JP6538422B2 - Synthetic resin cap - Google Patents

Description

  The present invention relates to, for example, a synthetic resin cap attached to the mouth of a container for containing contents such as beverages.

  As a cap attached to the mouth of a container for containing contents such as a beverage, one having a structure capable of checking the presence or absence of opening at a glance is widely used. Such a cap is known to have a cap body having a skirt wall provided with an internal thread to be screwed into the external thread of the container opening, and a tamper evidence band connected via a bridge below the skirt wall. It is done.

  In the above-mentioned conventional cap, a force acts on the bridge by the locking projection of the tamper evidence band being locked to the bead portion of the container opening by the opening operation from the state of being attached to the container opening. The bridge is broken and the cap body and the tamper evidence band are separated from one another. Therefore, by visually recognizing the presence or absence of breakage of the bridge, it can be easily confirmed whether the opening operation has been performed.

  And the cap described in patent document 1 can confirm the presence or absence of opening operation, and can perform the operation which removes a tamper evidence band from a container mouth after opening, without using a tool. That is, two axial cutting lines are provided on the upper side of the tamper evidence band of this cap at a position sandwiching the high strength bridge connecting the cap body and the tamper evidence band. Not only the evidence band and the cap body are separated, but also the tamper evidence band can be removed from the mouth of the container.

Japanese Patent Application Laid-Open No. 61-21355

  However, in the above-mentioned cap, the vertical width of the relatively thin portion below the axial cutting line is long, and it takes time to complete the breaking of the thin portion, during which the tamper evidence band is not broken There is a problem that it becomes a resistance element and reduces the workability of the opening operation. Also, increasing the axial cutting line does not solve this problem. This is because when the axial cutting line is lengthened, the axial cutting line tends to act to relieve the shear force applied to the thin portion of the lower portion of the tamper evidence band with the movement of the cap body, which is also thin. This is because it takes time to complete the breakage of the part.

  The present invention has been made in consideration of the above-mentioned matters, and its object is to realize a good breaking of the tamper evidence band accompanied by the opening, and to make the synthetic resin cap capable of improving the opening operability. It is to provide.

In order to achieve the above object, a synthetic resin cap according to the present invention is connected to a lower portion of a skirt wall provided with an internal thread screwed to an external thread formed on the outer periphery of a container opening. a cap; and a tamper evidence band, the form small small width portion of the vertical width tamper evidence band, Ri Oh provided a score to the small width portion, for separating connecting the said small width portion and the skirt wall A bridge is provided, and the separating bridge is tapered toward the upper side, and a connection site to which the upper end of the separating bridge is connected in the skirt wall has a concave shape on the upper side, or In the vicinity of the left and right, a protective spacer is provided which protrudes downward from the lower end surface of the skirt wall (claim 1).

In the synthetic resin cap, a plurality of locking projections are provided on the inner peripheral side of the tamper evidence band at the outer periphery of the container opening and engaged with an annular projection formed lower than the male screw, and the score The locking projection may not be provided at a position corresponding to the inner circumferential side of the (3).

In the synthetic resin cap, the locking projection is not provided on the inner peripheral side of the action site which is located forward of the opening direction of the score in the small width portion, and the score is open provided the locking projection on the inner circumferential side of the fixed site located behind the plug direction rather good also (claim 3), and in this case, the a portion other than the small width portion of the tamper evidence band skirt wall A plurality of bridges, which break at the time of opening and opening, are formed at intervals along the circumferential direction, and at the time of opening, the separation bridge maintains the state of connecting the narrow width portion and the skirt wall. It may be configured such that there is no bridge located closer to the fixed site than the sorting bridge (claim 4) .

  In the present invention, it is possible to obtain a synthetic resin cap capable of achieving good breakage of the tamper evidence band accompanying opening and improving the opening operability.

  If the tamper evidence band has a substantially uniform upper and lower width all around the circumference and the tamper evidence band is scored, it takes time from the start of the opening operation of the cap to the completion of the breakage of the tamper evidence band. The problem is that resistance caused by the tamper evidence band adversely affects the opening operation. However, in the synthetic resin cap of the invention according to each claim of the present application, a small width portion is formed in a part of the tamper evidence band and a score is provided there, so that the tamper evidence band associated with opening is good (early ) It is possible to realize breakage and to improve the opening operability.

In the synthetic resin cap of the invention according to claim 1 , when the cap wall is opened from the container opening when the cap is opened, the score is broken and the skirt wall is connected to the skirt wall through the separation bridge. The tamper evidence band can be automatically removed from the container opening, and the removal operation of the tamper evidence band from the container opening can be performed easily and reliably.

In the synthetic resin cap of the invention according to claim 2 , at the time of opening the cap, in the tamper evidence band, the portion where the locking projection is not provided (that is, the portion where the score is provided) is more than other portions. The difference in the movement acts as a shear force on the score, and completion of the score breaking is achieved earlier, so that the opening operability is improved. It is possible to further improve.

It is a front view of the synthetic resin cap concerning one embodiment of the present invention. It is a bottom view of the said cap. It is a rear view of the said cap. It is a top view of the said cap. It is a longitudinal cross-sectional view of the said cap. (A) is an enlarged view of A part in FIG. 5, (B)-(D) is a longitudinal cross-sectional view which expands and shows the B-D part in FIG. (A) and (B) is explanatory drawing which shows roughly the fracture process of the principal part of the said cap. It is a front view which shows the modification of the said cap. It is a front view which shows the other modification of the said cap.

  Embodiments of the present invention will be described below with reference to the drawings.

  A synthetic resin cap (hereinafter referred to as a cap) 1 shown in FIGS. 1 to 5 is used by being attached to the mouth of a container (not shown) such as a PET bottle, for example, and is made of polyethylene by compression molding or injection molding. Are integrally molded. In addition, the raw material which forms the cap 1 is not specifically limited, In addition to the polyethylene used by this embodiment, a polypropylene etc. are used suitably.

  Then, the cap 1 has a ceiling wall 2 having a substantially circular shape (in particular, see FIG. 4) and a substantially cylindrical skirt wall 3 (in particular, see FIG. 5) extending downward from the outer periphery of the ceiling wall 2 in plan view. doing. Here, a knurled groove 4 (see FIGS. 1, 3 and 4) is provided on the outer peripheral surface of the skirt wall 3, and a female screw 5 (see FIG. 5) is provided on the inner peripheral surface. It can be coupled to an external thread (not shown) formed on the outer periphery of the part.

  In addition, the cap 1 is a pill fur proof cap having a function of proving unopened (unopened), and the lower portion of the skirt wall 3 is shown in FIG. 1, FIG. 3, FIG. 5, FIG. As shown in 6 (A), tamper evidence bands (hereinafter simply referred to as “bands”) 7 are connected via a plurality of bridges 6.

  That is, at the boundary between the skirt wall 3 and the band 7, a plurality of (in this example, a total of ten) bridges 6 are formed along the circumferential direction at a predetermined interval. The plurality of bridges 6 connect the skirt wall 3 and the band 7 to each other and break when they are pulled by a predetermined force. The band 7 is formed in a cylindrical shape which slightly expands in diameter as it goes downward.

  Then, on the inner peripheral side of the band 7, as shown in FIGS. 2 and 5, a plurality of locking projections (flaps) 8 extending inward and upward are intermittently provided continuously along the circumferential direction. Yes. Each locking projection 8 is positioned substantially below an annular projection (bead portion) (not shown) formed below the male screw on the outer periphery of the container opening, with the cap 1 attached to the container opening. The annular projection is locked by the opening operation.

  In addition, as shown in FIGS. 1, 3 and 6B, a plurality of protective spacers 9 are provided at appropriate positions on the upper end face of the band 7 avoiding the bridge 6, and the cap 1 is vertically arranged. Even if a force is applied to squeeze the gap between the skirt wall 3 and the band 7 due to the presence of the protective spacer 9, the bridges 6 will be broken by this. I have nothing to do. The protective spacer 9 may be provided not on the upper end surface of the band 7 but on the lower end surface of the skirt wall 3.

  And in this embodiment, as shown in FIG. 1, the small width part 10 whose vertical width is smaller than the other parts is formed in the band 7, and a part of the band 7 in a state of being annularly connected to the small width part 10. And a thin-walled score (weakening portion) 11 for developing into a strip shape (see also FIG. 2 and FIG. 6C). The score 11 in this example extends from the upper end to the lower end of the narrow portion 10, but may not extend to the upper end or the lower end.

  Here, the smaller the vertical width W10 (see FIG. 1) of the small width portion 10, the easier it is to break the score 11 at the time of opening, but on the other hand, when the cap 1 is attached to the container opening, the score 11 is The possibility of breakage also increases, and the upper and lower width W10 may be set in consideration of these. For example, the vertical width W7 (see FIG. 1) of the band 7 of this example is 4 mm, while the vertical width W10 of the narrow width portion 10 is 0.2 mm (5% of the vertical width W7) to 3.2 mm It can be 80% of the vertical width W7, preferably 2 mm (50% of the vertical width W7) or less, and is 1.2 mm in this example. However, the upper and lower width W7 of the band 7 is not limited to 4 mm, and the upper and lower widths 10 of the small width portion 10 are preferable when the size, material strength, shape, shape of the score 11, etc. The width W10 can vary. The ratio (angle) of the narrow portion 10 to the entire circumference (360 °) of the band 7 may be, for example, 10/360 (10 °) to 324/360 (324 °).

  Assuming that the band 7 has a substantially uniform vertical width over the entire circumference, and the score 11 is provided to the band 7, it takes time to complete the breaking of the band 7 after the opening operation of the cap 1 is started. Accordingly, there arises a problem that the resistance generated by the band 7 adversely affects the opening operation. However, in the present embodiment, since the small width portion 10 is formed in a part of the band 7 and the score 11 is provided there, a good (early) breakage of the band 7 is realized with the opening of the plug. The plug operability can be improved.

  Further, in the present embodiment, when the bridges 6 connecting the skirt wall 3 with the portion other than the narrow width portion 10 in the band 7 are broken when the cap 1 is opened, the narrow width portion 10 and the skirt wall 3 The separating bridge 12 to be connected is configured to maintain the connected state without breaking, and specifically, the separating bridge 12 is thicker than each bridge 6. With such a configuration, when the cap 1 is opened, the band 11 is connected to the skirt wall 3 through the separation bridge 12 in a state where the score 11 is broken as the skirt wall 3 is detached from the container opening. 7 can be automatically removed from the container opening, and the removal operation of the band 7 from the container opening can be performed easily and reliably.

  Furthermore, in the present embodiment, when providing the plurality of locking projections 8 on the inner peripheral side of the band 7, the locking projections 8 are not provided at positions corresponding to the inner peripheral side of the score 11, and the band is provided at other positions. A plurality of (seven in this example) locking projections 8 are provided at substantially equal intervals in the circumferential direction of 7. Thus, when the portion where the locking projection 8 is not provided on the band 7 is partially provided at a position corresponding to the inner peripheral side of the score 11, the locking projection 8 is provided on the band 7 when the cap 1 is opened. The unintended part (ie, the part where the score 11 is provided) tries to move in the direction of coming out of the container opening before the other parts, and the difference of this movement acts on the score 11 as a shearing force. Completion of the break of score 11 will be achieved earlier. Therefore, further improvement of the opening operability can be achieved.

  Moreover, in this embodiment, as shown in FIGS. 1 and 2, in this embodiment, the small width portion 10 of the band 7 is positioned immediately in front of the opening direction OP of the score 11 (direction of rotation when opening). The locking projection 8 is not provided on the inner peripheral side of the action site 10A to which the sorting bridge 12 is connected, and the locking projection 8 is provided on the inner peripheral side of the fixed site 10B located immediately behind the opening direction OP of the score 11. It is made to provide. Therefore, when the cap 1 is opened, the movement for removing the skirt wall 3 from the container opening is efficiently transmitted to the action site 10A through the relatively thick separation bridge 12 and the action site 10A. Since the locking projection 8 is not present on the inner peripheral side, the movement of the action site 10A to be detached from the container opening is less likely to be inhibited by the locking projection 8. On the other hand, looking at the fixed portion 10B, there is no bridge 6 located closer to the fixed portion 10B than the sorting bridge 12, and the locking projection 8 is formed on the inner peripheral side of the fixed portion 10B. Since it is provided, the force to remain in the container opening works strongly on the fixed portion 10B. As described above, when the container is opened, the force to detach from the container opening acts strongly on the action site 10A, and the force remaining in the container opening acts strongly on the fixed site 10B. Therefore, between the two 10A and 10B A score of 11 is likely to break very early.

  In addition, it is preferable that the area | region which eliminates the latching protrusion 8 in the perimeter of the band 7 shall be 30 degrees-90 degrees. If the angle is less than 30 °, the effect of the early breakage of the score 11 described above is not sufficiently obtained. If the angle exceeds 90 °, the locking projection 8 of the band 7 does not easily lock on the bead portion of the container opening. And in this embodiment, although the field which loses locking projection 8 in the perimeter of band 7 is about 45 degrees, it is good also as about 60 degrees, for example.

  In addition, in the present embodiment, as shown in FIG. 6 (D) and FIG. 7 (A) (see also FIG. 1), the sorting bridge 12 is thinner toward the upper side. Therefore, after opening the cap 1, when the band 7 in a state of being connected to the skirt wall 3 is torn off in the cap 1 separated from the container opening, as shown in FIG. 7 (B) Break. And although there is a risk that burrs will be generated on the fractured surface of the sorting bridge 12 due to this breakage, the connection portion 3A to which the upper end of the sorting bridge 12 is connected in the skirt wall 3 has a concaved shape upwards, The burrs on the lower surface of the upper part 12A of the sorting bridge 12 connected to the skirt wall 3 side fit inside the recessed connection part 3A, thus preventing the fingers with the skirt wall 3 from touching the burrs and damaging them beforehand can do. On the other hand, since it is normal to discard the torn band 7 as it is, the formation of burrs on the upper surface of the lower portion 12B of the separation bridge 12 connected to the band 7 side after the breakage is not very problematic.

  Further, in the present embodiment, as shown in FIG. 1, the score 11 provided in the narrow width portion 10 of the band 7 is positioned immediately in front of the closing direction CL (the direction of rotation at closing time) with respect to the sorting bridge 12. Therefore, at the time of closing, the score 11 is to be pushed from behind to the connected action site 10A of the separating bridge 12, so that breaking at the time of closing is difficult to occur.

  The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be modified in various ways without departing from the scope of the present invention. For example, the following modifications can be mentioned.

  In the above embodiment, the thickness of each bridge 6 may be uniform or non-uniform. For example, of the two bridges 6 formed on both sides of the sorting bridge 12, the opening direction OP immediately Make the bridge 6 located at the front the thickest, make the other bridge 6 the thinnest, and gradually change the thickness of the bridge 6 between the two, so that all bridges 6 break in order at the time of opening. You may configure it.

  In the example shown in FIG. 1, the score 11 provided in the narrow width portion 10 of the band 7 is located immediately in front of the plugging direction CL with respect to the sorting bridge 12, but the plugging direction CL with respect to the sorting bridge 12. It may be located immediately behind the

  In the example shown in FIG. 1, the narrow end 10 is formed by making the lower end of the band 7 flush and lowering the upper end of a part of the band 7, and at the same time a part of the skirt wall 3 (above the narrow width 10). Although the lower end of the portion located at (1) is also lowered, the present invention is not limited to this. For example, as shown in FIG. 8, the narrow portion 10 may be formed at a position slightly lifted from the lower end of the band 7.

  Moreover, in the example shown in FIG. 1, although the score 11 is provided in the middle part of the narrow part 10, it does not restrict to this, as shown in FIG. 9, the score 11 is provided in the edge part of the narrow part 10. It is also good.

  Furthermore, in the example shown in FIG. 1 and FIG. 7 (A), the connection portion 3A where the upper end of the sorting bridge 12 is connected in the skirt wall 3 is concaved upwards, but this is not limitative. As shown, if the protective spacer 9 is formed not on the upper end surface of the band 7 but on the lower end surface of the skirt wall 3 and if the protective spacer 9 is provided near the left and right of the connection portion 3A, the connection portion 3A Even if F is formed flat, the same effect as in the case shown in FIG. 1 and FIG. 7A in which the connection portion 3A is concaved upward can be obtained.

  Although FIG. 5 shows an example in which the cap 1 is a so-called one-piece cap which does not have a separate packing, the present invention is not limited to this. The cap 1 is a so-called two-piece cap having a separate packing It is also good.

  Although the female screw 5 in the above embodiment is a triple thread screw, the present invention is not limited to this, and the female screw 5 may be a single thread screw, a double thread screw or the like.

  It goes without saying that the variations shown in the specification may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 cap 2 top wall 3 skirt wall 3A connection part 4 knurled groove 5 female screw 6 bridge 8 band 8 locking projection 9 protective spacer 10 small width part 10A action part 10B fixed part 11 score 12 sorting bridge 12A upper part 12B lower W7 band upper and lower Width W10 Vertical width of small width part

Claims (4)

A cap comprising: a skirt wall provided with an internal thread to be engaged with an external thread formed on an outer periphery of a container mouth; and a tamper evidence band connected to a lower portion of the skirt wall,
The form small small width portion of the vertical width tamper evidence band, Ri Oh provided a score to the small width portion,
A separation bridge is provided connecting the narrow portion and the skirt wall,
The sorting bridge is thinner towards the top,
In the skirt wall, the connection portion to which the upper end of the sorting bridge is connected has a concave shape on the upper side, or a protective spacer projecting downward from the lower end surface of the skirt wall in the left and right vicinity of the connection portion A synthetic resin cap characterized in that it is provided . A plurality of locking projections are provided on the inner peripheral side of the tamper evidence band at the outer periphery of the container opening and engaged with the annular projection formed below the male screw, and corresponds to the inner peripheral side of the score The synthetic resin cap according to claim 1, wherein the locking projection is not provided at a position . It is located forward of the opening direction of the score in the small width portion, and is not provided with the locking projection on the inner peripheral side of the action site to which the sorting bridge is connected, and is located behind the opening direction of the score. The synthetic resin cap according to claim 2 , wherein the locking projection is provided on the inner peripheral side of the fixed portion . A plurality of bridges are formed at intervals along the circumferential direction, which connect the site other than the small width part in the tamper evidence band and the skirt wall and break at the time of opening.
At the time of opening, the separation bridge is configured to maintain a state in which the narrow portion and the skirt wall are connected;
The synthetic resin cap according to claim 3, wherein the bridge located closer to the fixing site than the sorting bridge is not present.

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