JP2022116645A - resin cap - Google Patents

Abstract

To provide a resin cap which can suppress an increase in the number of manufacturing steps and suppress the resin amount to be used with a simple structure, does not require a high machining accuracy, and can be opened without applying a large force.SOLUTION: A resin cap 100 has a band part 110 and an upper lid 120, and is formed with a slit 132 for separating the upper lid 120 from the band part 110. The band part 110 has a cylindrical wall 111 and a locking projection 112 projecting from an inner peripheral surface of the cylindrical wall 111. The upper lid 120 has an upper lid top surface 121 and a skirt wall 123. An unsealing flange 122 protruding outward in a radial direction is disposed on a part of the upper lid top surface 121. An upper portion of an inner peripheral surface of the cylindrical wall 111 and a lower portion of an inner peripheral surface of the skirt wall 123 are connected by a rib 131. A cut groove 132a and a bridge 133 are disposed on the rib 131.SELECTED DRAWING: Figure 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin cap that is attached to and closes the opening of a container.

Conventionally, as a resin cap that is attached to and closes the opening of a container, the upper lid top surface (top plate portion 1), the skirt portion 2 that hangs down from the peripheral edge of the upper lid top surface (top plate portion 1), and the lower inner surface of the skirt portion 2 A notch 12 for cutting off the skirt portion 2 along the circumferential direction in the portion of the skirt portion 2 where the ribs (bridge forming ribs 3) are provided. is formed, and the skirt portion 2 is divided by the notch 12 into a main body portion 2a on the upper lid top surface (top plate portion 1) side and a band portion (Pilfer proof ring 2b) portion on the lower end side. It is known from US Pat.

The resin cap (cap) known in Patent Document 1 has a threaded portion (screw 9) formed on the inner peripheral surface of the body portion 2a so as to be screw-engageable with the mouth portion of the container. A cut 12 is formed by cutting from the outer peripheral side of the portion 2 with a cutter 15 to a depth that does not completely cut the rib (bridging rib 3), and the body portion 2a and the band portion (Pilfer proof ring 2b) is a shape connected by ribs (bridging ribs 3).

Furthermore, fins (wings 10) protruding radially inward are formed on the inner peripheral surface of the band portion (Pilfer proof ring 2b), and when the fins (wings 10) are fitted to the mouth portion of the container, the container is After getting over the locking ring of the opening while deforming, it is restored so as to be positioned below the locking ring.
As a result, when the resin cap (cap) is attached to the mouth of the container and then the body portion 2a side is rotated to open the container, the band portion (Pilfer proof ring 2b) interferes with the fins (wings 10) and the locking ring. Therefore, only the body part 2a side moves upward and the ribs (bridge forming ribs 3) are broken, and only the body part 2a is separated from the mouth of the container. It can demonstrate the pilfer proof function that can be done.

Further, Patent Document 2 discloses a resin cap (cap C) in which a locking ridge is provided on the inner peripheral surface of a band portion (TE band T).

The resin cap (cap C) known in Patent Document 2 includes a top surface of the upper lid (top surface wall R), a skirt wall SK hanging down from the peripheral edge of the top surface of the upper lid (top surface wall R), and a bridge B at the lower end of the skirt wall SK. It has a band part (TE band T) connected via.
Further, after the cap C is formed into a predetermined shape, the skirt wall SK and the outer peripheral surface of the band portion (TE band T) are cut by a cap processing cutter 10 to form a slit SL.

Since the capping cutter 10 has the bridge concave portion 22 in the first cutter portion 20, when the entire circumference of the cap C is cut by the capping cutter 10, the cut is made by the first cutter portion 20. The slits SL and the bridges B, which are parts where cutting is avoided by the bridge recesses 22, are formed alternately and continuously. and numbers can be changed.
In addition, the locking projection is formed so as to protrude radially inward from the inner peripheral surface of the band portion (TE band T), and when the cap C is fitted, the locking ring of the container opening is engaged with the band portion (TE band T). Although it is possible to get over it by elastic deformation of the band T), it interferes with the locking ring when unsealing, so that the band part (TE band T) is prevented from moving upward, so only the upper part moves upward from the skirt wall SK. By breaking B and detaching from the mouth of the container, it is possible to exhibit a pilfer proof function in which the unsealed state can be easily confirmed visually.

In addition, in the resin cap (cap) known in Patent Document 3, the skirt wall (upper fitting cylinder 3′) hanging down from the upper cover top surface (top plate) and the band part (lower fitting cylinder 3″) are laterally thin. They are connected at the thick part (5).
Further, an opening flange (operating piece 10) is formed on a part of the outer peripheral surface of the skirt wall (upper fitting cylinder 3'), and the skirt wall (upper fitting cylinder 3') and the band part (lower fitting cylinder 3') are formed. 3") is a band plate portion (12) that connects the position facing the position where the opening flange (operation piece 10) is provided.

In the resin cap (cap) described in Patent Document 3, when the opening flange (operation piece 10) is pushed up, the lateral thin thick portion (5) is shifted to the lateral thin thick portion (5) near the opening flange (operation piece 10). ) are not formed, and the skirt wall (upper fitting cylinder 3') is separated from the container mouth (bottle mouth 20), and the lateral thin wall portion (5) is torn off from both ends. When completely torn, the skirt wall (upper fitting tube 3') is completely removed and the container mouth (bottle mouth 20) is opened.
At this time, since the skirt wall (upper fitting tube 3') is connected to the cap body (lower fitting tube 3'') by the band plate (12), the skirt wall (upper fitting tube 3') is lost. It can be easily re-sealed without fear of

Japanese Utility Model Laid-Open No. 2-59154 JP 2015-188974 A Japanese Utility Model Laid-Open No. 60-115861

However, the resin caps described in the above patent documents still have room for improvement.

That is, in the resin cap described in Patent Document 1, when a cut is formed from the outer peripheral surface side of the skirt portion with a cutter, the inner peripheral surface side of the skirt portion is placed inside the inner peripheral surface side in order to prevent deformation of the resin cap and perform uniform cutting. It is necessary to bend the fins so that the fins do not interfere with each other when held down with a tool, which may increase the number of manufacturing steps.
Moreover, since the amount of resin required for molding the fins increases, there is a possibility that the manufacturing cost will increase.

In the resin cap described in Patent Document 2, the interval and number of slits and bridges can be adjusted by means of the bridge concave portion provided in the first cutter portion of the cap processing cutter. Since the direction position is random, for example, in the case of a cap that is opened by lifting an opening flange provided on the top lid instead of a screw cap that is threadedly engaged with the mouth of the container, the bridge is formed at a desired position. In addition, there is a risk that the bridge breaking strength at the time of unsealing may become unstable depending on the formation position of the bridge.
In addition, the bridge is formed in advance at a position that protrudes radially inward from the skirt wall like the rib of the resin cap described in Patent Document 1, and the entire circumference is radially outwardly projected without providing a bridge recess. Even if it is cut with a cutter, there is a risk that the locking projections will interfere with the inner tool, resulting in deformation and breakage of the locking projections.

In addition, in the resin cap described in Patent Document 3, in order to form a thin portion such as a laterally thin thick portion connecting the upper lid and the band portion only by injection molding, it is necessary to process the mold more precisely. , there is a possibility that the manufacturing cost increases.

The present invention solves these problems, with a simple structure, it is possible to suppress the increase in the number of manufacturing processes and the amount of resin used, and it does not require high processing accuracy and requires a large force. To provide a resin cap that can be opened without being scratched.

The resin cap of the present invention comprises: a band portion fitted to a bulging portion provided around the mouth of a container; an upper lid connected to the band portion and closing the mouth of the container; and a plurality of bridges and slits for separating the top cover from the resin cap, wherein the band portion has an annular cylindrical wall and a radial direction from the inner peripheral surface of the cylindrical wall The upper lid has an upper lid top surface and a skirt wall hanging down from the peripheral edge of the upper lid top surface, and the top lid has a radius larger than that of the skirt wall. An opening flange projecting outward is provided, and the upper portion of the inner peripheral surface of the cylindrical wall of the band portion and the lower portion of the inner peripheral surface of the skirt wall are connected by a plurality of ribs projecting inward. , the rib is provided with cut grooves extending radially from the outer diameter side to the inner diameter side, and the residual portion of the rib is the bridge, thereby solving the above problems.

According to the resin cap of claim 1, the band portion and the upper lid are connected via the inwardly protruding rib that connects the inner peripheral surface of the main body portion and the inner peripheral surface of the skirt wall. The thickness of the rib can be set without being affected by the thickness of the band portion or the skirt wall, making it easier to design the bridge provided on the rib to have a desired breaking strength.
In addition, the amount of resin that changes with the shape change of the rib can be minimized, and the position in the circumferential direction connecting the band portion and the skirt wall can be easily set at the desired position, saving resources. In addition, it is possible to provide a resin cap provided with an unsealing flange that achieves both unsealability and tamper evidence.
In addition, if cutting grooves and slits are to be formed in post-processing, they can be easily formed by making continuous cuts from the outer peripheral surface of the resin cap all the way around with a cutter that reaches halfway through the ribs. Since the remaining portion of the provided rib serves as a bridge, there is no need to increase the number of manufacturing steps.

According to the configuration of claim 2, the ribs are arranged in a plurality in the circumferential direction and protrude radially inward from the locking ridge, so that the breaking line between the band portion and the skirt wall is formed. In the case of post-processing, when cutting continuously from the outer peripheral surface of the resin cap to the entire circumference with a cutter that reaches halfway through the rib, insert a cylindrical jig inside the resin cap that adheres to the inner peripheral surface of the rib. By inserting it into the cap, distortion of the resin cap when pressed with a cutter can be prevented, and a cut can be made at a uniform depth in the circumferential direction, so that cutting grooves and slits can be stably formed without error.
In addition, when inserting a tubular jig into the resin cap, the locking projections do not interfere with the jig, so deformation and damage of the locking projections can be prevented.
According to the structure of claim 3, the top cover and the band part are integrally molded, and then the breaking line is formed by post-processing. It is possible to improve the production speed and suppress the increase in manufacturing cost due to the complexity of the mold structure.

According to the configuration of claim 4, the ribs are formed on the inner peripheral surface of the band portion and the inner peripheral surface of the skirt wall in the angular range where the opening flange is not formed, so that the opening flange is formed. Since there is no bridge in the angle range, the resistance when starting to lift the opening collar is small, and the force applied to the bridge at a position away from the opening collar works in the shear direction, so that it can be easily broken.
According to the configuration of claim 5, since the inner peripheral surface of the skirt wall has the engaging portion protruding radially inward, the opening of the container can be reopened by the upper lid of the opened resin cap. Even in the case of plugging, the upper lid can be fitted with a predetermined strength so that it does not easily come off from the mouth of the container.

According to the configuration of claim 6, the rib extends upward with a space above the locking projection of the band portion, and is connected to the lower end of the locking portion of the skirt wall of the upper lid. When the resin cap is attached to the container, the locking projection can be reliably locked to the bulging portion of the mouth of the container, and after opening, the upper lid can be reliably resealed to the mouth of the container.
According to the configuration of claim 7, the fracture line has a weak connection portion that connects the tubular wall of the band portion and the skirt wall at a position spaced apart from the rib in the circumferential direction, and the weak connection portion is formed to break more easily than the bridge, so even if an external force is unexpectedly applied to the resin cap, distortion of the relative position between the band portion and the upper lid can be suppressed, and unintended breakage of the bridge can be suppressed.

The perspective view which shows the state which fitted the container mouth part B of the resin cap 100 which concerns on one Embodiment of this invention. FIG. 2 is a bottom view of the resin cap 100 according to one embodiment of the present invention; A-A' cross-sectional view of the resin cap 100 according to one embodiment of the present invention. B-B' cross-sectional view of the resin cap 100 according to one embodiment of the present invention. Sectional drawing which shows the state which fitted the container mouth part B of the resin cap 100 which concerns on one Embodiment of this invention. Sectional drawing which shows the state which removed the top cover 120 from the container mouth part B of the resin cap 100 which concerns on one Embodiment of this invention. FIG. 4 is a cross-sectional view showing a step of forming a breaking line 130 of the resin cap 100 according to one embodiment of the present invention;

A resin cap 100 according to an embodiment of the present invention will be described below with reference to the drawings. It should be noted that only the mouth portion B of the container to which the resin cap 100 is fitted is illustrated.

The resin cap 100 is attached to the mouth portion B of the container to close the container. As shown in FIGS. A top lid 120 is provided.
The band portion 110 is provided with a cylindrical wall 111 and a locking projection 112 which is provided on the inner peripheral surface of the cylindrical wall 111 and protrudes radially inward.

Each of the locking protrusions 112 has a vertical cross-sectional shape of a substantially right-angled triangular shape, and has an upper surface that extends radially inward with a slight downward inclination and a substantially arc-shaped tip portion that extends downward in the radial direction. It has an outwardly sloping lower surface.
In addition, the locking protrusion 112 has a predetermined thickness in the circumferential direction, and is not greatly deformed.

The top lid 120 includes a top lid top surface 121, a skirt wall 123 hanging down from the peripheral edge of the top lid top surface 121, and an opening flange 122 projecting radially outward from the skirt wall 123 (in this embodiment, the opening flange 122 projecting radially outward from the same height as the upper lid top surface 121 in the axial direction) and an inner ring 124 hanging down from the upper lid top surface 121 radially inward of the skirt wall 123 . .
Further, in this embodiment, a contact ring 126 is provided between the skirt wall 123 and the inner ring 124 and protrudes downward from the top surface 121 of the upper lid.
An inner peripheral surface of the skirt wall 123 is provided with a locking portion 125 projecting radially inward.

The upper inner peripheral surface of the tubular wall 111 and the lower inner peripheral surface of the skirt wall 123 are connected by a plurality of ribs 131 projecting radially inward and extending in the vertical direction. A slit 132 radially penetrating the entire periphery other than the rib 131 is arranged between the ribs 131 to form a fracture line 130 .
In this embodiment, the rib 131 does not exist within a range of 45° clockwise and counterclockwise from the circumferential center of the opening collar 122, and is spaced apart in the circumferential direction at other locations. Ten ribs 131 are arranged, and each of the ribs 131 has a substantially rectangular shape elongated in the axial direction.
The rib 131 protrudes radially inward from the locking ridge 112, and a cut groove 132a is formed at the same height as the slit 132 of the rib 131 radially from the outer diameter side to the inner diameter side, A bridge 133 is formed on the rib 131 on the radially inner side of the cutting groove 132a.

The inner diameters of the inner peripheral surfaces of the tubular wall 111 and the skirt wall 123 at the height where the ribs 131 are formed are uniform.
In addition, the outer diameter of the outer peripheral surface of the upper portion of the skirt wall 123 where the opening flange 122 is not formed is smaller than the outer diameter of the outer peripheral surface of the tubular wall 111 .

The rib 131 is formed on the inner peripheral surface of the cylindrical wall 111 within an angular range of up to 45 degrees clockwise and counterclockwise with respect to the circumferential center of the opening flange 122 when viewed from the center of the upper lid 120. and the inner peripheral surface of the skirt wall 123 is desirably formed.
This makes it easier to open the resin cap 100 .

Here, an example of a method for forming the cut groove 132a and the bridge 133 that constitute the fracture line 130 will be described with reference to FIG.
First, the resin cap 100 without the cut groove 132a molded by a predetermined method is turned upside down and arranged so that the top surface 121 side of the upper lid is attached to the stage S. As shown in FIG.
Next, the jig T is pressed against the inner surface of the top surface 121 of the upper lid.
At this time, by setting the outer peripheral surface of the jig T to have the same diameter as the inner peripheral surface of the rib 131 , the outer peripheral surface of the jig T is kept in contact with the inner peripheral surface of the rib 131 .

In this state, the cutter C is approached from the outer peripheral surface side of the cylindrical wall 111 and the skirt wall 123 to cut the entire circumference to a predetermined depth to form a cutting groove 132a.
At this time, even if a force that distorts the resin cap 100 is generated by the pressing force of the cutter C, the distortion of the resin cap 100 can be prevented because the inner peripheral surface of the rib 131 is pressed by the outer peripheral surface of the jig T. , the cutter C forms the cutting groove 132a and can surely cut to a predetermined depth in the height region where the rib 131 is located in the axial direction.
In addition, since the cutter C is moved closer to cut the entire circumference to a predetermined depth, the slit 132 can be formed at the same time as the cutting groove 132a is formed, and the number of manufacturing steps is not increased.

Further, by cutting ribs 131 with cutter C, ribs 131 form breakable bridges 133 .
At this time, the breaking strength of the bridge 133 can be easily adjusted by adjusting the depth of cut into the rib 131 in the radial direction.
Further, since the rib 131 connecting the band portion 110 and the upper lid 120 is positioned in advance at the time of molding, the rib 131 can be reliably arranged at a desired position by adjusting the mold.

In addition, when the cutter C makes a cut, the depth is set so that it does not completely penetrate the cylindrical wall 111 and the skirt wall 123, thereby forming a thin-film weak connection portion having a lower breaking strength than the bridge 133. As a result, even if an external force is unexpectedly applied to the resin cap 100, distortion of the relative position between the band portion 110 and the upper lid 120 can be suppressed, and unintended breakage of the bridge 133 can also be suppressed.
The weak connection portion is not formed into a thin film by the cutter C, but is formed into an elongated rib shape having a lower breaking strength than the bridge 133 by adjusting the mold at the time of molding. Alternatively, they may be spaced apart.

Next, the state of fitting the resin cap 100 according to one embodiment of the present invention to the container mouth portion B and the unsealing state will be described with reference to FIGS. 5 and 6. FIG.

First, the resin cap 100 is pressed from above the mouth portion B of the container to be fitted.
At this time, the locking ridge 112 of the cylindrical wall 111 interferes with the bulging portion D of the container mouth portion B, but the cylindrical wall 111 temporarily expands in diameter, causing the locking ridge 112 to move the cylindrical wall 111. It climbs over and moves to the lower part of the cylindrical wall 111. - 特許庁
As a result, the band portion 110 maintains the state in which the locking projection 112 is positioned below the bulging portion D. As shown in FIG.
Further, the inner ring 124 of the upper lid 120 enters the container mouth portion B so as to be in close contact with the inner peripheral surface of the container mouth portion B, and moves downward to a position where the engaging portion 125 rides over the projecting portion E of the container mouth portion B. Then, the contact ring 126 comes into contact with the upper end of the projecting portion E of the container mouth portion B, and the fitting of the resin cap 100 to the container mouth portion B is completed.

When the resin cap 100 is to be unsealed, the periphery of the opening flange 122 is gradually lifted by applying upward force such as by placing a finger on the opening flange 122 .
At this time, since the bridge 133 is not formed around the opening collar 122, the resistance when starting to lift the opening collar 122 can be reduced.

When the opening flange 122 starts to be lifted, the band portion 110 also tries to rise together with the upper lid 120, but the band portion 110 cannot rise above the position where the locking projection 112 interferes with the bulging portion D. The distance between the upper lid 120 and the band portion 110 is gradually increased.
At this time, the bridge 133 connecting the upper lid 120 and the band portion 110 receives a shearing force in order from a position closer to the opening flange 122 and is gradually broken.
As a result, the upper lid 120 is gradually separated from the container mouth portion B from the opening flange 122 side, and the bridge 133 is completely broken, whereby the upper lid 120 is completely separated from the band portion 110, and the opening of the resin cap is completed. .

Since the upper lid 120 is provided with the engaging portion 125, the container can be re-plugged by hooking the engaging portion 125 on the projecting portion E of the mouth portion B of the container.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the present invention described in the claims. It is possible.

In the above-described embodiment, the ribs are formed on the inside of the tubular wall within an angular range of up to 45 degrees clockwise and counterclockwise with respect to the circumferential center of the opening collar when viewed from the center of the top cover. Although it has been described that the ribs are formed avoiding the peripheral surface and the inner peripheral surface of the skirt wall, the position where the ribs are formed is not limited to this. It may be formed, and the ribs may be arranged randomly regardless of the position of the opening collar.
Further, in the above-described embodiment, the shape of each rib is a substantially rectangular shape elongated in the axial direction in this embodiment. Therefore, it may have various shapes such as a rectangular shape elongated in the circumferential direction, a hemispherical shape, and a trapezoidal shape.

Further, in the above-described embodiment, the opening flange is provided on a part of the outer peripheral edge of the upper lid top surface, but the formation position of the opening flange is not limited to this. It may be formed on the entire circumference of the peripheral edge, or may be formed to protrude from a part of the outer peripheral surface of the skirt wall.
Further, in the above-described embodiment, as shown in FIG. 2, the locking protrusion is not present at the circumferential position where the opening flange is located, but it is locked at the circumferential position where the opening flange is located. Protrusions may be arranged, and locking protrusions may be arranged in a ring in the circumferential direction.

In the above-described embodiment, the upper lid is completely separated from the band portion when the resin cap is opened. However, the configuration of the upper lid and the band portion is not limited to this. may be connected by
In addition, in the above-described embodiment, the upper cover is provided with the engaging portion, but the configuration of the upper cover is not limited to this, and for example, the engaging portion may not be provided.

DESCRIPTION OF SYMBOLS 100... Resin cap 110... Band part 111... Cylindrical wall 112... Locking protrusion 120... Top lid 121... Top surface of top lid 122... Opening flange 123... Skirt wall 124... Inner ring 125... Locking portion 126... Contact ring 130... Fracture line 131... Rib 132... Slit 132a... Cutting groove 133... Bridge B.・・・ container opening D ・・・ swelling part E ・・・ projecting part C ・・・ cutter T ・・・ jig S ・・・ stage

Claims (7)

A band portion fitted to the bulging portion provided around the mouth of the container, an upper lid connected to the band portion and closing the mouth of the container, and a plurality of parts separating the band portion and the top lid along the circumferential direction. A resin cap having a fracture line formed with a bridge and a slit of
The band portion has an annular cylindrical wall and a locking ridge protruding radially inward from an inner peripheral surface of the cylindrical wall,
The upper lid has an upper lid top surface and a skirt wall hanging down from the peripheral edge of the upper lid top surface,
The upper lid is provided with an opening flange protruding radially outward from the skirt wall,
an upper portion of the inner peripheral surface of the cylindrical wall of the band portion and a lower portion of the inner peripheral surface of the skirt wall are connected by a plurality of inwardly projecting ribs;
A resin cap according to claim 1, wherein said rib is provided with cut grooves extending radially from an outer diameter side to an inner diameter side, and said remaining portion of said rib is said bridge. 2. The resin cap according to claim 1, wherein a plurality of said ribs are arranged in the circumferential direction and protrude radially inward from said locking projection. 3. The resin cap according to claim 1, wherein said upper lid and said band portion are integrally formed, and then said bridge and said slit are simultaneously formed by post-processing. 4. The rib according to any one of claims 1 to 3, wherein the ribs are formed on the inner peripheral surface of the band portion and the inner peripheral surface of the skirt wall in an angular range where the opening flange is not formed. The resin cap described in Cr. 5. The resin cap according to any one of claims 1 to 4, wherein the inner peripheral surface of the skirt wall has an engaging portion projecting radially inward. 6. The rib according to claim 5, wherein said rib extends vertically upward with a space above said locking ridge of said band portion and connects to a lower end of said locking portion of said skirt wall of said top cover. resin cap. The fracture line has a weak connection portion that connects the tubular wall of the band portion and the skirt wall at a position spaced apart from the rib in the circumferential direction,
7. The resin cap according to any one of claims 1 to 6, wherein the weak connection portion is formed to break more easily than the bridge.

Images