JP2016216121A - Spout stopper and packaging container using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spout stopper having sufficient rigidity that is not broken by ultrasonic vibration in welding, and can be easily separated in disassembling a packaging container, and to provide a packaging container using the spout stopper.SOLUTION: In a spout stopper 1 equipped with a cylindrical side wall 11 and a disk-like flange part 15 provided so as to extend outward from one end edge of the side wall 11, a plurality of recesses 17 partitioned by a plurality of ribs 18 are arranged annularly on the bottom face 20 which is the surface opposite to the side wall 11 of the flange part 15, and a part 22 planned to be cut is formed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a spout stopper and a packaging container using the same.

  A sheet material in which a barrier layer such as an aluminum foil, an aluminum vapor deposition film, or an inorganic oxide vapor deposition film is laminated between a paper base material layer and a thermoplastic resin sealant layer is folded into a box shape. A packaging container formed by overlapping and sealing ends is known (Patent Document 1).

  There are various types of such packaging containers. One of them is a gable top type (gable roof type) roof plate provided with a cap made of polyethylene or the like and a spout stopper, so that the liquid can be poured. There are known packaging containers that can be removed. In the case of such a packaging container, at the time of disposal, it is preferable to separate a container body made of a paper sheet material and a spout stopper welded to the container body for separate collection. As a method of separation, there is a method of opening the top seal portion and cutting the sheet material around the spout plug with scissors or the like. However, such a packaging container is usually not easily disassembled because the top seal part is firmly fused, and the spout stopper is often not separated from the packaging container.

  Patent Document 2 discloses a paper packaging body in which a spout stopper in which an annular thin portion is formed on the inner peripheral upper surface of an annular body (flange portion) is attached to a paper container in which a folding guide line is formed. According to this paper packaging body, by folding the paper packaging body along the folding guide line, the annular thin wall portion is broken, and the tubular body of the spout stopper can be separated from the paper container.

JP 2003-335362 A Japanese Patent No. 5469421

  However, when an annular thin part is formed in the spout stopper as in Patent Document 2, the rigidity of the flange part of the spout stopper is reduced. For this reason, at the time of welding to the paper container, the shape of the flange portion is not stable, and welding unevenness occurs, which may cause liquid leakage. Further, if welding is performed with high energy to prevent this, the spout stopper may be damaged from the thin wall portion by ultrasonic vibration.

  The present invention has been made in view of such problems, and has a sufficient rigidity and is not damaged by ultrasonic vibration during welding, and can be easily separated when the packaging container is disassembled. An object is to provide a stopper and a packaging container using the stopper.

  One aspect of the present invention for solving the above problems is a spout plug comprising a cylindrical side wall and a disk-like flange portion provided so as to extend outward from one end edge of the side wall, On the bottom surface, which is the surface opposite to the side wall of the flange portion, is a spout plug in which a plurality of concave portions partitioned by a plurality of ribs are annularly arranged to form a planned cutting portion.

  Another aspect of the present invention is a container body formed by bending a sheet material into a box shape and overlapping and sealing the end portion, and the above-described container body provided with a pour hole. A fragile portion having a linear shape is formed in the container body, and a broken line formed by bending the container body along the fragile portion passes through the dispensing hole. It is a packaging container.

  According to the present invention, there is provided a spout stopper that has sufficient rigidity, is not damaged by ultrasonic vibration during welding, and can be easily separated when the packaging container is disassembled, and a packaging container using the same. can do.

The perspective view of the packaging container which concerns on one Embodiment of this invention Sectional drawing and top view of the spout stopper concerning one embodiment of the present invention Top view of spout tap according to modification Blank top view Sectional view schematically showing the laminated structure of sheet material Diagram showing how to separate the spout stopper

  The spout stopper 1 and the packaging container 3 which concern on embodiment of this invention are demonstrated with reference to figures.

(Packaging container)
FIG. 1 shows a perspective view of the packaging container 3. The packaging container 3 includes a container main body 100 formed by bending a blank 110 obtained by processing a sheet material 200 described later into a box shape, and overlapping and sealing the ends, and the spout stopper 1. The spout stopper 1 includes a cap 2 as an example. The container main body 100 includes a top portion 101 that is an upper portion when standing upright, a body portion 102 that is a side surface, and a bottom portion 103 that is a lower portion, and the top portion 101 includes two roof plates 106 (106a and 106b) and a roof plate. A folding plate 107 and a folding plate 108 that are folded between 106 are included. A circular pouring hole 114 is formed in the roof plate 106a. The spout stopper 1 is attached to the spout hole 114. As an example, the top portion 101 is formed with a fragile portion 105 having a reduced breaking strength in the width direction, which is the left-right direction when the container body 100 is erected.

(Outlet plug)
FIG. 2 shows a cross-sectional view (a) of the spout stopper 1 and a plan view (b) viewed from below. The spout stopper 1 includes a cylindrical side wall 11, a partition wall 14 that closes the inside of the side wall 11, a disk-shaped flange portion 15, and a plurality of concave portions 17 formed on the bottom surface 20 of the flange portion 15. The spout 1 can be manufactured by integral molding using low density polyethylene (LDPE) or the like. In order to facilitate the separation, it is desirable that the material of the spout stopper 1 has a flexural modulus of 100 MPa to 180 MPa, particularly 120 MPa to 155 MPa.

  The side wall 11 is formed with an outer screw 12 to which a cap is screwed on the outer peripheral surface 21, and a cap 2 having a screw thread formed on the inner peripheral surface can be screwed from above in FIG. Further, on the outer peripheral surface 21 of the side wall 11 and below the external screw 12, three protruding portions 19 projecting outward are formed so as to equally divide the circumference. Further, a disc-shaped flange portion 15 is provided so as to extend outward from the outer peripheral surface 21 of the side wall 11 below the projection portion 19. The surface of the flange portion 15 on the side wall 11 side is attached to the container body 100 by ultrasonic welding. In addition, the container body 100 is sandwiched between the protrusion 19 and the flange 15.

  As shown in FIG. 2B, a plurality of recesses 17 partitioned by a plurality of ribs 18 are annularly arranged on the bottom surface 20 which is the surface of the flange portion 15 opposite to the side wall 11 side. A scheduled cutting portion 22 is formed. The concave portion 17 is a groove having a trapezoidal cross section formed on the bottom surface 20 of the flange portion 15. Various cross-sectional shapes other than the trapezoidal shape can be adopted. Further, projections of various shapes may be formed on each surface of the flange portion 15 as energy directors that enhance the weldability by controlling the degree of concentration of ultrasonic energy when ultrasonic welding is performed.

  The plurality of ribs 18 are provided at 24 locations so as to equally divide the circumference so as to extend radially from the center of the side wall 11 in a plan view of the flange portion 15. As shown in FIG. 2A, the top surface 23 of the rib 18 is formed so as to be included in the same plane as the bottom surface 20 of the flange portion 15. However, the top surface 23 of the rib 18 may be in a position recessed from the bottom surface 20 of the flange portion 15.

  The partition wall 14 is formed near the lower end of the side wall 11 so as to separate the upper end side and the lower end side inside the side wall 11. Moreover, the partition 14 is connected with the side wall 11 through the half cut 16 which formed the outer wall thickness thinly in the shape of a ring. A pull ring 13 is connected to the upper surface of the partition wall 14 via a support column. The user pulls the pull ring 13 upward, pulls out the partition wall 14 broken along the half cut 16 from the side wall 11, and opens the packaging container 3 by communicating the upper end side and the lower end side of the side wall 11. it can.

  The number of ribs 18, the thickness (d 1) of the portion of the flange portion 15 where the recesses are formed, the distance (d 2) where the recesses 17 are separated by each of the plurality of ribs 18, and the width (d 3) of the recesses 17 are preferred. By setting, it is possible to facilitate separation of the flange portion 15 and the side wall 11 with the scheduled cutting portion 22 as a boundary, improve rigidity, and prevent damage due to ultrasonic vibration. For example, if the number of ribs 18 is in the range of 24 to 48 and d1 and d2 are 0.15 mm to 0.3 mm, particularly 0.2 mm to 0.25 mm, damage due to ultrasonic vibration during welding It is possible to facilitate separation of the flange portion 15 and the side wall 11 with the planned cutting portion 22 as a boundary. Further, for example, if the relation from d1 to d3 is d2 ≦ d1, destruction during separation can proceed in the order of d2 and d1, so that smoother separation is possible. Further, for example, if d1 ≦ d3, suitable bends and elongation in the vicinity of the planned cutting portion 22 for smoother separation can be obtained.

(Modification 1 of spout stopper)
The ribs 18 can take a variety of forms. FIG. 3 is a plan view of the spout stopper 1 according to a modification in which the shape of the rib 18 is changed as viewed from the bottom surface 20 side. The plurality of ribs 181 of the spout stopper shown in FIG. 3A are arranged in a rotational direction (note) when the cap 2 is screwed inwardly from the inside of the flange 15 in a plan view of the flange 15. In the case of the outlet plug 1, the outlet plug 1 is formed so as to extend with an inclination of a first predetermined angle less than a right angle with respect to the counterclockwise direction when viewed from the bottom surface 20 side. The first predetermined angle is 60 °, for example. By making the inclination of the rib 181 less than a right angle, it is possible to improve the rigidity of the flange portion 15 with respect to the torque in the tightening direction of the cap 2 and to prevent the flange portion 15 from being damaged in the capping process.

(Modification 2 of spout stopper)
In the spout stopper shown in FIG. 3B, in addition to the rib 181, in the plan view of the flange portion 15, the rotation direction when the cap 2 is screwed inwardly from the inside of the flange portion 15. A plurality of ribs 182 extending without an inclination of a second predetermined angle less than a right angle with respect to the opposite direction are formed. The second predetermined angle is 60 °, for example. As a result, the rib 182 has a honeycomb structure in which the triangular recesses 17 are arranged in a circumferential shape. Therefore, the flange portion 15 can improve the rigidity against a load from each direction parallel to the plane including the flange portion 15. .

(blank)
In FIG. 4, the top view of the blank 110 which is an example of the blank used as the raw material of the container main body 100 is shown. The blank 110 includes roof plates 106a and 106b constituting the top 101, folding plates 107 and folded plates 108, four side plates 111 constituting the body portion 102, a bottom plate 112 constituting the bottom portion 103, and end portions. And a formed seal portion 113. The blank 110 is formed in a box shape by bending the blank 110 in accordance with the one-dot chain line shown in FIG. 4 and sealing the seal portion 113 to the opposite end. A pouring hole 114 for inserting and fixing the pouring spout 1 is formed near the center of the roof plate 106a. In the roof plates 106a and 106b, the folding plate 107, and the folded plate 108, a linear fragile portion 105 is formed on substantially the entire circumference over the width direction that is the left-right direction when the container body 100 is erected. A part of the fragile portion 105 is divided by the extraction hole 114. That is, a broken line formed by bending the container body 100 along the fragile portion 105 passes through the extraction hole 114. The fragile portion 105 may be formed in the vertical direction of the container body 100 as long as a part of the fragile portion 105 is divided by the extraction hole 114.

(Sheet material)
5A and 5B are cross-sectional views schematically showing two examples of the laminated structure of the sheet material 200 used for the blank 110. FIG. Sheet material 200 is printed layer 208 / thermoplastic resin layer 201 / paper base material layer 202 / adhesive resin layer 203 / barrier layer 204 / adhesive layer 205 / sealant layer in order from the outside to the inside of packaging container 3. 206.

  As shown in FIG. 5, a fragile portion 105 is formed in the sheet material 200. The fragile portion 105 is constituted by groove-shaped scratched portions 207a and 207b formed at least on the paper base material layer 202 and the barrier layer 204 at a predetermined depth. The scratched portion 207b of the barrier layer 204 is preferably formed so as to overlap the scratched portion 207a of the paper base material layer 202 in plan view. The scratched portion 207b is desirably formed at a depth that does not penetrate the barrier layer 204, but even if it penetrates in a narrow range, the barrier property is less affected, and may partially penetrate the barrier layer 204. . Further, the scratch processing portion 207a only needs to be formed on at least the paper base material layer 202, and as shown in FIG. 5, the thermoplastic laminated together with the paper base material layer 202 on the outside of the paper base material layer 202. It may be formed on the resin layer 201 and the print layer 208.

  The flaw processing portion 207a can be formed with a depth that allows the paper base material layer 202 to ensure the strength of the packaging container 3. As a method for forming the scratched portion 207a, there are a half punching process and a full punching process using a blade die. In order to ensure the strength of the packaging container 3, the flaws can be formed in a perforated shape. The scratched portion 207b can be formed by laser beam processing after the barrier layer 204 has been bonded. However, when the barrier layer 204 is formed before the barrier layer 204 has been bonded, Punching can be used. Even when the scratched portion 207b is provided before the barrier layer 204 is bonded, it may be formed by laser processing. The scratched portion 207b may also be formed in a perforated shape to ensure strength.

  The thermoplastic resin layer 201 can be formed on the paper base layer 202 by extrusion lamination or the like using a low density polyethylene resin (LDPE), a linear low density polyethylene resin (LLDPE), or the like.

  A print layer 208 may be provided outside the thermoplastic resin layer 201 to display a pattern or product information. The printing layer 208 can be formed by a method such as gravure printing or offset printing using a known ink. Adhesiveness such as corona treatment can be applied to the thermoplastic resin layer 201 to enhance the adhesion with the printing layer 208. An overcoat layer may be provided outside the printed layer in order to improve wear resistance or surface decoration.

  For the paper base layer 202, paperboard such as milk carton base paper can be used. The basis weight and density can be appropriately selected depending on the capacity and design of the container.

  The adhesive resin layer 203 is a layer made of a polyolefin resin having a function of adhering the paper base material layer 202 and the barrier layer 204. Specifically, high density polyethylene resin (HDPE), medium density polyethylene resin (MDPE), LDPE, LLDPE, ethylene / methacrylic acid copolymer (EMAA), ethylene / acrylic acid copolymer (EAA), ionomer, polypropylene (PP) or the like can be used. In order to increase the adhesive strength, the surface of the paper base material layer 202 or the barrier layer 204 may be subjected to corona treatment, ozone treatment, anchor coating, or the like. Alternatively, an adhesive layer using a dry laminate adhesive or the like may be used instead of the adhesive resin layer.

  The barrier layer 204 is a vapor-deposited film including a vapor-deposited layer 204b obtained by vapor-depositing a metal such as aluminum, silica, or alumina, and a base film 204a, or a laminated film obtained by dry-laminating a metal foil 204c such as aluminum on the base film 204a Can be used. In the example illustrated in FIG. 5A, the barrier layer 204 is a vapor deposition film, and includes a base film 204 a and a vapor deposition layer 204 b provided on the inner surface of the packaging container 3. In the example shown in (b) of FIG. 5, the barrier layer 204 is a laminated film, and includes a base film 204 a and a metal foil 204 c provided on the outer side of the packaging container 3. Further, when a scratched portion 207b is formed by laser light irradiation using a laminated film, the metal foil 204c does not block the laser light irradiation on the base film 204a as shown in FIG. 5B. Thus, the barrier layer 204 is laminated so that the vapor deposition layer 204 b or the metal foil 204 c faces the adhesive resin layer 203. As the barrier layer 204, a barrier-coated polyethylene terephthalate film obtained by applying a barrier coating to a polyethylene terephthalate film or a barrier film made of a barrier material such as EVOH can be used.

  As the base film 204a, a resin film such as polyethylene terephthalate (PET), nylon, or polypropylene (PP) can be used. In particular, a biaxially stretched film of PET is suitable because it has little expansion and contraction during vapor deposition and bonding.

  For the adhesive layer 205, a dry laminating adhesive or a non-solvent laminating adhesive may be used, or an extruding process may be used to adhere with a polyolefin resin.

  HDPE, MDPE, LDPE, LLDPE, etc. can be used for the sealant layer 206. There may also be a layer partially containing polybutene. Among the above materials, LLDPE is particularly preferable. The sealant layer 206 is preferably an unstretched film formed by a T-die method or an inflation method. The layer configuration of the sheet material 200 and the mode of the fragile portion 105 can be variously implemented, and are not limited to the examples described above.

  In order to ultrasonically weld the spout stopper 1 to the container body 100, first, the side wall 11 of the spout stopper 1 is inserted into the spout hole 114 of the container body 100 from the inner surface side, and the side wall 11 of the flange portion 15 is formed. This surface is directed to the inner surface of the roof plate 106a. At this time, as shown in FIG. 1, the spout stopper 1 is temporarily fastened to the container main body 100 by sandwiching the peripheral portion of the container main body 100 between the protruding portion 19 and the flange portion 15. Then, an anvil inserted into the inside (inside) of the container body 100 and an ultrasonic horn (both not shown) are applied to the roof plate 106 a overlapping the flange portion 15 to generate ultrasonic vibrations, and the roof plate 106. And the flange portion 15 are welded. The vibration generated at this time causes the flange portion 15 to vibrate. However, since this vibration is absorbed by the rib 18, damage around the recess 17 can be prevented. Further, since the rib 18 is formed, the rigidity of the flange portion 15 is increased. For this reason, at the time of welding, the flange portion 15 can be brought into close contact with the roof plate 106 in a stable state, and as a result, occurrence of welding unevenness can be prevented.

(Disassembly method)
Below, the separation method of the spout stopper 1 is demonstrated. In FIG. 6, each process which concerns on the isolation | separation method of the spout stopper 1 is shown.

<Crushing process>
FIG. 6A shows a step of crushing the packaging container 3. In this step, the user of the packaging container 3 crushes the trunk portion 102 by pushing the two opposing side plates 111 extending below the roof plate 106 in a direction in contact with each other. The two side plates 111 in contact with the side plate 111 to be crushed are folded in the inner direction of the packaging container 3.

<Bending process>
FIG. 6B shows a process of bending the packaging container 3 along the fragile portion 105. In this step, the user bends the roof portion 106 along the fragile portion 105 as shown in FIG. At this time, the broken line formed on the roof plate 106 passes through the extraction hole 114.

  Since the broken line formed in the roof plate 106 passes through the pouring hole 114, a part of the flange portion 15 of the spout stopper 1 attached to the pouring hole 114 is also bent in the same direction as the roof plate 106. A load is applied to. Here, since the cut-out portion 22 is formed in the spout plug 1, the periphery of the spout plug 1 is at least partially broken as shown in the cross-sectional view on the right side of FIG. Occurs.

<Outlet plug separation process>
FIG. 6C shows a process of separating the spout stopper 1 from the packaging container 3. Since the fracture has occurred around the recess 17 of the spout stopper 1 in the previous process, the user cuts the spout stopper 1 along the planned cutting portion 22 with a slight force from this point, and includes the side wall 11. Can be separated from the packaging container 3.

  The spout stoppers according to Examples 1 and 2 and Comparative Example 1 were prepared, and the welding conditions under which each was appropriately welded to the container body were compared. The obtained welding conditions are shown in Table 1.

Example 1
As Example 1, the spout stopper 1 having ribs 18 formed so as to extend radially from the center of the side wall 11 shown in FIG.

(Example 2)
As Example 2, in a plan view of the flange portion 15 shown in FIG. 3A, the flange portion 15 faces inward from the inside toward the outside at 60 ° with respect to the rotation direction when the cap 2 is screwed. The spout stopper 1 according to the modified example 1 in which the rib 181 extending with an inclination was formed was prepared.

(Comparative example)
As a comparative example, a spout stopper in which the recess 17 and the rib 18 were not formed in the spout stopper 1 was prepared.

  The ultrasonic energy and amplitude (ratio to predetermined amplitude) necessary for appropriate ultrasonic welding of the spout stoppers according to Examples 1 and 2 and the comparative example, the air pressure applied to the ultrasonic horn, and the time were determined. As shown in Table 1, compared with the comparative example, in Examples 1 and 2, the energy and amplitude of ultrasonic waves required for welding could be kept low. In Examples 1 and 2, it was confirmed that the spout stopper after welding was not damaged by ultrasonic vibration. It was also confirmed that the above-described separation can be easily performed.

  As described above, according to the present invention, there is provided a spout stopper that has sufficient rigidity, is not damaged by ultrasonic vibration during welding, and can be easily separated when the packaging container is disassembled. The used packaging container can be provided.

  The present invention is useful for a paper packaging container or the like that contains a liquid or the like.

DESCRIPTION OF SYMBOLS 1 Outlet plug 2 Cap 3 Packaging container 11 Side wall 12 External screw 13 Pull ring 14 Bulkhead 16 Half cut 15 Flange part 17 Recessed part 18, 181 and 182 Rib 19 Protrusion part 20 Bottom face 21 Outer peripheral surface 22 Planned part 23 Rib top face 100 Container body 101 Top portion 102 Body portion 103 Bottom portion 105 Fragile portion 106, 106a, 106b Roof plate 107 Folding plate 108 Folding plate 110 Blank 111 Side plate 112 Bottom plate 113 Seal portion 114 Outlet hole 200 Sheet material 201 Thermoplastic resin layer 202 Paper Base material layer 203 Adhesive resin layer 204 Barrier layer 204a Base film 204b Deposition layer 204c Metal foil 205 Adhesive layer 206 Sealant layer 207a, 207b Scratched part 208 Print layer

Claims (9)

A cylindrical side wall;
A spout stopper provided with a disc-shaped flange portion provided so as to extend outward from one end edge of the side wall,
A spout stopper, wherein a plurality of concave portions partitioned by a plurality of ribs are annularly arranged on a bottom surface, which is a surface opposite to the side wall of the flange portion, to form a planned cutting portion.   The spout stopper according to claim 1, wherein the plurality of ribs are formed so as to extend radially from the center of the cylindrical side wall in a plan view of the flange portion. A thread for screwing a cap is formed on the outer peripheral surface of the side wall,
The plurality of ribs have an inclination of a first predetermined angle that is less than a right angle with respect to a rotation direction when the cap is screwed inwardly from the inside of the flange portion in a plan view of the flange portion. The spout stopper according to claim 1, wherein the spout stopper is formed to extend.   As the plurality of ribs, in a plan view of the flange portion, the flange portion has an inclination of a second predetermined angle with respect to the reverse direction of the rotation direction when the cap is screwed from the inside to the outside of the flange portion. The spout stopper according to claim 3, further comprising a plurality of extending ribs.   The spout stopper according to claim 3 or 4, wherein the first predetermined angle is 60 °.   The spout tap according to claim 4, wherein the second predetermined angle is 60 °.   The spout stopper according to any one of claims 1 to 6, wherein top surfaces of the plurality of ribs are included in the same plane as the bottom surface of the flange portion.   When the thickness of the portion of the flange portion where the concave portion is formed is d1, the distance between the concave portions is separated by the ribs, and the width of the concave portion is d3, d2 ≦ The spout stopper according to claim 1, wherein d1 ≦ d3 is satisfied. The sheet material is bent into a box shape, the end portions are overlapped and sealed, and formed into a container body provided with a pouring hole, and attached to the pouring hole. A packaging container comprising a spout stopper of
In the container body, a linear fragile portion is formed,
A broken line formed by bending the container body along the fragile portion passes through the pouring hole.