JP2009226831A - Preform and container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preform which is prevented from falling while being conveyed in a production process and makes it difficult for a ring to fall from a spout. <P>SOLUTION: The preform 10 has the spout 11, a reform body 12, and a flange part 13 formed between the spout 11 and the preform body 12. A male screw part 14 to be engaged with a female screw part 25 in the inner surface of a cap 20 is formed on the periphery of the spout 11. At positions between the male screw part 14 and the flange part 13 on the periphery of the spout 11, a plurality of ratchet claws 15 which are engaged in the circumference direction with the projection 28 on the inner surface of the ring 22 of a cap 20 and break off the ring 22 from a cap body 21 are installed in the circumference direction at prescribed intervals. Between the ratchet claw 15 and the flange part 13 on the periphery of the spout 11, a circumference groove part 17 retreating inward from a domain between the ratchet claws 15 are installed over the whole circumference of the spout 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body, and a container made from such a preform, and more particularly a cap. The present invention relates to a preform and a container that can break a cap body and a ring at a small rotation angle when opening the cap.

  Conventionally, a plastic bottle container made of PET or the like has been manufactured by biaxial stretch blow molding of a preform (preliminary molded body) produced by injection molding. Conventionally, such a preform as shown in FIG. 17 is used as such a preform (conventional example 1). In FIG. 17, the preform 100 includes a mouth portion 101, a preform body 102, and a flange portion 103. In FIG. 17, an annular protrusion (cabler part) 104 is formed over the entire circumference of the mouth part 101 above the flange part 103.

  In the preform 100 (conventional example 1) shown in FIG. 17, the annular protrusion 104 is provided on the entire circumference of the mouth portion 101, so that the cap ring does not fall off the mouth portion 101 after the cap is opened. However, when opening the cap, it is necessary to rotate the cap by a large angle in order to break the cap body and the ring of the cap.

  On the other hand, the preform 110 (conventional example 2) shown in FIGS. 18 and 19 is provided with four ratchet claws 114 along the outer periphery of the mouth 111 above the flange 113. With such a structure, the cap main body and the ring can be broken at a small rotation angle by engaging the protrusion on the inner surface of the ring of the cap with the ratchet pawl 114 when opening the cap.

However, as shown in FIG. 19, the circumferential length L _X of each ratchet claw 114 of the preform 110 is shorter than the interval L _Y between the ratchet claws 114. For this reason, there exists a problem that a container falls easily from the neck gripper inserted between the flange part 113 and the ratchet nail | claw 114 during conveyance in a manufacturing process. There is also a problem that after the cap is opened, the ring of the cap easily gets over the ratchet pawl 114 and falls off from the mouth portion 111.
JP 2006-263948 A

  The present invention has been made in consideration of such points, and when opening the cap, the cap body and the ring can be broken at a small rotation angle, so that they do not fall during transportation in the manufacturing process. An object of the present invention is to provide a preform and a container in which the ring does not easily fall off from the mouth after opening.

  The present invention relates to a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body. A ratchet claw that circumferentially engages a protrusion on the inner surface of the ring of the cap and ruptures the ring from the cap body at a position between the male thread and the flange on the outer periphery of the mouth. A plurality of grooves are provided at predetermined intervals in the direction, and a circumferential groove portion is provided between the ratchet claw and the flange portion on the outer periphery of the mouth portion so as to be drawn inward from the region between the ratchet claws over the entire circumference of the mouth portion. Is a preform.

  The present invention is the preform characterized in that each ratchet claw is disposed on a circumferential protrusion protruding outward from the outer peripheral wall surface of the mouth.

  The present invention is the preform characterized in that the circumferential protrusion has an inclined portion whose outer diameter gradually increases from the male screw portion side toward the flange portion side.

  The present invention is the preform characterized in that the lower surface of each ratchet claw and the groove upper surface of the circumferential groove portion are located on the same plane.

  The present invention is the preform characterized in that the lower surface of each ratchet claw is separated from the groove upper surface of the circumferential groove portion.

  The present invention relates to a container having a mouth portion, a container body, and a flange portion formed between the mouth portion and the container body, and a male thread portion that engages with a female thread portion on the inner surface of the cap is formed on the outer periphery of the mouth portion. A ratchet claw that engages with a protrusion on the inner surface of the ring of the cap in the circumferential direction at a position between the male threaded portion and the flange portion on the outer periphery of the mouth is predetermined in the circumferential direction. A container which is provided with a plurality of intervals, and a circumferential groove portion is provided between the ratchet claw and the flange portion on the outer periphery of the mouth portion so as to be drawn inward from the region between the ratchet claws over the entire circumference of the mouth portion. It is.

  As described above, according to the present invention, the circumferential groove portion that is drawn inward from the region between the ratchet claws over the entire circumference of the mouth portion is provided between the ratchet claw and the flange portion of the outer circumference of the mouth portion. When opening the cap, the cap body and the ring can be broken at a small rotation angle. Further, the preform does not fall during conveyance in the manufacturing process, and after opening, the broken ring does not fall over the ratchet claw and fall off from the mouth.

  Further, according to the present invention, each ratchet claw is disposed on a circumferential protrusion that protrudes outward from the outer peripheral wall surface of the mouth, and the circumferential protrusion gradually increases from the male thread portion side toward the flange portion side. Have an inclined portion whose outer diameter is enlarged. As a result, the protrusion easily climbs over the circumferential protrusion when closing, so that the ring can be easily accommodated in the circumferential groove, and the ring once accommodated in the circumferential groove is I will not deviate from.

  Further, according to the present invention, since the lower surface of each ratchet claw is separated from the groove upper surface of the circumferential groove portion, the ring accommodated in the circumferential groove portion is prevented from moving in the vertical direction after opening. Can do.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a preform according to this embodiment, and FIG. 2 is a top view showing the preform according to this embodiment (viewed in the direction of arrow II in FIG. 1). FIG. 3 is a vertical sectional view (sectional view taken along line III-III in FIG. 2) showing the preform according to the present embodiment, and FIG. 4 is a horizontal sectional view (shown in FIG. 1) showing the preform according to the present embodiment. IV-IV line sectional view). FIG. 5 is an enlarged view of a portion V in FIG. 1, and FIG. 6 is a vertical sectional view of the cap. FIG. 7 is a vertical sectional view showing a container and a combination according to the present embodiment, and FIG. 8 is a view showing a preform, a container, and a method for manufacturing the combination. FIG. 9 is a view showing a neck gripper for conveying a container, and FIG. 10 is a partially enlarged sectional view showing the container and the cap before the cap body and the ring are broken. FIG. 11 is a partially enlarged cross-sectional view showing the container and the cap after the cap body and the ring are broken.

Preform Configuration First, an outline of a preform according to the present embodiment will be described with reference to FIGS.

  The preform 10 shown in FIGS. 1 to 3 is manufactured by injection molding of plastic pellets made of, for example, PET (polyethylene terephthalate). This preform 10 is formed between a mouth portion 11 having a circular opening 11a formed at the upper end, a bottomed cylindrical preform body 12, and between the mouth portion 11 and the preform body 12, and outwardly. And a flange portion 13 that protrudes from the bottom.

  Among these, the external thread part 14 engaged with the internal thread part 25 of the cap 20 inner surface mentioned later is formed in the outer periphery of the opening | mouth part 11. As shown in FIG.

  In addition, a plurality of ratchet claws 15 having an engagement surface 15s at one end are arranged at predetermined intervals in the circumferential direction between the male screw portion 14 and the flange portion 13 on the outer periphery of the mouth portion 11 (four locations in the present embodiment). ) (See FIG. 4). As will be described later, the ratchet pawl 15 is engaged with a protrusion 28 on the inner surface of the ring 22 of the cap 20 in the circumferential direction to break the ring 22 from the cap body 21.

  Each ratchet claw 15 protrudes outward from the outer peripheral wall surface 11 b of the mouth portion 11 and is disposed on a circumferential protrusion 16 provided over the entire circumference of the mouth portion 11. As shown in FIG. 5, the circumferential protrusion 16 has an inclined portion 16 a whose outer diameter gradually increases from the male screw portion 14 side toward the flange portion 13 side.

  Further, as shown in FIGS. 1 and 3, the region between the ratchet claws 15 and the ratchet claws 15 and the flange portion 13 on the outer circumference of the mouth portion 11 (circumferential protrusion in the present embodiment). A circumferential groove 17 is provided which is drawn inwardly from the part 16).

  As shown in FIG. 5, the circumferential groove portion 17 includes a groove upper surface 17a, a groove lower surface 17c continuous with the upper surface 13a of the flange portion 13, and a groove bottom surface 17b located between the groove upper surface 17a and the groove lower surface 17c. Have. Further, the lower surface 15k of each ratchet pawl 15 and the groove upper surface 17a of the circumferential groove portion 17 are located on the same plane.

In FIG. 5, the width d ₁ of the circumferential groove portion 17, that is, the distance d ₁ between the lower surface 15k of each ratchet pawl 15 and the flange portion 13 is preferably 2 mm ≦ d ₁ ≦ 5 mm. Further, the depth d ₂ of the circumferential groove 17, that is, the distance d ₂ between the tip 16 b of the circumferential protrusion 16 and the groove bottom surface 17 b of the circumferential groove 17 is 0.25 mm ≦ d ₂ ≦ 1.5 mm. It is preferable to become.

Configuration of Cap Next, the configuration of the cap will be described with reference to FIG.

  The cap 20 includes a cap main body 21 and a ring 22 attached to the cap main body 21 so as to be capable of being broken. The cap body 21 and the ring 22 are integrally formed of a synthetic resin such as PE. Between the cap main body 21 and the ring 22, an annular fracture portion 20a that is thinner than the periphery is formed, and the cap main body 21 and the ring 22 can be fractured along the fracture portion 20a.

  The cap main body 21 has a flat plate-shaped top surface portion 23, a cylindrical portion 24 extending from the top surface portion 23, and a female screw portion 25 formed on the inner surface of the cylindrical portion 24. A circular protrusion 26 is provided on the inner surface of the top surface portion 23 of the cap body 21. The circular protrusion 26 engages with the inner surface of the mouth portion 11 of the preform 10 (or container 30) when the cap 20 is attached to the preform 10 (or container 30 described later).

  On the other hand, the ring 22 has a ring body 27 that is continuous with the cylindrical portion 24 of the cap body 21, and a protrusion 28 that is provided on the inner surface of the ring body 27 and extends obliquely inward from the lower end of the ring body 27. Among these, the protrusions 28 are engaged with the engagement surface 15s of the ratchet pawl 15 as described above, and a plurality of protrusions 28 (in the present embodiment, corresponding to the ratchet pawl 15 at predetermined intervals in the circumferential direction). Are provided in four places.

Construction of the container and the combined product Next, the configuration of the container and the combined product of the present embodiment by FIG.

  In FIG. 7, the container 30 is different from the preform body 12 described above in the shape of the container body 31, and the other configuration is the same as the preform 10 described above. The combined body 40 is a combination of the container 30 and the cap 20 shown in FIG. 7, the same parts as those in FIGS. 1 to 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The container 30 shown in FIG. 7 is produced by biaxially stretching blow-molding the preform 10 shown in FIGS. The container 30 includes a mouth portion 11 to which the cap 20 is attached, a container body 31 formed by stretching the preform body 12, and a flange portion 13 formed between the mouth portion 11 and the container body 31. And have.

  The shape of the container body 31 may be any shape as long as the preform body 12 is formed by biaxial stretch blow molding, and is not limited to the shape shown in FIG.

  The combined body 40 includes the cap 20 shown in FIG. 6 and the container 30 described above. That is, the cap 20 is attached to the container 30 by screwing the female screw portion 25 of the cap body 21 with the male screw portion 14 of the mouth portion 11. In FIG. 7, each protrusion 28 of the ring 22 is positioned on the circumferential protrusion 16 between the ratchet claws 15.

  That is, the combined body 40 includes a cap body 21 having a cap main body 21 having an internal thread portion 25, a ring 22 attached to the cap main body 21 so as to be broken, a mouth portion 11 to which the cap 20 is mounted, and a container main body 31. And the container 30 having the flange portion 13 formed between the mouth portion 11 and the container body 31, the outer periphery of the mouth portion 11 of the container 30 is engaged with the female screw portion 25 on the inner surface of the cap 20. A mating male screw portion 14 is formed, and the ring 22 is engaged with the protrusion portion 28 on the inner surface of the ring 22 of the cap 20 in the circumferential direction at a position between the male screw portion 14 and the flange portion 13 in the outer periphery of the mouth portion 11. A plurality of ratchet claws 15 for breaking the cap body 21 from the cap body 21 are provided at predetermined intervals in the circumferential direction, and between the ratchet claws 15 and the flange portion 13 on the outer periphery of the mouth portion 11. Mouth 11 pulled inwardly from the region between the ratchet pawl 15 around the entire circumference is provided with a circumferential groove 17.

Operation of the present embodiment Next, the operation of the present embodiment having such a configuration will be described.

  First, a method for manufacturing the preform 10 shown in FIGS. 1 to 3, the container 30 shown in FIG. 7, and the combined body 40 shown in FIG. 7 will be described with reference to FIGS.

  First, the preform 10 shown in FIGS. 1 to 3 is manufactured by injection-molding pellets made of, for example, PET resin using an injection molding machine (reference numeral 51 in FIG. 8).

  Next, after this preform 10 is heated, the container 30 shown in FIG. 7 is produced by biaxial stretch blow molding with a blow molding machine (reference numeral 52 in FIG. 8).

  Then, the container 30 is conveyed by the neck gripper (conveyance apparatus) 60 which has a pair of arms 61 and 62, as shown in FIG. At the time of conveyance, the pair of arms 61 and 62 of the neck gripper 60 are inserted into a circumferential groove portion 17 provided between the flange portion 13 of the container 30 and the ratchet claw 15 (circumferential protrusion 16). In this state, the neck gripper 60 holds the circumferential protrusion 16 and conveys the container 30. In this case, as described above, the circumferential groove portion 17 is provided over the entire circumference of the mouth portion 11 between the flange portion 13 and the ratchet claw 15 (circumferential protrusion 16). Accordingly, the contact area between the arms 61 and 62 and the circumferential protrusion 16 is increased, and the container 30 can be reliably conveyed by the neck gripper 60 regardless of the position of each ratchet pawl 15.

  On the other hand, in parallel with manufacturing the container 30, the cap 20 having the cap body 21 and the ring 22 is separately manufactured by injection molding (reference numeral 53 in FIG. 8).

  Thereafter, the cap 20 is pushed into the container 30 while being rotated clockwise as viewed from above the container 30 to attach the cap 20 to the container 30, thereby producing an assembly 40 (reference numeral 54 in FIG. 8). At this time, the female threaded portion 25 of the cap body 21 is screwed into the male threaded portion 14 of the container 30, and the protrusions 28 on the inner surface of the ring 22 are disposed on the circumferential protrusions 16 between the ratchet claws 15 ( FIG. 10).

  Next, the effect | action at the time of opening the cap 20 from the container 30 is demonstrated using FIG. 10 and FIG.

  First, in the state shown in FIG. 10, the cap 20 is rotated counterclockwise with respect to the container 30 when viewed from above the container. At this time, the cap main body 21 rotates so that the female screw portion 25 follows the male screw portion 14 of the container 30. On the other hand, the ring 22 stops when each projection 28 engages the engagement surface 15s of each ratchet pawl 15 in the circumferential direction. When the cap 20 is further rotated, the cap body 21 and the ring 22 are broken at the breaking portion 20a (FIG. 11). Thereafter, the cap body 21 is removed from the container 30.

  After the cap 20 is thus opened, the ring 22 remains in the circumferential groove portion 17 provided between the flange portion 13 of the container 30 and the ratchet pawl 15. In this case, the ring 22 does not fall over the ratchet claw 15 over the ratchet pawl 15 by the circumferential protrusion 16 provided over the entire circumference of the mouth 11.

  As described above, according to the present embodiment, the inner periphery of the mouth portion 11 is between the ratchet pawl 15 and the flange portion 13, and is within the region between the ratchet claws 15 (circumferential protrusion 16) over the entire circumference of the mouth portion 11. A circumferential groove portion 17 is provided to be pulled in the direction. Thereby, when the cap 20 is opened, the cap body 21 and the ring 22 can be broken at a small rotation angle, and the container 30 is not dropped from the neck gripper 60 during conveyance in the manufacturing process. Further, after the cap 20 is opened, the ring 22 does not get over the ratchet pawl 15 and drop off from the mouth 11 of the container 30.

  Further, according to the present embodiment, each ratchet claw 15 is disposed on the circumferential protrusion 16 protruding outward from the outer peripheral wall surface 11b of the mouth portion 11, and the circumferential protrusion 16 is on the male screw portion 14 side. The inclined portion 16a whose outer diameter gradually increases toward the flange portion 13 side. Thereby, when the plug is closed, the protrusion 28 easily gets over the circumferential protrusion 16, so that the ring 22 can be easily accommodated in the circumferential groove 17 and once accommodated in the circumferential groove 17. The ring 22 does not come off the circumferential groove 17.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 12 is a front view showing the preform according to the present embodiment, and FIG. 13 is a vertical sectional view (sectional view taken along line XIII-XIII in FIG. 12) showing the preform according to the present embodiment. . FIG. 14 is an enlarged view of the XIV portion of FIG. 12, and FIG. 15 is a vertical sectional view showing the container and the assembly according to the present embodiment. FIG. 16 is a partially enlarged cross-sectional view showing the container and the cap after the cap body and the ring are broken. The second embodiment shown in FIGS. 12 to 16 is different in that the lower surface of each ratchet claw is separated from the groove upper surface of the circumferential groove portion, and the other configuration is the same as that of the first embodiment described above. It is almost the same as the form. 12 to 16, the same parts as those of the first embodiment shown in FIGS. 1 to 11 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 12 to 14, the lower surface 15 k of each ratchet pawl 15 is separated from the groove upper surface 17 a of the circumferential groove portion 17. That is, the lower surface 15 k of each ratchet pawl 15 is located above the groove upper surface 17 a of the circumferential groove portion 17.

As shown in FIG. 14, the circumferential protrusion 16 includes an inclined portion 16a whose outer diameter gradually increases from the male screw portion 14 side toward the flange portion 13 side, and a vertical portion 16c extending downward from the inclined portion 16a. And have. Of these, the width d ₃ in the height direction of the vertical portion 16c, that is, the distance d ₃ between the lower surface 15k of each ratchet pawl 15 and the tip portion 16b of the circumferential protrusion 16 is 0.1 mm ≦ d ₃ ≦ 2 mm. Is preferred.

In FIG. 14, the width d ₄ of the circumferential groove portion 17, that is, the distance d ₄ between the lower surface 15 k of each ratchet pawl 15 and the upper surface 13 a of the flange portion 13 is preferably 2 mm ≦ d ₄ ≦ 5 mm. The depth d ₅ of the circumferential groove 17, that is, the distance d ₅ between the tip 16 b of the circumferential protrusion 16 and the groove bottom surface 17 b of the circumferential groove 17 is 0.25 mm ≦ d ₅ ≦ 1.5 mm. It is preferable to become.

  Next, the configuration of the container and the assembly according to the present embodiment will be described with reference to FIG.

  In FIG. 15, the container 30 is manufactured by biaxially stretch-blowing the preform 10 shown in FIGS. 12 to 14. The container 30 includes a mouth portion 11 to which the cap 20 is attached, a container body 31 formed by stretching the preform body 12, and a flange portion 13 formed between the mouth portion 11 and the container body 31. And have.

  Further, as shown in FIG. 15, a combination 40 is constituted by the cap 20 shown in FIG. 6 and the container 30 described above.

  Thus, according to the present embodiment, the lower surface 15k of each ratchet pawl 15 is separated from the groove upper surface 17a of the circumferential groove portion 17, so that the ring 22 accommodated in the circumferential groove portion 17 is opened after opening. Will not fall off. That is, as shown in FIG. 16, in the state in which the ring 22 is accommodated in the circumferential groove portion 17, the protrusions 28 on the inner surface of the ring 22 abut against and engage with the groove upper surface 17 a of the circumferential groove portion 17. Can be prevented from falling off.

(Example)
Next, specific examples of the present invention will be described.

  First, the preform 10 shown in FIG. 1 and the preform 10 shown in FIG. 12 were produced by injection molding under the following conditions (30 pieces). As a comparative example, preforms 110 shown in FIG. 18 were produced under the same conditions (30 pieces).

Injection material: SHINPET 5015W
Injection molding machine: FE160 (Manufacturer: Nissei Plastic Industry)

  Next, the container 30 (Example 1) was produced by blow-molding each preform 10 shown in FIG. 1 based on the following conditions. Moreover, the container 30 (Example 2) was produced by blow-molding each preform 10 shown in FIG. 12 based on the following conditions. Further, each preform 110 (comparative example) was blow-molded in the same manner to produce a container as a comparative example.

Blow molding machine: LB-01 (SIG Corpoplast)
Container weight: about 21g

Next, the cap 20 was attached to each container (the container 30 of Example 1 and Example 2 and the container of Comparative Example, the same applies hereinafter), and then immediately opened. As a result, the ring 22 of the cap 20 was broken from the cap body 21, and the ring 22 remained in each container. Thereafter, these containers were divided into groups of 10 and left for 1 week under conditions of 3 ° C., 22 ° C., and 40 ° C., respectively. Then, the test which confirms whether the ring 22 falls from each container was done. This test method uses the opening and closing meter of “AUTOMATIC TORQUE ANALYZER KE-10” manufactured by Kyoto Giken, tightens the cap 20 to the container 30 with a force of 150 N · cm, and opens the cap using the same device. It is a thing.

  As a result, in the container as a comparative example, all the rings 22 dropped out under all temperature conditions, whereas the container 30 of Example 1 and the container 30 of Example 2 had the ring 22 under all temperature conditions. There was no dropout.

The front view which shows the preform by the 1st Embodiment of this invention. The top view which shows the preform by the 1st Embodiment of this invention (II direction arrow line view of FIG. 1). FIG. 3 is a vertical sectional view showing the preform according to the first embodiment of the present invention (a sectional view taken along line III-III in FIG. 2). FIG. 4 is a horizontal sectional view showing the preform according to the first embodiment of the present invention (a sectional view taken along line IV-IV in FIG. 1). The V section enlarged view of FIG. The vertical sectional view of a cap. 1 is a vertical sectional view showing a container and a combination according to a first embodiment of the present invention. The figure which shows the manufacturing method of a preform, a container, and an assembly. The figure which shows the neck gripper which conveys a container. The partial expanded sectional view which shows the circumference | surroundings of the opening | mouth part of the container by 1st Embodiment before a cap main body and a ring are fractured | ruptured. The partial expanded sectional view which shows the circumference | surroundings of the opening | mouth part of the container by 1st Embodiment after a cap main body and a ring are fractured | ruptured. The front view which shows the preform by the 2nd Embodiment of this invention. FIG. 13 is a vertical sectional view showing a preform according to a second embodiment of the present invention (cross-sectional view taken along line XIII-XIII in FIG. 12). The XIV part enlarged view of FIG. The vertical sectional view showing the container and combination by a 2nd embodiment of the present invention. The partial expanded sectional view which shows the container and cap in 2nd Embodiment after a cap main body and a ring are fractured | ruptured. The front view which shows the conventional preform. The front view which shows another conventional preform. The XIX-XIX sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Preform 11 Mouth part 11b Outer peripheral wall surface 12 Preform main body 13 Flange part 14 Male thread part 15 Ratchet claw 15k Lower surface 16 Circumferential protrusion part 16a Inclined part 17 Circumferential groove part 17a Groove upper surface 20 Cap 21 Cap main body 22 Ring 25 Female thread part 27 Ring body 28 Protrusion 30 Container 31 Container body 40 Combined body

Claims (6)

In a preform having a mouth portion, a preform body, and a flange portion formed between the mouth portion and the preform body,
On the outer periphery of the mouth, a male thread part that engages with the female thread part on the inner surface of the cap is formed,
A ratchet claw that engages the protrusion on the inner surface of the ring of the cap in the circumferential direction at a position between the male threaded portion and the flange portion on the outer periphery of the mouth, and causes the ring to break from the cap body at a predetermined interval in the circumferential direction. A plurality of
A preform characterized in that a circumferential groove portion is provided between the ratchet claw and the flange portion on the outer periphery of the mouth portion so as to be drawn inward from the region between the ratchet claws over the entire circumference of the mouth portion.   The preform according to claim 1, wherein each ratchet claw is disposed on a circumferential protrusion protruding outward from an outer peripheral wall surface of the mouth.   The preform according to claim 2, wherein the circumferential protrusion has an inclined portion whose outer diameter gradually increases from the male screw portion side toward the flange portion side.   The preform according to any one of claims 1 to 3, wherein a lower surface of each ratchet claw and a groove upper surface of the circumferential groove portion are located on the same plane.   The preform according to any one of claims 1 to 3, wherein a lower surface of each ratchet claw is spaced apart from a groove upper surface of the circumferential groove portion. In a container having a mouth portion, a container body, and a flange portion formed between the mouth portion and the container body,
On the outer periphery of the mouth, a male thread part that engages with the female thread part on the inner surface of the cap is formed,
A ratchet claw that engages the protrusion on the inner surface of the ring of the cap in the circumferential direction at a position between the male threaded portion and the flange portion on the outer periphery of the mouth, and causes the ring to break from the cap body at a predetermined interval in the circumferential direction. A plurality of
A container characterized in that a circumferential groove portion is provided between the ratchet claw and the flange portion on the outer periphery of the mouth portion so as to be drawn inward from an area between the ratchet claws over the entire circumference of the mouth portion.

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