JP4161549B2 - Cap for liquid paper container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stopper for a liquid paper container in which a cap is screwed into a spout projecting at a pouring position of a liquid paper container to be filled with contents at high temperature. The present invention relates to a plug for a liquid paper container that does not allow cooling water to enter.
[0002]
[Prior art]
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. A liquid paper container (20) in which a cap (10) made of a cap (100) and a spout (200) protrudes from a sloped plate (22) at the top of a gable roof has been used over a wide range of applications. It was. This cap is made by screwing a cap onto a spout tube that protrudes from the cap mounting hole of the container. Normally, it is necessary to ensure completeness of sealing and virginity during distribution, or during use. For example, as shown in FIG. 4, a sealing plate (230) is provided on the lower inner surface of the spout tube (220) inside the spout (200) and sealed, and is opened during use. Therefore, an annular notch (231) having an inverted V-shaped vertical cross section is provided at a predetermined position on the lower surface of the sealing plate, and an annular thin line of weakness (232) is formed at a predetermined opening position on the upper surface. A column (233) having a pull ring (234) at the tip is erected on a predetermined side of the upper surface near the inside, and the cap (100) is removed when opening the cap to open the container. , Spout (200) pour tube Pulling upward over the finger tip to pull ring (234) which is housed inside the 220), it was opened tore thin annular line of weakness (232) of the blocked plate (230). In addition, after using the spout which opened, the cap was screwed and attached to the extraction pipe | tube, and it resealed.
[0003]
[Problems to be solved by the invention]
By the way, when the contents are food, the contents are filled in a liquid paper container at a high temperature as necessary. For example, in the case of non-alcohol, it is filled at 90 ° C. or higher, and immediately after that, the container is cooled by shower with cooling water and lowered to room temperature. In this cooling process, for example, the cooling water flows from the bottom of the cap (100) of the plug (10) of FIG. 4 due to a vacuum phenomenon caused by a rapid temperature change in the plug due to cooling of the plug. It may enter the gap of the spout (200). However, the conventional liquid paper container cap is generally completely free from the ingress of cooling water in this cooling step. In order to automatically remove the cooling water that has entered the gap between the cap and the spout, there is a spout with a vertical groove on the thread of the spout to provide a drainage groove. In some cases, however, the cooling water once enters the inside of the plug even if it is automatically drained.
[0004]
The present invention solves the above-described problems of conventional liquid paper container caps, and cooling water permeates from the bottom of the cap into the inside of the cap in the shower cooling process after filling the contents with high temperature. It is an object of the present invention to provide a liquid paper container stopper.
[0005]
[Means for Solving the Problems]
A first invention of the present invention comprises a spout and a cap that is screwed to the spout. The spout is provided with a position guide rib on the outer peripheral edge of the upper surface of the pedestal ring, and a dispensing cylinder is provided on the inner peripheral edge of the upper surface. The cap is provided with a step at the inner peripheral edge of the lower end of the peripheral wall, and a contact sealing ring with a vertical cross-sectional shape of an inverted right triangle, a vertical surface inside, and an acute angle at the inner peripheral edge of the step. When the cap is screwed onto and attached to the spout, the contact sealing ring that hangs on the inner peripheral edge of the lower end of the peripheral wall of the cap is an outer peripheral edge on the upper surface of the pedestal ring of the spout The inclined outer peripheral surface is fitted to the upper inner peripheral surface of the position guide rib provided on the cap, and the tip of the contact sealing ring of the cap is in close contact with the outer peripheral edge of the upper surface of the base ring of the spout. A liquid feed container spout, characterized in.
[0006]
The second invention of the present invention is based on the first invention, characterized in that the height of the contact sealing ring suspended from the inner peripheral edge of the lower end of the peripheral wall of the cap is 0.2 mm or more. It is a stopper for liquid paper containers as described.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a liquid paper container cap of the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view of a liquid paper container cap according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a portion A in FIG. 1, and FIG. 3 is an example of liquid paper with a cap. It is a perspective view of a container.
[0008]
As shown in FIG. 3, for example, the stopper (10) for the liquid paper container according to the embodiment of the present invention has a trunk (21) on the top inclined plate (22) of the liquid paper container (20) having a square cylindrical shape. A spout (200) that is heat-sealed by an ultrasonic sealing method or the like and a cap (100) that is screwed onto the spout (100), and the cap (100), as shown in FIG. Contact sealing ring (111) for sealing the spout on the lower surface of the plate (110) (the tip is in close contact with the top surface of the spout mouth) and an inner sealing ring (112) on the inside (the outer peripheral face is inside the spout mouth) 2) and has a threaded portion (121) with a spout on the inner peripheral surface of the peripheral wall (120), and as shown in FIG. A step is provided at the peripheral edge, and the vertical cross-sectional shape is inclined to the inner peripheral edge of the step. As shown in FIG. 1, the spout (200) is attached to the outer periphery of the lower end as shown in FIG. The inner periphery of the upper surface of the pedestal ring (210) in which the flange (240) to be fused is provided, the position guide rib (212) is provided at the outer periphery of the upper surface, and the temporary fixing protrusion (211) is provided at a predetermined height on the outer periphery. In addition, a pouring cylinder (220) having a threaded portion (221) with a cap on the outer peripheral surface is erected, and a sealing plate (230) is provided and sealed at the inner lower side of the pouring cylinder. An annular notch (231) having an inverted V-shaped vertical cross section from the lower surface is provided at the planned opening position of the lower surface, and an annular thin wall weak line (232) is formed on the upper surface. On one side, a strut (23 that connects the pull ring (234) to the tip ) It is intended to erected. The annular thin line of weakness may be formed by forming an annular cut having a V-shaped vertical cross section from the upper surface of the sealing plate, and forming the annular thin line of weakness on the lower surface. The spout is usually made by an injection molding method using a thermoplastic resin such as polyethylene, and the cap is usually made of a thermoplastic resin such as polypropylene having a hardness higher than that of the spout.
[0009]
Note that a step is provided at the inner peripheral edge of the lower end of the peripheral wall of the cap of the cap for the liquid paper container, and the height of the contact sealing ring provided at the inner peripheral edge of this step is 0 in view of the degree of close contact with the spout. Although it should just be 2 mm or more, 0.2-0.6 mm is usually preferable from a practical viewpoint.
[0010]
Further, the liquid paper container cap of the present invention has a contact sealing ring suspended from the inner peripheral edge of the lower end of the peripheral wall of the spout when the cap is screwed onto the spout. Unlike the conventional spigot, the peripheral wall opens to the outside as the cap is screwed to the spout, because the inclined outer peripheral surface is fitted to the upper inner peripheral surface of the position guide rib provided on the outer peripheral edge of the upper surface while sliding. Therefore, the tip of the contact sealing ring always stays at a fixed position on the upper surface of the pedestal ring of the spout and does not cause misalignment. The tip of the contact sealing ring suspended from the inner peripheral edge of the lower end of the peripheral wall of the cap differs depending on the hardness difference between the spout material and the cap material, but it is 0 on the upper surface of the outer peripheral edge of the base ring of the spout. Deform about 15 mm, or bite into the upper surface of the outer peripheral edge of the spout pedestal ring about 0.15 mm so that the tip of the cap contact sealing ring is completely on the upper surface of the outer peripheral edge of the spout pedestal ring Closely. As a result, the cooling water does not enter the cap from the skirt of the cap in the cooling process.
[0011]
In the cap for a liquid paper container of the present invention, when the cap is screwed to the spout, the outer peripheral surface of the contact sealing ring at the inner peripheral edge of the peripheral wall end of the cap is outside the upper surface of the pedestal ring of the spout. Since it is in close contact with the upper inner peripheral surface of the position guide rib at the peripheral edge portion, the peripheral wall of the cap does not open to the outside, and the opening torque force of the cap becomes almost constant, making it easy to handle during use. Further, the sliding contact force between the cap's female screw and the spout's male screw is alleviated because the peripheral wall of the cap does not open to the outside, and no powder is generated due to sliding contact wear in the capping process. Moreover, since sealing with respect to the spout is performed at a plurality of positions by the sealing ring on the lower surface of the top plate of the cap and the sealing ring on the inner peripheral edge of the lower end of the peripheral wall, the plug is more completely sealed.
[0012]
In addition, the liquid paper container to which the stopper for the liquid paper container according to the present embodiment is attached has a cap tightening torque of 3 kg, the contents are filled at a high temperature at 90 ° C., and the container is cooled to the normal temperature in the cooling process. Intrusion of cooling water from the skirt of the cap into the plug was not observed at all.
[0013]
【The invention's effect】
The liquid paper container cap of the present invention is provided with a position guide rib on the outer peripheral edge of the upper surface of the pedestal ring of the spout, and is provided with a special shape contact sealing ring on the inner peripheral edge of the lower end of the peripheral wall of the cap. Due to this effect, the cooling water does not enter the cap from the bottom of the cap in the shower cooling step after filling the contents at a high temperature.
[0014]
In addition, the liquid paper container cap of the present invention has a constant tightening torque force in the capping step, and also has a constant cap opening torque force during use. Further, since the sealing is performed with a plurality of sealing rings, the sealing is complete.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a liquid paper container cap according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
FIG. 3 is a perspective view of an example of a liquid paper container with a stopper.
FIG. 4 is a cross-sectional view of a conventional liquid paper container cap.
[Explanation of symbols]
10: Plug 20 ... Container 21 ... Plug mounting hole 22 ... Inclined plate 23 ... Body 100 ... Cap 110 ... Top plate 111, 122 ... Contact seal ring 112 ... Inner seal Ring 120 ... Peripheral walls 121, 221 ... Threaded part 200 ... Spout 210 ... Pedestal ring 211 ... Temporary fixing protrusion 212 ... Position guide rib 220 ... Pouring tube 230 ... Closing plate 231 ... Annular cut 232 …… Annular thin fragile wire 233 …… Post 234 …… Pull ring 240 …… Flange

Claims (2)

A spout and a cap screwed to the spout, the spout is provided with a position guide rib on the outer peripheral edge of the upper surface of the pedestal ring, and a pouring tube is erected on the inner peripheral edge of the upper surface. A step is provided at the inner peripheral edge of the lower end, and a contact sealing ring having a vertical cross-sectional shape with an inverted right triangle, a vertical surface inside, and an acute tip angle is suspended from the inner peripheral edge of the step, and the spout is The upper inner peripheral surface of the position guide rib provided on the outer peripheral edge of the upper surface of the pedestal ring of the spout is a contact sealing ring that hangs on the inner peripheral edge of the lower end of the peripheral wall of the cap when the cap is screwed on And the tip of the contact sealing ring of the cap is in close contact with the outer peripheral edge of the upper surface of the pedestal ring of the spout. Plug. 2. The cap for a liquid paper container according to claim 1, wherein a height of a contact sealing ring that is suspended from an inner peripheral edge of a lower end portion of the peripheral wall of the cap is 0.2 mm or more.

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