JP2016216106A - Synthetic resin cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin cap which enables a tamper-evident band to be smoothly broken as the cap is opened to improve the cap opening operability.SOLUTION: A cap 1 includes: a skirt wall 3 provided with a female screw 5 which threadedly engages with a male screw formed at an outer periphery of a container mouth part; and a tamper-evident band 7 connected to a lower part of the skirt wall 3. A small width part 10 having a small vertical width is formed at the tamper-evident band 7 and a score line 11 is provided at the small width part 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a synthetic resin cap that is attached to the mouth of a container that contains contents such as beverages.

  2. Description of the Related Art As a cap that is attached to a mouth portion of a container that stores contents such as beverages, a cap that can be confirmed at a glance whether or not it is opened is widely used. As such a cap, there is known a cap provided with a cap body having a skirt wall provided with a female screw to be engaged with a male screw of a container mouth portion, and a tamper evidence band connected to the lower side of the skirt wall via a bridge. It has been.

  In the conventional cap described above, a force is applied to the bridge by the locking protrusion of the tamper evidence band being locked to the bead portion of the container mouth portion by the opening operation from the state where it is attached to the container mouth portion. The bridge is broken, and the cap body and the tamper evidence band are separated from each other. Therefore, by visually confirming whether or not the bridge is broken, it can be easily confirmed whether or not the opening operation has been performed.

  And the cap described in patent document 1 can perform the operation | work which removes a tamper-evidence band from a container opening | mouth part after opening and can confirm the presence or absence of opening operation. That is, two axial cutting lines are provided on the upper part of the tamper evidence band of the cap at a position sandwiching a high-strength bridging portion that connects 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 container mouth.

JP-A-61-2355

  However, in the above cap, the vertical width of the relatively thin portion below the axial cutting line is longer, and it takes time to complete the breaking of the thin portion. There is a problem that it becomes a resistance element and the workability of the opening operation is lowered. Moreover, even if the axial cutting line is lengthened, this problem cannot be solved. This is because when the axial cutting line is lengthened, the tendency of the axial cutting line to work to alleviate the shearing force applied to the thin portion of the lower part of the tamper evidence band as the cap body moves is increased. This is because it takes time to complete the breaking of the portion.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is to provide a cap made of a synthetic resin capable of realizing good breakage of the tamper evidence band accompanying opening and 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 skirt wall provided with a female screw to be engaged with a male screw formed on the outer periphery of a container mouth, and a lower part of the skirt wall. A cap having a tamper evidence band, wherein the tamper evidence band is formed with a small width portion having a small vertical width, and a score is provided in the small width portion (claim 1).

  In the synthetic resin cap, a separation bridge that connects the narrow portion and the skirt wall may be provided (Claim 2).

  In the synthetic resin cap, on the inner peripheral side of the tamper evidence band, there are provided a plurality of locking protrusions for locking to an annular protrusion formed below the male screw on the outer periphery of the container mouth, and the score The locking projection does not have to be provided at a position corresponding to the inner peripheral side.

  In the present invention, a synthetic resin cap capable of realizing good breakage of the tamper evidence band accompanying opening and improving the opening operation is obtained.

  If the tamper evidence band has a substantially uniform vertical width over the entire circumference, and a score is provided for this tamper evidence band, the time from the start of the cap opening operation until the break of the tamper evidence band is completed. Accordingly, there arises a problem that the resistance caused by the tamper evidence band adversely affects the opening operation. However, in the synthetic resin cap according to each claim of the present application, a narrow portion is formed in a part of the tamper evidence band, and a score is provided there. ) Realization of breakage, and thus improvement in the opening operability.

  In the synthetic resin cap according to the second aspect of the present invention, when the cap is opened, the score is broken and connected to the skirt wall via the separation bridge as the skirt wall is detached from the container mouth. The tamper evidence band can be automatically removed from the container mouth, and the tamper evidence band can be easily and reliably removed from the container mouth.

  In the synthetic resin cap of the invention according to claim 3, when the cap is opened, the portion where the locking protrusion is not provided in the tamper evidence band (that is, the portion where the score is provided) is more than the other portion. At first, it tries to move in the direction of coming out of the container mouth, and the difference in this movement becomes a shearing force that acts on the score, so that the completion of the breaking of the score is achieved earlier, so the opening operability is improved. Further improvement can be achieved.

1 is a front view of a synthetic resin cap according to an embodiment of the present invention. It is a bottom view of the cap. It is a rear view of the 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 the A part in FIG. 5, (B)-(D) is a longitudinal cross-sectional view which expands and shows the BD part in FIG. (A) And (B) is explanatory drawing which shows roughly the fracture | rupture 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 a mouth portion of a container (not shown) such as a PET bottle, for example, by compression molding or injection molding. It is molded integrally with. In addition, the raw material which forms the cap 1 is not specifically limited, Polypropylene etc. other than the polyethylene used by this embodiment are used suitably.

  The cap 1 has a substantially circular top wall 2 (particularly see FIG. 4) and a substantially cylindrical skirt wall 3 (particularly see FIG. 5) extending downward from the outer periphery of the top 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 is connectable with the external thread (not shown) formed in the outer periphery of the part.

  Further, the cap 1 is a pill fur proof cap having a function of proving that it has not been opened (that has never been opened), and the lower part of the skirt wall 3 is shown in FIG. 1, FIG. 3, FIG. As shown in FIG. 6A, a tamper evidence band (hereinafter simply referred to as “band”) 7 is connected through a plurality of bridges 6.

  That is, a plurality of (in this example, a total of 10) bridges 6 are formed at predetermined intervals along the circumferential direction at the boundary between the skirt wall 3 and the band 7. The plurality of bridges 6 connect the skirt wall 3 and the band 7 to each other, and are broken when pulled by a predetermined force. The band 7 is formed in a cylindrical shape whose diameter is slightly increased as it goes downward.

  As shown in FIGS. 2 and 5, a plurality of locking projections (flaps) 8 extending inward and upward are intermittently provided on the inner peripheral side of the band 7 along the circumferential direction. It is. 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 mouth portion in a state where the cap 1 is attached to the container mouth portion. It is locked to the annular protrusion by opening operation.

  As shown in FIGS. 1, 3, and 6B, a plurality of protective spacers 9 are provided on the upper end surface of the band 7 at an appropriate position avoiding the bridge 6, and the cap 1 is arranged in the vertical direction. Even when a force to press and contract is applied, the presence of the protective spacer 9 does not narrow the gap between the skirt wall 3 and the band 7 beyond a certain level, and the bridges 6 are thereby broken. There is nothing. 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 narrow part 10 whose vertical width is smaller than the other site | part is formed in the band 7, and a part of the band 7 of the state connected cyclically | annularly in this narrow part 10 Is provided with a thin-walled score (weakening portion) 11 (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 does not have to 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 is, the easier it is to break the score 11 at the time of opening. On the other hand, when the cap 1 is attached to the container mouth portion, the score 11 is The risk of breakage also increases, and the vertical 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, whereas the vertical width W10 of the small width portion 10 is 0.2 mm (5% of the vertical width W7) to 3.2 mm ( 80% of the vertical width W7), and preferably 2 mm (50% of the vertical width W7) or less, and in this example 1.2 mm. However, the vertical width W7 of the band 7 is not limited to 4 mm. If the size, material strength, shape, score 11 and the like of the vertical width W7 of the band 7 are significantly different from the present example, The width W10 can vary. Moreover, the ratio (angle) of the narrow part 10 occupying the entire circumference of the band 7 (360 °) can be, for example, 10/360 (10 °) to 324/360 (324 °).

  If the band 7 has a substantially uniform vertical width over the entire circumference, and if the band 7 is provided with a score 11, it takes time from the start of the cap 1 opening operation until the breaking of the band 7 is completed. Accordingly, there arises a problem that the resistance generated by the band 7 adversely affects the opening operation. However, in this embodiment, since the narrow 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 due to the opening is realized, and the opening is thus opened. The stopper operability can be improved.

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

  Further, in the present embodiment, when the plurality of locking protrusions 8 are provided on the inner peripheral side of the band 7, the locking protrusions 8 are not provided at positions corresponding to the inner peripheral side of the score 11, and the band is not 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. As described above, when a 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 part which is not made (that is, the part where the score 11 is provided) tries to move in the direction of coming out of the container mouth part earlier than the other part, and this difference in movement acts as a shearing force on the score 11, Completion of the break of the score 11 will be achieved earlier. Accordingly, it is possible to further improve the opening operability.

  Moreover, in this embodiment, as shown in FIG. 1 and FIG. 2, this point is located immediately in front of the opening direction OP (spinning direction when opening) OP in the narrow portion 10 of the band 7, The locking protrusion 8 is not provided on the inner peripheral side of the action part 10A to which the separation bridge 12 is connected, and the locking protrusion 8 is provided on the inner peripheral side of the fixing part 10B located immediately behind the opening direction OP of the score 11. I am trying to provide it. Therefore, when the cap 1 is opened, the movement of the skirt wall 3 to be detached from the container mouth is efficiently transmitted to the action site 10A via the relatively thick separation bridge 12, and the action site 10A Since the locking protrusion 8 does not exist on the inner peripheral side, the movement of the action site 10 </ b> A to be detached from the container mouth is not easily inhibited by the locking protrusion 8. On the other hand, when looking at the fixing portion 10B, there is no bridge 6 located closer to the fixing portion 10B than the sorting bridge 12, and the locking projection 8 is provided on the inner peripheral side of the fixing portion 10B. Since it is provided, the force to remain in the container mouth portion acts strongly on the fixing portion 10B. In this way, when opening, the action site 10A has a strong force to detach from the container mouth portion, and the fixed portion 10B has a strong force remaining in the container mouth portion. The score 11 positioned at is easily broken very early.

  In addition, it is preferable that the area | region which loses the latching protrusion 8 in the perimeter of the band 7 shall be 30 degrees-90 degrees. If the angle is less than 30 °, it is difficult to obtain the effect of the early break of the score 11 described above. If the angle exceeds 90 °, the locking protrusion 8 of the band 7 is difficult to be locked to the bead portion of the container mouth when opening. And in this embodiment, although the area | region which loses the latching protrusion 8 in the perimeter of the 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 FIGS. 6D and 7A (see also FIG. 1), the separation bridge 12 is thinner toward the upper side. Therefore, after the cap 1 is opened, when the band 7 connected to the skirt wall 3 is torn off in the cap 1 detached from the container mouth portion, as shown in FIG. Break. And, there is a possibility that burrs may occur on the fracture surface of the sorting bridge 12 due to this breakage, but the connection part 3A where the upper end of the sorting bridge 12 is connected to the skirt wall 3 has a concave shape on the upper side. The burrs on the lower surface of the upper part 12A of the separation bridge 12 connected to the skirt wall 3 side are accommodated inside the recessed connection part 3A, so that the fingers with the skirt wall 3 are prevented from touching the burrs and being damaged. can do. On the other hand, since the torn band 7 is usually discarded as it is, the formation of burrs on the upper surface of the lower part 12B of the sorting bridge 12 connected to the band 7 side after the breakage is not a problem.

  Moreover, in this embodiment, as shown in FIG. 1, the score 11 provided in the narrow portion 10 of the band 7 is positioned immediately in front of the closing bridge 12 in the closing direction (direction rotating when closing) CL. Therefore, at the time of closing, the score 11 is advanced by being pushed from behind to the action site 10A to which the sorting bridge 12 is connected, and therefore, the breakage at the time of closing is less likely to occur.

  In addition, this invention is not limited to said embodiment at all, Of course, it can change and implement variously in the range which does not deviate from the summary of this invention. For example, the following modifications can be given.

  In the above-described 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 is immediately The bridge 6 located at the front is made the thickest, the other bridge 6 is made the thinnest, and the thickness of the bridge 6 between the two is gradually changed so that all the bridges 6 are broken in order at the time of opening. You may comprise.

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

  In the example shown in FIG. 1, the narrow portion 10 is formed by making the lower end of the band 7 flush with each other and lowering the upper end of a part of the band 7, together with a part of the skirt wall 3 (above the narrow portion 10. However, the present invention is not limited to this. For example, the narrow portion 10 may be formed at a position slightly raised from the lower end of the band 7 as shown in FIG.

  In the example shown in FIG. 1, the score 11 is provided in the middle part of the small width part 10. However, the present invention is not limited to this, and as shown in FIG. 9, the score 11 is provided in the end part of the small width part 10. Also good.

  Further, in the example shown in FIG. 1 and FIG. 7A, the connecting portion 3A where the upper end of the sorting bridge 12 is connected to the skirt wall 3 has a concave shape on the upper side. As shown in the figure, 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 the protective spacer 9 is provided in the vicinity of the left and right of the connecting portion 3A, the connecting portion 3A. Even if it forms flat, the effect similar to the case shown to FIG.1 and FIG.7 (A) which made the connection part 3A the shape dented on the upper side is acquired.

  FIG. 5 shows an example in which the cap 1 is a so-called one-piece cap having no separate packing. However, the cap 1 is a so-called two-piece cap having a separate packing. Also good.

  Although the internal thread 5 of the said embodiment is a triple thread, it is not restricted to this, The internal thread 5 may be a single thread, a double thread, etc.

  Needless to say, the modifications 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 7 Band 8 Locking protrusion 9 Protection spacer 10 Narrow width part 10A Action part 10B Fixing part 11 Score 12 Sorting bridge 12A Upper part 12B Lower part W7 Up and down of the band Width W10 Vertical width of the narrow part

Claims (3)

A cap provided with a skirt wall provided with a female screw that engages with a male screw formed on the outer periphery of the container mouth, and a tamper evidence band connected to a lower portion of the skirt wall,
A synthetic resin cap characterized in that a narrow portion having a small vertical width is formed in the tamper evidence band, and a score is provided in the narrow portion.   The synthetic resin cap according to claim 1, wherein a separation bridge that connects the narrow portion and the skirt wall is provided.   Provided on the inner peripheral side of the tamper-evidence band are a plurality of locking protrusions that are engaged with annular protrusions formed below the male screw on the outer periphery of the container mouth, and correspond to the inner peripheral side of the score. The synthetic resin cap according to claim 1 or 2, wherein the locking projection is not provided at a position.

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