TWI661983B - Injection hole plug and packaging container - Google Patents

Abstract

Provided is an injection hole plug which has sufficient rigidity and 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 injection hole plug.

The injection hole plug includes a cylindrical side wall and a disc-shaped flange portion provided to extend outward from one end edge of the side wall. The flange portion is formed with a recessed portion arranged in a ring shape, and the recessed portion is a planned disconnection portion; and a rib provided in the annular protruding portion or the planned disconnection portion.

Description

Injection hole plug and packaging container

The present invention relates to an injection hole plug and a packaging container using the same.

A sheet is prepared by laminating a barrier layer such as an aluminum foil, an aluminum vapor-deposited film, or an inorganic oxide vapor-deposited film between a paper substrate layer and a thermoplastic resin sealing layer (see Patent Document 1), and This sheet is bent into a box shape, and its ends are overlapped and sealed to form a container body, and a packaging container provided with an injection hole plug as shown in FIG. 25 on such a container body is well known. Such packaging containers have been widely used for containers containing liquid beverages such as fruit juice drinks, fruit juices, teas, coffee, dairy drinks, soups, alcoholic beverages such as Japanese sake and distilled spirits.

This type of packaging container comes in a variety of forms, one of which is to install a lid such as polyethylene and a plug hole plug on the gable top (gable top) top plate, so that the contents can be poured and poured. Packaging containers are well known. For environmental protection, separate collection of empty containers after use, and volume reduction of waste, it is better to separate the container body made of paper sheet and the injection hole plug welded to the container body when discarding it. The separation method is to open the top seal of the box, and then cut the sheet around the injection plug with scissors or the like. However, this packaging capacity Disassembly of the container is not easy because of the strong welding of the closed part on the top of the box, and because it is troublesome to cut with scissors, etc., the injection hole plug is not separated from the container body in most cases, Is discarded directly.

Therefore, there has been developed a liquid paper container that facilitates separation of the injection hole plug from the container body. Patent Document 2 discloses a paper packaging body in which a ring-shaped thin-walled portion is formed on an inner peripheral side of a ring-shaped body (flange portion) mounted on a paper container formed with a bending guide line. Plugs. According to the paper packaging body, by bending the paper packaging body along the bending guide line, the ring-shaped thin-walled portion is cracked, and the cylindrical body injecting the plug can be separated from the paper container.

Patent Literature 3 discloses a hole plug, which is a hole plug composed of an injection hole plug and a lid, and which extends from the lower end portion of the outer side of the side wall serving as the injection passage of the injection hole plug to the inside of the flange portion. A crackable thin wall portion is formed on the upper surface of the peripheral side, and the upper surface of the thinner wall portion on the radially outer side is adhered and fixed to the opening peripheral edge of the liquid paper container. The flange portion can be completely separated from the side wall.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2003-335362

[Patent Document 2] Japanese Patent No. 5649421

[Patent Document 3] Japanese Patent Laid-Open No. 2011-73748

However, if a thin-walled portion is formed in the injection hole plug as in Patent Documents 2 and 3, the rigidity of the flange portion of the injection hole plug is reduced. Therefore, when ultrasonic welding is used for paper container welding, the thin-walled portion and its vicinity are deformed due to ultrasonic vibration, deformation of the cylindrical body is raised from the flange portion, or pinholes are formed in the thin-walled portion. There is a risk of cracking, or failure to crack after welding, and proper welding may not be performed.

In the case where the plug is ejected, even if the shape of the horn or the intensity of the ultrasonic wave on the side of the ultrasonic sealing machine is adjusted, there is still a limit to properly welding the container body stably. Traditionally, in order to prevent the seal from being uneven, the ultrasonic energy is strengthened. However, the flange portion of the plug may be deformed, and a seal leakage may occur.

The present invention has been developed in view of such a problem, and its object is to provide a plug with a sufficient rigidity, but not damaged by ultrasonic vibration during welding, and easily separated when the packaging container is disassembled And a packaging container using the injection hole plug.

In order to solve the above-mentioned problem, one aspect of the present invention is to provide an injection hole plug including: a cylindrical side wall; and a disc-shaped flange portion provided to extend outward from one end edge of the sidewall; and the flange portion A plurality of recessed portions separated by a plurality of ribs are arranged in a ring-shaped predetermined disconnection portion.

Another aspect of the present invention is to provide an injection hole plug, comprising: a cylindrical side wall; and a disc-shaped flange portion provided to extend outward from one end edge of the sidewall; It belongs to the bottom surface of the side opposite to the side wall of the flange portion, from the annular groove portion and from The outer side has one or more annular protrusions at a predetermined distance.

In addition, another aspect of the present invention is to provide a packaging container comprising: a container body, which is formed into a box shape by bending a sheet material, and has an injection hole; and the injection hole plug, wherein the flange portion is welded to the material, and Installed in the injection hole.

According to the present invention, it is possible to provide an injection hole plug having sufficient rigidity, which is not damaged even by ultrasonic vibration during welding, and a packaging container using the injection hole plug when the packaging container is disassembled.

1‧‧‧Injection hole plug

2‧‧‧ lid

3‧‧‧packing container

11‧‧‧ sidewall

12‧‧‧ male thread

13‧‧‧ Griphook

14‧‧‧ divider

15‧‧‧ protruding edge

16‧‧‧ Half cut groove

17‧‧‧ recess

18, 181, 182‧‧‧ ribs

19‧‧‧ protrusion

20‧‧‧ underside

21‧‧‧outer surface

22‧‧‧ Disconnect scheduled department

23‧‧‧ rib top

100‧‧‧ container body

101‧‧‧Top of the box

102‧‧‧Torso

103‧‧‧ bottom

105‧‧‧ weakened

106, 106a, 106b ‧‧‧ Top plate

107‧‧‧ folding board

108‧‧‧Return Folding Plate

110‧‧‧ vegetarian plate

111‧‧‧Side Panel

112‧‧‧ bottom panel

113‧‧‧sealing department

114‧‧‧ injection hole

200‧‧‧ Sheet

201‧‧‧ thermoplastic resin layer

202‧‧‧paper substrate layer

203‧‧‧adhesive resin layer

204‧‧‧ barrier layer

204a‧‧‧ substrate film

204b‧‧‧Evaporation coating

204c‧‧‧metal foil

205‧‧‧Adhesive layer

206‧‧‧Sealing layer

207a, 207b‧‧‧Notch processing department

208‧‧‧print layer

4‧‧‧Injection hole plug

5‧‧‧ lid

6‧‧‧packing container

31‧‧‧ sidewall

32‧‧‧ male thread

33‧‧‧ Griphook

34‧‧‧ divider

35‧‧‧burst

36‧‧‧ Half cut groove

37‧‧‧ recess

38‧‧‧ rib

39‧‧‧ protrusion

40‧‧‧ underside

41‧‧‧outer surface

42‧‧‧ Disconnect Schedule

43‧‧‧ rib top

44‧‧‧ the first wall surface of the recess

45‧‧‧ the second wall surface of the recess

46‧‧‧ Top surface of recess

47‧‧‧ Arc Corner

120‧‧‧ container body

121‧‧‧Top of the box

122‧‧‧Torso

123‧‧‧ bottom

126, 126a, 126b

127‧‧‧ folding board

128‧‧‧Return Folding Plate

130‧‧‧ vegetarian plate

131‧‧‧Side panel

132‧‧‧ bottom panel

133‧‧‧sealing department

134‧‧‧Injection hole

209‧‧‧ Ultrasonic Welding Head

800‧‧‧ bend line

81‧‧‧packing container

810‧‧‧upper

811‧‧‧ annular recess

8111‧‧‧ Outer annular recess

81110‧‧‧ Outer ring rib

8112‧‧‧Inner annular recess

81120‧‧‧Inner ring rib

814‧‧‧Upper inclined surface

815‧‧‧inclined surface

82‧‧‧ sidewall

821‧‧‧Male Thread

822‧‧‧Front side

824‧‧‧ dorsal view

83‧‧‧ cans

830‧‧‧ line of weakening

831‧‧‧closed plate

8311 ‧ ‧ ‧ ring

8312‧‧‧column

84‧‧‧base

841‧‧‧ standing wall

842‧‧‧ Depression in the base

85‧‧‧ annular recess (welding side)

851‧‧‧ outside annular recess (welding side)

852‧‧‧Inside annular recess (welding side)

853‧‧‧ rib (welding side)

86‧‧‧ opening

87‧‧‧Injection

871‧‧‧burst

88‧‧‧ Cover

900‧‧‧ Conce

902‧‧‧ container body

91‧‧‧Injection

911‧‧‧ side wall

912‧‧‧burst

913‧‧‧Circular groove

914‧‧‧ annular protrusion

92‧‧‧ Cover

FIG. 1 is a perspective view of a packaging container according to a first embodiment of the present invention.

Fig. 2A is a cross-sectional view of the injection hole plug according to the first embodiment of the present invention.

Fig. 2B is a plan view of the injection hole plug according to the first embodiment of the present invention.

Fig. 3A is a plan view of an injection hole plug according to a modification of the first embodiment of the present invention.

Fig. 3B is a plan view of an injection hole plug according to a modification of the first embodiment of the present invention.

Fig. 4 is a plan view of a blank plate according to the first embodiment of the present invention.

5A is a schematic cross-sectional view of a laminated structure of a sheet material according to the first embodiment of the present invention.

5B is a schematic sectional view of a laminated structure of a sheet material according to the first embodiment of the present invention.

FIG. 6A is a diagram showing a method for separating a pouring hole plug according to the first embodiment of the present invention. FIG.

FIG. 6B is a diagram showing a method for separating a pouring hole plug according to the first embodiment of the present invention. FIG.

FIG. 6C is a diagram showing a method for separating a pouring hole plug according to the first embodiment of the present invention. FIG.

Fig. 7 is a perspective view of a packaging container according to a second embodiment of the present invention.

8 is a plan view of a plain plate used in a packaging container according to a second embodiment of the present invention.

9A is a cross-sectional view of an injection hole plug used in a packaging container according to a second embodiment of the present invention.

Fig. 9B is a plan view of an injection hole plug used in a packaging container according to a second embodiment of the present invention.

FIG. 10A is an enlarged cross-sectional view of the periphery of the flange portion in a state where the injection hole plug ultrasonically welded to the container body according to the second embodiment of the present invention.

FIG. 10B is an enlarged cross-sectional view of the periphery of the flange portion in a state where the injection hole plug according to the comparative example of the second embodiment of the present invention is ultrasonically welded to the container body. FIG.

FIG. 11A is a view showing a method for separating a plug hole according to a second embodiment of the present invention. FIG.

FIG. 11B is a view showing a method for separating a plug hole according to a second embodiment of the present invention. FIG.

Fig. 12 is a sectional view and a bottom view of an injection hole plug according to a third embodiment of the present invention.

13A is a perspective view of a container according to a third embodiment of the present invention.

13B is a perspective view of a container according to a third embodiment of the present invention.

Fig. 14 is a developed view of a container body according to a third embodiment of the present invention.

FIG. 15A is a perspective view of a step of separating the injection hole plug from the container according to the third embodiment of the present invention. FIG.

Fig. 15B is a perspective view of a step of separating the injection hole plug from the container according to the third embodiment of the present invention.

FIG. 16A is a perspective view of another method of separating the injection hole plug from the container according to the third embodiment of the present invention. FIG.

FIG. 16B is a perspective view of another method of separating the injection hole plug from the container according to the third embodiment of the present invention.

FIG. 17A is a perspective view of a flat top surface type paper container according to a third embodiment of the present invention. FIG.

Fig. 17B is a perspective view of a flat top surface type paper container according to a third embodiment of the present invention.

18 is a cross-sectional view and a plan view of a modified example of the injection hole plug according to the third embodiment of the present invention.

19 is a cross-sectional view and a plan view of a modified example of the injection hole plug according to the third embodiment of the present invention.

20 is a cross-sectional view and a plan view of an injection hole plug according to an embodiment of the present invention.

Fig. 21 is a schematic explanatory view of a pouring hole plug and a lid according to a fourth embodiment of the present invention.

Fig. 22 is a schematic explanatory view of a packaging container according to a fourth embodiment of the present invention.

FIG. 23 is a schematic explanatory view of a cross section of a flange portion of an injection hole plug according to a fourth embodiment of the present invention. FIG.

FIG. 24 is a schematic explanatory view of a cross section of a flange portion of an injection hole plug according to a fourth embodiment of the present invention. FIG.

Fig. 25 is a sectional view and a plan view of a conventional injection hole plug.

[Form of Implementing Invention]

(First Embodiment)

With reference to the drawings, the injection hole plug 1 and the packaging container 3 according to the first embodiment of the present invention will be described.

<Packing container>

FIG. 1 is a perspective view of a packaging container 3. The packaging container 3 includes a container body 100 and an injection hole plug 1. The container body 100 is formed by folding a blank 110 obtained by processing a sheet material 200 described later into a box shape, and overlapping and sealing the ends. The injection hole plug 1 includes a cover 2 as an example. The container body 100 includes a box top portion 101 as an upper portion, a trunk portion 102 as a side surface, and a bottom portion 103 as a lower portion when standing. The box top 101 includes two top plates 106 (106a, 106b), a folding plate 107 folded between the top plates 106, and a return plate 108. The top plate 106 a is formed with a circular injection hole 114. The injection hole plug 1 is attached to the injection hole 114. The box top 101 is formed with a weakened portion 105 as an example. The weakened portion 105 weakens the cracking strength in the width direction belonging to the left-right direction when the container body 100 is erected.

<Injection hole plug>

2A and 2B are plan views when viewed from below the sectional view of the injection hole plug 1. The injection hole plug 1 includes a cylindrical side wall 11, a partition plate 14 that seals the inside of the side wall 11, a disk-shaped flange portion 15, and a plurality of concave portions formed on the bottom surface 20 of the flange portion 15. 17. The injection hole plug 1 can be made by low-density polyethylene (LDPE) or the like by integral molding. In order to facilitate separation, the material of the injection hole plug 1 is preferably a flexural modulus of 100 MPa to 180 MPa, and particularly preferably 120 MPa to 155 MPa.

The side wall 11 is formed on the outer peripheral surface 21 with a male screw 12 for screwing a lid, and the lid 2 with a screw on the inner peripheral surface can be screwed onto the male screw from above. In addition, on the outer peripheral surface 21 of the side wall 11 and below the male screw 12, three protrusions 19 protruding outward are formed so as to divide the circumference equally. Further, a disc-shaped flange portion 15 is provided extending from below the protruding portion 19 and outward from the outer peripheral surface 21 of the side wall 11. The surface of the flange portion 15 on the side wall 11 is attached to the container body 100 by ultrasonic welding. The container body 100 is sandwiched between the protruding portion 19 and the flange portion 15.

As shown in FIG. 2B, a cut-off portion 22 is formed on the surface of the flange portion 15 on the side opposite to the side wall 11 side, that is, the bottom surface 20, and the cut-off portion is formed by a plurality of recesses separated by a plurality of ribs 18. 17 is arranged in a ring shape. The recessed portion 17 is a groove formed on the bottom surface 20 of the flange portion 15 and having a trapezoidal cross section. This cross-sectional shape may take various shapes other than a trapezoid. In addition, protrusions of various shapes may be formed on each surface of the flange portion 15 and are used as an energy indicator for controlling the degree of concentration of ultrasonic energy and improving the fusion property during ultrasonic welding.

The plurality of ribs 18 extend radially from the center of the side wall 11 in a plan view of the flange portion 15 and are provided at 24 locations in a manner of equally dividing the circumference. As shown in FIG. 2A, the top surface 23 of the rib 18 is formed 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 located at a position recessed from the bottom surface 20 of the flange portion 15.

The partition plate 14 is formed near the lower end of the side wall 11 to partition the upper end side and the lower end side of the inside of the side wall 11. The partition plate 14 is connected to the side wall 11 by forming a ring-shaped half cut groove 16 by reducing the thickness of the outer peripheral wall. A pull ring 13 is connected to the upper surface of the partition plate 14 via a pillar. user When the pull ring 13 is pulled upward, the partition plate 14 cracked along the half cut groove 16 can be pulled away from the side wall 11 so that the upper end side and the lower end side of the side wall 11 communicate with each other, and the packaging container 3 is opened.

By appropriately setting the number of ribs 18, the thickness (d1) of the portion where the flange portion 15 is formed with the recess, the distance (d2) between the recesses 17 separated by each of the plurality of ribs 18, and the width (d3) of the recesses 17 ), It is possible to facilitate the separation of the flange portion 15 from the side wall 11 with the planned disconnection portion 22 as a boundary, improve rigidity, and prevent damage due to ultrasonic vibration. For example, if the number of transmission ribs 18 is set to a range of 24 to 48, and d1 and d2 are set to 0.15 mm to 0.3 mm, especially 0.2 mm to 0.25 mm, it is possible to prevent ultrasonic vibration caused by welding. The breakage makes it easy to separate the flange portion 15 and the side wall 11 with the planned break portion 22 as a boundary. In addition, for example, if the relationship between d1 and d3 is set to d2 ≦ d1, the breaking action during separation can be performed in the order of d2 and d1, and the separation can be made smoother. In addition, for example, if d1 ≦ d3 is set, it is possible to obtain proper bending or stretching in the vicinity of the planned disconnection portion 22 for smoother separation.

<Modification 1 of the injection hole plug>

The ribs 18 can take various forms. 3A and 3B are plan views of a modification of the injection hole plug 1 in which the shape of the rib 18 is changed when viewed from the bottom surface 20 side. The plurality of ribs 181 of the injection hole plug shown in FIG. 3A are formed in a plan view of the flange portion 15 from the inside of the flange portion 15 to the outside, so that the rotation direction when the cap 2 is screwed on (note In the case of the exit plug 1, the first predetermined angle that does not reach a right angle is extended obliquely when viewed from the bottom surface 20 side. The first predetermined angle is, for example, 60 °. Through the ribs 181 The inclination is set to less than a right angle, which can increase the rigidity of the flange portion 15 relative to the torque in the locking direction of the lid 2 and prevent the flange portion 15 from being damaged during the capping step.

<Modification 2 of the injection hole plug>

The injection hole plug shown in FIG. 3B is provided in addition to the ribs 181 to form a plurality of ribs 182. In a plan view of the flange portion 15, the plurality of ribs 182 extend from the inside to the outside of the flange portion 15, and are configured to be inclined at a second predetermined angle that is less than a right angle to the direction opposite to the rotation direction when the screw cap 2 is mounted. . The second predetermined angle is, for example, 60 °. With this design, since the ribs 182 form a honeycomb structure in which the triangular recesses 17 are arranged in a circular shape, the rigidity of the flange portion 15 with respect to the load from each direction parallel to the plane including the flange portion 15 is improved.

<Plain plate>

FIG. 4 is a plan view of a plain plate 110, which is an example of a plate used as a material of the container body 100. The plain plate 110 has: the top plates 106a, 106b, the folding plate 107, and the return plate 108 constituting the box top 101; the four side plates 111 constituting the trunk portion 102; the bottom plate 112 constituting the bottom portion 103; and the end portion的 封 部 113。 The sealing portion 113. The plain plate 110 can be formed into a box shape by bending the plain plate 110 along a one-point chain line shown in FIG. 4 and sealing the sealing portion 113 at the opposite end. An injection hole 114 is formed near the center of the top plate 106a, and the injection hole plug 1 is inserted and fixed. The top plates 106a, 106b, the folding plate 107, and the folding plate 108 cover the container body 100 in the width direction belonging to the left-right direction when the container body 100 is erected to form a linear weakening portion 105 over substantially the entire periphery. A part of the weakened portion 105 is cut off by the injection hole 114. That is, the container body 100 is generated by bending the container body 100 along the weakened portion 105. The polyline will pass through the injection hole 114. The weakened portion 105 may be formed to cover the vertical direction of the container body 100 as long as it can be partially broken by the injection hole 114.

<Sheet>

5A and 5B are cross-sectional views schematically showing two laminated structure examples of the sheet 200 used for the plain plate 110. The sheet 200 has the printing layer 208 / thermoplastic resin layer 201 / paper substrate layer 202 / adhesive resin layer 203 / barrier layer 204 / adhesive layer 205 / sealing layer 206 in order from the outside to the inside of the packaging container 3. .

As shown in FIGS. 5A and 5B, the sheet 200 is formed with a weakened portion 105. The weakened portion 105 is formed of groove-shaped cutout portions 207 a and 207 b formed at least in a predetermined depth in the paper base material layer 202 and the barrier layer 204. The cutout portion 207b of the barrier layer 204 is preferably formed so as to overlap the cutout portion 207a of the paper base material layer 202 in a plan view. Although the notch processing portion 207b is preferably formed at a depth that does not penetrate the barrier layer 204, it has a small influence on the barrier properties even if it penetrates in a narrow range, so it can penetrate the barrier layer 204 locally. In addition, the notch processing portion 207a may be formed at least on the paper base material layer 202. Therefore, as shown in FIG. 5A and FIG. The plastic resin layer 201 and the printing layer 208.

The formation depth of the notch processing portion 207 a may be a depth within a range in which the strength of the packaging substrate 3 is ensured by the paper base material layer 202. The notch processing portion 207a may be formed by a half removal process or a full removal process using a die. In order to ensure the strength of the packaging container 3, these notches can be formed into a riding stitch shape. If the barrier layer 204 is bonded, the notch processing portion 207b It can be formed by laser light processing, but when it is formed before the barrier layer 204 is bonded, a semi-removal process or a full-removal process can be performed using a die. In the case where the notch processing portion 207b is provided before the barrier layer 204 is bonded, it may be formed by laser processing. The notch processing portion 207b may be formed in a saddle shape to ensure strength.

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

A printing layer 208 may also be provided on the outside of the thermoplastic resin layer 201 to display patterns or product information. The printing layer 208 can be formed by a known method such as gravure printing or lithographic printing. The thermoplastic resin layer 201 may also be subjected to an easy-adhesion treatment such as a corona treatment to improve the adhesion with the printed layer 208. An overcoat layer may also be provided on the outer side of the printing layer to improve wear resistance or surface decoration.

As the paper base layer 202, a cardboard such as milk carton base paper can be used. Its basis weight and density can be appropriately selected according to the capacity or design of the container.

The adhesive resin layer 203 is a layer composed of a polyolefin-based resin having the functions of an adhesive paper base layer 202 and a 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), and ionomer can be used. , Polypropylene (PP), etc. In order to improve 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 such as a dry laminated adhesive may be used instead of the adhesive Connected with resin layer.

As the barrier layer 204, a vapor-deposited film including a metal such as aluminum, a silicon oxide, an aluminum oxide, etc., and a base film 204a can be used, or a metal layer 204 such as aluminum can be dry-laminated on the base film 204a. film. In the example shown in FIG. 5A, the barrier layer 204 is a vapor-deposited film, and includes a base film 204 a and a vapor-deposited layer 204 b provided on the inner surface of the packaging container 3. In the example shown in FIG. 5B, the barrier layer 204 is a laminated film, and is composed of a base film 204 a and a metal foil 204 c provided on the outer surface of the packaging container 3. In addition, when a laminated film is used and the notch processed portion 207b is formed by laser light irradiation, as shown in FIG. 5A, in order not to shield the metal foil 204c from the laser light irradiated to the base film 204a, the barrier layer 204 is an evaporation layer 204b Alternatively, the metal foil 204c is laminated so as to face the adhesive resin layer 203. In addition, a barrier coating type 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 also be used as a barrier. Layer 204.

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

The adhesive layer 205 may be adhered by a dry laminating adhesive or a solventless laminating adhesive, or a polyolefin resin by extrusion processing.

The sealing layer 206 can use HDPE, MDPE, LDPE, LLDPE, or the like. Moreover, it may be a layer containing a part of polybutene. Among the above materials, LLDPE is particularly suitable. The sealing layer 206 is preferably an unstretched film formed by a T-die method or an inflation method. In addition, sheet 200 The layer structure and the aspect of the weakened portion 105 can be implemented in many aspects, and is not limited to the examples described above.

To weld the injection hole plug 1 ultrasonically to the container body 100, first insert the side wall 11 of the injection hole plug 1 into the injection hole 114 of the container body 100 from the inner side, so that the flange portion 15 is formed with the side wall 11 The surface is abutted against the inner surface of the top plate 106a. At this time, as shown in FIG. 1, the peripheral portion of the injection hole 114 of the container body 100 is sandwiched between the protruding portion 19 and the flange portion 15, and the injection hole plug 1 is temporarily fixed to the container body 100. Then, an anvil and an ultrasonic horn (both not shown) inserted into the inside (inside) of the container body 100 are abutted on the top plate 106a overlapping the flange portion 15 to cause ultrasonic vibration. To weld the top plate 106 and the flange portion 15. Although the vibration generated at this time causes the flange portion 15 to vibrate, the vibration is absorbed by the ribs 18, so that damage to the periphery of the recessed portion 17 can be prevented. Furthermore, by forming the ribs 18, the rigidity of the flange portion 15 is improved. Therefore, it is possible to make close contact with the top plate 106 while the shape of the flange portion 15 is kept stable during welding. As a result, occurrence of welding unevenness can be prevented.

<Separation method>

The separation method of the injection hole plug 1 will be described below. FIG. 6A, FIG. 6B, and FIG. 6C show the steps involved in the method for separating the plug 1.

<< Squash step >>

FIG. 6A is a step of flattening the packaging container 3. In this step, the user of the packaging container 3 can squash the torso portion 102 by squeezing the two side panels 111 extending downward and facing each other in a direction of contact with each other. The two side panels 111 connected to the crushed side panel 111 are folded toward the inside of the packaging container 3.

<< Bending steps >>

FIG. 6B discloses a step of bending the packaging container 3 along the weakened portion 105. In this step, as shown in FIG. 6B, the user can bend the top plate 106 along the weakened portion 105. At this time, the fold line formed in the top plate 106 passes through the injection hole 114.

Since the fold line formed in the top plate 106 passes through the injection hole 114, a part of the flange portion 15 of the injection hole plug 1 attached to the injection hole 114 is also loaded and bent in the same direction as the top plate 106. Here, since the ejection hole plug 1 is formed with a planned disconnection portion 22, the periphery of the ejection hole plug 1 may be cracked at least locally as shown in the cross-sectional view on the right side of FIG. 6B.

<< Injection hole plug separation step >>

FIG. 6C discloses a step of separating the injection hole plug 1 from the packaging container 3. Since cracks have occurred around the recess 17 of the injection hole plug 1 in the previous step, the user can use this as a starting point to break the injection hole plug 1 along the planned disconnection portion 22 with a little force, so that The portion containing the side wall 11 is separated from the packaging container 3.

As described above, according to this embodiment, it is possible to provide an injection hole plug having sufficient rigidity, which is not damaged by ultrasonic vibration during welding, and which can be easily separated when the packaging container is disassembled, and packaging using the injection hole plug container.

Next, a second embodiment of the present invention will be described.

<Packing container>

FIG. 7 is a perspective view showing the packaging container 6. The packaging container 6 includes a container body 120 and an injection hole plug 4. The container body 120 is formed by folding a plain plate 130 obtained by processing a sheet material described later into a box shape, and overlapping and sealing the ends. In one example, the injection hole plug 4 includes a cover 5. Container body 120 It includes a box top portion 121 which becomes an upper portion when standing, a trunk portion 122 which becomes a side portion, and a bottom portion 123 which becomes a lower portion. The box top 121 includes: two top plates 126 (126a, 126b), a folding plate 127 folded between the top plates 126, and a return plate 128. The top plate 126a is formed with a circular injection hole 134. The injection hole plug 4 is installed in the injection hole 134.

<Plain plate>

FIG. 8 is a plan view of the plain plate 130, and the plain plate 130 is an example of the material of the container body 120. The plain plate 130 includes a top plate (126a, 126b) constituting the top 121 of the box, a folding plate 127 and a folding plate 128, four side panels 131 constituting the trunk portion 122, a bottom panel 132 constituting the bottom portion 123, and an end portion部 的 封 合 部 133. The plain plate 130 can be formed into a box shape by bending the plain plate 130 in accordance with the one-point chain line shown in FIG. 8 and sealing the sealing portion 133 at the opposite end. An injection hole 134 is formed near the center of the top plate 126a to insert and fix the injection hole plug 4.

<Sheet>

The sheet material has, for example, a printing layer / thermoplastic resin layer / paper base material layer / adhesive resin layer / barrier layer / adhesive layer / seal layer in order from the outside to the inside of the packaging container 6, which can be used and implemented in the first embodiment. Materials with the same layer structure.

<Injection hole plug>

9A and 9B are a cross-sectional view of the injection hole plug 4 and a plan view viewed from below. The injection hole plug 4 includes a cylindrical side wall 31, a partition plate 34 that seals the inside of the side wall 31, a disc-shaped flange portion 35 provided to extend outward from one end edge of the side wall 31, and A plurality of recesses 37 on the bottom surface 40 of the flange portion 35. Note that the plug 4 can be borrowed from LDPE, LLDPF, etc. Formed.

The side wall 31 is formed on the outer peripheral surface 41 with a male screw 32 for a screw-on cap, and the cap 5 formed with a screw on an inner peripheral surface can be screwed onto the male screw from above. In addition, on the outer peripheral surface 41 of the side wall 31 and below the male screw 32, three protrusions 39 protruding outward are formed so as to divide the circumference equally. Furthermore, a disc-shaped flange portion 35 is provided below the protruding portion 39 and extends outward from the outer peripheral surface 41 of the side wall 31. The surface of the flange portion 35 on the side of the side wall 31 is attached to the container body 120 by ultrasonic welding. The protruding portion 39 sandwiches the container body 120 between the container body 120 and the flange portion 35.

As shown in FIGS. 9A and 9B, the bottom surface 40 of the flange portion 35, which is the surface opposite to the side wall 31, is formed with a planned cut-out portion 42. The recessed portion 37 separated by a plurality of ribs 38 is arranged in the planned cut-out portion 42. Into a ring. The recessed portion 37 includes a first wall surface 44 formed concentrically with the side wall 31, a second wall surface 45 formed concentrically with the side wall 31 and formed on the outer periphery of the first wall surface 44, and a first wall surface 44 and a second wall surface 45 connecting the first wall surface 44 and the second wall surface 45. Top surface 46. The top surface 46 is connected to the first wall surface 44 and the second wall surface 45 at a predetermined angle, respectively. The bottom surface 40 and the first wall surface 44 and the second wall surface 45 are preferably connected by arc-shaped corner portions 47 each having a chamfered arc surface. If the first wall surface 44 and the second wall surface 45 and the bottom surface 40 are not provided with an arc-shaped corner portion 47 and are formed into an edge shape, for example, the ultrasonic wave is easily transmitted to the flange portion 35 during ultrasonic welding. The sound wave vibrates to cause a phenomenon in which the concave portion 37 is bent and collapsed in the left-right direction of the paper surface in FIG. 9A. As a result, the material forming the flange portion 35 around the concave portion 37 will be pushed out of the surface of the flange portion 35, causing deformation such as protruding fat, and there is a concern that the protruding fat is separated from the protruding portion 35 into a foreign body. Furthermore, protrusions of various shapes may be formed on each surface of the flange portion 35, and may be used for ultrasonic welding. An energy indicator that controls the concentration of ultrasonic energy to improve weldability.

In a plan view of the flange portion 35, a plurality of ribs 38 extend from the center of the side wall 31 in a radial shape, and are provided at 15 locations in a manner of equally dividing the circumference. Although the bottom surface 43 of the rib 38 is formed on the same plane as the bottom surface 20 including the flange portion 35 as shown in FIG. 9A, the bottom surface 43 of the rib 38 may be located at a position recessed from the bottom surface 40 of the flange portion 35.

The partition plate 34 is formed near the lower end of the side wall 31 so as to partition the upper end side and the lower end side of the inside of the side wall 31. In addition, the partition plate 34 is connected to the side wall 31 via a ring-shaped half cut groove 36 formed by reducing the thickness of the outer peripheral wall. A pull ring 33 is connected to the upper surface of the partition plate 34 via a pillar. The user of the packaging container 6 can pull the pull ring 33 upward firmly, and pull the partition plate 34 cracked along the half cut groove 36 from the side wall 31, so that the upper end side and the lower end side of the side wall 31 are communicated, and the packaging container 6 is opened. .

By appropriately setting the number of the ribs 38, the wall thickness (d7) of the flange portion 35 on the top surface 46 of the concave portion 37, the circumferential width (d9) of the rib 38 in the plan view of the flange portion 35, and the radial direction of the concave portion 37 The width (d8) can facilitate the separation of the flange portion 35 and the side wall 31 bounded by the planned disconnection portion 42, increase rigidity, and prevent damage due to ultrasonic vibration.

The number of the ribs 38 can be appropriately adjusted according to the required cracking strength. Moreover, it is preferable to provide an odd number of ribs 38 equally for the reason of the following reason. As described later, when the user separates the injection hole plug 4 from the container body 120, the user bends the packaging container 6 along a line approximately passing the diameter of the injection hole plug 4. By setting the number of the ribs 38 to be an odd number, the ribs 38 belonging to the higher rigidity portion will not be located at both ends of the diameter of the injection hole plug 4 at the same time, which can prevent the separation of the injection hole plug 1 from becoming difficult.

d7 and d9 are preferably set at 0.15mm to 0.45mm. By setting d7 and d9 to 0.15mm or more, it is possible to prevent the situation where filling cannot be performed when using LDPE, LLDPE, and other integral molding. In addition, by setting d7 and d9 to 0.45 mm or less, damage to the periphery of the recessed portion 37 due to ultrasonic vibration can be prevented, and separation of the flange portion 35 and the side wall 31 bounded by the planned disconnection portion 42 can be facilitated. In addition, if d7 and d9 are made substantially equal, the load required for cracking the recessed portion 37 and the rib 38 when the scheduled disconnection portion 42 is cracked will be approximately equal, and the cracking and separation of the injection hole plug 4 can be smoothly performed with a certain force. When d7 and d9 are set at 0.2mm or more, the fear of poor filling during molding can be reduced. When set at 0.3mm or less, disconnection is easier and more ideal.

d8 is preferably set at 0.3 mm to 1.0 mm. By setting d8 to 0.3 mm or more, the strength of the mold for integrally forming the injection hole plug 4 can be ensured, and the durability of the mold can be obtained. In addition, by setting d8 to be 1.0 mm or less, the strength of the scheduled disconnection portion 42 can be ensured, and deformation of the injection hole plug 4 due to insufficient strength can be prevented from causing supply of the injection hole plug 4 to the capper or filler. bad. If d8 is set to 0.5 mm or more, the strength of the mold for molding can be sufficiently ensured. When d8 is set to 0.8 mm or less, the strength of the scheduled disconnection portion 42 is sufficiently ensured, which is more desirable.

<Injection hole>

In a state where the flange portion 35 is welded to the container body 100, the outer peripheral diameter d4 (diameter) of the inner peripheral surface portion facing the injection hole 134 through the side wall 31, the inner peripheral diameter d5 (diameter) of the injection hole 134, and the first The outer peripheral diameter d6 (diameter) of the connection portion between the wall surface 44 and the top surface 46 satisfies the following condition (Formula 1). For reasons described below, it is possible to prevent the flange portion from being caused by ultrasonic vibration during welding. 35 is bulged and deformed from the planned disconnection portion 42 toward the side wall 31.

d4 + d6 ≧ 2 × d5 (Eq. 1)

FIG. 10A is an enlarged cross-sectional view of the periphery of the flange portion 35, which shows a state in which the injection hole plug 4 is ultrasonically welded to the container body 120. FIG. FIG. 10A shows the welding state of the packaging container 6, and FIG. 10B shows the welding state when the injection hole plug that does not conform to (Expression 1) is used for comparison.

To weld the injection hole plug 1 ultrasonically to the container body 100, first insert the side wall 31 of the injection hole plug 4 into the injection hole 134 of the container body 120 from the inner side, and form the flange portion 35 with a side wall. The 31 surface abuts against the inner surface of the top plate 126a. Next, a welding anvil (not shown) is inserted into the inside (inside) of the container body 120 and abuts against the lower surface of the top plate 126a, and the ultrasonic welding head 209 is abutted against the upper plate 126a overlapping the flange portion 35. Ultrasonic vibration is generated, and the top plate 126 and the flange portion 15 are welded.

By setting d4, d5, and d6 to meet the relationship of (Equation 1), as long as the injection hole plug 4 is inserted into the injection hole 134, there will be no inner periphery of the injection hole 134 even if it is installed at any position. In the case where the diameter D2 is located on the outer peripheral side of the outer peripheral diameter D3 of the first wall surface 44, the sheet of the container body 120 covers the top surface 46 of the crimping recess 37, and the hole plug 4 is not injected even by ultrasonic vibration during welding Deformation can be obtained, and appropriate welding can be obtained. In addition, in the case of circulation and storage of the container after welding, the concave portion 37 can be protected by a sheet, and a packaging container 3 without accidental cracking can be obtained.

(Expression 1) is derived as follows. In a state where the injection hole plug 4 is inserted into the injection hole 134 and the flange portion 35 is in contact with the sheet, the distance (gap) between the inner peripheral surface of the injection hole 134 and the portion of the side wall 31 opposite thereto can be determined according to the injection Deviation between the central axis of the hole plug 4 and the central axis of the injection hole 134 The value is a value of 0 or more (d5-d4). (D5-d4), which is the maximum value of the gap, is less than the distance ((d6-d4) / 2) between the outer periphery of the side wall 31 and the outer periphery of the first wall surface 44, that is, (d5-d4) ≦ (d5- If the formula of d3) / 2 can be established, the sheet of the container body 120 can surely cover the top surface 46 of the recess 37. By transforming this formula, (Expression 1) can be obtained.

On the other hand, if the formula (1) is not satisfied, when the deviation between the central axis of the injection hole plug 1 and the central axis of the injection hole 134 is large, as shown by the dotted line in FIG. 10B, the sheet of the container body 120 cannot be covered and protected. Due to the ultrasonic vibration, the top surface 46 of the recessed portion 37 is deformed by the flange portion 35 rising in the direction of the side wall 31 starting from the recessed portion 37.

The injection hole plug of the present invention is not limited to the above-mentioned form. For example, the cross-sectional shape of the concave portion 37 can be variously modified.

<Separation method>

A method for separating the injection hole plug 4 will be described below. 11A and 11B show the steps involved in the method for separating the plug 4.

<< Squash step >>

FIG. 11A discloses a crushing step of the packaging container 6. In this step, the user of the packaging container 6 can press the trunk part 122 by pressing the two side panels 131 extending downward and facing each other in a direction of contact with each other. The two side panels 131 connected to the crushed side panel 131 are folded toward the inside of the packaging container 6.

<< Bending steps >>

FIG. 11B shows an example of a step of bending the packaging container 6. In this step, the user bends the roof root portion 126, the side panel 131, and the bottom panel 132 in the left-right direction, as shown in the left view of FIG. 11B, for example. at this time The polyline formed on the top plate 126 passes through the injection hole 134.

Since the fold line formed by this step passes through the injection hole 134, a part of the flange portion 35 of the injection hole plug 4 installed in the injection hole 134 is also loaded and bent in the same direction as the top plate 126. Here, since the cut-out portion 42 is formed in the injection hole plug 4, the periphery of the injection hole plug 4 is at least partially cracked.

<< Injection hole plug separation step >>

The right side view of FIG. 11B discloses the step of separating the injection hole plug 4 from the packaging container 6. Since the periphery of the recessed portion 37 of the injection hole plug 4 has been cracked in the previous step, the user can use this as a starting point to break the injection hole plug 4 along the planned disconnection portion 42 with a slight force, and the side wall 31 will be included. The portion is separated from the packaging container 6.

The above steps are only an example, and various modifications can still be made. For example, a weakening line that weakens the strength may be appropriately provided on the packaging container 6 and bent along this line. In addition, a step of separating the packaging container 6 into two or more along the weakening line or the like may be provided before or after the injection hole plug is separated.

(Third Embodiment)

Hereinafter, a third embodiment will be described in detail using the drawings. As shown in the sectional view on the upper side of FIG. 12, the configuration of the injection hole plug 87 of this embodiment welded to the container 1 includes a cylindrical side wall 82 and a disc-shaped flange extending outward from the vicinity of the lower end of the side wall. Department 871.

The outside of the side wall 82 is provided with a male thread 821 for screwing the cover 88, and the inside is provided with a closing plate 831 of a pulltop 83. The closing plate 831 is connected to the inside of the side wall through a weakening line 830, and the closing plate A pull ring 8311 connected to the closing plate 831 through a column 8312 is provided on the injection side of 831. The lower end of the side wall 82 includes a base 84, and the flange portion 871 expands horizontally outward from the lower end of the base 84, and is fused to the inside of the opening 86 of the paper container 1.

A plurality of annular recesses 811 are provided in a concentric circle shape on the bottom surface of the flange, which is on the opposite side of the sidewall of the flange portion 871. The top surface of the outer annular recessed part 8111 on the outer side is formed in an arch shape with a large radius of curvature R in the cross-sectional shape in the width direction. This design makes the outer ring-shaped recess 8111 difficult to crack due to vibration during ultrasonic welding. In addition, the outer ring-shaped recessed portion absorbs the ultrasonic vibration during welding, so that the ultrasonic vibration is not transmitted to the inner ring-shaped recessed portion, thereby preventing the damage of the inner ring-shaped recessed portion, and is responsible for melting the flesh when welding with the container. The role of absorption.

Further, a corner portion having a curvature radius of 0 or smaller than the curvature radius R in the cross-sectional shape in the width direction is provided on the top surface of the inner annular recessed portion 8112 on the inner side. The inner wall of the inner annular recessed portion 8112 is provided near the standing wall 841 of the base 84. That is, the inner side wall of the inner annular recessed portion 8112 may be provided in the vicinity of directly below the standing wall 841, or may be provided inward of the standing wall 841. When the injection hole plug 87 is welded to the container 81, the ultrasonic welding head at the time of ultrasonic welding is set to deviate directly above the inner annular recessed portion 8112, so that the annular recessed portion is not damaged by ultrasonic vibration. In this way, when the injection hole plug 87 is ruptured and broken, it is certainly broken from the corner corner of the recessed end of the inner annular recessed portion 8112. Basically, a horn that fuses the injection hole plug 87 and the container 81 with ultrasonic vibration is set to contact the outer annular recessed portion 8111 or deviate from the outer annular recessed portion 8112.

The lower side of FIG. 12 is a plan view viewed from the bottom surface side of the injection hole plug 87. The closed plate 831 of the can is located in the center, and the weakening line 830 and Side wall connection. A depression 842 of the base is provided near the lower end of the side wall or the base. The depressions are concave portions and are separated by ribs, but ribs may not be provided, and simple steps may be used. An inner annular recessed portion 8112 and an outer annular recessed portion 8111 are provided concentrically outside the base depression 842. For easy understanding, a part of it is shown in an enlarged view.

The outer annular recessed part 8111 and the inner annular recessed part 8112 are provided with a plurality of ribs, and the outer annular recessed part 8111 and the outer annular rib 81110 and the inner annular rib 8120 of the inner annular recessed part 8112 which are adjacent to each other are staggered and provided to each other different. That is, viewed from the center of the flange, these ribs are provided at positions different from each other. Therefore, it is preferable that the number of ribs of the annular recessed portion is the same as that of the outer ring rib 81110 and the inner ring rib 81120. In addition, in terms of the rib shape of the plurality of annular recessed portions, the thickness of the outer ring rib d11 of the outer annular recessed portion is greater than the thickness of the inner ring rib d10 of the inner annular recessed portion. This is to increase the strength of the flange at the outer annular concave portion, making it difficult to be damaged by ultrasonic vibration.

In addition, the flange thickness d12 at the outer annular recess and the flange thickness d13 at the inner annular recess are thinner than the inner ring rib thickness d10 of the inner annular recess, and are smaller than the ring width d14 of the inner annular recess. thin. The thicknesses d12 and d13 of the flanges at the annular recesses are set to be 0.2 mm or more and 0.3 mm or less. The reason is that if it is less than 0.2 mm, cracks may be generated when ultrasonic welding is performed with the container body, and if it is thicker than 0.3 mm, it is difficult to disconnect. Therefore, it is preferably 0.23 mm or more and 0.3 mm or less.

The width d15 of the outer annular recessed portion and the width d14 of the inner annular recessed portion are 0.3 mm or more, and preferably set to 0.5 mm or more. This is because when the diameter is less than 0.3 mm, the strength of the injection molding mold is lowered and the durability is lowered. Fear.

13A and 13B show a packaging container 81 to which an injection hole plug 87 is welded. FIG. 13A is a perspective view of the front side 822 side connected from the upper inclined surface 815 to which the injection hole plug is welded, and FIG. 13B is a perspective view of the back side 824 side. A bending line 800 is horizontally provided on the upper inclined surface 815 and the upper back inclined surface 814 to which the injection hole plug is fused, and the bending line 800 passes through the center of the opening portion 86 to which the injection hole plug 87 is fused.

FIG. 14 is a development view showing a plain plate for manufacturing a container 81 shown in FIGS. 13A and 13B. A bend line 800 passing through the center of the opening 86 passes through the entire upper surface constituting the upper portion 810.

FIG. 15A and FIG. 15B show the steps of removing the injection hole plug 87 after the paper container to which the injection hole plug 87 is welded according to the present invention shown in FIG. 13A, FIG. 13B, and FIG. 14 is poured out. FIG. 15A is a flattening step of folding the left and right side surfaces of the container 81 into the inside to flatten the paper container. In the next bending step, the force is applied by bending the flattened container according to the bending line 800 indicated by the dashed line shown by the arrow in FIG. 15A. Next, as shown in FIG. 15B, it is bent at the bending line 800, and the side wall 82 or the base 84 of the hole plug 87 is not bent, but is cracked at the inner annular recess 8112 of the flange. Although the cracked flange is cracked in the half separated by the bend line 800, the other inner ring-shaped recess 8112 forms a thin wall. The cracked half flange can be used as a starting point, and the hole plug base and the rest can be easily injected. Crack between the flanges and remove.

The example of the paper container of FIGS. 16A and 16B is also a step of removing the injection hole plug 87 after welding the paper container to which the injection hole plug 87 of the present invention is welded, and the bending line 800 extends in the vertical direction of the container. Figure 16A is The left and right sides of the paper container 81 are bent and folded into the inside, so that the paper container is flattened into a flattening step. In the next bending step, the flattened paper container is forced to bend at the longitudinal bending line 800 indicated by the dashed line as shown by the arrow in FIG. 16A. Next, as shown in FIG. 16B, a longitudinal bend is applied to the bend line 800, but the side wall 82 or the base 84 of the injection hole plug 87 is not bent, but cracks at the inner annular recessed portion 8112 of the flange. Although the left and right sides of the bend line 800 in this direction will be bent, but there is no plate on the left and right sides, and it is easy to bend, so it can be bent at this position with little force. Although the cracked flange is cracked in the half of the bend line 800 that is separated, the other inner ring-shaped recess 8112 will also form a thin wall. Therefore, the cracked half flange can be used as a starting point to easily inject the hole plug. Crack and remove between the base and the remaining flanges.

FIG. 17A and FIG. 17B are examples applied not to a gable top paper container, but to a flat top paper container. The flat top surface is a half of the top surface bent and welded. Although it is necessary to bend the top plate and then peel the injection hole plug 87 from the top, a corresponding injection hole plug can be used. In this case, it is not necessary to peel off the top, and the strength of the top plate is also very high, so as long as the side wall 82 of the injection hole plug is crushed, it can be cracked.

FIG. 18 is an example of an injection hole plug in which an annular recessed portion having a plurality of ribs is provided in a plurality of concentric circles on an upper surface welding region on a side wall side of a flange portion. The injection hole plug has a soft flange but can be welded, and has a ring-shaped recess 85 on the welding surface for welding, and the ring-shaped recess is separated by a plurality of ribs. In addition, among the plurality of ribs 853 included in the annular recessed portion, the rib positions of the inner annular recessed portion 852 adjacent to the inside and the outside and the outer position The rib positions of the side annular recessed portions 851 are formed so as to be shifted from each other. That is, from the center of the flange, these ribs are arranged at positions with different directions. The rib 853 of the annular recessed portion has a function of preventing the ultrasonic welding head from falling into the recessed portion. In addition, when the flanges of the container 81 and the injection hole plug 87 are welded by the ribs or recesses, the ultrasonic vibration can be evenly spread to the welding surface even if the delicate height adjustment usually required is not performed. Even welding. In addition, when welding is performed by this method, even if the pressing force, amplitude, and workload which are welding conditions are reduced, the welding properties are not significantly reduced, and stable welding can be performed. In addition, since the welding hole portion is not formed on the protruding energy indicator in the injection hole plug, there is no problem in that the injection hole plugs catch each other during transportation. Furthermore, even if a stopper is attached to the end of the base, there is an advantage that the problem that the opening of the paper container is constantly pushed up to the energy indicator does not occur.

Fig. 19 is an injection hole plug obtained by combining the characteristics of the injection hole plug shown in Figs. 12 and 18. The upper part of Fig. 19 is a sectional view, and the middle of Fig. 19 is viewed from the bottom side (the inside of the container). The bottom view of FIG. 19 is a plan view when viewed from the outside. This is an example in which a plurality of annular recesses are provided inside and outside the soft flange portion, and is a container having improved weldability and separability.

Note that the material of the hole plug 87 must be a material that has good weldability with the sealing layer used in the container body, high stress cracking resistance, and is not easily affected by the contents, and has moderate rigidity and capping. easily. Therefore, the material that can be used in the injection hole plug 87 may be, for example, polyethylene having a density of 0.900 g / cm ³ or more and 0.950 g / cm ³ or less, such as low density polyethylene and linear low density polyethylene, but the medium density Polyethylene, mixed resins of low-density and high-density polyethylene, ionomer resins, ethylene-vinyl acetate copolymers, and resins mixed with the above materials can also be used. Among them, linear low-density polyethylene is particularly preferred. In actual use, after forming with various resins, it is welded to the paper container body, and the contents of the predetermined filling are used to perform an environmental stress cracking test, and then appropriately selected.

The paper container used in the present invention is a container using paper as the main body, and the base paper is a paperboard with a basis weight of 200 g / m ² to 800 g / m ^2. When printing is performed on the surface, one side can be white. White cardboard, white particleboard, ivory and other cardboard. Furthermore, since it must be heat-sealed to the peripheral edge of the opening of the container, a thin polyethylene film of 15 μm to 100 μm, an ethylene-vinyl acetate copolymer, or a polypropylene film, etc., are bonded using the back sealing layer. Laminated board with excellent thermoplastic film. Among the above layers, the sealing layer is preferably a linear low-density polyethylene having a density of 0.925 g / cm ³ or less, a melt index of 4 g / 10 min or more, and a thickness of 30 to 100 μm. In order to protect the edge of the paper container, it is preferable to provide the above-mentioned sealing layer on the front side. In addition, the aluminum paper, aluminum vapor-deposited polyethylene terephthalate, metal oxide vapor-deposited polyethylene terephthalate, and ethylene-vinyl acetate can be adhered and laminated between the base paper and the sealing layer. Films of copolymer alkalis and polyamide resins with high crack resistance. For example, consider polyethylene / paper / polyethylene, polyethylene / paper / polyethylene / inorganic oxide vapor-deposited polyethylene terephthalate / polyethylene, polyethylene / paper / polyethylene / aluminum from the outside Evaporation polyethylene terephthalate / polyethylene, polyethylene / paper / polyethylene / aluminum foil / polyethylene terephthalate / polyethylene, polyethylene / paper / polyethylene / ethylene-vinyl acetate copolymerization Alkali / polyethylene, polyethylene / paper / polyethylene / adhesive resin / polyamine / adhesive resin / polyethylene etc. These can be easily produced with a dry laminator or an extrusion laminator.

The injection hole plug of this embodiment is excellent in ultrasonic fusion, can be welded in a short time, and has high productivity, and when the injection hole plug is removed for disposal, it can be disassembled without using a knife such as a cutlery knife. So it's safe, and the burden on the discarded person is less. In particular, it is easy to decompose, so it is expected that fewer people will directly discard without removing the plug. In addition, since the present invention simply adds a ring-shaped recess to the mold for injecting the plug, there is no need to change production equipment, and mass productivity is also very high, which has great advantages.

(Fourth Embodiment)

Hereinafter, a fourth embodiment of the present invention will be described.

FIG. 21 is a schematic explanatory diagram of an example of a pouring hole plug and a cap according to this embodiment. FIG. 22 is a schematic explanatory view of a packaging container according to this embodiment. FIG. 23 is a schematic explanatory view showing a flange portion of an injection hole plug example of the present embodiment in a cross section. FIG. 24 is a partially enlarged view of FIG. 23.

As shown in FIG. 21, the covered injection hole plug 900 of this embodiment is composed of an injection hole plug 91 and a cover 92. The injection hole plug 91 is formed of a side wall 911 as a injection passage and a flange portion 912 extending outward from a lower end portion of the side wall 911. Further, as shown in FIG. 22, the hole plug 900 is attached to the container body with the side wall 911 or the cover 92 protruding from the inside to the outside, and the upper surface of the flange portion 912 is welded to the inner surface of the container body 902.

This fusion splicing is legally achieved by ultrasonic sealing. The installation method is explained below. First, form a trunk portion and a side portion, and insert the hole plug 900 from the upper end opening portion of the container body whose upper end is opened, and then attach the screw The side wall 911 of the cover 2 is inserted into the hole-plugging opening portion.

Next, the flange portion 912 is brought into contact with the periphery of the inner surface side of the hole-plugging opening portion of the container body, the flange portion 912 is pressed from the inside by a welding anvil of the ultrasonic sealing machine, and the ultrasonic welding is performed by vibration welding The head applies ultrasonic vibration from the outside of the container body, and performs ultrasonic sealing and welding.

In the flange portion 912 of the hole plug 900 in this example, as shown in the cross-sectional view of FIG. 23 in which the right side of the flange portion 912 is cut at the front and rear central portions, the lower surface is provided with unevenness, and the upper surface is flat. The uneven structure includes a thin-walled annular groove portion 913 provided to surround the side wall 911 and a plurality of annular protrusion portions 914 provided apart from the annular groove portion 13.

Due to this cross-sectional shape, as described above, when the container body 902 is sealed with ultrasonic waves, the ring-shaped protruding portion 914 is in contact with the welding anvil, and the other portions are not in contact, and the ring-shaped protruding portion 914 is thick. The wall type, so the vibration energy generated by the ultrasound will be concentrated in this part, so that the annular protrusions 914 are partly melted and welded to the container body. The annular protrusions 914 are difficult to melt and difficult to weld with each other. The portion of the groove-shaped portion 913 is not welded.

Therefore, after the ultrasonic wave is sealed and installed in the container body, the wall thickness of the annular groove portion 913 is retained in a thin-walled state. Therefore, when the container is to be discarded after consumption, the annular groove portion 913 can be cracked and the side wall 11 can be removed from the container body 902. Therefore, the container body 902 can be separately collected as paper, and the environment is friendly.

Furthermore, since the portion of the annular protruding portion 914 is melted and welded together, it is difficult to affect the sealing performance even if the ultrasonic sealing conditions are looser than usual. And, by relaxing the ultrasound In the sealing condition, the flange portion 912 is not deformed by heat, so the possibility of a seal leak due to such deformation can be avoided.

In the uneven shape of the flange portion 912, the relationship between the width d16 of the annular groove portion 913, the width d17 from the annular groove portion 913 to the closest outer annular protrusion portion 914, and the width d18 of the annular protrusion portion 914 are relatively close. Preferably, d16 ≧ d17 ≧ d18.

In particular, the width d18 of the annular protrusion 914 is preferably narrow. By adopting this method, the energy of the ultrasonic vibration is more easily concentrated on the portion of the annular protruding portion 914 to be melted, and the energy is more difficult to be transmitted to the annular groove portion 13 without causing the leakage of the seal.

In addition, the relationship between the thickness d19 of the annular groove portion 913, the groove depth d20 of the annular groove portion 913, and the height d21 of the outer annular protrusion portion 914 is preferably d19 ≦ d20 ≦ d21. When the height d21 of the annular protrusion 914 increases, energy is easily concentrated, and the portion of the annular protrusion 914 is more likely to melt. In addition, by reducing the thickness d19 of the annular groove portion 913, it is easy to disconnect and separate when discarded.

The thickness d19 is preferably 0.20 mm or more, and more preferably 0.25 mm or more. If it is thinner than this, there is a possibility of falling off when using the cover, etc. In addition, when a middle cover opened by a pull ring is provided at the front end of the side wall, it is preferable that the thickness is thicker than the thin-walled easy-to-break portion provided on the periphery of the middle cover. If it is not set thicker, there is a concern that the annular groove portion 913 will be disconnected when the pull tab is opened.

The injection hole plug 91 or the lid 92 of the hole plug 900 can be manufactured by injection molding or the like. In order to seal the plug plug 91 to the inner surface of the container body, a thermoplastic resin such as polyethylene that can be used on the inner surface of the container body is used. Sealed thermoplastic resin molding. The cover 92 is preferably flexible enough to be capped to the injection hole plug 91, and a thermoplastic resin such as polyethylene or polypropylene is preferably used.

In addition, as the container body 902 on which the plug 900 is installed, a laminated material provided with a thermoplastic resin on the inside and outside of cardboard such as milk carton base paper can be used. When gas barrier properties are required, a barrier layer may be provided between the paperboard and the thermoplastic resin on the inner surface.

The barrier layer is preferably a vapor-deposited film using an inorganic oxide. The vapor-deposited inorganic oxide is preferably silicon oxide or aluminum oxide. In addition, as the base film of the inorganic oxide vapor-deposited film, resin films such as polyethylene terephthalate, nylon, and polypropylene are used. In particular, the biaxially stretched resin film is suitable for lamination processing or vapor deposition processing because it has low stretchability. Although aluminum foil is difficult to separate and recycle into paper, it can be used as a barrier layer.

In FIG. 22, the shape of the packaging container is a gable roof type (gable roof type) packaging container, but it is not limited to this. It can also be a brick type (tile type) packaging container with a flat top on the container, or the front of the top is The inclined portion and the rear portion are flat packaging containers and the like. The packaging container may be any packaging container in which a plug is attached to the opening of the container body.

Since the hole plug 900 of this embodiment is provided with a ring-shaped protruding portion 914 at the flange portion 912, as described above, when it is mounted on the container body 902, the sealing conditions for ultrasonic sealing can be relaxed. Compared to the case of sealing a conventional plug with a flat front and back surface of the flange portion under standard welding conditions. The sealing conditions can be relaxed as shown in Table 1.

Therefore, if the welding deformation and adhesiveness of the flange portion after ultrasonic sealing are compared, the conventional hole plug sealed under standard welding conditions has a large deformation of the flange portion, and there is a concern that a seal leak may occur due to the deformation. On the other hand, in the case where the hole plug of the present embodiment is sealed under a relaxed welding condition, the deformation of the flange portion is small, and there is no possibility of leakage of the seal.

In addition, in the flange portion after sealing, the portion of the annular groove portion 913 is groove-shaped and maintains the original thin-walled state. Therefore, in a state where the container body is flattened, the lid of the plug is pulled obliquely, and the portion of the annular groove portion 913 is cracked, so that the lid 92 and the side wall 911 of the plug 91 can be removed.

In addition, in order to check the adhesiveness, when the remaining flange portion is peeled off from the container body, the board of the container body is peeled off by interlayer peeling to form a paper layer peeling state. Therefore, even if the welding conditions are relaxed, Sealing unevenness will occur and can maintain a tight contact.

As described above, the injection hole plug of this embodiment is provided with a ring-shaped protrusion, so that the sealing does not occur, and the welding can be surely welded in the container. Device body, and when the plug is welded, there will be no pinholes due to heat in the annular groove, and there is no concern about leakage. In addition, after use, it can be easily removed from the container body by disconnecting the annular groove portion, which is suitable for the paper sorting and recycling.

The present invention is not limited to the embodiments described above, and can be modified and implemented as appropriate. For example, the injection hole plug of one embodiment may be combined with the container body of another embodiment.

[Example]

<Evaluation 1>

The injection hole plugs of Examples 1, 2 and Comparative Examples were prepared, and the welding conditions under which each injection hole plug can be appropriately welded to the container body were compared. The obtained welding conditions are shown in Table 2.

(Example 1)

As shown in FIG. 2A and FIG. 2B, the injection hole plug 1 with the rib 18 formed in the embodiment 1 is formed so as to extend radially from the center of the side wall 11.

(Example 2)

The injection hole plug 1 of the modified example 1 is manufactured in the second embodiment. As shown in FIG. 3A, in the plan view of the flange portion 15, a screw cap 2 is formed from the inside of the flange portion 15 to the outside, as shown in FIG. 3A. The rotation direction at this time is a rib 181 extending obliquely at 60 °.

(Comparative example)

In the injection hole plug produced as a comparative example, the depression 17 and the rib 18 were not formed in the injection hole plug 1.

For the injection plugs of Examples 1, 2 and Comparative Examples, the ultrasonic energy and amplitude (ratio with respect to a predetermined amplitude) required for proper ultrasonic welding, and the air pressure and time of the ultrasonic welding head were obtained. As shown in Table 2, compared with the comparative example, the welding ultrasonic energy and amplitude required for Examples 1 and 2 can be suppressed low. In addition, in Examples 1 and 2, it was confirmed that there was no damage caused by ultrasonic vibration in the injection hole plug after welding. It was also confirmed that the above-mentioned separation operation is easy.

<Evaluation 2>

The injection hole plugs of Examples 3, 4, and 5 were produced and evaluated.

(Example 3)

Production from the outside in order: polyethylene (thickness 20μm) / paper (base weight 400g / m ² ) / polyethylene (thickness 20μm) / deposited silicon oxide (evaporated thickness 60μm) / polyethylene terephthalate (Thickness: 12 μm) / polyethylene (thickness: 20 μm) / linear low-density polyethylene (thickness: 40 μm). This laminated board was formed into an outer shape and a folded line according to the developed view shown in FIG. 14 to obtain a liquid paper container with a bottom surface of 70 mm in length and width and a capacity of 1 liter. The injection hole plug 87 is an injection hole plug of the shape shown in FIG. 12, and is made by injection molding a low density polyethylene resin. Note that the welding of the hole plug and the paper container was performed using an ultrasonic welding machine with a vibration frequency of 20 KHz, and the welding was performed according to the conditions listed in Table 1.

(Example 4)

The same laminated plate as in Example 3 was prepared, and the laminated plate was formed into an outline and a fold line in the same manner as in Example 3 according to the expanded view shown in FIG. The injection hole plug 87 also uses the same product as that of the third embodiment. Note that the welding of the hole plug and the paper container was performed using an ultrasonic welding machine with a vibration frequency of 20 KHz, and the welding was performed according to the conditions listed in Table 1.

(Example 5)

The same laminated plate as in Example 3 was produced, and the laminated plate was formed into an outer shape and a fold line in the same manner as in Example 3 according to the expanded view shown in FIG. As shown in FIG. 20, the injection hole plug 87 is formed by injection-molding the same low-density polyethylene resin as in Example 3 to produce an injection hole plug having only one annular recess. Note that the welding of the hole plug and the paper container is performed using an ultrasonic welding machine with a vibration frequency of 20 KHz, and the welding is performed according to the conditions listed in Table 1.

<Evaluation test content>

The tests and comparative evaluations were carried out for Examples 3, 4, and 5 by the following methods.

<Deformation of injection hole plug>

It was confirmed whether the entire injection hole plug was deformed by the vibration of the ultrasonic welding and whether the flange of the annular recess was deformed.

Note that if the entire plug and the flange of the annular recess are not deformed, it is ++. Note that the deformation of the entire plug and the flange of the annular recess is-, Note that the hole plug as a whole, or the flange of the ring-shaped recessed part, is deformed as +.

<Liquid leaking out of the plug>

This item confirms whether the injection hole plug has broken the flange of the annular recessed portion due to the vibration of the ultrasonic welding, and has a crack or an opening. Five were made each, filled with water as the contents, and inverted for 3 days to confirm the presence of leaks. Five who did not leak were +, even when only one leaked.

<Crackability (Easily Decomposable) at the Disintegration of the Plug>

This item is bent at the bending line of the paper container through the center of the injection hole plug to confirm whether the flange of the annular recess of the injection hole plug will crack and can be easily removed. Three ordinary housewives are each given three of them, a total of nine. The paper container that has been decomposed within 15 seconds is ++ when there are 8 or more, + from 5 to 7, and-when 4 or less.

<Adhesion between injection hole plug and paper container>

Fill 1 liter of water into each of the 5 containers, and invert for 7 days, and check for liquid leakage. +7 if no leaks in 7 days, 4 leaks in 7 days and 1 leaks in 5 days +, 3 leaks in 7 days and 2 in 3 days Those who did not leak above were +, and those below were-.

<Evaluation Results>

In Example 3, there were no problems in the deformation of the injection hole plug, liquid leakage, and adhesion, and in terms of easy disassembly, the nine injection hole plugs could be reliably removed.

In Example 4, there was no problem in the deformation of the injection hole plug and the liquid leakage, and only one of the adhesiveness slightly leaked the liquid on the seventh day. In addition, in terms of easy decomposability, all 9 injection hole plugs can be reliably removed.

In Example 5, the injection hole plug was deformed, and the upper panel of the installed paper container was also deformed. In addition, although no liquid leakage occurred, However, the phenomenon of unevenness occurred in the tightness test, and the tightness occurred. In addition, in the easy-to-decompose test, there is no decomposability at all, and when removing the injection hole plug, a cutter such as scissors or a cutlery knife is required.

It is considered that the injection hole plugs of Examples 3 and 4 are welded at a higher temperature and a larger amplitude than those of Examples 1 and 2 to further improve the adhesion with the paper container. In the injection hole plug of Example 5, under the same welding conditions as in Example 1, any evaluation item can obtain appropriate results.

[Industrial availability]

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

Claims (29)

An injection hole plug includes: a cylindrical side wall; and a disc-shaped flange portion provided to extend outward from one end edge of the side wall. The flange portion has a planned disconnection portion, and the planned disconnection portion is A plurality of recessed portions separated by a plurality of ribs are arranged in a ring shape, and the planned disconnection portion is formed on a surface of the flange portion opposite to the side wall. This surface is the bottom surface and is in a plane of the flange portion. In view, the plurality of ribs are formed so as to extend in a radial shape from the center of the cylindrical side wall, respectively. As in the hole plug of claim 1, wherein the outer peripheral surface of the side wall is formed with a screw thread for the screw cap, the plan view of the flange portion, the plurality of ribs are from the inside to the outside of the flange portion. The cover is formed so as to extend obliquely at a first predetermined angle smaller than a right angle when the cap is screwed onto the cover. For example, as described in claim 2, in the plan view of the flange portion, as the plurality of ribs, a plurality of ribs are further formed from the inner side to the outer side of the flange portion when the lid is screwed on. A rib extending in a direction opposite to the direction of rotation and inclined at a second predetermined angle. For example, the injection hole plug of claim 2 or 3, wherein the first predetermined angle is 60 °. For example, as described in claim 3, the second predetermined angle is 60 °. The injection hole plug according to any one of claims 1 to 3, wherein the top surface of the plurality of ribs is included in the same plane as the bottom surface of the flange portion. The injection hole plug according to any one of claims 1 to 3, wherein a thickness of a portion of the flange portion where the concave portion is formed is set to d1, and a distance separated between each of the concave portions by each of the plurality of ribs is set. It is d2, and when the width of each said recessed part is set to d3, the relationship of d2 <d1 <d3 is satisfied. As in the injection hole plug of claim 1, wherein the flange portion is a side surface of the side wall of the container body welded to the entire circumference of the injection hole of a predetermined diameter of the container body, the recess portion has a concentric circle shape with the side wall A state where the first wall surface of the first wall surface and the second wall surface on the outer peripheral side of the first wall surface are connected to the first wall surface and the second wall surface at predetermined angles, respectively, and the flange portion is fused to the container body. The outer peripheral diameter d4 of the side wall facing the inner peripheral surface of the injection hole, the inner peripheral diameter d5 of the injection hole, and the outer peripheral diameter d6 of the connection portion between the first wall surface and the top surface conform to d4 +. d6 ≧ 2 × d5. According to the injection hole plug of claim 8, wherein the thickness d7 of the flange portion on the top surface is 0.15 mm or more and 0.45 mm or less. In the injection hole plug of claim 8 or 9, wherein the width d8 of the top surface in the radial direction of the recessed portion is 0.3 mm or more and 1.0 mm or less. For example, the hole plug of claim 8 or 9, wherein the width d9 of the rib in the circumferential direction of the recess is 0.15 mm or more and 0.45 mm or less. According to the injection hole plug of claim 10, a width d9 of the rib in the circumferential direction of the recessed portion is 0.15 mm or more and 0.45 mm or less. According to claim 8 or 9, the ribs are provided with an odd number of ribs equally divided in a circumferential direction of the recess. According to the injection hole plug of claim 8 or 9, wherein the first wall surface and the second wall surface are chamfered into a circular arc surface at a portion connected to the bottom surface of the flange portion. For example, the injection hole plug of claim 1, wherein the flange portion is a portion of the side surface of the side wall that is welded to the entire circumference of the injection hole of a predetermined diameter of the container body, and the flange portion is closer to the predetermined diameter than the predetermined diameter. On the inner diameter side, a plurality of first recessed portions separated by a plurality of ribs are formed in a ring shape. As the aforementioned scheduled disconnection portion, a plurality of second recessed portions separated by a plurality of ribs are further formed and arranged as the first One or more rings of concavity. For example, the hole plug of claim 15, wherein the first and second recesses are provided on a surface of the flange portion opposite to the side wall, the surface is the bottom surface, and the first recess is arranged in a ring shape. On the innermost side. For example, the injection hole plug of claim 16, wherein the innermost diameter of the first and second recessed portions arranged annularly at the innermost portion is equal to the diameter of the lower end of the side wall and the connecting portion of the flange portion. . For example, the hole plug of claim 16 or 17, wherein the number of the ribs formed in each of the rings is equal. As described in claim 16 or 17, the width d10 of the ribs separating the first recesses in the circumferential direction is smaller than the width d11 of the ribs separating the second recesses in the circumferential direction. For example, the hole plug of claim 16 or 17, wherein the thicknesses d12 and d13 of the first and second recessed portions of the flange portion are smaller than the circumferential width d10 of the ribs separating the first recessed portion and are smaller than The width d14 of the first concave portion in the radial direction. According to claim 16 or 17, the thickness of the first and second recessed portions of the flange portion d12 and d13 is 0.2 mm or more and 0.3 mm or less. For example, as described in claim 16 or 17, the second recessed portion is formed as an arc of a circular arc having a predetermined curvature radius in the radial section, and the radial direction of the first recessed portion is not formed. A circular arc, or a corner of a circular arc having a curvature radius smaller than the aforementioned predetermined curvature radius. According to the injection hole plug of claim 15, at least the second recessed portion is provided on a surface of the side wall side of the flange portion in a plurality of concentric circles. The injection hole plug of any one of claims 15 to 17 and 23, wherein each of the plurality of ribs separating the first recessed portion and each of the plurality of ribs separating the second recessed portion are from the foregoing When viewed from the center of the flange, the lines are formed in positions different from each other. An injection hole plug includes: a cylindrical side wall; and a disc-shaped flange portion provided to extend outward from an end edge of the side wall, and the flange portion is on a side of the flange portion opposite to the side wall. The bottom surface of the surface has an annular groove portion and one or more annular protruding portions spaced a predetermined distance from the annular groove portion to the outside. As in the injection hole plug of claim 25, the relationship between the width d16 of the annular groove, the distance d17 from the annular groove to the closest outer annular protrusion, and the width d18 of the annular protrusion It is d16 ≧ d17 ≧ d18. The injection hole plug of claim 25 or 26, wherein the relationship between the thickness d19 of the annular groove portion, the groove depth d20 of the annular groove portion, and the height d21 of the annular protruding portion on the outer side is d19 ≦ d20 ≦ d21 . A packaging container comprising: a container body, which is formed by bending a sheet to form a box shape, and has an injection hole; and the injection hole plug according to any one of claims 1 to 27, which is welded by the flange portion described above. It is formed on the aforementioned sheet material and installed in the aforementioned injection hole. The packaging container according to claim 28, wherein a wire-shaped weakened portion is formed in the container body, and a fold line generated by bending the container body along the weakened portion passes through the injection hole.