JP4663082B2 - Capable plastic container lid - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a container lid made of a synthetic resin, of a stopper type, that is, a type that is fitted to the mouth and neck of the container and is attached to the mouth and neck by pressing downward in the axial direction. The present invention relates to a synthetic resin container lid that can be easily separated from a container and collected separately from the container after the product is consumed.
[0002]
[Prior art]
As a container lid for a container having a cylindrical mouth-and-neck portion with an open top surface and an annular locking protrusion formed on the outer peripheral surface of the mouth-and-neck portion, an appropriate composition such as polyethylene or polypropylene is used. Container lids made of resin are widely used in practice. The container lid has a cylindrical skirt wall. On the inner peripheral surface of the skirt wall, a locking means which may be an annular ridge projecting radially inward is formed. When the container lid is attached to the mouth / neck of the container, the container lid is fitted on the mouth / neck and pressed downward in the axial direction. Engage with the stop ridge.
[0003]
Thus, recently, for so-called separate collection, it is desired to separate the container lid from the neck of the container when the container and the container lid are discarded after the contents of the container are consumed. Yes. In a normal state before separating the container lid from the container neck and neck for separation and collection, the container lid is sufficiently held in the container neck and neck in the normal state before separation and collection. It is important to ensure that accidental detachment of the container lid from the neck is important, and when removing the container lid from the mouth and neck for separate collection, a special bottle opener is required. It is important that the container lid can be removed from the mouth-and-neck part easily without the need for a tool or the like.
[0004]
Utility Model Registration No. 2559266 discloses a synthetic resin container lid for the above request, a circumferential break line extending in the circumferential direction on the cylindrical skirt wall, and a break start line extending from the circumferential break line to the lower end of the skirt wall. A container lid is disclosed in which the locking means is disposed above the circumferential break line. The circumferential break line can be composed of a score with a reduced residual thickness, and the break start line can be composed of a slit. In the normal state in which the container lid is attached to the mouth and neck of the container as required, the skirt wall has a skirt that extends below the circumferential break line. The portion above the circumferential break line, i.e., the portion where the locking means is disposed, is prevented or suppressed from being displaced radially outward, thereby ensuring that the container lid is sufficiently secured to the mouth and neck of the container. Retained. On the other hand, when the container lid is detached from the mouth / neck portion of the container, the circumferential rupture line is ruptured, and the skirt wall is ruptured at least in the circumferential direction immediately below the locking means. Thus, the locking means can be displaced radially outward, and the container lid can be detached from the mouth and neck of the container.
[0005]
[Problems to be solved by the invention]
Thus, the conventional container lid of the above-described form is not easy even if it is not impossible to displace the locking means radially outward even after the circumferential break line is broken. It has been quite difficult to remove the container lid from the mouth and neck of the container without using a special tool.
[0006]
The present invention has been made in view of the above-described facts, and the main technical problem thereof is that the container lid is detached from the container neck in the normal state where the container lid is attached to the container neck. In order to remove the container lid from the container neck and neck for separation and collection, there is no need for a special tool or the like. It is an object of the present invention to provide a new and improved container lid that can be removed from the container sufficiently reliably.
[0007]
[Means for Solving the Problems]
As a result of intensive studies, the inventor has made an axial weakening line on the skirt wall extending in the axial direction upward in the axial direction with a width W from the lower end separated from the circumferential breaking line by the gap S in the circumferential direction. And a plurality of locking means are interrupted by each of the axially weakening lines, and the circumferentially broken line is interrupted at an angular portion where each of the axially weakening lines exists to define a non-breaking portion. and the circumferential length L of the unbroken portion rather small larger the width W than the gap S (S <L <W), and the circumferential break line and the axis direction weakening the lower end of the line on both sides of the unbroken portion A thickness T4 that is thicker than the remaining thickness T1 of the score constituting the circumferential fracture line and the residual thickness T2 of the axially weakening line, but smaller than the thickness T3 of the non-breaking portion. in particular allowed to to Te, found that it is possible to achieve the above principal object.
[0008]
That is, according to the present invention, the stopper-type synthetic resin container lid that achieves the main technical problem described above has a cylindrical skirt wall, and the skirt wall has a circumferential break line extending in the circumferential direction and the circumferential skirt line. A breaking start line extending from the direction breaking line to the lower end of the skirt wall is formed, and locking means that protrudes radially inward above the circumferential breaking line is formed on the inner circumferential surface of the skirt wall. In the formed stopper made of a stopper type synthetic resin,
The skirt wall further has an axial weakening line extending in the axial direction upward in the axial direction with a width W from the lower end spaced apart from the circumferential breaking line by the gap S in the circumferential direction. The locking means is interrupted by each of the axial weakening lines, and the circumferential break line is interrupted at an angular portion where each of the axial weakening lines exists. are defined breaking portion, circumferential length L of the non-rupture portion is larger than the gap S rather small than the width W (S <L <W) , circumferential direction breaking on both sides of the non-broken section The gap between the line and the lower end of the axial direction weakening line is thicker than the residual thickness T1 of the score constituting the circumferential break line and the residual thickness T2 of the axial direction weakening line. Less than the thickness T3 of the fractured part Having a wall thickness T4, the container closure is provided, characterized in that.
[0009]
In a preferred embodiment, the gap S is 0.1 to 0.5 mm and the circumferential length L is 0.7 to 1.3 mm. The circumferential break line is preferably composed of a score. Preferably, the thickness T3 is 0.9 to 1.5 mm, thick wall T4 is 0.5 to 1.0 mm. The axial weakening line, the score constituting the circumferential break line, and the gap between the circumferential break line and the lower end of the axial weakening line on both sides of the non-breaking portion are within the skirt wall. Conveniently, the residual thickness is reduced by engraving grooves on the peripheral surface. The break start line is constituted by a slit extending from the circumferential break line to the lower end of the skirt wall, and is adjacent to the slit on the downstream end side when viewed in the break direction of the circumferential break line, and the skirt wall It is preferable that a projecting piece projecting downward from the lower end edge is formed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a container lid constructed according to the present invention will be described in more detail with reference to the accompanying drawings.
[0011]
Referring to FIG. 1, the container lid denoted as a whole by the number 2 is integrally formed from an appropriate synthetic resin such as polyethylene or polypropylene. Such a container lid 2 has a circular main wall 4 which extends substantially horizontally. The main wall 4 has an annular main portion 6, a circular immersive portion 8 disposed in the center portion, and a truncated cone cylindrical portion 10 interposed between the main portion 6 and the immersive portion 8. The main portion 6 is formed with a break line 12 which may be an appropriate shape such as a circle or a rectangle in a plan view, and a removal region is defined by the break line 12. The breaking line 12 in the illustrated embodiment is composed of a score formed by reducing the residual thickness. On the upper surface of the main portion 6 in the main wall 4, a connecting column 14 is formed extending upward just inside the fracture line 12, and a ring 16 is connected to the upper end of the connecting column 14. On the upper surface of the main portion 6 of the main wall 4, a substantially cylindrical pouring guide cylinder 18 projecting upward on the outside of the breaking line 12 and a cylindrical shape projecting upward on the outer side of the pouring guide cylinder 18 The mounting cylinder 20 is formed. The distal end portion, that is, the upper end portion of the dispensing guide cylinder 18 is curved outward in the radial direction. A male thread 22 is formed on the outer peripheral surface of the mounting cylinder 20.
[0012]
A substantially cylindrical inner seal wall 24 is formed on the lower surface of the main portion 6 of the main wall 4 and hangs downward on the outer side of the fracture line 12. An outer skirt wall 26 is also formed on the lower surface of the main portion 6 of the main wall 4 so as to hang downward from the peripheral edge thereof.
[0013]
Continuing the description with reference to FIGS. 1 to 3, the skirt wall 26 is formed with a circumferential break line 28 extending in the circumferential direction. In the illustrated embodiment, the circumferential break line 28 is interrupted by seven unbroken portions 30 having a relatively short circumferential length L. Except for the portion interrupted by the non-breaking portion 30, the circumferential break line 28 has a score formed by reducing the residual wall thickness, in particular, a groove formed on the inner peripheral surface of the skirt wall 26 to remain. A score formed by reducing the wall thickness is preferred. The non-breaking portion 30 has a normal thickness. In other words, the non-breaking portion 30 is not reduced in thickness. Each of the non-breaking portions 30 is positioned corresponding to each of the axial direction weakening lines described later. In the illustrated embodiment, a non-breaking region 32 is also defined between the ends of the circumferential break line 28 over an angular range of 5 to 15 degrees and thus having a relatively long circumferential length. The non-breaking region 32 also has a normal thickness similarly to the non-breaking portion 30. In other words, the thickness is not reduced even in the non-breaking region 32. If desired, the non-breaking region 32 can be omitted, and the circumferential break line 28 can be continuously extended over the entire circumferential direction except for the interruption by the non-breaking portion 30. As clearly shown in FIG. 2, a rupture start line 34 is also formed in the skirt wall 26. The break start line 34 is formed by a slit extending from the circumferential break line 28 to the lower end of the skirt wall 26, and its main part is inclined downward in the circumferential direction on one side (left side in FIG. 2) and linearly. It extends. A projecting piece 36 that protrudes downward from the lower end edge of the skirt wall 26 is formed on the downstream side in the breaking direction of the circumferential breaking line 28 so as to be adjacent to the slit constituting the breaking start line 34. Convenient.
[0014]
The skirt wall 26 is further formed with a locking means 38 that protrudes radially inward immediately above the circumferential break line 28. The locking means 38 in the illustrated embodiment is constituted by a ridge that continuously extends over the entire circumference in the circumferential direction except for a portion where an axial direction weakening line to be described later is formed. The cross-sectional shape of the ridge constituting the locking means 38 may be a substantially semicircular shape. The skirt wall 26 is also formed with additional locking means 40 that protrudes radially inward below the circumferential break line 28. The additional locking means 40 extends continuously over the entire circumferential direction except for the interruption at the portion where the break start line 34 exists. The cross-sectional shape of the ridge constituting the additional locking means 40 may be substantially semicircular.
[0015]
Referring to FIGS. 3 to 5 together with FIG. 1, in the container lid 2 constructed according to the present invention, the skirt wall 26 is further provided with a lower end spaced apart from the circumferential break line 28 by a gap S. It is important that a plurality of axially weakening lines 42 having a width W and extending upward in the axial direction are formed at intervals in the circumferential direction. In the illustrated embodiment, seven axial weakening lines 42 are formed, and each of the seven axial weakening lines 42 has a circumferential position where the seven non-ruptures interrupt the circumferential break line 28. It is aligned with the part 30. In other words, it is preferable that the width direction of the axial direction weakening line 42, that is, the center in the circumferential direction is matched with the center in the circumferential direction of the non-breaking portion 30. In the illustrated embodiment, the axial direction weakening line 42 is not arranged in the portion where the non-breaking region 32 exists, and the circumferential interval between the axial direction weakening lines 42 located on both sides of the non-breaking region 32 is as follows. Although somewhat larger than the normal spacing between adjacent axial weakening lines 42, the circumferential spacing between other adjacent axial weakening lines 42 except for such circumferential spacing is substantially the same. The circumferential length L of the non-breaking portion 30 that interrupts the circumferential break line 28 is larger than the gap S between the circumferential break line 28 and the lower end of the axial weakening line 42, but the axial weakening line 42 has the above. It is important that the width is smaller than the width W (S <L <W). The gap S is preferably about 0.1 to 0.5 mm, and the circumferential length L is preferably about 0.7 to 1.3 mm. Each of the axial weakening lines 42 has a score, in particular a skirt wall, extending from the lower end spaced apart from the circumferential break line 28 by the gap S substantially vertically upwardly beyond the locking means 38 in the axial direction. It is preferable that a score is formed by engraving a groove on the inner peripheral surface of 26 to reduce the residual thickness. Accordingly, the ridge constituting the locking means 38 is interrupted by each of the axial direction weakening lines 42. If desired, the groove is formed on the outer peripheral surface of the skirt wall 26 in place of, or in addition to, the groove on the inner peripheral surface of the skirt wall 26 to reduce the residual thickness. The axial direction weakening line 42 can also be formed from the obtained score. In this case as well, it is necessary to interrupt the protrusions constituting the locking means 38 at the site where the axial direction weakening line 42 exists. Furthermore, the axial direction weakening line 42 can also be comprised from the combination of a slit or a slit, and a score instead of a score.
[0016]
As clearly understood by referring to FIGS. 3 and 4, the gap portion 44 between the circumferential break line 28 and the lower end of the axial weakening line 42 on both sides of the non-break portion 30 is also provided on the skirt wall 26. It is important that the wall thickness is reduced compared to the normal part, preferably the wall thickness is reduced by engraving grooves on the inner peripheral surface of the skirt wall 26. The thickness T4 of the gap portion 44 is thicker than the residual thickness T1 of the score constituting the circumferential fracture line 28 and the residual thickness T2 of the axial weakening line 42, and is larger than the residual thickness T3 of the non-breaking portion 30. that has been caused to small. The wall thickness T3 is preferably about 0.9 to 1.5 mm, and the wall thickness T4 is preferably about 0.5 to 1.0 mm. If the thickness T4 of the gap portion 44 is excessively thick, the gap portion 44 tends not to be broken as required when the circumferential break line 28 is broken as described later, and the thickness T4 of the gap portion 44 is reduced. If it is excessively thin, the locking means 38 has a radius due to the axially weakening line 42 extending relatively easily in the circumferential direction when the container lid 2 is attached to the mouth and neck of the container as described below. There is a tendency that the container lid 2 is relatively easily displaced outward in the direction, and therefore the holding of the container lid 2 against the mouth-neck portion is not always sufficient. The thickness T1 and the thickness T2 of the gap portion 44 may be about 0.1 to 0.4 mm.
[0017]
The usage pattern of the container lid 2 described above will be described. The container lid 2 is applied to a container having a mouth and neck portion 46 indicated by a two-dot chain line in FIG. A container that can be formed from a suitable synthetic resin such as glass or polyethylene terephthalate has a cylindrical mouth-neck portion 46 with an open top surface. An upper annular ridge 48 and a lower annular ridge 50 that extend continuously over the entire circumference are formed on the outer peripheral surface of the neck portion 46. The upper annular ridge 48 is positioned at the upper end of the outer peripheral surface of the mouth and neck portion 46, and the lower annular ridge 50 is positioned somewhat below the upper annular ridge 50. When the container lid 2 is attached to the mouth / neck portion 46 and the mouth / neck portion 46 is sealed, the container lid 2 is fitted on the mouth / neck portion 46, and more specifically, the skirt wall 26 of the container lid 2 is attached to the mouth / neck portion. 46, and the container lid 2 is pressed downward. As a result, the locking means 38 formed on the inner peripheral surface of the skirt wall 26 elastically rides over the annular locking ridge 48 formed on the outer peripheral surface of the mouth-and-neck portion 46, and the annular locking ridge 48. Further, the additional locking means 40 formed on the inner peripheral surface of the skirt wall 26 elastically rides over the annular locking protrusion 50 formed on the outer peripheral surface of the mouth-and-neck portion 46 to form an annular shape. The container lid 2 is locked to the mouth / neck portion 46 by being locked by the locking protrusion 50. When the container lid 2 is thus attached to the mouth / neck portion 46, the container lid 2 is held sufficiently securely by the mouth / neck portion 46. Since the skirt wall 26 includes a portion below the locking means 38, that is, a portion below the circumferential break line 28, the locking means 38 is sufficiently reliably prevented from being displaced radially outward. Or the container lid 2 is securely held in the mouth-neck portion 46. A plurality of axial weakening lines 42 are formed on the skirt wall 26, and the circumferential break lines 28 are interrupted by the non-breaking portions 30 corresponding to each of the axial weakening lines 42. The axial weakening line 42 extends in the circumferential direction and the locking means 38 is prevented from being displaced radially outwardly with sufficient reliability. Further, an outer lid 52 is attached to the container lid 2 as indicated by a two-dot chain line in FIG. The outer lid 52 has a circular top wall 54 and a cylindrical skirt wall 56 depending from the periphery of the top wall 54. A female thread 58 is formed on the inner peripheral surface of the skirt wall 56. The outer lid 52 is detachably mounted on the container lid 2 by screwing the female thread 58 to the male thread 22 formed on the mounting wall 20 of the container lid 2.
[0018]
When consuming the contents of the container 2, the outer lid 52 is detached from the container lid 2. Next, the ring 16 attached to the main wall 4 of the container lid 2 is pulled with a finger to break the break line 12 to remove the removal region defined in the break line 12 and discharge to the main wall 4. Create an opening. Thereafter, the contents of the container, such as a liquid seasoning, can be discharged through the discharge opening, for example, by tilting the container. The dispensing guide cylinder 18 guides the outflow of the discharged contents.
[0019]
When discarding the container and the container lid 2 after consuming all the contents of the container, it is desirable to remove the container lid 2 from the mouth-and-neck portion 46 of the container for so-called separate collection. At this time, the protruding piece 36 protruding downward from the lower end of the skirt wall 26 is grasped with a finger and pulled to the right in FIG. Then, the fracture of the circumferential fracture line 28 proceeds in the circumferential direction after the fracture start line 34 and reaches one side of the non-breaking portion 30. After that, the circumferential length L of the non-breaking portion 30 is made larger than the gap S and smaller than the width W, and the circumferential breaking line 28 and the axial weakening line 42 on both sides of the non-breaking portion 42. The thickness T4 of the gap portion 44 between the lower end of each of the two portions is larger than the residual thickness T1 of the score constituting the circumferential fracture line 28 and the residual thickness T2 of the axial weakening line 42, but the non-breaking portion 30 Since the strength of the gap portion 44 is set to be smaller than the strength of the non-breaking portion 30, the gap portion 44 is broken in the axial direction on one side of the non-breaking portion 30. Next, the axial weakening line 42 is broken in the circumferential direction due to the vicinity of the protruding piece 36 being pulled in the circumferential direction. Further, on the other side of the non-breaking portion 30, the gap portion 44 is broken in the axial direction. Thus, the breakage of the axial weakening line 42 interrupted by the non-breaking portion 30 bypasses the non-breaking portion 30, and the gap portions 44 are broken in the axial direction on both sides of the non-breaking portion 30, and between the gap portions 44. The axial weakening line 42 is broken in the circumferential direction, and the breaking of the circumferential break line 28 is gradually advanced. When breakage of the circumferential break line 28 progresses, the locking of the additional locking means 40 of the container lid 2 with respect to the lower annular protrusion 50 of the mouth-and-neck portion 46 is released. In the illustrated embodiment, there is a non-breaking region 32 having a relatively long circumferential length. Therefore, as shown in FIG. 6, even if the circumferential break line 28 is broken, the portion of the skirt wall 26 below the circumferential break line 28 is located above the circumferential break line 28 via the non-breaking region 32. Continue to be connected to the part. Thereafter, a portion extending in a strip shape below the circumferential break line 28 in the skirt wall 26 is appropriately grasped and pulled upward. Thus, the skirt wall 26 is extended in the circumferential direction in each of the axial direction weakening lines 42, or the axial direction weakening line 42 is at least partially from the lower end of at least a part of the plurality of axial direction weakening lines 42 as necessary. It is fractured upward in the axial direction. Therefore, the locking means 38 formed on the skirt wall 26 can be displaced relatively outward in the radial direction, and the locking means 38 of the container lid 2 is also attached to the mouth-neck portion 46 of the container. It is released from the formed annular locking ridge 48. Accordingly, the entire container lid 2 can be relatively easily detached from the mouth / neck portion 46 of the container by pulling the portion extending in a strip shape below the circumferential break line 28 in the skirt wall 26 further upward. it can. When the non-breaking region 32 is not provided, when the circumferential break line 28 is broken, the portion of the skirt wall 26 below the circumferential break line 28 is completely separated from the portion above it. Is done. In this case, after the circumferential break line 28 is broken, for example, the lower end of the skirt wall 26 remaining on the mouth / neck portion 46 of the container, that is, the cut portion of the circumferential break line 28 is put on the finger The container lid 2 can be detached from the mouth / neck portion 46 of the container.
[0020]
【The invention's effect】
According to the container lid configured in accordance with the present invention, in a normal state where the container lid is attached to the mouth and neck of the container, the container lid is sufficiently prevented and controlled from being detached from the mouth and neck of the container. However, when removing the container lid from the container neck and neck for separate collection, the container lid can be easily removed from the container neck and neck without requiring a special tool. be able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a preferred embodiment of a container lid constructed in accordance with the present invention.
FIG. 2 is a front view of the container lid shown in FIG.
3 is an enlarged perspective view showing the vicinity of an axial direction weakening line in the container lid shown in FIG. 1; FIG.
4 is a partial cross-sectional view taken along line AA in FIG.
FIG. 5 is a partial cross-sectional view taken along line BB in FIG. 1;
6 is a front view showing the container lid shown in FIG. 1 in a state in which a circumferential break line is broken. FIG.
[Explanation of symbols]
2: Container lid 26: Skirt wall 28: Circumferentially broken line 30: Non-ruptured part 36: Protruding piece 38: Locking means 42: Axial weakening line 44: Gap part

Claims (6)

The skirt wall has a circumferential rupture line extending in the circumferential direction and a rupture start line extending from the circumferential rupture line to the lower end of the skirt wall. On the peripheral surface, a stopper means that protrudes radially inward above the circumferential break line is formed.
The skirt wall further has an axial weakening line extending in the axial direction upward in the axial direction with a width W from the lower end spaced apart from the circumferential breaking line by the gap S in the circumferential direction. The locking means is interrupted by each of the axial weakening lines, and the circumferential break line is interrupted at an angular portion where each of the axial weakening lines exists. are defined breaking portion, circumferential length L of the non-rupture portion is larger than the gap S rather small than the width W (S <L <W) , circumferential direction breaking on both sides of the non-broken section The gap between the line and the lower end of the axial direction weakening line is thicker than the residual thickness T1 of the score constituting the circumferential break line and the residual thickness T2 of the axial direction weakening line. Less than the thickness T3 of the fractured part Having a wall thickness T4, the container closure, characterized in that.   The container lid according to claim 1, wherein the gap S is 0.1 to 0.5 mm, and the circumferential length L is 0.7 to 1.3 mm.   The container lid according to claim 1, wherein each of the circumferential break lines is composed of a score. The container lid according to any one of claims 1 to 3 , wherein the wall thickness T3 is 0.9 to 1.5 mm, and the wall thickness T4 is 0.5 to 1.0 mm. The axial weakening line, the score constituting the circumferential break line, and the gap between the circumferential break line and the lower end of the axial weakening line on both sides of the non-breaking portion are within the skirt wall. The container lid according to any one of claims 1 to 4 , wherein the residual thickness is reduced by forming a groove in the peripheral surface. The break start line is constituted by a slit extending from the circumferential break line to the lower end of the skirt wall, and is adjacent to the slit on the downstream side when viewed in the break direction of the circumferential break line. The container lid according to any one of claims 1 to 5 , wherein a protruding piece protruding downward from the lower end edge is formed.

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