughly C-shaped plate shape, partially cut out in the area between the pair of locking claw pieces 102, which will be described later, so as to form the outline of the main body 70 outside the inner peripheral base portion 71.

[0062] Figure 10(a) is a schematic diagram showing the main part of the cross-section in the direction of arrow BB in Figure 9(a). As shown in Figure 10(a), the support portion 74 is formed in the shape of an inverted trapezoidal dish in cross-section. The support portion 74 is interposed between the inner circumferential base portion 71 and the outer circumferential base portion 72 so as to support both the inner circumferential base portion 71 and the outer circumferential base portion 72 in a state where they are separated from the upper surface portion 2a of the packaging body 2, in other words, floating, in a third direction (vertical direction: Z direction) that is perpendicular to both the first direction (X direction) and the second direction (Y direction). An adhesive layer 76 is interposed between the support portion 74 and the upper surface portion 2a of the packaging body 2. In this way, the inner circumferential base portion 71 is supported by the support portion 74 so that it is spaced apart from the packaging body 2 and floating. Therefore, even if the amount of indentation of the cover portion 81 (protruding portion 84), which will be described later, that abuts the inner circumferential edge of the opening 75 of the inner circumferential base portion 71 increases slightly, it is possible to prevent it from interfering with the packaging body 2. In this example, the Z-direction position of the inner circumferential base portion 71 and the Z-direction position of the outer circumferential base portion 72 are set to be the same with respect to the upper surface portion 2a of the packaging body 2. In other words, the inner circumferential base portion 71 and the outer circumferential base portion 72 are arranged to be flush with the upper surface portion 2a of the packaging body 2 in the Z-direction (vertical direction).

[0063] <Lid> As shown in Figures 9(a) and (b), the lid 80 has a cover portion 81. The cover portion 81 includes an engagement portion 82 and a peripheral portion 83. The engagement portion 82 engages with the opening 75 when the lid 80 is closed relative to the main body 70. The peripheral portion 83 is integrally formed to the engagement portion 82 so as to cover the peripheral portion (base portion 73, support portion 74) of the opening 75 of the main body 70 when the lid is closed. The peripheral portion 83 includes a canopy piece 83a formed in a skirt shape so as to cover the area between the support portion 74 and the packaging body 2 when viewed from the side when the lid is closed. By providing such a canopy piece 83a, for example, when a hand hits the paper lid material 10C from the side when the lid is closed, the impact force acting on the adhesive layer 76 between the support portion 74 and the packaging body 2 is mitigated, and damage to the packaging container 1C can be prevented.

[0064] Figure 10(b) shows the state in which the lid 80 is closed relative to the main body 70 as in Figure 10(a). As shown in Figure 10(b), the engaging portion 82 has an annular protruding portion 84 formed to protrude relatively from the peripheral portion 83 toward the closing direction of the lid 80, and an annular recessed portion 85 formed to be inseparable from the peripheral portion 83 toward the closing direction of the lid 80, so as to be inseparable from the protruding portion 84. As shown in the partially enlarged view in Figure 10(b), the protruding portion 84 has a tapered surface 84a that narrows toward the closing direction of the lid 80 so as to abut the inner peripheral edge of the opening 75 in line contact. By adopting a configuration having such a tapered surface 84a, even if the paper lid material 10C expands or contracts due to moisture absorption / release caused by changes in humidity, for example, the amount of pressure applied by the cover portion 81 having the tapered surface 84a to the opening 75 provided in the base portion 73 of the main body 70 can be changed to ensure that the tapered surface 84a reliably contacts the inner periphery of the opening 75 in line contact. Therefore, the reliability of the sealing performance during actual use, which involves changes in humidity, can be improved.

[0065] As shown in Figure 10(b), the engaging portion 82 of the cover portion 81 of the lid 80 further has a concave surface 86 formed by recessing the portion facing the article outlet 3 in the opening direction of the lid 80 when the lid is closed. By adopting this configuration, a space S is secured between the concave surface 86 of the cover portion 81 and the article outlet 3 when the lid is closed, for storing the portion of the article that protrudes from the article outlet 3. This prevents problems such as the lid 80 not closing completely due to interference with the portion of the article protruding from the article outlet 3.

[0066] <Hinge> As shown in Figure 9(a), the hinge 90 is formed on one side of the main body 70 in the longitudinal direction (X direction) where the main body 70 and the lid 80 are connected, by processing such as perforations, creases (groove-shaped recesses), or half-cuts along the Y direction, which is the short direction of the main body 70. As a result, the lid can be opened or closed by rotating the lid 80 around the hinge 90. In this example, the hinge 90 is shown on one side of the main body 70 in the longitudinal direction, but it is not limited to this, and the hinge 90 may also be provided on one side of the main body 70 in the short direction.

[0067] <Latching means> As shown in Figure 9(b), the paper lid material 10C further comprises a locking means 100 for maintaining a closed lid state. The locking means 100 includes a tongue-shaped piece 101 and a pair of locking claw pieces 102.

[0068] Figure 11 is a plan view of the unfolded state of the paper lid material 10C of the third embodiment. As shown in Figure 11, the pair of locking claw pieces 102 are integrally connected to the outer peripheral base portion 72 of the main body 70 so as to extend from the outer peripheral base portion 72 toward the other side in the X direction (downward in Figure 11) at a predetermined distance in the Y direction. The tongue-shaped piece 101 is positioned spaced apart from the hinge 90 in the X direction and extends from the peripheral portion 83 of the cover portion 81 so as to be able to engage with the pair of locking claw pieces 102 when the lid is closed.

[0069] The tongue-shaped piece 101 has a plurality of mountain-shaped protrusions 103 that relatively project outwards on both sides in the Y direction (left side in Figure 11) and the other side (right side in Figure 11), and a plurality of valley-shaped recesses 104 that are relatively recessed. The plurality of protrusions 103 and the plurality of recesses 104 are arranged alternately at a predetermined pitch in the X direction. On the other hand, the pair of locking claw pieces 102 have a plurality of recesses 105 and a plurality of protrusions 106 that, in a plan view, match the shape of the plurality of protrusions 103 and the plurality of recesses 104 provided on the tongue-shaped piece 101 when the lid is closed. Note that the shape of the protrusions 103 and 106 is not limited to a mountain shape, as described in the description of the second embodiment.

[0070] Figure 12 is an explanatory diagram of the closing operation of the lid 80 relative to the main body 70. In the paper lid material 10C of the third embodiment configured as described above, when the lid 80 is rotated in the closing direction relative to the main body 70 with the hinge 90 as the pivot point, the inner peripheral edge of the opening 75 of the base portion 73 on the side closer to the hinge 90 and the cover portion 81 come into partial contact, as shown in Figure 12(a). Furthermore, as shown in Figure 12(b), when the lid 80 is rotated in the closing direction, the area in which the inner peripheral edge of the opening 75 of the base portion 73 and the cover portion 81 come into partial contact expands along the longitudinal direction of the main body from one side (left side in Figure 12(b)) where the hinge 90 is provided to the other side (right side in Figure 12(b)). Then, as shown in Figure 10(b), when the lid 80 is rotated until it is completely closed to the main body 70, the inner edge of the opening 75 and the tapered surface 84a of the protruding portion 84 come into contact with each other in a line contact, and the lid 80 is sealed to the main body 70. In this way, the area in which the inner edge of the opening 75 and the tapered surface 84a of the protruding portion 84 come into partial contact is gradually widened along the longitudinal direction of the main body 70, until finally the inner edge of the opening 75 and the tapered surface 84a of the protruding portion 84 come into contact with each other in a whole. Combined with the centering action of the tapered surface 84a acting between the inner edge of the opening 75 and the protruding portion 84 in the short direction of the main body 70, the operation of closing the lid 80 to the main body 70 to create a sealed state can be performed smoothly and reliably. Thus, with a simple structure in which a cover portion 81 is provided on the lid 80 that covers the opening 75 when the lid is closed and abuts against the inner peripheral edge of the opening 75, a sealed state can be easily achieved by simply closing the lid 80 on the main body 70.

[0071] The operation of the locking means 100 for maintaining the closed lid state described above will be explained with reference to Figure 13. Figure 13 is an explanatory diagram of the operation of the locking means 100 applied to the paper lid material 10C of the third embodiment. Figure 13(a) is a diagram of the temporary locking state between the tongue-shaped piece 101 and the pair of locking claw pieces 102. Figure 13(b) is a diagram of the permanent locking state. When the tongue-shaped piece 101 and the pair of locking claw pieces 102 are in a state before temporary locking, if you place your finger (not shown) on the tongue-shaped piece 101 and operate it in a direction that brings it closer to the packaging body 2 (downward in Figure 13), in other words, if you push the tongue-shaped piece 101 against the pair of locking claw pieces 102 in a plan view direction, as shown in Figure 13(a), the multiple protrusions 103 and multiple recesses 104 provided on the tongue-shaped piece 101 and the multiple recesses 105 and multiple protrusions 106 provided on the pair of locking claw pieces 102 will fit together sequentially from the tip side of the tongue-shaped piece 101 (pair of locking claw pieces 102) toward the base side of the tongue-shaped piece 101 (pair of locking claw pieces 102). As a result, the tongue-shaped piece 101 can be temporarily locked to the pair of locking claw pieces 102 by a frictional engagement force corresponding to the number of interlocking protrusions and recesses, interlocking depth, and coefficient of friction between the tongue-shaped piece 101 and the pair of locking claw pieces 102. Furthermore, when the tongue-shaped piece 101 is pushed in along the planar direction against the pair of locking claw pieces 102, the bending of the tongue-shaped piece 101 causes the phases of the protrusions 103 and recesses 104 on the tongue-shaped piece 101 to shift in a direction perpendicular to the planar direction, i.e., horizontally, relative to the recesses 105 and protrusions 106 on the pair of locking claw pieces 102. Therefore, as shown in Figure 13(b), the protrusions 103 and 106 on the tongue-shaped piece 101 and the pair of locking claw pieces 102 partially overlap in planar view. As a result, the protrusions 103 and 106 of the tongue-shaped piece 101 and the pair of locking claw pieces 102 interlock with each other, allowing the tongue-shaped piece 101 to be more firmly locked to the pair of locking claw pieces 102. In this way, the closed state is maintained, preventing the lid 80 from unintentionally opening relative to the main body 70.

[0072] To release the locking state shown in Figure 13(b), a finger (not shown) is placed on the tongue-shaped piece 101 and the tongue-shaped piece 101 is pulled upward in a direction away from the packaging body 2 (upward in Figure 13). As a result, both the pair of locking claw pieces 102 and the tongue-shaped piece 101 elastically deform according to the amount of movement of the tongue-shaped piece 101. When a certain amount of movement is exceeded, the tongue-shaped piece 101 disengages from the pair of locking claw pieces 102, and the engagement between the pair of locking claw pieces 102 and the tongue-shaped piece 101 is released, resulting in a unlocked state. In this way, the locking state can be easily released, and the lid 80 can be opened relative to the main body 70.

[0073] The packaging container 1C, equipped with the paper lid 10C as described above, has a simple structure that allows for easy sealing, and the sealing can be maintained by a locking mechanism, thus reliably preventing the drying of the contents (such as wet wipes) stored in the packaging 2. Furthermore, by opening the paper lid 10C, the contents M can be easily removed from the packaging container 1C through the contents dispensing opening 3 and the opening 75.

[0074] [Fourth Embodiment] Figure 14 is an overall perspective view of a packaging container 1D equipped with a paper lid material 10D according to the fourth embodiment of the present invention. Figure 14(a) shows the lid 80 in an open state, with the lid 80 open to the body 70 by approximately 120°. Figure 14(b) shows the lid 80 in a closed state, with the lid 80 closed to the body 70 and locked by the locking means 110. The paper lid material 10D of the fourth embodiment shown in Figure 14 differs slightly in the shape of its contour from the paper lid material 10C of the third embodiment shown in Figure 9, and also differs in the structure of the locking means for maintaining the closed state. In other respects, it is basically the same as the paper lid material 10C of the third embodiment. Therefore, the paper lid material 10D of the fourth embodiment can also obtain basically the same effects as the paper lid material 10C of the third embodiment. In the fourth embodiment of the paper lid material 10D, parts that are the same as or similar to the paper lid material 10C of the third embodiment will be denoted by the same reference numerals in the figure, and their detailed description will be omitted. The following description will focus on parts specific to the paper lid material 10D of the fourth embodiment.

[0075] The main body 70 has a horizontally elongated shape in plan view, being relatively longer in the X direction and relatively shorter in the Y direction. The portion from one end in the X direction to the middle is rectangular, and the portion from the middle to the other end is semi-elliptical. When viewed upright with the rectangular portion at the bottom and the semi-elliptical portion at the top, it forms a bell shape. On the other hand, the lid 80 is similar in shape to the main body 70 but is slightly larger.

[0076] <Latching means> In the paper lid material 10D shown in Figure 14(b), the locking means 110 for maintaining the closed lid includes a tongue-shaped piece 111 and a pair of locking claw pieces 112.

[0077] <Latching means> Figure 15 is a plan view of the unfolded state of the paper lid material 10D of the fourth embodiment. As shown in Figure 15, the tongue-shaped piece 111 is integrally connected to the outer peripheral base portion 72 of the main body 70 so as to extend from an intermediate position in the Y direction on the outer peripheral base portion 72 toward the other side in the X direction (downward side in Figure 15). In addition, the pair of locking claw pieces 112 are integrally connected to the peripheral portion 83 of the cover portion 81 so as to be able to engage with both ends of the tongue-shaped piece 111 in the Y direction when the lid is closed. Furthermore, the tip ends of the pair of locking claw pieces 112 are connected by an outwardly convex arc-shaped piece 118.

[0078] The tongue-shaped piece 111 has a plurality of mountain-shaped protrusions 113 that relatively project outwards on both sides in the Y direction (left side in Figure 15) and the other side (right side in Figure 15), and a plurality of valley-shaped recesses 114 that are relatively recessed. The plurality of protrusions 113 and the plurality of recesses 114 are arranged alternately at a predetermined pitch in the X direction. On the other hand, the pair of locking claw pieces 112 have a plurality of recesses 115 and a plurality of protrusions 116 that, in a plan view, match the shape of the plurality of protrusions 113 and the plurality of recesses 114 provided on the tongue-shaped piece 111 when the lid is closed.

[0079] In the fourth embodiment of the paper lid material 10D configured as described above, the operation of closing the lid 80 to the main body 70 to create a sealed state is basically the same as that of the paper lid material 10C of the third embodiment, so its explanation will be omitted.

[0080] The operation of the locking means 110 for maintaining the closed state in the paper lid material 10D of the fourth embodiment will be explained with reference to Figure 16. Figure 16 is an explanatory diagram of the operation of the locking means 110 applied to the paper lid material 10D of the fourth embodiment. Figure 16(a) is a diagram of the temporary locking state between the tongue-shaped piece 111 and the pair of locking claw pieces 112. Figure 16(b) is a diagram of the permanent locking state. When the tongue-shaped piece 111 and the pair of locking claw pieces 112 are in a state before locking, if a finger (not shown) is placed on the tongue-shaped piece 111 and the tongue-shaped piece 111 is pushed upward in a direction away from the packaging body 2 (upward in Figure 16), in other words, if the tongue-shaped piece 111 is pushed upward in a plan view direction relative to the pair of locking claw pieces 112, as shown in Figure 16(a), the multiple protrusions 113 and multiple recesses 114 provided on the tongue-shaped piece 111 and the multiple recesses 115 and multiple protrusions 116 provided on the pair of locking claw pieces 112 are sequentially fitted together from the tip side of the tongue-shaped piece 111 (pair of locking claw pieces 112) toward the base side of the tongue-shaped piece 111 (pair of locking claw pieces 112). As a result, the tongue-shaped piece 111 can be temporarily locked to the pair of locking claw pieces 112 by a frictional engagement force corresponding to the number of interlocking protrusions and recesses, interlocking depth, and coefficient of friction between the tongue-shaped piece 111 and the pair of locking claw pieces 112. Furthermore, when the tongue-shaped piece 111 is pushed in along the planar direction against the pair of locking claw pieces 112, the bending of the tongue-shaped piece 111 causes the phases of the protrusions 113 and recesses 114 on the tongue-shaped piece 111 to shift in a direction perpendicular to the planar direction, i.e., horizontally, relative to the recesses 115 and protrusions 116 on the pair of locking claw pieces 112. Therefore, as shown in Figure 16(b), the protrusions 113 and 116 on the tongue-shaped piece 111 and the pair of locking claw pieces 112 partially overlap in planar view. As a result, the protrusions 113 and 116 of the tongue-shaped piece 111 and the pair of locking claw pieces 112 interlock with each other, allowing the tongue-shaped piece 111 to be more firmly locked to the pair of locking claw pieces 112. In this way, the closed state is maintained, preventing the lid 80 from unintentionally opening relative to the main body 70.

[0081] To release the locking state shown in Figure 16(b), a finger (e.g., thumb: not shown) is placed on the arc-shaped piece 118 connecting the tips of the pair of locking claw pieces 112, and the tongue-shaped piece 111 is pushed in with another finger (e.g., index finger: not shown). As a result, both the pair of locking claw pieces 112 and the tongue-shaped piece 111 elastically deform according to the amount of movement of the tongue-shaped piece 111. When a certain amount of movement is exceeded, the tongue-shaped piece 111 disengages from the pair of locking claw pieces 112, and the engagement between the pair of locking claw pieces 112 and the tongue-shaped piece 111 is released, resulting in a released locking state. In this way, the locking state can be easily released, and the lid 80 can be opened relative to the main body 70.

[0082] In the third embodiment, the paper lid material 10C requires two die-cutting steps because the die-cutting height position of the outline of the lid 80 and the die-cutting height position of the tongue-shaped piece 101 are different in the die-cutting process described later. In contrast, the fourth embodiment, the paper lid material 10D, has the advantage that the die-cutting process can be completed in a single step because the die-cutting height position of the outline of the main body 70 and the die-cutting height position of the tongue-shaped piece 111 are the same.

[0083] <Manufacturing method for paper lid materials> Figure 17 is an explanatory diagram of a method for manufacturing a paper lid material 10A using a press molding apparatus 200. Below, the method for manufacturing the paper lid material 10A of the first embodiment will be described as a representative example. Note that the paper lid materials 10B to 10D of the second to fourth embodiments can also be manufactured using basically the same manufacturing method as the paper lid material 10A of the first embodiment.

[0084] The press forming apparatus 200 shown in Figure 17 mainly consists of a roll feed 201, a forming die 202, and a punching die 203. The roll feed 201 is equipped with a feed roller 204 and a winding roller 205 arranged at a predetermined inter-axis distance. A roll of paper 206, which is a strip of cardboard (workpiece) W wound into a roll, is mounted on the feed roller 204. In the roll feed 201, the workpiece W that is fed out from the roll of paper 206 by the feed roller 204 is wound up by the winding roller 205. The forming die 202 and the punching die 203 are arranged sequentially in the workpiece feeding direction of the roll feed 201. The forming die 202, which is located upstream in the workpiece feeding direction, is configured to perform a predetermined forming process on the workpiece W. The punching die 203, which is located downstream in the workpiece feeding direction, is configured to perform a predetermined punching process on the workpiece W after the forming process has been completed.

[0085] <Roll feeding process> With a predetermined tension applied to the workpiece W between the feed roller 204 and the winding roller 205, the workpiece W is unfurled from the roll paper 206 by the feed roller 204 while the workpiece W is simultaneously wound up by the winding roller 205. In this way, the workpiece W is fed in the workpiece feeding direction and supplied to the respective processing stages of the molding die 202 and the punching die 203.

[0086] <Molding process> In the molding die 202, a predetermined molding process is performed on the workpiece W supplied to the processing stage of the molding die 202, thereby forming the support portion 24 and the engagement portion 32, which have a relatively uneven shape, in the paper lid material 10A, which is the product.

[0087] <Die-cutting process> In the die-cutting die 203, a predetermined die-cutting process is performed on the molded workpiece W supplied to the processing stage of the die-cutting die 203. This process cuts the contour OL and the opening 25 of the paper lid material 10A, which is the product, and simultaneously forms the hinge 40 by adding perforations, creases, or half-cuts to the portion that will become the hinge 40.

[0088] In the manufacturing method of the paper lid material 10A using the press molding apparatus 200 described above, the workpiece W can be held when molding is performed by the molding die 202 and when punching is performed by the punching die 203 by applying a predetermined tension to the workpiece W between the feed roller 204 and the winding roller 205. For this reason, there is no need for a special mechanism in the molding die 202 and the punching die 203 to press and hold the workpiece W around the part to be processed, and the structure of the molding die 202 and the punching die 203 can be simplified.

[0089] Although the paper lid material of the present invention and the packaging container equipped with the paper lid material have been described above based on several embodiments, the present invention is not limited to the configurations described in the above embodiments, and its configuration can be modified as appropriate without departing from the spirit of the invention. Therefore, another embodiment that modifies the above embodiments will be described below.

[0090] (Another Embodiment 1) Figure 18 is an overall perspective view of a packaging container 1E equipped with a paper lid 10E according to another embodiment. Figure 18(a) shows the lid 30 in an open state, with the lid 30 open to approximately 120° relative to the body 20. Figure 18(b) shows the lid 30 in a closed state, with the lid 30 closed relative to the body 20 and locked by the locking means 50. The paper lid 10E according to another embodiment 1 relates to a modification of the paper lid 10E of the first embodiment. In the first embodiment, an example was shown in which the body 20 is formed in a substantially oval shape in plan view, and the lid 30 is also formed in a substantially oval shape in plan view accordingly, but it is not limited to this. As shown in Figures 18(a) and (b), the body 20 may be formed in a rounded rectangular shape in plan view, and the lid 30 may also be formed in a rounded rectangular shape in plan view accordingly.

[0091] (Another Embodiment 2) Figure 19 is an explanatory diagram of another configuration of the installation of the main body 20 on the packaging body 2. In the first embodiment, the paper lid material 10A is shown as an example in which the base portion 23 (inner circumferential base portion 21 and outer circumferential base portion 22) is installed on the upper surface 2a of the packaging body 2 via the support portion 24, but the invention is not limited to this. For example, as shown in Figure 19(a), the inner circumferential base portion 21 may be supported by the support portion 24 in a state where it is spaced apart from the upper surface 2a of the packaging body 2 (floating), while the outer circumferential base portion 22 may be installed in direct contact with the upper surface 2a of the packaging body 2. Also, as shown in Figure 19(b), there is an embodiment in which the base portion 23 is installed in direct contact with the upper surface 2a of the packaging body 2 without providing the support portion 24 (the same applies to the second to fourth embodiments).

[0092] (Another embodiment 3) Figure 20 is an explanatory diagram of another form of the hinge. In the first embodiment, the paper lid material 10A is shown as having one hinge 40 formed by processing such as perforations at the connection point between the main body 20 and the lid 30, but it is not limited to this. For example, as shown in Figure 20(a), multiple hinges 40 formed by processing such as perforations may be provided at the connection point between the main body 20 and the lid 30 (two in this example) (the same applies to the second to fourth embodiments). By adopting such a configuration, the protruding portion 34 can be pushed straight into the opening 25, and the inner periphery of the opening 25 and the tapered surface 34a of the protruding portion 34 can be brought into contact more smoothly and reliably.

[0093] (Another Embodiment 4) In the third embodiment of the paper lid material 10C, the body 70 and the lid 80 are shown to be assembled by integral molding, but the invention is not limited to this. As shown in Figure 20(b), the lid 80 having a hinge 90 formed by processing such as perforations and the body 70 may be molded separately, and then the body 70 and the lid 80 may be joined together via an adhesive layer 300 (the same applies to the first, second, and fourth embodiments).

[0094] (Another embodiment 5) Figure 21 is an explanatory diagram of another embodiment of the locking means. Instead of the locking means 50 in the paper lid material 10A of the first embodiment, the locking means 310 shown in Figure 21(a) and the locking means 320 shown in Figure 21(b) may be used. In the locking means 310 shown in Figure 21(a), the lid is kept closed by the engagement of a locking claw piece 311 provided on the main body 20 and a locking claw piece 312 provided on the lid 30. On the other hand, in the locking means 320 shown in Figure 21(b), the lid is kept closed by engaging a locking piece 323, which is formed by making a convex curved notch 322 toward the center of the lid 30 near the base of a tongue-shaped piece 321 provided on the lid 30, with the outer circumference of the main body 20.

[0095] (Another embodiment 6) Figure 22 is an explanatory diagram of another embodiment of adhesion between the main body 20 and the packaging body 2. In the paper lid material 10A of the first embodiment, the portion of the support part 24 facing the packaging body 2 is formed in a flat shape, and an adhesive layer 26 is provided between the flat portion of the support part 24 and the upper surface 2a of the packaging body 2, but the embodiment is not limited to this. As shown in Figure 22, the portion of the support part 24 facing the packaging body 2 may be formed in an uneven shape, and an adhesive layer 26 may be provided between the uneven portion of the support part 24 and the upper surface 2a of the packaging body 2 (the same applies to the second to fourth embodiments). By adopting such a configuration, when the support part 24 and the upper surface 2a of the packaging body 2 are bonded with adhesive, the adhesive can be made to penetrate the uneven portion of the support part 24 and prevent it from overflowing to the outside, thereby more reliably forming the adhesive layer 26.

[0096] (Another embodiment 7) Figure 23 is an explanatory diagram of the positioning means for the tongue-shaped piece 101. In the paper lid material 10C of the third embodiment, positioning means as shown in Figures 23(a) and (b) may be provided so that the position of the tongue-shaped piece 101 is determined relative to the pair of locking claw pieces 102 when the lid 80 is closed relative to the main body 70. The positioning means shown in Figure 23(a) is configured by providing a positioning projection 331 on the tongue-shaped piece 101 that fits between the pair of locking claw pieces 102 when the lid 80 is closed relative to the main body 70. The positioning means shown in Figure 23(b) is configured by providing a positioning projection 332 on the lid 80 that fits into the recessed portion 102a of the pair of locking claw pieces 102 when the lid 80 is closed relative to the main body 70.

[0097] (Another embodiment 8) Figure 24 is an explanatory diagram of an embodiment in which a weakening portion is provided on the tongue-shaped piece 101. In order to facilitate the engagement / disengagement operation with respect to the pair of locking claw pieces 102, weakening portions 341 and 342 may be provided on the tongue-shaped piece 101, as shown in Figure 24, formed by processing such as perforations, fold lines (groove-shaped recesses), or half-cuts. For example, by providing a weakening portion 341 along the Y direction at the base of the tongue-shaped piece 101, the entire tongue-shaped piece 101 can be easily bent with its base as the pivot point. Also, by providing a weakening portion 342 along the X direction at an intermediate position in the Y direction of the tongue-shaped piece 101, both ends of the tongue-shaped piece 101 in the Y direction can be easily bent.

[0098] In each of the above embodiments, the packaging body 2 may be constructed mainly of paper, similar to the paper lid materials 10A to 10D.

[0099] In each of the above embodiments, the main body 20, 70 and the lids 30, 80 may be subjected to decorative processes such as printing, hot stamping, embossing, or debossing, or the lids 30, 80 may be subjected to anti-slip processing to assist in opening.

[0100] In the first embodiment described above, an example was shown in which a paper lid material 10A is manufactured by press molding using a press molding apparatus 200. However, the invention is not limited to this, and the material may be molded by methods such as pressure molding or vacuum molding (the same applies to the second to fourth embodiments).

[0101] In each of the above embodiments, for example, a portion of the lid 30, 80 may be extended, the tip of this extended portion may be joined to the packaging body 2 by a joining means such as hot melt, and a weakened portion may be formed in the middle of the extended portion by processing such as perforations as described above, so that the weakened portion must be cut in order to open the lid 30, 80, thereby providing a function that indicates when the lid 30, 80 has been opened (a so-called tamper evident).

[0102] The above-mentioned locking means 50, 60, 100, 110, 310, and 320 are also applicable to general lid materials other than the above-mentioned paper lid materials 10A to 10D. That is, a lid material can be attached to a packaging body to cover an item dispensing opening provided in the packaging body for storing items, and can be comprising a main body having an opening corresponding to the item dispensing opening, a lid connected to the main body via a hinge so as to be openable and closable, and locking means 50, 60, 100, 110, 310, and 320 for maintaining the lid in a closed state relative to the main body.

[0103] (Another embodiment 9) Figure 25 is an explanatory diagram of an embodiment in which a rib 87 is provided on the lid 80. Here, an embodiment in which a rib 87 is provided on the lid 80 of the paper lid material 10D of the fourth embodiment will be described. Figure 25(a) is a plan view of the paper lid material 10D in an unfolded state. Figure 25(b) is a cross-section taken along the CC arrow in Figure 25(a). As shown in Figure 25(a), a rib 87 with a bell-shaped outer contour and an elliptical inner contour is formed in the peripheral portion 83 between the engagement portion 82 and the outer peripheral portion (overhang piece 83a) of the cover portion 81 of the lid 80, surrounding the engagement portion 82. As shown in Figure 25(b), the rib 87 has an annular protruding portion 87a formed to protrude relatively from the peripheral portion 83 toward the closing direction of the lid 80, and an annular recessed portion 87b formed to be inseparable from the peripheral portion 83 toward the closing direction of the lid 80, so as to be inseparable from the protruding portion 87a. By providing such ribs 87 on the lid 80, the strength of the lid 80 can be improved. By improving the strength of the lid 80 in this way, it is possible to suppress the bending of the lid 80 when opening and closing it, making the opening and closing operation of the lid 80 easier and more reliable. [Industrial applicability]

[0104] The paper lid material of the present invention is suitably used, for example, in applications where it is attached to a packaging body containing items such as cleaning sheets like wet wipes to constitute a packaging container. [Explanation of Symbols]

[0105] 1A~1D Packaging container 2 Packaging 3 Article outlet 10A~10D Paper lid material 20.70 Main unit 23,73 Base section 24,74 Support part 25,75 aperture 30,80 lid 31,81 Cover section 34a, 84a Tapered surface 40,90 hinge 50,60,100,110 Locking means 51,61,101,111 Lingulae 52, 62, 102, 112 Locking claw pieces 63,103,113 Convex portion (lingual unilateral) 64,104,114 Recess (tongue-shaped, unilateral) 65, 105, 115 Recessed (one side of the locking claw) 66, 106, 116 Protrusions (one side of the locking claw) 86 Concave M Goods

Claims

1. A paper lid material attached to a packaging body for storing goods, such as to cover the opening for dispensing the goods provided in the packaging body, A main body having a base portion provided with an opening corresponding to the article dispensing outlet, A lid is attached to the main body via a hinge so as to be openable and closable, Equipped with, The lid is a paper lid material having a cover portion that covers the opening and abuts against the inner periphery of the opening when the lid is closed relative to the main body.

2. The paper lid material according to claim 1, wherein the main body further has a support portion that supports the base portion such that the base portion is spaced apart from the packaging body.

3. The paper lid material according to claim 1, wherein the cover portion has a tapered surface that narrows in the closing direction of the lid so as to contact the inner peripheral edge of the opening in line when the lid is closed.

4. The paper lid material according to claim 1, wherein the cover portion has a concave surface formed by recessing at least the portion facing the article dispensing opening in the closed lid state in the direction of opening the lid.

5. The paper lid material according to claim 1, further comprising a locking means for maintaining the closed lid state.

6. The aforementioned locking means is A tongue-shaped piece extending from the cover portion or the base portion at a position spaced apart from the hinge, A locking claw piece is provided on the base portion or the cover portion so as to be able to engage with the tongue-shaped piece in the closed lid state, A paper lid material according to claim 5, including the following:

7. The tongue-shaped piece has a convex portion that protrudes relatively laterally and a concave portion that is relatively recessed, The paper lid material according to claim 6, wherein the locking claw piece has a recess and a protrusion whose shape matches the protrusion and the recess of the tongue-shaped piece in a plan view.

8. The paper lid material according to claim 1, wherein the main body has a horizontally elongated shape in plan view, and the hinge is provided on one side in the longitudinal direction of the main body.

9. A packaging body for storing goods, A paper lid material according to any one of claims 1 to 8, which is attached to the packaging body so as to cover the article dispensing opening provided in the packaging body, A packaging container equipped with the following features.

10. The packaging container according to claim 9, wherein the article is a cleaning sheet.

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