EP0508702B1 - Pilfer-proof synthetic resin cap - Google Patents
Pilfer-proof synthetic resin cap Download PDFInfo
- Publication number
- EP0508702B1 EP0508702B1 EP92303008A EP92303008A EP0508702B1 EP 0508702 B1 EP0508702 B1 EP 0508702B1 EP 92303008 A EP92303008 A EP 92303008A EP 92303008 A EP92303008 A EP 92303008A EP 0508702 B1 EP0508702 B1 EP 0508702B1
- 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.)
- Expired - Lifetime
Links
Images
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.
- EP-A-0.381.118 A further relevant prior art cap is disclosed in EP-A-0.381.118. This cap is similar to that discussed above.
- 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.
- Table 1 Torque with which the cap entirely escapes Kgfcm
- Angle of turn at which the weakened line breaks degrees
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
Description
- The present invention relates to a pilfer-proof synthetic resin cap.
- A pilfer-proof synthetic resin cap has heretofore been known 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.
- With this cap, the circumferential band portion is secured by the flap pieces to the mouth of the container. When the cap is opened, therefore, the weakened line is broken and the circumferential band portion only remains at the mouth of the container to exhibit pilfer-proof function.
- In the above cap, however, 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.
- Furthermore, some gap is formed between the lower end of the circumferential band and the mouth of the container, and mischief is often done using this gap.
- 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.
- In 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. According to the above prior art, however, 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.
- A further relevant prior art cap is disclosed in EP-A-0.381.118. This cap is similar to that discussed above.
- The object of the present invention, therefore, 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.
- According to the present invention, there is provided 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.
- According to the present invention, 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.
- Further,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.
- According to the present invention, furthermore, when the cap under the closed condition is turned, 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. As will become obvious from an Example and a Comparative Example appearing later, 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. On the other hand, 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.
- In the cap of the present invention in which 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.
- In the present invention mentioned above, the circumferential curled portion can be formed easily. For example, 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 is a diagram showing the condition where the cap of the present invention is fitted to the mouth of a container;
- Fig. 2 is a diagram showing a preferred embodiment of the cap of the present invention;
- Fig. 3 is a diagram showing the condition where no peripheral curled portion is formed in the cap of the present invention; and
- Fig. 4 is a diagram illustrating means for forming the peripheral curled portion.
- The invention will now be described in detail by way of an embodiment shown in the accompanying drawings.
- Fig. 1 shows the condition where the cap of the present invention is fitted to the mouth of the container. In Fig. 1, the cap (designated generally at 1) has a
cylindrical skirt portion 3 hung from the peripheral edge of a top panel. Acircumferential band 5 is provided at the lower end of theskirt portion 3 via a weakenedline 4. -
Flap pieces 6 are provided maintaining a predetermined distance on the inner surface of thecircumferential band 5. Eachflap 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, theflap pieces 6 come in contact with the lower side of ajaw portion 10 of the container, whereby a great resistance force acts upon opening the cap, the weakenedline 4 is broken, and thecircumferential band 5 is left at the mouth of the container. - According to the present invention, a circumferential
curled portion 7 is formed at the lower end of thecircumferential band 5. That is, when the cap is being opened and theflap pieces 6 come into contact with the lower side of thejaw portion 10 of the container, the circumferentialcurled portion 7 works to push theflap pieces 6 from the lower side of thejaw portion 10, so that theflap pieces 6 are effectively prevented from being elongated or deformed. Therefore, resistance force is reinforced against opening the cap, and thecircumferential band 5 is effectively prevented from entirely escaping at the time of opening the cap. - As is obvious from Fig. 1, furthermore, the circumferential curled
portion 7 that is formed makes narrow the gap between the lower end of thecircumferential 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. - According to the present invention as shown in Fig. 2, furthermore,
notches 8 are formed maintaining a predetermined distance at the tip of the circumferential curledportion 7 so as to be corresponded to theflap pieces 6, such that theflap pieces 6 engage with thenotches 8. That is, according to this embodiment, theflap pieces 6 are fixed in positions to some extent by thenotches 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. - The cap is then secured in a cap-receiving
dies 20 as shown in Fig. 4, and is punched using apunch 21 that is heated at a suitable temperature by a heater or the like, thereby to obtain the cap having the circumferential curledportion 7 formed at the lower end of thecircumferential 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/cm3 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.
Table 1 Torque with which the cap entirely escapes (Kgfcm) Angle of turn at which the weakened line breaks (degrees) Example 1 5.74 203 Comparative Example 1 4.68 359
Claims (2)
- 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 said cylindrical skirt portion via a weakened line, and vertically hinged flap pieces the free edges thereof maintaining a predetermined distance on the inner surface of said 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 said circumferential band the circumferential curled portion being adapted to support the flap pieces when the cap is screwed off.
- A synthetic resin cap according to claim 1, wherein notches are formed maintaining a predetermined distance at the tip of said circumferential curled portion so as to be corresponded to said flap pieces, and said flap pieces are engages with said notches.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07519291A JP3209538B2 (en) | 1991-04-08 | 1991-04-08 | Synthetic resin cap with pill fur proof characteristics |
JP75192/91 | 1991-04-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0508702A1 EP0508702A1 (en) | 1992-10-14 |
EP0508702B1 true EP0508702B1 (en) | 1995-06-07 |
Family
ID=13569088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92303008A Expired - Lifetime EP0508702B1 (en) | 1991-04-08 | 1992-04-06 | Pilfer-proof synthetic resin cap |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0508702B1 (en) |
JP (1) | JP3209538B2 (en) |
KR (1) | KR100194165B1 (en) |
DE (1) | DE69202809T2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3298057B2 (en) * | 1994-05-17 | 2002-07-02 | 日本クラウンコルク株式会社 | Synthetic resin container lid |
DE4433238C1 (en) * | 1994-09-17 | 1996-01-18 | Safety Cap System Ag | Plastic screw cap for closing a bottle or the like |
US5957315A (en) * | 1996-12-17 | 1999-09-28 | Japan Crown Cork Co., Ltd. | Plastic container closure with tamper evident properties |
JP3847868B2 (en) | 1996-12-17 | 2006-11-22 | 日本クラウンコルク株式会社 | Synthetic resin container lid with tamper evident characteristics |
DE10224340A1 (en) | 2002-05-29 | 2003-12-11 | Basf Ag | Low flue gas burning thermoplastic polyurethane |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4709824A (en) * | 1985-12-12 | 1987-12-01 | Tri-Tech Systems International Inc. | Tamper evident plastic caps with lower separable or breakaway portions and a method of forming them |
DE69004820T2 (en) * | 1989-01-30 | 1994-06-16 | Hc Ind | Guarantee closure made of plastic. |
-
1991
- 1991-04-08 JP JP07519291A patent/JP3209538B2/en not_active Expired - Lifetime
-
1992
- 1992-04-06 EP EP92303008A patent/EP0508702B1/en not_active Expired - Lifetime
- 1992-04-06 DE DE69202809T patent/DE69202809T2/en not_active Expired - Lifetime
- 1992-04-07 KR KR1019920005740A patent/KR100194165B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR920019632A (en) | 1992-11-19 |
EP0508702A1 (en) | 1992-10-14 |
KR100194165B1 (en) | 1999-06-15 |
JPH04311461A (en) | 1992-11-04 |
JP3209538B2 (en) | 2001-09-17 |
DE69202809T2 (en) | 1995-10-19 |
DE69202809D1 (en) | 1995-07-13 |
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