JP6564141B2 - Plastic cap - Google Patents

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.

  As a cap attached to the mouth of a container for storing 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, 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 a lower portion of the skirt wall via an annular weakening portion It has been known.

  In the conventional cap described above, the hook (locking means) provided on the inner periphery of the tamper evidence band is attached to the outer periphery of the container mouth portion in accordance with the opening operation (first opening operation) from the state where it is attached to the container mouth portion. After locking the ring-shaped protrusion (locking jaw) provided on the bridge, the bridge (bridge) formed between the perforated slits that define the tamper-evidence band and the skirt wall is broken, and the cap body And the tamper evidence band are separated from each other (see Patent Document 1). Therefore, it is possible to easily confirm whether or not the opening operation has been performed by visually confirming whether or not the bridge constituting the annular weakened portion is broken.

Japanese Patent No. 5554574

  However, in the cap described in Patent Document 1, a fitting having an inner diameter smaller than the outer diameter of the annular protrusion and extending in the vertical direction by 0.3 to 0.7 mm above the hook on the inner peripheral surface of the tamper evidence band. Since the lower part is provided, when opening the cap attached to the container mouth, the cap body is prevented from rattling, and the bridge body does not break and the cap body comes off from the container mouth. Porosity can be prevented and the tamper evidence is improved, but the torque required for opening increases, which may make opening difficult.

  The present invention has been made in consideration of the above-mentioned matters, and an object of the present invention is to provide a synthetic resin cap capable of suppressing tapping of the opening torque while improving tamper evidence.

In order to achieve the above object, a synthetic resin cap according to the present invention comprises a skirt wall provided with a female screw that engages with a male screw formed on the outer periphery of a container mouth portion, and an annular weakening portion at a lower portion of the skirt wall. A tamper-evidence band connected via a hook, which is provided on the inner peripheral side of the tamper-evidence band with a hook that can be locked from below on an annular protrusion provided on the outer periphery of the container mouth. plural spaced in direction, the inner peripheral side of the tamper evidence band, said above the hook protrusion contiguous with projecting inside of the tamper evidence band, said the bottom of the projecting portion A contact portion that contacts the outer peripheral surface of the annular protrusion is provided, and the corresponding contact portion occupies one-third to two-thirds of the vertical width of the entire protrusion including the corresponding contact portion, Sudden From the inner circumferential surface of the part on the upper surface of the hook, extends inside diameter is reduced 20 degrees or more gradients, furthermore, above the contact portion of the inner peripheral surface of the projection, the annular projection The part extended toward upper direction is continued, maintaining the fixed internal diameter larger than the outer diameter of (Claim 1).

  The synthetic resin cap has, on the inner peripheral side of the tamper evidence band, a protrusion protruding above the protrusion and inside the tamper evidence band from the protrusion and contacting the outer peripheral surface of the container mouth. You may have (Claim 2).

  According to the present invention, it is possible to obtain a synthetic resin cap that can suppress the increase in the opening torque while improving the tamper evidence.

  That is, in the synthetic resin cap of the invention according to each claim of the present application, when the cap attached to the container mouth portion is opened, the abutting portion is brought into contact with the outer peripheral surface of the annular protrusion of the container mouth portion. This prevents the cap from being lifted diagonally, and the annular weakened portion is not uniformly biased but breaks substantially uniformly, so that the tamper evidence is improved.

  Further, a gradient of 20 degrees or more is provided on the inner peripheral surface of the abutting portion, and this gradient exerts a function of adjusting the degree of abutment of the abutting portion with respect to the annular protrusion, and the protruding portion and the annular protrusion in the closed state Even if the gap is relatively large or small, it is easy to configure the abutting portion to satisfactorily abut against the annular protrusion at the time of opening, and it is possible to prevent slipping off and an increase in opening torque. .

  In the synthetic resin cap according to the second aspect of the present invention, when the cap is opened, the projection comes into contact with the annular projection to prevent the cap from rattling or tilting, and the effect of preventing the cap from coming off is further enhanced. It will be.

It is a longitudinal section showing roughly composition of a synthetic resin cap concerning one embodiment of the present invention. (A) And (B) is explanatory drawing which shows roughly the structure of the principal part of the said synthetic resin caps of an opening process. It is explanatory drawing which shows schematically the structure of the principal part of the modification of the said synthetic resin caps.

  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 FIG. 1 is used by being attached to a mouth portion of a container (not shown) such as a PET bottle, and is integrally formed with polyethylene by compression molding or injection molding. It is molded into. 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 in plan view, and a substantially cylindrical skirt wall 3 extending downward from the outer peripheral portion of the top wall 2. Here, a knurled groove 4 is provided on the outer peripheral surface of the skirt wall 3 and a female screw 5 is provided on the inner peripheral surface. The female screw 5 is coupled to a male screw (not shown) formed on the outer periphery of the container mouth. Is possible.

  The cap 1 is a pill fur-proof cap that has a function of proving that it has not been opened (that has never been opened), and the lower part of the skirt wall 3 has an annular weakening extending over the entire circumference of the skirt wall 3. A tamper evidence band (hereinafter, simply referred to as “band”) 7 is connected via a portion 6.

  In other words, the annular weakening 6 defines the skirt wall 3 and the band 7 up and down, and includes a slit (perforated) that extends intermittently in the circumferential direction of the skirt wall 3 and the band 7 and an adjacent slit. And the bridge breaks when pulled with a predetermined force.

  A plurality of hooks 8 (for example, five) are provided on the inner circumferential side of the band 7 so as to project inwardly and increase in the amount of inward projection toward the upper side at intervals in the circumferential direction. It is. Each hook 8 has an annular protrusion (bead portion) 9 (see FIGS. 2A and 2B) formed below the male screw on the outer periphery of the container mouth portion with the cap 1 mounted on the container mouth portion. ) And is locked to the annular protrusion 9 by an opening operation. That is, the hook 8 is configured to be able to be locked to the annular protrusion 9 from below.

  As shown in FIG. 2A, on the inner peripheral side of the band 7, a protrusion 10 that protrudes inside the band 7 is connected to the upper side of the hook 8, and the outer periphery of the annular protrusion 9 is below the protrusion 10. A contact portion 11 that contacts the surface is provided. Note that the vertical width L11 of the abutting portion 11 is preferably set to be one third to two thirds of the vertical width L10 of the entire protruding portion 10 including the abutting portion 11, and in this example, approximately half (L10 Is 1.17 mm and L11 is 0.58 mm).

  Further, the abutting portion 11 extends from the inner peripheral surface of the protruding portion 10 toward the upper surface of the hook 8 so that the inner diameter decreases with a gradient θ of 20 degrees or more (preferably 20 degrees to 30 degrees). If the gradient θ is less than 20 degrees, the function of adjusting the contact degree of the contact portion 11 with respect to the annular protrusion 9 of the contact portion 11 is lowered, and the gap between the protrusion 10 and the annular protrusion 9 in the closed state is relatively small. If it is large, the abutting portion 11 does not abut against the annular projection 9 at the time of opening, and there is a risk that the cap 1 tilts and slips out. When the gap with the annular protrusion 9 is relatively small, the contact portion 11 strongly contacts the annular protrusion 9 and the torque necessary for opening the cap 1 may be excessive.

  When the cap 1 having the above-described configuration is attached to the container mouth and is unopened, the annular protrusion 9 is located inside or above the protrusion 10 (the position shown in FIG. 2A or above). When the cap 1 is rotated in the opening direction from this state, the cap 1 rises relatively with respect to the container mouth, and the contact portion 11 eventually becomes an annular protrusion as shown in FIG. 9 is brought into contact with the annular protrusion 9 from below. When the cap 1 attached to the container mouth is further opened by further rotating the cap 1 in the opening direction, the abutment provided on each hook 8 with respect to the outer peripheral surface of the annular projection 9 of the container mouth 10 abuts, thereby preventing the cap 1 from being lifted diagonally, and the annular weakening portion 6 is broken substantially uniformly without being biased, so that the tamper evidence property is improved. In FIG. 2B, the hook 8 locked to the annular protrusion 9 is drawn so as to overlap the annular protrusion 9, but in reality, both of them do not overlap in this way, and the cap 1 is mainly used. Although the side is urged by the container mouth and elastically deforms outward, the illustration after the elastic deformation is omitted.

  Further, as described above, a gradient θ of 20 degrees or more is provided on the inner peripheral surface of the contact portion 11, and this gradient exhibits a function of adjusting the contact degree of the contact portion 11 with respect to the annular protrusion 9, Even when the gap between the protruding portion 10 and the annular protrusion 9 in the closed state is relatively large or small, it is easy to configure the contact portion 11 to be in good contact with the annular protrusion 9 at the time of opening. It is possible to prevent disconnection and increase in the opening torque.

  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 protrusions 10 and the contact portions 11 are provided corresponding to the respective hooks 8. However, the present invention is not limited to this. For example, at least one of the protrusions 10 and the contact portions 11 is connected to the periphery of the band 7. One round may be provided continuously in the direction.

  The gradient θ of each contact portion 11 may be uniform or may vary, for example, three contact portions 11 having a gradient θ of 20 degrees and a gradient θ of 30 degrees. It is also possible to provide two contact portions 11.

  As shown in FIG. 3, on the inner peripheral side of the band 7, it protrudes below the annular weakened portion 6 above the protruding portion 10 and inside the band 7 than the protruding portion 10, and the cap 1 is attached to the container mouth portion. In this state, a protrusion 12 that contacts the outer peripheral surface of the container mouth (annular protrusion 9) may be provided. The projections 12 may be provided over the entire circumference in the circumferential direction of the band 7, or a plurality of projections 12 may be provided at intervals in the circumferential direction of the band 7. In the latter case, for example, each hook 8 is associated with the hook 8. It is conceivable that one or a plurality of them are provided immediately above. And by providing such a protrusion 12, the protrusion 12 abuts on the annular protrusion 9 at the time of opening to prevent the cap 1 from rattling or tilting, and preventing the cap 1 from slipping off. This will increase the effect.

  Needless to say, the above modifications may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 Cap 2 Top wall 3 Skirt wall 4 Knurled groove 5 Female screw 6 Annular weakening part 7 Band 8 Hook 9 Annular protrusion 10 Protrusion part 11 Contact part 12 Protrusion θ Gradient

Claims (2)

A cap provided with a skirt wall provided with an internal thread that engages with an external thread formed on the outer periphery of the container mouth portion, and a tamper evidence band connected to the lower portion of the skirt wall via an annular weakening portion,
On the inner peripheral side of the tamper evidence band, a plurality of hooks that can be locked from below on annular protrusions provided on the outer periphery of the container mouth portion are provided at intervals in the circumferential direction,
In addition, on the inner peripheral side of the tamper evidence band, a protrusion projecting inward of the tamper evidence band is continuous above the hook, and a lower portion of the protrusion is in contact with the outer peripheral surface of the annular protrusion. The corresponding contact portion occupies one third to two thirds of the vertical width of the entire protrusion including the corresponding contact portion, and the hook portion extends from the inner peripheral surface of the protrusion. To the upper surface, the inner diameter becomes smaller with a gradient of 20 degrees or more ,
Furthermore, a portion extending upward while maintaining a constant inner diameter that is larger than the outer diameter of the annular protrusion is continuous above the contact portion on the inner peripheral surface of the protrusion. Synthetic resin cap. 2. A protrusion is provided on the inner peripheral side of the tamper evidence band, above the protruding portion, so as to protrude from the protruding portion to the inside of the tamper evidence band and to contact the outer peripheral surface of the container mouth portion. The synthetic resin cap described in 1.

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