JP2009220848A - Plastic cap excellent in capping and categorized disposability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic cap configured so that an engagement projection of a cap body can slide over an engagement part of a container mouth part smoothly, a decrease or the like in fitting force of an upper lid which results from capping is effectively prevented, and categorized disposability is excellent. <P>SOLUTION: A thin-wall breakable line 13 is formed in a cap body skirt part below the engagement projection 11 of skirt parts 3a and 3b so as to extend in a peripheral direction and so as to be torn. The plastic cap can be easily detached from the container mouth part 50 after exhaustion of the content, by tearing off the breakable line 13. On the internal face of the skirt parts are: a plurality of upper ribs 12, each of which is formed below the engagement projection and has a tapering internal face whose inside diameter increases toward a lower side; and a plurality of lower ribs 14, each of which is formed below the breakable line and has a tapered internal face whose inside diameter increases toward a lower side. The plurality of upper ribs and the plurality of lower ribs are formed so as to be displaced from each other in the peripheral direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plastic cap that is fitted and fixed to a container mouth by a stopper. More specifically, the present invention is excellent in stoppering performance to a container mouth and removes the cap from the container mouth. At this time, the present invention relates to a plastic cap that is easy to grasp and can be easily detached from the container mouth.

  A plastic cap in which a cap body is fitted and fixed to a container mouth is generally fitted and fixed to a container mouth by a stoppering operation. Since it must be overcome, the skirt portion of the cap body needs to expand in the direction of increasing its diameter. On the other hand, in the plastic cap in which the cap body is fitted and fixed to the container mouth portion, it is desired that it can be easily detached from the container mouth portion after use of the contents from the request for separation and disposal. A weakening line that breaks the engagement of the cap is formed. From the viewpoint of preventing breakage of the weakening line at the time of plugging, various improvements have been made to the cap plugging performance.

  For example, in Patent Document 1 below, an outer cylinder is made to face an outer surface of a skirt portion of a cap body fitted and fixed to a container mouth portion via a cut surface, and a lower end (or upper end) of the skirt portion and an outer cylinder are connected. A cap having a structure in which a tearing score extending in the axial direction is provided on the outer cylinder while being connected by a breakable bridging portion has been proposed. In the cap described in Patent Document 1, the skirt portion is proposed. A plurality of skirts at the lower end portion of the skirt portion where the engagement protrusions are provided so that the engagement force between the cap body and the container mouth portion is weakened when the outer shell is released from the tagging force by the outer cylinder. When the slit is provided, the score is torn, and the outer cylinder is rolled in the circumferential direction, the lower end portion of the opened skirt can be easily lifted upward by hand. Although removal from parts is adapted to be able to easily perform, by the formation of the slits as described above, reduction of engaging force between the engaging projection and the container mouth portion of the skirt portion the lower end is inevitable.

  In order to solve such a problem, the applicant of the present invention has proposed that the skirt portion of the cap body has an inner wall portion in which a plurality of engagement protrusions with the container mouth portion are formed at appropriate intervals in the circumferential direction, The outer wall portion is formed longer than the inner wall portion, and a tear region and a fixing region are formed in such a skirt portion, and ¼ of the entire circumference of the cylindrical side wall. The above (90 degrees or more) is a tear region, and an axial weakening line extending in the axial direction from the upper end to the lower end is formed on the outer wall portion at the boundary between the tear region and the fixed region. Proposed cap.

Japanese Patent No. 3161977 JP 2007-22567 A

However, even in the cap described above, since the engaging protrusion of the cap body cannot get over the engaging portion of the container mouth sufficiently smoothly, the stoppering load is applied to the upper lid, and the upper lid becomes buckled. As a result, the fitting force of the upper lid to the cap body is reduced, resulting in a problem that the sealing performance and the like are lowered. A thin-walled cap made of a highly rigid resin is also formed especially for the purpose of reducing the weight of the cap. However, in such a cap, the influence of the plugging load is significant, so the cap is smoother when plugging. It is desired that the container can be fitted and fixed to the container mouth.
Further, when the container is made of glass, a stepped portion based on a parting line at the time of forming the container is formed on the outer surface of the tip of the container mouth portion, and this stepped portion prevents smooth engagement of the engaging protrusion on the cap body. Sometimes it becomes.
Furthermore, in order to improve the plugging performance, it is conceivable to provide a tapered protrusion whose inner diameter increases as it goes downwards at the lower part of the engaging protrusion. Therefore, when removing the cap from the container mouth portion, the portion of the tapered protrusion is gripped, which causes a problem that the touch is painful.

Therefore, the object of the present invention is that when the stopper is plugged, the engaging protrusion of the cap body can smoothly get over the engaging portion of the container mouth, and is excellent in stoppering performance. It is an object of the present invention to provide a plastic cap in which a decrease or the like is effectively prevented.
Another object of the present invention is to provide a plastic cap that is easy to grasp and can be easily removed from the container mouth when the cap for separation and disposal is removed from the container mouth.

  According to the present invention, the cap main body is composed of a top plate portion and a skirt portion, and an engagement protrusion that engages with an engagement protrusion formed on the outer surface of the container mouth portion is formed on the inner surface of the skirt portion. By tearing a tearable thin-walled tear line extending in the circumferential direction formed on the cap body skirt portion below the engagement protrusion of the skirt portion, which consists of an upper lid attached to the cap body so as to cover the top plate portion In the plastic cap that can be easily removed from the container mouth after use of the contents, the inner surface of the skirt has an upper rib formed on the lower surface of the engaging protrusion and having a tapered surface whose inner diameter increases as the inner surface goes downward. And a lower rib having a tapered surface formed below the breaking line and having an inner diameter increasing as the inner surface goes downward, Plastic cap with excellent separation disposability, characterized in that the upper rib and the lower rib are formed in plural at positions displaced in the circumferential direction is provided.

In the plastic cap of the present invention,
1. The taper surface of the lower rib is formed only at the lower part, and the upper part forms a vertical surface,
2. The upper and lower ribs are alternately formed over the entire circumference;
3. The cap body has a top plate portion having a planned opening portion for pouring contents and a skirt portion descending from the periphery of the top plate portion, and a container mouth portion is fitted and fixed inside the skirt portion, and the upper lid is a cap. The cap body is hinged to the main body, and the skirt portion of the cap body includes an inner wall portion and an outer wall portion that extends downward from the inner wall portion and is located around the inner wall portion. The skirt portion is formed with a tearable tear region formed by the breaking line in the inner wall portion and the outer wall portion, and a fixing region that cannot be torn, and the tear region and the fixing region. An axial weakening line extending in the axial direction from the upper end to the lower end is formed in the outer wall portion at one boundary portion, and the tear region is at least 1/4 or more of the entire circumference of the skirt portion Nitta In the tearing region, the lower end portion of the inner wall portion is connected to the outer wall portion by a slit capable of tearing the thickness portion of the skirt portion extending deeply downward from the upper end. The fixing region is connected to the outer wall portion by a thick connecting portion in which the lower end portion of the inner wall portion cannot be torn by a slit that extends shallowly from the upper end to the thickness portion of the skirt portion. Or formed with a top plate portion and a skirt portion in which the inner wall portion and the outer wall portion are integrated with each other, and the inner surface of the skirt portion is formed on the outer surface of the container mouth portion. The container mouth portion is formed by a cap comprising a cap main body formed with an engaging projection to be engaged with the engaged portion, and an upper lid attached to the cap main body so as to cover the top plate portion of the cap main body. In plastic cap to be fitted and fixed, wherein the skirt inner surface, the projection having a smaller inner diameter than the maximum outer diameter of and the engaging portion formed in the lower portion of the projection for engagement are formed in plural,
Is preferred.
In the present invention, the inner diameters of the upper and lower ribs mean the diameters of virtual circles passing through the inner surfaces of the plurality of upper and lower ribs.

In the plastic cap of the present invention, the upper rib having a tapered surface whose inner diameter increases as the inner surface goes downward, and the lower surface of the engagement protrusion on the inner surface of the skirt, and the inner surface is formed below the breaking line. A lower rib having a tapered surface whose inner diameter increases as it goes is formed, and a plurality of the upper rib and the lower rib are formed at positions shifted from each other in the circumferential direction. The cap skirt is gradually pushed outward in the radial direction by the taper formed on the upper rib, so that the engagement protrusion of the cap body can smoothly get over the engagement part of the container mouth, and the upper lid buckles. Is effectively prevented, and a problem such as a decrease in the fitting force of the upper lid does not occur.
Therefore, in the plastic cap of the present invention, it is possible to smoothly perform the plugging operation even when the mouth portion has a step portion due to a parting line generated during molding, such as a glass bottle.
In addition, because the upper part of the lower rib is formed vertically, it is effectively prevented that the hand holding this part becomes painful when tearing the break line further when separating waste. It has a separate disposal property.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a side sectional view of an example of a state in which the cap of the present invention is applied to a container mouth, FIG. 2 is a side sectional view in a state where an upper cover of the cap shown in FIG. 1 is opened, and FIG. FIG. 4 is a partially enlarged cross-sectional view in a state before the cap is put on the container mouth when the cap shown in FIG. 1 is plugged, and FIG. 4 shows the container mouth when the cap shown in FIG. FIG. 5 is a partially enlarged cross-sectional view showing a state in which the cap shown in FIG. 1 is stoppered and started to be attached to the container mouth. FIG. 6 is a partially enlarged cross-sectional view for explaining the state before and after breaking of the breaking line for separating and discarding the cap shown in FIG. 1, and FIG. 7 shows the top lid of the cap shown in FIG. It is a top view in the open state.

The cap of the present invention shown in FIGS. 1 to 7 includes a cap main body 1 and an upper lid 30, and the cap main body 1 is, roughly speaking, a top plate portion 2 and a skirt depending from a peripheral portion of the top plate portion 2. Part 3. An inner ring 4 is formed on the inner surface of the top plate portion 2 so as to extend downward with a gap from the skirt portion 3. The cap body 1 is mounted on the container mouth portion 50 by fitting the container mouth portion 50 into the space between the inner ring 4 and the skirt portion 3.
Further, the top plate portion 2 is formed with a score 5 for forming a dispensing opening. On the top surface side of the top plate portion 2, a pull ring 6 for breaking the score is provided via a column 7. By pulling the pull ring 6, the score 5 is broken, and an opening for pouring out the contents is formed in the top plate portion 2.

  Further, a pouring tube portion 8 for guiding pouring liquid is formed on the upper surface side of the top plate portion 2 so as to surround the score 5, and the content liquid poured out through the pouring opening is , And is guided by the dispensing cylinder portion 8. The upper end of the dispensing cylinder portion 8 spreads in a trumpet shape so that the liquid can be discharged smoothly. Further, as shown in FIG. The dispensing cylinder portion 8 is formed with a low height so that the upper lid 30 is not obstructed from turning when the upper lid 30 is closed. Further, a circumferential projection 9 for holding the upper lid 30 is formed on the outside of the dispensing cylinder portion 8.

1 to 7, the skirt part 3 of the cap body 1 is formed of an inner wall part 3a and an outer wall part 3b longer than the inner wall part 3a. The inner wall portion 3a and the outer wall portion 3b are clearly partitioned by the slit 10 extending downward from the upper end over the entire circumference of the thick portion.
An annular engaging protrusion 11 is formed on the inner wall 3a of the skirt 3 over the entire inner surface of the lower end. The cap main body 1 is fitted and fixed to the container mouth part 50 by engaging the engaging protrusion 11 with the engaging part 51 formed on the outer surface of the container mouth part 50.
The upper lid 30 is connected to the upper end portion of the outer wall portion 3 b of the skirt portion 3 of the cap body 1 by a hinge 31.

The upper lid 30 is formed from a top plate portion 32 and a skirt portion 33 extending from the periphery of the top plate portion 32. A circumferential projection 34 for sealing is formed on the inner surface of the top plate portion 32, and when the upper lid 30 is turned and closed, the circumferential projection 34 for sealing is provided on the dispensing tube portion 8 for guiding the dispensing liquid. It adheres to the inner surface, and by this adhesion, the sealing performance after the opening for dispensing after breaking the score 5 is secured.
Further, a concave portion 35 is formed in a lower portion of the inner surface of the skirt portion 33 of the upper lid 30, and the upper end portion of the circumferential projection 9 of the cap body 1 is closed by engaging with the concave portion 35. Further, the upper lid 30 is held stably. Further, an opening hook 36 is provided on the outer surface of the skirt portion 33 of the upper lid 30 on the opposite side of the hinge connecting portion 31 described above. The upper lid 30 can be easily opened by hooking the opening lid 36 with a finger and lifting the upper lid 30 upward.

  In the cap of the present invention shown in FIGS. 1 to 7 having such a basic structure, a taper in which the inner diameter of the cap increases toward the lower side of the engaging projection 11 of the inner wall portion 3a of the cap body skirt portion 3 as it goes downward. A plurality of upper ribs 12, 12 having a surface are formed at equal intervals over the entire circumference, and are formed below the breaking line 13, and the lower rib 14 is a tapered surface whose inner diameter increases as the inner surface goes downward. , 14 are formed, and the upper ribs 12 and 12 and the lower ribs 14 and 14 are formed at positions shifted from each other in the circumferential direction. That is, in the cap of the present invention, as will be described later, a tearable thin breaking line 13 extending in the circumferential direction is formed in order to enable separation and disposal, and the upper rib 12 is formed with this breaking line 13 as a boundary. Two types of ribs, that is, the lower rib 14 are formed.

The surfaces of the upper ribs 12 and 12 that are in contact with the container mouth are formed in a tapered shape that increases as the inner diameter of the cap goes downward. In the specific example shown in the figure, as is apparent from FIGS. 3 to 5, the lower end of the tapered surface 12a is located below the fracture line 13, and the tapered surface 12b rises from the lower end toward the position of the fracture line 13. Is formed.
On the other hand, the lower ribs 14, 14 extend in the vertical direction from the position of the breaking line 13, the surface in contact with the upper container mouth is formed as a vertical surface 14 a parallel to the axis, and the lower rib 14, 14 is located below the surface 14 b on the lower container mouth side. The cap is formed in a tapered shape in which the inner diameter of the cap increases as it goes to.
Therefore, as is apparent from FIGS. 3 to 5, the container mouth portion 50 is continuously connected from the tapered surface 14b of the lower rib 14 to the tapered surface 12a of the upper rib 12 and then to the lower tapered surface of the engaging projection 11 when plugging. Therefore, the engaging projection 11 can smoothly get over the engaging portion 51 of the container mouth and engage.

In the present invention, it is important that the upper rib 12 and the lower rib 14 are not formed at the same position in the circumferential direction of the cap. In other words, in the present invention, as described above, the upper rib and the lower rib are placed in positions shifted in the circumferential direction, so that the upper portion of the lower rib can be made to be the vertical surface 14a. Since the surface is torn at the vertical surface 14a, the torn end surface does not have an acute angle as compared with the one torn at the taper surface, and it is effectively prevented that the hand holding this portion becomes painful. In spite of the provision of the vertical surface 14a on the upper part of the lower rib, the cap surface can be smoothly plugged by the fact that the tapered surface of the upper rib and the tapered surface of the lower rib can continuously guide the container mouth. It becomes possible.
In particular, as shown in FIGS. 3 to 5, even when the stepped portion 52 based on the parting line at the time of forming the container is formed on the outer surface of the tip of the container mouth portion 50, the engaging protrusion 11 is formed by the guide of the rib. It is possible to smoothly get over the engaging portion 51 without being affected by the stepped portion.

  Further, in the cap of the present invention, as shown in FIGS. 1 to 6, when the upper rib and the lower rib are formed at the same position, the upper rib and the lower rib are made continuous in order to make the tapered surface continuous. However, it is difficult to form a thin broken line for separation and disposal, but by forming the thin broken line in this way, the container opening is secured while securing the thin broken line. Since the portion is continuously guided by the taper surfaces of the upper rib and the lower rib, smooth plugging becomes possible.

In the cap of the present invention, the cap can be easily removed from the container mouth after use of the contents, and has a separating property.
The cap shown in FIGS. 1 to 7 has the following characteristics in addition to the characteristics described above from the viewpoint of separation and disposal. That is, the outer wall portion 3b is formed with a first axial score 40 extending from the upper end to the lower end or the vicinity thereof in the vicinity of the one end portion of the hinge portion 31. In the vicinity of the end portion on the side, a short second axial score 41 extends downward from the upper end of the outer wall portion 3b, and the cap main body 1 after use of the contents after tearing the first axial score 40 is used. While performing the removal operation, the first axial score 40 is easily torn by the second axial score 41.

  In the cap of the present invention, as apparent from FIG. 7, the tear region X and the fixing region Y are formed in the skirt portion 3 of the cap body 1. The tear region X starts from the first axial score 40 formed on the outer wall portion 3b described above, passes through the hinge connecting portion 31 side with the upper lid 30, and is 1 / of the entire circumference of the skirt portion 3. It extends over 4 or more (310 degrees in the specific example shown in FIGS. 1 to 7), and the fixing region Y is formed over the region between the start point and the end point of the tear region X. In the tear region X, the slit 10 that divides the inner wall portion 3a and the outer wall portion 3b is formed deeply. For this reason, the connecting portion that connects the lower end portion of the inner wall portion 3a and the outer wall portion 3b. The portion is a thin wall (break line), and the outer wall 3b can be peeled off from the inner wall 3a. On the other hand, in the fixed region Y, the slit 10 that divides the inner wall portion 3a and the outer wall portion 3b is formed shallow, and the connecting portion that connects the lower end portion of the inner wall portion 3a and the outer wall portion 3b is a thick wall. Thus, the outer wall 3b is a region that is not peeled off from the inner wall 3a.

In the example of the cap of the present invention shown in FIGS. 1 to 7 in which the tear region X and the fixing region Y are formed, a portion A (a boundary portion between the tear region X and the fixing region Y) that is the starting point of the tear region X ), A first axial score 40 is formed on the outer wall 3b from the upper end to the lower end. In this portion A, the inner wall 3a and the outer wall 3b are separated.
That is, the work of removing the cap body 1 from the container mouth portion 50 starts by first holding the upper lid 30 and pulling it downward to tear the first axial score 40. In this case, a first axial score 40 is formed at one end of the hinge portion 31 of the upper lid 30, and a short second axial score 41 is formed at the other end of the hinge portion 31. Therefore, when the upper lid 30 is pulled down, the second axial score 41 is also torn simultaneously with the first axial score 40, so that the first axial score 40 can be easily torn.

  After tearing the first axial score 40, holding the torn outer wall 3b by hand and rolling it toward the tear region X side, the breaking line 13 between the inner wall 3a and the outer wall 3b. As a result, the outer wall 3b is peeled off from the inner wall 3a. In order to enable the tearing to be started easily, in the tear start portion B connected to the portion A, the slit 10 The skirt part 3 is penetrated, and also in this part B, the outer wall part 3b and the inner wall part 3a are separated (that is, the fracture line 13 is not formed). Therefore, when the first axial score 40 is torn to the lower end, the outer wall 3b at the tear start portion B is not constrained by the inner wall 3a. The outer wall 3b can be easily rolled in the circumferential direction with the upper lid held up, and the cap can be easily removed from the container mouth.

  When removing the cap from the container mouth in the manner described above, the outer wall 3b part where the lower ribs 14, 14 below the breaking line are formed is gripped to tear in the circumferential direction. In the cap of the present invention, since the upper part of the lower rib is a vertical plane parallel to the axis, the hand hits when gripped, and the hand does not hurt during tearing.

The cap of the present invention is not limited to the specific examples of FIGS. 1 to 7 described above, and various modifications are possible.
That is, in the specific example shown in the figure, the same number of upper and lower ribs are alternately provided on the inner surface of the skirt portion. These are not necessarily provided alternately or in the same number.
The basic structure of the cap can also be applied to various types of caps as long as it is a plastic cap that is applied to the container mouth by stoppering. In the specific examples shown in the figures, the cap was a hinge cap. However, it is of course possible that the upper lid is a screw cap that can be detached from the cap body.
In the specific example shown in the figure, in order to impart separation waste, the upper lid is pulled downward and then is torn in the circumferential direction. It may be in the shape of a cap having the following type of waste disposal.

  The cap of the present invention can be molded by a conventionally known method such as injection molding or compression molding using polyethylene, polypropylene, etc., which has been used in conventional plastic caps. For example, in the hinge cap shown in the figure Can be manufactured by integrally forming the cap body 1 and the upper lid 30 in a state where the upper lid is opened, and then forming the slit 10 by cutting.

It is side sectional drawing of an example of the state which applied the cap of this invention to the container opening part. It is a sectional side view in the state where the upper cover of the cap shown in FIG. 1 was opened. It is a partially expanded sectional view in the state before putting a cap on a container mouth part when stoppering the cap shown in FIG. It is a partially expanded sectional view in the state where the cap was put on the container mouth when the cap shown in FIG. It is a partially expanded sectional view which shows a state when the cap shown in FIG. 1 is stoppered and it begins to mount | wear with a container opening part. It is a partially expanded sectional view for demonstrating the state before and behind the fracture | rupture of the fracture | rupture line for classification disposal. It is a top view in the state where the upper cover of the cap shown in FIG. 1 was opened.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cap body, 2 Top plate part, 3 Skirt part, 4 Inner ring, 5 Score, 10 Slit, 11 Engagement protrusion, 12 Upper rib, 13 Break line, 14 Lower rib, 30 Upper lid, 31 Hinge part, 50 Container mouth part , 51 engaging portion, 52 stepped portion.

Claims (4)

A cap body having a top plate portion and a skirt portion, and an inner surface of the skirt portion formed with an engagement protrusion that engages with an engagement protrusion formed on the outer surface of the container mouth, and the top plate portion of the cap body is covered The container after use of the contents is formed by tearing a tearable thin tear line extending in the circumferential direction formed in the cap main body skirt portion below the engagement protrusion of the skirt portion, which is composed of an upper lid attached to the cap main body. In a plastic cap that can be easily removed from the mouth,
The inner surface of the skirt part is formed at the lower part of the engaging projection and has an upper rib which is a tapered surface whose inner diameter increases as the inner surface goes downward, and is formed below the breaking line and the inner diameter as the inner surface goes downward. A plastic cap excellent in sorting and disposal, wherein lower ribs, which are tapered surfaces, are formed, and a plurality of upper ribs and lower ribs are formed at positions shifted from each other in the circumferential direction.   2. The plastic cap according to claim 1, wherein the taper surface of the lower rib is formed only at the lower portion and the upper portion forms a vertical surface.   The plastic cap according to claim 1 or 2, wherein the upper rib and the lower rib are alternately formed over the entire circumference.   The cap body has a top plate portion having an opening portion for content extraction and a skirt portion lowered from the periphery of the top plate portion, and a container mouth portion is fitted and fixed inside the skirt portion, and the upper lid is The cap body is hingedly connected, and the skirt portion of the cap body includes an inner wall portion and an outer wall portion that extends below the inner wall portion and is located around the inner wall portion. The skirt portion is formed with a tearable tear region formed by the breaking line on the inner wall portion and the outer wall portion, and a fixing region that cannot be torn, and the tear region and the fixing region. Is formed in the outer wall portion with an axial weakening line extending in the axial direction from the upper end to the lower end, and the tear region is at least 1/4 of the entire circumference of the skirt portion. More In the tear region, the outer wall portion is a thin connecting portion in which the lower end portion of the inner wall portion can be torn by a slit extending deeply from the upper end to the thickness portion of the skirt portion. The fixed region is connected to the outer wall portion by a thick connecting portion in which the lower end portion of the inner wall portion cannot be torn by a slit that extends shallowly from the upper end to the thickness portion of the skirt portion. The plastic cap according to any one of claims 1 to 3, wherein the plastic cap is an area in which the inner wall portion and the outer wall portion are integrated with each other.

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