JP2009062091A - Plastic cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic cap having a spout tube, which can pour a content liquid smoothly with a constant liquid width even in case the degree of inclination of a container at the time of pouring the content liquid is more or less changed and which can adjust the liquid quantity easily. <P>SOLUTION: A bill portion 20 protruding obliquely outward is formed at the upper end portion of a spout tube 11 formed at a top plate portion 5 of a cap body 1. The lower end portion of the inner face of the spout tube 11 is a generally cylindrical seal face 17. A groove 30 extending from the upper end portion of the seal face 17 to the upper end of the bill portion 20 is formed in the inner face of the bill portion 20 of the spout tube 11. A seal ring 29 coming into close contact with the seal face 17 of the inner face of the spout tube 11 when the upper cover 2 is closed is formed on the inner face of an upper cover 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plastic cap in which a beak portion protruding outward is formed as a spout at the upper end of a pouring protrusion (for example, a pouring tube) serving as a guide for pouring out the liquid in the container.

  A plastic cap having a pouring protrusion such as a pouring cylinder serving as a guide for pouring the liquid in the container is widely used. A typical example of such a plastic cap with a pouring cylinder comprises, 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 cylinder is provided. That is, the cap body has a cylindrical side wall and a top plate part formed so as to close the upper end of the cylindrical side wall, and a pouring cylinder is formed on the upper surface of the top plate part, A portion of the top plate portion surrounded by the extraction cylinder is formed with a planned opening portion partitioned by an endless score. 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 surface of the dispensing cylinder. Thus, the content liquid is smoothly poured out without causing flow or scattering.

  In the pour tube as described above, generally, at least a part of the upper end thereof protrudes outward from the base portion of the pour tube and serves as a spout. Recently, it has been proposed to form a beak portion that protrudes outward at the upper end of the pouring tube, and to use such a beak portion as a spout. It is known that liquid breakage is improved by the formation of the beak part (see Patent Documents 1 and 2).

  In addition, a cap has also been proposed in which a part of the pouring cylinder is formed with a portion that is elongated outward from the lower end to the upper end, and the content liquid is poured through this part (see Patent Document 3).

JP 2003-40299 A JP 2004-352284 A JP 2007-131352 A

  However, although the plastic cap provided with the beak portion in the dispensing cylinder as in Patent Documents 1 and 2 is excellent in terms of liquid breakage, the degree of inclination of the container when pouring the content liquid is slightly Just by changing, the width of the liquid poured out from the beak portion varies, and as a result, the size (area) of the dropping portion of the poured liquid may vary greatly. In particular, when the size of the liquid drop part is small, there is not much problem, but when the liquid drop part size is large, the content liquid is dropped to unnecessary parts. May cause inconvenience.

  Further, as in Patent Document 3, in the cap in which the elongated protruding portion is formed on the dispensing cylinder, the content liquid is not poured out unless the container is largely inclined, and as a result, the content liquid is dispensed. It is not suitable to perform, and since the amount of liquid to be poured out is large, there is still a problem that the change in the inclination of the container is likely to cause fluctuations in the width of the liquid to be poured out, and the liquid cutting property cannot be expected so much. is there.

  In addition, in the caps of Patent Documents 1 to 3, the beak portion and the elongated protrusion function effectively when the content liquid dispensing capacity is constant, but cannot follow the change in the content liquid dispensing capacity, for example, When a small amount of liquid is poured out, it is designed so that the liquid can be smoothly poured out from the beak part, etc. Does not function effectively, and for example, the liquid is poured out from places other than the beak part, so that the liquid pouring becomes unstable or the liquid runs out. In addition, when a large volume of liquid is poured out, it is designed so that the liquid can be smoothly poured out from the beak portion or the like. However, there is a problem that the beak part and the elongated protrusion part must be formed larger than necessary. Therefore, there is still room for improvement considering the convenience of general consumers.

Accordingly, the object of the present invention is to allow the content liquid to be poured out smoothly and with a constant liquid width even when the degree of inclination of the container when the content liquid is poured out changes slightly. An object of the present invention is to provide a plastic cap having a pouring protrusion with good cutting performance.
Another object of the present invention is to dispense a liquid stably and smoothly even when a small amount of liquid and a large amount of liquid are poured out. It is providing the plastic cap provided with.

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 with a dispensing cylinder in which a dispensing projection serving as a guide for dispensing the liquid in the container is formed,
At the upper end portion of the pouring protrusion, a triangular beak portion is formed that protrudes outwardly and has a vertex at the center when viewed from the upper surface,
The lower end portion of the inner surface of the extraction protrusion is a sealing surface extending in the vertical direction,
A groove extending from the upper end portion of the seal surface to the upper end of the beak portion is formed on the inner surface of the beak portion of the extraction protrusion,
A plastic cap is provided in which an inner surface of the upper lid is formed with a sealing ring that comes into close contact with the sealing surface when the upper lid is closed.

In the present invention,
(1) The pouring protrusion has a cylindrical shape or an arc shape,
(2) The inner surface of the beak portion of the pouring protrusion is an inclined surface that is inclined outward from the upper end of the seal surface, and is a side cross-section at the circumferential center of the beak portion. The inclined surface is formed over at least half the height of the pouring protrusion,
(3) The opening or the planned opening portion is formed in a shape in which a portion facing the beak portion has a narrow extraction liquid throttling region,
(4) The groove formed on the inner surface of the beak portion has a width that is about the same as the extraction liquid throttling region of the opening or the planned opening portion,
(5) The groove formed on the inner surface of the beak portion, as viewed from above, has a large volume dispensing guide groove extending from the upper end portion of the seal surface to the upper end of the beak portion, and the large volume dispensing guide. At least one small-volume or medium-capacity extraction guide groove that is located inside the area-use groove and is narrower than the large-capacity extraction guide groove and extends from the upper end of the seal surface to the upper end of the beak Being formed,
(6) Inside the large volume dispensing guide groove portion of the groove, the medium volume dispensing guide is narrower than the large volume dispensing guide groove portion and extends from the upper end portion of the sealing surface to the upper end of the beak portion. A groove portion for guiding and a small-capacity dispensing guide groove that is narrower than the medium-capacity dispensing guide groove portion and extends from the upper end portion of the seal surface to the upper end of the beak portion,
(7) A concave portion whose center portion is most recessed is formed in a portion of the top plate portion inside the dispensing cylinder, and the opening or the opening planned portion is formed in the concave portion. A tapered tapered extraction channel is formed from the planned portion of the extraction liquid constriction region toward the base portion of the extraction cylinder, and the central portion of the groove is formed on the extension line of the extraction channel. Being located,
Is preferred.

  In the plastic cap of the present invention, it is important that a groove extending from the upper end portion of the seal surface to the upper end of the beak portion is formed on the inner surface of the beak portion protruding outward from the pouring protrusion. It is. That is, such a groove has an action of squeezing out the liquid to be poured out. For this reason, even when the degree of inclination of the container when the content liquid is poured out changes slightly, the content liquid can be poured out smoothly and with a constant liquid width, and adjustment of the content liquid pouring is possible. Can be easily performed. For example, even when the tilt of the container is slightly increased and the amount of liquid to be poured out increases, the liquid is squeezed by the groove, so that the width of the liquid poured out from the beak portion hardly fluctuates, The area at the drop point does not increase.

  In addition, the inner surface of the beak portion is an inclined surface that is inclined outward from the upper end of the substantially vertical seal surface, and the groove is formed on the inclined surface. The liquid can be poured out.

  Further, in the present invention, when a large capacity dispensing guide groove is formed in the groove, and a smaller small volume dispensing guide groove or medium capacity dispensing guide groove is formed inside the groove. In both cases of pouring a large volume of liquid by tilting the container large and pouring a small amount of liquid by tilting the container small, the liquid is smoothly poured out while suppressing fluctuations in the liquid width. I can do it.

The present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a plan view showing an example of a plastic cap of the present invention having a cylindrical-shaped dispensing protrusion, with an upper lid being opened,
2 is a sectional side view (AA sectional view) of the plastic cap of FIG.
FIG. 3 is a side sectional view showing the plastic cap of FIG. 1 with the upper lid closed.
FIG. 4 is a perspective view of the cap body in a state where the score is torn and the opening is formed in the top plate portion in the plastic cap of FIG.
FIG. 5 is an enlarged plan view showing a main part of the plastic cap of FIG.
FIG. 6 is an enlarged side cross-sectional view (BB cross-sectional view) of the beak portion of the pouring protrusion (pouring cylinder) shown in FIG.
FIG. 7 is an enlarged plan view showing another example of a beak portion that is a main part of the plastic cap of FIG.
FIG. 8 is a side cross-sectional view showing an example of the plastic cap of the present invention provided with an arc-shaped pouring protrusion, with the upper lid being opened.

  1 to 4, the cap includes a cap body 1 and an upper lid 2 hinged to the cap body 1, and a synthetic resin known per se, such as low-, medium- or High density polyethylene, linear low density polyethylene, isotactic polypropylene, ethylene-propylene copolymer, polybutene-1, ethylene-butene-1 copolymer, propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer Molded with the top lid 2 opened (see FIG. 2) by injection molding using olefin resin such as coalescence, polystyrene, styrene-butadiene copolymer, ABS resin, thermoplastic polyester, polyamide, etc. Is done.

  The cap body 1 has a top plate portion 5 and a skirt portion 6 that hangs down from the peripheral portion of the top plate portion 5, and the upper lid 2 is hinged to the upper end portion of the skirt portion 6. Specifically, the upper lid 2 is connected slightly below the upper end of the skirt portion 6 by a pair of hinge connection bands 7a, 7a provided at intervals in the circumferential direction, and further, the hinge connection band 7a, It is connected with the upper end of the skirt part 6 by the hinge connection part 7b provided between 7a. Thus, the top plate portion 5 of the cap body 1 is closed by the upper lid 2 by turning the upper lid 2 hinged to the skirt portion 6.

  A locking projection 8 is formed on the inner surface of the skirt portion 6 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 6. A ring 9 is formed. That is, a container mouth portion (not shown) is fitted into the space between the inner ring 9 and the skirt portion 6 and the engagement between the locking projection 8 and the outer surface of the container mouth portion allows the cap body 1 to It is firmly fixed to the container mouth.

  The skirt portion 6 is formed with a slit 10 extending downward from the upper end in the thickness portion, and the skirt portion 6 is partitioned into an inner wall 6a and an outer wall 6b by the slit 10. Further, as shown in FIGS. 2 and 3, the inner wall 6a and the outer wall 6b are connected at the lower end. Thus, by making the skirt part 6 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.

  On the upper surface of the top plate portion 5 of the cap body 1, a pouring cylinder (that is, a pouring protrusion) 11 serving as a guide for the liquid to be poured when the content liquid is poured is formed. As will be understood, in the inner portion of the dispensing cylinder 5, the top plate portion 5 is a concave portion that is recessed in a bowl shape. Further, as shown in FIG. 1, an endless score 12 for forming a dispensing opening is formed in the recess, and the inner surface of the endless score 12 is formed on the outer surface of the top plate portion 5. A score breaking tab ring 15 is provided via a support column 14 formed in the region to be. That is, by pulling up the tab ring 15, the score 12 is broken, and as shown in FIG. 4, an opening for pouring is formed in the top plate portion 5, and the container contents are formed through the pouring opening. The liquid is poured out.

  Therefore, the content liquid that has flowed out of the dispensing opening formed by breaking the score 12 is guided by the dispensing cylinder 11 and poured out along the inner surface thereof. In particular, as can be understood from FIGS. 2 and 3, the portion of the dispensing tube 11 that is hinged to the upper lid 2 is lowered, and the upper portion 11a of the lower portion is directed outward. Is inclined. This is to prevent the dispensing cylinder 11 from getting in the way when the upper lid 2 is closed.

  The lower end portion of the inner surface of the dispensing cylinder 11 is a flat and substantially upright seal surface 17 over the entire circumference. When the upper lid 2 is closed, a part of the upper lid 2 is formed on the seal surface 17. The seal 12 is secured after the score 12 is broken and the dispensing opening is formed.

  As shown in the plan view of FIG. 1 and the perspective view of FIG. 4, a part of the upper end portion is inclined outwardly on the portion opposite to the hinge connecting portion side of the extraction tube 11. A beak portion 20 that protrudes outward in a triangular shape is formed. The tip of the beak portion 20 (the most protruded upper end center portion 20a is located on the center line X of the cap passing through the hinge connecting portion 7b and is a vertex of the triangle. Below the inner surface of the beak portion 20 The portion (corresponding to the bottom portion of the triangle formed by the beak portion 20) is located at the upper end portion of the seal surface 17, and the inner surface of the beak portion 20 is inclined with the inclined surface 20b inclined upward from this portion. In this way, the beak part 20 projecting outward from the base part of the pouring cylinder 11 serves as a spout, and by pouring out the content liquid from this part, the content liquid can be smoothly poured out. It can be carried out.

  As shown in FIGS. 2 and 3, the beak portion 20 has a thin upper end and is curved outward in a trumpet shape. That is, in addition to the beak shape, by curving in a trumpet shape in this way, the adhesion of the liquid at this part is suppressed, the liquid drainage is improved, and the dripping at the end of pouring of the content liquid is effectively performed Can be prevented.

  Further, on the outer surface of the top plate portion 5, a small protrusion 21 for engagement with the upper lid 2 is formed on the further outer portion of the extraction tube 11.

  On the other hand, the upper lid 2 is formed of a top plate 25 and a cylindrical side wall 27 extending from the peripheral edge of the top plate 25, and a sealing ring 29 is formed on the inner surface of the top plate 25. That is, when the upper lid 2 is closed, the outer surface of the sealing ring 29 comes into close contact with the sealing surface 17 below the inner surface of the pouring cylinder 11, and after this, the pouring opening is formed by breaking the score 12. Sealability is ensured. Since the hinge connecting portion side portion 11a of the extraction tube 11 is short and inclined outward, the sealing ring 29 smoothly enters the extraction tube 11 when the upper lid 2 is closed. The seal surface 17 comes into close contact.

  Further, as shown in FIG. 3, the central portion of the top plate 25 of the upper lid 2 is a bulging portion 25a bulging in a dome shape. By forming such a bulging portion 25a, the inner surface of the top plate 25 surrounded by the sealing ring 29 from the inner surface of the sealing ring 29 can be formed into an arcuate surface having no corners. The content liquid adhering to the inner surface of the top plate 25 after breaking can be quickly returned to the container.

  Further, a flange 25b is formed on a portion of the top plate 25 opposite to the hinge connecting portion (the side where the beak portion 20 of the extraction tube 11 is located), thereby making it easy to open and close the upper lid 2. Be able to.

Small protrusions 27a are provided at appropriate intervals on the tip end side (the portion opposite to the hinge connecting portion 7b) of the lower end surface of the cylindrical side wall 27 of the upper lid 2. That is, when the content liquid is poured out, the poured-out liquid may adhere to the peripheral portion of the top surface of the top plate portion 5 of the cap body 1, particularly the portion opposite to the hinge connecting portion 7b. In such a case, when the upper lid 2 is closed, if the lower end surface of the cylindrical side wall 27 is in close contact with the peripheral portion of the upper surface of the top plate portion 5, the adhering liquid is repelled and the surroundings are Inconveniences such as contamination may occur. However, if the small protrusions 27a are formed as described above, it is possible to effectively avoid the attached liquid from being repelled.
An arc-shaped protrusion 27b for height adjustment is formed on the lower end surface of the cylindrical side wall 27 on the side of the hinge connecting portion 7b so as to avoid the inclination by forming the small protrusion 27a as described above.

  In addition, a concave portion 27 c is formed in a circumferential shape on the inner surface of the lower portion of the cylindrical side wall 27. That is, when the upper lid 2 is closed, the concave portion 27c is engaged with the small protrusion 21 formed on the outer surface of the top plate portion 5, and thereby the closed state of the upper lid 2 is maintained.

  5 and 6 showing an enlarged main part of the present invention with reference to the perspective view of FIG. 4, it is important that a groove 30 is formed on the inner surface of the beak part 20 of the dispensing cylinder 11. is there. The groove 30 extends from the upper end portion of the seal surface 17 described above to the upper end of the beak portion 20, and since such a groove 30 is formed, in the cap of the present invention, the liquid to be poured out is For example, when the content liquid is squeezed by the beak portion 20 and the container is tilted to pour out the content liquid, the width of the liquid to be poured out is kept constant even if the inclination of the container changes slightly. The area of the dropping point can be kept almost constant, and the inconvenience such as increasing the area of the dropping point of the liquid and soiling the surroundings can be effectively avoided, and the adjustment of the amount to be dispensed becomes easy.

  Further, the groove 30 is formed on the inclined surface 20b (inner surface of the beak portion 20) inclined outward from the upper end of the substantially vertical seal surface 17, so that the container is not inclined more than necessary. There is also an advantage that the content liquid can be poured out.

  In the present invention, the inner surface of the beak portion 20 in which the groove 30 is formed, that is, the inclined surface 20b extends over at least half of the height h of the dispensing tube 11 as shown in the side sectional view of FIG. It is suitable that it is formed. That is, if the area of the inclined surface 20b is short, there arises a disadvantage that the container needs to be largely inclined when the liquid is poured out. Further, the length of the groove 30 formed in the inclined surface 20b is shortened, and the drawing effect by the groove 30 is also halved.

  In addition, the inclination angle θ (see FIG. 6) of the inclined surface 20a is preferably set to a size of about 10 to 55 degrees in consideration of the liquid pouring property and the mold release property after cap molding. .

  In addition, referring to FIGS. 1 and 5, the planned opening portion (corresponding to the opening, indicated by Z in the figure) defined by the score 12 formed on the top plate portion 5 is on the side facing the beak portion 20. It is preferable that the portion has a shape having an extraction liquid throttling region Z1 having a small width, and the groove 30 preferably has a width w comparable to that of the extraction liquid throttling region Z1. That is, by forming such a poured liquid throttling region Z1, the throttling effect can be further enhanced because throttling of the poured liquid is performed from the opening formed by tearing the score 12 to the groove 30.

  Further, in the example shown in FIGS. 1 and 5, a planned opening portion (or opening) Z is formed by a score 12 in the bowl-shaped recess, and pouring toward the base portion of the pouring cylinder 11. The liquid squeezing region Z1 extends in a tapered shape, and this portion is a groove that is recessed from the other portions. Moreover, the leading end portion 20a of the beak portion 20 is formed on the extension line of the liquid squeezing region Z1. (Center of the groove 30) is located. Accordingly, when the container is tilted, a pouring channel is formed in a straight line from the pouring liquid throttling region Z1 to the tip portion 20a of the beak portion 20, and the liquid pouring and throttling of the container contents can be effectively performed. It can be carried out.

  Moreover, it is preferable to form this groove | channel 30 in multiple steps with reference to the partial enlarged plan view of FIG. 7 which shows the other example of this invention. That is, in FIG. 7, a groove 30b having a smaller width (hereinafter referred to as a groove portion for medium-capacity dispensing guide) is provided inside the largest groove 30a (hereinafter referred to as a large-capacity dispensing guide groove portion). A narrower groove portion 30c (hereinafter referred to as a small-capacity dispensing guide groove portion) is formed inside the intermediate volume dispensing guide groove portion 30b. These groove portions 30a to 30c are all , Extending from the upper end portion of the seal surface 17 to the upper end of the beak portion 20. As described above, the groove 30 has a multi-stage configuration, so that a general consumer can easily adjust the amount of the poured liquid. Specifically, when the container is greatly inclined, the liquid is poured out through the large-volume dispensing guide groove 30a having a large width. When the liquid is poured out through the dispensing guide groove 30b and the degree of inclination of the container is further reduced, the liquid is poured out through the narrowest small volume dispensing guide groove 30c. . That is, by looking at the width of the liquid poured out from the beak portion 20, a general consumer can adjust the amount of liquid poured out by adjusting the degree of inclination of the container.

  In the present invention described above, the beak portion 20 protrudes greatly outward, so that it is not shown, but a deformation correction rib as disclosed in JP-A-2004-352284 is provided on the inner surface of the upper lid 2. It is preferable to keep it. Since there is a possibility that the beak portion may be deformed when the mold is removed, the deformation of the beak portion 20 is corrected by the deformation correcting rib by closing the upper lid after the cap is formed.

  Moreover, in the specific example mentioned above, the opening plan part Z is formed with the score 12, and although the opening for extraction is formed by tearing the score 12, such a score 12 is not formed, but from the beginning. It is of course possible to form an opening for dispensing (that is, the state shown in FIG. 4).

  Further, although the upper lid 2 is hinged to the cap body 1, in the present invention, a predetermined groove 30 may be formed on the inner surface of the beak portion 20, so that the upper lid 2 is screw-fastened to the cap body 1. Those skilled in the art will readily understand that the present invention can be applied.

  Moreover, in the plastic cap shown in FIG. 1 described above, the one having a cylindrical shape as the dispensing protrusion, that is, the dispensing cylinder 11 is formed, but in the present invention, the dispensing protrusion is It is not limited to such a pouring cylinder 11 and may have an arc shape. FIG. 8 shows a side sectional view of a plastic cap in which a pouring protrusion having such an arc shape is formed.

  The basic structure of the cap of FIG. 8 is the same as the cap shown in FIGS. 1 to 4, and therefore the same reference numerals as in FIGS. 1 to 4 are used in FIG. 8.

  In the cap of the aspect of FIG. 8, a pouring protrusion 110 having an arc shape is formed instead of the pouring cylinder 11. That is, the pouring protrusion 110 is formed in an arc shape by cutting out a short portion of the pouring cylinder 11 on the hinge connecting portion 7 side. That is, since the content liquid is poured out from the portion opposite to the hinge connecting portion 7, a guide wall is not necessary in this portion, and therefore the upper lid 2 is closed by cutting out this portion. In this case, the pouring protrusion 110 is made not to get in the way.

  The beak portion 20 is formed in the circumferential center portion of the pouring protrusion 110 like the pouring tube 11, and the groove 30 described above is formed in the inner surface (inclined surface) 20 b of the beak portion 20. ing. That is, the beak portion 20 is located at a portion opposite to the hinge connecting portion 7b side, and the tip 20a of the beak portion 20 is located on a center line passing through the center of the hinge connecting portion 7b.

  As can be understood from FIG. 8, in the inner portion of the pouring protrusion 110, the top plate portion 5 is inclined so that the hinge connecting portion 7 b side is lowered. The lower end portion of the inner surface of the pouring protrusion 110 is a flat and substantially upright seal surface 17 over the entire area, and is a notch (i.e., the pouring protrusion 110) on the hinge connecting portion 7b side. In the region where is not cut and does not exist), the top plate portion 5 is formed with a surface dropped downward toward the endless score 12. The lower part of this surface is a tapered surface extending to the endless score 12, and the upper part following this tapered surface is a substantially upright seal surface 17a, and the seal surface 17a is a dispensing protrusion. It continues to the lower seal surface 17 of 110. That is, when the upper lid 2 is closed, the seal ring 29 of the upper lid 2 comes into close contact with the sealing surfaces 17 and 17a formed on the pouring protrusion 110 and the top plate portion 5, and the score 12 is broken to form the pouring opening. The sealing performance after being applied is ensured. Therefore, as shown in FIG. 8, the seal ring 29 formed on the upper lid 2 is formed with a long portion that is in close contact with the seal surface 17a.

Note that a vertical groove 40 is formed on the inner surface of the cylindrical side wall 27 of the upper lid 2 of the cap on the opposite side of the hinge connecting portion 7 (inside the portion where the flange 25b is formed) by thinning. Has been. By forming such a vertical groove 40, when the upper lid 2 is closed, the beak portion 20 of the pouring protrusion 110 does not come into contact with the inner surface of the cylindrical side wall 27 of the upper lid 2, and the upper lid 2 smoothly. Can be closed.
In addition, also in said cap, the shape of the area | region enclosed by the extraction | projection protrusion 110 of the top-plate part 5 can also be made into a structure as shown in FIG.

  In the present invention, even in the cap in which the above-described pouring protrusion 110 is formed, the above-described groove 30 is formed on the inner surface of the beak portion 20 to thereby pour out and squeeze the liquid in the container. Can be done effectively.

The top view which shows the example of the plastic cap of this invention provided with the extraction protrusion part of a cylindrical shape in the state by which the upper cover was open | released. The sectional side view (AA sectional view) of the plastic cap of FIG. FIG. 2 is a side sectional view showing the plastic cap of FIG. 1 in a state where an upper lid is closed. The perspective view which looked at the cap main body of the state in which the score was torn and the top plate part was opened in the plastic cap of FIG. 1 from diagonally upward. The top view which expands and shows the principal part of the plastic cap of FIG. The expanded side sectional view (BB sectional drawing) of the beak part of the extraction | pouring protrusion (extraction cylinder) shown by FIG. The top view which expands and shows the other example of the beak part which is the principal part of the plastic cap of FIG. The sectional side view which shows the example of the plastic cap of this invention provided with the extraction | projection protrusion part of an arc shape in the state by which the upper cover was open | released.

Explanation of symbols

1: Cap body 2: Upper lid 11: Dispensing cylinder 17: Sealing surface 20: Beak part 29: Sealing ring 30: Groove 30a: Groove part for large capacity dispensing guide 30b: Groove part for medium capacity dispensing guide 30c: Groove portion 110 for guiding a small volume of pouring 110: Arc-shaped pouring protrusion Z: Planned opening portion Z1: Extraction liquid throttling region

Claims (8)

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 portion to be opened for pouring the liquid in the container, and the upper portion of the top plate portion is poured into the outer portion of the opening or the portion to be opened. In a plastic cap with a pouring cylinder in which a pouring protrusion serving as a guide is formed,
At the upper end portion of the pouring protrusion, a triangular beak portion is formed that protrudes outwardly and has a vertex at the center when viewed from the upper surface,
The lower end portion of the inner surface of the extraction protrusion is a sealing surface extending in the vertical direction,
A groove extending from the upper end portion of the seal surface to the upper end of the beak portion is formed on the inner surface of the beak portion of the extraction protrusion,
A plastic cap, wherein a sealing ring is formed on an inner surface of the upper lid so as to be in close contact with the sealing surface when the upper lid is closed.   The plastic cap according to claim 1, wherein the extraction protrusion has a cylindrical shape or an arc shape.   An inner surface of the beak portion of the pouring protrusion is an inclined surface that is inclined outward from the upper end of the seal surface, and when viewed from a side cross-section at the circumferential center of the beak portion, The plastic cap according to claim 2, wherein the inclined surface is formed over a height of at least half of the pouring protrusion.   3. The plastic cap according to claim 2, wherein the opening or the planned opening portion is formed in a shape in which a portion on the side facing the beak portion has a narrow extraction liquid narrowing region.   5. The plastic cap according to claim 4, wherein the groove formed on the inner surface of the beak portion has a width that is approximately the same as the extraction liquid throttle region of the opening or the planned opening portion.   The groove formed on the inner surface of the beak portion, as viewed from above, has a large volume dispensing guide groove portion extending from the upper end portion of the seal surface to the upper end of the beak portion, and the large volume dispensing guide region groove portion. At least one small-volume or medium-volume dispensing guide groove that is smaller in width than the large-volume dispensing guide groove and extends from the upper end portion of the seal surface to the upper end of the beak portion is formed. The plastic cap according to claim 4.   Inside the large volume dispensing guide groove portion of the groove is a medium volume dispensing guide groove portion that is narrower than the large volume dispensing guide groove portion and extends from the upper end portion of the seal surface to the upper edge of the beak portion. And a small-capacity dispensing guide groove that is smaller in width than the medium-capacity dispensing guide groove and extends from the upper end portion of the seal surface to the upper end of the beak portion. Plastic cap.   A concave portion with the most concave portion is formed in the inner portion of the top plate portion from the dispensing tube, and the opening or the planned opening portion is formed in the concave portion. A taper-shaped taper-shaped discharge passage is formed from the extraction liquid constriction region toward the base portion of the extraction tube, and the central portion of the groove is positioned on the extension line of the extraction passage. The plastic cap according to any one of claims 4 to 6.

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