JP2016188087A - Plug of paper container for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug of a paper container for a liquid which enables welding of the plug to a body of the paper container for the liquid, makes pin holes unlikely to open during welding of the plug, and is easily removed from the body of the paper container for the liquid after use, suitable for separate collection, and eco-friendly.SOLUTION: A plug is attached to an open hole part of a body of a paper container for a liquid by ultrasonic sealing and comprises a spout and a cap. The spout comprises: a pouring part forming a pouring passage; and a flange part 12 extending outward from a lower end portion of the pouring part. A thin annular groove part 13 is provided on a surface opposite to a surface of the flange part which seals the paper container for the liquid so as to surround the pouring part, and one or more annular protrusion parts 14 are provided separated from the groove part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stopper for a liquid paper container. In particular, the present invention relates to a stopper for a liquid paper container in which the spout of the spout consisting of a spout and a cap can be easily separated so that the liquid paper container can be easily discarded after the contents are consumed.

  Liquid paper containers used for liquid contents of foods and non-foods are widely used for liquid drinks such as fruit juice drinks, juices, teas, coffees, milk drinks, soups, and alcoholic beverages such as sake and shochu. This liquid paper container is made of a laminated material in which a paper layer and a sealant layer made of a thermoplastic resin are provided on at least an inner surface of the paper layer, and an aluminum foil or an aluminum vapor deposition film is provided between the paper layer and the sealant layer. Or there exist what provided the layer with barrier property, such as an inorganic oxide vapor deposition film, etc. (for example, patent document 1).

  In recent years, empty containers have been dismantled at the time of disposal by separating and collecting empty containers after use and reducing the volume of waste due to environmental conservation problems. However, there are some gable-top type liquid paper containers that have a stopper on the roof plate. However, since the stopper is firmly welded, the stopper can be separated with a pair of scissors. It was difficult except to cut around and separate.

  Therefore, a liquid paper container that can easily separate the cap from the liquid paper container body has been developed. For example, a faucet composed of a spout and a cap is formed with a weakened portion consisting of a thin portion that can be broken on the inner peripheral side upper surface of the flange portion extending outward from the lower end portion of the outer surface of the pouring portion serving as a spout passage. The upper surface radially outward from the weakened portion is adhesively fixed to the peripheral edge of the opening of the liquid paper container, and the flange portion outside the weakened portion is completely separated from the pouring portion when the weakened portion is broken. Has been developed (Patent Document 2).

  In this plug, the flange part outside the weakened part is completely separated from the pouring part, and the liquid paper container can be discarded by removing the pouring part side, but the thin part is provided on the upper surface of the flange part Therefore, there is a possibility that a pinhole is opened in the thin wall portion when the plug is welded.

  In addition, when attaching the plug to the liquid paper container main body, it is easy to cause uneven sealing without devising the shape of the horn on the ultrasonic sealing machine side for stable welding. In general, due to such uneven sealing, the seal tends to be sealed under excessive conditions in order to avoid the occurrence of seal leakage. For this reason, the flange portion of the plug may be deformed to cause seal leakage on the contrary. There is also.

  Known documents are shown below.

JP 2003-335362 A JP 2011-73748 A

The present invention has been made in view of such problems, and can reliably weld the stopper to the liquid paper container body, and there is no risk of opening a pinhole when the stopper is welded. It is an object of the present invention to provide a stopper for an environmentally friendly liquid paper container that can be easily removed and is suitable for separating and collecting paper.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the invention of claim 1 is a spigot that is attached to an opening of a liquid paper container body by ultrasonic sealing, and comprises a spout and a cap, The pouring part comprises a pouring part serving as a pouring path and a flange part extending outward from a lower end portion of the pouring part, and the pouring part is disposed on a surface of the flange part opposite to a surface sealed to the liquid paper container. The liquid paper container cap is characterized in that a thin annular groove is provided so as to surround, and one or more annular protrusions are provided apart from the annular groove.

  The invention according to claim 2 of the present invention is characterized in that the annular groove portion remains thin even after being attached to the liquid paper container main body by an ultrasonic seal. It is a container stopper.

  According to a third aspect of the present invention, the relationship between the width a of the annular groove, the width b from the annular groove to the nearest outer annular protrusion, and the width c of the annular protrusion is a ≧ b ≧ 3. The cap of the liquid paper container according to claim 1 or 2, wherein c.

  According to a fourth aspect of the present invention, the relationship between the thickness d of the annular groove, the depth e of the groove of the annular groove, and the height f of the annular protrusion on the outside thereof is d ≦ e ≦ f. 4. The cap of the liquid paper container according to claim 1, wherein the cap is a liquid paper container.

  The stopper of the liquid paper container of the present invention is provided with an annular protrusion on the surface of the flange portion opposite to the surface to be sealed to the liquid paper container. The vibration energy of the ultrasonic seal is concentrated on the annular projection and the vibration energy is not easily transmitted to the annular groove, so there is no risk of pinholes opening in the annular groove when plugged. After use, the annular groove can be cut and the spout pouring part can be easily removed from the liquid paper container body. For this reason, it is suitable for separating and collecting paper and is environmentally friendly.

It is explanatory drawing which showed typically an example of the stopper of the liquid paper container of this invention. It is explanatory drawing which showed typically the liquid paper container which attached an example of the stopper of the liquid paper container of this invention. It is explanatory drawing which showed typically the flange part of an example of the stopper of the liquid paper container of this invention in the cross section. FIG. 4 is a partially enlarged view of FIG. 3.

Hereinafter, embodiments for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing an example of the stopper of the liquid paper container of the present invention. FIG. 2 is an explanatory view schematically showing a liquid paper container to which an example of the stopper of the liquid paper container of the present invention is attached. FIG. 3 is an explanatory view schematically showing a flange portion of an example of the stopper of the liquid paper container of the present invention in cross section. FIG. 4 is a partially enlarged view of FIG.

As shown in FIG. 1, the stopper 100 of the liquid paper container of the present example includes a spout 1 and a cap 2, and the spout 1 is formed from a pouring portion 11 serving as a pouring path and a lower end portion of the pouring portion 11. It consists of a flange portion 12 extending outward. As shown in FIG. 2, the spigot 100 is attached to the liquid paper container main body so that the pouring part 11 and the cap 2 come out from the inside, and the upper surface of the flange part 12 is the inner surface of the liquid paper container main body 200. It is welded to.

  This weld is attached by an ultrasonic seal. The attachment method is as follows. First, the cap 100 is inserted through the opening at the upper end of the liquid paper container main body having the body portion and the side portion, and the upper end is opened, and the cap 2 is fitted into the opening portion for attaching the plug. Insert the protruding portion 11.

  Then, the flange portion 12 is brought into contact with the periphery of the inner surface side of the opening portion for attaching the cap of the liquid paper container main body, and the flange portion 12 is pressed from the inside by the welding receiving anvil of the ultrasonic sealing machine, and the liquid paper container main body Ultrasonic vibration is applied from the outside with an ultrasonic welding horn to perform ultrasonic sealing and welding.

  As shown in FIG. 3, the flange portion 12 of the spigot 100 of the present example is provided with irregularities on the lower surface and the upper surface is flat, as shown in a cross-sectional view of the right side of the flange portion 12 cut at the front and rear central portion. The unevenness includes a thin annular groove portion 13 provided so as to surround the extraction portion and a plurality of annular protrusion portions 14 provided away from the annular groove portion 13.

  Because of such a cross-sectional shape, as described above, when ultrasonically sealing the liquid paper container main body 200, the annular projection 14 is in contact with the weld receiving anvil, and the other portions are not in contact. Since the annular protrusion 14 is thick, the vibration energy by the ultrasonic waves is concentrated on this portion, and the portion of the annular protrusion 14 is intensively melted and welded to the liquid paper container body. The annular protrusions 14 are hardly melted and are not easily welded. Further, it is not welded at the portion of the annular groove 13.

  Therefore, the thickness of the annular groove 13 remains thin even after ultrasonic sealing and attachment to the liquid paper container body. For this reason, when the liquid paper container is discarded after the contents are consumed, the annular groove portion 13 can be broken and the dispensing portion 11 can be detached from the liquid paper container main body 200. For this reason, the liquid paper container main body 200 can be used for separating and collecting paper, which is environmentally friendly.

  Further, since the annular protrusion 14 is melted and welded in a concentrated manner, the sealing performance is hardly affected even if the conditions are relaxed from the usual ultrasonic sealing conditions. By relaxing the ultrasonic sealing conditions, the flange 12 is not deformed by heat, and the risk of seal leakage due to this deformation can be avoided.

  In the uneven shape of the flange portion 12, the relationship between the width a of the annular groove portion 13, the width b from the annular groove portion 13 to the nearest outer annular projection portion 14, and the width c of the annular projection portion 14 is a ≧ b ≧ c is preferred.

  In particular, it is preferable that the width c of the annular protrusion 14 be narrowed. By doing in this way, the energy of ultrasonic vibration concentrates on the part of the annular projection 1 and it becomes easy to melt, and it becomes difficult to transmit energy to the annular groove part 13, so that there is no possibility of seal leakage.

  The relationship between the thickness d of the annular groove 13, the depth e of the groove of the annular groove 13, and the height f of the annular protrusion 14 on the outer side is preferably d ≦ e ≦ f. When the height f of the annular protrusion 14 is increased, energy tends to concentrate and the portion of the annular protrusion 1 is likely to melt. Further, by increasing the thickness d of the annular groove 13, the annular groove 13 is easily cut when discarded and easily separated.

  The thickness d is preferably 0.20 mm or more, and more preferably 0.25 mm or more. If it is thinner than this, the cap may be removed during use, such as opening the cap. In addition, when an inner lid that is opened by a pull ring is provided at the tip of the extraction portion, it is necessary to be thicker than the thickness of the thin easily cut portion provided at the periphery of the inner lid. Otherwise, the annular groove 13 may be broken when the pull ring is pulled and opened.

  The spout 1 and the cap 2 of the plug 100 can be manufactured by injection molding or the like. The spout 1 is molded using a sealable thermoplastic resin and a thermoplastic resin such as polyethylene on the inner surface of the liquid paper container body in order to seal the inner surface of the liquid paper container body. Moreover, it is preferable that the cap 2 has a certain flexibility so that it can be plugged into the spout 2, and a thermoplastic resin such as polyethylene or polypropylene is preferably used.

  The liquid paper container main body 200 to which the stopper 100 is attached uses a laminated material in which a thermoplastic resin is provided on the inner and outer surfaces of paperboard such as milk carton base paper. When gas barrier properties are required, a barrier layer is provided between the paperboard and the thermoplastic resin on the inner surface.

  As the barrier layer, an inorganic oxide vapor deposited film is preferably used. As the inorganic oxide to be deposited, silica, alumina or the like is preferably used. Moreover, as an inorganic oxide vapor deposition film base film, resin films, such as a polyethylene terephthalate, nylon, a polypropylene, are used. In particular, a biaxially stretched resin film is preferably used because it has less expansion and contraction during bonding and vapor deposition. An aluminum foil can be used for the barrier layer, but it is not suitable for separating and collecting and recycling it to paper.

  In FIG. 2 of this example, the shape of the liquid paper container is a gable top type (gable roof type) liquid paper container, but is not limited to this, and a brick type (brick type) liquid paper with a flat top. The container may also be a liquid paper container or the like in which the front part of the top part is an inclined part and the rear part is flat. Any liquid paper container that attaches a stopper to the opening of the liquid paper container body may be used.

  Since the spigot 100 of the present example is provided with the annular protrusion 14 on the flange portion 12, as described above, the sealing conditions of the ultrasonic seal when attached to the liquid paper container main body 200 can be relaxed. The sealing conditions can be relaxed as shown in Table 1, as compared with the case where a conventional plug with a flat flange portion is sealed under standard welding conditions.

このため、超音波シール後のフランジ部溶着変形と密着性を比較すると、標準溶着条件でシールした従来の口栓は、フランジ部の変形が大きく、この変形によりシール漏れする恐れがある。一方、本例の口栓を緩和溶着条件でシールした場合は、フランジ部の変形は小さく、シール漏れする恐れはなかった。

For this reason, when comparing the welding and deformation of the flange after ultrasonic sealing, the conventional plug sealed under the standard welding conditions has a large deformation of the flange, and there is a risk of seal leakage due to this deformation. On the other hand, when the plug of this example was sealed under relaxed welding conditions, the deformation of the flange portion was small and there was no fear of seal leakage.

  And the part of the annular groove part 13 became a groove | channel in the flange part after sealing, and it was thin as it is. For this reason, when the liquid paper container main body is crushed and the cap of the cap is held and pulled up obliquely, the portion of the annular groove portion 13 is broken, and the cap 2 and the spout portion 11 of the spout 1 are broken. Was able to be removed.

  Also, in order to investigate the adhesion, when the remaining flange part is peeled off from the liquid paper container main body, the paperboard of the liquid paper container main body is delaminated and peeled off, and is in a state for paper. There was no seal unevenness and it was in close contact.

  As described above, since the stopper of the liquid paper container of the present invention is provided with the annular protrusion, sealing unevenness does not occur, and the stopper can be reliably welded to the liquid paper container main body. No pinhole due to heat is generated in the annular groove during welding, and there is no risk of leakage. After use, the annular groove portion is cut so that it can be easily removed from the liquid paper container main body, and is suitable for separation and collection of paper and is an environmentally friendly liquid paper container cap.

DESCRIPTION OF SYMBOLS 100 ... Plug 1 ... Spout 11 ... Extraction part 12 ... Flange part 13 ... Annular groove part 14 ... Annular projection part 2 ... Cap 200 ... Liquid paper container main body

Claims (4)

  A spout attached to the opening of the liquid paper container main body with an ultrasonic seal, comprising a spout and a cap, the spout being outward from a pouring portion serving as a pouring path and a lower end portion of the pouring portion And a thin annular groove portion is provided on the surface of the flange portion opposite to the surface to be sealed to the liquid paper container so as to surround the pouring portion, and is separated from the annular groove portion. A cap for a liquid paper container, comprising at least two annular protrusions.   The cap of the liquid paper container according to claim 1, wherein the annular groove portion remains thin even after being attached to the liquid paper container body by ultrasonic sealing.   The relationship between the width a of the annular groove, the width b from the annular groove to the nearest outer annular protrusion, and the width c of the annular protrusion is a ≧ b ≧ c. 3. A stopper for a liquid paper container according to 1 or 2.   2. The relationship between the thickness d of the annular groove portion, the depth e of the groove of the annular groove portion, and the height f of the annular projection portion outside thereof is d ≦ e ≦ f. 4. The stopper of the liquid paper container according to any one of items 1 to 3.

Images