JP2004315017A - Plug for paper container for liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug for a paper container for liquid in which an adhesion part for sealing a spout and a cap is hardly welded by the ultrasonic oscillation energy when the plug is welded to a spouting position of the container by the ultrasonic sealing method. <P>SOLUTION: The plug comprises a spout 100 which is welded in a protruded manner by the ultrasonic sealing method at the spouting position of a paper container 20 for liquid, and a cap 200 which is screwed to the spout. In the spout, a spouting cylinder 120 is erected on an annular pedestal part 110 having a flange 140 circumferentially provided on an outer circumferential surface of a lower end thereof. In the cap 200, an inner seal ring 211 having an outer circumferential surface in close contact with an inner circumferential surface of a tip part of the spouting cylinder of the spout is vertically provided from a lower side of a top plate 210. A plurality of locking projecting parts 222 in touch with an upper surface of the annular pedestal part of the spout are vertically provided on a lower end face of a circumferential wall 220 in the circumferential direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spout for a liquid paper container, comprising a spout which is internally welded and projected by an ultrasonic sealing method at a pouring position of the liquid paper container and a cap which is screwed and mounted on the spout. It is.
[0002]
[Prior art]
Conventionally, for example, in a liquid paper container used for food or non-food liquid contents, in consideration of ease of use at the time of use, as shown in FIG. A liquid paper container (20) in which a spout (100) and a cap (200) comprising a spout (100) protrude from an inclined plate (22) at the top of a gable roof has been used over a wide range of applications. . This plug for a liquid paper container protrudes from the plug mounting hole (23) of the container (20), for example, like the plugs of Conventional Example 1 and Conventional Example 2 shown in FIG. The cap (200) is screwed onto the spout (120) of the spout (100) to be welded and welded. Ensuring perfect sealing and virginity during distribution or easy opening during use In order to combine the properties, usually a sealing plate (130) is provided below the inside of the spout pouring cylinder (120) for sealing and opening at the time of use. An annular V-shaped notch (131) is provided to form an annular thin line of weakness (132) at the expected opening position of the upper surface, and a pull ring is provided at one end of the upper surface near the inside of the annular thin line of weakness and at the tip. (133) with a support (133), When the spout is opened to open the spout, the cap (200) is unscrewed in the unscrewed direction and removed with a fingertip (134) housed inside the spout (120) of the spout (100). And pulled upward to tear open the thin annular weak line (132) of the sealing plate (130). After the spout was opened, the cap was screwed into the spout cylinder and resealed after use.
[0003]
The method for sealing the spout and the cap is such that the spout is placed on the lower surface of the top plate (210) of the cap (200) like the stopper (10) for the liquid paper container of the first conventional example shown in FIG. A contact sealing ring (212) for sealing the tip in close contact with the top surface of the spout cylinder (120) of (100), and an inner peripheral surface of the tip of the spout spout cylinder inside the contact sealing ring. A top plate of a cap (200), such as one having an inner sealing ring (211) vertically attached to the outer peripheral surface or a stopper (10) for a liquid paper container of a second conventional example shown in FIG. (210) An inner sealing ring (211) that closely contacts the outer peripheral surface is vertically provided on the inner peripheral surface of the tip end portion of the spout cylinder (120) of the spout (100), and the lower surface of the peripheral wall (220) is spouted when screwed. The upper surface of the annular pedestal portion (110) is tightly locked. There was.
[0004]
[Problems to be solved by the invention]
However, as shown in FIGS. 3 (a) and 3 (b), the above-mentioned conventional stopper for a liquid paper container is attached to the top inclined plate (22) of the container (20) (shown by a two-dot chain line). The spout tube (120) of the spout (100) into which the cap is screwed is projected into the hole (23), and the upper surface of the flange (140) provided on the outer peripheral surface of the lower end of the annular pedestal (110) and the top of the container When the inner surface of the inclined plate is welded to the inner surface by the ultrasonic sealing method (internal attachment), the welding conditions (amplitude, time, pressure, pressure, etc.) are generated by the ultrasonic vibration energy generated from the horn (30) (shown by a three-dot chain line). Depending on the temperature), in the plug (10) of the conventional example 1 shown in FIG. 3A, the tip of the contact sealing ring (212) of the cap (200) and the spouting tube (120) of the spout (100) can be used. Inner seal ring for cap (B) and cap The contact portion (C) between the outer peripheral surface of (211) and the inner peripheral surface of the tip of the spout pouring cylinder may be easily welded, and in the plug (10) of the second conventional example shown in FIG. The contact portion (C) between the outer peripheral surface of the inner sealing ring (211) of the cap (200) and the inner peripheral surface of the tip of the spout (120) of the spout (100), and the lower surface of the peripheral wall (220) of the cap. The contact portion (D) of the spout with the upper surface of the annular pedestal portion (110) may be easily welded, and if it is welded, the opening torque value when the cap is unscrewed may become large, making it difficult to open the cap.
[0005]
The present invention solves the above-mentioned problem of the conventional stopper for a liquid paper container, and when the container is welded to the pouring position of the container by an ultrasonic sealing method, the spout and the cap are sealed for sealing. The present invention provides a stopper for a liquid paper container which is hardly welded by ultrasonic vibration energy.
[0006]
[Means for Solving the Problems]
That is, the first invention of the present invention comprises a spout which is welded and projected at a pouring position of a liquid paper container by an ultrasonic sealing method, and a cap which is screwed and mounted on the spout. A spout cylinder is erected on an annular pedestal portion around which a flange is provided on the outer peripheral surface at the lower end, and the cap is tightly sealed to the inner peripheral surface at the tip end inner peripheral surface of the spout pouring cylinder on the lower surface of the top plate. A liquid paper container in which a ring is vertically provided, and a plurality of locking projections abutting on the upper surface of the annular pedestal portion of the spout are provided at equal intervals in a circumferential direction on a lower end surface of the peripheral wall. It is a mouth stopper.
[0007]
Next, a second invention of the present invention comprises a spout which is welded and projected by an ultrasonic sealing method at a pouring position of a liquid paper container, and a cap which is screwed and attached to the spout. However, a pouring cylinder is erected on an annular pedestal portion around which a flange is provided on an outer peripheral surface at a lower end, and the cap is screwed onto the upper surface of the annular pedestal portion when the cap is screwed from the outer periphery to the outer periphery of the pouring cylinder. Inner sealing in which a plurality of recesses in which the lower end surface of the peripheral wall does not abut are provided at equal intervals in the circumferential direction, and the cap is in close contact with the inner peripheral surface of the tip of the spout pouring cylinder on the lower surface of the top plate. A stopper for a liquid paper container wherein a ring is provided vertically.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 (a), 2 (a), and 4, the stopper (10) for a liquid paper container of the present invention is welded to the pouring position of the liquid paper container (20) by an ultrasonic sealing method. And a cap (200) which is screwed into and attached to the spout discharge tube (120). These members are made of polyethylene, polypropylene or the like according to the purpose. It is produced by an injection molding method using a thermoplastic resin.
[0009]
Next, an embodiment of a stopper for a liquid paper container according to the present invention will be described in detail with reference to the drawings.
FIG. 1A is a cross-sectional view illustrating the structure of the stopper for a liquid paper container according to the first embodiment, where a two-dot chain line indicates the container, and a three-dot chain line indicates the position of the horn during ultrasonic sealing. FIG. 1 (b) is a bottom view of the cap. FIG. 2A is a cross-sectional view showing the structure of the liquid paper container stopper of the second embodiment, and FIG. 2B is a cross-sectional view taken along line AA ′. FIG. 4 is a perspective view of an example of a liquid paper container with a stopper.
[0010]
As shown in FIGS. 1 (a) and 1 (b), the structure of the spout (100) of the stopper for a liquid paper container according to the first embodiment has a flange (140) provided on the lower peripheral surface and a plurality of flanges on the upper peripheral surface. A plurality of (usually four) temporary fixing protrusions (112) are provided at equal intervals in the circumferential direction. A male screw (121) with a cap is provided on the outer peripheral surface on the inner peripheral edge upper surface of the annular pedestal (110). A cylinder (120) is erected, and a sealing plate (130) is provided below the inside of the spouting tube for sealing, and an inverted V-shaped annular cut (131) is formed at a predetermined position on the lower surface of the sealing plate. ) To form an annular thin-walled weak line (132) at the expected opening position on the upper surface, and a column (133) having a pull ring (134) at its tip on a predetermined side of the upper surface near the inside of the annular thin-wall weakened line. Is to be erected. And the structure of the cap (200) consists of a top plate (210) and a peripheral wall (220). When the cap (200) is screwed onto the spout discharge tube, the outer peripheral surface is formed on the inner peripheral surface at the tip end of the spout discharge tube. An inner sealing ring (211) closely contacting the lower surface of the top plate (210) is vertically provided, a female screw (221) with a spout is provided on an inner peripheral surface of the peripheral wall (220), and an annular base of the spout is provided on a lower end surface of the peripheral wall. A plurality (usually, eight) of the locking projections (222) abutting on the upper surface of the part are vertically provided at equal intervals in the circumferential direction.
[0011]
Attachment of the liquid paper container spout (10) shown in FIG. 1 (a) of the first embodiment in which the cap is screwed onto the spout ejection tube described above to the liquid paper container (20) (shown by a two-dot chain line). First, the spout cylinder (120) of the spout (100) into which the cap (200) is screwed is projected from the stopper mounting hole (23) of the top inclined plate (22) of the container, and the annular pedestal is formed. Hook the four temporary fixing protrusions (112) provided on the outer peripheral surface of the upper end and temporarily fix them, and then, as shown in FIG. The horn (30) (shown by a three-dot chain line) of the ultrasonic sealing device is crimped, and the upper surface of the flange (140) and the inner surface of the container are welded by an ultrasonic sealing method. The stopper has a plurality of locking projections provided at equal intervals in the circumferential direction on the lower end surface of the peripheral wall of the cap. The upper surface of the annular pedestal portion of the spout comes into contact with the outer peripheral surface of the inner sealing ring of the cap and the inner peripheral surface of the upper end of the spout pouring cylinder. The tight contact between the outer peripheral surface of the inner sealing ring of the cap and the inner peripheral surface of the tip of the spout pouring cylinder due to the vibration energy of the sound wave can be prevented from being strongly welded. The contact area between the lower surface of each locking projection and the upper surface of the annular pedestal portion of the spout is extremely small as compared with the above-described prior art plug of the second example, and the peripheral wall of the cap due to ultrasonic vibration energy generated from the horn. It is possible to prevent the adhesion portion between the lower surface of the locking projection on the lower end surface and the upper surface of the annular pedestal portion of the spout from strongly welding.
[0012]
As shown in FIGS. 2 (a) and 2 (b), the structure of the spout (100) of the stopper for a liquid paper container according to the second embodiment is such that a flange (140) is provided on the lower peripheral surface and a plurality of flanges are provided on the upper peripheral surface. On a top surface of an inner peripheral edge of an annular pedestal portion (110) in which a plurality of temporary fixing protrusions (112) are provided at equal intervals in a circumferential direction, a pouring cylinder (120) in which a male screw (121) with a cap is provided on an outer peripheral surface. A plurality of (usually four) recesses that are wide in the circumferential direction from the outer circumference to the outer circumference of the dispensing cylinder, and do not contact the lower end surface of the peripheral wall of the cap when the cap is screwed, are equally spaced in the circumferential direction. It is provided. The concave portion is, of course, provided at a position on the outer peripheral surface where the temporary fixing protrusion is not provided. Further, a sealing plate (130) is provided below the inside of the pouring cylinder for sealing, and an annular cut (131) having a vertical V-shaped inverted cross section is provided at a predetermined position on the lower surface of the sealing plate to open the upper surface. An annular thin-walled weak line (132) is formed at a position, and a column (133) having a pull ring (134) at its tip is erected on a predetermined side of the upper surface near the inside of the annular thin-wall weakened line. And the structure of the cap (200) consists of a top plate (210) and a peripheral wall (220). When the cap (200) is screwed onto the spout discharge tube, the outer peripheral surface is formed on the inner peripheral surface at the tip end of the spout discharge tube. An inner sealing ring (211) closely contacting with the spout is provided vertically on the lower surface of the top plate (210), and a female screw (221) with a spout is provided on the inner peripheral surface of the peripheral wall (220).
[0013]
The attachment of the stopper (10) for the liquid paper container shown in FIG. 2 (a) to the liquid paper container (20) of the second embodiment in which the cap is screwed onto the spout discharge tube described above is the same as in the first embodiment. Then, the spout cylinder (120) of the spout (100) into which the cap is screwed is protruded from the stopper mounting hole (23) of the top inclined plate (22) of the container, so that the outer peripheral surface of the upper end of the annular pedestal portion is formed. The four temporary fixing protrusions (112) provided are hooked and temporarily fixed, and then the horn (30) of the ultrasonic sealing device (indicated by a three-dot chain line) is provided on the upper surface of the outer peripheral edge of the spigot mounting hole of the container. The upper surface of the flange (140) and the inner surface of the container are welded by an ultrasonic sealing method, and the cap of the present embodiment has a spout having an annular pedestal with a lower end surface of a spout. Abut the upper surface of the cap without the concave portion, and The surface and the inner peripheral surface of the upper end of the spout pouring cylinder are properly maintained, and the ultrasonic vibration energy generated from the horn is used to discharge the spout and the outer peripheral surface of the inner sealing ring of the cap. The contact area between the lower end surface of the peripheral wall of the cap and the upper surface of the spout annular pedestal portion, which is not provided with the concave portion, can be prevented from being strongly welded to the contact portion with the inner peripheral surface of the distal end portion of the cylinder. It is extremely small in comparison with the spout, and it is possible to prevent strong adhesion between the lower end surface of the peripheral wall of the cap and the upper surface of the annular pedestal portion of the spout due to the vibration energy of the ultrasonic waves generated from the horn.
[0014]
【The invention's effect】
The stopper for the liquid paper container of the present invention is appropriately maintained in close contact with the outer peripheral surface of the inner sealing ring provided on the lower surface of the top plate of the cap and the inner peripheral surface of the upper end portion of the spout pouring cylinder. Since the contact area between the lower end surface of the peripheral wall of the cap and the upper surface of the annular pedestal portion of the spout is relatively small, when the upper surface of the flange and the inner surface of the container are welded by the ultrasonic sealing method, the ultrasonic waves generated from the horn are removed. Since the vibrating energy does not strongly weld the contact portion for sealing the cap and the spout, the opening torque value at the time of unscrewing is appropriate and the plug is easily opened.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing a structure of a stopper for a liquid paper container according to a first embodiment of the present invention, wherein a two-dot chain line indicates a container, and a three-dot chain line indicates a horn of an ultrasonic seal. (B) is a bottom view of the cap.
FIG. 2 (a) is a cross-sectional view showing the structure of a liquid paper container stopper according to a second embodiment of the present invention, wherein a two-dot chain line indicates a container, and a three-dot chain line indicates a horn of an ultrasonic seal. FIG. 2B is a sectional view taken along line AA ′ of FIG.
FIG. 3A is a cross-sectional view illustrating a structure of a liquid paper container spout of Conventional Example 1, and FIG. 3B is a cross-sectional view illustrating a structure of a liquid paper container spout of Conventional Example 2. is there. The two-dot chain line indicates the container, and the three-dot chain line indicates the position of the horn during ultrasonic sealing.
FIG. 4 is a perspective view of an example of a liquid paper container with a stopper.
[Explanation of symbols]
10 Plug 20 Container 21 Body 22 Inclination plate 23 Plug mounting hole 30 Horn 100 Spout 110 Ring base 111 Concave 112 Temporary fixing protrusion 120: Discharge cylinder 121: External thread 130: Closing plate 131: Annular cut 132: Annular thin-wall weakened line 133: Strut 134: Pull ring 140: Flange 200: Cap 210: Top plate 211 ... inner sealing ring 212 ... contact sealing ring 220 ... peripheral wall 221 ... female screw 222 ... locking projections B, C, D ... contact parts

Claims (2)

A spout welded to the pouring position of the liquid paper container by ultrasonic sealing and projected from the spout, and a cap screwed onto the spout and attached to the spout, wherein the spout is provided with a flange around the lower end outer peripheral surface. An injection cylinder is erected on the pedestal portion, and the cap has an inner sealing ring vertically attached to the inner peripheral surface at the tip end portion of the spout injection cylinder on the lower surface of the top plate, and the cap is provided below the peripheral wall. A stopper for a liquid paper container, wherein a plurality of locking projections abutting on an upper surface of an annular pedestal portion of the spout are vertically provided on an end surface at equal intervals in a circumferential direction. A spout welded to the pouring position of the liquid paper container by ultrasonic sealing and projected from the spout, and a cap screwed onto the spout and attached to the spout, wherein the spout is provided with a flange around the lower end outer peripheral surface. A pouring cylinder is erected on the pedestal portion, and a plurality of recesses on the upper surface of the annular pedestal portion, where the lower end surface of the peripheral wall of the cap does not abut when the cap is screwed from the outer periphery to the outer periphery of the pouring cylinder. Liquid paper provided at equal intervals in the circumferential direction, and wherein the cap has an inner sealing ring vertically attached to the inner peripheral surface at the tip end portion of the spout discharge cylinder on the lower surface of the top plate. Cap for container.

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