JP5854189B2 - Pouring cap - Google Patents

Description

  The present invention relates to a pouring cap that is attached to a mouth portion of a container and that forms a spout by opening a closed wall from an annularly formed score.

  Conventionally, the extraction cap of patent document 1 is known. This pouring cap is formed of resin, and an annular narrow groove (score) is formed in a sealing barrier (closing wall) formed inside a base (mounting portion) mounted on the mouth portion of the container. At the same time, a pull ring is formed at the tip of the support column protruding from the peripheral portion of the area (scheduled opening part) surrounded by the narrow groove of the sealing barrier. In the pouring cap having such a structure, by pulling the pull ring and pulling up the sealing barrier through the support column, the sealing barrier is broken from the annular narrow groove (score), and the narrow groove A spout corresponding to the enclosed area is formed.

JP 2006-206133 A

  By the way, in the resin pouring cap as described above, it is preferable in terms of easiness of opening that the strength at the time of breaking from the score of the hermetic barrier, so-called opening strength, is not higher than necessary. In particular, in the case of a pouring cap attached to a container filled with contents having a relatively high temperature, heat resistance resin having a relatively high hardness tends to be used and the opening strength tends to be high. It is important to make it easy to open as low as possible.

  In addition, when a pouring cap having the above-described structure is manufactured by pouring resin into a mold such as injection molding, the portion where the score of the sealing barrier (closing wall) is formed is thin and the resin The flow is sensitive to the shape of the score. If the resin flow is not smooth, molding defects such as pinholes may occur in the portion where the score is formed.

  This invention is made | formed in view of such a situation, and provides the pouring cap of the structure which can prevent the molding defect by resin as much as possible while being able to make opening strength comparatively low.

The pouring cap according to the present invention has a mounting portion to be mounted on the mouth portion of the container, and a closing wall formed inside the mounting portion, and has a score that defines a planned opening portion on the lower surface of the closing wall. A resin-made pouring cap formed and formed with a pulling portion that protrudes from a predetermined site in the vicinity of the score of the planned opening portion, and the resin gate portion position at the time of injection molding with resin is set in the planned opening portion The score inner surface includes a first inclined surface inclined upward, a second inclined surface inclined more slowly than the first inclined surface, following the first inclined surface, and the second inclined surface A score-opposing surface that is a surface opposite to the surface on which the score is formed of the closed wall, the surface including a first inclined surface and a third inclined surface inclined in a direction opposite to the second inclined surface. The distance between the second inclined surface and the third inclined surface with respect to the Configuration and become that.

  In the dispensing cap according to the present invention, the second inclined surface may be shorter than the first inclined surface.

  In the dispensing cap according to the present invention, the angle α of the first inclined surface with respect to the closing wall is 30 ° to 60 °, the angle β of the second inclined surface is 5 ° to 45 °, and each angle α And β can be configured such that α> β.

  Moreover, the extraction cap which concerns on this invention WHEREIN: The part following the said 1st inclined surface of the said score inner surface can be set as the structure curved in convex shape.

  Furthermore, the pouring cap according to the present invention may be configured such that a thick part is formed at the base of the pulling part.

Further, the pouring cap according the present invention, the thick portion may be configured to be the resin gate portion placed al approximately fanned shape.

Moreover, the pouring cap which concerns on this invention WHEREIN: The said thick part can be set as the structure which spreads in the substantially fan shape whose angle (theta) which makes the said resin gate part position the central angle is 15 degrees-45 degrees.

  Furthermore, the pouring cap according to the present invention includes a lid body that is connected to the mounting portion via a hinge portion and that can be attached to and detached from the mounting portion by an opening / closing operation using the hinge portion as a fulcrum. be able to.

  According to the pouring cap according to the present invention, it becomes easy to open from the joint portion between the second inclined surface and the third inclined surface of the score inner surface where the distance from the core facing surface is minimized, and after the score opening. Since the formation of burr-like fracture fragments that are likely to be formed at the edge of the score opening is reduced, it is possible to prevent the appearance after opening of the score from being reduced, the remaining content from being reduced, and the pouring in the wrong direction. Further, since the resin flowing along the inner surface of the score can pass over the portion where the distance to the score-opposing surface is minimized relatively smoothly, it is possible to prevent molding defects due to the resin as much as possible. .

  Further, according to the dispensing cap according to the present invention, by selecting the length of the second inclined surface of the score inner surface and the angle between the first inclined surface and the second inclined surface within an appropriate range, the above-described score inner surface is obtained. Ease of opening from the joint between the second inclined surface and the third inclined surface, improvement in appearance after opening in the score, reduction of remaining contents, prevention of pouring in the wrong direction, prevention of molding defects be able to.

  Moreover, according to the pouring cap according to the present invention, when the closed wall is formed by the resin from the resin gate portion by forming a convex curve in the portion continuing below the first inclined surface of the score inner surface. Since the resin smoothly flows into the part corresponding to the first inclined surface of the score inner surface, it prevents the resin pool that tends to occur in the convexly curved part and prevents molding defects such as peeling that tends to occur on the resin pool surface layer. can do.

  Further, according to the pouring cap according to the present invention, by forming the thick part at the base of the pulling part protruding from the predetermined part in the vicinity of the score, in order to form the thick part from the resin gate part, A large amount of resin flows to form a portion between the pulling portion and the score inner surface and the score facing surface of the closing wall, and molding defects can be similarly prevented.

  Further, according to the pouring cap according to the present invention, by making the shape of the thick portion substantially fan-shaped from the position of the resin gate portion, it is relatively close to the shape in which the resin flows from the resin gate portion while gradually spreading. The thick part is smoothly formed, and it is possible to prevent the occurrence of a pinhole or the like that is likely to occur in the vicinity of the score at the base of the support column that is a part of the structure of the pulling part. Further, by forming a shape in which the angle θ with the resin gate portion of the thick wall portion as a central angle spreads in a substantially fan shape of 15 ° to 45 °, between the score inner surface and the score facing surface of the tension portion and the closing wall The resin can be easily flowed selectively to the portion.

  Furthermore, the pouring cap according to the present invention has a lid that is connected to the mounting portion via a hinge portion and can be attached to and detached from the mounting portion by an opening and closing operation using the hinge portion as a fulcrum. As described above, the resin can be easily flowed into the hinge portion and the lid body by selectively facilitating the flow of the resin to the portion between the tension portion and the score inner surface of the closing wall and the facing surface, so that the molding is poor. Therefore, the dispensing cap can be opened and closed very easily.

It is a top view which shows the structure of the extraction | pouring cap which concerns on one Embodiment of this invention. It is sectional drawing in the AA line in FIG. 1A. It is a top view which shows the structure of the back surface side of the extraction | pouring cap shown to FIG. 1A. It is sectional drawing in the BB line in FIG. 1C. It is an expanded sectional view which shows the detailed structure of the area | region E in FIG. 1B. It is an expanded sectional view showing the modification of the structure of field E in Drawing 1B in detail.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A dispensing cap according to an embodiment of the present invention is configured as shown in FIGS. 1A to 1C. 1A is a plan view of the dispensing cap, FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a plan view of the back surface side of the dispensing cap.

  1A to 1C, the pouring cap 1 is made by resin injection molding or the like, and has a structure in which a cap body 10 and a lid 20 are connected by a hinge portion 15. The cap body 10 has a structure in which a cylindrical mounting portion 11 and a pouring portion 12 are formed concentrically, and has a curved dish shape with a concave central portion so as to close the pouring portion 12. A closing wall 13 is formed. The mounting portion 11 is formed with an annular fitting portion (undercut portion) 11a. The fitting portion 11a is fitted into the mouth portion of the container, and the dispensing cap 1 is attached to the mouth portion of the container. The Further, a score (thin groove) 131 that defines the planned opening portion 130 corresponding to the spout is formed on the lower surface of the closed wall 13 (the surface facing the inside of the container). A support column 14a is formed on the upper surface of the closed wall 13 so as to protrude from a predetermined portion in the vicinity of the score 131 of the planned opening portion 130 defined by the score 131. At the upper end of the support column 14a, together with the support column 14a A ring-shaped pull ring 14b constituting the pulling portion 14 is formed.

  A lid 20 connected by a hinge 15 is formed on the outer peripheral surface portion of the mounting portion 11 facing the support column 14a. The lid 20 is attached to the mounting portion 11 by an opening / closing operation using the hinge portion 15 as a fulcrum. On the other hand, it is removable. Further, a cylindrical plug 21 is formed on the inner surface of the lid 20 at a position where the pouring part 12 is closed in a state where the lid 20 is joined to the mounting part 11.

When manufacturing such a pouring cap 1, the resin gate portion position (injection gate position) _PIN during injection molding with resin is set at the center in the opening planned portion 130 of the upper surface of the closing wall 13 or in the vicinity thereof. Has been. And by resin being injected from this resin gate part position _PIN , it is injection-molded in the direction away from the resin gate part position _PIN sequentially from the center of the upper surface of the closing wall 13 (opening scheduled part 130), The dispensing cap 1 is formed.

A thick portion 132 (see FIG. 1C) is formed in the planned opening portion 130 of the closing wall 13 from the resin gate portion position P _IN to the base of the support column 14 a on which the pull ring 14 b is formed. As shown in FIGS. 1C and 1D, the thick wall portion 132 has an angle θ range with the resin gate portion position _PIN as the central angle on the score forming surface on which the score 131 is formed on the lower surface of the closed wall 13. It has a shape that spreads out in a substantially fan shape. As shown in FIG. 1D, a linear surface range on the lower surface of the closing wall 13 is defined as an angle θ range, and the angle θ is set within a range of 15 ° to 45 °.

  FIG. 2 shows the detailed shape of the score 131 and is a diagram showing in detail the region E including the score 131 in FIG.

In FIG. 2, the inner surface of the score 131 is, in order, in a direction C away from the resin gate portion position P _IN , a linear first inclined surface 131a, a linear second inclined surface 131b, and a linear third inclined surface 131c. Are configured to be continuous. The length of the second inclined surface 131b is smaller than the length of the first inclined surface 131 and the third inclined surface 131c, and is minimized. The first inclined surface 131a is an inclined surface inclined upward, and has an inclination angle α in a range of 30 ° to 60 ° with respect to a horizontal plane parallel to the closing wall 13. The second inclined surface 131b following the first inclined surface 131a is an inclined surface inclined more gently than the first inclined surface 131a, and is inclined by 5 ° to 45 ° with respect to a horizontal plane parallel to the closing wall 13. A range inclination angle β is obtained. The relationship between the angle α of the first inclined surface and the angle β of the second inclined surface is such that the angle α> the angle β. Further, the third inclined surface 131c inclined downward from the second inclined surface 131b is an inclined surface inclined in the opposite direction to the first inclined surface 131a and the second inclined surface 131b. Of these inclined surfaces, the joint portion L _P (shown as a point in FIG. 2) between the second inclined surface 131b and the third inclined surface 131c has the smallest distance from the score facing surface 13a. . Further, the change in the thickness D2 in the direction C away from the resin gate portion position _PIN of the portion of the closing wall 13 corresponding to the second inclined surface 131b is the resin gate of the portion of the closing wall 13 corresponding to the first inclined surface 131a. It is gentler than the change in the thickness D1 in the direction C away from the part position _PIN .

Furthermore, in the direction C away from the resin gate portion position _PIN of the score forming surface of the score 131 of the closed wall 13 (closer to the resin gate portion position _PIN ), the resin gate portion position _PIN moves to the first inclined surface 131a of the score 131. The subsequent portion is a curved surface 133 curved in a convex shape.

In the pouring cap 1 having such a structure, the score 131 composed of the first inclined surface 131a, the second inclined surface 131b, and the third inclined surface 131c arranged in a direction away from the resin gate portion position _PIN . and the inner surface, rather than the face of the distance is minimum between the score opposing surface 13a of the closure wall 13, the joint portion L _P line between the second inclined surface 131b and the third inclined surface 131c. For this reason, the opening of the planned opening portion 130 made of the score 131 of the closing wall 13 performed through the support pillar 14a by the pulling of the pull ring 14b makes the distance from the score facing surface 13a the second inclined surface 131b. Once easily performed from the joint L _P between the third inclined surface 131c. Therefore, the opening strength necessary for cutting the planned opening portion 130 along the score 131 is reduced, and all portions of the score 131 are cut off, and the pouring corresponding to the planned opening portion 130 is formed on the closing wall 13 of the pouring portion 12. The operation for forming the mouth (opening) becomes easier. In addition, since the formation of burr-like fracture fragments that are likely to be formed at the edge of the opening after opening the score 131 is reduced, the appearance after opening in the score is improved, and the contents remain in the burr-like fracture fragment It is possible to prevent the contents from being poured out in the wrong direction, which is different from the planned dispensing direction, based on the burr-like broken pieces.

Further, in the portion of the closing wall 13 corresponding to the inner surface of the score 131 composed of the first inclined surface 131a, the second inclined surface 131b, and the third inclined surface 131c, the resin of the portion of the closing wall 13 corresponding to the second inclined surface 131b. change in thickness D2 in the direction C away from the gate portion position P _iN is the gradual than the change in the thickness D1 in the direction C away from the resin gate portion position P _iN of the portion of the closure wall 13 corresponding to the first inclined surface Therefore, the flow path of the resin poured into the mold changes so as to be relatively gently narrow at the second inclined surface 131b portion of the inner surface of the score 131, and the portion where the distance from the score facing surface 13a is minimized ( The second inclined surface 131b, the third inclined surface 131c, and the joint portion L _P ) are reached. For this reason, the flowing resin can pass over the portion where the distance from the score facing surface 13a is the minimum (joint portion L _P between the second inclined surface 131b and the third inclined surface 131c) relatively smoothly. Become. Accordingly, it is possible to prevent molding defects due to the resin, such as generation of pinholes.

  Further, in the dispensing cap 1, the length of the second inclined surface 131b on the inner surface of the score 131 is smaller than the length of the substitute inclined surface 131a and the third inclined surface 131c, and the length thereof is the minimum. This facilitates opening from the joint between the second inclined surface and the third inclined surface of the inner surface of the score 131, improves the appearance after opening in the score, prevents the contents from remaining in the burr-like broken pieces, It is possible to prevent the contents from being poured out in a wrong direction, which is different from the planned direction of dispensing, with the broken piece as the starting point, and to further prevent molding defects.

  Furthermore, the first inclined surface 131a inclined above the inner surface of the score 131 has an inclination angle α in the range of 30 ° to 60 ° with respect to the horizontal plane parallel to the closed wall 13, and the first inclined surface 131a following the first inclined surface 131a. The angle of the second inclined surface 131b, which is gentler than the inclined surface 131a and inclined upward, has an inclination angle β in the range of 5 ° to 45 ° with respect to a horizontal plane parallel to the closing wall 13, and the first inclined surface Since the relationship between the angle α of the surface and the angle β of the second inclined surface is such that the angle α> β, the opening from the joint between the second inclined surface and the third inclined surface of the inner surface of the score 131 is easy. To improve the appearance after opening in the score, prevent the contents from remaining on the burr-like fractured piece, and the content is poured out in the wrong direction from the burr-like broken piece as a starting point. Can be prevented and molding defects can be further prevented.

Further, the portion following the first inclined surface 131a of the score 131 in the direction C away from the resin gate portion position _PIN of the score forming surface of the closed wall 13 is a curved surface 133 that is curved in a convex shape. When the injected resin forms the closed wall 13, a resin pool that is likely to occur in the portion cannot be formed, and the first inclined surface 131 a on the inner surface of the score 131 can be more smoothly passed through the curved portion corresponding to the curved surface 133. Since it flows into the corresponding part, it becomes possible to further prevent molding defects such as peeling that easily occur on the resin surface layer.

In addition, since the thick wall portion 132 is formed on the closing wall 13 from the resin gate position _PIN to the score forming surface at the base of the support column 14a of the pull ring 14b, a relatively large amount of resin is applied to the injection mold. Since it is injected to form a thick wall portion 132 and flow to form a portion between the tension portion 14 and the score 131 inner surface of the closing wall 13 and the score facing surface 13a, molding defects due to resin are prevented. be able to. For this reason, generation | occurrence | production of the pinhole which tends to occur near the base score of the support pillar 14a can be prevented.

Further, the thickness shapes of the wall portion 132, so are substantially fan shape that extends sequentially resin from the resin gate portion position P _IN, the thick portion 132 Gayori smooth by the resin flowing from the resin gate portion position P _IN Formed. As shown in FIG. 1C, when the thick wall portion 132 is formed on the same surface as the score forming surface, the finger can be smoothly inserted into the pull ring 14b, and the work efficiency can be improved even in the manufacturing process of the mold of the dispensing cap. Is preferable.

Then, the angle θ with the resin gate portion position P _IN of the substantially fan-shaped thick portion 132 as the central angle is set to a range of 15 ° to 45 °, so that the tension portion 14 is out of the angle range. And it becomes easy to selectively flow resin to the portion between the score 131 inner surface of the closed wall 13 and the score facing surface 13a.

  The above-described score 131 can also be configured as shown in FIG. 3 (modified example).

The structure of the score 131 is such that, in the direction C away from the resin gate position _PIN , the linear first inclined surface 131b that inclines upward following the linear first inclined surface 131a that inclines upward, A linear third inclined surface 131c that inclines downward following the inclined surface 131b, and a linear fourth inclined surface 131d that inclines downward following the third inclined surface 131c; This is different from the structure of the score 131 shown in FIG. Even in this case, similarly to the score 131 shown in FIG. 2, the second inclined surface 131b has a gentler inclination than the first inclined surface 131a, and the relationship between the inner surface of the score 131 and the score facing surface 13a. , the distance between the junction L _P and scores opposing surface 13a of the second inclined surface 131b and the third inclined surface 131c is minimized. Further, the thickness D2 in the direction C away from the resin gate portion position _PIN of the portion of the closing wall 13 corresponding to the second inclined surface 131b is the resin gate portion position of the portion of the closing wall 13 corresponding to the first inclined surface 131a. It is more gradual than the change in thickness D1 in the direction away from _PIN .

Therefore, even in the dispensing cap 1 in which the score 131 having the structure shown in FIG. 3 is formed, the opening strength necessary for cutting the planned opening portion 130 along the score 131 is the same as in the case shown in FIG. The operation of forming the spout (opening) corresponding to the planned opening portion 130 on the closing wall 13 of the pouring portion 12 by opening the score 131 is easier. In addition, the flowing resin can relatively smoothly pass the portion where the distance from the score-opposing surface 13a is the minimum (the joint portion L _P between the second inclined surface 131b and the third inclined surface 131c). It is possible to prevent molding defects caused by the resin, such as the occurrence of defects.

In the above-described dispensing cap 1, the resin gate portion position P _IN is set at the center of the planned opening portion 130 on the upper surface of the closing wall 13. Of course, it can be set to a position where the fluidity of the resin is taken into consideration in the dispensing cap 1 (cap body 10 and lid body 20). However, as described above, the opening of the planned opening portion 130 is easy to open, the formation of burr-like fracture fragments at the time of opening, the appearance after opening is improved, the content remaining in the opening is reduced, and the pouring in the wrong direction is prevented. Alternatively, in order to surely prevent molding defects and the like, the resin gate portion position _PIN is preferably set at the center of the planned opening portion 130 in the closing wall 13 or in the vicinity thereof.

In manufacturing the pouring cap, the resin gate position _PIN at the time of injection molding is not limited to the upper surface of the closing wall 13 described above, but may be the lower surface.

  Further, in each of the pouring caps 1 described above, the closing wall 13 has a dish-like shape with a concave central portion, but the structure of the closing wall 13 is not limited to this and is a substantially flat plate-like structure. May be.

The shape of the thick portion 132 is not limited to a fan shape, and may be a straight shape with the resin gate portion position _PIN as a base point. When the straight-shaped thick wall portion is used, if the straight shape has a width that is half or twice the width of the support column 14a with the support column 14a as the center, the inner surface of the tension 131 and the score 131 of the closing wall 13 and the score-facing surface It is preferable because the resin can easily flow selectively to a portion between the portion 13a and 13a. Further, the thick portion 132 may be a surface opposite to the score forming surface.

  The shape of the score 131 that defines the planned opening portion 130 is not limited to the illustrated annular shape, and can be applied to all known score shapes such as a rhombus and an ellipse.

  Also, the shape of the pouring cap is not limited to the illustrated pouring cap with a hinge, but applies to all pouring caps in which a score is formed in the closed portion, the pulling portion is pulled up to open the score portion, and a spout is formed. be able to.

  In any case, various shapes can be selected as long as the function of the present invention is not impaired.

  The pouring cap 1 according to the present invention has an effect that the opening strength can be made relatively low and molding failure due to the resin can be prevented, and is attached to the mouth of the container and formed on the closed wall. It is useful as a pouring cap in which a spout is formed by opening from the score.

DESCRIPTION OF SYMBOLS 1 Pouring cap 10 Cap main body 11 Mounting part 12 Pouring part 13 Closure wall 13a, 13aa Score opposing surface 14 Pulling part 14a Support pillar 14b Pull ring 15 Hinge part 20 Lid 21 Plug body 130 Scheduled opening part 131 Score 131a 1st inclined surface 131b Second inclined surface 131c Third inclined surface 131d Fourth inclined surface 132 Thick part 133 Curved surface

Claims (8)

A mounting portion to be attached to the mouth portion of the container; and a closing wall formed on the inner side of the mounting portion; a score defining an opening planned portion is formed on a lower surface of the closing wall; It is a resin pouring cap formed with a pulling portion protruding from a predetermined site near the score,
The resin gate part position at the time of injection molding with resin is set in the planned opening part,
The inner surface of the score continues from a first inclined surface inclined upward, a second inclined surface inclined more gradually than the first inclined surface following the first inclined surface, and the second inclined surface. A first inclined surface and a third inclined surface inclined in a direction opposite to the second inclined surface;
A pouring cap in which the distance between the second inclined surface and the third inclined surface with respect to the score-opposing surface, which is the surface opposite to the surface on which the score is formed, of the closing wall is minimum.   The pouring cap according to claim 1, wherein the second inclined surface is shorter than the first inclined surface.   The angle α of the first inclined surface with respect to the closed wall is 30 ° to 60 °, the angle β of the second inclined surface is 5 ° to 45 °, and the relationship between the angles α and β is α> β. Item 3. An extraction cap according to item 1 or 2.   The pouring cap according to any one of claims 1 to 3, wherein a portion of the inner surface of the score continuing below the first inclined surface is curved in a convex shape.   The pouring cap according to any one of claims 1 to 4, wherein a thick part is formed at a base of the pulling part. The thick portion, pouring cap according to claim 5, wherein the said resin gate portion placed al approximately fanned shape. The pouring cap according to claim 6, wherein the thick portion has a shape that spreads in a substantially fan shape with an angle θ of 15 ° to 45 ° with the resin gate portion position as a central angle.   The pouring cap according to any one of claims 1 to 7, further comprising a lid that is connected to the mounting portion via a hinge portion and is detachable from the mounting portion by an opening / closing operation using the hinge portion as a fulcrum. .

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