JP4449487B2

JP4449487B2 - Plastic cap with anti-tampering function

Info

Publication number: JP4449487B2
Application number: JP2004042448A
Authority: JP
Inventors: 剛史齋藤
Original assignee: Toppan Inc
Current assignee: Toppan Inc
Priority date: 2004-02-19
Filing date: 2004-02-19
Publication date: 2010-04-14
Anticipated expiration: 2024-02-19
Also published as: JP2005231660A

Description

本発明は、ガラス瓶やプラスチックボトルなどの容器の注出口部を施蓋するプラスチックキャップに関し、容器内の内容物を不正開封から保護するための不正開封防止機能付きプラスチックキャップに関する。 The present invention relates to a plastic cap that covers a spout portion of a container such as a glass bottle or a plastic bottle, and relates to a plastic cap with an unauthorized opening preventing function for protecting contents in the container from unauthorized opening.

従来の不正開封防止機能付きプラスチックキャップとしては、インジェクション成形方式により、各種の形態のキャップが製造され使用されている。 As conventional plastic caps with an unauthorized opening prevention function, various types of caps are manufactured and used by an injection molding method.

例えば、図５（ａ）〜（ｃ）の側面図に示すように、天部１と、円周面に母線方向にローレット２ｂを刻設した円筒部２と、該円筒部２の筒内周に設けた螺子部（図示せず）と、該円筒部２の下端部に、必要に応じて設けたハーフカット線３を介してリング状に連接した薄板状のリングバンド部４と、該リングバンド部４の母線方向の一部に設けたリングバンド部４を容易に破断するための易破断部として切欠部６とを備え、該バンド部４のリング内周下端に沿うヒンジ線を介して、リング中心内方に向かって略水平方向から起立方向に折り曲げ可能に延設した複数枚の係止板（図示せず）を備えた各種形態の不正開封防止機能付きプラスチックキャップＣがある。 For example, as shown in the side views of FIGS. 5 (a) to 5 (c), the top portion 1, the cylindrical portion 2 in which a knurl 2 b is engraved on the circumferential surface in the generatrix direction, and the cylinder inner periphery of the cylindrical portion 2 A screw part (not shown) provided in the ring, a thin ring-shaped ring band part 4 connected to the lower end of the cylindrical part 2 via a half-cut line 3 provided as necessary, and the ring A notch portion 6 is provided as an easily breakable portion for easily breaking the ring band portion 4 provided in a part of the band portion 4 in the generatrix direction, and via a hinge line along the lower inner periphery of the ring of the band portion 4 There are various types of plastic caps C with a tamper-evident prevention function including a plurality of locking plates (not shown) that extend from the substantially horizontal direction to the standing direction toward the center inward of the ring.

ところで、上記のような不正開封防止機能付きプラスチックキャップＣは、キャップ円筒部２の螺子部をプラスチックボトルなどの容器の注出口部の外周に設けた螺子部に螺着しながら、リングバンド部４を該注出口部の外周にリング状に設けた凸部に嵌入して取り付けられるものであるが、その際に、バンド部４の下端内周に延設した複数枚の水平方向の係止板は、容器の注出口部の外周にリング状に設けた凸部を乗り越えて嵌入して起立方向に折り曲げられ、その係止板の先端部は注出口部の外周凸部の下部に係合して、キャップＣは、容器注出口部から外れないように係止閉栓されて取り付けられるようになっている。 By the way, the above-mentioned plastic cap C with an unauthorized opening preventing function is configured such that the screw part of the cap cylindrical part 2 is screwed to the screw part provided on the outer periphery of the spout part of a container such as a plastic bottle, and the ring band part 4 Are fitted in and attached to a convex portion provided in a ring shape on the outer periphery of the spout portion, and at that time, a plurality of horizontal locking plates extended to the inner periphery of the lower end of the band portion 4 Is fitted over the outer periphery of the spout portion of the container over the convex portion provided in a ring shape and bent in the standing direction, and the front end of the locking plate engages with the lower portion of the outer peripheral convex portion of the spout portion. Then, the cap C is locked and closed so as not to be detached from the container outlet portion.

そして、容器注出口部に螺着したキャップＣの円筒部２を開封方向に回転させると、円筒部２とリングバンド部４はともに、容器注出口部の上端方向に徐々に旋回移動し、容器の注出口部外周の凸部下部に係合している該バンド部の係止板には、バンド部の直径を拡張する水平姿勢方向への応力が掛かり、バンド部４の切欠部６にも拡張による張力が掛かり、やがて、バンド部４は切欠部６から破断して、不正開封が検知できるものである。 Then, when the cylindrical part 2 of the cap C screwed to the container outlet part is rotated in the opening direction, both the cylindrical part 2 and the ring band part 4 gradually pivot and move in the upper end direction of the container outlet part. The locking plate of the band part engaged with the convex lower part of the outer periphery of the spout part is subjected to stress in the horizontal posture direction that expands the diameter of the band part, and the notch part 6 of the band part 4 also The tension due to the expansion is applied, and the band part 4 is eventually broken from the notch part 6 so that the tampering can be detected.

図５（ａ）に示すキャップＣは、キャップ円筒部２の直径に比較してバンド部４の直径が大きい外形のキャップであるが、このキャップＣをインジェクション成形する場合は、バンド部４の下端部をコアー金型とキャビィティ金型との互いのパーティングライン（金型分離線）として、コアー金型（雄型）がバンド部４の下方から該バンド部４内及びキャップ円筒部２内に嵌入し、キャビティー金型（雌型）が、そのキャップ円筒部２の上方より、該キャップ円筒部２及びバンド部４の外面を被覆するように配置されて、切欠部６は、キャビティー金型内に突出して設けた凸型部により成形されるものであり、このように円筒部２よりも直径の大きいバンド部４に繋ぎ部６ａのある切欠部６を設けることは、成形後のキャビティーとコアーとの分離開放のためにキャビティー金型を上方に引き上げる際に、キャビティー金型内に突出して設けた凸型部が成形された切欠部６に引っ掛かることなく金型を容易に分離開放でき、したがって、一般的にインジェクション成形方式におけるキャップ円筒部２の直径に比較してバンド部４の直径が大きい外形のキャップＣの成形は比較的容易である。 A cap C shown in FIG. 5A is a cap having an outer shape in which the diameter of the band portion 4 is larger than the diameter of the cap cylindrical portion 2, but when the cap C is injection-molded, the lower end of the band portion 4 is used. The part is a parting line (die separation line) between the core mold and the cavity mold, and the core mold (male mold) enters the band part 4 and the cap cylindrical part 2 from below the band part 4. The cavity mold (female mold) is inserted so as to cover the outer surfaces of the cap cylinder part 2 and the band part 4 from above the cap cylinder part 2, and the notch part 6 It is formed by a projecting mold part that protrudes into the mold, and providing the notch part 6 with the connecting part 6a in the band part 4 having a diameter larger than that of the cylindrical part 2 in this way is a mold after molding. Tea and core When the cavity mold is lifted upward for separation and release, the mold can be easily separated and opened without being caught by the notched portion 6 formed by protruding the protruding mold portion in the cavity mold. In general, it is relatively easy to form a cap C having an outer shape in which the diameter of the band portion 4 is larger than the diameter of the cap cylindrical portion 2 in the injection molding method.

また、図５（ｂ）、（ｃ）に示すキャップＣのように、キャップ円筒部２とリングバンド部４のそれぞれ直径が同じ大きさのキャップの場合には、図５（ｂ）に示すように、リング状のバンド部４の母線方向の一部に縦方向のいずれにも繋ぎ部６ａのないハーフカット形式による切欠部６を設けたり、図５（ｃ）に示すように、バンド部４の上部に繋ぎ部６ａのある切欠部６を設けたりしていたが、キャップ円筒部２とバンド部４のそれぞれ直径が同じ外形のキャップであるために、成形後のキャビティーとコアーとの分離開放のためにキャビティー金型を上方に引き上げる際に、キャビティー金型内に突出して設けた切欠部６を成形するための凸型部が、成形後の切欠部６に引っ掛かり、金型を容易に分離開放できず、インジェクション成形方式におけるキャップ円筒部２とバンド部４のそれぞれ直径が同じ外形のキャップＣの成形は困難である。 Further, in the case of a cap having the same diameter in the cap cylindrical portion 2 and the ring band portion 4 as in the cap C shown in FIGS. 5B and 5C, as shown in FIG. 5B. In addition, a notch portion 6 of a half cut type without a connecting portion 6a in any of the longitudinal directions is provided in a part of the generatrix direction of the ring-shaped band portion 4, or as shown in FIG. 5 (c), the band portion 4 The cut portion 6 having the connecting portion 6a is provided on the upper portion of the cap, but since the cap cylindrical portion 2 and the band portion 4 are caps having the same outer diameter, the cavity and the core are separated from each other after molding. When the cavity mold is pulled upward for opening, a convex mold part for molding the notch part 6 projecting into the cavity mold is caught by the notch part 6 after molding, It cannot be easily separated and opened, and injection Forming respective diameter of the cap cylindrical portion 2 and the band part 4 of the cap C of the same outer in scheme is difficult.

また、図５（ｂ）に示す縦方向のいずれにも繋ぎ部のないハーフカット形式による切欠部６を設けた形態のキャップＣの場合、切欠部６のハーフカットの厚さが薄いと、そのハーフカット部分のプラスチックが伸びて不正開封防止性能が低下したり、厚いとキャップ円筒部２を回転して開封する際に、切欠部６のハーフカットが切れ難くなるなどの問題があり、成形金型の作成や成形制御上の困難性があった。 Further, in the case of the cap C in the form of providing the notch portion 6 in the half-cut format with no connecting portion in any of the longitudinal directions shown in FIG. 5B, if the thickness of the notch portion 6 is thin, If the plastic of the half-cut portion is stretched and the performance of preventing unauthorized opening is lowered, or if it is thick, there is a problem that the half-cut of the cut-out portion 6 is difficult to cut when the cap cylindrical portion 2 is rotated and opened. There were difficulties in mold creation and molding control.

また、図５（ｃ）に示すバンド部４の上部に繋ぎ部６ａのある切欠部６を設けた形態のキャップの場合、切欠部６がバンド部４の下端側にあるため、バンド部４が開放し易く、容器注出口部外周面とバンド部４の内面との高い密着性が得られず、不正開封防止性能が著しく低下する問題があった。 Further, in the case of the cap in the form in which the notch portion 6 having the connecting portion 6a is provided on the upper portion of the band portion 4 shown in FIG. 5C, the notch portion 6 is on the lower end side of the band portion 4, and therefore the band portion 4 is It is easy to open, high adhesion between the outer peripheral surface of the container spout part and the inner surface of the band part 4 cannot be obtained, and there has been a problem that the unauthorized opening prevention performance is remarkably lowered.

以下に、公知の特許文献を記載する。
実公昭４６−２４１４９号公報実公昭４６−２４１５１号公報ＵＳＰ．４５５０８４４号公報特開平８−４８３５０号公報特開平８−９１４０１号公報特開平１０−２１８２１１号公報 The known patent documents are described below.
Japanese Utility Model Publication No. 46-24149 Japanese Utility Model Publication No. 46-24151 USP. No. 4550844 JP-A-8-48350 JP-A-8-91401 JP-A-10-218211

本発明は、キャップ円筒部とリングバンド部のそれぞれ直径が同じ大きさのキャップであって、リングバンド部に該バンド部を容易に破断可能な易破断部を設けた不正開封防止機能付きキャップにおいて、成形後のキャビティーとコアーとの分離開放のためにキャビティー金型を上方に引き上げる際に、キャビティー金型内に設けた易破断部を成形するための成形型部が成形後の易破断部に引っ掛かることなく、キャビティーとコアーとによる金型を容易に分離開放できて、成形品を取り出し易く、インジェクション成形による成形を容易に行うことができるようにするとともに、易破断部のハーフカットの厚さを容易に破断し易く、且つ容器注出口部の外周面とリングバンド部内面との高い密着性が得られる適正な薄さに容易に制御できる不正開封防止機能付きキャップを提供することにある。 The present invention relates to a cap with a tamper-evident prevention function, in which a cap cylindrical part and a ring band part have the same diameter, and the ring band part is provided with an easily breakable part capable of easily breaking the band part. When the cavity mold is lifted upward to separate the cavity and core after molding, the mold part for molding the easily breakable part provided in the cavity mold is easy after molding. The mold by the cavity and the core can be easily separated and opened without being caught by the fractured part, the molded product can be easily taken out, the molding by injection molding can be easily performed, and the half of the easily fractured part The thickness of the cut can be easily broken, and can be easily controlled to an appropriate thickness that provides high adhesion between the outer peripheral surface of the container outlet and the inner surface of the ring band. It is to provide a positive opening prevention function with a cap.

本発明の請求項１に係る発明は、天部１と、円筒部２と、該円筒部２の筒内周に設けた螺子部２ａと、該円筒部２の下端部にリング状に連接した前記円筒部２と同じ直径を有する薄板状のリングバンド部４と、該リングバンド部４のリング内周下端にヒンジ５ａを介して該リングバンド部４のリング内方中心に向かって略水平方向に延設した複数枚の係止板５とを備えたプラスチックキャップにおいて、前記薄板状のリングバンド部４の一部に、該リングバンド部４外周面を作る１本の母線方向に伸び、外側方向に向かって突出する突出部７が設けられ、該突出部７にはその母線方向に該リングバンド部４を易破断可能なハーフカット部７ａが設けられていることを特徴とする不正開封防止機能付きプラスチックキャップである。 The invention according to claim 1 of the present invention is connected to the top portion 1, the cylindrical portion 2, the screw portion 2 a provided on the inner periphery of the cylindrical portion 2, and the lower end portion of the cylindrical portion 2 in a ring shape. A thin ring-shaped ring band portion 4 having the same diameter as the cylindrical portion 2, and a substantially horizontal direction toward the ring inner center of the ring band portion 4 via a hinge 5a at the ring inner peripheral lower end of the ring band portion 4 In the plastic cap provided with a plurality of locking plates 5 extending to the outer periphery, a part of the thin ring-shaped ring band portion 4 extends in the direction of one bus line that forms the outer peripheral surface of the ring band portion 4 and is outside. Protrusions 7 projecting in the direction are provided, and the projecting parts 7 are provided with half-cut parts 7a capable of easily breaking the ring band part 4 in the generatrix direction. A functional plastic cap.

本発明の請求項２に係る発明は、上記請求項１に係る不正開封防止機能付きプラスチックキャップにおいて、前記円筒部２と薄板状のリングバンド部４との連接部分に沿って易破断可能なハーフカット部若しくは部分繋ぎ部３が設けられていることを特徴とする不正開封防止機能付きプラスチックキャップである。 According to a second aspect of the present invention, in the plastic cap with an unauthorized opening preventing function according to the first aspect, a half that can be easily broken along a connecting portion between the cylindrical portion 2 and the thin ring-shaped ring band portion 4. It is a plastic cap with a tamper-evident-preventing function, characterized in that a cut portion or a partial connecting portion 3 is provided.

本発明の不正開封防止機能付きプラスチックキャップは、図１、図２、図３に示すように、天部１と、円筒部２と、該円筒部２の筒内周に設けた螺子部２ａと、該円筒部２の下端部にハーフカット線３を介してリング状に連接した前記円筒部２と同じ直径を有する薄板状リングバンド部４と、該リングバンド部４のリング内周下端のヒンジ線５ａを介して該リングバンド部４のリング内方中心に向かって略水平方向に延設した複数枚の係止板５とを備えたプラスチックキャップである。 As shown in FIGS. 1, 2, and 3, the plastic cap with an unauthorized opening preventing function of the present invention includes a top portion 1, a cylindrical portion 2, and a screw portion 2a provided on the inner periphery of the cylindrical portion 2. A thin plate-shaped ring band portion 4 having the same diameter as that of the cylindrical portion 2 connected in a ring shape to the lower end portion of the cylindrical portion 2 via a half-cut line 3, and a hinge at the lower end of the ring inner periphery of the ring band portion 4 It is a plastic cap provided with a plurality of locking plates 5 extending in a substantially horizontal direction toward the inner center of the ring of the ring band portion 4 via a line 5a.

そのために、上記不正開封防止機能付きプラスチックキャップＣの螺子部２ａを、図４に示すような、筒状側壁部１１と、その下部に底部１２と、筒状側壁部１１の上部に注出口部１３とを備えた容器Ｄの前記注出口部１３の外周に設けた螺子部１３ａに螺着しながら、キャップＣのリングバンド部４を、該注出口部１３の外周にリング状に設けた凸部１４に嵌入し、該バンド部４の下端内周に延設した水平方向の複数枚の係止板５を、容器Ｄの注出口部１３の前記凸部１４を乗り越えて嵌入し、係止板５の先端部５ｂをヒンジ栓５ａにて起立方向に折り曲げて、その係止板５の先端部５ｂを注出口部１４外周の前記凸部１４の下部に係合することにより、キャップＣは、容器Ｄの注出口部１３から外れないように係止閉栓されて取り付けることができる。 For this purpose, the screw part 2a of the plastic cap C with the unauthorized opening preventing function is provided with a cylindrical side wall part 11, a bottom part 12 at the lower part, and a spout part at the upper part of the cylindrical side wall part 11 as shown in FIG. The ring band portion 4 of the cap C is provided on the outer periphery of the spout portion 13 in a ring shape while being screwed onto the screw portion 13a provided on the outer periphery of the spout portion 13 of the container D. A plurality of horizontal locking plates 5 that are fitted into the portion 14 and extend to the inner periphery of the lower end of the band portion 4 are fitted over the convex portion 14 of the spout portion 13 of the container D to be locked. The cap C is formed by bending the front end 5b of the plate 5 in the standing direction with the hinge plug 5a and engaging the front end 5b of the locking plate 5 with the lower part of the convex portion 14 on the outer periphery of the spout portion 14. , Locked and closed so as not to come off from the spout 13 of the container D Door can be.

また、本発明の不正開封防止機能付きプラスチックキャップＣは、図１、図２、図３に示すように、前記リングバンド部４の一部に、該リングバンド部４外周面を作る１本の母線方向に伸び、外側方向に向かって突出する突出部７が設けられ、該突出部７には、その
母線方向に該リングバンド部４を易破断可能なハーフカット部７ａ（薄肉部）が設けられて、該リングバンド部４の易破断部が構成されている。 In addition, the plastic cap C with a tamper-evident preventing function of the present invention, as shown in FIGS. 1, 2, and 3, is a single piece that forms an outer peripheral surface of the ring band part 4 in a part of the ring band part 4. A protruding portion 7 extending in the busbar direction and protruding outward is provided, and the protruding portion 7 is provided with a half-cut portion 7a (thin wall portion) capable of easily breaking the ring band portion 4 in the busbar direction. Thus, an easily breakable portion of the ring band portion 4 is configured.

そのために、容器Ｄの注出口部１３に螺着したキャップＣの円筒部２を、開封方向に回転させると、円筒部２とリングバンド部４はともに、注出口部１３の上端方向に徐々に旋回移動して、容器Ｄの注出口部１３外周の凸部１４下部に係合しているリングバンド部４内周下端の各々係止板５の先端部５には、該凸部１４下部の当接により、該バンド部４の直径を拡張する水平姿勢方向への応力が掛かり、該バンド部４の突出部７にも拡張による張力が掛かり、やがて、バンド部４は易破断部である突出部７のハーフカット部７ａから破断して不正開封が検知できるものである。 Therefore, when the cylindrical part 2 of the cap C screwed to the spout part 13 of the container D is rotated in the opening direction, both the cylindrical part 2 and the ring band part 4 gradually move toward the upper end direction of the spout part 13. The tip end portion 5 of the locking plate 5 at the lower end of the inner periphery of the ring band portion 4 engaged with the lower portion of the convex portion 14 on the outer periphery of the spout portion 13 of the container D is pivotally moved. Due to the contact, stress in the horizontal posture direction that expands the diameter of the band portion 4 is applied, and the protruding portion 7 of the band portion 4 is also subjected to tension due to expansion, and eventually the band portion 4 protrudes as an easily breakable portion. Breaking from the half-cut part 7a of the part 7 can detect unauthorized opening.

そして、本発明の不正開封防止機能付きプラスチックキャップＣは、インジェクション成形の際には、図２の側断面図に示すように、リングバンド部４の下端部の水平方向をインジェクション成形用のコアー金型２１（雄型）とキャビィティ金型２２（雌型）との互いの接合・分離するパーティングライン２３（金型分離線）として成形され、コアー２１
がリングバンド部４の下方から、該バンド部４内及びキャップ円筒部２内に嵌入し、キャビティ２２が、そのキャップ円筒部２の上方より、該キャップ円筒部２及びバンド部４の外面を被覆するように配置されて、例えばキャビティ２２の上部にある溶融樹脂インジェクション孔部２４より溶融樹脂を注入することによりキャップＣが成形されて、該バンド部４の易破断部である突出部７及びハーフカット部７ａ（薄肉部）は、前記コアー２１の凸型部分とキャビティ２２内に設けた凹型部２２ａとにより成形されるものである。 And the plastic cap C with an unauthorized opening preventing function of the present invention is a core metal for injection molding in the horizontal direction of the lower end portion of the ring band portion 4 as shown in the side sectional view of FIG. The mold 21 (male mold) and the cavity mold 22 (female mold) are molded as parting lines 23 (mold separation lines) for joining and separating from each other, and the core 21
Is inserted into the band portion 4 and the cap cylindrical portion 2 from below the ring band portion 4, and the cavity 22 covers the outer surfaces of the cap cylindrical portion 2 and the band portion 4 from above the cap cylindrical portion 2. For example, the cap C is formed by injecting molten resin from the molten resin injection hole 24 at the top of the cavity 22, and the protruding portion 7 and the half that are the easily breakable portions of the band portion 4 are formed. The cut portion 7 a (thin wall portion) is formed by the convex portion of the core 21 and the concave portion 22 a provided in the cavity 22.

そのため、キャップ円筒部２とリングバンド部４のそれぞれ直径が同じ大きさのキャップＣであっても、成形後のキャップＣを取り出すための前記コアー２１とキャビティ２２との分離開放のためにキャビティ２２をパーティングライン２３から上方に引き上げる際に、キャビティ２２内の突出部７を成形するための型部分には凹型部２２ａがあるものの突出部（凸型部）は存在しないため、キャビティ２２は成形後の突出部７に引っ掛かることなく円滑に上方に引き上げて、コア２１とキャビティ２２とによる金型を容易に分離開放して成形品を取出し易く、インジェクション成形による成形を容易に行うことができるものである。 Therefore, even if the cap cylinder part 2 and the ring band part 4 are caps C having the same diameter, the cavity 22 is used to separate and open the core 21 and the cavity 22 for taking out the cap C after molding. When the upper part is pulled upward from the parting line 23, the mold part for forming the projecting part 7 in the cavity 22 has a concave part 22a, but there is no projecting part (convex mold part). It can be pulled up smoothly without being caught by the rear projection 7, and the mold by the core 21 and the cavity 22 can be easily separated and opened to easily take out the molded product, and molding by injection molding can be easily performed. It is.

また、本発明の不正開封防止機能付きプラスチックキャップＣは、リングバンド部４の易破断部であるハーフカット部７ａを形成した部位が、突出部７として突出した形状としたので、ハーフカット部７ａ（薄肉部）は、ハーフカットの厚さを容易に破断し易い薄さに設定でき、且つ、容器Ｄの注出口部１３外周面と、リングバンド部４内面との高い密着性が得られる適正な薄さに容易に制御することができるものである。 Moreover, since the plastic cap C with a tamper-evident preventing function of the present invention has a shape in which the half-cut portion 7a, which is an easily breakable portion of the ring band portion 4, is formed as a protruding portion 7, the half-cut portion 7a The (thin wall portion) can be set so that the thickness of the half cut can be easily broken, and is suitable for obtaining high adhesion between the outer peripheral surface of the spout portion 13 of the container D and the inner surface of the ring band portion 4. The thickness can be easily controlled.

本発明の不正開封防止機能付きプラスチックキャップについて、図１に示す本発明の一例を説明する側面図、図２に示すそのＡ−Ａ側断面図、図３に示すそのＢ−Ｂ側断面図に基づいて以下に詳細に説明する。 1 is a side view for explaining an example of the present invention shown in FIG. 1, its AA side sectional view shown in FIG. 2, and its BB side sectional view shown in FIG. This will be described in detail below.

本発明のプラスチックキャップＣは、図１、図２に示すように、天部１と、該天部１の内面に設けたインナーリング部１ａと、円周面に母線方向にローレット２ｂを刻設した円筒部２と、該円筒部２の筒内周に設けた螺子部２ａと、該円筒部２の下端部に、必要に応じて設けたハーフカット線３を介して、リング状に連接した薄板状のリングバンド部４と、該リングバンド部４の母線方向の一部に設けたリングバンド部４を容易に破断するための易破断部として突出部７とを備えている。 As shown in FIGS. 1 and 2, the plastic cap C of the present invention has a top portion 1, an inner ring portion 1a provided on the inner surface of the top portion 1, and a knurl 2b in the generatrix direction on the circumferential surface. The cylindrical portion 2, the screw portion 2 a provided on the inner periphery of the cylindrical portion 2, and the lower end portion of the cylindrical portion 2 are connected in a ring shape via a half-cut wire 3 provided as necessary. A thin ring-shaped ring band portion 4 and a protruding portion 7 as an easily breakable portion for easily breaking the ring band portion 4 provided at a part of the ring band portion 4 in the generatrix direction are provided.

前記リングバンド部４には、図２、図３に示すように、そのリング内周の下端縁に沿うヒンジ線５ａ（折り曲げ部）を介して、リング中心内方に向かって、略水平方向（又はリング内方に向かって僅かに高く傾斜する方向）から起立する方向（図２に図示する矢印方向）に折り曲げ可能に延設した複数枚の係止板５を備えている。 As shown in FIGS. 2 and 3, the ring band portion 4 has a substantially horizontal direction (in the direction toward the center of the ring) via a hinge line 5 a (bending portion) along the lower edge of the inner periphery of the ring. Alternatively, a plurality of locking plates 5 are provided so as to be foldable in a direction (an arrow direction shown in FIG. 2) that stands up from a direction slightly inclined toward the inside of the ring.

本発明のプラスチックキャップＣは、図４に示すように、キャップ円筒部２の螺子部２ａを、プラスチックボトルなどの容器Ｄの注出口部１３の外周に設けた螺子部１３ａに、螺着Ｓ1 方向に回転させて螺着しながら、該キャップＣを螺着方向の回転により容器Ｄの注出口部１３に沿って下方に移動させ、該キャップＣの移動とともに下方へ移動するリングバンド部４を、該注出口部１３の外周にリング状に設けた凸部１４に乗り越えてるようにして嵌入して取り付けられる。 In the plastic cap C of the present invention, as shown in FIG. 4, the screw portion 2a of the cap cylindrical portion 2 is screwed to the screw portion 13a provided on the outer periphery of the spout portion 13 of the container D such as a plastic bottle. The ring band part 4 that moves downward along the spout part 13 of the container D by rotating in the screwing direction while rotating and screwing to the ring band part 4 that moves downward along with the movement of the cap C, It is fitted and attached so as to get over the convex portion 14 provided in a ring shape on the outer periphery of the spout portion 13.

その際に、前記リングバンド部４内周の下端縁に沿ってヒンジ線５ａを介して延設した複数枚の水平方向の係止板５は、図４に示すように、容器Ｄの注出口部１３の外周にリング状に設けた凸部１４を乗り越えて嵌入し、そして、その際に、図４に示すように、各々係止板５は起立方向に折り曲げられ、その各々係止板５の先端部５ｂは、注出口部１３の
外周凸部１４の下部（庇部）に下側から上向きに当接して係合する。そのため、キャップＣは、容器注出口部１３から外れないように係止閉栓されて容器Ｄに取り付けられるようになっている。そしてキャップＣの天部１内面のインナーリング１ａは、容器Ｄの注出口部１３の先端開口部に密封状態に嵌合する。なお、容器注出口部１３の内部には、必要に応じてプルリングにより開封可能なプルリング付き薄膜部を設けることができる。 At that time, the plurality of horizontal locking plates 5 extending through the hinge line 5a along the lower edge of the inner periphery of the ring band portion 4 are formed as shown in FIG. The protrusions 14 provided in a ring shape are fitted over the outer periphery of the portion 13, and at that time, as shown in FIG. 4, each of the locking plates 5 is bent in the standing direction, and each of the locking plates 5 The front end portion 5b abuts and engages with the lower portion (the flange portion) of the outer peripheral convex portion 14 of the spout portion 13 upward from below. Therefore, the cap C is locked and closed so as not to be detached from the container outlet 13 and is attached to the container D. The inner ring 1 a on the inner surface of the top portion 1 of the cap C is fitted in a sealed state at the tip opening of the spout portion 13 of the container D. In addition, the thin film part with a pull ring which can be opened by a pull ring can be provided in the inside of the container spout part 13 as needed.

容器Ｄの注出口部１３に螺着した本発明の上記不正開封防止機能付きプラスチックキャップＣは、その円筒部２を開封Ｓ2 方向に回転させると、円筒部２とリングバンド部４はともに、容器注出口部１３の上端方向に徐々に旋回移動する。 In the plastic cap C with the unauthorized opening preventing function of the present invention screwed into the spout 13 of the container D, when the cylindrical part 2 is rotated in the direction of opening S2, the cylindrical part 2 and the ring band part 4 are both in the container. It gradually turns in the upper end direction of the spout 13.

そして、容器注出口部１３外周の凸部１４下部に先端部５ｂが係合しているリングバンド部４に連設している各々係止板５には、該バンド部４の直径を拡張する水平姿勢方向への応力が掛かり、該バンド部４の突出部７にも拡張による張力が掛かり、やがて、該リングバンド部４は、前記突出部７のハーフカット部７ａから破断するので、キャップＣが開封されたことを外観的に容易に確認することできる。 And the diameter of this band part 4 is expanded to each locking plate 5 currently connected to the ring band part 4 which the front-end | tip part 5b is engaging with the convex part 14 lower part of the container pouring part 13 outer periphery. Since the stress in the horizontal posture direction is applied, the projecting portion 7 of the band portion 4 is also tensioned by the expansion, and the ring band portion 4 eventually breaks from the half-cut portion 7a of the projecting portion 7, so that the cap C It can be easily confirmed visually that the has been opened.

なお、本発明におけるリングバンド部４に母線方向に形成される突出部７の外形形状はインジェクション成形の際のキャビティ２２の上方への型抜き移動が行い易い形状であれば特に限定されるものではないが、例えば、図１に示すように、突出部７の上部側が細い幅の直線形状であり、その下部側が台形状となって形成されているものでもよいし、突出部７の上部側の細い幅の形状から徐々に下部側にかけて太く形成されているものであってもよい。 Note that the outer shape of the protrusion 7 formed in the generatrix direction of the ring band portion 4 in the present invention is not particularly limited as long as it can be easily removed from the cavity 22 during injection molding. However, for example, as shown in FIG. 1, the upper portion of the protruding portion 7 may be a linear shape with a narrow width, and the lower portion thereof may be formed in a trapezoidal shape. It may be formed thicker from the narrow width shape gradually toward the lower side.

本発明の不正開封防止機能付きプラスチックキャップＣをインジェクション成形する際には、図２の側断面図に示すように、リングバンド部４の下端部の水平方向をインジェクション成形用のコアー金型２１（雄型）とキャビィティ金型２２（雌型）との互いの接合・分離するパーティングライン２３（金型分離線）として成形され、コアー２１がリングバンド部４の下方から、該バンド部４内及びキャップ円筒部２内に嵌入し、キャビティ２２が、そのキャップ円筒部２の上方より、該キャップ円筒部２及びバンド部４の外面を被覆するように配置されて、例えばキャビティ２２の上部にある溶融樹脂インジェクション孔部２４より溶融樹脂を注入することによりキャップＣが成形されて、該バンド部４の易破断部である突出部７及びハーフカット部７ａ（薄肉部）は、前記コアー２１の凸型部分とキャビティ２２内に設けた凹型部２２ａとにより成形されるものである。 When the plastic cap C with an unauthorized opening preventing function of the present invention is injection-molded, as shown in the side sectional view of FIG. 2, the horizontal direction of the lower end portion of the ring band portion 4 is the core mold 21 for injection molding ( Male part) and cavity mold 22 (female mold) are joined and separated from each other as parting line 23 (mold separation line), and core 21 is formed in ring part 4 from below ring band part 4. And the cavity 22 is disposed so as to cover the outer surfaces of the cap cylinder part 2 and the band part 4 from above the cap cylinder part 2, for example, at the upper part of the cavity 22. The cap C is formed by injecting molten resin from the molten resin injection hole 24, and the protruding portion 7, which is an easily breakable portion of the band portion 4, and the heart It cuts 7a (thin portion) is intended to be formed by a concave portion 22a provided on the convex portion and the cavity 22 of the core 21.

そして、インジェクション成形後のキャップＣを金型内から取り出す際には、前記キャビティ２２を上昇移動させ、前記コアー２１とキャビティ２２とをパーティングライン２３を介して分離して金型を開放して取り出す。 When the cap C after injection molding is taken out from the mold, the cavity 22 is moved upward, the core 21 and the cavity 22 are separated through the parting line 23, and the mold is opened. Take out.

キャビティ２２をパーティングライン２３から上方に引き上げる際には、キャップＣの突出部７を成形するための成形型として、キャビティ２２内の突出部７を成形するための型部分には、凹型部２２ａはあるものの、キャビティ２２内には突出型部（凸型部）は存在しないために、キャビティ２２は成形後のキャップＣの突出部７に引っ掛かることなく円滑に上方に引き上げて、コア２１とキャビティ２２とによる金型を容易に分離開放して成形品を取り出すことができる。 When the cavity 22 is pulled upward from the parting line 23, the mold part for molding the protrusion 7 in the cavity 22 is used as a mold for molding the protrusion 7 of the cap C. However, since there is no projecting mold part (convex mold part) in the cavity 22, the cavity 22 is smoothly pulled up without being caught by the projecting part 7 of the cap C after molding, and the core 21 and the cavity Therefore, the molded product can be taken out by easily separating and opening the mold according to No. 22.

なお、本発明のキャップＣにおいては、前記キャップ円筒部２とリングバンド部４との連設部位にハーフカット線（薄肉部）又は部分的繋ぎ部３を設け、容器Ｄの注出口部１３外周に設けた前記凸部１４下部における隣接する各々係止板５の各々隙間に相当する部位に、各々係止板５がリング状に設けた凸部１４を乗り越えて嵌入した後に各々係止板５の側部に当接して螺着方向及び開封方向のリングバンド部４の回転を阻止するための凸部１
５を設けて、リングバンド部４の回転が阻止された状態で円筒部２を開封方向に回転させることにより、ハーフカット線（薄肉部）又は部分的繋ぎ部３を破断して、キャップ円筒部２とリングバンド部４とを分離して開封できるようにしてもよい。 In addition, in the cap C of the present invention, a half cut line (thin wall portion) or a partial connecting portion 3 is provided at the connection portion between the cap cylindrical portion 2 and the ring band portion 4, and the outer periphery of the spout portion 13 of the container D is provided. The locking plates 5 are inserted into the portions corresponding to the gaps of the adjacent locking plates 5 at the lower part of the protruding portions 14 provided on the locking plate 5 after the locking plates 5 have passed over the protruding portions 14 provided in a ring shape. Convex part 1 for preventing rotation of ring band part 4 in the screwing direction and the unsealing direction
5, the cylindrical portion 2 is rotated in the opening direction in a state in which the rotation of the ring band portion 4 is prevented, thereby breaking the half cut line (thin portion) or the partial connecting portion 3, and the cap cylindrical portion 2 and the ring band part 4 may be separated and opened.

本発明の不正開封防止機能付きプラスチックキャップの一例を示す側面図。The side view which shows an example of the plastic cap with an unauthorized opening prevention function of this invention. 本発明の不正開封防止機能付きプラスチックキャップの一例を示すＡ−Ａ側断面図。The AA side sectional view showing an example of the plastic cap with a tampering prevention function of the present invention. 本発明の不正開封防止機能付きプラスチックキャップの一例を示すＢ−Ｂ側断面図。BB side sectional drawing which shows an example of the plastic cap with an unauthorized opening prevention function of this invention. 本発明の不正開封防止機能付きプラスチックキャップを容器の注出口部に取り付けた状態を説明する側断面図。The sectional side view explaining the state which attached the plastic cap with an unauthorized opening prevention function of this invention to the spout part of the container. 従来の不正開封防止機能付きプラスチックキャップを説明する側面図。The side view explaining the conventional plastic cap with an unauthorized opening prevention function.

Explanation of symbols

Ｃ…不正開封防止機能付きプラスチックキャップ
Ｄ…容器
１…天部２…円筒部２ａ…螺子部３…ハーフカット線４…リングバンド部
５…係止板５ａ…ヒンジ線５ｂ…係止板先端部６…切欠部６ａ…繋ぎ部
７…突出部７ａ…ハーフカット部８…空間部
１１…筒状側壁部１２…底部１３…注出口部１３１３ａ…螺子部
２１…コアー金型２２…キャビティ金型２３…金型のパーティングライン C ... Plastic cap D with tamper-evident prevention function ... Container 1 ... Top part 2 ... Cylindrical part 2a ... Screw part 3 ... Half cut wire 4 ... Ring band part 5 ... Locking plate 5a ... Hinge wire 5b ... Locking plate tip 6 ... Notch 6a ... Connecting part 7 ... Protruding part 7a ... Half cut part 8 ... Space part 11 ... Cylindrical side wall part 12 ... Bottom part 13 ... Outlet part 13 13a ... Screw part 21 ... Core mold 22 ... Cavity mold 23 ... Mold parting line

Claims

A thin plate shape having the same diameter as the cylindrical portion 2 connected to the top portion 1, the cylindrical portion 2, the screw portion 2 a provided on the inner circumference of the cylindrical portion 2, and the lower end portion of the cylindrical portion 2 in a ring shape And a plurality of locking plates 5 extending in a substantially horizontal direction toward the inner center of the ring of the ring band part 4 via a hinge 5a at the lower end of the ring inner periphery of the ring band part 4 A part of the thin ring-shaped ring band part 4 is provided with a protruding part 7 extending in the direction of one bus bar forming the outer peripheral surface of the ring band part 4 and protruding outward. The projecting portion 7 is provided with a half-cut portion 7a capable of easily breaking the ring band portion 4 in the generatrix direction.

The unauthorized opening prevention function according to claim 1, wherein a half-cut portion or a partial connecting portion 3 that can be easily broken is provided along a connecting portion between the cylindrical portion 2 and the thin ring-shaped ring band portion 4. With plastic cap.