JP2004042949A - Stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stopper, whose sealing capability is high while a cap can be screwed firmly on a spout with a weak tightening torque and be screwed off the spout with a weak opening torque. <P>SOLUTION: The stopper 10 comprises the spout 200 formed projectingly at an outlet of a container, and the cap 100 screwed on the spout 200. On the under surface of the top plate 110 of the cap 100, an inner sealing ring 112 is provided with the outer circumferential surface of the ring 112 closely attached to the front end inner circumferential surface of an outlet cylinder 210 of the spout 200. Near the upper end of the outer circumferential surface of the inner sealing ring 112, a contact sealing ring 111 is provided with the lower extremity of the ring 111 closely attached to the upper surface of the outlet cylinder 210 and outside of a center line L in the direction of the width of the outlet cylinder 210. On the upper end of the inner surface of the circumferential wall of the cap 100, an outer contact ring 122 is provided with a prescribed gap formed between the ring 122 and the upper end outer circumference of the outlet cylinder 210. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The spout of the present invention relates to a spout (spout device) projecting from a pouring position of a container used for a liquid content, and a cap screwed onto the spout.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, containers used for liquid contents such as foods and non-foods have been designed in consideration of ease of use, for example, as shown in FIG. A liquid paper container (20) in which a cap (100) and a spout (10) comprising a spout project from a roof-shaped inclined plate (22) at the top has been used over a wide range of applications. As shown in FIG. 4, for example, as shown in FIG. 4, a spout (200) spout cylinder (210) is provided on the lower surface of the top plate (110) of the cap (100). )), And an inner sealing ring (112) having an outer peripheral surface in close contact with the inner peripheral surface of the distal end portion of the spout pouring cylinder inside the contact sealing ring. And the upper end of the spout pouring cylinder is sealed in two stages.
[0003]
[Problems to be solved by the invention]
However, in the above conventional plug, when the cap is screwed into the spout, the cap may be screwed with a strong closing torque in order to sufficiently seal the spout, and the cap is unscrewed from the spout. Occasionally, a strong opening torque force was required, and the cap was difficult to screw off the spout. However, when the cap was screwed with a weak torque, the sealing was sometimes insufficient.
[0004]
The present invention has solved the above-mentioned problem of the conventional plug, and can stably screw the cap to the spout with an appropriate low closing torque, and can unscrew the cap from the spout with an appropriate low opening torque, Moreover, the present invention provides a plug with good sealing properties.
[0005]
[Means for Solving the Problems]
That is, the first invention of the present invention provides a spout projecting at a pouring position of a container and a cap comprising a cap screwed onto the spout, wherein the spout pouring cylinder is provided on a lower surface of a top plate of the cap. An inner sealing ring that closely contacts the outer peripheral surface is provided on the inner peripheral surface of the distal end of the spout.A lower end distal end is in close contact with an upper surface of the spout discharge tube adjacent to an outer peripheral upper end of the inner sealing ring. An outer contact ring provided with a contact sealing ring outside the center line in the width direction, and a predetermined gap provided at the upper end of the inner peripheral surface of the peripheral wall of the cap with the outer periphery of the upper end of the spout discharge tube; It is a mouth plug characterized by providing.
[0006]
In the second invention of the present invention, the gap provided between the outer abutment ring of the cap and the outer periphery of the upper end of the spout pouring cylinder is such that the gap between the female screw of the cap and the male screw of the spout is formed. The plug according to the first invention, wherein the distance between the plug and the tip of the thread is smaller.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the plug of the present invention will be described in detail with reference to the drawings.
FIG. 1A is a cross-sectional view showing a main part of a plug according to an embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view of a main part of the sealing structure. 2A and 2B are explanatory views showing the sealing structure of the plug of FIG. 1, and FIG. 2A shows a case where the degree of fitting of the spout of the inner sealing ring of the cap to the spouting tube opening of the spout is large, and FIG. (C) is the case where the degree of fitting of the spout of the inner sealing ring of the cap to the spout cylinder portion of the spout is small, and (c) is the case where the closing torque value of the cap to the spout is high. FIG. 3 is a perspective view of an example of a liquid paper container with a plug.
[0008]
The spout of the present invention is a spout comprising a spout protruding from a pouring position such as a liquid paper container (20) shown in FIG. 3 or a pouch of a soft packaging material, and a cap screwed onto the spout. is there. The spout is usually produced by an injection molding method using a thermoplastic resin such as polyethylene, and the cap is usually produced by an injection molding method using a thermoplastic resin such as polypropylene.
[0009]
As shown in FIG. 1 (a), the structure of the spout (10) according to one embodiment of the present invention is such that a spout (200) spout cylinder (210) is provided on the lower surface of the top plate (110) of the cap (100). An inner sealing ring (112) that closely contacts the outer peripheral surface (inclined surface that opens upward) is provided on the inner peripheral surface of the distal end of the inner sealing ring. A contact sealing ring (111) which is in close contact with the upper surface and whose lower end is outside the center line (L) in the width direction shown in FIG. 1 (b) is provided, and the upper end of the inner peripheral surface of the peripheral wall (120) of the cap. In addition, an outer contact ring (122) is provided by providing a predetermined gap (d) with the outer periphery of the upper end of the spout pouring cylinder. A female screw (121) with the spout is provided on the inner peripheral surface of the peripheral wall of the cap, and a male screw (211) with the cap is provided on the outer peripheral surface of the spout cylinder. In addition, the outer contact ring (122) of the cap and the outer periphery of the upper end of the spout pouring cylinder (210) are usually formed on inclined surfaces facing each other as shown in FIG. 1 (a). It is.
[0010]
As shown in FIG. 1A, a gap (d) provided between the outer contact ring (121) of the cap (100) and the outer periphery of the upper end portion of the spouting tube (210) of the spout (200) is formed by a cap. Is smaller than the distance (D) between the root of the female screw (121) and the tip of the thread of the male screw (211) of the spout. That is, it is provided to be smaller than half the difference between the root diameter of the female screw of the cap and the outer diameter of the male screw of the spout.
[0011]
In the spout of the present invention, when the outer diameter of the inner sealing ring of the cap with respect to the inner diameter of the upper end portion of the spout discharging cylinder is considerably large, and the fitting margin of the inner sealing ring is large, FIG. As shown in (2), the inner sealing ring (112) is inclined inward (arrow), so that the tip of the contact sealing ring (111) presses the top surface of the spout (200) pouring cylinder (210). Arrow) becomes stronger. This synergistic effect improves the degree of sealing.
[0012]
Further, when the outer diameter of the inner sealing ring of the cap is not so large with respect to the inner diameter of the upper end portion of the spout discharge tube, and the fitting margin of the inner sealing ring is small, as shown in FIG. The force (arrow) at which the tip of the contact sealing ring (111) spreads outward, and the force (the outer peripheral surface of the inner sealing ring (111) presses the inner peripheral surface at the upper end of the spout cylinder (210) of the spout (200)) Arrow) becomes stronger. This synergistic effect improves the degree of sealing.
[0013]
In addition, when the cap is tightened with a strong closing torque when the cap is screwed onto the spout ejection tube, the spout ejection tube is tilted outward, but in the spout of the present invention, the spout of FIG. As shown in the figure, the outer peripheral surface of the upper end portion of the spout discharging cylinder is formed on the inner peripheral surface of the peripheral wall of the cap within a range in which the contact sealing ring and the inner sealing ring seal the upper end of the spout discharging tube well. The abutment ring provided at the upper end of the spout comes into contact with the outer contact ring, whereby the spout ejection cylinder stops tilting. This prevents the cap from being tightly closed by the spout, and the gap provided between the outer abutment ring of the cap and the outer periphery of the upper end of the spout pouring cylinder is formed by the gap between the female screw valley of the cap and the spout Since the distance from the screw thread tip is smaller than the screw thread tip of the spout's male thread, the thread tip of the male screw of the spout does not come into contact with the valley of the female thread of the cap. do not need.
[0014]
【The invention's effect】
The spout of the present invention comprises a spout and a cap screwed onto the spout, and is used by being protruded from a pouring position of a liquid paper container or a pouch of a soft packaging material. An outer contact ring is provided at the upper end of the inner peripheral surface of the peripheral wall of the cap, and by the action of the outer contact ring, the cap can be stably screwed to the spout with an appropriate low closing torque. The cap can be screwed out of the spout with an appropriate low opening torque. Further, the cap screwed to the spout with an appropriate closing torque seals the spout satisfactorily with the contact sealing ring and the inner sealing ring.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing a main part of a plug according to an embodiment of the present invention, and FIG. 1B is an enlarged cross-sectional view of a main part of the sealing structure.
FIG. 2 is an explanatory view showing a sealing structure of the spout of FIG. 1; FIG. 2 (a) shows a case where a degree of fitting of a spout of an inner sealing ring of a cap to a spouting tube opening of a spout is large; (C) is a case where the degree of fitting of the spout of the inner sealing ring of the cap to the spout cylinder opening portion is small, and (c) is a case where the tightening torque value of the cap to the spout is high.
FIG. 3 is a perspective view of an example of a liquid paper container with a stopper.
FIG. 4 is a cross-sectional view showing a main part of a conventional sealing structure for a plug.
[Explanation of symbols]
10 Plug 20 Liquid paper container 21 Body 22 Slant plate 100 Cap 110 Top plate 111 Contact seal ring 112 Inner seal ring 120 Peripheral wall 121 ... female screw 122 ... outer contact ring 200 ... spout 210 ... pouring cylinder 211 ... male screw D, d ... gap L ... center line

Claims (2)

In a spout consisting of a spout protruding at a pouring position of a container and a cap screwed to the spout, an outer peripheral surface is closely contacted with an inner peripheral surface of a tip end portion of the spout pouring cylinder on a lower surface of a top plate of the cap. An inner sealing ring is provided, the lower end of which is in close contact with the upper surface of the spout discharge tube adjacent to the outer peripheral upper end of the inner sealing ring, and the lower end of which is outside the center line in the width direction. A spout provided with a stop ring and an outer abutment ring provided at a top end of an inner peripheral surface of a peripheral wall of the cap with a predetermined gap from an outer periphery of an upper end of the spout discharging cylinder. The gap provided between the outer abutment ring of the cap and the outer periphery of the upper end of the spout pouring cylinder is smaller than the distance between the valley of the female screw of the cap and the tip of the thread of the male screw of the spout. The spout according to claim 1, wherein

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