JP2008013239A - Spout, and paper container for liquid, which is attached with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spout and paper container for liquid, which is attached with the same free from such problems that an annular incision is broken when welded to the paper container, or a pouring cylinder of the spout and a cap are welded to each other. <P>SOLUTION: The cap (20) is provided with an inner sealing ring (22), on the undersurface of its ceiling panel (21), whose outer peripheral surface comes into tight contact with the inner peripheral surface, in the vicinity of the end portion (141) of the spout (10), and is so constructed that a cap thread-engagement part (27) is formed on the inner peripheral surface of the cap peripheral wall, which is thread-engaged with a thread engagement part (13) provided on the outer peripheral surface of the pouring cylinder (14), while the vicinities of the end of the outer peripheral surface of the inner sealing ring is so formed as to be circumferentially equipped with a protrusion (26) gently projecting outward, and the wall thickness of the pouring cylinder section coming into close contact with the inner sealing ring is made equal to or thinner compared with the wall thickness of the inner sealing ring. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid paper container stopper comprising a spout projecting from the top of the container by heat sealing by an ultrasonic sealing method and a cap screwed to the spout, and a liquid paper container having the stopper attached thereto. About.

  Conventionally, in a liquid paper container used for liquid contents of food and non-food, in consideration of ease of use at the time of use, for example, as shown in FIG. The liquid paper container (2) with a spout (10) and a cap (1) made of a spout (10) and a cap (20) at the pouring position of the inclined plate (4) at the top of the gable roof type is widely used. Has been.

  As the cap (20) of the spigot (1), when sealing performance is particularly required, for example, as shown in FIG. 4, an outer peripheral surface is provided on the lower surface of the top plate (21) of the cap (20). An inner sealing ring (22) that is in close contact with the inner peripheral surface of the tip of the spout tube (14) of the spout (10), and a tip on the top surface of the spout pipe (14) on the outside of the inner sealing ring And an outer sealing ring (25) which is in close contact with the outer peripheral surface of the tip of the spout tube of the spout is provided on the peripheral wall (24) of the cap. A device that protrudes inwardly on the inner peripheral surface of the upper end portion and seals the three portions of the upper end portion of the spout pipe (14) has been used (for example, see Patent Document 1).

The said prior art document is shown.
JP 2004-051126 A.

  However, since the inner sealing ring (22) is relatively short and thick, the tip portion (141) of the dispensing cylinder is spread outward during capping, and the spout closure plate (15) is cap ( 20), and the dispensing cylinder (14) is bent inward. For this reason, since the airtightness is very high but the residual stress is high, the annular notch (16) is cut at the time of fusing to the paper container inclined plate (4), or the dispensing cylinder (14) and the cap (20) are fused. There was something to do.

  A structure that avoids the problem due to the fusion is also used, but the problem that the liquid sealing performance is inferior remains though the problem of the fusion is reduced because the pouring tube is creep-deformed outward as in the case described above.

  The present invention has been made in view of the above-described problems relating to the stopper of a liquid paper container comprising a spout that is thermally fused to the top of the container by an ultrasonic sealing method and a cap that is screwed to the spout. Therefore, it is an object of the present invention to provide a spigot in which an annular cut is not cut at the time of fusing to a paper container, and a pouring tube and a cap are not fused, and a liquid paper container to which the spigot is attached.

According to a first aspect of the present invention, there is provided a plug comprising a spout protruding from a plug mounting hole of a liquid paper container and a cap screwed onto the spout.
The spout is provided with a pouring tube standing on the outer peripheral surface of the upper peripheral surface of the pedestal ring having a sticking ring on the outer peripheral surface of the lower end. A closing plate is provided on the inner surface and the inner side is sealed, and an annular cut is provided at a predetermined position of the closing plate to form an annular thin fragile line, on one side of the upper surface near the inner side of the annular thin fragile line , Consisting of a structure in which a pillar having a pull ring at the tip is erected,
The cap is provided with an inner sealing ring whose outer peripheral surface is in close contact with the inner peripheral surface near the tip of the spout tube of the spout on the lower surface of the top plate, and the inner peripheral surface of the peripheral wall of the cap has It has a structure in which a screwing portion provided on the outer peripheral surface and a cap screwing portion that can be screwed are formed,
The vicinity of the tip of the outer peripheral surface of the inner sealing ring has a shape in which a protruding portion that protrudes gently outward is provided around the inner sealing ring. The plug is characterized in that it is equal or thinner than the thickness of the retaining ring.

  As described above, according to the first aspect of the present invention, in the spigot comprising the spout protruding from the spigot mounting hole of the liquid paper container and the cap screwed onto the spout, the spout is: A pouring tube having a threaded portion with a cap on the outer peripheral surface is erected on the inner peripheral edge of the upper surface of the pedestal ring having an adhesive ring around the lower end outer peripheral surface, and closed on the lower inner surface of the pouring tube A plate is provided and the inside is sealed, and an annular cut is provided at a predetermined position of the closing plate to form an annular thin fragile wire, and a pull ring at the tip is formed on one side of the upper surface near the inside of the annular thin fragile wire. The cap is provided with an inner sealing ring in which the outer peripheral surface is in close contact with the inner peripheral surface near the tip of the spout tube of the spout on the lower surface of the top plate. Provided on the outer peripheral surface of the dispensing tube on the inner peripheral surface of the peripheral wall And a cap screwed portion that can be screwed together, and a protruding portion that protrudes gently outward is provided in the vicinity of the tip of the outer peripheral surface of the inner sealing ring. As the shape and the thickness of the portion of the pipe that is in close contact with the inner sealing ring are equal to or thinner than the thickness of the inner sealing ring, only the inner sealing ring will spread outward. By doing so, stress does not affect other parts, and by sealing at the tip of the inner sealing ring, the inner sealing ring is easily bent inward, and the cap resin has high rigidity. Creep deformation is difficult, and the mouth part is also partially deformed so that the sealing performance does not deteriorate.

  The invention of claim 2 is a liquid paper container to which the cap of claim 1 is attached by heat fusion.

  Thus, the plug of the present invention eliminates the problem of heat-sealing to the top of the container, and can be a plug with a high ultrasonic sealing property.

The present invention will be described in detail below based on one embodiment.
For example, as shown in FIG. 5, the spigot of the present invention includes a spout (10) protruding from a spigot attachment hole of the liquid paper container (2), and a cap (fitting to the spout by being screwed into the spout (10). 20). The spout (10) and the plug (20) are produced by an injection molding method using a thermoplastic resin having an appropriate rigidity such as polypropylene.

  The structure of the spout (10) is as follows. That is, a pour cylinder (10) on the outer peripheral surface having a threaded portion (13) with the cap (20) on the inner peripheral edge of the upper surface of the pedestal ring (12) having the sticking ring (11) provided on the outer peripheral surface of the lower end. 14) is erected.

  A closing plate (15) is provided on the lower inner surface of the dispensing tube (14) to seal the inside, and an annular cut having an inverted V-shaped cross section or a V-shaped cross section is formed at a predetermined position of the closing plate (15). (16) is provided, and an annular thin line of weakness (17) is formed on the opposite surface side.

It has a structure in which a column (19) having a generally circular or elliptical pull ring (18) is erected on one side of the upper surface in the vicinity of the inside of the annular thin weak line (17). Yes (see FIG. 2).

  The structure of the cap (20) is as follows. That is, an inner sealing ring (22) whose outer peripheral surface is in close contact with the inner peripheral surface in the vicinity of the extraction tube tip (141) of the spout (10) is provided on the lower surface of the top plate (21).

  The inner peripheral surface of the peripheral wall (24) of the cap has a structure in which a screwing portion (13) provided on the outer peripheral surface of the dispensing tube and a cap screwing portion (27) that can be screwed are formed. is there.

  The vicinity of the distal end portion of the outer peripheral surface of the inner sealing ring (22) has a shape in which a protruding portion (26) that gently protrudes outward is provided around the inner sealing ring (22), and is in close contact with the inner sealing ring (22). The thickness of the dispensing tube (14) is equal to or thinner than the thickness of the inner sealing ring (22) (see FIG. 1).

  A more specific example is as follows: Cap outer diameter (a): 24.7 mm, pour cylinder diameter (b): 18.4 mm, inner seal ring height (c): 5 mm, inner seal The maximum thickness (d) of the stop ring: 0.7 mm (in the line (e) 1 mm inside the tip edge of the inner sealing ring), and the thickness (f) of the dispensing cylinder: 0.6 mm (FIG. 3) reference).

  By adopting such a structure, when the spout is heat-sealed to the top of the paper container by the ultrasonic sealing method, the annular notch of the closing plate may be cut or the dispensing cylinder and the cap may be fused. It became a plug with high sealing performance.

FIG. 6 is a cross-sectional explanatory view showing an embodiment when the stopper of the present invention is projected from the stopper mounting hole of the liquid paper container. It is sectional explanatory drawing which shows one Example of the spout of the spigot of this invention. It is principal part sectional explanatory drawing which shows one Example of the thickness relationship between the inner sealing ring of the cap of this invention, and the extraction pipe | tube of a spout. It is sectional explanatory drawing which shows one Example when the conventional stopper is protrudingly provided in the stopper attachment hole of the liquid paper container. It is perspective explanatory drawing of the liquid paper container of an example which attached the stopper to the top inclination board by heat sealing | fusion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mouth stopper 2 ... Liquid paper container 3 ... Body part 4 ... Inclined plate 10 ... Spout 11 ... Sticking ring 12 ... Base ring 13 ... Screwing part 14 ... Dispensing cylinder 15 ... ··· Closed plate 16 ··································································· 18 Pull ring 19 ······································ 25 ··· Outer sealing ring 26 ··· Raised portion 27 ··· Cap screwed portion 141 ··· Discharged tube tip

Claims (2)

In a spout composed of a spout projecting from a spout attachment hole of a liquid paper container and a cap that is screwed into the spout and attached thereto,
The spout is provided with a pouring tube standing on the outer peripheral surface of the upper peripheral surface of the pedestal ring having a sticking ring on the outer peripheral surface of the lower end. A closing plate is provided on the inner surface and the inner side is sealed, and an annular cut is provided at a predetermined position of the closing plate to form an annular thin fragile line, on one side of the upper surface near the inner side of the annular thin fragile line , Consisting of a structure in which a pillar having a pull ring at the tip is erected,
The cap is provided with an inner sealing ring whose outer peripheral surface is in close contact with the inner peripheral surface near the tip of the spout tube of the spout on the lower surface of the top plate, and the inner peripheral surface of the peripheral wall of the cap has It has a structure in which a screwing portion provided on the outer peripheral surface and a cap screwing portion that can be screwed are formed,
The vicinity of the tip of the outer peripheral surface of the inner sealing ring has a shape in which a protruding portion that protrudes gently outward is provided around the inner sealing ring. A spigot characterized by being equal or thinner than the wall thickness of the retaining ring.   A liquid paper container to which the cap according to claim 1 is attached by heat fusion.

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