JP2018111502A - cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cap which can easily perform opening operation for a food container.SOLUTION: A cap 2 is detachably mounted to a container body 11 filled with a liquid food, and a mouth part 5 of a food container 1 having a port member 3 having a fixing part 4 fixed to the container body 11 and the mouth part 5 which is formed so as to project from the fixing portion 4 in a tubular manner and discharges the liquid food, and is detached from the mouth part 5 by performing rotating operation around a central axis of the mouth part 5 in a fitting state mounted to the mouth part 5. The cap 2 has a pair of blade parts 7 which is separated from the fixing portion 4 in the fitting state and projects to an opposite side through the central axis of the mouth part 5, and each of the blade parts 7 has a curved and recessed surface 71 that is hooked by fingers at the time of the rotating operation and is curved in a recessed shape toward a rotation operation direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cap.

  As a container filled with fluid food (including beverages), a flexible container including a flexible bag-shaped main body and a mouth is known (for example, see Patent Document 1). ). In the flexible container described in Patent Document 1, a cap is attached (screwed) to the mouth in an unused state, and the mouth is sealed. And in order to use a flexible container, a cap is first made to detach | leave from a mouth part, and an internal foodstuff can be eaten after that.

  However, the cap attached to such a flexible container has been designed with an emphasis on ensuring the sealing performance at the time of mounting, and the operability at the time of opening (detaching operation from the mouth) In general, the shape for facilitating the process is not considered as much as the sealing performance.

Japanese Patent Laid-Open No. 2003-2339

  The objective of this invention is providing the cap which can perform the opening operation with respect to a food container easily.

Such an object is achieved by the present inventions (1) to (10) below.
(1) a container body filled with a liquid food;
Removably attached to the mouth portion of the food container, comprising: a fixing portion fixed to the container body; and a port member having a tubular shape protruding from the fixing portion and having a mouth portion through which the liquid food is discharged. A cap that is detached from the mouth when a rotation operation is performed around a central axis of the mouth from a wearing state attached to the mouth;
A pair of blade portions that are spaced apart from the fixed portion in the mounted state and protrude on opposite sides through the central axis of the mouth portion;
Each said blade | wing part has a curved concave surface which a finger | toe hung at the time of the said rotation operation, and curved in the concave shape toward the said rotation operation direction.

  (2) The cap according to (1), wherein a curvature radius of the curved concave surface is 3 mm or more and 15 mm or less.

  (3) The cap according to (1) or (2), wherein a distance between each blade portion and the fixed portion is 1.5 mm or more and 10 mm or less.

  (4) The length of each of the blade portions along the central axis of the mouth portion is longer than the length of the fixed portion along the central axis of the mouth portion according to any one of the above (1) to (3). The described cap.

  (5) The cap according to any one of (1) to (4), wherein a length along a central axis of the mouth portion of each blade portion is 10 mm or more and 20 mm or less.

  (6) The cap according to any one of (1) to (5), wherein a length from a central axis of the mouth portion to an outer edge portion of each blade portion is 8 mm or more and 18 mm or less.

  (7) The cap according to any one of (1) to (6), wherein each of the blade portions has a curved convex surface curved in a convex shape toward the rotation operation direction on the opposite side to the curved concave surface.

  (8) The cap according to (7), wherein a curvature radius of the curved convex surface is larger than a curvature radius of the curved concave surface.

  (9) The cap according to any one of (7) and (8), wherein a curvature radius of the curved convex surface is 20 mm or more and 30 mm or less.

  (10) The cap according to any one of (1) to (9), wherein a marker indicating the rotation operation direction is attached.

  According to the present invention, when performing a rotation operation on the cap, for example, the thumb of the right hand can be hung on the curved concave surface of one of the pair of blade portions, and the curved concave surface of the other blade portion can be hung. For example, the index finger of the right hand can be hung. And it can change to rotation operation rapidly with this finger-hanging state, Therefore Opening operation with respect to a food container is performed easily.

  Further, since the curved concave surface is curved in a concave shape toward the rotational operation direction, the rotational direction of the cap required for opening can be intuitively understood.

FIG. 1 is a perspective view showing a food container with a cap of the present invention attached thereto. FIG. 2 is an enlarged view of a region [A] surrounded by a one-dot chain line in FIG. FIG. 3 is a longitudinal sectional view of the cap and the food container shown in FIG. FIG. 4 is an enlarged view of a region [B] surrounded by an alternate long and short dash line in FIG. FIG. 5 is a perspective view showing the food container with the cap of the present invention detached. FIG. 6 is a partial vertical cross-sectional side view sequentially illustrating a process in which an engagement piece provided on a food container is deformed in accordance with a rotation operation with respect to the cap of the present invention. FIG. 7 is a partial longitudinal cross-sectional side view sequentially illustrating a process in which an engagement piece provided in a food container is deformed in accordance with a rotation operation with respect to the cap of the present invention. FIG. 8 is a partial vertical cross-sectional side view sequentially illustrating a process in which an engagement piece provided in a food container is deformed in accordance with a rotation operation with respect to the cap of the present invention.

Hereinafter, the cap of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
FIG. 1 is a perspective view showing a food container with a cap of the present invention attached thereto. FIG. 2 is an enlarged view of a region [A] surrounded by a one-dot chain line in FIG. FIG. 3 is a longitudinal sectional view of the cap and the food container shown in FIG. FIG. 4 is an enlarged view of a region [B] surrounded by an alternate long and short dash line in FIG. FIG. 5 is a perspective view showing the food container with the cap of the present invention detached. FIGS. 6-8 is a partial longitudinal cross-sectional side view which shows in order the process in which the engagement piece provided in the food container deform | transforms in connection with rotation operation with respect to the cap of this invention, respectively. In the following, for the sake of explanation, the lower side in FIGS.

  The medical instrument shown in FIG. 1 is a capped food container 10 including a food container 1 and a cap 2. Hereinafter, the structure of each part of the food container 10 with a cap is demonstrated.

As shown in FIG. 1, the food container 1 includes a container body 11 and a port member 3.
The container main body 11 is a bag body made of a soft material (for example, a resin material), and the liquid food is filled in advance.

  As shown in FIG. 3, the port member 3 has a fixed portion 4 fixed to the container body 11 and a mouth portion 5 through which liquid food is discharged.

  The fixing portion 4 has a boat shape, and has a front end surface 41 facing the front end direction, and a side surface 42 and a side surface 43 facing the side.

  The tip surface 41 has a rhombus shape when viewed from the top, that is, when viewed from the tip side. Each corner 411 is rounded. Further, the distal end surface 41 is provided with an engagement piece 46 that engages with the cap 2 described later.

  The side surface 42 faces the front side in FIG. 1, and the side surface 43 faces the back side in FIG. The side surface 42 and the side surface 43 are portions fixed to the container body 11. The fixing method is not particularly limited. For example, a method using fusion (thermal fusion, high frequency fusion, ultrasonic fusion, etc.), a method using adhesion (adhesion with an adhesive or a solvent), or the like is used. Can do. Thereby, the airtightness between the container main body 11 and the fixing | fixed part 4 is maintained, Therefore The leak of the liquid food in the container main body 11 etc. can be prevented.

  In addition, as for the fixing | fixed part 4, it is preferable that the hollow part 44 is ensured as much as possible. Thereby, the sink in the fixing | fixed part 4 at the time of port member 3 shaping | molding can be prevented.

  Further, it is preferable that a chamfered portion 45 is provided at the base end portion of the fixed portion 4. Thereby, when fixing | fixing the fixing | fixed part 4 to the container main body 11 by fusion | melting, the burr | flash produced at the time of the fusion | melting can be suppressed (released).

The mouth portion 5 is formed to project in a tubular shape from the distal end surface 41 of the fixed portion 4 toward the distal end direction. As the protruding length _{L 5,} not particularly limited, for example, preferably at 15mm or more 30mm or less, and more preferably 20mm or more 25mm or less. In addition, the mouth portion 5 is preferably formed integrally with the fixing portion 4.

As shown in FIG. 5, a male screw 52 is formed on the outer peripheral portion 51 of the mouth portion 5 at the tip side portion. The female screw 62 of the cap 2 can be screwed onto the male screw 52 (see FIG. 3). Thereby, the cap 2 is attached to the mouth portion 5 (hereinafter, this state is referred to as “attached state”). Further, the cap 2 is detached from the mouth portion 5 by releasing the screwing of the male screw 52 and the female screw 62 (hereinafter, this state is referred to as “disengaged state”). Thus, the cap 2 is detachably attached to the mouth portion 5. The outer diameter φd ₅₁ (see FIG. 5) of the outer peripheral portion 51 of the mouth portion 5 is constant along the central axis O ₅ of the mouth portion 5 and conforms to “ISO80369-3”.

  The mouth 5 communicates with the inside of the container body 11. Thereby, the liquid food in the container main body 11 can be made to flow out from the mouth part 5 in a detached state. In addition, when the liquid food is administered by tube, it can be used by connecting a tube to the mouth portion 5.

As shown in FIG. 3, the inner peripheral portion 53 of the mouth portion 5 has a tapered shape in which the inner diameter φd ₅₃ gradually increases in the distal direction. The inner diameter φd ₅₃ (see FIG. 5) of the inner peripheral portion 53 of the mouth portion 5 is similar to “ISO80369-3” in the same manner as the outer diameter φd ₅₁ of the outer peripheral portion 51 of the mouth portion 5.

  The constituent material of the port member 3 is preferably made of a hard material. Examples of the hard material include rigid polyvinyl chloride, polyethylene, polypropylene, polyolefin such as polybutadiene, polystyrene, poly- (4-methylpentene-1), polycarbonate, ABS resin, acrylic resin, polymethyl methacrylate (PMMA). , Polyacetal, polyarylate, polyacrylonitrile, polyvinylidene fluoride, ionomer, acrylonitrile-butadiene-styrene copolymer, polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PTB), butadiene-styrene copolymer, aromatic Or various resin, such as aliphatic polyamide, or what combined these arbitrarily is mentioned. Among these materials, those having durability against various sterilizations such as steam sterilization and hot water sterilization are more preferable. Such a material can also be used as a constituent material of the cap 2.

  The cap 2 is a member that is detachably attached to the mouth portion 5 of the food container 1 as described above. The cap 2 has a tubular portion 6 that forms a tubular shape, and a pair of blade portions 7.

The cylindrical portion 6 is a base portion of the cap 2. As shown in FIG. 3, a female screw 62 is formed on the inner peripheral portion 61 of the cylindrical portion 6 at the tip side. The female screw 62 can be screwed with the male screw 52 of the mouth portion 5. Thereby, the cap 2 will be in an attachment state, as shown in FIG.1 and FIG.3. The cap 2 in the mounted state can be rotated around the central axis O ₅ of the mouth 5. Thereby, the screwing of the female screw 62 and the male screw 52 can be released, so that the cap 2 is in a detached state as shown in FIG. Note that the cap 2 in the detached state can be put into the mounted state again by rotating the cap 2 in the opposite direction.

  Further, a through hole 67 penetrating from the inner peripheral portion 61 to the outer peripheral portion 66 is formed in the cylindrical portion 6. The through hole 67 is a discharge port that discharges moisture remaining (generated) in the gap 20 between the inner peripheral portion 61 of the cylindrical portion 6 and the outer peripheral portion 51 of the mouth portion 5 during sterilization. As a result, the gap 20 is in a dry state.

  As shown in FIG. 1, the cylindrical part 6 has the front-end | tip wall part 63 which covers the front end side. The tip wall 63 is provided with a marker 631 indicating a rotation operation direction α with respect to the cap 2 at the time of opening. In the present embodiment, the marker 631 is an “arrow”. Thereby, the rotation operation direction α can be accurately grasped.

  As shown in FIG. 4, a fitting portion 64 that is fitted to the inner peripheral portion 53 of the mouth portion 5 in the mounted state is provided on the proximal end side of the distal end wall portion 63. The fitting portion 64 is a cylindrical portion arranged concentrically with the mouth portion 5 in the mounted state, and the outer peripheral portion 641 has the same taper shape as the inner peripheral portion 53 of the mouth portion 5.

  Further, on the proximal end side of the distal end wall portion 63, a lip portion 65 that is in close contact with the chamfered portion 54 of the mouth portion 5 in the mounted state is provided. The lip portion 65 is a ring-shaped portion located on the outer peripheral side of the fitting portion 64, and the inside thereof is inclined in the same direction as the inclined direction of the chamfered portion 54. And the airtightness of the opening | mouth part 5 in a mounting state is maintainable by the synergistic effect of the close_contact | adherence in the lip | rip part 65 and the fitting in the fitting part 64. FIG. Thereby, the aseptic condition in the food container 1 can be maintained until the food container 1 is opened.

As shown in FIG. 1, a pair of blade portions 7 are integrally formed on the outer peripheral portion 66 of the cylindrical portion 6. These blade portions 7 are in a state of protruding to the opposite sides via the central axis O ₅ of the mouth portion 5 in the mounted state. Then, it is possible to multiply the fingers of one hand the blade section 7 in this state, the rotational operation for the cap 2 during opening as it is to the central axis O ₅ around. In this rotation operation, for example, a right thumb can be applied to one of the two blades 7, and a right index finger can be applied to the other blade 7, for example.

  Since the two blade portions 7 have the same configuration except that the formation locations are different, the following description will be made on one blade portion 7 as a representative.

  The blade portion 7 has a curved concave surface 71 and a curved convex surface 72 formed on the opposite side of the curved concave surface 71.

The curved concave surface 71 is curved in a concave shape toward the rotational operation direction α at the time of opening. The radius of curvature _{R 71} of the concave curved surface 71, for example, is preferably at 3mm than 15mm or less, more preferably 5mm or 10mm or less. Thereby, at the time of rotation operation, a finger can be stably put on the curved concave surface 71. When performing the rotation operation, for example, the thumb of the right hand can be hung on the curved concave surface 71 of one of the two blades 7, and the curved concave surface 71 of the other blade 7 can be applied to, for example, the right hand. You can hang your index finger. And it can transfer to rotation operation rapidly with this finger-hanging state. Further, since the curved concave surface 71 is concavely curved toward the rotational operation direction α, the rotational direction (rotational operation direction α) of the cap 2 required for opening can be intuitively understood.

The curved convex surface 72 is curved in a convex shape in the same direction as the curved concave surface 71, that is, in the rotational operation direction α. The curvature radius R ₇₂ of the curved convex surface ₇₂ is larger than the curvature radius R ₇₁ of the curved concave surface 71, and is preferably 20 mm or more and 30 mm or less, and more preferably 22 mm or more and 28 mm or less. Thereby, at the time of rotation operation, a finger can be stably put on the curved convex surface 72. When performing the rotation operation, when the right thumb is hung on the curved concave surface 71 of one of the two blade portions 7 and the right index finger is hung on the curved convex surface 72 of the other blade portion 7, For example, the middle finger of the right hand can be hung (attached) to the curved convex surface 72 of one blade portion 7. Thereby, rotation operation can be performed stably. Similarly to the curved concave surface 71, the curved convex surface 72 is also curved toward the rotational operation direction α. Thereby, coupled with the curvature of the curved concave surface 71, the rotation direction of the cap 2 required for opening becomes intuitively easier to understand.

  As described above, since the curved concave surface 71 and the curved convex surface 72 are formed on the blade portion 7, the opening operation for the food container 1 in the mounted state can be easily performed.

The center axis _{O 5} length _{L 7} along the blade portions 7, preferably at 10mm or more 25mm or less, and more preferably 15mm or more 20mm or less.

Further, the length (width W ₇ ) from the central axis O ₅ to the outer edge portion 73 of the blade portion 7 is preferably 8 mm or more and 18 mm or less, and more preferably 12 mm or more and 17 mm or less. In addition, it is preferable that the outer edge part 73 is rounded.

  Since the blade | wing part 7 becomes such a magnitude | size, a finger | toe can be hung on the curved concave surface 71 and the curved convex surface 72 without excess and deficiency. Thereby, the rotation operation at the time of opening can be performed easily.

The thickness t ₇ of the blade portion _7, i.e., the distance between the concave curved surface 71 and the curved convex surface 72 is preferably gradually decreases toward the outer edge 73.

Moreover, it is preferable that the front end surface 74 of the blade | wing part 7 is roundish. The radius of curvature _{R 74} of the front end surface 74, for example, is preferably from 25mm under above 12 mm, and more preferably 13mm or more 20mm or less.

  In the blade portion 7, it is preferable that the boundary portion 76 between the tip surface 74 and the curved concave surface 71 and the boundary portion 77 between the tip surface 74 and the curved convex surface 72 are rounded (see FIG. 5). . Thereby, for example, the right hand can be reliably hung on the cap 2 at the time of opening, and a feeling of fitting is obtained.

  Moreover, it is preferable that the hollow part 75 is formed inside the blade | wing part 7 (refer FIG. 3). Thereby, weight reduction of the cap 2 is achieved. In addition, the blade | wing part 7 may be the thing which the hollow part 75 penetrated, ie, the thing from which the front end surface 74 was abbreviate | omitted.

  As shown in FIG. 1, the blade portion 7 is separated from the fixed portion 4 in the mounted state. The separation distance AD between the blade portion 7 and the fixed portion 4 is preferably 1.5 mm or more and 10 mm or less, and more preferably 3 mm or more and 8 mm or less. Thereby, for example, when the right hand is put on the cap 2 at the time of opening and the container body 11 is held together with the fixed portion 4 with the left hand, it is possible to reliably prevent interference between the right hand and the left hand due to the rotation operation. Moreover, the visibility with respect to the engagement piece 46 can be ensured, and therefore the state of the engagement piece 46 can be confirmed.

The length L ₇ of the blade portion 7 is longer is preferred than the length L ₄ along the central axis O ₅ of the mouth portion 5 of the fixed part 4. When the length L ₇ is in the numerical range, the length L ₄ is preferably, for example, 10 mm or more and 20 mm or less, and more preferably 12 mm or more and 15 mm or less. Thereby, for example, the right hand can be hung on the cap 2 without excess or deficiency at the time of opening, and the container body 11 can be gripped with the fixing portion 4 with the left hand without excess or deficiency. Moreover, when fusing the fixing | fixed part 4 to the container main body 11, while being able to ensure the fusion | melting area enough, the fusion time can be shortened as much as possible.

  As shown in FIG. 2, an engagement piece 46 is formed to project from the distal end surface 41 of the fixing portion 4 of the port member 3. The engagement piece 46 is inclined in the direction opposite to the rotation operation direction α.

  Further, a concave portion 68 that opens in the proximal direction is formed in the proximal end portion of the cylindrical portion 6 of the cap 2. In the mounted state, the engagement piece 46 is engaged with the recess 68.

  This engagement piece 46 is visible from the outside of the container body 11 between the fixed portion 4 of the port member 3 and the blade portion 7 of the cap 2, that is, through a portion where a separation distance AD is secured. Yes.

  Here, the state of the engagement piece 46 in the process until the cap 2 changes from the mounted state to the detached state will be described with reference to FIGS.

  First, in the mounted state shown in FIG. 6, as described above, the engaging piece 46 that is inclined in the direction opposite to the rotational operation direction α is engaged with the recess 68 of the cap 2. Further, the engagement piece 46 is visible.

  Then, as shown in FIG. 7 from the state shown in FIG. 6, when the cap 2 is rotated in the rotational operation direction α, the engagement piece 46 receives a pressing force in the rotational operation direction α from the recess 68. Accordingly, the engagement piece 46 starts to be deformed in the rotational operation direction α, that is, is deformed from the inclined state shown in FIG. 6 to the standing state with the base portion 461 on the base end side as a fulcrum. Further, the cap 2 moves in the distal direction while rotating in the rotational operation direction α.

  Further, as shown in FIG. 8, when the rotation operation with respect to the cap 2 is continued, the engagement piece 46 is finally deformed beyond the elastic limit due to the pressing force from the recess 68, and thus the rotation. It is plastically deformed in the operation direction α, that is, it is inclined in the direction opposite to the inclined direction shown in FIG.

  As described above, the shape of the engaging piece 46 changes before and after the cap 2 is opened. Thereby, even if it recaptures, it can grasp | ascertain whether the food container 1 (food container 10 with a cap) was once opened by visually recognizing the engagement piece 46. FIG. Therefore, the food container 1 is excellent in tamper-proof property (the fact that it has once been used can be confirmed later), that is, tamper evidence property (opening history function).

The projection height _{H 46} of the engaging piece 46 is not particularly limited, for example, is preferably at 1.5mm or more 10mm or less, more preferably 1.5mm or more 5mm or less.

Further, the engagement piece 46 has a maximum thickness portion 462 where the thickness t ₄₆ when viewed from the outer peripheral side of the mouth portion 5 is maximized in a state before being deformed. The thickness t ₄₆ of the maximum thickness portion 462 is, for example, preferably from 0.5 mm to 1 mm, and more preferably from 0.6 mm to 0.9 mm.

The width W ₄₆ of the engagement piece 46 is constant along the protruding direction of the engagement piece 46. The width W _{46 of the} engagement piece 46 is larger than the thickness t ₄₆ of the maximum thickness portion 462, for example, preferably 0.5 mm or more and 5 mm or less, and more preferably 1 mm or more and 3 mm or less.

  The engaging piece 46 having such a size is prevented from being unintentionally deformed before the cap 2 is opened, and becomes a portion that can be reliably plastically deformed after the cap 2 is opened.

Further, when the engaging piece 46 is inclined in the direction opposite to the rotational operation direction α, the cap 2 is detached from the food container 1 rather than the tockle required when the cap 2 is attached to the food container 1 and assembled. The tokuru required for is larger. Such a toggle size relationship is maintained regardless of the size of the thickness t ₄₆ of the maximum thickness portion 462, for example.

  Further, since the engaging piece 46 is formed to protrude from the distal end surface 41 of the fixed portion 4, the visibility with respect to the engaging piece 46 is reliably ensured.

In addition, it is preferable that two engagement pieces 46 are disposed on the opposite sides of each other via the mouth portion 5. Thus, it is possible to visually recognize the engagement piece 46 from either direction of the central axis O ₅ around.

  The cap of the present invention has been described above with respect to the illustrated embodiment. However, the present invention is not limited to this, and each component constituting the cap is replaced with an arbitrary configuration that can exhibit the same function. can do. Moreover, arbitrary components may be added.

  The number of engagement pieces formed is preferably two in the embodiment, but is not limited to this, and may be one or three or more, for example. Depending on the number of engagement pieces formed, the torque to the cap required for opening can be adjusted.

  Moreover, although the engagement piece was plastically deformed after opening the cap in the above embodiment, the present invention is not limited to this, and may be broken, for example.

DESCRIPTION OF SYMBOLS 10 Food container with cap 1 Food container 11 Container main body 2 Cap 3 Port member 4 Fixed part 41 Front end surface 411 Corner | angular part 42 Side surface 43 Side surface 44 Hollow part 45 Chamfer part 46 Engagement piece 461 Root part 462 Maximum thickness part 5 Mouth part 51 outer peripheral portion 52 male screw 53 inner peripheral portion 54 chamfered portion 6 cylindrical portion 61 inner peripheral portion 62 female screw 63 tip wall portion 631 marker 64 fitting portion 641 outer peripheral portion 65 lip portion 66 outer peripheral portion 67 through hole 68 concave portion 7 blade Portion 71 Curved concave surface 72 Curved convex surface 73 Outer edge portion 74 Tip surface 75 Hollow portion 76, 77 Boundary portion 20 Gap AD Separation distance φd ₅₁ Outer diameter φd ₅₃ Inner diameter H ₄₆ Height L ₄ Length L ₅ Projection length L ₇ Length O ₅ central axis R ₇₁ radius of curvature R ₇₂ radius of curvature R ₇₄ radius of curvature t ₄₆ thickness t ₇ thickness W ₄₆ width W ₇ width α Rotation operation direction

Claims (10)

A container body filled with liquid food;
Removably attached to the mouth portion of the food container, comprising: a fixing portion fixed to the container body; and a port member having a tubular shape protruding from the fixing portion and having a mouth portion through which the liquid food is discharged. A cap that is detached from the mouth when a rotation operation is performed around a central axis of the mouth from a wearing state attached to the mouth;
A pair of blade portions that are spaced apart from the fixed portion in the mounted state and protrude on opposite sides through the central axis of the mouth portion;
Each said blade | wing part has a curved concave surface which a finger | toe hung at the time of the said rotation operation, and curved in the concave shape toward the said rotation operation direction.   The cap according to claim 1, wherein a radius of curvature of the curved concave surface is 3 mm or more and 15 mm or less.   The cap according to claim 1 or 2, wherein a separation distance between each blade portion and the fixed portion is 1.5 mm or more and 10 mm or less.   The cap according to any one of claims 1 to 3, wherein a length along the central axis of the mouth portion of each blade portion is longer than a length along the central axis of the mouth portion of the fixed portion.   The cap according to any one of claims 1 to 4, wherein a length along a central axis of the mouth portion of each blade portion is 10 mm or more and 20 mm or less.   The cap according to any one of claims 1 to 5, wherein a length from a central axis of the mouth portion to an outer edge portion of each blade portion is 8 mm or more and 18 mm or less.   Each said blade | wing part is a cap of any one of Claim 1 thru | or 6 which has the curved convex surface curved in convex shape toward the said rotation operation direction on the opposite side to the said curved concave surface.   The cap according to claim 7, wherein a curvature radius of the curved convex surface is larger than a curvature radius of the curved concave surface.   The cap according to any one of claims 7 and 8, wherein a curvature radius of the curved convex surface is 20 mm or more and 30 mm or less.   The cap according to claim 1, wherein a marker indicating the rotation operation direction is attached.

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