JP5640355B2 - Outlet stopper and packaging container - Google Patents

Description

  The present invention relates to a spout stopper attached to a liquid packaging container.

  2. Description of the Related Art Conventionally, as a packaging container for packaging a liquid such as sake or juice, a paper container provided with a resin spout stopper is widely used. In general, the spout stopper includes a cylindrical spout having a flange and a cap attached to the spout. The spout is fitted from the inside so as to pass through the opening formed in the packaging container, and the flange provided on the spout and the inner surface of the paper container are thermally welded.

Japanese Patent Laid-Open No. 11-227817 JP 2000-296865 A JP 2003-72817 A Japanese Patent Laid-Open No. 2004-67101 JP 2004-149164 A

  Paper containers equipped with spout stoppers are used for packaging liquids with high viscosity such as sauce and cooking oil, as well as liquids with relatively low viscosity such as sake and juice. Regardless of the viscosity of the contents, it is desirable that the spout of the spout tap can pour out the contents with good liquid breakage and does not drip on the outer surface of the spout.

  Therefore, an object of this invention is to provide the spout stopper provided with the spout excellent in the liquid cutting property, and a packaging container provided with the same.

The present invention relates to a spout stopper attached to a liquid packaging container. The spout line includes a spout having a cylindrical side wall, a ridge continuously provided on the outer peripheral edge of one end of the side wall, and a cap attached to the spout. The cross section of the ridge in the radial direction of the spout is an outline line that extends from the outer peripheral edge of the side wall toward the other end of the side wall, and then curves in the radial direction of the side wall to reach the side wall. It has a prescribed shape, and a flat surface is provided at one end of the side wall. With the cap attached to the spout, the flat surface provided at one end of the side wall abuts the inner surface of the cap, and the side wall The inner surface of one end of the cap is provided with a taper whose inner diameter increases toward the one end side, the thickness of the side wall decreases toward the one end side, and the cap is attached to the spout An inner ring is provided that contacts and engages the inner surface of the side wall, and the outer diameter of the inner ring is larger than the inner diameter of one end side portion of the side wall, and the inner ring fits inside the side wall in a state where the side wall is expanded. To do.

  The liquid packaging container according to the present invention includes a paper container main body and the above-described spout stopper that is welded to the container main body.

  According to the present invention, the liquid stripping property can be improved even for highly viscous contents by the ridges provided at the end portions of the side wall of the spout.

The perspective view which shows the packaging container for liquids concerning the 1st Embodiment of this invention Sectional view of the II-II line shown in FIG. Enlarged view of the tip of the spout shown in FIG. The figure which shows the front-end | tip shape of the spout which concerns on the comparative example 1. The figure which shows the front-end | tip shape of the spout which concerns on the comparative example 2. The figure which shows the front-end | tip shape of the spout which concerns on the comparative example 3. The figure which shows the front-end | tip shape of the spout which concerns on the comparative example 4. The front view of the cap with which the spout stopper which concerns on the 2nd Embodiment of this invention is provided. Top view of the cap shown in FIG. The figure which shows the use condition of the cap which concerns on the 2nd Embodiment of this invention.

(First embodiment)
FIG. 1 is a perspective view showing a liquid packaging container according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. FIG. 3 is an enlarged view of the tip portion of the spout shown in FIG.

In addition, in FIG. 3, the boundary of a side wall and a protrusion is described with the dashed-two dotted line. The boundaries in the cross section, corresponding to an extension of a portion projections are not provided (the lower direction of a portion of FIG. 3 from the point P _4).

  The packaging container 1 is a carton container used for packaging various liquids such as foods such as alcoholic beverages, beverages and seasonings, and daily necessaries such as liquid detergents, and a container body formed of a laminated sheet mainly composed of paper. 2 and a spout stopper 3 welded to the container body 2.

  As shown in FIG. 2, the spout stopper 3 includes a spout 4 fixed to the container body 2 and a cap 5 that is detachably attached to the spout.

  The spout 4 includes a cylindrical side wall 6, a partition wall 7 for closing the inside of the side wall, a support column 8 connected to the partition wall 7, an annular pull ring 9 connected to the support column 8, and one end of the side wall 6 (see FIG. 2 is continuously provided along the outer peripheral edge of the upper end 2, the flange 13 is provided continuously along the entire circumference of the other end of the side wall 6 (lower end in FIG. 3), and the outer surface of the side wall 7. And a plurality of claws 19 provided intermittently in the circumferential direction of the side wall on the other end side of the side wall 6.

  By forming the thin wall portion 10 extending in an annular shape on the lower surface of the partition wall 7, the thickness of the partition wall in the thin wall portion 10 portion is made thinner than other portions. The thin wall portion 10 is for easily separating a part of the partition wall 7 surrounded by the thin wall portion 10 from the side wall 6 by pulling the pull ring 9 so that the packaging container 1 can be opened. The spout 4 is integrally molded using a resin such as low density polyethylene (LDPE).

  The details of the ridges 12 will be described later.

  The cap 5 has a circular top plate 14, a cylindrical peripheral wall 15 suspended from the outer periphery of the top plate 14, a screw 16 provided on the inner surface of the peripheral wall 15 and screwed into the spout screw 11. And a cylindrical inner ring 17 connected to the inner surface of the top plate 14. The inner ring 17 is for enhancing the sealing property of the opened packaging container 1, and when the cap 5 is attached to the spout 4, the outer surface abuts against and fits with the inner surface of the side wall 6 of the spout 4. . More specifically, the outer diameter of the inner ring 7 is set to be slightly larger than the inner diameter of the open end portion of the side wall 6 of the spout 4, and the inner ring 7 is fitted into the side wall 6 in a state where the side wall 6 is expanded. Match. Thereby, the inner ring 7 and the side wall 6 are in close contact with each other, and the sealing performance is improved. The cap 5 is integrally formed using a resin such as polypropylene (PP).

Here, as shown in FIG. 3, the cross section of the ridge 12 is defined by an outer shape connecting the points P _{1 to} P ₄ . More specifically, the contour line of the cross-section of the ridge 12 is a boundary (two points) with the side wall 6 from the point P ₁ on the outer peripheral edge of one end (the upper end in FIG. 3) of the side wall 6 toward the other end of the side wall. A concave arc that extends in a convex arc that increases the distance from the chain line), then bends in the radial direction of the side wall 6 at point P ₂ , extends to point P ₃ , and then decreases in diameter toward the other end of the side wall 6. Is drawn to reach a point P ₄ on the outer surface of the side wall 6. By defining the cross-section of the ridge 12 with outlines extending to the points P _{1 to} P ₃ shown in FIG. 3, a curved surface whose diameter increases with increasing distance from the open end is formed on the upper surface on the open end side. By providing this curved surface, the liquid breakage can be improved regardless of the viscosity of the contents. Further, by bending in the radial direction at the point P ₂ the outline of ridge 12, the touch of the outermost peripheral portion of the ridge 12 is also good.

  Further, a tapered portion 18 having a tapered shape whose diameter increases toward the open end is formed on the inner surface of the open end portion of the side wall 6 of the spout 4. The taper portion 18 further improves the liquid drainage and facilitates the fitting of the inner ring 17 to the side wall 6 when the cap 5 is attached. Moreover, when the cap 5 is pushed in and the liquid remaining inside the mouth is closed by such a structure, there is also an effect that the taper portion 18 and the inner ring 17 return to the lower side (inner wall inner surface). That is, because of this, no liquid remains on the upper inner side of the mouth, so that the liquid breakage is further improved.

As shown in FIG. 2, the inner surface of the peripheral wall 15 of the cap 5 is provided with a portion having no thread from the open end (the lower end in FIG. 2) to the height H ₁ in the axial center direction. The height H ₁ is set to be 1/3 to 1/2 of the height H ₂ of the inner surface of the peripheral wall 15. As described above, when the starting point of the screw 16 of the cap 5 is disposed inward by the height H ₁ from the open end, the amount of rotation of the cap 5 at the time of opening and closing can be reduced, thereby improving usability.

The outermost diameter R ₁ of the ridge 12 of the spout 4 is set to be equal to the inner diameter R ₂ of the screw 16 of the cap 5. When the cap 5 is closed, if the center axis of the cap 5 is deviated from the center axis of the spout 4, the upper surface of the ridge 12 contacts the screw 11 in the cap 5, but the curved surface of the ridge 12 is screwed 11 functions as a guide. Therefore, the cap 5 can be easily fitted into the spout 4.

Further, when the cap 5 is closed, if the center axis of the cap 5 is tilted with respect to the center axis of the spout 4, oblique tightening may occur. In addition, when capping is performed using a capper, if the open end of the spout 4 does not successfully get over the screw 16 of the cap 5 and the amount of insertion into the cap is insufficient, the screwed state becomes incomplete, resulting in insufficient closing. is there. In particular, as in this embodiment, when the starting point of the screw 16 of the cap 5 is provided at the position of the height H ₁ from the open end, the amount of insertion of the spout 4 before screwing is large, so there is no oblique closing or insufficient closing. Likely to happen. However, in the spout 1 according to the present embodiment, the screw 16 of the cap 15 is guided by the curved surface formed on the ridge 12, and the central axes of the cap 5 and the spout 4 are substantially aligned with each other. Since the spout 4 is inserted deeply into the cap 5 to a position where the screws 11 and 16 come into contact with each other, it is possible to prevent oblique closing and insufficient closing by the capper device.

Furthermore, in this embodiment, in a state where the cap 5 and the spout 4 are completely screwed together, the upper end of the side wall 6 abuts on the inner surface of the top plate 14, and the outermost periphery of the ridge 12 and the peripheral wall 15 of the cap 5 The inner surface is separated. Even if some liquid remains, the tip of the convex 12 leads to the outside (outside air) and is easy to dry, and the next liquid drainage is further improved.

  In addition, in said embodiment, although the structure which a cap and a spout screw together is employ | adopted in this embodiment, if it is a structure which can open and close a spout stopper, it will not specifically limit. For example, a structure in which the outer surface of the spout is simply covered with the inner surface of the cap or a structure in which the cap and the spout are fitted may be employed.

  Furthermore, in the present embodiment, as an example, the spout is molded with LDPE and the cap is molded with PP, but the present invention is not limited to these, and other resins may be used.

  Further, in the present embodiment, a paper container is used, but it is not particularly limited as long as it can enclose a liquid content, and a spout stopper may be attached to a resin pouch or gusset bag.

  Furthermore, in this embodiment, the tapered portion is provided on the inner surface of the open end portion of the side wall, but the tapered portion may not be provided.

  Furthermore, in this embodiment, the inner ring is provided inside the cap, but the inner ring may not be provided when strict sealing is not required after opening.

  Furthermore, in the present embodiment, the upper end of the side wall and the top plate inner surface of the cap are in contact with each other when the cap is completely screwed into the spout. However, depending on the viscosity of the contents, these may not contact each other. You may form the side wall or the inner surface of a top plate.

  Furthermore, in this embodiment, the outermost diameter of the ridge is set to be equal to the inner diameter of the cap screw. However, when the guide function by the ridge is not important, the inner diameter of the cap screw Thus, the outermost diameter of the ridge may be significantly reduced.

  Further, in the present embodiment, the shape of the pull ring is specified, but the shape of the pull ring may be arbitrary.

(Second Embodiment)
FIG. 8 is a front view of a cap provided in the spout stopper according to the second embodiment of the present invention, and FIG. 9 is a top view of the cap shown in FIG.

  The cap 5 according to the present embodiment is integrally formed of, for example, PP, and includes a circular top plate 14, a cylindrical peripheral wall 15 that hangs downward from an outer peripheral edge of the top plate 14, and a peripheral wall 15. And knurling 20 formed on the outer surface of the. The knurl 20 is configured by providing, on the outer surface of the peripheral wall 15, a plurality of protrusions 21 having a substantially triangular cross section and extending in the axial direction of the cap 5 at a constant pitch in the circumferential direction.

  The ridges 21 go from the outer surface of the peripheral wall 15 to the substantially radial direction of the cap 5 and from the outer edge of the rising surface 22 in the counterclockwise direction when viewed from the outer surface of the top plate 14. And an inclined surface 23 that inclines so as to approach the outer surface of the peripheral wall 15. In addition, by providing the ridge members 21 intermittently in the circumferential direction of the cap 5, a substantially flat flat portion 24 constituting the outer surface of the peripheral wall 15 is formed between a pair of adjacent ridges 21. Yes.

  As shown in FIG. 9, when 30 ridges 21 are formed on the outer diameter of the cap 5, the central angle θ formed by a pair of adjacent rising surfaces 22 and the central axis Z of the cap 5 is 12 °. is there. As an example of a numerical value, when the outer diameter of the cap 5 is 25 mm, the height from the outer surface (flat portion 24) of the peripheral wall 15 is 0.5 mm, and the thickness of the peripheral wall 15 (flat portion 24) depends on the material. 0.4 to 1.0 mm.

  FIG. 10 is a diagram illustrating a use state of the cap according to the second embodiment of the present invention, and corresponds to a state of the cap 5 as viewed from the top plate outer surface side.

  As shown in FIG. 10, the cap 5 according to the present embodiment is formed with a knurl 20 having a rising surface 21 rising in the radial direction and a flat surface 24 connected to the inner peripheral edge of the rising surface 21. Therefore, in the process of rotating the cap 5 in the counterclockwise direction (in the direction of the arrow) in FIG. 10 about the central axis Z and removing it from the spout, the finger 25 is interposed between the pair of adjacent ridges 21 by the flat surface 24. It is easy to enter and the finger 25 is easy to get on the rising surface 21. As a result, the anti-slip effect by the knurl 20 is improved, and the cap 5 can be easily opened even when the cap 5 is fastened to the spout with high torque.

  In the use of spout stoppers welded to paper containers, etc., the outer diameter of the cap 5 is about 20 to 30 mm and is not so large. Therefore, immediately after the cap 5 is molded, the cap 5 is forcibly pulled from the mold (male). In general, the cap 5 is removed from the molding apparatus by a process of separating the cap 5 into the molding apparatus (so-called “unreasonable”). As in the cap 5 of this embodiment, when the flat surface 24 is provided on the knurl 20 and the ridges 21 are arranged intermittently, the peripheral wall is compared with the case where the ridges 21 are provided without gaps in the circumferential direction of the cap 5. The rigidity of 15 portions can be reduced. In this case, the height of the ridge 21 (the height of the rising surface 22) can be increased by the amount that the rigidity is relaxed by the flat surface 24 without increasing the force required for unreasonableness. The cap 21 can be configured.

  Further, when the rigidity of the peripheral wall portion 15 is reduced as in the present embodiment, the deformation of the peripheral wall 15 after forcible removal and the crushing of the threads formed on the inner surface of the peripheral wall 15 can be reduced. In this case, it is possible to realize the cap 5 that is easy to open and close and that does not impair the feel during opening and closing.

  In the present embodiment, the number of ridges is specified, but the number of ridges may be arbitrary.

  In the present embodiment, the center angle corresponding to the ridge and the center angle corresponding to the flat portion are set to be substantially the same, but the ridge is relative to the center angle corresponding to the flat portion. The center angle corresponding to is larger.

  4-7 is a figure which shows the front-end | tip shape of the spout which concerns on Comparative Examples 1-4, and is equivalent to the end elevation seen from the plane which passes along the central axis of a spout. Hereinafter, Examples 1 and 2 and Comparative Examples 1 to 4 in which the present invention is specifically implemented will be described with reference to the drawings.

(Examples 1 and 2)
The spout according to Examples 1 and 2 has the shape shown in FIGS. 2 and 3, but the rigidity of the resin used is different. Specifically, the spout according to Example 1 was molded with medium-rigid LDPE, and the spout according to Example 2 was molded with high-rigidity resin.

(Comparative Example 1)
As shown in FIG. 4, the spout according to Comparative Example 1 is formed by straightening the end face of the side wall. The spout according to Comparative Example 1 is formed with a medium-rigid resin.

(Comparative Example 2)
As shown in FIG. 5, the spout according to Comparative Example 2 is formed by tapering the end face of the side wall and providing a taper whose diameter increases toward the open end on the inner face of the side wall. The spout according to Comparative Example 2 is formed with a medium-rigid resin.

(Comparative Example 3)
As shown in FIG. 6, the spout according to the comparative example 3 is provided with flange-shaped ridges on the outer peripheral edge of the open end of the side wall. The end face of the ridge is tapered, and the thickness of the ridge decreases as the distance from the central axis of the side wall increases. The spout according to Comparative Example 3 is formed from a highly rigid resin.

(Comparative Example 4)
As shown in FIG. 7, the spout according to Comparative Example 4 is provided with a rounded protrusion on the outer peripheral edge of the open end of the side wall. The end face of the ridge is formed in a substantially semicircular shape that is convex outward of the side wall. The spout according to Comparative Example 4 is formed from a medium-rigid resin.

<Liquidity>
A packaging container in which the spouts according to Examples 1 and 2 and Comparative Examples 1 to 4 were each welded to a paper container was prepared, filled with various liquids, and then a sample in which the packaging container was sealed was prepared. Open the spout of each prepared sample and pour out the contents. By visually confirming the open end of the spout, “○: No adhesion of the contents to the outer periphery of the open end, Δ: On the outer periphery of the open end” Evaluation was made in three stages: small amount of contents adhered, x: contents adhered to the outer peripheral portion of the open end.

  Table 1 is a matrix that summarizes the liquid breakage for each sample and content type. In the spouts according to Comparative Examples 1 to 4, there are many cases where a small amount of content adheres to the outer peripheral portion of the open end due to high-viscosity salted and grilled meat, sufficient for edible oil with higher viscosity Liquid drainage was not obtained. On the other hand, in the spout according to Examples 1 and 2, with respect to salty sauce with high viscosity, grilled meat sauce, it exhibits a liquid cutting property equal to or better than Comparative Examples 1 to 4, and for edible oil It was confirmed that excellent liquid drainage was exhibited.

<Capping aptitude>
For each of the spouts according to Example 1 and Comparative Example 1, a cap having the structure shown in FIG. 2 was capped using a 6-head air clutch capper. The capping conditions were low torque such that the opening torque was 20 to 25, and capping was performed at a rate of 100 pieces / minute. Thereafter, as the capping characteristics, the number of diagonal closures per 100 pieces and the number of insufficient cap closures were counted.

  Table 2 summarizes the number of diagonal closures and the number of insufficient cap closures for each spout according to Example 1 and Comparative Example 1. From the results shown in Table 1, it was confirmed that the ridges provided on the spout according to Example 1 can greatly improve oblique closing and insufficient closing by the capper.

  INDUSTRIAL APPLICATION This invention can be utilized as a spout stopper attached to the packaging container for packaging liquids, such as liquor, a drink, and a seasoning.

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Container main body 3 Outlet stopper 4 Spout 5 Cap 6 Side wall 11 Screw 12 Projection 14 Top plate 15 Perimeter wall 16 Screw 17 Inner ring 18 Tapered part

Claims (4)

A spout stopper attached to a liquid packaging container,
A spout having a cylindrical side wall and a ridge continuously provided on the outer peripheral edge of one end of the side wall;
A cap attached to the spout;
The cross section of the ridge in the radial direction of the spout is bent in the radial direction of the side wall after drawing a convex arc in which the distance from the side wall extends from the outer peripheral edge of the side wall toward the other end of the side wall. Having a shape defined by a contour line reaching the side wall;
A flat surface is provided at the one end of the side wall;
In a state of attaching the cap to the spout, the one said flat surface provided on an end of the side wall and said cap inner surface abut,
The inner surface of the one end of the side wall is provided with a taper whose inner diameter increases toward the one end side, and the thickness of the side wall decreases toward the one end side,
Inside the cap is provided an inner ring that contacts and fits the inner surface of the side wall in a state attached to the spout,
The spout stopper according to claim 1, wherein an outer diameter of the inner ring is larger than an inner diameter of the one end side portion of the side wall, and the inner ring is fitted into the side wall in a state in which the side wall is expanded . The cap has a top plate and a peripheral wall suspended from the outer peripheral edge of the top plate,
The spout stopper according to claim 1 , wherein an outer peripheral edge of the ridge and an inner surface of the peripheral wall are separated in a state where the cap is attached to the spout. The inside of the cap and the side wall outer surface of the spout are formed with screws that are screwed together,
The spout stopper according to claim 1 or 2 , wherein an outermost diameter of the ridge is equal to an inner diameter of a screw of the cap. A liquid packaging container,
A paper container body;
A packaging container provided with the spout stopper in any one of Claims 1-3 welded to the said container main body.

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