Paper tubular container

Abstract

To provide a paper tubular container which maintains strength and light shielding property of a body part, and which allows for confirming the state of the inside such as a residual amount of a stored content after use start.SOLUTION: A paper tubular container includes: a body part one end of which is closed and which can store a content; and a pour-out port part which is mounted on the other end of the body part and which can close the other end of the body part. In the body part, at least a paper layer, an adhesive layer, and a transparent laminate film layer are laminated in this order from an outermost layer side. The body part includes a peeling piece which is peeled via the adhesive layer. The peeling piece is formed of a hinge part, and a cut made in the paper layer, leaving the hinge part uncut.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a paper tube-shaped container.

Background Art

[0002] Tube-shaped containers capable of filling and packaging pharmaceuticals, cosmetics, foods, etc. are known. As the configuration of the body portion constituting this tube-shaped container, a sheet using paper is used, and there is one in which the sheet is formed into a tube shape. For example, Patent Document 1 describes a body portion for a tube-shaped container that has an outermost layer and an innermost layer made of a heat-sealable resin and a paper layer in the intermediate layer, and is formed into a cylindrical shape by side-sealing the outermost layer and the innermost layer using a high-frequency sealing method. Further, Patent Document 2 describes a tube-shaped container having a body portion formed by cutting a laminate mainly made of paper and having thermoplastic resin layers at least in the outermost layer and the innermost layer into a rectangular shape, folding both side ends of one blank with the innermost layers overlapped, and thermally fusing them to form a body portion seal portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The tube-shaped containers described in Patent Document 1 and Patent Document 2 above reduce the amount of plastic used by using paper, but there is a problem that the internal state such as the remaining amount of the contents cannot be confirmed due to the opaque paper. Paper has the advantage of improved light-shielding properties compared to a transparent laminate film, and by using such paper, changes in the contents due to light can be suppressed. Therefore, in order to be able to check the internal state such as the remaining amount of the contents while using paper, for example, with the paper sheet 61 wound around and a pair of opposing edges of the sheet 61 separated from each other, a transparent tape material 62 is attached to the inner peripheral surface side of the body 60 of the sheet 61 so as to cover the pair of edges and join the pair of edges to each other. A method can be considered (see FIGS. 7(a) and 7(b)). However, the exposed portion of the tape material 62 becomes a vulnerable part, and there is also a risk that the body 60 may be damaged due to impacts or drops during distribution or use. In addition, since a transparent portion is always exposed, only that portion has no light-shielding property. Therefore, it could not be used as a paper tube-shaped container for contents that are vulnerable to light and ultraviolet rays.

[0005] Therefore, an object of the present invention is to provide a paper tube-shaped container that maintains the strength and light-shielding property of the body and enables checking of the internal state such as the remaining amount of the contents accommodated after the start of use.

Means for Solving the Problems

[0006] The invention according to claim 1 is a paper tube-shaped container including a body having one end closed and capable of accommodating contents, and a spout portion attached to the other end of the body and capable of closing the other end of the body. The body is laminated in order from the outermost layer side with at least a paper layer, an adhesive layer, and a transparent laminate film layer, and has a release piece peeled off through the adhesive layer. The release piece has Provided in a portion covering the edge of the pouring outlet a hinge portion and is formed by a cut made in the paper layer leaving the hinge portion. The adhesive strength between the paper layer and the transparent laminate film layer is 1 N / 15 mm or more and 3 N / 15 mm or less. It is a paper tube-shaped container characterized by this.

[0007] The invention according to claim 2 is the paper tube-shaped container according to claim 1, characterized in that the basis weight of the paper layer is 20 g / m 2 or more and 200 g / m 2 or less.

[0009] The invention according to claim 3 is the formerRecording cylinder The other end of the part is attached to the surface of the peripheral edge of the spout part on the side opposite to the one end side of the barrel part of the spout part at the peripheral edge of the spout part, characterized in that, Claim 1 Or 2 It is the paper tube-shaped container according to Claim 1.

[0010] Claim 4 In the invention according to Claim, the spout part includes a flat closing part orthogonal to the height direction of the barrel part, the peripheral edge part is the edge of the closing part, and the other end of the barrel part is at the peripheral edge part, It is adhered to the surface of the closing part on the side opposite to the one end side of the barrel part of the closing part, characterized in that, Claim 3 It is the paper tube-shaped container according to Claim 1.

Effect of the Invention

[0011] In the paper tube-shaped container of the present invention, the barrel part in which the content is accommodated is laminated in order from the outermost layer side at least with a paper layer, an adhesive layer, and a transparent laminate film layer, and has a peeling piece peeled off through the peeling layer. Further, the peeling piece is formed by a hinge part and a cut made in the paper layer made leaving the hinge part. Therefore, by turning over the peeling piece after the start of use, it is possible to check the internal state such as the remaining amount of the content accommodated through the transparent laminate film layer. In addition, the peeling piece can be turned over while being connected by the hinge part instead of being completely peeled off by the hinge part, and since it has a structure that can be opened and closed at the barrel part by the adhesive layer, there is no risk that the peeling piece will be peeled off during distribution or use and the transparent laminate film layer will be left exposed. Therefore, it is possible to maintain the strength and light shielding properties of the barrel part.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0013] Hereinafter, examples of embodiments of the paper tube-shaped container according to the present invention will be described with reference to the drawings as necessary.

[0014] <Paper Tube-shaped Container of the First Embodiment> With reference to FIGS. 1, 4 to 6, the paper tube-shaped container 100 of the first embodiment will be described. FIG. 1(a) is a front perspective view before turning up the peeling piece 20 of the paper tube-shaped container 100 according to the first embodiment. FIG. 1(b) is a front perspective view after turning up the peeling piece 20 of the paper tube-shaped container 100 according to the first embodiment. FIG. 5 is an enlarged cross-sectional view taken along line A-A in the vicinity of the spout portion 3 in FIG. 4. FIG. 6 is a cross-sectional view showing an example of the layer structure of the laminated sheet 50 constituting the body portion 10 of the paper tube-shaped container 100 according to the first embodiment.

[0015] As shown in FIG. 1, the paper tube-shaped container 100 includes a body portion 10 capable of accommodating contents and a spout portion 3. The body portion 10 has a bottom portion 2 located at one end closed, and the contents (not shown) are accommodated therein. The spout portion 3 is attached to the other end of the body portion 10 and includes a flat closing portion 4 orthogonal to the height direction of the body portion 10 so as to be able to close the other end of the body portion 10. In FIG. 1, the height direction of the body portion 10 is the axial direction of the body portion 10 connecting the bottom portion 2 located at one end of the body portion 10 and the spout portion 3 attached to the other end of the body portion 10.

[0016] As an example, the body portion 10 is formed by forming a laminated sheet 50 having a pair of substantially parallel edges into a cylindrical shape, and then adhering the inner surfaces of the edge portions of the laminated sheet 50, which are the edges along the height direction of the body portion 10, to each other in a butted manner (not shown), and then laying the butted portion on one side so that the paper layers 52 on the surface contact each other and adhering them with an adhesive or the like.

[0017] As shown in FIG. 6, the laminated sheet 50 is laminated with an ink layer 51, a paper layer 52, an adhesive layer 53, and a transparent laminate film layer 54 in this order from the outermost layer side. Also, as shown in FIG. 1, the body portion 10 has a peeling piece 20 peeled off through the adhesive layer 53.

[0018] This peeling piece 20 is formed by a hinge portion 30 and a cut 40 made in the paper layer 52 leaving the hinge portion 30. The cut 40 is formed by a perforation penetrating only the paper layer 52 or a half cut into the paper layer 52 (FIG. 1 is formed by a perforation), and since it is formed leaving the hinge portion 30, the peeling piece 20 peeled off through the adhesive layer 53 is formed as a so-called window portion that can be opened and closed in the body portion 10.

[0019] Therefore, as shown in Fig. 1(b), by turning over the peeling piece 20 after the start of use, it is possible to check the internal state such as the remaining amount of the contents accommodated through the transparent laminate film layer 54. Further, the peeling piece 20 can be turned over while being connected by the hinge portion 30 instead of being completely peeled off by the hinge portion 30, and since it has a structure that can be opened and closed in the body portion 10, there is no risk that the peeling piece 20 will be peeled off during distribution or use and the transparent laminate film layer 54 will remain exposed. Therefore, it is possible to maintain the strength and light-shielding property of the body portion 10.

[0020] In addition, the location is indicated by printing or the like so that the start of turning can be recognized, and it is preferable that one or more of micro-adhesive application, release varnish application, or anti-setting treatment is performed partially between the paper layer 52 and the adhesive layer 53 to make it easier to turn over the peeling piece 20. Regarding the perforation, even if it is called a perforation, for the portion indicated by the above printing or the like so that the transparent laminate film layer 54 is exposed by turning along the cut 40, it is preferable to make a linear cut 40 instead of a perforation shape to a length that can be turned with a finger. Also, in the case of a half cut, for the portion indicated by the above printing or the like so that the transparent laminate film layer 54 is exposed by turning along the cut 40, it is preferable to make a cut 40 that penetrates the paper layer 52 instead of a half cut to a length that can be turned with a finger.

[0021] As shown in Fig. 1, the position where the peeling piece 20 is formed is at the edge of the closing portion 4 at the boundary between the spout portion 3 and the body portion 10 on the front side. The portion covering the edge of the closing portion 4 is used as the hinge portion 30, and an inverted U-shaped cut 40 is formed from that portion in the direction of one end side of the body portion 10. Since the portion covering the edge of the closing portion 4 at the boundary between the spout portion 3 and the body portion 10 is a portion that is already bent when forming the paper tube-shaped container 100, the operation of turning over the peeling piece 20 and bending it at the hinge portion 30 after the start of use becomes unnecessary.

[0022] The position and shape of the peel-off piece 20, i.e., the position and shape of the incision 40, are not particularly limited as long as the internal condition, such as the remaining amount of contents, can be confirmed by flipping over the peel-off piece 20, and can be selected arbitrarily depending on the size and shape of the paper tubular container 100.

[0023] 6, the laminate sheet 50 is formed by laminating, from the outermost layer side, an ink layer 51, a paper layer 52, an adhesive layer 53, and a transparent laminate film layer 54 in this order. The transparent laminate film layer 54 is formed by laminating, for example, a barrier layer 55, a base film layer 56, and a sealant layer 57 in this order from the outermost layer side.

[0024] Next, each layer constituting the laminated sheet 50 will be described.

[0025] (paper layer) The material used for the paper layer 52 is not particularly limited as long as it is opaque and has light-shielding properties, but it is possible to use Unryu paper for aesthetics, thick craft paper for rigidity, etc. Furthermore, the paper layer 52 can be defined as containing cellulose fibers by containing 5% or more cellulose fibers, which distinguishes it from synthetic paper made by papermaking resin fibers.

[0026] The basis weight of the paper layer 52 is 20 g / m 2 More than 200g / m 2 It is preferable that the weight is 50 g / m or less. 2 More than 150g / m 2 It is more preferable that the basis weight of the paper layer 52 is 20 g / m or less. 2 If the thickness is less than 200 g / m, the light-shielding effect is poor, and it becomes difficult to bond the paper layer 52 to the transparent laminate film layer 54. In addition, the paper layer 52 is too thin, and it becomes difficult to perform scratching, which is the incision 40 for forming the release piece 20. 2 If it exceeds this value, the paper layer 52 will become hard, making it difficult to fold the pleats when welding to the spout portion 3.

[0027] The paper layer 52 has perforations 40 extending therethrough.

[0028] (Barrier layer) The barrier layer 55 is laminated to block oxygen, water vapor, etc., and improve the storage properties of the contents.

[0029] This barrier layer 55 has transparency and can be composed of, for example, one or more of a vapor deposition film of an inorganic compound such as nylon, silica, or alumina, a metal vapor deposition film such as aluminum, a metal foil such as aluminum, a plate-like mineral, and / or a coating film of a barrier coating agent containing a barrier resin. As the barrier resin used in the barrier coating agent, an ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), etc. can be used, and a binder resin other than the barrier resin is appropriately blended in the barrier coating agent. The barrier layer 55 may be laminated on the base material film layer 56 in advance to form a barrier film, or may be provided as a single-layer film.

[0030] (Base material film layer) The material used for the base material film layer 56 is not particularly limited as long as it has transparency, but from the viewpoints of heat resistance, toughness during heating, and physical strength, a stretched film such as a polyolefin, polyester, or polyamide such as nylon is preferable.

[0031] (Sealant layer) The sealant layer 57 is the innermost layer of the laminated sheet 50 and is a thermoplastic resin layer. The sealant layer 57 is the layer that is sealed when the laminated sheet 50 is formed into a cylindrical shape. Also, since the sealant layer 57 is the layer that adheres the cylindrical body portion 10 to the spout portion 3, it is preferably suitable for adhesion to the spout portion 3 and is preferably made of the same material as the thermoplastic resin used for the spout portion 3. By making the thermoplastic resin used for the sealant layer 57 the same as the thermoplastic resin layer used for the spout portion 3, the sealing strength between the body portion 10 and the spout portion 3 can be improved.

[0032] The material used for the sealant layer 57 is not particularly limited as long as it has transparency and is a thermoplastic resin. For example, polypropylene, polyethylene, cyclic polyolefin, polyester, etc. are preferable. Further, the softening temperature of the sealant layer 57 needs to be 20°C or more lower than the softening temperature of the base film layer 56, and more preferably 40°C or more lower. If the temperature obtained by subtracting the softening temperature of the sealant layer 57 from the softening temperature of the base film layer 56 is less than 20°C, the base film layer 56 may soften during the sealing of the body portion 10 for forming the cylindrical laminated sheet 50, and there is a high possibility that minute holes (pinholes) will occur in the body portion 10.

[0033] (Adhesive layer) The adhesive layer 53 is a layer for enabling adhesion and peeling between the paper layer 52 and the transparent laminate film layer 54. In FIG. 6, it is laminated between the paper layer 52 and the barrier layer 55 which is the outermost layer of the transparent laminate film layer 54.

[0034] The composition of the adhesive layer is a thermoplastic resin having transparency and contains, for example, one or more of various hot melt materials such as polyolefin, polyacrylic acid, PE-based and PP-based materials. It is not particularly limited as long as it can be heat-sealed to the outermost layer (barrier layer 55 in FIG. 6) constituting the transparent laminate film layer 54 with the above-described composition, but it is preferable that the material is the same as that of the outermost layer (barrier layer 55 in FIG. 6) constituting the transparent laminate film layer 54 because the adhesive strength is higher.

[0035] The adhesive strength between the paper layer 52 and the transparent laminate film layer 54 is preferably 0.5 N / 15 mm or more and 7 N / 15 mm or less. Among them, an adhesive strength of 1 N / 15 mm or more and 3 N / 15 mm or less is more preferable. If the adhesive strength between the paper layer 52 and the transparent laminate film layer 54 is less than 0.5 N / 15 mm, the strength is insufficient and the paper layer 52 and the transparent laminate film layer 54 will float. If the adhesive strength between the paper layer 52 and the transparent laminate film layer 54 exceeds 5 N / 15 mm, the adhesive strength between the paper layer 52 and the transparent laminate film layer 54 becomes too strong, making it difficult to open and close the peeling piece 20 made of the paper layer 52. Also, the adhesion of the adhesive layer 53 to the transparent laminate film layer 54 is set to be weaker than the adhesion state of the cured sealant layer 57.

[0036] Also, in order to provide a place where the peeling piece 20 peeled off through the adhesive layer 53 starts to peel (start to turn up) and make it easier to turn up the peeling piece 20, one or more of micro-adhesive application, release varnish application, or anti-pasting treatment can be partially applied between the paper layer 52 and the adhesive layer 53.

[0037] The micro-adhesive and the release varnish include, for example, an acrylic resin, a silicone resin, or a rubber resin and a cross-linking agent. The anti-pasting treatment is, for example, a method of printing ink, varnish, etc.

[0038] (Ink layer) The ink layer 51 is a layer applied by printing to perform various displays. In FIG. 6, it is partially laminated only on the surface of the paper layer 52 opposite to the adhesive layer 53, but the location where the ink layer 51 is laminated is not particularly limited.

[0039] The type of ink used for the ink layer 51 is not particularly limited, but it is preferable to select one suitable for the printing method and the printing substrate. The printing method in the ink layer 51 is not particularly limited, but for example, general printing methods such as gravure printing, offset printing, and flexographic printing can be used.

[0040] Note that the body portion 10 of the paper tubular container 100 of the present invention may not have an ink layer 51, and it is sufficient that at least the paper layer 52, the adhesive layer 53, and the transparent laminate film layer 54 are laminated in this order from the outermost layer side.

[0041] The laminated sheet 50 using the above layers is produced, for example, as follows.

[0042] The ink layer 51 is laminated (printed) on one surface of the paper layer 52, and a perforated cut 40 is provided in the paper layer 52 in advance using a cutter or the like with a blade so that the peeling piece 20 is formed. When providing the half-cut 40 in the paper layer 52, it can be provided by a blade or a laser device. Further, on the sealant layer 57, the base material film layer 56 and the barrier layer 55 are laminated in this order and dry-laminated with a dry-lamination adhesive to produce the transparent laminate film layer 54.

[0043] The adhesive layer 53 is laminated on the surface of the barrier layer 55 opposite to the base material film layer 56, and the paper layer 52 printed with the cut 40 provided thereon is supplied and laminated in a plurality of rows in a stripe shape with the printed surface facing up on the surface of the adhesive layer 53 opposite to the barrier layer 55. The paper layer 52 and the transparent laminate film layer 54 are bonded by extruder lamination with the adhesive layer 53.

[0044] The laminated sheet 50 preferably has a thickness of 30 μm or more and 300 μm or less. With this thickness, in the paper tubular container 100 using the body portion 10 composed of the laminated sheet 50, it is easy to squeeze out the contents with a light force. Further, when squeezing out the contents, the body portion 10 can be evenly crushed to the end, the radius of curvature at the widthwise end of the body portion 10 can be reduced, and the remaining of the contents can be suppressed.

[0045] The body portion 10 using the above laminated sheet 50 is produced, for example, as follows.

[0046] The body portion 10 is formed, for example, by bringing the inner surfaces of strip-shaped portions each including one of a pair of edges of a laminated sheet 50 having a pair of substantially parallel edges into contact with each other, laying the contact portion on one side, bringing the paper layers 52 on the surfaces into contact with each other, and adhering them with an adhesive or the like. The body portion 10 can be produced using a bag-making machine, a pillow-stick packaging machine, or the like. After closing the bottom portion 2 located at one end of the body portion 10, the contents are accommodated.

[0047] The method of adhering the laminated sheets 50 to each other at the bottom portion 2 is not particularly limited. For example, a method can be used in which an adhesive layer containing polyethylene is provided between the innermost layers of the opposed laminated sheets 50 and these are heat-welded. Further, the other end of the body portion 10 is sealed to the spout portion 3.

[0048] Next, the structure near the spout portion 3 of the paper tube-shaped container 100 will be described.

[0049] As shown in FIGS. 1, 4, and 5, the spout portion 3 is a member attached to the top portion 1 located at the other end of the body portion 10 and capable of closing the top portion 1 of the body portion 10. As described above, the spout portion 3 includes a flat closing portion 4 orthogonal to the height direction of the body portion 10. The closing portion 4 is, for example, disc-shaped, but its shape is not limited as long as it is flat, and it may be elliptical, oval, polygonal, or the like. The material of the spout portion 3 is not particularly limited, but a resin material such as low-density polyethylene can be preferably used. Further, by using a material having a barrier function also for the spout portion 3 together with the body portion 10, the barrier function of the entire paper tube-shaped container 100 can be improved, and the quality of the contents can be better protected. The spout portion 3 having the closing portion 4 formed in a flat shape can reduce the material used as compared with the spout portion 3 according to the prior art formed in a tapered shape.

[0050]

[0051] ​The closing part 4 has, as an example, an annular half cut 6 at a substantially central part, and a pull ring 7 is provided inside the half cut 6. By the closing part 4 having the half cut 6 and the pull ring 7, a user of the paper tubular container 100 can form an opening for taking out the content in the closing part 4 by pulling the pull ring 7 and removing a part of the closing part 4 along the half cut 6. Note that, an opening for taking out the content in the closing part 4 may be formed in advance without providing the half cut 6 and the pull ring 7.

[0052] The top part 1 of the body part 10 is attached to a surface of the peripheral part 5 of the spout part 3 on the side opposite to the bottom part 2 side of the body part 10 of the spout part 3. In FIG. 5, the top part 1 of the body part 10 is adhered to a surface of the closing part 4 at the edge (peripheral part 5) on the side opposite to the bottom part 2 side of the body part 10 of the closing part 4.

[0053] The welding method of the body part 10 and the closing part 4 is not particularly limited. For example, a method can be used in which a sealant layer 57 containing polyethylene is provided on the innermost layer of the laminated sheet 50, and the spout part 3 is formed of a material containing polyethylene, and these are heat welded. Further, the body part 10 and the closing part 4 can be welded while creating pleats arranged at equal intervals at the top part 1 of the body part 10 along the circumferential direction of the closing part 4.

[0054] Further, the paper tubular container 100 further includes, as an example, a hinge cap (not shown) attached to the spout part 3.

[0055] The hinge cap is a member attached to the spout part 3 and capable of closing and opening the opening formed in the spout part 3.

[0056] Note that, the form for realizing the closing and opening of the opening formed in the spout part 3 is not limited to the hinge cap. For example, a form including a cylindrical part having an external thread provided on the spout part 3 and a cap having an internal thread that can be screwed onto this external thread may be used.

[0057] In the paper tube-shaped container 100, the spout portion 3 is provided with a flat closing portion 4 that is orthogonal to the height direction of the body portion 10, and the top portion 1 of the body portion 10 is adhered to the surface of the closing portion 4 on the side opposite to the bottom portion 2 side of the body portion 10 at the edge of the closing portion 4. Therefore, by bending the body portion 10 with a finger or the like at the edge of the closing portion 4, the contents remaining slightly in the body portion 10 can be sandwiched between the inner plane of the closing portion 4 and the inner surface of the body portion 10 and pushed out toward the periphery of the opening of the spout portion 3.

[0058] Further, since the closing portion 4 of the spout portion 3 is flat, unlike the spout portion 3 formed in a tapered shape as in the prior art, it does not have a space on the inner side that allows the contents to remain. Therefore, the contents pushed out toward the periphery of the opening of the spout portion 3 can be squeezed out from the opening without remaining inside the body portion 10 and the spout portion 3. As a result, the remaining of the contents inside the container can be suppressed.

[0059] In the paper tube-shaped container 100, as described above, the remaining of the contents can be suppressed by squeezing the contents while bending the body portion 10. Therefore, it is preferable to form the body portion 10 with a laminated sheet 50 having low rigidity (not strong in stiffness) that can be easily bent.

[0060] As described above, by setting the thickness of the laminated sheet 50 constituting the body portion 10 to be 30 μm or more and 300 μm or less, in the paper tube-shaped container 100 using the body portion 10 composed of the laminated sheet 50, the contents can be easily squeezed out with a light force, and the remaining of the contents can be suppressed. Also, the body portion 10 can be easily bent.

[0061] Further, when the above-described hinge cap is provided as the cap, compared with the case of providing a cap that is screwed to the closing portion 4 and rotated to open the cap, the rigidity required for the torsional resistance of the body portion 10 that is grasped by hand when opening the cap can be reduced. Therefore, it is preferable because it is easy to adopt the laminated sheet 50 having low rigidity.

[0062] <Paper tube-shaped container of the second embodiment> With reference to FIGS. 2, 4 to 6, the paper tube-shaped container 101 of the second embodiment will be described. FIG. 2 is a front perspective view of the paper tube-shaped container 101 according to the second embodiment before turning up the peeling piece 21. FIG. 4 is a side view of the paper tube-shaped container 101 according to the second embodiment. FIG. 5 is an enlarged cross-sectional view taken along line A-A in the vicinity of the spout portion 3 of FIG. 4. FIG. 6 is a cross-sectional view showing an example of the layer structure of the laminated sheet 50 constituting the body portion 11 of the paper tube-shaped container 101 according to the second embodiment.

[0063] The difference between the paper tube-shaped container 101 of the second embodiment and the paper tube-shaped container 100 of the first embodiment is only the formation position of the peeling piece, and the rest is the same, so the description of the rest will be omitted.

[0064] As shown in FIG. 2, the position where the peeling piece 21 is formed is at a substantially central position of the body portion 11 on the front surface. A portion on one end side of the body portion 11 from the center is used as the hinge portion 31, and a U-shaped cut 41 is formed from that portion in the direction of the other end side of the body portion 11.

[0065] <Paper tube-shaped container of the third embodiment> With reference to FIGS. 3, 4 to 6, the paper tube-shaped container 102 of the third embodiment will be described. FIG. 3 is a front perspective view of the paper tube-shaped container 102 according to the third embodiment before turning up the peeling piece 22. FIG. 4 is a side view of the paper tube-shaped container 102 according to the third embodiment. FIG. 5 is an enlarged cross-sectional view taken along line A-A in the vicinity of the spout portion 3 of FIG. 4. FIG. 6 is a cross-sectional view showing an example of the layer structure of the laminated sheet 50 constituting the body portion 12 of the paper tube-shaped container 102 according to the third embodiment.

[0066] The difference between the paper tube-shaped container 102 of the third embodiment and the paper tube-shaped container 100 of the first embodiment is only the formation position of the peeling piece, and the rest is the same, so the description of the rest will be omitted.

[0067] As shown in Fig. 3, the position where the peeling piece 22 is formed is a position that covers the edge on the other end side of the body portion 12 of the bottom portion 2 on the front side. A portion that covers the edge on the other end side of the body portion 12 is used as the hinge portion 32, and an inverted U-shaped cut is formed from that portion in the direction of one end side of the body portion 12.

[0068] Note that the position where the peeling piece is formed is not limited to the position of the peeling piece according to the first to fourth embodiments, and may be, for example, a combination of two or more of the positions of the peeling pieces according to the first to third embodiments.

Example

[0069] The inventor of the present application conducted tests to confirm the ease of peeling of the peeling piece, the strength of the body portion (drop resistance, impact resistance), and the light shielding property using the paper tube-shaped containers of Examples 1 to 3 and Comparative Examples 1 to 4.

[0070] Next, each body portion of Examples 1 to 3 and Comparative Examples 1 to 4 will be described.

[0071] (Example 1) The laminated sheet constituting the body portion in Example 1 uses, as the paper layer, unbleached kraft paper with a basis weight of 70 g / m 2 (manufactured by Oji Efftex Co., Ltd.). As the transparent laminate film layer, a 15-μm-thick nylon (manufactured by Unitika Ltd., trade name: ONBC) and a 12-μm-thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., trade name: GL-ARH-F) are sequentially laminated on a 50-μm-thick polyethylene (manufactured by Tamapoly Co., Ltd., trade name: SE620A) by dry lamination using an adhesive.

[0072] In the paper layer, perforated cuts were provided in advance using a cutter with a blade so that the peeling piece would be formed. The position where the peeling piece is formed is, in the same manner as the paper tube-shaped container 101 according to the second embodiment, at a position approximately in the center of the body portion on the front side. A portion from the center to one end side of the body portion is used as the hinge portion, and a U-shaped cut is formed from that portion in the direction of the other end side of the body portion.

[0073] The above paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength of 0.5 N / 15 mm between the paper layer and the transparent laminate film layer.

[0074] (Example 2) In Example 2, the laminated sheet constituting the body part used, as the paper layer, unbleached kraft paper (manufactured by Oji Efftex Co., Ltd.) with a basis weight of 120 g / m 2 and used the same transparent laminate film layer as in Example 1.

[0075] The paper layer was provided in advance with perforated cuts so that peeling pieces were formed at the same positions and shapes as in Example 1.

[0076] The above paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength of 1.5 N / 15 mm between the paper layer and the transparent laminate film layer.

[0077] (Example 3) In Example 3, the laminated sheet constituting the body part used, as the paper layer, unbleached kraft paper (manufactured by Oji Efftex Co., Ltd.) with a basis weight of 80 g / m 2 and used the same transparent laminate film layer as in Example 1.

[0078] The paper layer was provided in advance with perforated cuts so that peeling pieces were formed at the same positions and shapes as in Example 1.

[0079] The above paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength of 2.8 N / 15 mm between the paper layer and the transparent laminate film layer.

[0080] (Comparative Example 1) In Comparative Example 1, the laminated sheet constituting the body part used the same materials for both the paper layer and the transparent laminate film layer as in Example 1.

[0081] The paper layer was pre-provided with perforated cuts so that peeling pieces were formed at the same positions and shapes as in Example 1.

[0082] The paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength between the paper layer and the transparent laminate film layer of 0.1 N / 15 mm.

[0083] (Comparative Example 2) For the laminated sheet constituting the body part in Comparative Example 2, the same paper layer and the same transparent laminate film layer as those in Example 1 were used.

[0084] The paper layer was pre-provided with perforated cuts so that peeling pieces were formed at the same positions and shapes as in Example 1.

[0085] The paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength between the paper layer and the transparent laminate film layer of 10.0 N / 15 mm.

[0086] (Comparative Example 3) For the laminated sheet constituting the body part in Comparative Example 3, paper with a basis weight of 300 g / m 2 was used as the paper layer, and the same transparent laminate film layer as that in Example 1 was used.

[0087] The paper layer was pre-provided with perforated cuts so that peeling pieces were formed at the same positions and shapes as in Example 1.

[0088] The paper layer and the transparent laminate film layer were bonded by extruder lamination using an adhesive with an adhesive strength between the paper layer and the transparent laminate film layer of 1.8 N / 15 mm.

[0089] (Comparative Example 4) For the laminated sheet constituting the body part in Comparative Example 4, the same paper layer and transparent laminate film layer as those in Example 1 were used.

[0090] In the case of Example 4, without providing a cut in the paper layer, as shown in FIG. 7, with the laminated sheet wound around and a pair of opposing edges of the sheet separated from each other, a transparent tape material was attached to the inner peripheral surface side of the body part in the sheet so as to cover the pair of edges while joining the pair of edges to each other on the inner peripheral surface side of the body part, making the interior visible.

[0091] The above-mentioned paper layer and transparent laminate film layer were bonded by extruder lamination with an adhesive having an adhesive strength of 2.0 N / 15 mm between the paper layer and the transparent laminate film layer.

[0092] (Evaluation Items and Test Methods) [Ease of Lifting the Peel Piece] The ease of lifting the peel piece through the adhesive between the paper layer and the transparent laminate film layer was evaluated. [Drop Test] Based on JIS Z0200, a drop test was conducted on each paper tube-shaped container packed in a cardboard box for collective packaging, and the measurement was carried out under the condition of a drop height of 80 cm (Level 1). [Random Vibration Test] Based on JIS Z0200, a random vibration test was conducted on each paper tube-shaped container packed in a cardboard box for collective packaging, and the measurement was carried out under the condition of Level 1. [Light Shielding Property] The presence or absence of exposure of the transparent part (transparent laminate film layer or tape material) was visually evaluated.

[0093] (Test Results and Considerations) The test results by the above test methods are shown in Table 1. In Table 1, for the evaluation item of "ease of turning up the peeling piece", if the peeling piece was particularly easy to turn up, it was evaluated as ◎; if the peeling piece was easy to turn up, it was evaluated as 〇; otherwise, it was evaluated as ×. For the evaluation items of "drop test" and "vibration test", if the contents did not leak, it was evaluated as 〇; if the contents leaked, it was evaluated as ×. For the evaluation item of "light shielding property", if the transparent part (transparent laminate film layer or tape material) was not exposed and it had light shielding property, it was evaluated as 〇; if the transparent part was completely exposed, it was evaluated as ×. Also, the above evaluation items were comprehensively evaluated, and if it was good, it was evaluated as 〇, if it was close to being bad, it was evaluated as △, and if it was bad, it was evaluated as ×.

[0094] In Examples 2 and 3, the "ease of turning up the peeling piece" was ◎, and for the other evaluation items of Examples 1 to 3, they were all 〇. Therefore, the comprehensive evaluations of Examples 1 to 3 were all 〇.

[0095] On the other hand, in Comparative Example 1, since the adhesive strength between the paper layer and the transparent laminate film layer was too weak, the space between the paper layer and the transparent laminate film layer remained peeled. In Comparative Example 2, conversely, since the adhesive strength between the paper layer and the transparent laminate film layer was too strong, the peeling piece was difficult to turn up. In Comparative Example 3, the paper was too thick and became hard, and originally, when welding to the spout part, pleats could not be folded in, so the body part could not be attached to the spout part and a paper tube-shaped container could not be formed, thus it was not evaluable. In Comparative Example 4, since a part of the transparent tape material was always completely exposed, it had no light shielding property.

[0096] From the above test results, it can be seen that when the basis weight of the paper layer is 20 g / m 2 or more and 200 g / m 2 or less, and the adhesive strength between the paper layer and the transparent laminate film layer is 0.5 N / 15 mm or more and 7 N / 15 mm or less, and further, when there is a hinge part and a peeling piece formed by a cut made to the paper layer leaving the hinge part, it can be known that the peeling piece is easy to turn up and the internal state can be confirmed, and at the same time, the strength and light shielding property of the body part can be maintained.

[0097]

Table 1

[0098] As described above, in the paper tube-shaped container of the present invention, the body portion for accommodating the content is laminated in the order of at least a paper layer, an adhesive layer, and a transparent laminate film layer from the outermost layer side, and has a peeling piece peeled off through the peeling layer. Further, the peeling piece is formed by a hinge portion and a cut made in the paper layer made leaving the hinge portion. Therefore, by turning up the peeling piece after the start of use, it is possible to check the internal state such as the remaining amount of the content accommodated through the transparent laminate film layer. Further, the peeling piece is not completely peeled off by the hinge portion, but can be turned up in a state connected by the hinge portion, and since it has a structure that can be opened and closed at the body portion by the adhesive layer, there is no possibility that the peeling piece is peeled off during distribution or use and the transparent laminate film layer remains exposed. Therefore, it is possible to maintain the strength and light-shielding property of the body portion.

Explanation of Signs

[0099] 1 ··· Top 2 ··· Bottom 3 ··· Pouring outlet portion 4 ··· Closing portion 5 ··· Peripheral edge portion (edge of the closing portion) 6 ··· Annular half cut 7 ··· Pull ring 10, 11, 12 ··· Body portion 20, 21, 22 ··· Peeling piece 30, 31, 32 ··· Hinge portion 40, 41, 42 ··· Cut 100, 101, 102 ··· Paper tube-shaped container 50 ··· Laminated sheet 51 ··· Ink layer 52 ··· Paper layer 53 ··· Adhesive layer 54 ··· Transparent laminate film layer 55 ··· Barrier layer 56 ··· Base film layer 57···Sealing layer 60···Body part of a conventional paper tubular container 61···Paper sheet 62···Transparent tape material

Claims

1. A paper tube-shaped container including a barrel portion with one end closed and capable of accommodating contents, and a spout portion attached to the other end of the barrel portion and capable of closing the other end of the barrel portion, wherein the barrel portion is laminated from the outermost layer side in at least the order of a paper layer, an adhesive layer, and a transparent laminate film layer, and has a peeling piece peeled off through the adhesive layer, the peeling piece is formed by a hinge portion provided at a portion covering the edge of the spout portion and a cut made to the paper layer made leaving the hinge portion, and the adhesive strength between the paper layer and the transparent laminate film layer is 1 N / 15 mm or more and 3 N / 15 mm or less. A paper tube-shaped container characterized by this.

2. The basis weight of the paper layer is 20 g / m ２ or more and 200 g / m ２ or less. The paper tube-shaped container according to claim 1, characterized in that it is as described above.

3. The paper tube-shaped container according to claim 1 or 2, wherein the other end of the barrel portion is attached to a surface of the spout portion on the side opposite to the one end side of the barrel portion of the spout portion at the peripheral edge of the spout portion.

4. The spout portion includes a flat closing portion orthogonal to the height direction of the barrel portion, the peripheral edge is the edge of the closing portion, and the other end of the barrel portion is adhered to a surface of the closing portion on the side opposite to the one end side of the barrel portion of the closing portion at the peripheral edge. The paper tube-shaped container according to claim 3, characterized by this.

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