EP0508702A1 - Diebstahlsicherer Verschluss aus Kunstharz - Google Patents

Diebstahlsicherer Verschluss aus Kunstharz Download PDF

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Publication number
EP0508702A1
EP0508702A1 EP92303008A EP92303008A EP0508702A1 EP 0508702 A1 EP0508702 A1 EP 0508702A1 EP 92303008 A EP92303008 A EP 92303008A EP 92303008 A EP92303008 A EP 92303008A EP 0508702 A1 EP0508702 A1 EP 0508702A1
Authority
EP
European Patent Office
Prior art keywords
cap
circumferential
circumferential band
flap pieces
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92303008A
Other languages
English (en)
French (fr)
Other versions
EP0508702B1 (de
Inventor
Kouichi Doi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Closures Co Ltd
Original Assignee
Japan Crown Cork Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Crown Cork Co Ltd filed Critical Japan Crown Cork Co Ltd
Publication of EP0508702A1 publication Critical patent/EP0508702A1/de
Application granted granted Critical
Publication of EP0508702B1 publication Critical patent/EP0508702B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
    • B65D41/3423—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with flexible tabs, or elements rotated from a non-engaging to an engaging position, formed on the tamper element or in the closure skirt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper

Definitions

  • the present invention relates to a pilfer-proof synthetic resin cap.
  • a pilfer-proof synthetic resin cap having a top panel, a cylindrical skirt portion hung from the peripheral edge of the top panel, a circumferential band provided at the lower end of the cylindrical skirt portion via a weakened line, and flap pieces provided maintaining a predetermined distance on the inner surface of the circumferential band portion to engage with a jaw portion formed at the mouth of a container, and has been widely put into practical use.
  • the flap pieces are not strong enough to fully engage with the jaw portion formed at the mouth of the container and, besides, the weakened line is not often broken even when the cap is open; i.e., the cap is often entirely removed together with the circumferential band.
  • Japanese Laid-Open Patent Publication No. 296666/1990 discloses a cap having an upwardly directed flexible tab formed on the circumferential band portion and interference beads formed at the lower end of the circumferential band to inwardly protrude.
  • the cap of the above prior art an increased engaging force is obtained between the circumferential band and the jaw portion formed at the mouth of the container due to the flexible tab and the interference beads that work in cooperation together. Therefore, the cap that is opened is effectively prevented from entirely removed and besides the gap formed between the lower end of the circumferential band and the mouth of the container is filled with the interference beads.
  • the cap is molded very difficulty since it has two kinds of protrusions, i.e., flexible tab and interference beads on the inside of the circumferential band. That is, the caps of this type are usually produced by such molding means as injection molding using a suitable metal mold. In the case of the above cap, however, it will be very difficult to remove the metal mold after the molding operation as considered from the shape of the circumferential band portion. In fact, the above prior art does not at all describe concerning the molding means.
  • the object of the present invention is to provide a pilfer-proof synthetic resin cap that can be formed very easily, that is effectively prevented from entirely escaping at the time it is opened, and that effectively prevents mischievous deeds that may be done by utilizing the gap formed between the lower end of the circumferential band and the mouth of the container.
  • a pilfer-proof synthetic resin cap comprising a top panel, a cylindrical skirt portion hung from the peripheral edge of the top panel, a circumferential band provided at the lower end of the cylindrical skirt portion via a weakened line, and flat pieces provided maintaining a predetermined distance on the inner surface of the circumferential band portion to engage with the jaw portion formed at the mouth of a container, wherein a circumferential curled portion that is inwardly curled is formed at the lower end of the circumferential band.
  • a distinguished feature resides in an inwardly directed circumferential curled portion that is formed at the lower end of the circumferential band.
  • the circumferential curled portion reinforces the engaging force between the flap pieces and the jaw portion at the mouth of the container and helps effectively avoid the circumferential band from entirely escaping when the cap is opened.
  • the gap formed between the lower end of the circumferential band and the container is filled with the circumferential curled portion, contributing to effectively preventing mischievous deeds that may be done by using the gap.
  • the weakened line starts breaking with a small angle of turn of the cap since the engaging force has been reinforced between the flap pieces and the jaw portion at the mouth of the container.
  • the above-mentioned angle of turn is about 200 degrees in the case of the cap of the present invention whereas the above angle of turn is about 360 degrees in the case of the conventional cap without having the circumferential curled portion which is very greater than that of the cap of the present invention.
  • a large angle of turn means that the weakened line is not broken even when the cap is turn to such a degree that the sealing of cap is broken, which is quite undesirable from the standpoint of preventing mischiefs.
  • a small angle of turn accomplished by the present invention as described above means that the weakened line breaks when the cap is rotated to such a degree that the sealing of cap is broken; i.e., breakage of the sealing of cap is revealed to the general consumers enabling mischievous deeds to be prevented in advance.
  • the flap pieces are protected by the circumferential curled portion, furthermore, the flap pieces are effectively prevented from being deformed during the period of from when the cap is molded until when the cap is tightly fitted to the mouth of the container, which is an additional advantage of the present invention.
  • the circumferential curled portion can be formed easily.
  • a cap provided, via a weakened line, with a circumferential band having flap pieces is molded by the injection molding, and then a circumferential cured portion is formed at the lower end of the circumferential band relying on a very simple means.
  • Fig. 1 shows the condition where the cap of the present invention is fitted to the mouth of the container.
  • the cap (designated generally at 1) has a cylindrical skirt portion 3 hung from the peripheral edge of a top panel.
  • a circumferential band 5 is provided at the lower end of the skirt portion 3 via a weakened line 4.
  • Flap pieces 6 are provided maintaining a predetermined distance on the inner surface of the circumferential band 5.
  • Each flap piece 6 is oriented in the same direction as the direction in which the cap 1 is opened. That is, as the cap is turned so as to be opened, the flap pieces 6 come in contact with the lower side of a jaw portion 10 of the container, whereby a great resistance force acts upon opening the cap, the weakened line 4 is broken, and the circumferential band 5 is left at the mouth of the container.
  • a circumferential curled portion 7 is formed at the lower end of the circumferential band 5. That is, when the cap is being opened and the flap pieces 6 come into contact with the lower side of the jaw portion 10 of the container, the circumferential curled portion 7 works to push the flap pieces 6 from the lower side of the jaw portion 10, so that the flap pieces 6 are effectively prevented from being elongated or deformed. Therefore, resistance force is reinforced against opening the cap, and the circumferential band 5 is effectively prevented from entirely escaping at the time of opening the cap.
  • the circumferential curled portion 7 that is formed makes narrow the gap between the lower end of the circumferential band 5 and the wall of mouth of the container, contributing to effectively preventing any mischievous deed that may be done by utilizing the gap.
  • notches 8 are formed maintaining a predetermined distance at the tip of the circumferential curled portion 7 so as to be corresponded to the flap pieces 6, such that the flap pieces 6 engage with the notches 8. That is, according to this embodiment, the flap pieces 6 are fixed in positions to some extent by the notches 8, and produce further increased resistance force in the direction of opening the cap.
  • the above-mentioned cap of the present invention has an advantage in that it can be formed very easily. That is, the cap without circumferential curled portion 7 is formed by a widely known molding means such as injection molding as shown in Fig. 3 from which it is obvious that the lower portion of the circumferential band portion 5 (lower portion of the flap pieces 6) of the cap is substantially flat. Therefore, the cap is removed from the metal mold without any difficulty and is molded easily.
  • a widely known molding means such as injection molding as shown in Fig. 3 from which it is obvious that the lower portion of the circumferential band portion 5 (lower portion of the flap pieces 6) of the cap is substantially flat. Therefore, the cap is removed from the metal mold without any difficulty and is molded easily.
  • the cap is then secured in a cap-receiving dies 20 as shown in Fig. 4, and is punched using a punch 21 that is heated at a suitable temperature by a heater or the like, thereby to obtain the cap having the circumferential curled portion 7 formed at the lower end of the circumferential band 5 as contemplated by the present invention.
  • a cap (20.4 mm in height of cap and 29.8 mm in outer diameter of cap) of a shape shown in Fig. 1 was molded using a polypropylene resin having a density of 0.912 g/cm 3 and a melt flow rate (230°C) of 10 g/10 min.
  • the cap was tightly fitted to a 1500 ml polyethylene terephthalate bottle. Under this condition, the angle of turn of the cap at which the weakened line starts breaking was measured. Moreover, a cap without the weaking line was molded in the same manner as described above, and was tightly fitted to the above-mentioned bottle to measure a torque with which the cap entirely escapes from the bottle. The results were as shown in Table 1. Measured values are averages of ten samples of each of them.
  • a cap (19.1 mm in height of cap and 29.8 mm in outer diameter of cap) was molded in the same manner as in Example 1 but without forming the circumferential curled portion, and a torque with which it entirely escapes and the angle of turn at which the weakened line breaks were measured. The results were as shown in Table 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP92303008A 1991-04-08 1992-04-06 Diebstahlsicherer Verschluss aus Kunstharz Expired - Lifetime EP0508702B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP07519291A JP3209538B2 (ja) 1991-04-08 1991-04-08 ピルファープルーフ特性を有する合成樹脂製キャップ
JP75192/91 1991-04-08

Publications (2)

Publication Number Publication Date
EP0508702A1 true EP0508702A1 (de) 1992-10-14
EP0508702B1 EP0508702B1 (de) 1995-06-07

Family

ID=13569088

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92303008A Expired - Lifetime EP0508702B1 (de) 1991-04-08 1992-04-06 Diebstahlsicherer Verschluss aus Kunstharz

Country Status (4)

Country Link
EP (1) EP0508702B1 (de)
JP (1) JP3209538B2 (de)
KR (1) KR100194165B1 (de)
DE (1) DE69202809T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008420A1 (de) * 1994-09-17 1996-03-21 Safety Cap System Ag Schraubkappe aus kunststoff zum verschliessen einer flasche oder dergleichen
WO2003099896A1 (de) 2002-05-29 2003-12-04 Basf Aktiengesellschaft Rauchgasarm verbrennendes thermoplastisches polyurethan

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3298057B2 (ja) * 1994-05-17 2002-07-02 日本クラウンコルク株式会社 合成樹脂製容器蓋
US5957315A (en) * 1996-12-17 1999-09-28 Japan Crown Cork Co., Ltd. Plastic container closure with tamper evident properties
JP3847868B2 (ja) 1996-12-17 2006-11-22 日本クラウンコルク株式会社 タンパーエビデント特性を備えた合成樹脂製容器蓋

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003561A1 (en) * 1985-12-12 1987-06-18 Tri-Tech Systems International, Inc. Tamper evident closure and method of manufacture
EP0381118A1 (de) * 1989-01-30 1990-08-08 H-C Industries, Inc. Garantieverschluss aus Kunststoff

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003561A1 (en) * 1985-12-12 1987-06-18 Tri-Tech Systems International, Inc. Tamper evident closure and method of manufacture
EP0381118A1 (de) * 1989-01-30 1990-08-08 H-C Industries, Inc. Garantieverschluss aus Kunststoff

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996008420A1 (de) * 1994-09-17 1996-03-21 Safety Cap System Ag Schraubkappe aus kunststoff zum verschliessen einer flasche oder dergleichen
WO2003099896A1 (de) 2002-05-29 2003-12-04 Basf Aktiengesellschaft Rauchgasarm verbrennendes thermoplastisches polyurethan

Also Published As

Publication number Publication date
KR920019632A (ko) 1992-11-19
JPH04311461A (ja) 1992-11-04
DE69202809D1 (de) 1995-07-13
EP0508702B1 (de) 1995-06-07
KR100194165B1 (ko) 1999-06-15
DE69202809T2 (de) 1995-10-19
JP3209538B2 (ja) 2001-09-17

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