JP2011116393A - Mouth stopper and packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mouth stopper which when opened by pulling a pull-ring, stress is easily concentrated on a cut spot to allow the mouth stopper to be opened by a small tensile force. <P>SOLUTION: The mouth stopper 100 includes a cap 102 and a spout 101 welded to a packaging container. The spout 101 has a cylindrical side wall 107 on which a cap 102 is screwed down, a partition 106 which closes the spout 101 and has a thin-walled portion 105, an opening pull-ring 103 connected to the vicinity of the inner edge of the thin-walled portion 105 of the partition 106, and a flange 104 which is connected to a side wall 107 and is welded to the inner surface of the edge of a mounting hole of the packaging container. The area of partition 106 that is inside the thin-walled portion 105 is made thinner than the area of partition 106 that is outside the thin-walled portion 105. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a spout stopper to be mounted at a pouring position of a packaging container containing liquid, powder or granules as contents.

  A packaging container provided with a spout stopper is widely used as a packaging container for fluid contents such as liquid, powder or granules.

  FIG. 8 shows an example of a packaging container 1000 provided with such a spout stopper 800. The spout stopper 800 includes a spout 801 fixed to the packaging container 1000 and a cap 802 that can be attached to and detached from the spout 801.

  In FIG. 9, sectional drawing of the spout stopper 800 is typically shown. The spout 801 includes a cylindrical side wall 807, a flange 804, a partition wall 806 and a pull ring 803. In the spout 801, for example, the side wall 807 protrudes from the inside of the packaging container to the outside of the mounting hole provided in the packaging container 1000, and the flange 804 provided on the outer edge of the spout 801 and the inner wall of the packaging container 1000 are ultrasonicated. It is fixed by welding by a sealing method or the like. Further, the partition wall 806 is formed inside the side wall 807 and closes the spout 801 in order to ensure the hermeticity of the packaging container 1000. The partition wall 806 is provided with an annular thin portion 805, and a pull ring 803 is connected in the vicinity of the inner edge thereof.

  When the user pulls the pull ring 803 with a finger, the partition wall 806 is torn along the thin wall portion 805 and opened. Although the partition 806 cannot be restored after opening, the spout 801 can be resealed by screwing the cap 802 to the side wall 807.

  In the spout 801, the thickness of the partition wall 806 is equal between the inner portion and the outer portion of the thin portion 805. As shown in FIG. 10, in the spout 901 disclosed in Patent Document 1, the partition wall 906 is thicker in the inner part of the thin part 905 than in the outer part.

Japanese Patent Laid-Open No. 2004-67101

  In the spout 801, the inner portion and the outer portion of the thin portion 805 of the partition wall 806 have the same thickness. Thereby, the rigidity of an inner part and an outer part was equal. Moreover, in the spout 901, since the inner part of the thin part 905 of the partition 906 is thicker than the outer part, the inner part was higher in rigidity than the outer part. Therefore, when the user opens these spouts, when pulling the pull ring to cut the inner part of the partition wall along the thin wall part, the stress strain generated in the inner part is small, and the stress is less likely to concentrate on the cut part. Therefore, there was a problem that it was necessary to apply a large pulling force.

  Therefore, an object of the present invention is to provide a spout stopper that can easily be opened with a small pulling force because stress on the cut portion is easily concentrated when the pull ring is opened.

  1st invention is a spout stopper which consists of a cap and a spout welded to a packaging container, and a spout is a cylindrical side wall which screws a cap, a partition which closes a spout and has a thin part, An opening pull ring connected to the vicinity of the inner edge of the thin wall portion of the partition wall, and a flange connected to the side wall and welded to the inner surface of the edge portion of the mounting hole of the packaging container. The thickness is a spout stopper that is thinner than the outer thickness of the thin wall portion of the partition wall.

  2nd invention is a packaging container provided with the spout stopper of 1st invention.

  ADVANTAGE OF THE INVENTION According to this invention, when opening by a pull ring, the stress to a cutting location tends to concentrate, and the spout stopper which can be opened with a small pulling force is realizable.

Sectional drawing of the spout stopper which concerns on embodiment of this invention The expanded sectional view of the spout stopper concerning an embodiment of the present invention The figure which shows the mode of opening of the spout which concerns on embodiment of this invention The figure which shows the mode of opening of the spout which concerns on embodiment of this invention The figure which shows the mode of opening of the spout which concerns on embodiment of this invention The figure which shows the example of the malfunction at the time of the spout opening The figure which shows the pull ring which concerns on embodiment and comparative example of this invention Figure showing a packaging container with a spout Cross section of conventional spout stopper Cross section of conventional spout stopper

  FIG. 1 is a cross-sectional view of a spout plug 100 according to an embodiment of the present invention. The spout stopper 100 includes a cap 102 and a spout 101. A partition wall 106 is provided inside the cylindrical side wall 107 of the spout 101 and closes the spout 101. The partition wall 106 is provided with an annular thin portion 105 for easy opening. Further, an opening pull ring 103 connected to the upper surface of the partition wall 106 is formed. The spout 101 includes a flange 104 on the opposite side of the pull ring 103 across the partition wall 106. The spout 101 is fixed to the packaging container by welding the flange 104 to the inner surface of the peripheral edge of the mounting hole of the packaging container.

  The cap 102 and the spout 101 are formed by an injection molding method using a thermoplastic resin such as polypropylene or polyethylene. In addition, the packaging container is formed of a material obtained by laminating aluminum foil, polyethylene, polyethylene terephthalate film, or the like on paper or other flexible packaging materials as in the conventional case.

  FIG. 2 is an enlarged view of a portion indicated by a one-dot chain line in FIG. As shown in FIG. 2, the pull ring 103 is connected to the vicinity of the inner edge of the annular thin portion 105 of the partition wall 106. Further, the thickness d1 of the inner portion 111 from the thin portion 105 of the partition wall 106 is smaller than the thickness d2 of the outer portion 112. A tapered reinforcing portion whose diameter decreases toward the partition wall 106 is provided at a connection portion between the upper surface of the outer portion 112 of the partition wall 106 shown in FIG. This is to provide strength against the force applied to the partition wall 106 at the time of opening, but it is not necessarily provided, and the outer portion 112 of the partition wall 106 may have a uniform thickness.

  As described above, with reference to the cross-sectional view and the top view of the spout 101 shown in FIGS. 3, 4, and 5, the state at the time of opening when the thickness of the inner portion 111 is made thinner than the thickness of the outer portion 112. This will be described below. At the time of opening, the user puts a finger on the pull ring 103 and pulls it, but the illustration of the finger is omitted in these drawings. Further, the cross section of the inner portion 111 of the partition wall 106 is shown in black for easy visual recognition.

  When the pull ring 103 is pulled, the pulling force is transmitted from the pull ring 103 to the partition wall 106. Since the inner part 111 of the partition wall 106 is thinner than the outer part 112, the rigidity of the inner part 111 is lower than the rigidity of the outer part 112. Therefore, the inner portion 111 is distorted in the direction in which the vicinity of the connection portion with the pull ring 103 is lifted, but the outer portion 112 is not distorted as much as the inner portion 111 (FIG. 3). Due to this difference in strain, shear stress concentrates in the vicinity of the connection portion with the pull ring 103 (the portion surrounded by the broken line in FIG. 3) in the thin wall portion 105 of the partition wall 106. Thus, this portion can be cut with a small pulling force.

  When the pulling is continued, cutting proceeds along the thin wall portion 105 (FIG. 4). Since the rigidity of the inner part 111 is low, the distortion of the inner part 111 moves with the movement of the cutting part (the part surrounded by the broken line in FIG. 4), and always occurs in the vicinity of the cutting part. Therefore, the shear stress continues to be concentrated at the cutting site while the cutting is in progress. Therefore, cutting can be continued with a small tensile force.

  The inner portion 111 is cut along the thin portion 105 until the cutting is completed (FIG. 5). Since the rigidity of the inner portion 111 is relaxed, cutting progresses along the thin wall portion 105 in order, and at the final stage of cutting, in the narrow area of the thin wall portion 105 of the partition wall 106 (a portion surrounded by a broken line in FIG. 5). The inner portion 111 and the outer portion 112 are connected. From this state, if the pull ring 103 is further pulled in order to completely separate the inner part 111, this part is simultaneously cut and the cutting is completed. At the final stage of the cutting, the pulling force is concentrated in a relatively narrow range, so that the pull ring 103 can be completely separated with a small pulling force.

  On the other hand, the case where the thickness of the inner part 111 is not adjusted like this invention is demonstrated. FIG. 6 shows a state where the cutting of the inner portion 111 has progressed to some extent. When the rigidity of the inner part 111 is large, the distortion of the inner part 111 is limited, and therefore the cutting of the partition wall 106 along the thin part 105 does not proceed as smoothly as the example of this embodiment (FIG. 4). As a result, at the final stage of cutting, the inner portion 111 and the outer portion 112 are connected in a wide range including the cut portion of the inner portion 111. When the pull ring 103 is further pulled from this state, the pulling force is dispersed over a wide range including the inside of the thin portion 105 (a portion surrounded by a broken line in FIG. 6). Therefore, the thin portion 105 that has not been cut yet is torn simultaneously to complete cutting, and a large tensile force is required. On the other hand, in this embodiment, since the concentration of the shear stress at the cutting location continues until the completion of cutting, such a large tensile force is not required and the unsuccessful opening can be prevented.

  As described above, the spout 101 according to this embodiment can be opened with a small pulling force because the pulling force is always concentrated on the cut portion of the partition wall 106 when the pull ring 103 is opened.

  In the spout 101 of this embodiment, the thickness d3 of the side wall 107 may be made thicker than the thickness d1 of the inner portion 111 of the partition wall 106 to increase the rigidity of the side wall 107. Thereby, when the inner wall 111 of the partition wall 106 is pressed against the side wall when the pull ring 103 is pulled to cut the partition wall 106, the side wall 107 can be prevented from being deformed. Therefore, the bending or distortion of the inner portion 111 of the partition wall 106 is not relaxed as the side wall 107 is deformed, and the concentration of the tensile force at the cutting location is maintained, and the partition wall 106 is completely cut with a small tensile force. And can be separated.

  In this embodiment, the spout 101 employs a structure that is screwed with the cap 102, but is not particularly limited as long as the spout 101 can be opened and closed. For example, a structure in which the outer surface of the spout 101 is covered with the inner surface of the cap 102 or a structure in which the cap 102 and the spout 101 are fitted may be employed. The packaging container 1000 uses paper or other soft packaging material, but is not particularly limited as long as it can enclose the contents of liquid, powder or granules, and is poured into a resin pouch or gusset bag. An outlet plug 100 may be attached.

  For verification, Examples 1-4, which are spouts according to the present embodiment, and Comparative Example 1-4 are prepared, and a mechanical tensile test is performed with a tensile speed of 300 mm / min and a V-shaped tensile jig (diameter 12 mm). The tensile strength at the beginning of opening and at the end of opening was measured. Hereinafter, Example 1-4 and Comparative Example 1-4 will be described with reference to FIG.

Example 1
The spout of Example 1 is the spout 101 shown in FIG. 1 and FIG. The shape of the pull ring 103 of the spout 101 is schematically shown in FIG. The pull ring 103 has a shape in which a ring portion is connected to an I-shaped column portion. FIG. 7A shows the partition 106 and the pull ring 103 of the spout 101, and the other parts are not shown. About the side wall 107, the position and height are shown with the dashed-dotted line. Moreover, the thickness of the part inside the thin part 105 of the partition 106 is 0.8 mm, and the thickness of the outer part is 1.0 mm. The spout is made of medium-rigid LDPE (low density polyethylene).

(Example 2)
The spout of Example 2 differs from Example 1 only in the shape of the pull ring. FIG. 7B schematically shows a pull ring 703 provided in the spout. The pull ring 703 has a shape in which the upper portion of the support portion is branched into a V shape and the ring portions are connected to both ends thereof. 7B also shows the partition wall 106 and the pull ring 703 as in FIG. 7A, and the other parts are not shown. About the side wall 107, the position and height are shown with the dashed-dotted line. Further, as in Example 1, the thickness of the portion inside the thin wall portion 105 of the partition wall 106 is 0.8 mm, and the thickness of the outer portion is 1.0 mm. The spout is made of medium-rigid LDPE.

(Example 3)
The spout of the third embodiment includes a pull ring 103 having the same shape as that of the first embodiment, and the thickness of the partition wall is the same as that of the first embodiment, but is formed of a highly rigid LDPE.

Example 4
The spout of the fourth embodiment includes a pull ring 703 having the same shape as that of the second embodiment, and the thickness of the partition wall is the same as that of the first embodiment, but is formed of a highly rigid LDPE.

(Comparative Example 1)
The spout of Comparative Example 1 includes the pull ring 103 having the same shape as that of Example 1, but the partition wall thickness is 1.0 mm both inside and outside the thin portion. In addition, the spout is formed of a medium-rigid LDPE as in the first embodiment.

(Comparative Example 2)
The spout of Comparative Example 2 includes a pull ring 703 having the same shape as that of Example 2, but the partition wall thickness is 1.0 mm both inside and outside the thin portion. In addition, the spout is formed of medium-rigid LDPE, as in the second embodiment.

(Comparative Example 3)
The spout of Comparative Example 3 includes the pull ring 103 having the same shape as that of Example 3, but the partition wall thickness is 1.0 mm both inside and outside the thin portion. In addition, the spout is formed of high-rigidity LDPE as in the third embodiment.

(Comparative Example 4)
The spout of Comparative Example 4 includes a pull ring 703 having the same shape as that of Example 4, but the partition wall thickness is 1.0 mm both inside and outside the thin portion. In addition, the spout is formed of high-rigidity LDPE as in the fourth embodiment.

  In these examples and comparative examples, those having a flexural modulus of 180 MPa or more and less than 230 MPa were used as medium-rigid LDPE, and those having a flexural modulus of 150 MPa or more and less than 180 MPa were used as high-rigidity LDPE.

  The results shown in Table 1 were obtained for Examples 1 and 2 and Comparative Examples 1 and 2. The results shown in Table 2 were obtained for Examples 3 and 4 and Comparative Examples 3 and 4. According to Table 1, Examples 1 and 2 formed of medium-rigid LDPE have a lower tensile force at the beginning of opening and at the end of opening than Comparative Examples 1 and 2 having the same medium-rigidity. It was confirmed that Similarly, according to Table 2, it was confirmed that Examples 3 and 4 formed of LDPE with high rigidity had a lower tensile force than Comparative Examples 3 and 4 with the same high rigidity. By these, the effect of the present invention was confirmed.

  INDUSTRIAL APPLICABILITY The present invention is useful for labor saving or the like when pulling a pull ring and opening it in a spout stopper attached to a packaging container containing liquid, powder or granules as contents.

100, 800, 900 Outlet plug 101, 801, 901 Spout 102, 802, 902 Cap 103, 703, 803, 903 Pull ring 104, 804, 904 Flange 105, 805, 905 Thin wall portion 106, 806, 906 Partition wall 107, 807 , 907 Side wall 111 Inner part 112 Outer part 1000 Packaging container

Claims (2)

A spout stopper composed of a cap and a spout welded to the packaging container,
The spout is
A cylindrical side wall for screwing the cap;
A partition wall that closes the spout and has an annular thin wall;
An opening pull ring connected to the vicinity of the inner edge of the thin wall portion of the partition;
A flange connected to the side wall and welded to the inner surface of the edge of the mounting hole of the packaging container;
The thickness of the area | region inside the thin part of the said partition is a spout stopper which is thinner than the thickness of the outer side of the thin part of the said partition. A packaging container,
A container body;
The packaging container provided with the spout stopper of Claim 1 welded to the said container main body.

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