JP2018062382A5 - - Google Patents

Description

Bottle cap

  The present invention relates to a bottle cap that has a raw material storage part that stores a powdery or liquid raw material, and that releases the raw material storage part into the bottle by opening the raw material storage part in accordance with the opening operation.

The inventor has previously provided the bottle cap described in Patent Document 1.
The bottle cap includes a main cap, an inner cap, and a bottom seal cap. The main cap is integrally formed with a cylindrical raw material container that is inserted into the bottle mouth portion in a cap body that is a screw cap that seals the bottle mouth portion. The inner cap has a cylindrical shape that receives the raw material container, and is fitted into the bottle mouth with a strength that does not follow the rise of the bottle opening with the opening of the main cap. The bottom seal cap, which is the bottom lid of the raw material container, is molded integrally with the inner cap so that it can be separated at the boundary with the inner cap, and is fitted to the lower end part of the raw material container to seal the lower end opening. It stops and is connected to the inner cap by a link portion having a spring property.

Although such a structure has the advantage that the number of parts (number of pieces) to be molded is smaller than that before that, it has been found that there are the following problems.
(1) When opening the main cap, the inner cap is press-fitted into the bottle mouth so that the inner cap does not rotate or come out of the bottle mouth with the main cap. If the inner diameter of the mouth becomes larger due to the influence of external temperature or molding conditions, the fitting force will be weakened, and the entire bottle cap will come out of the bottle mouth as the main cap is opened. There is a risk that it will not be able to perform its functions at all.
(2) The bottom seal cap is formed integrally with the inner cap so that it can be separated at the separation portion at the boundary with the inner cap, and the lower end opening of the raw material storage portion is sealed with the inner cap. The thickness must be thinner than the rest and uniform over the entire circumference. However, such molding is difficult and results in poor yield, and when the inner cap is thin due to the separation part, cracks etc. are partially generated, and water vapor and liquid accumulate in the bacteria. Hygiene issues such as breeding hotbeds also arise.
(3) It is preferable that the thickness of the raw material container is made as thin as possible in terms of resin molding. Then, there is a problem that external light is transmitted to the inside of the raw material container and the raw material stored in the raw material container is altered.
(4) Since the structure is such that the bottom seal cap is forcibly separated from the inner cap at the separation portion, fragments due to the separation are generated, which may be mixed into the bottle.
(5) Although it becomes a two-piece molded product as a whole, if the dimensional relationship between the inner cap and the bottom seal cap integrally molded with the main cap raw material storage is not accurate, the raw material storage by the bottom seal cap Since the sealing of the lower end opening is insufficient, and the relationship between the raw material storage portion and the inner cap must be a dimensional relationship that does not cause a gap to store water vapor or liquid, strict molding accuracy is required.

JP 2014-94779 A

The first problem of the present invention is to provide a bottle cap that can solve all of the above problems, that is,
(1) When opening the main cap, the entire bottle cap does not come out of the bottle mouth, and the bottom opening of the raw material container can be reliably opened by the bottom seal cap.
(2) While the difficulty of molding is much lower than before, the tolerance of dimensional accuracy is increased, the assembly work is easy, and the manufacturing cost can be reduced.
(3) When the bottom seal cap that seals the lower end opening of the raw material storage part is separated from the raw material storage part and opened, there is no fragmentation due to separation, and it becomes a hotbed for bacterial propagation To eliminate as much as possible,
(4) Preventing the deterioration of the raw material stored in the raw material storage unit due to external light, etc., and also providing antibacterial protection to the raw material storage unit,
It is in.

  1st invention which is the main structures as a bottle cap is the resin main which integrally provided the cylindrical raw material accommodating part inserted in a bottle mouth part in the cap main body which is a screw cap which seals a bottle mouth part. A cap, a resin bottom seal cap formed with an annular recess for fitting the lower end portion of the raw material container, a resin core having a metal coating layer formed on the outer surface, and a resin made to insert the raw material container It consists of a ring holder. The core is inserted into the raw material storage portion with its metal coating layer in close contact with the inner surface of the raw material storage portion, and the bottom seal is fitted with the annular recess of the bottom seal cap and the lower end portion of the raw material storage portion. By engaging the meshing part of the cap and ring holder, the lower end opening of the raw material container is sealed with the bottom seal cap, the ring holder is fixed to the bottle mouth, Rotation and raising of the bottom seal cap are regulated by the ring holder, so that the bottom seal cap and the ring holder are disengaged from each other, and the bottom seal cap and the ring holder are disengaged. Is separated from the raw material container and the lower end opening of the raw material container is opened.

In the second invention based on the main configuration as described above, a metal coating layer is also formed on the surface of the bottom seal cap.
In the third invention, the metal coating layer of the core and the bottom seal cap is an aluminum deposition layer.
According to a fourth aspect of the present invention, a claw portion that engages with a rib formed on the outer peripheral surface of the raw material accommodating portion is formed on the upper peripheral edge of the ring holder.

The bottle cap of the first invention according to the main structure is a structure in which a ring holder through which the raw material container of the main cap is inserted as a part thereof, and a bottom seal cap serving as a bottom cover of the raw material container is opened by this ring holder. The ring holder and the bottom seal cap are meshed with each other at meshing portions.
When opening the main cap for the bottle mouth part, the raw material storage part does not participate in the ring holder and it will come out from here, but since the ring holder is fixed to the bottle mouth part, The bottom seal cap is reliably regulated from rising and rotating without coming off, and the bottom seal cap is separated from the rising raw material container, and is also unsealed from the ring holder and opened.
The inside of the raw material container is protected by inserting a core having a metal coating layer formed on the outer surface.
Because of such a structure and action, the bottom seal cap can be reliably opened along with the opening operation of the main cap. Since the four members of the main cap, the core, the ring holder, and the bottom seal cap do not require high accuracy in the dimensional relationship with each other, the molding and assembling operations become much easier, and the manufacturing cost can be reduced. Fragments do not occur when the bottom seal cap is separated and opened. Between the raw material storage and the ring holder, a gap sufficient to actively circulate the liquid, which is the contents in the bottle, can be formed, so there is no stagnation and the hygiene can be improved. Since the metal coating layer on the outer surface of the child is in close contact with the inner surface of the raw material container and blocks the transmission of external light into the raw material container, the alteration of the raw material contained in the raw material container can be Even if the part is transparent, it can be prevented and has a bactericidal effect.
Since the ring holder remains in the bottle mouth portion, the bottom seal cap after opening is prevented from coming out of the bottle mouth portion.

In the second invention, since the metal coating layer is also formed on the surface of the bottom seal cap, the inside of the raw material container can be prevented from being altered by the light shielding and the antibacterial effect by the bottom seal cap in addition to the core. .
In the third invention, the metal coating layer can be formed economically by a general aluminum vapor deposition method.
In the fourth aspect of the present invention, the claw portion that engages with the rib on the outer peripheral surface of the raw material storage portion is formed on the ring holder side. Therefore, when performing the closing operation for screwing the main cap onto the bottle mouth portion, the bottom seal cap is It can prevent coming off from a raw material accommodating part. That is, at the time of the closing operation, the raw material container is inserted into the bottle mouth with the ring holder while rotating together with the bottom seal cap having the annular recess fitted to the lower end portion thereof. If it does not rotate together with the raw material container, the annular recess of the bottom seal cap and the lower end portion of the raw material container are disengaged, and the bottom seal cap may fall off from the raw material container. Therefore, if the claw portion of the ring holder is engaged with the rib of the raw material storage portion, the ring holder also rotates integrally with the raw material storage portion, so that inadvertent removal of the bottom seal cap during the closing operation can be prevented.

It is a front view of the bottle cap which is an Example of this invention. It is the bottom view. It is sectional drawing of the state which mounted | wore the bottle mouth part with this. It is a disassembled perspective view of this Example. It is a decomposition | disassembly longitudinal cross-sectional view of the main cap and core in this Example. It is these assembly cross-sectional views. It is a longitudinal cross-sectional view of the ring holder in this Example. It is a bottom view similarly. It is sectional drawing of the bottom seal cap in this Example. It is a bottom view similarly. It is sectional drawing when the bottle cap of this Example is opened. It is sectional drawing which showed the manufacturing method of the bottle cap of this Example in process order.

  The bottle cap of the embodiment of the present invention will be described as Example 1, and then the embodiment of the manufacturing method will be described as Example 2.

  As shown in FIGS. 1 to 4, the bottle cap 100 </ b> A of this embodiment is formed by assembling four parts, which are a main cap 1, a core 20, a ring holder 2, and a bottom seal cap 3, each integrally molded with resin. It is configured and used by being attached to the mouth 101a of the bottle 101. The details of each part will be described with reference to these drawings, and then the assembly structure will be described.

As shown in a perspective view in FIG. 4, a longitudinal section in FIG. 5, and a transverse section in FIG. 6, the main cap 1 has a cap body 4 composed of a top portion 4a and a body portion 4b having the same shape as a general screw cap. None, a cylindrical raw material storage portion 5 having a lower end opening 5a is integrally formed on the lower surface of the top portion 4a so as to be longer and lower than the body portion 4b. A threaded portion 6 that is screwed into the bottle mouth portion 101a is formed on the inner peripheral surface of the body portion 4b. The lower peripheral edge portion of the body portion 4b is a lock ring portion 9 that is separable by leaving the thin ribs 7 at several places and forming cuts 8 on the entire circumference. A plurality of circumferential portions of the ring portion 9 have cross sections that swell inward.
Further, on the lower surface of the top portion 4a, side seal projections 10 are integrally formed on the entire circumference around the base portion of the raw material storage section 5, and a sharp triangular cross section having a sharp point on the outer circumference. The upper seal projection 11 is integrally formed on the entire circumference.
A plurality of vertically long ribs 12 extending straight from the upper end to the middle portion are integrally formed on the outer peripheral surface of the raw material storage portion 5 with a spacing in the circumferential direction. The longitudinal ribs 12 reinforce the raw material storage portion 5 and also serve as engaging portions with the upper edge portion of the ring holder 2 as will be described later.

  As shown in the perspective view of FIG. 4 and the longitudinal section of FIG. 5, the core 20 is composed of a top portion 20c and a cylindrical body portion 20d, and a thin metal coating layer 20a is formed on these outer surfaces by vapor deposition of aluminum. At the same time, a shallow depression 20b for storing air is formed in the center of the top portion 20c. Thus, the core 20 covered with the metal coating layer 20a has a size close to the inner top surface and the inner peripheral surface of the raw material storage portion 5 of the main cap 1, but the length of the trunk portion 20d is as follows. It is shorter than the length of the raw material storage part 5. The length to be shortened is matched to the insertion length because a part of the bottom seal cap 3 is inserted into the raw material storage unit 5 as described later.

The ring holder 2 has a ring shape that allows the raw material storage unit 5 to be inserted, and is transparent or translucent. The inner peripheral surface of the ring holder 2 is curved as shown in a cross-section in FIG. 7 and a bottom in FIG. Concavities and convexities are alternately repeated in a wave shape in the circumferential direction, and the ring holder 2 has a cross section in which the thickness is periodically changed inward. In addition, the ring holder 2 is formed with a plurality of (three in this example) that are meshed with the bottom seal cap 3 by forming rectangular missing portions 2a reaching the lower peripheral edge at a plurality of locations in the circumferential direction. The tooth part 2b is formed. The outer peripheral surface of each tooth | gear part 2b becomes an inclined surface which makes thickness thin as it goes to a lower end.
In addition, triangular claw portions 2 d are formed at a plurality of locations in the circumferential direction on the upper peripheral edge of the ring holder 2. The claw portion 2d serves as an engaging portion with the vertically long rib 12 of the raw material storage portion 5 of the main cap 1, and the side surface of the claw portion 2d is vertical in order to engage the vertically long rib 12 with the side surfaces.
Further, a residual prevention slit 2e is formed in each lacking portion 2a of the ring holder 2.
The outer diameter of the ring holder 2 is determined according to the inner diameter size of the bottle opening 101a to be attached.

The bottom seal cap 3 has a disk shape larger than the lower end opening 5a of the raw material storage unit 5, and forms an annular recess 13 along a circular outer peripheral edge as shown in a sectional view in FIG. 9 and a bottom view in FIG. A meshing recess 13 b that meshes with the tooth 2 b of the ring holder 2 is formed in the peripheral wall 13 a of the annular recess 13. In addition, a circular concave portion 14 that does not reach the annular concave portion 13 is formed on the upper surface of the bottom seal cap 3 so as to save resin material, and a smaller concentric two-stage double circular concave portion is also formed on the lower surface. 15 is formed. The entire surface of the bottom seal cap 3 is covered with a thin metal coating layer 3a formed by aluminum vapor deposition.
If a connection protrusion 16 is provided on the bottom surface of the bottom seal cap 3 and the bottom seal cap 3 is connected to the ring holder 2 using a flexible connecting member (not shown) using this protrusion 16, The opened bottom seal cap 3 separated from the raw material storage unit 5 can be suspended from the ring holder 2.

Next, an assembly structure of the main cap 1, the core 20, the ring holder 2, and the bottom seal cap 3 molded in this way will be described.
As shown in FIG. 3, the core 20 is inserted into the raw material storage unit 5 until it reaches the inner end of the raw material storage unit 5 of the main cap 1. Thereby, the metal coating layer 20a of the top part 20c of the core 20 is on the top surface in the raw material storage part 5, and the metal coating layer 20a of the trunk part 20d of the core 20 is on the inner peripheral surface of the raw material storage part 5. The core 20 is firmly fixed in the raw material storage unit 5 while leaving its lower end portion in close contact. Since the recess 20b is formed in the top portion 20c of the core 20, when the core 20 is inserted into the raw material storage 5, the air existing between them is pushed into the recess 20b. The core 20 can be easily inserted.

The ring holder 2 is in a state of loosely fitting with the raw material storage portion 5 until the raw material storage portion 5 is inserted into the main cap 1 and hits the lower end of the vertically long rib 12. At this time, the side surfaces of the claw portion 2d of the ring holder 2 and the longitudinal ribs 12 of the raw material storage portion 5 are engaged with each other. Since the inner peripheral surface of the ring holder 2 is alternately wavyly repeated, the ring holder 2 is between the inner peripheral surface of the ring holder 2 and the outer peripheral surface of the raw material storage unit 5 (shown by a chain line in FIG. 8). A sufficient gap is formed at the concave portion of the inner peripheral surface 2.
The raw material container 5 is filled with the raw material 102 after this fitting (see FIG. 3).

  The bottom seal cap 3 meshes with the tooth holder 2b and the meshing recess 13b of the bottom seal cap 3 with respect to the ring holder 2 configured as described above, and with respect to the material storage portion 5 filled with the material 102. The lower end portion of the bottom seal cap 3 is fitted into the annular recess 13 of the bottom seal cap 3, and the lower end opening 5 a is sealed in a state where a part of the bottom seal cap 3 is fitted into the raw material storage portion 5.

  In order to improve the sealing performance by sealing the bottom seal cap 3, for example, a heat welding agent is applied in the annular recess 13 and the lower end portion of the raw material storage portion 5 is fitted, and the fitting portion is used as a hot plate. The contact surface is bonded with a molten heat-welding agent by heating with an ultrasonic sealer or a high-frequency sealer. At that time, considering the distribution conditions of the temperature at which the contents in the bottle 101 are distributed as a product, if the thermal welding agent changes heat in the distribution process, use a high temperature resistant one. In addition, it is preferable to select ultrasonic welding or high-frequency welding without performing welding using a thermal welding agent.

The bottom seal cap 3 is configured such that the annular recess 13 is fitted to the lower end portion of the raw material storage portion 5 while the portion inside the annular recess 13 is press-fitted into the raw material storage portion 5, and the raw material is stored inside the fitting. Since the lower end opening 5a is sealed by welding with the part 5, the sealing property and the integrity with respect to the raw material storage part 5 are high, and the raw material storage part 5 is pressurized and filled with a gas such as nitrogen, so that the raw material storage part 5 There is no need to ensure airtightness from the inside.
On the other hand, regarding the relationship between the bottom seal cap 3 and the ring holder 2, even if the ring holder 2 is set on the outer periphery of the raw material storage portion 5 as described above, the above-described sealing by the bottom seal cap 3 is dimensioned. The upper and lower dimensions of the lacking portion 2a of the ring holder 2 are set so that the peripheral wall 13a of the bottom seal cap 3 (where there is no meshing recess 13b) can be received by the lacking portion 2a with a margin so that it can be performed with sufficient margin.

In order to attach the bottle cap 100A of the first embodiment in which the four parts are assembled as described above to the bottle mouth portion 101a, the claw portion 2d of the ring holder 2 is attached to the vertically long rib of the raw material storage portion 5, as shown in FIG. The main cap 1 is rotated in the closing direction while the raw material storage portion 5 is inserted into the bottle mouth portion 101a while being engaged with the side surface of the twelve screw portion 101 and the screw portion 101b of the bottle mouth portion 101a. Combine. The screwing is performed until the locking ring portion 9 of the main cap 2 is forcibly passed over and locked to the locking annular protrusion 101c provided in the bottle mouth portion 101a.
During this operation, the bottom seal cap 3 rotates together with the raw material container 5, and the ring holder 2 also engages with the vertically long ribs 12 of the ring holder 2, and rotates together with the raw material container 5 and the bottom seal cap 3, so that the bottom seal cap 3 rotates. The cap 3 does not come off from the raw material container 5.
When the lock state is reached, the sharp upper seal projection 11 provided on the top 4a of the main cap 2 bites into the upper end surface of the bottle mouth portion 101a, and the main cap 1 side Since the part seal projection 10 is also in pressure contact with the inner peripheral surface of the bottle mouth part 101a, the sealing performance by the cap body 4a at the upper edge of the bottle mouth part 101a is extremely high.

  Thereafter, an ultrasonic wave is emitted from the outside of the bottle mouth portion 101a by a pinpoint type ultrasonic welding machine, and the focal point thereof is adjusted, whereby the boundary surface between the ring holder 2 and the bottle mouth portion 101a, that is, the ring holder 2 The ring holder 2 and the inner peripheral surface of the bottle mouth portion 101a are welded to, for example, two points in the upper and lower positions of P1 and P2, or a plurality of points in the respective circumferential directions to pin the ring holder 2 It fixes to the mouth part 101a. In this case, when the bottle 101 is, for example, a PET bottle, that is, made of polyethylene terephthalate (PET), the resin of the ring holder 2 is made of the same polyethylene terephthalate (PET), so that the resins are integrated with each other, and the ring holder 2 can be firmly fixed to the bottle mouth portion 101a. Since welding by ultrasonic waves can adjust the focal point (depth of concentration) and frequency of ultrasonic energy to accurately identify the welding location and degree, it affects the other parts and the raw material 102 in the raw material storage unit 5. Can be avoided.

  When welding with ultrasonic waves in this way, even if the bottle mouth portion 101a is not molded as designed or the inner diameter fluctuates due to an external factor such as a temperature change, the ring holder 2 and the bottle mouth portion 101a As long as they are in contact, those resins can be integrated. When the bottle 101 is a plastic bottle, the bottle mouth portion 101a is also transparent or translucent in most cases. However, since the ring holder 2 is transparent or translucent, the ring holder 2 can be seen from the outside of the bottle mouth portion 101a. Is difficult to see and is recognized as part of the bottle mouth portion 101a.

On the other hand, the ring holder 2 and the raw material storage unit 5 are not fixed to each other, and a sufficient gap is formed in the concave portion on the inner peripheral surface of the ring holder 2, so that the liquid that is the content in the bottle 101 is formed there. Can be distributed.
In addition, the inside of the raw material storage unit 5 is protected by a core 20 having a metal coating layer 20a formed on the outer surface, so that the stored raw material 102 can be prevented from being deteriorated by external light and the like, and has a bactericidal effect.
Since the bottom seal cap 3 also has the metal coating layer 3a formed on the entire surface thereof, the bottom seal cap 3 also has the effect of preventing deterioration to the raw material and the antibacterial effect.

  In order to open the bottle cap 100A attached to the bottle mouth portion 101a in the state as described above, the main cap 1 is rotated in the opening direction as shown in FIG. Then, the main cap 1 moves upward while rotating with respect to the bottle mouth part 101a with the raw material storage part 5, but the ring holder 2 is fixed to the bottle mouth part 101a and the claw part 2d and the raw material Since the engagement with the vertically long ribs 12 of the storage unit 5 is released, it does not follow the raw material storage unit 5. The main cap 1 is separated into upper and lower portions at the notch 8, and the locking ring portion 10 is retained by being locked to the locking annular protrusion 101c of the bottle mouth portion 101a, but the other portions include the raw material storage portion 5 as well. Ascend while rotating.

  However, the bottom seal cap 3 meshes with the teeth 2b of the ring holder 2 where the meshing recess 13b does not move, and the rotation and rise are regulated by the ring holder 2, so that the raw material storage section that rises while rotating 5 is separated from the raw material storage unit 5, and the meshing with the tooth portion 2 b of the ring holder 2 is also released accordingly, so that the bottom seal cap 3 falls into the bottle 101 and is stored in the raw material storage unit 5. The raw material 102 is discharged into the bottle 101. Since the ring holder 2 remains in the bottle mouth portion 101a, the bottom seal cap 3 after opening is prevented from coming out of the bottle mouth portion 101a. When drinking the beverage in the bottle 101, there is a risk that the beverage may not flow out completely because the bottle holder 101a has the ring holder 2. However, a residual prevention slit 2e is formed in the lacking portion 2a of the ring holder 2. Therefore, it will flow out through this slit 2e, and what is called a leftover is not produced.

Next, a method for manufacturing the bottle cap 100A of Example 1 described above will be described. FIG. 12 shows the steps in order from (A) to (G).
As shown in FIG. 2A, after inserting the core 20 into the raw material storage part 5 of the main cap 1 in an inverted posture, the ring holder 2 is brought close to the raw material storage part 5 straightly, As shown in FIG. 5B, the ring holder 2 is set on the outer periphery of the raw material storage part 5 until the raw material storage part 5 is inserted into the ring holder 2 and the ring holder 2 hits the vertically long rib 7. At that time, the claw portion 2d of the ring holder 2 and the vertically long rib 7 are engaged. Thereafter, as shown in FIG. 5C, the raw material 102 is put into the raw material storage unit 5 from above. Next, when using a heat welding agent, after applying the heat welding agent in the annular recess 13 of the bottom seal cap 3, the bottom seal cap 3 is turned over as shown in FIG. As shown in FIG. 5E, the annular recess 13 is fitted to the raw material storage unit 5. In order to increase the sealing performance of the fitting portion, the fitting portion is heated from the outside and welded with a heat welding agent.
The bottle cap 100A that has been sealed with the bottom seal cap 3 in this way is screwed into the bottle mouth portion 101a as described above, as shown in FIG. Thus, ultrasonic welding of the resin between the ring holder 2 and the bottle mouth portion 101a by ultrasonic waves from the outside of the bottle mouth portion 101a is performed in the circumferential direction, for example, at two upper and lower positions of P1 and P2. Do multiple points.

  The bottle cap according to the present invention is not limited to PET bottles and can be widely applied to various containers having a screw-structured mouth.

100A / 160B Bottle cap 101 Bottle 101a Bottle mouth part 101b Screw part 101c Locking annular protrusion 102 Raw material 1 Main cap 2 Ring holder 2a Lack part 2b Tooth part 2c Connection recess 2d Claw part 2e Residual prevention slit 3 Bottom seal cap 3a Metal coating layer 4 Cap body 4a Top part 4b Body part 5 Raw material storage part 5a Lower end opening 6 Screw part 7 Rib 8 Notch 9 Locking ring part 10 Side seal projection part 11 Upper seal projection part 12 Long rib 13 Annular recess 13a peripheral wall 13b meshing recess 14/15 recess 16 connecting projection 20 core 20a metal coating layer 20b recess 20c top 20d trunk

Claims (4)

A resin main cap integrally provided with a cylindrical raw material container inserted into the bottle mouth portion on the cap body that is a screw cap for sealing the bottle mouth portion,
A resin bottom seal cap formed with an annular recess for fitting the lower end portion of the raw material accommodating portion;
A resin core having a metal coating layer formed on the outer surface;
It consists of a resin ring holder through which the raw material storage part is inserted,
The core is inserted into the raw material container by bringing its metal coating layer into close contact with the inner surface of the raw material container,
While fitting the annular recess of the bottom seal cap and the lower end portion of the raw material storage portion, and engaging the meshing portion of the bottom seal cap and the ring holder, the lower end opening of the raw material storage portion becomes the bottom seal cap. Sealed
The ring holder is fixed to the bottle mouth,
When the bottom cap is rotated and lifted when the main cap is opened and rotated, the bottom holder cap is regulated by the ring holder so that the lower end portion of the raw material container and the bottom seal cap are fitted to each other. A bottle cap characterized in that the bottom seal cap and the ring holder are disengaged, the bottom seal cap is separated from the raw material container, and the lower end opening of the raw material container is opened.   The bottle cap according to claim 1, wherein a metal coating layer is formed on a surface of the bottom seal cap.   The bottle cap according to claim 2, wherein the metal coating layer of the core and the bottom seal cap is an aluminum vapor deposition layer.   The bottle cap according to claim 1, 2, or 3, wherein a claw portion that engages with a rib formed on an outer peripheral surface of the raw material storage portion is formed on an upper peripheral edge of the ring holder.