JP4428113B2 - Mouth plug with pull ring for opening liquid containers - Google Patents

Description

  The present invention relates to a dispensing part of a liquid container such as a plastic bottle container, a hinge cap container, a pouch container, or a paper pack container filled and packed with contents such as beverages such as juices and alcoholic beverages or seasonings. In particular, the present invention relates to a plug with a pull ring for opening a liquid container provided with a pull ring for opening.

  In general, as a spout stopper for a liquid container made of plastic or paper, for example, a side cross-sectional view of FIG. As shown in the plan view of FIG. 4B, a cylindrical opening for pouring of a plastic spout stopper A (spout) attached to the upper part of a rectangular tubular liquid paper container 10 (liquid packaging paper pack). 1 (cylindrical portion) is closed with a closing plate 2, half-cutting for easy opening is performed on the closed closing plate 2 surface, and a ring-shaped (for example, circular ring-shaped) half-cutting line 3 is applied, In the region of the ring-shaped half cutting line 3, there is a pull-open type spout stopper A to which a support column 4 and a pull ring 5 are attached. In addition, the spout stopper A attached to the outer periphery of the lower end of the cylindrical portion 1 of the spout stopper A in alignment with the spout stopper mounting hole 11 provided in the container 10 is attached to the inner surface of the container 10 or A flange plate 6 for fusing and attaching to the outer surface by ultrasonic heat sealing or the like is provided.

  As conventional techniques of the above-described pull-open type spout stopper A for plastic or paper liquid containers, there are, for example, JP-A-6-24459 and JP-A-5-72755.

  The pull-opening column 4 of the conventional pull-opening type spout A has a ring-shaped half cutting line 3 region of the closing plate 2 of the plug A as shown in FIGS. In addition, the half-cutting line 3 is provided so as to stand close to a part of the line, and a pull ring 5 for hooking and pulling a finger is integrally provided at the upper end of the column 4.

  When opening the above-mentioned pull-open type spout stopper A, a finger is inserted into the ring of the pull ring 5 shown in FIG. 4A, and as shown in FIGS. By closing the pull ring 5 and the support column 4 in the direction of the solid arrow I along the formation direction of the half cutting line 3, the plug A connected to the support column 4 from the ring-shaped half cutting line 3 near the support column 4 is closed. The plate 3 starts to be cut, and then the entire line 3 is cut along the half-cutting line 3 as shown by the dotted arrow Ia, and the closing plate 2 of the plug A is cut off from the half-cutting line 3 and the container 1 Is opened.

  In this way, the pull-opening support column 4 is provided in the vicinity of a part of the half-cutting line 3 so that it can be pulled up in the direction along the forming direction of the half-cutting line 3, and is therefore closed. The plate 2 can be easily opened along the half-cutting line even with a relatively weak force.

  However, when the column 4 is pulled up in a direction different from the direction along the formation direction of the half-cutting line 3 which is the direction of the solid arrow I shown in FIGS. May not cut smoothly in the direction of the dotted arrow Ia along the half-cutting line 3, and the pull ring 5 or the support column 4 may be cut off in the middle or may not be opened.

In general, a spout attached to a liquid paper container such as a paper pack has a small diameter, so the ring diameter of the pull ring 5 is also small. In the case of a thin finger, a finger is placed in the ring of the pull ring 5. However, in the case of a thick finger, it is difficult to put a finger into the ring of the pull ring 5, and therefore it is difficult to pull up the pull ring 5 and it is difficult to open it. For example, a thin rod or instrument that can be inserted into the pull ring 5 such as a ballpoint pen or chopsticks is inserted and pulled up.

  Thus, when pulling up the pull ring 5 and the column 4 using an instrument or the like, the column 4 is not necessarily pulled up in the direction along the formation direction of the half-cutting line 3, but pulled up in the other direction. There was a problem that it was difficult to open.

The known patent documents are described below.
JP-A-6-24459 Utility Kaihei 5-72755

  The subject of this invention is providing the plug with a pull ring for opening devised in order to solve said problem.

  As shown in FIGS. 1A to 1B, the invention according to claim 1 of the present invention includes a cylindrical body portion 1, a closing plate 2 that closes the inside of the cylindrical body portion 1, and a cylinder on the closing plate 2. A ring-shaped closed-curved half-cutting line 3 cut along the inner periphery of the body 1, and an inner region of the closed-curved half-cutting line 3 on the closing plate 2 in the vicinity of a part of the half-cutting line 3 In a stopper for a liquid container provided with an opening pull ring comprising a support column 4 erected integrally and a pull ring 5 provided horizontally at the upper end of the support column 4, an inner region of the closed curved half-cutting line 3 is provided. The arc-shaped open curved half-cutting line 7 centering on the support column 4 has one end connected to the closed-curved half-cutting line 3 at the connecting portion 8 and the other end separated from the closed-curved half-cutting line 3. Part 9 It is with pull ring spout for a liquid container opening, characterized in that provided in separated Te.

  As shown in FIG. 1A and FIG. 2, the invention according to claim 2 of the present invention is a cylindrical body 1, a closing plate 2 that closes the inside of the cylindrical body 1, and a cylindrical body on the closing plate 2. A ring-shaped closed-curved half-cutting line 3 cut along the inner periphery of the part 1 and an inner region of the closed-curved half-cutting line 3 in the vicinity of a part of the half-cutting line 3 and integrated on the closing plate 2 In the stopper for a liquid container provided with a pull ring for opening comprising a support column 4 standing upright and a pull ring 5 provided horizontally at the upper end of the support column 4, an inner region of the closed curved half-cutting line 3 An S-shaped open curved half-cutting line 7 with a gentle curve is connected at one end to the closed curved half-cutting line 3 at the connecting portion 8, and the other end is separated to the closed curved half-cutting line 3. The support 9 is provided in the S-shape on the side of the separating portion 9 of the open curved half-cutting line 7 which is provided apart from the portion 9 and is separated from the closed curved half-cutting line 3. It is a plug with a pull ring for opening a liquid container.

The invention according to claim 3 of the present invention is the connection in which one end of the open curved half-cutting line 7 is connected to the closed curved half-cutting line 3 in the stopper with a pull ring for opening a liquid container according to the first or second aspect. In the section 8, an open curved half cutting line 7
The mouthpiece with a pull ring for opening a liquid container is characterized in that the half-cut thickness of the liquid container is thicker than the half-cut thickness of the closed curved half-cutting line.

  The invention according to claim 4 of the present invention is the plug with a pull ring for opening a liquid container according to any one of claims 1 to 3, wherein the separating portion 9 side of the open curved half cutting line 7 is a closed curved half A mouthpiece with a pull ring for opening a liquid container, characterized in that it is separated from the cutting line 3 by 1.5 mm or more.

  The stopper with a pull ring for opening a liquid container according to claim 1 of the present invention has a cylindrical body portion 1 on a closing plate 2 that closes the inside of the cylindrical body portion 1 as shown in FIGS. Since the ring-shaped closed curved half-cutting line 3 is formed along the inner periphery, the pull ring 5 and the column 4 are pulled up in the direction of the solid arrow (I) along the formation direction of the ring-shaped closed curved half-cutting line 3. As a result, the closure plate 2 of the plug A connected to the column 4 starts to be cut from the half-cutting line 3 in the vicinity of the column 4, and then, as shown in FIG. 1B, the direction indicated by the dotted arrow (Ia) Then, the entire line 3 is cut along the half cutting line 3, and the closing plate 2 of the plug A can be cut off from the half cutting line 3 to open the container 1.

  Moreover, the stopper with a pull ring for opening a liquid container according to claim 1 of the present invention has an inner region of the ring-shaped closed curved half-cutting line 3 as shown in FIGS. An arc-shaped open curved half-cutting line 7 having a column 4 to which a pull ring 5 is attached as a substantially center O is connected at one end to a closed-curved half-cutting line 3 at a connecting portion 8 and the other end is a closed-curved half-cutting line. Since the cutting line 3 is separated from the separation portion 9, as shown in FIGS. 1A to 1B, a solid line arrow (different from the formation direction of the ring-shaped closed curved half-cutting line 3 ( II) By pulling up the pull ring 5 and the support column 4 in the direction, as shown in FIG. 1B, the arc-shaped open curved half cutting line 7 near the support column 4 is cut. Then, as shown in FIG. 1 (b), the entire line 7 other than the separating portion 9 is cut along the open curved half-cutting line 7 in the direction indicated by the dotted arrow (IIa), The closed-curved half-cutting line 3 connected to the open-curved half-cutting line 7 at the connecting portion 8 starts to cut from the connecting portion 8 in the direction shown by the dotted arrow (IIb), and then the closed-curved half-cutting line 3 The entire cutting line 3 is cut, and the closing plate 2 of the plug A can be cut off from the half cutting line 3 to open the container 1.

  A stopper with a pull ring for opening a liquid container according to a second aspect of the present invention includes a closure plate 2 that closes the inside of the cylindrical portion 1, as shown in FIGS. Since the ring-shaped closed curved half-cutting line 3 is formed along the circumference, the pull ring 5 and the column 4 are pulled up in the direction of the solid arrow (I) along the formation direction of the ring-shaped closed curved half-cutting line 3. As shown in FIG. 2, the closing plate 2 of the plug A connected to the lower end (base) of the support column 4 starts to be cut from the closed curved half-cutting line 3 in the vicinity of the support column 4, and subsequently shown in FIG. Thus, the entire line 3 is cut along the half-cutting line 3 in the direction shown by the dotted arrow (Ia), and the closing plate 2 of the plug A is cut off from the closed-curved half-cutting line 3 to be placed in the container 1. It can be opened.

In addition, as shown in FIG. 2, the stopper with a pull ring for opening a liquid container according to claim 2 of the present invention has an S-shape with a gentle curve in the inner region of the ring-shaped closed curved half-cutting line 3. The open-curved half cutting line 7 is provided with one end thereof connected to the closed-curved half-cutting line 3 at the connecting portion 8 and the other end thereof separated from the closed-curved half-cutting line 3 at the separating portion 9. As shown in FIGS. 1A and 2, the support column 4 is provided in an S shape on the side of the separating portion 9 of the open curved half-cutting line 7 that is separated from the closed curved half-cutting line 3. In addition, by pulling up the pull ring 5 and the support column 4 in the direction of the solid line arrow (II) different from the formation direction of the ring-shaped closed curved half-cutting line 3 As shown in FIG. 2, the S-shaped open curved half-cutting line 7 in the vicinity facing the support column 4 starts to be cut, and then, in the direction shown by the dotted arrow (IIa) as shown in FIG. The entire S-shaped line 7 other than the separating part 9 is cut along the half-cutting line 7, and then the closed-curved half-cutting line 3 connected to the open-curved half-cutting line 7 at the connecting part 8 However, it begins to cut in the direction shown by the dotted line arrow (IIb) from the connecting portion 8, and then the entire closed curved half cutting line 3 is cut, so that the closing plate 2 of the plug A is closed curved half cutting. The container 1 can be opened by being disconnected from the line 3.

  As described above, the stopper with a pull ring for opening a liquid container according to the present invention is capable of closing the closing plate 2 in a closed-curved half shape regardless of whether the pull ring 5 is pulled in the direction indicated by the solid arrow (I) or the direction (II). It can be smoothly cut, cut and opened along the cutting line 3, and can be opened easily without specifying the pulling direction of the pull ring 5 of the plug with a pull ring. When pulling up the pull ring 5 and the support column 4 using, for example, it is not always necessary to pull up the support column 4 in the direction of the solid arrow (I) along the forming direction of the half-cutting line 3, There is an effect that can be opened smoothly.

  The embodiment of the mouthpiece with pull ring for opening a liquid container according to the present invention will be described in detail below based on the side sectional view of FIG. 1 (a) to the plan view of FIG. 1 (b) and the plan view of FIG. To do.

  The stopper A with a pull ring for opening a liquid container according to claim 1 of the present invention has a cylindrical body portion 1 and a lower end portion in a cylinder of the cylindrical body portion 1 as shown in FIGS. A closing plate 2 to be closed, a ring-shaped closed curved half cutting line 3 cut along the inner periphery of the cylindrical portion 1 on the lower surface of the closing plate 2, and an inner region of the closed curved half cutting line 3, An opening pull ring is provided, which is composed of a support column 4 standing integrally on the closing plate 2 near a part of the half-cutting line 3 and a pull ring 5 provided in the horizontal direction at the upper end of the support column 4.

  As shown in FIG. 1B, the lower surface of the closing plate 2 in the inner region of the closed curved half-cutting line 3 has a radius of the closed curved half-cutting line 3 with the center position O of the support column 4 as the center. An arc-shaped open curved half-cutting line 7 having a small radius is cut.

  One end of the open-curved half-cutting line 7 is connected to the closed-curve-shaped half-cutting line 3 at the connection portion 8, and the other end is provided away from the closed-curve-shaped half-cutting line 3 at the separation portion 9. ing.

  A stopper A with a pull ring for opening a liquid container according to claim 2 of the present invention closes the cylindrical portion 1 and the lower end portion of the cylindrical portion 1 in the cylinder, as shown in FIGS. The closing plate 2, the ring-shaped closed curved half-cutting line 3 cut along the inner periphery of the cylindrical portion 1 on the lower surface of the closing plate 2, and the half-cutting line 3 on the inner side of the closed-curved half-cutting line 3 An opening pull ring is provided which includes a support column 4 standing integrally on the closing plate 2 near a part of the cutting line 3 and a pull ring 5 provided in the horizontal direction at the upper end of the support column 4.

Then, as shown in FIG. 2, an S-shaped open curved half-cutting line 7 with a gentle curve is cut on the lower surface of the closing plate 2 in the inner region of the ring-shaped closed curved half-cutting line 3. Yes.

  One end of the S-shaped open curved half-cutting line 7 is connected to the closed curved half-cutting line 3 at the connecting portion 8, and the other end is connected to the closed curved half-cutting line 3 and the separating portion 9. Are set apart from each other.

  As shown in FIG. 2, the support column 4 is provided in an S shape on the side of the separating portion 9 of the open curved half-cutting line 7 that is separated from the closed curved half-cutting line 3.

  As shown in FIG. 2, of the S-shaped open curved half-cutting line 7, the end of the line 7 having an arc shape on the side of the connecting portion 8 connected to the closed curved half-cutting line 3 is connected thereto. It is connected from the portion 8 toward the acute angle (angle of 45 ° or less) with respect to the closed curved half-cutting line 3, that is, away from the support column 4, while the S-shaped open curved half-cutting is performed. Of the line 7, the end of the line 7 having an arc shape on the side of the separating part 9 that is separated from the closed curved half cutting line 3 is obtuse with respect to the closed curved half cutting line 3 toward the separating part 9 (45 (° to 90 °), i.e., away from the column 4.

  Of the S-shaped open curved half-cutting line 7, the end of the arc-shaped line 7 on the connection portion 8 side has a radius smaller than or equal to the radius of the closed curved half-cutting line 3, for example. On the other hand, the end portion of the line 7 that forms the arc shape on the side of the separating portion 9 is, for example, a closed curved half cutting line with the center position O of the support column 4 as the center. It is cut as an arc-shaped line 7 having a radius smaller than or equal to the radius of 3.

  The stopper with a pull ring for opening a liquid container according to claim 1 of the present invention has a cylindrical body portion 1 on a closing plate 2 that closes the inside of the cylindrical body portion 1 as shown in FIGS. A ring-shaped closed curved half-cutting line 3 is formed along the inner periphery, and the pull ring 5 and the column 4 are pulled up in the direction of the solid arrow (I) along the direction of formation of the ring-shaped closed curved half-cutting line 3. As a result, the closure plate 2 of the plug A connected to the column 4 starts to be cut from the half-cutting line 3 near the column 4.

  Subsequently, as shown in FIG. 1B, the entire line 3 is cut along the half-cutting line 3 in the direction indicated by the dotted arrow (Ia), and the closing plate 2 of the plug A becomes the half-cutting line. The container 1 is cut off from 3 and opened.

  Moreover, the stopper with a pull ring for opening a liquid container according to claim 1 of the present invention has an inner region of the ring-shaped closed curved half-cutting line 3 as shown in FIGS. An arc-shaped open curved half-cutting line 7 having a column 4 attached with a pull ring 5 as a substantially center O, one end of which is connected to the closed-curved half-cutting line 3 by a connecting portion 8, and the other end is closed-curved. A solid line arrow (which is different from the formation direction of the ring-shaped closed-curved half-cutting line 3 as shown in FIGS. II) By pulling up the pull ring 5 and the support column 4 in the direction, an arcuate open curved half cutting line 7 in the vicinity facing the support column 4 starts to be cut as shown in FIG. That.

  Subsequently, as shown in FIG. 1B, the entire line 7 other than the separation portion 9 is cut along the open curved half-cutting line 7 in the direction indicated by the dotted arrow (IIa).

  Subsequently, the closed curved half-cutting line 3 connected to the open curved half-cutting line 7 at the connecting portion 8 starts to cut from the connecting portion 8 in the direction indicated by the dotted arrow (IIb), and then the closed curved line. The entire half-cutting line 3 is cut, and the closure plate 2 of the plug A is cut off from the half-cutting line 3 and the container 1 is opened.

  A stopper with a pull ring for opening a liquid container according to a second aspect of the present invention includes a closure plate 2 that closes the inside of the cylindrical portion 1, as shown in FIGS. A ring-shaped closed curved half-cutting line 3 is formed along the circumference, and by pulling up the pull ring 5 and the support column 4 in the direction of the solid arrow (I) along the forming direction of the ring-shaped closed curved half-cutting line 3 As shown in FIG. 2, the closure plate 2 of the spigot A connected to the lower end portion (base portion) of the support column 4 starts to be cut from the closed curved half cutting line 3 in the vicinity of the support column 4.

  Subsequently, as shown in FIG. 2, the entire line 3 is cut along the half-cutting line 3 in the direction indicated by the dotted arrow (Ia), and the closing plate 2 of the plug A becomes a closed curved half-cutting line. 3 can be opened and the container 1 can be opened.

  In addition, as shown in FIG. 2, the stopper with a pull ring for opening a liquid container according to claim 2 of the present invention has an S-shape with a gentle curve in the inner region of the ring-shaped closed curved half-cutting line 3. The open-curved half cutting line 7 is provided with one end thereof connected to the closed-curved half-cutting line 3 at the connecting portion 8 and the other end thereof separated from the closed-curved half-cutting line 3 at the separating portion 9. The support column 4 is provided in an S-shape on the side of the separating portion 9 of the open curved half-cutting line 7 that is separated from the closed curved half-cutting line 3, as shown in FIG. 1 (a) and FIG. By pulling up the pull ring 5 and the column 4 in the direction of the solid line arrow (II) different from the formation direction of the ring-shaped closed curved half-cutting line 3, Strut 4 and the counter open curved half cut line 7 of the S-shaped in the vicinity of the start off as shown in FIG.

  Subsequently, the entire S-shaped line 7 other than the separating portion 9 is cut along the open curved half-cutting line 7 in the direction indicated by the dotted arrow (IIa) as shown in FIG. The closed curved half-cutting line 3 connected to the open curved half-cutting line 7 at the connecting portion 8 starts to be cut from the connecting portion 8 in the direction indicated by the dotted arrow (IIb).

  Subsequently, the entire closed curved half-cutting line 3 is cut, and the closure plate 2 of the stopper A can be separated from the closed curved half-cutting line 3 to open the container 1.

  Thus, the stopper with a pull ring for opening a liquid container according to the present invention allows the closing plate 2 to be closed in a half-closed shape even if the pull ring 5 is pulled in either the direction of the solid arrow (I) or the direction of (II). It can be cut smoothly along the cutting line 3, separated and opened, and can be opened easily without specifying the pulling direction of the pull ring 5 of the plug with a pull ring. When pulling up the pull ring 5 and the support column 4 with the use of, it is not always necessary to pull up the support column 4 in the direction of the solid arrow (I) along the forming direction of the half-cutting line 3. Can be opened.

  The relationship between the half-cut thickness t of each of the closed-curved half-cutting line 3 and the open-curved half-cutting line 7 in the plug A of the present invention is at least an open-curved shape at the connecting portion 8 connected to the closed-curved half-cutting line 3. The half cut thickness t at one end of the half cutting line 7 is desirably larger than the half cut thickness t of the closed curved half cutting line 3.

  1B and 2, when the pull ring 5 is pulled in the direction of the solid arrow (I) (normal opening direction), the closed curved half cutting line 3 and the open curved half cutting line 7 are drawn. It is possible to prevent the cutting from progressing to the open curved half-cutting line 7 of each half-cutting line, and only when the pull ring 5 is pulled up in the direction of the solid arrow (II) (reverse opening direction). The cutting can proceed to the open curved half-cutting line 7.

  In the plug A of the present invention, the end of the open curved half-cutting line 7 on the side of the separating portion 9 is separated from the closed curved half-cutting line 3 by at least 1.5 mm or more. It is desirable.

  If the pull ring 5 is less than 1.5 mm, when the pull ring 5 is pulled up in the direction of the solid line arrow (I) or (II), depending on the pulling force and pulling speed, only the column 4 and the closing plate 2 in the vicinity thereof are cut off. However, there is a risk that the other closure plate 2 may remain on the side of the plug A main body, and if it is 1.5 mm or more, the risk can be avoided.

  The spigot A of the present invention can cover the upper end opening of the cylinder part 1 with a lid (cap) from above the cylinder part 1, for example, as shown in FIG. A screw part 1 a is screwed on the outer periphery of the body part 1, and a screw cap (not shown) is screwed from above the cylinder part 1 so that the lid can be applied. In addition, the plug A according to the present invention is attached to the outer periphery of the upper end portion of the cylindrical body portion 1 via a hinge so that the cap (not shown) can be opened and closed. You may enable it to cover by the uneven | corrugated fitting to 1 upper-end opening part.

  As shown in FIG. 1 (a), the spigot A of the present invention includes a flange plate 6 projecting outward on the outer periphery of the lower end of the cylindrical portion 1, and a paper container 10 (liquid packaging paper pack) for liquid packaging. The cylindrical body portion 1 is inserted into the opening portion 11 for attaching the stopper from the inner surface side of the container 10, and the flange plate 6 of the stopper A is adhered to the inner surface of the container 10 by heat sealing. 10 is attached as an internal system.

  Further, the plug A of the present invention is aligned with the hole mounting portion 11 for attaching the plug of the paper container 10 (liquid packaging paper pack) for liquid packaging, and the flange of the plug A is attached to the outer surface of the container 10. You may make it attach to the container 10 as an external attachment system (not shown) by sticking the board 6 and sticking with a heat seal.

  Moreover, as shown in the side sectional view of FIG. 3, the spigot A of the present invention includes a fitting portion 1b at the lower end of the cylindrical portion 1, and the fitting portion 1b is a liquid. You may make it attach by inserting in the fitting part 12a for spout stopper attachment of the bottle container 12 for packaging, and carrying out close fitting.

(A) is a sectional side view of the stopper with a pull ring for liquid container opening of this invention, (b) is the top view. Side sectional drawing explaining other embodiment of the stopper with a pull ring for liquid container opening of this invention. Side sectional drawing explaining other embodiment of the stopper with a pull ring for liquid container opening of this invention. (A) is a sectional side view of the conventional stopper with a pull ring for opening a liquid container, and (b) is a plan view thereof.

Explanation of symbols

A ... Mouth plug with pull ring
DESCRIPTION OF SYMBOLS 1 ... Cylindrical body 2 ... Closure board 3 ... Closed curve-shaped half cutting line 4 ... Support | pillar 5 ... Pull ring 6 ... Flange plate 7 ... Open curve-shaped half cutting line 8 ... Connection part 9 ... Separation part 10 ... Paper container 12 ... Bottle

Claims (4)

  A cylindrical body part, a closing plate for closing the inside of the cylindrical body part, a ring-shaped closed curved half cutting line cut along the inner periphery of the cylindrical body part, and an inner region of the closed curved half cutting line In a stopper for a liquid container provided with an opening pull ring comprising a support column that stands integrally on a closing plate in the vicinity of a part of a half-cutting line, and a pull ring that is provided horizontally at the upper end of the support column, An arc-shaped open curved half-cutting line centered on the support column is connected to the inner side of the closed curved half-cutting line, one end of which is connected to the closed curved half-cutting line at the connecting portion, and the other end is closed-curved. A mouthpiece with a pull ring for opening a liquid container, wherein the mouthpiece is provided on a half cutting line at a separation portion.   A cylindrical body part, a closing plate for closing the inside of the cylindrical body part, a ring-shaped closed curved half cutting line cut along the inner periphery of the cylindrical body part, and an inner region of the closed curved half cutting line In a stopper for a liquid container provided with an opening pull ring comprising a support column that stands integrally on a closing plate in the vicinity of a part of a half-cutting line, and a pull ring that is provided horizontally at the upper end of the support column, An S-shaped open curved half-cutting line with a gentle curve is connected to the inner side of the closed curved half-cutting line by connecting one end thereof to the closed curved half-cutting line at the connecting portion and the other end side being closed-curved. The open-curved half-cut is provided on the half-cutting line so that it is separated from the half-cutting line, and the column is separated from the closed-curved half-cutting line. Ingurain the other end of the S-shaped in the liquid container opening for with pull ring spout, characterized in that provided in the.   In the connection portion where one end of the open curved half cutting line is connected to the closed curved half cutting line, the half cut thickness of the open curved half cutting line is larger than the half cut thickness of the closed curved half cutting line. The stopper with a pull ring for opening a liquid container according to claim 1 or 2.   4. The pull ring for opening a liquid container according to claim 1, wherein a separation portion of the open curved half-cutting line is separated from the closed curved half-cutting line by 1.5 mm or more. 5. Mouth plug.

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