JP7011802B2 - Medical cap and its manufacturing method - Google Patents

Description

The present invention relates to a medical cap used for an infusion container, a blood collection tube, a drug container such as a vial, and a method for manufacturing the same. In particular, the present invention relates to a medical cap provided with an elastic plug that can be pierced by a needle for medical use, and a method for manufacturing the same.

At the mouth of a drug container such as a drug solution bottle used in the medical field or an infusion bottle for drip, the inside of an outer frame (for example, a thermoplastic synthetic resin, etc.) is placed so that the drug solution can be taken out with a needle. A medical cap provided with an elastic stopper (for example, rubber, a thermoplastic elastomer resin, etc.) is used (see, for example, Patent Documents 1 to 3 below).

Such a medical cap is attached by welding an outer frame body to the mouth of a drug container or the like. Then, at the time of use, an injection needle provided with a take-out tube is pierced into the elastic plug, the drug container is placed on the upper side, and the cap is placed on the lower side, so that the infusion solution in the container is placed through the take-out tube. Take out. Further, such a medical cap is required to be hermetically sealed in order to prevent leakage of chemicals and infusions and to prevent deterioration due to contact with air.

Further, for the production of the medical cap, for example, a two-color molding method or an insert molding method is used. In the case of the two-color molding method, after molding an elastic stopper using a common mold (lower mold) and an upper mold, the elastic stopper is left in the common mold and then with another upper mold. Combine to form the outer frame. In the case of this method, the elastic plug body is in close contact with the outer frame body in a heat-welded state on the contact surface.

Further, in the case of the insert molding method, the elastic stopper body prepared in advance by the injection molding method, the compression molding method or the like is inserted into a pair of molds for molding the outer frame body, and then the outer frame body is molded. Even in the case of this method, the elastic plug body is in close contact with the outer frame body in a heat-welded state on the contact surface.

By the way, when molding an elastic stopper, the elastic stopper may be left behind in the mold when the mold is opened, and a mold release defect may occur. In particular, when the elastic plug is made of a thermoplastic elastomer resin and a mold consisting of a combination of a male mold (core) and a female mold (cavity) is used, the adhesiveness of the elastic stopper is high. The elastic plug may adhere to the female mold, making it difficult to remove the mold. As a result, there is a problem that the manufacturing efficiency of the medical cap is lowered.

Japanese Unexamined Patent Publication No. 2012-239529 Japanese Unexamined Patent Publication No. 2013-013585 Japanese Unexamined Patent Publication No. 2014-027980

The present invention has been made in view of the above problems, and an object thereof is that when the mold is opened, the elastic stopper is in close contact with the female mold (cavity) side, for example, and a mold release defect occurs. It is an object of the present invention to provide a medical cap and a method for producing the same, which can suppress the above-mentioned problems and prevent the production efficiency from being reduced.

The medical cap according to the present invention is a medical cap having an elastic plug body and an outer frame body for holding the elastic plug body inside in order to solve the above-mentioned problems, and the elastic plug body and the elastic plug body. The contact surface of the outer frame body is heat-welded, and at least one engaged portion for engaging the elastic plug body with the mold is provided on the side peripheral portion and / or the bottom surface portion of the elastic plug body. It is characterized by being provided with one.

In the above configuration, it is preferable that the surface of the side peripheral portion and / or the bottom surface portion of the elastic plug has a fine uneven structure.

Further, in the above configuration, it is preferable that the surface of the side peripheral portion and / or the bottom surface portion of the elastic plug body has a fine concavo-convex structure except for the engaged portion.

In the above configuration, a parting line may be provided on the side peripheral portion of the elastic plug body at an arbitrary position on the side opposite to the bottom surface portion with respect to the engaged portion.

Further, in the above configuration, a parting line may not be provided on the side peripheral portion of the elastic plug body.

In the above configuration, it is preferable that the engaged portion is at least one of a convex portion, a concave portion, and a flange portion.

Further, in the above configuration, the engaged portion of the elastic plug has a vertical cross section that becomes tapered in a direction away from the mold when the elastic plug is engaged with the mold. It is preferable to have a shape.

Further, in the method for manufacturing a medical cap according to the present invention, in order to solve the above-mentioned problems, a method for manufacturing a medical cap having the elastic plug body and an outer frame body for internally holding the elastic plug body. A mold of a first mold provided with at least one engaging portion for forming an engaged portion on a side peripheral portion and / or a bottom surface portion of the elastic plug body, and a mold of the first mold. It is characterized by comprising an elastic stopper molding step of forming an elastic stopper provided with at least one engaged portion by using a second mold for forming a cavity for forming an elastic stopper by closing. ..

In the above configuration, the cavity for forming the outer frame is formed by closing the third mold on which the elastic stopper produced in the elastic stopper forming step can be placed and the third mold. Further including an outer frame body forming step of forming an outer frame body using a fourth mold to be formed, the third mold uses the first mold as a common mold, and the outer frame. The body forming step is performed in a state where the engaged portion of the elastic stopper is engaged with the engaging portion of the first mold and the elastic stopper after molding is fixed to the first mold. Can be done.

Further, in the above configuration, the outer frame is formed by closing the third mold on which the elastic stopper produced in the elastic stopper forming step can be placed and the third mold. Further including an outer frame body forming step of forming an outer frame body using a fourth mold for forming a cavity, the third mold can engage an engaged portion of the elastic stopper. In the outer frame molding step, the engaged portion of the elastic stopper is engaged with the other engagement portion of the third mold, and the elastic stopper after molding is provided. The body can be fixed to the third mold.

In the above configuration, the inner wall surface of the first mold may be provided with a fine uneven structure on the portion of the inner wall surface of the first mold that forms the side peripheral portion and / or the bottom surface portion of the elastic plug body.

Further, in the above configuration, the inner wall surface of the first mold has a fine uneven structure on the portion of the inner wall surface of the elastic stopper that forms the side peripheral portion and / or the bottom surface portion excluding the engaged portion of the elastic stopper. May be provided.

Further, in the above configuration, the joint surface formed when the first mold and the second mold are closed is the bottom surface portion with respect to the formation position of the engaged portion of the elastic plug body. It is preferably located on the opposite side of the.

Further, in the above configuration, the joint surface formed when the first mold and the second mold are closed is the bottom surface portion with respect to the formation position of the engaged portion of the elastic plug body. It is preferably located below.

In the above configuration, the engaging portion of the first mold is for the convex portion forming cavity portion for forming the engaged portion formed of the convex portion with respect to the elastic plug body, with respect to the elastic plug body. It is either a concave portion forming convex portion for forming an engaged portion made of a concave portion, or a flange portion forming cavity portion for forming an engaged portion made of a flange portion with respect to the elastic stopper. Is preferable.

Further, in the above configuration, it is preferable that the engaging portion of the first mold has a vertical cross-sectional shape that tapers in a direction away from the second mold that closes the mold.

According to the present invention, the elastic plug body includes at least one engaged portion for engaging with the mold on its side peripheral portion and bottom surface portion. Thereby, for example, after molding the elastic stopper body, when the mold is opened, the engaged portion of the molded elastic stopper body can be engaged with and fixed to one of the molds. As a result, it is possible to prevent the elastic plug from coming into close contact with the other mold and causing a mold release defect. That is, according to the present invention, there is a medical cap and a manufacturing method thereof that can suppress the occurrence of mold release failure of the elastic plug when the mold is opened and prevent the manufacturing efficiency from being lowered. Can be provided.

FIG. (A) is a schematic cross-sectional view showing the medical cap according to the first embodiment, and FIG. 6 (b) is a schematic cross-sectional view showing a state in which the medical cap is attached to a drug container. It is explanatory drawing for demonstrating the elastic plug body of the medical cap, FIG. It is a cross-sectional view taken along the line AA. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the medical cap, and FIG. FIG. (B) shows how the mold is opened after the elastic stopper is molded, FIG. 3C shows how the outer frame is molded, and FIG. 3D shows medical treatment after molding. Represents a cap. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line BB. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. It is a cross-sectional view taken along the line CC of). It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line DD. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line EE. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line FF. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line GG. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line OH. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line I-I. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the medical cap which concerns on Embodiment 2, and FIG. The figure (b) shows the state of opening the mold after the elastic plug is molded, and the figure (c) shows the state of inserting the elastic plug into another mold. , The figure (d) shows the state of molding the outer frame body, and the figure (e) shows the medical cap after molding. FIG. (A) is a schematic cross-sectional view showing the medical cap according to the third embodiment, and FIG. 6 (b) is a schematic cross-sectional view showing a state in which the medical cap is attached to a drug container. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the medical cap, and FIG. FIG. (B) shows how the mold is opened after the elastic stopper is molded, FIG. 3C shows how the outer frame is molded, and FIG. 3D shows medical treatment after molding. Represents a cap. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line JJ. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line KK. It is explanatory drawing for demonstrating the other elastic plug body of the medical cap, FIG. ) Is a cross-sectional view taken along the line LL.

(Embodiment 1)
[Medical cap]
The medical cap according to the first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. However, parts unnecessary for the explanation are omitted, and some parts are shown in an enlarged or reduced size for the sake of ease of explanation.

FIG. 1A is a schematic cross-sectional view showing a medical cap according to the first embodiment, and FIG. 1B is a schematic cross-sectional view showing a state in which the medical cap is attached to a drug container. 2A and 2B are plan views schematically showing the needle stick surface of the elastic plug in the medical cap, and FIG. 2B is a schematic cross-sectional view showing the elastic plug. In FIG. 1A, the XYZ orthogonal coordinate axes are appropriately displayed in order to clarify the directional relationship of the illustrated ones. In FIG. 1, the XY plane represents a horizontal plane, and the ten-Z direction represents a vertically upward direction.

As shown in FIG. 1, the medical cap 10 of the present embodiment has at least an elastic plug 11 and an outer frame 12 that holds the elastic plug 11 inside. The elastic plug 11 and the outer frame 12 are heat-welded at the contact surface between them (details will be described later). As a result, it is possible to prevent the elastic plug 11 from falling off from the outer frame 12, and to prevent the generation of voids due to the misalignment between the elastic plug 11 and the outer frame 12 during needle sticking. As a result, it is possible to improve the airtightness, prevent leakage of chemicals and infusions, and prevent deterioration due to contact with air.

Here, "heat welding" is a result of melting the surface of the elastic plug 11 in contact with the outer frame body 12 by the heat of the molten resin injected when the outer frame body 12 is molded by injection molding or the like, as described later. It means that the outer frame body 12 and the elastic plug 11 are in a state of being bonded at the contact surface thereof after the outer frame body 12 is molded.

The overall shape of the elastic plug 11 is substantially cylindrical as shown in FIGS. 1 and 2. However, the present invention is not limited to this, and may be, for example, a substantially truncated cone shape. In addition, various shapes described later can be adopted.

The elastic plug 11 is housed inside the outer frame 12 with the top surface portion 111 on the upper side (+ Z direction in FIG. 1A) and the bottom surface portion 112 on the lower side. The top surface portion 111 has a needle stick surface 111b except for the peripheral portion 111a thereof. Here, the "needle puncture surface" means a surface on which the medical cap 10 according to the present embodiment is attached to the drug container and the needle puncture is performed by the puncture needle when taking out the drug solution or the like. The peripheral edge portion 111a of the top surface portion 111 is covered with a part of the outer frame body 12 and is heat-welded on the contact surface (in FIG. 2A, the hatched region is represented). Further, the needle puncture surface 111b may be provided with at least one recess (not shown) that serves as a position index when puncturing with a puncture needle.

The entire surface of the bottom surface portion 112 is a wetted surface. Here, the "contact surface" means a surface in contact with the chemical solution or the like stored in the pharmaceutical container.

The side peripheral portion 113 of the elastic plug 11 is provided with an engaged portion 114 for engaging the elastic plug 11 with the mold. Thereby, for example, after the elastic plug 11 is molded, the molded elastic plug 11 can be engaged with and fixed to the mold when the mold is opened. In the side peripheral portion 113, the portion 113a above the formation position of the engaged portion 114 (hereinafter referred to as “above the side peripheral portion”) 113a is heat-welded to the inner wall surface of the outer frame body 12. On the other hand, the engaged portion 114 and the portion 113b below the formed position of the engaged portion 114 (hereinafter referred to as "lower side peripheral portion") are not in contact with the inner wall surface of the outer frame body 12 and are open. (See Fig. 1).

In the present embodiment, a parting line PL is provided at the boundary between the upper side peripheral portion 113a and the engaged portion 114. As will be described later, the parting line PL is formed corresponding to the joint surface (or division position) of the pair of molds for forming the elastic plug 11. In the present embodiment, the parting line PL needs to be provided above the engaged portion 114 (in the + Z direction in FIG. 1A), that is, at an arbitrary position above the side peripheral portion 113a. Will be. When the parting line PL is provided at the engaged portion 114 or the lower side peripheral portion 113b, the split position of the pair of molds is lowered to the engaged portion 114 or the lower peripheral portion 113b, and is engaged. This is because it becomes difficult to engage the portion 114 with the mold.

The engaged portion 114 is formed of an annular recess. The depth h and width d (see FIG. 2B) of the engaged portion 114 are not particularly limited as long as the elastic stopper 11 can be engaged and fixed to the mold, and are appropriately set. be able to. The height and diameter of the elastic plug 11 are not particularly limited, and can be appropriately set as needed.

The side peripheral portion 113 has a surface having a fine uneven structure. As a result, when the elastic plug 11 is formed, the air existing in the cavity 23 can be discharged to the outside, and the side peripheral portion 113 can be provided with the function of an air vent. Further, when the surface of the lower side peripheral portion 113b and the engaged portion 114 has a fine uneven structure, the engaged portion 114 is engaged with the mold and the elastic plug 11 is fixed to the mold. In addition, the frictional resistance at the contact surface with the mold can be increased, and the engagement with the mold can be strengthened. Here, the degree of unevenness (surface roughness) in the uneven structure differs between the upper side peripheral portion 113a, the lower side peripheral portion 113b, and the engaged portion 114. Specifically, the uneven structure of the upper side peripheral portion 113a has a smaller degree of unevenness (surface roughness) than the uneven structure of the lower side peripheral portion 113b and the engaged portion 114. As a result, when the mold is opened, the elastic stopper 11 is not fixed to the mold, and it is possible to prevent a mold release defect from occurring. The portion having a fine concavo-convex structure on the surface may be either the lower side peripheral portion 113b or the engaged portion 114. Further, the upper 113a of the side peripheral portion may be a smooth surface. This makes it easier to open the mold and further reduces the occurrence of mold release defects.

Further, fine uneven structures may be provided on the surfaces of the top surface portion 111 and the bottom surface portion 112. By providing a fine uneven structure on the surface of the top surface portion 111, the air existing in the cavity 23 can be discharged to the outside even in the top surface portion 111, and the function of the air vent can be further enhanced. Further, providing a fine uneven structure on the surface of the top surface portion 111 makes it possible to reduce appearance defects when the elastic plug 11 is formed by, for example, compression molding. Further, when the elastic stopper 11 is molded by injection molding, the generation of weld lines can be reduced and the appearance defect can be reduced. The surfaces of the top surface portion 111 and the bottom surface portion 112 may have a fine uneven structure or may be flat.

The surface roughness of the uneven structure of the upper side peripheral portion 113a is particularly small as long as the degree of unevenness is smaller than that of the lower side peripheral portion 113b and the engaged portion 114 and can function as an air vent. Not limited. Further, the surface roughness of the uneven structure of the lower side peripheral portion 113b and the engaged portion 114 is not particularly limited as long as it can increase the frictional resistance with the mold, and can be appropriately set. .. Further, the surface roughness of the uneven structure of the top surface portion 111 and the bottom surface portion 112 is not particularly limited, and may be appropriately set as necessary.

Examples of the material used for the elastic stopper 11 include rubber and a thermoplastic elastomer resin. The rubber is not particularly limited, and examples thereof include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and isoprene-isoprene rubber. The thermoplastic elastomer resin is not particularly limited, and examples thereof include olefin-based, styrene-based, polyurethane-based, polyester-based, polyvinyl chloride-based, polybutadiene-based, polyamide-based, and polyurethane-based resins. Of these, thermoplastic elastomers (SEBS, SEPS, HSBR, SEBR, CEBC) obtained by hydrogenating a conjugated diene-based thermoplastic elastomer are preferable. These thermoplastic elastomer resins can be used alone or in combination of two or more.

The characteristics of the elastic plug 11 are not particularly limited, and may be sufficient as long as it has a hardness enough to allow a medical injection needle or the like to penetrate. Further, it is preferable that the shape retainability is such that it is not easily deformed or damaged during normal storage. The hardness of the elastic plug 11 is preferably A5 to A50, more preferably A10 to A45 in the measurement by the JIS K6253 method.

The outer frame body 12 includes at least a main body portion 12a having a substantially cylindrical overall shape and a flange portion 12b for joining. The main body portion 12a includes an upper main body portion 121 that is heat-welded to the upper side peripheral portion 113a of the elastic plug 11, a lower main body portion 122 that is thinner than the upper main body portion 121, and the upper main body portion 121. It has a step 123 connecting the lower portion 122 of the main body. The diameters of the upper part 121 of the main body and the lower part 122 of the main body are substantially the same. The inner peripheral surface of the main body upper portion 121 is heat-welded to the side peripheral portion upper portion 113a of the elastic plug body 11. Further, an annular overhanging portion 124 is provided at the end of the upper portion 121 of the main body portion, and the overhanging portion 124 is heat-welded to the peripheral edge portion 111a of the top surface portion 111 of the elastic plug body 11. On the other hand, the lower portion 122 of the main body and the step 123 are not in contact with the elastic plug 11. The joining flange portion 12b is provided at the end of the main body portion 12a and is used for joining with the mouth portion of the drug container (details will be described later).

As the material constituting the outer frame body 12, any synthetic resin having established safety for medical use is sufficient. Of these, it is common to use a thermoplastic resin. Specifically, resins conventionally used for medical applications such as polyethylene, polypropylene, polyester, polyvinyl chloride, polyolefin, and polyethylene terephthalate resin are preferable. These can be used alone or in combination of two or more.

Next, a case where the medical cap 10 of the present embodiment is applied to a drug container such as an infusion container will be described. As shown in FIG. 1 (b), the mouth portion 14 of the drug container has a substantially cylindrical shape as a whole, and has an annular collar 14a on the outer peripheral surface. When the medical cap 10 is attached to the mouth portion 14, the joining flange portion 12b of the outer frame body 12 and the annular flange portion 14a of the mouth portion 14 are joined by a method such as ultrasonic welding or heat welding. The constituent material of the mouth portion 14 is not particularly limited, and for example, the same constituent material as that of the outer frame body 12 can be adopted.

[Manufacturing method of medical cap]
Next, a method for manufacturing the medical cap according to the present embodiment will be described with reference to FIG. FIG. 3 is a schematic cross-sectional view for explaining a method for manufacturing a medical cap, and FIG. 3A shows a state in which a pair of molds are closed to form a cavity for forming an elastic stopper. The figure (b) shows how the mold is opened after the elastic stopper is molded, the figure (c) shows the state of molding the outer frame, and the figure (d) shows the molding. Represents a later medical cap.

The method for manufacturing a medical cap according to the present embodiment uses a two-color molding method, and includes an elastic stopper molding step for molding the elastic stopper 11 and an outer frame for holding the elastic stopper 11 inside. It includes an outer frame body forming step of forming the body 12.

First, as shown in FIG. 3A, in the elastic stopper molding step, the elastic stopper 11 is injection-molded using the first mold 21 and the second mold 22. The first mold 21 is a core (male mold, movable side mold or lower mold), and the second mold 22 is a cavity (female mold, fixed side mold or upper mold). The first mold 21 and the second mold 22 have a structure in which a cavity 23 for forming an elastic plug 11 is formed when both are closed. Further, the position of the joint surface 212 formed by closing the first mold 21 and the second mold 22 is the parting line PL at the boundary between the upper side peripheral portion 113a of the elastic plug 11 and the engaged portion 114. Is set to be formed.

The first mold 21 has an engaging portion 211 capable of forming the engaged portion 114 of the elastic plug 11. The engaging portion 211 is formed of a concave portion forming convex portion in which an annular convex portion is provided on a cylindrical inner peripheral surface. This makes it possible to form an engaged portion 114 formed of an annular recess in the side peripheral portion 113 of the elastic plug body 11. Further, the inner peripheral surface of the engaging portion 211 and the inner side surface forming the side peripheral portion lower 113b and the bottom surface portion 112 of the elastic plug 11 are roughened, whereby the engaging portion 211 of the engaging portion 211 is subjected to roughening treatment. The inner peripheral surface and the like have a fine uneven structure. The roughening treatment method is not particularly limited, and examples thereof include grain processing such as blast shot, etching, and electric discharge machining. The entire inner surface of the second mold 22 (the surface forming the upper side peripheral portion 113a and the top surface portion 111 of the elastic plug 11) is also provided with a fine uneven structure by roughening treatment. However, when the surfaces of the elastic stopper 11 above the side peripheral portion 113a and the top surface portion 111 are flattened, it is preferable that the inner side surface of the second mold 22 is also smoothed.

The elastic plug 11 is formed by injecting a molten resin obtained by melting a resin that is a constituent material of the elastic plug 11 into a cavity 23 for forming the elastic plug. After the molten resin is injected, it is cooled, whereby the elastic plug 11 provided with the engaged portion 114 can be formed. Further, a fine uneven structure is provided on the surfaces of the engaged portion 114 and the lower peripheral portion 113b of the molded elastic plug 11. Since the inner peripheral surface of the engaging portion 211 of the first mold 21 and the inner side surface of the second mold 22 are provided with a fine uneven structure, when the elastic stopper 11 is molded, the elastic plug 11 is formed. The air in the cavity 23 can be discharged to the outside, and the function as an air vent can be exhibited.

The injection pressure of the molten resin is not particularly limited and may be appropriately set as needed. The injected molten resin is cooled in the cavity 23 for forming an elastic plug. The cooling time is not particularly limited and may be set as needed.

Next, as shown in FIG. 3B, the first mold 21 and the second mold 22 are opened. At this time, the elastic plug 11 is fixed to the first mold 21 by engaging the engaged portion 114 with the engaging portion 211 of the first mold 21. Further, the surface of the engaged portion 114 and the lower peripheral portion 113b of the elastic plug 11 is provided with a fine uneven structure, and the first mold 21 is further engaged with the engaged portion 114. A fine uneven structure is also provided on the inner peripheral surface of the engaging portion 211 of the above. Therefore, the engagement between the engaged portion 114 and the engaging portion 211 is difficult to be easily disengaged. Moreover, since the uneven structure of the inner surface of the second mold 22 has a smaller degree of unevenness than the uneven structure of the engaging portion 211 of the first mold 21, the elastic plug 11 and the second mold 22 It is easy to release the mold. As a result, in the present embodiment, when the first mold 21 and the second mold 22 are opened, the elastic stopper 11 comes into close contact with the second mold 22 and a mold release defect occurs. Can be prevented. As a result, it is possible to prevent a decrease in manufacturing efficiency.

Subsequently, as shown in FIG. 3C, an outer frame body forming step is performed. This step is performed in a state where the elastic plug 11 is fixed to the first mold 21. Further, this step is performed using a first mold 21 and a fourth mold 25 capable of forming a cavity 24 for forming an outer frame by closing the mold 21 with the first mold 21. Therefore, the first mold 21 functions as a common mold (third mold) applicable to the molding of the outer frame body 12. Specifically, in a state where the elastic plug 11 is housed inside, a molten resin obtained by melting a resin that is a constituent material of the outer frame 12 is injected into a cavity 24 for forming the outer frame. The injection pressure of the molten resin is not particularly limited and may be appropriately set as needed. The injected molten resin is cooled in a closed state. The cooling time is not particularly limited and may be set as needed.

After opening the molds of the first mold 21 and the fourth mold 25, as shown in FIG. 3D, an outer frame body 12 holding the elastic plug 11 inside is obtained. Further, the outer frame body 12 is heat-welded on the contact surface with the elastic plug body 11.

From the above, the medical cap 10 according to the present embodiment can be manufactured. According to the method for manufacturing a medical cap of the present embodiment, in the elastic stopper forming step, the engaged portion 114 is formed on the elastic stopper 11 by using the first mold 21 having the engaging portion 211. The first mold 21 and the second mold 22 are opened in a state where the engaged portion 114 is engaged with and fixed to the engaging portion 211 of the first mold 21. Therefore, it is possible to prevent the elastic plug 11 from being left behind in the second mold 22 which is a cavity. As a result, it is possible to provide a method for manufacturing a medical cap in which a decrease in manufacturing efficiency is suppressed.

[Other matters]
In the present embodiment, the embodiment in which the side peripheral portion 113 is provided with the engaged portion 114 composed of the annular recess is described as an example of the elastic plug, but the present invention is not limited thereto. For example, the elastic plug body having the shapes shown in FIGS. 4 to 11 can be appropriately changed.

For example, in the present invention, as shown in FIGS. 4A and 4B, an engaged portion 132 made of an annular recess is provided on the peripheral edge portion (end portion of the side peripheral portion 113) of the bottom surface portion 112. It may be an elastic plug 131. The engaged portion 132 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 131 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It has a vertical cross-sectional shape. As a result, the engaged portion 132 of the elastic plug 131 can be firmly engaged with the engaging portion of the first mold 21, and the elastic plug 131 is further prevented from being disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 131 having such a shape, the parting line PL is provided on the top surface portion 111 side above the engaged portion 132.

The engaging portion of the first mold 21 that engages with the engaged portion 132 has a vertical cross-sectional shape that tapers in a direction away from the second mold 22 that closes the mold. Further, the surface of the engaged portion 132 may have a fine uneven structure so that the engaged portion 132 of the elastic plug 131 is more firmly engaged with the engaging portion of the first mold 21. Further, the surface of the side peripheral portion 113 may be provided with a function as an air vent by forming the surface of the side peripheral portion 113 into a fine uneven structure. In this case, by forming the surface of the side peripheral portion 113 into an uneven structure having a smaller degree of unevenness than the uneven structure of the engaged portion 132, the elastic plug 131 becomes the second mold 22 at the time of mold opening. It is possible to further prevent the occurrence of mold release defects due to close contact.

Further, as shown in FIGS. 5 (a) and 5 (b), the present invention is elastic with an engaged portion 134 made of an annular recess in the lower side peripheral portion 113b having a larger diameter than the upper side peripheral portion 113a. It may be a plug 133. Even in such a case, the engaged portion 134 of the elastic stopper body 133 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 133 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 133 having such a shape, it is preferable that the parting line PL is provided at the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b. However, the present invention is not limited to this aspect with respect to the position of the parting line PL, and the present invention is at an arbitrary position between the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b and the engaged portion 134. It is possible to provide.

The engaging portion of the first mold 21 that forms the engaged portion 134 on the elastic plug 133 and makes it engageable with the engaged portion 134 is composed of an annular concave portion forming convex portion. .. Further, the engaged portion 134 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 133 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It may have a vertical cross-sectional shape (tapered). Further, the surface of the engaged portion 134 may have a fine uneven structure so that the engaged portion 134 of the elastic plug 133 is more firmly engaged with the engaging portion of the first mold 21. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into a concave-convex structure having a smaller degree of unevenness than the concave-convex structure of the engaged portion 134, the elastic stopper 133 is used as the second mold 22 at the time of mold opening. It is possible to further prevent the mold release defect from occurring due to close contact with the mold.

Further, in the present invention, as shown in FIGS. 6A and 6B, an engaged portion 136 composed of an annular recess is provided on the peripheral edge portion of the bottom surface portion 112 (the end portion of the side peripheral portion lower 113b). It may be an elastic plug body 135. The engaged portion 136 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 135 is engaged with the first mold 21, the tapered portion is tapered in a direction away from the first mold 21). It has a vertical cross-sectional shape. Even in such a case, the engaged portion 136 of the elastic stopper body 135 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 135 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 135 having such a shape, it is preferable that the parting line PL is provided at the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b. However, the present invention is not limited to this aspect with respect to the position of the parting line PL, and at an arbitrary position between the boundary between the upper side peripheral portion 113a and the lower peripheral portion 113b and the engaged portion 136. It is possible to provide.

The engaging portion of the first mold 21 that engages with the engaged portion 136 has a vertical cross-sectional shape that tapers in a direction away from the second mold 22 that closes the mold. Further, the surface of the engaged portion 136 may have a fine uneven structure so that the engaged portion 136 of the elastic plug body 135 may be more firmly engaged with the engaging portion of the first mold 21. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into an uneven structure having a smaller degree of unevenness than the uneven structure of the engaged portion 136, the elastic plug body 135 is used as the second mold 22 at the time of mold opening. It is possible to further prevent the mold release defect from occurring due to close contact with the mold.

Further, as shown in FIGS. 7 (a) and 7 (b), the present invention may be an elastic plug 137 provided with an engaged portion 138 formed of an annular convex portion on the side peripheral portion 113. Even in such a case, the engaged portion 138 of the elastic stopper 137 can be engaged with the engaging portion of the first mold 21, and the elastic stopper 137 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 137 having such a shape, the parting line PL is provided on the top surface portion 111 side above the engaged portion 138.

The engaging portion of the first mold 21 that forms the engaged portion 138 on the elastic plug 137 and makes it engageable with the engaged portion 138 is from the annular convex portion forming cavity portion. Become. Further, the engaged portion 138 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 137 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It may have a vertical cross-sectional shape (tapered). Further, the surface of the engaged portion 138 may have a fine uneven structure so that the engaged portion 138 of the elastic plug 137 is more firmly engaged with the engaging portion of the first mold 21. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into a concave-convex structure having a smaller degree of unevenness than the concave-convex structure of the engaged portion 138, the elastic plug 137 becomes the second mold 22 at the time of mold opening. It is possible to further prevent the mold release defect from occurring due to close contact with the mold.

Further, in the present invention, as shown in FIGS. 8A and 8B, an engaged portion 140 made of a flange portion is provided on the peripheral edge portion (end portion of the side peripheral portion 113) of the bottom surface portion 112. It may be an elastic plug body 139. Even in such a case, the engaged portion 140 of the elastic stopper body 139 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 139 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 139 having such a shape, the parting line PL is provided on the top surface portion 111 side above the engaged portion 140.

The engaging portion of the first mold 21 that forms the engaged portion 140 on the elastic plug body 139 and makes it engageable with the engaged portion 140 is from the annular flange portion forming cavity portion. Become. Further, the engaged portion 140 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 139 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It may have a vertical cross-sectional shape (tapered). Further, the surface of the engaged portion 140 may have a fine uneven structure so that the engaged portion 140 of the elastic plug 139 is more firmly engaged with the engaging portion of the first mold 21. Further, the surface of the side peripheral portion 113 may be provided with a function as an air vent by forming the surface of the side peripheral portion 113 into a fine uneven structure. In this case, by forming the surface of the side peripheral portion 113 into an uneven structure having a smaller degree of unevenness than the uneven structure of the engaged portion 140, the elastic plug 139 becomes the second mold 22 at the time of mold opening. It is possible to further prevent the occurrence of mold release defects due to close contact.

Further, as shown in FIGS. 9 (a) and 9 (b), the present invention is provided with an engaged portion 142 composed of an annular convex portion at the lower side peripheral portion 113b having a diameter larger than the upper side peripheral portion 113a. It may be an elastic plug 141. Even in such a case, the engaged portion 142 of the elastic stopper body 141 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 141 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 141 having such a shape, it is preferable that the parting line PL is provided at the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b. However, the present invention is not limited to this aspect with respect to the position of the parting line PL, and at an arbitrary position between the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b and the engaged portion 142. It is possible to provide.

The engaging portion of the first mold 21 that forms the engaged portion 142 on the elastic plug 141 and makes it engageable with the engaged portion 142 is composed of an annular concave portion forming convex portion. .. Further, the engaged portion 142 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 141 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It may have a vertical cross-sectional shape (tapered). Further, the surface of the engaged portion 142 may have a fine uneven structure so that the engaged portion 142 of the elastic plug 141 may be more firmly engaged with the engaging portion of the first mold 21. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into a concave-convex structure having a smaller degree of unevenness than the concave-convex structure of the engaged portion 142, the elastic stopper 141 is used as the second mold 22 at the time of mold opening. It is possible to further prevent the mold release defect from occurring due to close contact with the mold.

Further, in the present invention, as shown in FIGS. 10 (a) and 10 (b), an engaged portion 144 made of a flange portion is provided on the peripheral edge portion (end portion of the side peripheral portion 113) of the bottom surface portion 112. It may be an elastic plug body 143. Even in such a case, the engaged portion 144 of the elastic stopper body 143 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 143 can be disengaged from the first mold 21. Can be regulated. Further, in the case of the elastic plug body 143 having such a shape, it is preferable that the parting line PL is provided at the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b. However, the present invention is not limited to this aspect with respect to the position of the parting line PL, and at an arbitrary position between the boundary between the upper side peripheral portion 113a and the lower peripheral portion 113b and the engaged portion 144. It is possible to provide.

The engaging portion of the first mold 21 that forms the engaged portion 144 on the elastic plug body 143 and makes it engageable with the engaged portion 144 is from the annular flange portion forming cavity portion. Become. Further, the engaged portion 144 has a tapered shape that tapers toward the top surface portion 111 (in a state where the elastic stopper 143 is engaged with the first mold 21, it tapers in a direction away from the first mold 21). It may have a vertical cross-sectional shape (tapered). Further, the surface of the engaged portion 144 may have a fine uneven structure so that the engaged portion 144 of the elastic plug 143 may be more firmly engaged with the engaging portion of the first mold 21. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into a concave-convex structure having a smaller degree of unevenness than the concave-convex structure of the engaged portion 144, the elastic stopper 143 is used as the second mold 22 at the time of mold opening. It is possible to further prevent the mold release defect from occurring due to close contact with the mold.

Further, as shown in FIGS. 11 (a) and 11 (b), the present invention has a tapered shape (in a state where the elastic stopper 145 is engaged with the first mold 21) toward the top surface portion 111. , The elastic plug body 145 may be provided with an engaged portion having a vertical cross-sectional shape of 113b'below the side peripheral portion, which is tapered in the direction away from the first mold 21. Even in such a case, the engaged portion of the elastic stopper body 145 can be engaged with the engaging portion of the first mold 21, and the elastic stopper body 145 is restricted from being disengaged from the first mold 21. can do. Further, in the case of the elastic plug body 145 having such a shape, the parting line PL is provided at the boundary between the upper side peripheral portion 113a and the lower side peripheral portion 113b'.

It should be noted that the engaging portion of the first mold 21 that forms an engaged portion consisting of the lower side peripheral portion 113b'on the elastic plug body 145 and makes it engageable with the engaged portion is closed. It has a vertical cross-sectional shape that tapers in the direction away from the second mold 22. Further, the surface of the lower side peripheral portion 113b'has a fine uneven structure, and the lower side peripheral portion 113b', which is the engaged portion of the elastic plug 145, is more firmly engaged with the engaging portion of the first mold 21. You may let it. Further, by forming the surface of the upper side peripheral portion 113a into a fine uneven structure, the surface of the upper side peripheral portion 113a may also be provided with a function as an air vent. In this case, by forming the surface of the upper side peripheral portion 113a into an uneven structure having a smaller degree of unevenness than the uneven structure of the lower side peripheral portion 113b', the elastic plug 145 becomes the second mold at the time of mold opening. It is possible to further prevent the mold release defect from occurring in close contact with 22.

(Embodiment 2)
The medical cap according to the second embodiment of the present invention and a method for manufacturing the same will be described below.
The second embodiment is different from the first embodiment in that the insert molding method is used instead of the two-color molding method. Also by such a method, in the present embodiment, it is possible to provide a method for manufacturing a medical cap in which a decrease in manufacturing efficiency is suppressed.

[Medical cap]
The medical cap according to the second embodiment has the same configuration as the medical cap 10 according to the first embodiment (see FIG. 12 (e)). Therefore, the description thereof will be omitted with the same reference numerals.

[Manufacturing method of medical cap]
Next, the method for manufacturing the medical cap according to the second embodiment will be described below with reference to FIG.
FIG. 12 is a schematic cross-sectional view for explaining the method for manufacturing the medical cap, and FIG. 12A shows a pair of molds being closed to form a cavity for forming an elastic stopper. (B) shows how the mold is opened after the elastic stopper is molded, and FIG. 3C shows how the elastic stopper is inserted into another mold. The figure (d) shows the state of molding the outer frame body, and the figure (e) shows the medical cap after molding. In the present embodiment, the outer frame body forming steps shown in FIGS. 12 (d) and 12 (e) are the same as those in the first embodiment, and thus the description thereof will be omitted.

The method for manufacturing a medical cap according to the present embodiment uses an insert molding method, and is a step of forming an elastic stopper body 11 for forming an elastic stopper body 11 and an external insertion of the elastic stopper body into a mold. It includes an outer frame body forming step of forming a frame body.

First, as shown in FIG. 12A, in the elastic stopper molding step, the elastic stopper 11 is injection-molded using the first mold 27 and the second mold 28. The first mold 27 is a core (male mold, movable side mold or lower mold), and the second mold 28 is a cavity (female mold, fixed side mold or upper mold). The first mold 27 and the second mold 28 have a structure in which a cavity 23 for forming an elastic plug 11 is formed when both are closed. Further, the position of the joint surface 272 formed by closing the first mold 27 and the second mold 28 is the parting line PL at the boundary between the upper side peripheral portion 113a of the elastic plug 11 and the engaged portion 114. Is set to be formed.

The first mold 27 has an engaging portion 271 capable of forming the engaged portion 114 of the elastic plug 11. The engaging portion 271 is formed of a concave portion forming convex portion in which an annular convex portion is provided on a cylindrical inner peripheral surface. This makes it possible to form an engaged portion 114 formed of an annular recess in the side peripheral portion 113 of the elastic plug body 11. Further, the inner peripheral surface of the engaging portion 271 and the inner side surface forming the side peripheral portion lower 113b and the bottom surface portion 112 of the elastic plug 11 are roughened, whereby the engaging portion 271 is subjected to roughening treatment. The inner peripheral surface has a fine uneven structure. The roughening treatment method is the same as that described in the first embodiment. The inner surface of the second mold 28 is also provided with a fine uneven structure by roughening treatment. However, when the surfaces of the elastic stopper 11 above the side peripheral portion 113a and the top surface portion 111 are flattened, it is preferable that the inner surface of the second mold 28 is also smoothed.

The elastic plug 11 can be molded by injection molding as in the case of the first embodiment. Further, in the present embodiment, the elastic plug 11 may be produced by compression molding. In this case, the elastic stopper 11 can be obtained by putting a pre-weighed molding material into a mold (cavity) and pressurizing it with a compression molding machine to cure it. Since the inner peripheral surface of the engaging portion 271 of the first mold 27 and the inner side surface of the second mold 28 are provided with a fine uneven structure, when the elastic plug 11 is molded, it is necessary to form the elastic stopper body 11. The air in the cavity 23 can be discharged to the outside, and the function as an air vent is exhibited.

Next, as shown in FIG. 12B, the first mold 27 and the second mold 28 are opened. At this time, the elastic plug 11 is fixed to the first mold 27 by engaging the engaged portion 114 with the engaging portion 271 of the first mold 27. Further, the surface of the engaged portion 114 and the lower peripheral portion 113b of the elastic plug 11 is provided with a fine uneven structure, and the engaging portion 271 engaged with the engaged portion 114 is further provided. A fine uneven structure is also provided on the inner peripheral surface. Therefore, the engagement between the engaged portion 114 and the engaging portion 271 is difficult to be easily disengaged. Moreover, since the uneven structure of the inner surface of the second mold 28 has a smaller degree of unevenness than the uneven structure of the engaging portion 211 of the first mold 21, the elastic plug 11 and the second mold 28 It is easy to release the mold. As a result, in the present embodiment, it is possible to prevent the occurrence of mold release failure of the elastic stopper 11 when the first mold 27 and the second mold 28 are opened, and to suppress a decrease in manufacturing efficiency. Can be done.

Subsequently, as shown in FIG. 12 (c), the elastic plug 11 is loaded into the third mold 29. The third mold 29 includes an engaging portion (another engaging portion) 291 having the same shape as the engaging portion 271 of the first mold 27. Further, the third mold 29 has an internal structure capable of forming a cavity 24 for forming an outer frame by closing the mold with the fourth mold 25, and is basically carried out. This is the same as the first mold 21 in the first form.

The elastic stopper 11 is loaded into the third mold 29 so that the engaged portion 114 of the elastic stopper 11 engages with the engaging portion 291 of the third mold 29. As a result, the elastic plug 11 can be fixed to the third mold 29. After that, the third mold 29 and the fourth mold 25 are closed, and the outer frame body 12 is injection-molded in the same manner as in the first embodiment.

From the above, the medical cap 10 according to the present embodiment can be manufactured. According to the method for manufacturing a medical cap of the present embodiment, in the elastic stopper forming step, the engaged portion 114 is formed on the elastic stopper 11 by using the first mold 27 having the engaging portion 271. The first mold 27 and the second mold 28 are opened in a state where the engaged portion 114 is engaged with and fixed to the engaging portion 271 of the first mold 27. Therefore, it is possible to prevent the elastic plug 11 from being left behind in the second mold 28 which is a cavity. Further, in the outer frame body forming step, by using the third mold 29 having the engaging portion 291 having the same shape as the engaging portion 271 of the first mold 27, the elastic stopper inserted in the step is also used. The outer frame body 12 can be molded with the 11 fixed to the third mold 29. Therefore, it is possible to prevent the elastic plug 11 from being displaced after the insertion and to suppress a decrease in manufacturing efficiency.

[Other matters]
In the present embodiment, the embodiment in which the side peripheral portion 113 is provided with the engaged portion 114 composed of the annular recess is described as an example of the elastic plug, but the present invention is not limited thereto. For example, it is possible to use the elastic plugs shown in FIGS. 4 to 11 described above.

(Embodiment 3)
The medical cap according to the third embodiment of the present invention and a method for manufacturing the same will be described below.
The third embodiment is different from the first and second embodiments in that an elastic plug having an engaged portion provided on the bottom surface thereof is used. Further, the molds used in the elastic plug body forming step and the outer frame body forming step are also different.

[Medical cap]
The medical cap according to the third embodiment will be described below with reference to FIG. The components having the same functions as those of the first and second embodiments are designated by the same reference numerals and detailed description thereof will be omitted. FIG. 13 is a schematic cross-sectional view showing the medical cap according to the third embodiment.

As shown in FIG. 13, the medical cap 20 of the present embodiment has at least an elastic plug 31 and an outer frame 32 that holds the elastic plug 31 inside.

The overall shape of the elastic plug 31 is substantially cylindrical as shown in FIG. However, the present invention is not limited to this, and may be, for example, a substantially truncated cone shape. In addition, various shapes described later can be adopted. There is no parting line on the side peripheral portion 113 of the elastic plug body 31.

The bottom surface portion 112 of the elastic plug body 31 is provided with an engaged portion 33 for engaging the elastic plug body 31 with the mold. Thereby, for example, after the elastic plug 31 is molded, the molded elastic plug 31 can be engaged with and fixed to the mold when the mold is opened. The engaged portion 33 is a peripheral edge portion 112a of the bottom surface portion 112, and is provided at a position separated from the inner wall surface of the main body portion 31 of the outer frame body 32 by a certain distance.

The engaged portion 33 is formed of an annular recess. The depth h and width d (see FIG. 13) of the engaged portion 33 are not particularly limited as long as the elastic plug 31 can be engaged and fixed to the mold, and can be appropriately set. .. The height and diameter of the elastic plug 31 are not particularly limited, and can be appropriately set as needed.

A fine uneven structure is provided on the inner wall surface of the engaged portion 33 formed of the annular recess. The engaged portion 33 becomes a contact surface with the mold when it is engaged with the mold and the elastic plug 31 is fixed to the mold. Therefore, by making the inner wall surface of the engaged portion 33 a fine uneven structure, the frictional resistance at the contact surface with the mold can be increased and the engagement with the mold can be strengthened. The surface of the bottom surface portion 112 of the elastic plug 31 may also be provided with a fine uneven structure.

A fine uneven structure is also provided on the surface of the side peripheral portion 113 of the elastic plug body 31. The entire surface of the side peripheral portion 113 is heat-welded to the inner wall surface of the main body portion 31a of the outer frame body 32. As a result, it is possible to prevent the elastic plug 31 from falling off from the outer frame 32, and to prevent the generation of voids due to the misalignment between the elastic plug 31 and the outer frame 32 during needle sticking. As a result, it is possible to improve the airtightness, prevent leakage of chemicals and infusions, and prevent deterioration due to contact with air. The surface of the side peripheral portion 113 may be smooth.

The outer frame body 32 includes at least a main body portion 31a having a substantially cylindrical overall shape and a flange portion 12b for joining. The inner peripheral surface of the main body portion 31a is heat-welded to the entire surface of the side peripheral portion 113 of the elastic plug body 31. Further, an annular overhanging portion 124 is provided at the end of the main body portion 31, and the overhanging portion 124 is heat-welded to the peripheral edge portion 111a of the top surface portion 111 of the elastic plug 31.

The constituent materials of the elastic plug 31 and the outer frame 32 are the same as in the case of the first embodiment.

Next, a case where the medical cap 20 of the present embodiment is applied to a drug container such as an infusion container will be described. As shown in FIG. 13B, the mouth portion 15 of the drug container has a substantially cylindrical shape as a whole, and has an annular collar 15a on the outer peripheral surface. When the medical cap 20 is attached to the mouth 15, the tip 15b of the mouth 15 is inserted through the opening on the bottom surface 112 side of the medical cap 20. At this time, the tip portion 15b of the mouth portion 15 may press the bottom surface portion 112 of the elastic plug 31. Further, the flange portion 12b of the outer frame body 32 and the annular flange 15a of the mouth portion 15 are joined by a method such as ultrasonic welding or heat welding. The constituent material of the mouth portion 15 is not particularly limited, and for example, the same constituent material as that of the outer frame body 12 can be adopted.

[Manufacturing method of medical cap]
Next, the method for manufacturing the medical cap according to the third embodiment will be described below with reference to FIG.
FIG. 14 is a schematic cross-sectional view for explaining the method for manufacturing the medical cap, and FIG. 14A shows a pair of molds being closed to form a cavity for forming an elastic stopper. (B) shows how the mold is opened after the elastic stopper is molded, (c) shows how the outer frame is molded, and (d) shows how the outer frame is molded. Represents a medical cap after molding.

The method for manufacturing a medical cap according to the present embodiment uses a two-color molding method, and includes an elastic stopper molding step for molding the elastic stopper 31 and an outer frame for holding the elastic stopper 31 inside. It includes an outer frame body forming step of forming the body 32.

First, as shown in FIG. 14A, in the elastic stopper molding step, the elastic stopper 31 is injection-molded using the first mold 41 and the second mold 42. The first mold 41 is a core (male mold, movable side mold or lower mold), and the second mold 42 is a cavity (female mold, fixed side mold or upper mold). The first mold 41 and the second mold 42 have a structure in which a cavity 43 for forming an elastic plug 31 is formed when both are closed. Further, the position of the joint surface 412 formed by closing the first mold 41 and the second mold 42 is set to be lower than the bottom surface portion 112 of the elastic plug 11.

The first mold 41 has an engaging portion 411 capable of forming the engaged portion 33 of the elastic plug 31. The engaging portion 411 is formed of a convex portion for forming a concave portion, in which a substantially circular ridge portion is provided on the mounting portion on which the elastic plug 31 is placed. This makes it possible to form an engaged portion 33 formed of an annular recess on the bottom surface portion 112 of the elastic plug body 11. Further, the surface of the engaging portion 411 may be roughened. As a result, the surface of the engaging portion 411 has a fine uneven structure. The roughening treatment method is not particularly limited, and examples thereof include grain processing such as blast shot and etching. The inner surface of the second mold 42 is also provided with a fine uneven structure by roughening treatment. However, when the surfaces of the side peripheral portion 113 and the top surface portion 111 of the elastic plug 11 are flattened, it is preferable that the inner side surface of the second mold 42 is also smoothed.

The elastic plug 31 is formed by injecting a molten resin obtained by melting a resin that is a constituent material of the elastic plug 31 into a cavity 43 for forming the elastic plug. After the molten resin is injected, it is cooled, whereby the elastic plug 31 provided with the engaged portion 33 can be formed. The injection conditions and cooling conditions of the molten resin are the same as those in the first embodiment. Since the inner peripheral surface of the engaging portion 411 of the first mold 41 and the inner surface of the second mold 42 are provided with a fine concavo-convex structure, when the elastic stopper 11 is molded, the elastic plug 11 is formed. The air in the cavity 43 can be discharged to the outside, and the function as an air vent is exhibited.

Next, as shown in FIG. 14B, the first mold 41 and the second mold 42 are opened. At this time, the elastic plug 11 is fixed to the first mold 41 by engaging the engaged portion 33 with the engaging portion 411 of the first mold 41. Further, the inner wall surface of the engaged portion 33 of the elastic plug 31 is provided with a fine uneven structure, and the surface of the engaging portion 411 engaged with the engaged portion 33 is also fine. An uneven structure is provided. Therefore, the engagement between the engaged portion 33 and the engaging portion 411 is difficult to be easily disengaged. Moreover, since the uneven structure of the inner surface of the second mold 42 has a smaller degree of unevenness than the uneven structure of the engaging portion 411 of the first mold 41, the elastic plug 31 and the second mold 42 It is easy to release the mold. As a result, in the present embodiment, when the first mold 41 and the second mold 42 are opened, it is possible to prevent a mold release defect of the elastic stopper 31 from occurring, resulting in a decrease in manufacturing efficiency. It can be suppressed.

Subsequently, as shown in FIG. 14 (c), an outer frame body forming step is performed. This step is performed in a state where the elastic plug 31 is fixed to the first mold 41. Further, this step is performed using a first mold 41 and a fourth mold 44 capable of forming a cavity 45 for forming an outer frame by closing the mold with the first mold 41. Therefore, the first mold 41 functions as a common mold (third mold) that can also be applied to the molding of the outer frame body 42. Specifically, with the elastic stopper 31 housed inside, a molten resin obtained by melting a resin that is a constituent material of the outer frame 32 is injected into a cavity 45 for forming the outer frame. The injection conditions and cooling conditions of the molten resin are the same as in the case of the first embodiment.

After opening the molds of the first mold 41 and the fourth mold 44, as shown in FIG. 14D, an outer frame body 32 holding the elastic plug 31 inside is obtained. Further, the outer frame body 32 is heat-welded on the contact surface with the elastic plug body 31.

As described above, the medical cap 20 according to the present embodiment can be manufactured. According to the method for manufacturing a medical cap according to the present embodiment, in the elastic stopper forming step, the engaged portion 33 is formed on the elastic stopper 31 by using the first mold 41 having the engaging portion 411. In a state where the engaged portion 33 is engaged with and fixed to the engaging portion 411 of the first mold 41, the first mold 41 and the second mold 42 are opened. Therefore, it is possible to prevent the elastic plug 31 from being left behind in the second mold 42, which is a cavity. As a result, it is possible to provide a method for manufacturing a medical cap in which a decrease in manufacturing efficiency is suppressed.

[Other matters]
In the present embodiment, the embodiment in which the bottom surface portion 112 is provided with the engaged portion 33 having an annular recess as an example has been described as an example, but the present invention is not limited thereto. For example, the elastic plug body having the shapes shown in FIGS. 15 to 17 can be appropriately changed as needed.

For example, as shown in FIGS. 15 (a) and 15 (b), the present invention is an elastic plug 131 provided with an engaged portion 312 having an opening provided in the central portion of the bottom surface portion 112. May be good. Even in such a case, the engaged portion 312 of the elastic stopper body 311 can be engaged with the engaging portion of the first mold 41, and the elastic stopper body 311 can be disengaged from the first mold 41. Can be regulated.

The engaging portion of the first mold 41 that forms the engaged portion 312 on the elastic plug 311 and makes it engageable with the engaged portion 312 is from a cylindrical concave portion forming convex portion. Become. Further, the inner wall surface of the engaged portion 312 is tapered toward the top surface portion 111 (when the elastic stopper 311 is engaged with the first mold 41, the inner wall surface is separated from the first mold 41. It may have a vertical cross-sectional shape that is tapered in the direction). Further, the inner wall surface of the engaged portion 312 may have a fine uneven structure, and the engaged portion 312 of the elastic plug 311 may be more firmly engaged with the engaging portion of the first mold 41. Further, the surface of the side peripheral portion 113 may be provided with a function as an air vent by forming the surface of the side peripheral portion 113 into a fine uneven structure. In this case, by forming the surface of the side peripheral portion 113 into an uneven structure having a smaller degree of unevenness than the uneven structure of the inner wall surface of the engaged portion 312, the elastic plug 311 becomes a second metal at the time of mold opening. It is possible to further prevent the mold 42 from being in close contact with the mold and causing a mold release defect.

Further, as shown in FIGS. 16 (a) and 16 (b), the present invention is an elastic plug body 313 provided with a side peripheral lower portion 113b having a diameter larger than that of the side peripheral portion upper 113a, and is annular to the bottom surface portion 112. An engaged portion 314 made of a recess may be provided. Even in such a case, the engaged portion 314 of the elastic stopper body 313 can be engaged with the engaging portion of the first mold 41, and the elastic stopper body 313 can be disengaged from the first mold 41. Can be regulated.

The engaging portion of the first mold 41 having the engaged portion 314 formed on the elastic plug 313 and being engageable with the engaged portion 314 is composed of an annular concave portion forming convex portion. .. Further, the inner wall surface of the engaged portion 314 has a tapered shape (in a state where the elastic stopper 313 is engaged with the first mold 41, it approaches the first mold 41) toward the bottom surface portion 112. It may have a vertical cross-sectional shape that is tapered in the direction). Further, the inner wall surface of the engaged portion 314 may have a fine uneven structure, and the engaged portion 314 of the elastic plug 313 may be more firmly engaged with the engaging portion of the first mold 41. Further, the surface of the side peripheral portion 113 (the upper side peripheral portion 113a and the lower peripheral portion 113b) may have a fine uneven structure to impart a function as an air vent to the surface of the side peripheral portion 113. In this case, by forming the surface of the side peripheral portion 113 into an uneven structure having a smaller degree of unevenness than the uneven structure of the inner wall surface of the engaged portion 314, the elastic plug 313 becomes a second metal at the time of mold opening. It is possible to further prevent the mold 42 from being in close contact with the mold and causing a mold release defect.

Further, as shown in FIGS. 17 (a) and 17 (b), the present invention is the center of the bottom surface portion 112 in the elastic plug body 313 provided with the side peripheral portion lower portion 113b having a diameter larger than that of the side peripheral portion upper portion 113a. An engaged portion 312 having an opening provided in the portion may be provided. Even in such a case, the engaged portion 316 of the elastic stopper body 315 can be engaged with the engaging portion of the first mold 41, and the elastic stopper body 315 can be disengaged from the first mold 41. Can be regulated.

The engaging portion of the first mold 41 having the engaged portion 316 formed on the elastic stopper 315 and being engageable with the engaged portion 316 is from a cylindrical concave portion forming convex portion. Become. Further, the inner wall surface of the engaged portion 316 is tapered toward the top surface portion 111 (when the elastic stopper 315 is engaged with the first mold 41, the inner wall surface is separated from the first mold 41. It may have a vertical cross-sectional shape that is tapered in the direction). Further, the inner wall surface of the engaged portion 316 may have a fine uneven structure, and the engaged portion 316 of the elastic plug 315 may be more firmly engaged with the engaging portion of the first mold 41. Further, the surface of the side peripheral portion 113 (the upper side peripheral portion 113a and the lower peripheral portion 113b) may have a fine uneven structure to impart a function as an air vent to the surface of the side peripheral portion 113. In this case, by forming the surface of the side peripheral portion 113 into an uneven structure having a smaller degree of unevenness than the uneven structure of the inner wall surface of the engaged portion 316, the elastic plug 315 becomes a second metal at the time of mold opening. It is possible to further prevent the mold 42 from being in close contact with the mold and causing a mold release defect.

10, 20 Medical caps 11, 31, 131, 133, 135, 137, 139, 141, 143, 145, 311, 313, 315 Elastic stoppers 12, 32, 42 Outer frame 12a Main body 12b Joining flange 14,15 Mouth portion 14a Circular flange 15a Circular flange 15b Tip portion 21, 27, 41 First mold 22, 28, 32, 42 Second mold 23, 43 Cavities for forming elastic stoppers 24, 45 Outer frame Cavities for molding 25, 44 4th mold 29 3rd mold 31 Main body 31a Main body 33, 114, 132, 134, 136, 138, 140, 142, 144, 312, 314, 316 Engagement part 111 Top surface 111a Peripheral part 111b Needle piercing surface 112 Bottom part 112a Peripheral part 113 Side peripheral part 113a Side peripheral part upper 113b Side peripheral part lower side 121 Main body part upper part 122 Main body part lower part 123 Step 124 Overhanging part 211, 271, 291, 411 Joints 212, 272, 412 Joint surfaces

Claims (12)

A medical cap having an elastic plug body and an outer frame body that holds the elastic plug body inside.
The contact surface between the elastic plug body and the outer frame body is heat-welded.
At least at a position where the annular engaged portion for engaging the elastic stopper with the mold extends over the entire circumference only on the side peripheral portion of the elastic stopper and is separated from the bottom surface portion of the elastic stopper. There is one,
The surface of the side peripheral portion, or the surface of the side peripheral portion and the surface of the engaged portion, is a medical cap having a fine uneven structure. The medical cap according to claim 1, wherein the surface of the bottom surface of the elastic plug has a fine uneven structure. The medical cap according to claim 1 or 2, wherein a parting line is provided on the side peripheral portion of the elastic plug at an arbitrary position on the side opposite to the bottom surface portion with respect to the engaged portion. .. The medical cap according to claim 1 or 2, wherein a parting line is not provided on the side peripheral portion of the elastic plug. The medical cap according to any one of claims 1 to 4, wherein the engaged portion is at least one of a convex portion, a concave portion, and a flange portion. A method for manufacturing a medical cap having an elastic plug body and an outer frame body that internally holds the elastic plug body.
An elastic stopper is formed by closing a first mold provided with at least one annular engaging portion for forming an annular engaged portion on a side peripheral portion of the elastic stopper and the first mold. It comprises an elastic plug forming step of forming an elastic plug provided with at least one engaged portion using a second mold for forming a molding cavity.
The engaging portion of the first mold is formed at a position where the annular engaged portion covers the entire circumference only on the side peripheral portion of the elastic plug body and is separated from the bottom surface portion of the elastic plug body. As described above, it is provided on the inner wall surface of the first mold.
Further, in the inner wall surface of the first mold, the portion for forming the side peripheral portion of the elastic stopper, or the portion for forming the side peripheral portion of the elastic stopper and the engaging portion have fine irregularities. A method of manufacturing a medical cap having a structure. A fourth mold that forms a cavity for forming an outer frame by closing the third mold on which the elastic stopper produced in the elastic stopper molding step can be placed and the third mold. Further includes an outer frame body forming step of forming the outer frame body using and.
The third mold uses the first mold as a common mold, and is used as a common mold.
The outer frame forming step is performed in a state where the engaged portion of the elastic stopper is engaged with the engaging portion of the first mold and the elastic stopper after molding is fixed to the first mold. The method for manufacturing a medical cap according to claim 6 . A fourth mold that forms a cavity for forming an outer frame by closing the third mold on which the elastic stopper produced in the elastic stopper molding step can be placed and the third mold. Further includes an outer frame body forming step of forming the outer frame body using and.
The third mold includes another engaging portion capable of engaging the engaged portion of the elastic stopper.
In the outer frame molding step, the engaged portion of the elastic stopper is engaged with another engaging portion of the third mold, and the molded elastic stopper is fixed to the third mold. The method for manufacturing a medical cap according to claim 6 , wherein the method is performed in 1. The medical cap according to any one of claims 6 to 8 , wherein a fine concavo-convex structure is provided on a portion of the inner wall surface of the first mold that forms the bottom surface of the elastic stopper. Manufacturing method. Claim that the joint surface formed when the first mold and the second mold are closed is located on the side opposite to the bottom surface portion with respect to the forming position of the engaged portion of the elastic plug body. Item 6. The method for manufacturing a medical cap according to any one of Items 6 to 9 . Claimed that the joint surface formed when the first mold and the second mold are closed is located below the bottom surface portion with respect to the formation position of the engaged portion of the elastic plug body. The method for manufacturing a medical cap according to any one of 6 to 9 . The engaging portion of the first mold is a convex molding cavity for forming an engaged portion having a convex portion with respect to the elastic plug, and an engaged portion having a concave portion with respect to the elastic plug. 6 . The method for manufacturing a medical cap according to item 1.

Images