JP5702076B2 - Plastic cap - Google Patents

Description

  The present invention relates to a plastic cap, and more specifically, a beak portion protruding outward is formed as a spout at the upper end of a pouring projection serving as a guide for pouring the liquid in the container. The present invention relates to a cap with a protruding portion.

  A plastic cap provided with a pouring protrusion serving as a guide for pouring out the liquid in the container is widely used. A typical example of such a plastic cap with a pouring protrusion is, for example, a cap main body fixed to a container mouth portion and an upper lid hinged to the cap main body so as to be openable and closable. It has a structure in which a protrusion is provided. That is, the cap body has a cylindrical side wall and a top plate portion formed so as to close the upper end of the cylindrical side wall, and a pouring protrusion is formed on the top surface of the top plate portion. In the portion surrounded by the pouring protrusion of the top plate portion, a planned opening portion defined by an endless score is formed. An opening is formed by tearing the above-mentioned score of the cap body fixed to the container mouth, and when the liquid in the container is poured through this opening, the poured-out liquid flows along the wall of the pouring protrusion. Thus, the content liquid is smoothly poured out without causing flow or scattering.

  In the pouring protrusion as described above, generally, at least a part of the upper end of the pouring protrusion protrudes outward from the base portion of the pouring protrusion and forms a pouring spout. However, recently, it has been proposed to form a beak that protrudes outward at the upper end of the pouring protrusion, and to use such a beak as a spout. In addition, it is known that liquid breakage is improved by forming the beak portion (see Patent Documents 1 and 2).

However, as in Patent Documents 1 and 2, in the plastic cap provided with the beak portion on the pouring protrusion, when the upper lid is closed, the finger hits the sharp beak portion and gives the user an unpleasant feeling. There is a problem.
As a plastic cap in which this problem has been solved, a plastic cap is proposed in which a buffering protrusion protruding outward is provided on the outer surface of a pouring protrusion having a beak portion at the upper end (see Patent Document 3). .

JP 2003-40299 A JP 2004-352284 A JP 2010-36932 A

  However, the conventionally known cap provided with the beak portion proposed in Patent Documents 1 to 3 and the like is certainly closed in spite of the improved liquid drainage compared to the previous caps. When the upper lid is opened, there is a problem that the finger hits the beaked portion and gives the user an unpleasant feeling.

  Moreover, in the cap proposed by patent document 3, the discomfort given to a user is prevented when a beak part hits a finger | toe when opening an upper cover. However, in order to prevent the beak part from hitting the finger, a buffering protrusion is provided on the outer surface of the pouring protrusion and below the beak part. Therefore, there was a slight problem in moldability. In addition, depending on the content liquid, when returning to an upright state after pouring out, the content liquid may be turned around from the side surface of the pouring protrusion to the bottom surface and drooping along the outer surface of the pouring protrusion. There was a case of falling.

  Accordingly, the object of the present invention is to further improve the liquid cutting property, and has a stable liquid cutting property even when the liquid in the container is repeatedly poured out, and the beak portion is provided when the upper lid is opened. An object of the present invention is to provide a plastic cap that prevents discomfort given to the user by hitting the finger and is excellent in moldability and can be easily molded.

According to the present invention, the cap main body is fixed to the container mouth portion, and the upper lid is attached to the cap main body so as to be openable and closable. The cap main body includes a top plate portion and a skirt portion that is lowered from the peripheral portion of the top plate portion. The top plate portion is formed with an opening or a planned opening portion for pouring the liquid in the container, and on the top surface of the top plate portion, on the outer portion of the opening or the planned opening portion, In a plastic cap provided with a pouring protrusion that protrudes upward and serves as a guide for pouring the liquid in the container,
At the upper end of the pouring protrusion, a triangular beak portion is formed as a whole, protruding outward in the radial direction and having a vertex at the center when viewed from above, and is formed at a lower portion of the beak portion. Has an inclined wall that is inclined outward from below to above,
Sectional side view of the bill unit is in upright position of the plastic cap, as well as have the most protruding portion that protrudes most in the radially outward at a position lower than the upper end,
A surface extending upward from the most protruding portion is formed in a region above the most protruding portion, and the surface extending upward from the most protruding portion is tangent starting from the most protruding portion. When pulled, the angle of the tangent to the vertical axis is less than 45 degrees,
A downwardly convex curvature surface including the most protruding portion is formed in a region below the most protruding portion, and the outer surface of the beak portion is inclined by the inclined convex surface. To the top of the
The surface extending upward from the most protruding portion is a shift protruding portion that protrudes most outward in the radial direction in a region above the most protruding portion when the plastic cap is inclined by 45 degrees or more, and drops the liquid in the container. There is provided a plastic cap characterized by having a shape such that is formed.

In the present invention,
(1) The inclination angle of the outer surface of the inclined wall is gradually increased from both ends in the circumferential direction toward a portion located at the center of the beak portion,
Is preferred.

  In the plastic cap of the present invention, the side cross section of the beak portion formed at the upper end of the pouring protrusion is the most protruding portion that protrudes most radially outward at a position lower than the upper end in the upright state of the cap. When the cap is inclined 45 degrees, the region above the most protruding portion is formed so that the shift protruding portion that protrudes most radially outward is formed in the region above the most protruding portion. An inclined surface or a curved surface is formed on the surface. That is, when pouring the liquid in the container while tilting the container equipped with this cap, the content of the liquid poured through the beak portion is 45 ° or more at that time because the inclination angle of the container (cap) is 45 degrees or more. The liquid will drop downward at the shift protrusion separated from the outermost protrusion of the beak. As a result, it is possible to effectively prevent the inconvenience that the content liquid to be poured does not flow around to the back side of the most protruding portion, and the content liquid flows down along the outer surface of the pouring protrusion.

  In the present invention, the region below the most protruding portion has a downwardly convex curvature surface including the most protruding portion. As a result, even when the opener's finger hits the beaked portion when opening the cap, the portion that the finger hits becomes a curvature surface, so that discomfort given to the opener can be effectively prevented. That is, in the present invention, since it is not necessary to provide a buffering protrusion for preventing the finger of the unsealed person from hitting the beak part on the lower side of the beak part, a decrease in formability due to the formation of such a protrusion part. Is also effectively eliminated, and for example, it can be formed by forcibly using a normal mold.

The top view which shows the plastic cap of this invention in the state by which the upper cover was open | released. FIG. 2 is a side sectional view of the plastic cap of FIG. 1. FIG. 2 is a side sectional view showing the plastic cap of FIG. 1 in a state where an upper lid is closed. The side sectional view which expands and shows the beak part which is the principal part of the plastic cap of FIG. It is explanatory drawing for demonstrating the liquid cutting property of the plastic cap of FIG. 1, (a) expanded the side cross section of the beak part when inclining the cap 45 degree | times and pouring out the content liquid. It is a figure shown, (b) is a figure which expands and shows the side cross section of a beak part when a cap is returned to an erect state after pouring out of a content liquid. It is explanatory drawing for demonstrating the liquid cutting property of the plastic cap of a comparative example, (a) expands the side cross section of the beak part when the cap is inclined 45 degree | times and the content liquid is poured out. It is a figure shown, (b) is a figure which expands and shows the side cross section of a beak part when a cap is returned to an erect state after pouring out of a content liquid.

  1 to 4, the cap includes a cap body 1 and an upper lid 3 that is hinged to the cap body 1. Such caps are known per se, such as low-, medium- or high-density polyethylene, linear low-density polyethylene, isotactic polypropylene, ethylene-propylene copolymers, polybutene-1, ethylene-butene-1. Injection using olefin resin such as copolymer, propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, polystyrene, styrene-butadiene copolymer, ABS resin, thermoplastic polyester, polyamide, etc. Molding or the like is performed with the upper lid 3 being opened (see FIG. 2).

  The cap body 1 has a top plate portion 5 and a skirt portion 7 that hangs down from the peripheral portion of the top plate portion 5, and the upper lid 3 is hinged to the upper end portion of the skirt portion 7 via a hinge connecting portion 9. It is connected. The hinge connecting portion 9 includes a central band 9a connected to the upper end of the skirt portion 7 and a pair of auxiliary bands 9b located on both sides of the central band 9a and connected slightly below the upper end of the skirt portion 7. , 9b. In this way, the top plate portion 5 of the cap body 1 is closed by the upper lid 3 by turning the upper lid 3 hinged to the skirt portion 7.

  A rectangular shallow groove 9c extends to the vicinity of both ends of the central band 9a on the upper surface side of the central portion of the central band 9a. This groove 9c is provided in order to improve the ease of bending of the hinge. The reason why the groove 9c is formed not to reach both ends of the central band 9a is to prevent the band 9a from breaking even when the upper lid 3 is opened and closed many times.

  A locking projection 10 is formed on the inner surface of the skirt portion 7 of the cap body 1, and the inner peripheral portion of the inner surface of the top plate portion 5 extends downward with a gap from the skirt portion 7. A ring 11 is formed. That is, a container mouth portion (not shown) is fitted in the space between the inner ring 11 and the skirt portion 7, and the cap main body 1 is engaged by engagement between the locking projection 10 and the outer surface of the container mouth portion. It is firmly fixed to the container mouth.

  The skirt portion 7 is formed with a slit A extending downward from the upper end in the thickness portion, and the skirt portion 7 is partitioned into an inner wall 7a and an outer wall 7b by the slit A. As shown in FIG. 2, the inner wall 7a and the outer wall 7b are connected at the lower end. Thus, by making the skirt part 7 into a double wall structure, the cap can be easily removed from the container mouth part at the time of separating and discarding the cap.

  For example, as can be understood from FIGS. 1 and 3, the outer wall 7b is formed so that the score 13 extends in the axial direction in the vicinity of the hinge connecting portion 9 (auxiliary band 9b), and the upper lid 3 is pulled. The cap body 1 can be easily removed from the container by tearing down the score 13 and breaking the outer wall 7b.

  Further, on the outer surface of the outer wall 7b, a rib Z extending in the axial direction is formed in the vicinity of the score 13 (in the vicinity of the hinge connecting portion 9). The rib Z is used as a positioning member when the cap body 1 is fitted and fixed to the container mouth.

  On the top surface of the top plate portion 5 of the cap body 1, a pouring projection 15 is formed that protrudes upward and serves as a guide for the liquid to be poured out when the content liquid is poured out. Is formed with an annular small protrusion 17 for engagement with the upper lid 3.

  The pouring protrusion 15 is notched on the hinge connecting portion 9 side (see FIG. 1), and as can be understood from FIGS. 2 and 3, the top plate portion 5 is formed in the inner portion of the pouring protrusion 15. Is inclined such that the hinge connecting portion 9 side is lowered.

  Further, an endless score 19 for forming a dispensing opening is formed in the inner region of the dispensing protrusion 15. Further, a score breaking tab ring 21 is provided on the outer surface of the top plate portion 5 via a support column 20 formed in a region inside the endless score 19. That is, when the tab ring 21 is pulled up, the score 19 is broken and a dispensing opening is formed.

  Therefore, the content liquid flowing out from the dispensing opening formed by breaking the score 19 is guided by the dispensing protrusion 15 and poured out along the inner surface thereof. As described above, the pouring protrusion 15 is notched on the hinge connecting portion 9 side and is short. That is, since the content liquid is poured out from the portion opposite to the hinge connecting portion 9, no guide wall is required in this portion. When closing the, the pouring protrusion 15 does not get in the way.

  Further, the lower part of the inner surface of the pouring protrusion 15 is a flat and substantially upright seal surface 23 over the entire circumference (see in particular FIG. 2), and when the upper lid 3 is closed, the pouring protrusion A part of the upper lid 3 is in close contact with the seal surface 23 formed on the portion 15 and the top plate portion 5, and the sealing performance after the score 19 is broken and the dispensing opening is formed is ensured. .

  As can be understood from FIGS. 1 to 3, a part of the upper end portion protrudes outwardly from the portion of the pouring protrusion 15 opposite to the hinge connecting portion 9 side, and a triangular beak portion as viewed from above. 30 is formed. The apex portion 30 a of the beak portion 30 is located on the center line X of the cap that passes through the hinge connecting portion 9.

  Moreover, as shown in the partial enlarged view of FIG. 4, an inclined wall 31 that is inclined outward from the lower side to the upper side is formed on the lower portion of the inner surface of the beak portion 30. The beak portion 30 is located at the upper end of the inclined wall 31. An inner surface 31a of the inclined wall 31 is located at the upper end portion of the seal surface 23, and a groove 30b is provided on the upper end portion of the inclined surface 31a (the inner surface of the beak portion 30) so that the liquid poured out smoothly flows. Is formed. Further, the upper surface of the apex portion 30a of the beak portion 30 is lower than the other portions due to the formation of the groove 30b. By forming the beak portion 30 in this manner, the beak portion 30 that protrudes more outward than the base portion of the pouring protrusion 15 serves as a spout, and the content concentrates on the apex portion 30a. The liquid can be poured out smoothly.

  On the other hand, the upper lid 3 is formed of a top plate 40 and a cylindrical side wall 41 extending from the peripheral edge of the top plate 40, and a sealing ring 43 is formed on the inner surface of the top plate 40. That is, when the upper lid 3 is closed, the outer surface of the seal ring 43 is brought into close contact with the seal surface 23 below the inner surface of the pouring projection 15, and the close-up of the score 19 results in forming the pouring opening. Sealing performance is ensured. Since the portion of the pouring projection 15 on the side of the hinge connecting portion 9 is short, the sealing ring 43 smoothly enters the pouring projection 15 when the upper lid 3 is closed, and the seal surface 23 It will adhere.

  Moreover, as FIG.1 and FIG.3 shows, the center part of the top plate 40 of the upper cover 3 becomes the bulging part 40a which bulged in the dome shape. By forming such a bulging portion 40a, the inner surface of the top plate 40 surrounded by the sealing ring 43 from the inner surface of the sealing ring 43 can be a spherical surface without corners, and the score 19 is broken. The content liquid adhering to the inner surface of the top plate 40 can be quickly returned into the container.

  Further, a flange 45 is formed at the upper end of the top plate 40 on the part opposite to the hinge connecting part 9 (the side where the beak part 30 of the extraction protrusion 15 is located), thereby opening and closing the upper lid 3. The operation can be easily performed. This also makes it difficult for the finger of the hand to touch the tip 30 a of the beak portion 30 of the extraction protrusion 15 when opening the upper lid 3.

  Small protrusions 47 are provided at appropriate intervals on the tip end side (the portion opposite to the hinge connecting portion 9) of the lower end surface of the cylindrical side wall 41 of the upper lid 3. That is, when the content liquid is poured out, the poured liquid may adhere to the upper surface portion of the skirt portion of the cap body 1, particularly the portion on the opposite side of the hinge connecting portion 9. In such a case, if the lower end surface of the cylindrical side wall 41 is in close contact with the upper surface portion of the skirt portion when the upper lid 3 is closed, the adhering liquid is repelled and the surroundings are soiled. May cause inconvenience. However, if the small protrusions 47 are formed as described above, it is possible to effectively avoid the attached liquid from being repelled.

  Note that an arc-shaped protrusion 49 for height adjustment for avoiding the inclination due to the formation of the small protrusion 47 as described above is formed on the hinge connecting portion 9 side of the lower end surface of the cylindrical side wall 41.

  Further, a convex portion 50 is formed on the inner surface of the lower portion of the cylindrical side wall 41 in a circumferential shape. That is, when the upper lid 3 is closed, the convex portion 50 engages with the small protrusion 17 formed on the outer surface of the top plate portion 5, whereby the closed state of the upper lid 3 is maintained.

  Further, on the inner surface of the cylindrical side wall 41, a groove 51 is formed by thinning in a portion opposite to the hinge connecting portion 9, that is, a portion where the flange 45 is formed on the top plate 40. Yes. By forming such a groove 51, when the upper lid 3 is closed, the tip 30a of the beak portion 30 formed on the pouring protrusion 15 is brought into contact with the inner surface of the cylindrical side wall 41 of the upper lid 3. The upper lid 3 is smoothly closed.

In the plastic cap having the structure described above, in the present invention, the shape of the beak portion 30 is different from that conventionally known, and this shape has a novel feature.
That is, referring to FIG. 4 showing an enlarged side cross-section of the tip portion (vertex portion 30a) of the beak portion 30, the beak portion 30 is located at a position lower than its upper end in the upright state of the cap. When the tangent line S is drawn from the most projecting portion 60, the tangent line S is drawn with respect to the surface 61 extending upward from the most projecting portion 60. The angle α with respect to the vertical axis of S is less than 45 degrees. Further, a surface extending downward from the most projecting portion 60 is a downwardly convex curvature surface 63, and the outer surface of the beak portion 30 is continuous with the upper end of the inclined wall 31 through the curvature surface 63. . Therefore, by forming such a curvature surface 63, a lowermost end portion 65 is formed below the most projecting portion 60, and the uppermost portion of the inclined wall 31 and the uppermost portion are disposed radially inward of the lowermost end portion 65. A recess 67 is formed between the lower end portion 65 and the lower end portion 65.

  In the present invention, as a result of the beak portion 30 having the shape as described above, liquid drainage when the liquid in the container is poured out is further enhanced, and when opening the upper lid 3, However, the discomfort given to the user by contacting the beak portion 30 is effectively alleviated.

  That is, when the content liquid is poured out by tilting the container equipped with this cap, the inclination angle (angle with respect to the horizontal line) varies depending on the amount of the liquid in the container, and the liquid is poured out. As the angle decreases, the inclination angle increases, and the container is tilted greatly to pour out the content liquid. Therefore, the inclination angle in the initial state where the content liquid is not poured out is the smallest and is about 45 degrees.

  However, referring to FIG. 5, when the content liquid is poured out by tilting the cap of the present invention having the beak portion 30 having the above-described shape at 45 degrees, the beak portion 30 is radially out of the radial direction. As shown in FIG. 5 (a), the portion that protrudes most in the direction shifts from the position of the most protruding portion 60 to the portion indicated by 70 (shift protruding portion). That is, the shift projecting portion 70 is a position that protrudes most outward in the radial direction of the beak portion 30 when the container is tilted during pouring, and the position shifts according to the angle at which the container is tilted. . Therefore, the poured content liquid 80 is dropped downward from the shift protrusion 70. When the cap (container) is returned to the upright state after pouring out the content liquid in this way, the liquid content liquid 80 remaining on the upper surface of the beak portion 30 is as shown in FIG. Then, it flows to the lowest end portion 65 along the most protruding portion 60 and falls from the lowest end portion 65.

As understood from the above description, in the cap of the present invention, when the content liquid 80 is poured by tilting the cap by 45 degrees, the content liquid 80 drops from the shift protrusion 70 that is farthest from the most protrusion 60. For this reason, the content liquid 80 does not turn back to the back side of the beak portion 30 (that is, the concave portion 67). For example, even when the content liquid 80 is returned to the upright state, the content liquid 80 is quickly discharged from the lowermost end portion 65. In any case, the inconvenience that the content liquid 80 flows down along the outer surface of the pouring protrusion 15 (the outer surface 31b of the inclined wall 31) is effectively prevented. In addition, since the back of the beak portion 30 of the content liquid 80 is effectively prevented, the content liquid 80 is along the outer surface of the pouring protrusion 15 even when the pouring operation of the content liquid 80 is repeated. There will be no inconvenience of running down.
Further, as the amount of the content liquid remaining in the container decreases, the inclination angle of the cap for pouring out further increases, but as this inclination increases, the position of the shift protrusion 70 when the cap is inclined becomes larger. Since the shift is made to the upper position away from the most protruding portion, the back of the content liquid 80 is increasingly prevented.
Therefore, in the present invention, the liquid is stably discharged from the initial state in which the container is filled with the content liquid to the last stage when the amount of the content liquid becomes small.

  On the other hand, as shown in FIG. 6, the inclination angle α at the tangent line S at the most projecting portion 60 is 45 degrees or more, and the curvature surface 63 protrudes downward below the most projecting portion 60. In the cap of the comparative example in which is not formed, even when the cap is tilted by 45 degrees, the position of the most protruding portion 60 does not shift, the shifting protruding portion is not formed, and adjacent to the most protruding portion 60. The back surface of the beak portion 30 exists. Therefore, when the content liquid is poured by tilting the cap by 45 degrees, the content liquid 80 falls from the most projecting portion 60 (see FIG. 6A). And the inconvenience that the content liquid 80 flows down along the outer surface of the pouring protrusion 15 is likely to occur. Even if the content liquid 80 does not flow down along the outer surface of the pouring protrusion 15, the content liquid 80 remains attached to the back surface of the beak portion 30. Accordingly, even when the cap is returned to the upright state after the content liquid 80 is poured out, the remaining content liquid 80 also falls from the most protruding portion 60, so that the content liquid 80 adhering to the back side of the beak portion 30 is removed. It becomes priming water, making it easier to create a backside. As a result, even if liquid drainage is good in the initial stage, if the pouring operation of the content liquid 80 is repeated, the amount of liquid adhering to the back side of the beak portion 30 will increase. This causes a disadvantage that 80 flows down along the outer surface of the pouring protrusion 15.

  As can be understood from the above description, the cap of the present invention exhibits excellent liquidity, but the region below the most projecting portion 60 is a downwardly convex curvature surface 63, and thus the upper lid 3. Even when the opener's finger hits the beak portion 30 when opening the file, since the portion to be touched becomes the curvature surface 63, the discomfort given to the opener is effectively alleviated.

  In the present invention described above, the liquid breakability when the content liquid is poured out increases as the position of the shift projecting portion 70 formed when the cap is tilted 45 degrees is further away from the most projecting portion 60 in the radial direction. Accordingly, the distance d (see FIG. 5A) between the most protruding portion 60 and the shift protruding portion 70 is 1 mm or more, particularly 2 mm or more, and most preferably 3 mm or more. It is preferable to set the inclination angle α of the tangent S. Of course, as long as the magnitude of such an inclination angle α is ensured, the surface 61 extending upward from the most protruding portion 60 may be a flat inclined surface or a curved surface.

  Moreover, in this invention, the outer surface of the extraction | projection protrusion 15 is a flat surface in the lower part of the beak part 30, and the protrusion part and the recessed part are not formed at all. Therefore, it is possible to perform die cutting after molding without using a split mold having a complicated structure, and extremely excellent moldability.

  In the present invention, the inclined wall 31 of the pouring protrusion 15 below the portion where the beak portion 30 is formed has an inclination angle θ of the outer surface 31b so that the center of the beak portion 30 from both ends in the circumferential direction. It is preferable that it gradually increases toward the portion located at (30a). In this way, by forming the inclined wall 31 so that the inclination angle θ changes, even when the beak portion 30 protrudes greatly outward in the radial direction, it is possible to smoothly perform die cutting after forming. Can do.

  The cap of the present invention described above can be effectively used as a cap of a container filled with various beverages, seasoning liquids such as soy sauce, and the like.

1: Cap body 3: Upper lid 15: Extraction protrusion 30: Beak part 60: Most protruding part 63: Curved convex surface 70: Shift protruding part

Claims (2)

A cap body fixed to the container mouth portion and an upper lid that can be opened and closed to the cap body. The cap body includes a top plate portion and a skirt portion that descends from the peripheral portion of the top plate portion. The top plate portion is formed with an opening or a planned opening portion for pouring the liquid in the container, and the upper surface of the top plate portion projects upward from the outer portion of the opening or the planned opening portion. In a plastic cap provided with a pouring protrusion that serves as a liquid pouring guide,
At the upper end of the pouring protrusion, a triangular beak portion is formed as a whole, protruding outward in the radial direction and having a vertex at the center when viewed from above, and is formed at a lower portion of the beak portion. Has an inclined wall that is inclined outward from below to above,
Sectional side view of the bill unit is in upright position of the plastic cap, as well as have the most protruding portion that protrudes most in the radially outward at a position lower than the upper end,
A surface extending upward from the most protruding portion is formed in a region above the most protruding portion, and the surface extending upward from the most protruding portion is tangent starting from the most protruding portion. When pulled, the angle with respect to the vertical axis of the tangent is less than 45 degrees, and in the region below the most protruding portion, a downward convex curvature surface including the most protruding portion is formed, The outer surface of the beak portion is continuous with the upper end of the inclined wall through the downwardly convex curvature surface,
The surface extending upward from the most protruding portion is a shift protruding portion that protrudes most outward in the radial direction in a region above the most protruding portion when the plastic cap is inclined by 45 degrees or more, and drops the liquid in the container. A plastic cap characterized by having a shape such that is formed.   2. The plastic cap according to claim 1, wherein the inclination angle of the outer surface of the inclined wall gradually increases from both ends in the circumferential direction toward a portion located at the center of the beak portion.

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