JPH0717547A - Rubber stopper and method and die for production thereof - Google Patents

Abstract

PURPOSE:To obtain a rubber stopper which cannot be easily uncorked from the mouth part of the bottle, and keeps a liquid such as chemicals in a bottle free from deterioration. CONSTITUTION:The surface of a leg part 2 extending downwards from a flange part 1a of a lid body 1 is covered with fluororesin film 3 and the upper part of the fluororesin film 3 is covered with a butyl rubber from the lid part 1 and the upper side faces 2a of the leg part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a rubber stopper which is mounted on a bottle to seal a chemical solution or a chemical product inside the bottle and avoid contact between the chemical solution and rubber and a rubber stopper, and a rubber stopper. The present invention relates to a manufacturing die.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Publication No. 57-53184 discloses a method for producing a laminated rubber stopper as a rubber stopper attached to a chemical solution storage bottle.

This "method for producing a laminated rubber stopper" is
"A lower die having a bottle insertion part molding recess is at least larger than the outer diameter of the finished product, and is sequentially polymerized with an unvulcanized butyl rubber sheet and a resin film having a property to withstand the medicine or medical drug to be packaged. The process of heating and pressurizing with a mold to form an element body whose lower surface is covered with a resin layer and whose upper surface is a rubber surface, and "the top end contact surface of the bottle mouth of the element body is
A step of forming a blank plug by cutting it to a width of 3 or less, and then "polymerizing an unvulcanized butyl rubber sheet on the upper surface of the blank plug loaded in the lower mold to make a bottle of a finished product. And the upper die having an enlarged head forming recess having the same diameter as the outer diameter of the upper end contact surface is heated and pressed to form a finished product.

In the case of the laminated rubber stopper manufactured by Japanese Patent Publication No. 57-53184, rubber is exposed on the upper surface of the stopper and the lower surface of the stopper is covered with a resin film.

If the inner edge of the mouth of the bottle is sharply pointed at a right angle, the tip of the rubber plug may be damaged when the rubber plug is inserted, and the rubber chips may fall into the bottle. The inner edge of the bottle mouth is usually rounded and chamfered. Therefore, the bottle mouth insertion portion and the bottle mouth upper end contact surface of the laminated rubber stopper are usually formed so as to be rounded in conformity with the chamfered shape of the inner edge portion of the bottle mouth portion.

[0006]

However, the Japanese Patent Publication No. 57-
When the resin film is attached to the peripheral surface of the leg like the laminated rubber plug of No. 53184, the surface of the resin film is slippery easily, so that the rubber plug is easily removed from the mouth of the bottle and the rubber plug Since the rubber plug easily comes off due to the repulsive force, the outer circumference of the cylindrical leg portion of the rubber plug often bulges outward in reality.

Therefore, in the "step of cutting the peripheral portion of the stopper with a width of at most 2/3 or less of the finished product", the leg portion of the stopper is used as a guide in order to avoid wrinkles of the resin film. A punching method using a cylindrical punch is used. Therefore, the planar projection shape of the leg portion becomes the punching shape of the peripheral edge portion of the plug.

However, when the unvulcanized rubber sheet is overlaid on the upper surface of the metal plug through the cutting process and the secondary processing is performed by heating and pressing, the peripheral portion of the resin film shrinks due to heating. As a result, the boundary between the bottle mouth insertion portion of the rubber stopper and the bottle upper end contact surface portion may be contracted.

When the peripheral edge of the resin film shrinks to the boundary between the bottle insertion portion and the bottle upper end contact surface in this manner, a gap is created between the resin film and the rubber, and the resin film and the rubber. There is a problem that the chemical solution enters through the gap between the and, the rubber dissolves in the chemical solution, and the chemical solution deteriorates.

[0010]

SUMMARY OF THE INVENTION The rubber stopper according to the present invention has been made by paying attention to such a problem, and is premised on that it is difficult to easily remove from the mouth of a bottle, An object is to provide a rubber stopper that does not deteriorate the liquid.

[0011]

In order to solve the above-mentioned problems, a rubber stopper according to claim 1 of the present invention has a top end peripheral portion of a fluorine resin film covering a surface portion inserted into the mouth of a bottle of a leg. Is extended from the boundary portion between the leg portion and the lid portion into the butyl rubber inside the lid portion and is sandwiched by the butyl rubber.

According to a second aspect of the present invention, in the method for manufacturing a rubber stopper, when the leg portion of the rubber stopper is inserted into the recess of the lower mold before the integral molding, the upper side surface of the leg portion is lower metal. A thin-walled structure that is exposed on the upper surface of the mold and has a gap between the upper portion of the side surface of the leg and the peripheral edge of the opening of the recess to provide an opening larger than the leg during the integral molding in the secondary step. Prepare an unvulcanized butyl rubber sheet and a thick unvulcanized butyl rubber sheet, and open the thin unvulcanized butyl rubber sheet when placing the thin unvulcanized butyl rubber sheet on the upper surface of the lower mold for the secondary process. It is characterized in that the legs are arranged inside the section so that the upper surface of the legs and the upper surface of the thin unvulcanized butyl rubber sheet have almost the same height, and then the thick unvulcanized butyl rubber sheet is placed to perform integral molding. And

A method for manufacturing a rubber stopper according to claim 3 of the present invention is
In the primary process, the fluorine resin film and the unvulcanized butyl rubber sheet are placed on the upper surface of the lower mold for the primary process and vulcanized, and after vulcanization, the portion of the butyl rubber sheet where the fluorine resin film projects in a cylindrical shape is separated. It is characterized in that it has a step of obtaining a leg portion.

A method for manufacturing a rubber stopper according to claim 4 of the present invention is
In the primary step, a step of forming a coating film of a fluorine rubber and a fluorine resin film on a non-vulcanized butyl rubber sheet through a primer layer, and a base metal for the primary step having a cavity for forming a tubular leg portion of a rubber stopper. It is characterized in that the unvulcanized butyl rubber sheet is placed on the upper surface of the mold with the barrier layer facing downward and vulcanized, and after the vulcanization, the portion protruding in a cylindrical shape is separated.

The method for manufacturing a rubber stopper according to claim 5 of the present invention is
The primary step of the method for producing a rubber stopper according to claim 2, wherein an aqueous coating layer is formed on an unvulcanized butyl rubber sheet via a primer layer, and the cavity has a cavity for forming a tubular leg portion of the rubber stopper. Fluorine resin film is mounted on the upper surface of the lower mold, and the unvulcanized butyl rubber sheet is mounted on the fluorine resin film with the water-based paint layer facing downward. By closing and vulcanizing, the vulcanized butyl rubber sheet is characterized in that the fluorine resin film layer side is projected in a tubular shape.

A method for manufacturing a rubber stopper according to claim 6 of the present invention is
The primary process of claim 2, wherein a fluorine resin film, a fluorine rubber sheet, and an unvulcanized butyl rubber sheet are attached from the bottom to the top of the lower mold for the primary process having a cavity for molding the cylindrical leg portion of the rubber stopper. It is characterized by being sequentially mounted on and vulcanized.

The method for manufacturing a rubber stopper according to claim 7 of the present invention is
In the secondary step of claims 2 to 6, the thick unvulcanized butyl rubber sheet has a fluorine rubber layer formed through a primer layer on the surface facing the upper mold for integral molding. To do.

A method for manufacturing a rubber stopper according to claim 8 of the present invention is
In the secondary process of claims 2 to 6, the thick unvulcanized butyl rubber sheet is characterized in that a fluorine rubber sheet is closely adhered to a surface facing an upper mold for integral molding.

A mold for producing a rubber plug according to claim 9 of the present invention is
In the mold that holds the legs when integrally molding the legs of the rubber stopper and the lid of the rubber stopper, the peripheral edge of the opening matches the upper inner edge of the mouth of the bottle and Has a curve that widens so that there is a gap between the legs, and has a depth that exposes the upper side surface of the leg onto the parting surface of the mold. It is characterized in that a concave portion for holding a portion having a depth of 2 mm or less is formed even if it is deep from the parting surface of the mold.

[0020]

According to the rubber plug of the first aspect of the present invention, since the upper end peripheral portion of the fluororesin film enters into the butyl rubber and is sandwiched by the butyl rubber of the lid portion and the butyl rubber of the leg portion, it is provided inside the bottle. The stored chemicals and the like are prevented from coming into contact with the butyl rubber of the legs, and the peripheral portion of the fluorine resin film is not peeled off. Since the butyl rubber is exposed on the surface of the lid portion that comes into contact with the upper end surface of the bottle mouth, the lid portion and the upper end surface of the bottle mouth are in close contact with each other, and the sealing performance is improved.

According to the method of manufacturing a rubber stopper of claim 2 of the present invention, when the legs and the lid are integrally molded in the secondary step, the pressure of the upper mold is uniform over the entire thick butyl rubber sheet. The legs are not crushed. Therefore, the vulcanized butyl rubber wraps around in the gap between the upper side surface of the leg and the peripheral edge of the opening of the recess, and the surface of the portion of the leg inserted into the bottle is covered with the fluorine resin film. The upper peripheral edge portion of the film enters the inside of the butyl rubber sheet so as to be sandwiched by the butyl rubber of the lid portion.

According to the method for manufacturing a rubber stopper of the third aspect of the present invention, the fluorine resin film can be adhered to the surface of the leg portion which is inserted into the bottle.

According to the method for producing a rubber plug of the fourth aspect of the present invention, even if the fluorine resin film is scratched, the coating film of the fluorine rubber further improves the hermeticity of insulating the butyl rubber from the chemical liquid.

According to the method for producing a rubber plug of claim 5 of the present invention, the fluorine resin film can be adhered to the surface of the leg portion of the vulcanized butyl rubber with the water-based paint, and the chemical liquid and the butyl rubber can be sufficiently avoided.

According to the method for producing a rubber stopper of claim 6 of the present invention, a double layer of a fluorinated resin film and a fluorinated rubber sheet is formed on the surface of a leg portion of vulcanized butyl rubber, and a chemical solution and the butyl rubber are formed. You can avoid it enough.

According to the method for producing a rubber stopper of claim 7 of the present invention, a fluorine rubber layer is formed on the upper surface of the lid, and the chemical solution or other liquid taken out from the bottle adheres to the surface of the lid. However, the reaction of the butyl rubber of the lid can be prevented.

According to the method of manufacturing a rubber stopper of claim 8 of the present invention, since the fluorine rubber sheet is brought into close contact with the thick unvulcanized butyl rubber sheet, the chemical liquid or other liquid taken out from the bottle It is possible to prevent the reaction of the butyl rubber of the lid even if it adheres to the surface of the lid.

According to the mold for producing a rubber plug of claim 9 of the present invention, when the leg portion of the rubber plug is integrally molded with the lid portion of the rubber plug in the secondary step, the upper portion of the fluorine resin film of the leg portion is formed. The vulcanized butyl rubber for the lid wraps around the peripheral surface and the fluorine resin film is embedded between the rubber on the leg and the rubber on the lid, so the end of the fluorine resin film peels off from the peripheral surface of the leg. Is prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rubber plug according to an embodiment of the present invention will be described below with reference to the drawings.

The rubber stopper of this embodiment is used as a cold-resistant rubber stopper for bottles that store freeze-dried chemicals, but the rubber stopper may be used for other chemicals, beverages and the like. . Also, what is stored in the bottle is not limited to liquid,
Granules, powders, solids such as pellets, or gas may be used.

FIG. 1 shows a sectional structure of a rubber plug according to an embodiment of the present invention. Reference numeral 1 is a lid portion made of butyl rubber, reference numeral 2 is a leg portion made of butyl rubber, and reference numeral 3 is a fluorine resin film ( For example, the product name is NEOFLON ETFE film EF-0050 manufactured by Daikin Industries, Ltd. with one-sided adhesive).

The lid portion 1 extends horizontally so as to come into close contact with the upper end surface of the mouth portion of a bottle (not shown), and the thickness of the lid portion 1 is about 4 mm. Below the lid portion 1, a leg portion 2 to be inserted into the mouth portion of the bottle is integrally formed. The surface portion of the leg portion 2 that is inserted into the bottle mouth is covered with the fluorine resin film 3. The leg portion 2 is formed in a cylindrical shape, and bulges outward so that the leg portion 2 stays in the bottle mouth when pressed into the bottle mouth and does not easily fall out. A flange 5 is formed on the upper side surface 2a of the leg portion 2 so as to project outward. The upper side surface 2a of the leg portion 2 is the flange portion 1a of the lid portion 1.
Coated with butyl rubber forming Leg 2
The upper side surface 2a of the base is covered with butyl rubber in the depth direction at a distance of about 2.5 mm from the upper end of the leg 2.
It is covered with butyl rubber from the bottom surface to a depth of approximately 1 mm. The portion of the leg portion 2 that covers the upper side surface 2a is smoothly curved in accordance with the chamfering curve of the inner edge of the mouth of the bottle to which the rubber plug is attached. The radius of this curve is about 1.5 mm, and a part of butyl rubber penetrates into the mouth of the bottle about 1.5 mm, but the part of the leg 2 inserted into the bottle is made of fluorine resin. Since the fluorine resin film 3 is covered with the film 3 and adheres tightly to the inner wall of the mouth of the bottle, there is no risk of contact between the chemical liquid and the butyl rubber.

The upper peripheral edge portion of the fluorine resin film 3 is sandwiched between the butyl rubber of the upper side surface 2a of the leg portion 2 and the butyl rubber of the flange portion 1a of the lid portion 1. Adhesion between the fluorine resin film 3 and the butyl rubber is performed by using an adhesive (for example, KE-42T manufactured by Shin-Etsu Silicon Co., KE-42TS manufactured by Shin-Etsu Silicon Co., SE9157 manufactured by Toray, SE170 manufactured by Toray).
0) may be used for adhesion. Fluoro resin film 3
Extends from the boundary portion 4 between the leg portion 2 and the lid portion 1 into the butyl rubber inside the lid portion 2.

A recess 6 having a trapezoidal cross section is formed on the upper surface of the leg 2. The recess 6 is formed by the lid 1 and the leg 2.
The butyl rubber of the lid portion 1 is filled at the time of integral molding with. The recess 6 has a thin bottom wall thickness of the recesses 7, 8 and 9 for inserting the injection needle and the air needle on the upper surface of the cover 1 by inserting the leg 2 into the cover 1. Is being prevented. As shown in FIG. 7, the leg portion 2 and the lid portion 1 are made by using the adhesive "Dieel", which is a fluorine rubber produced by Daikin Industries, Ltd.

The surface of the lid portion 1 is covered with a fluorine rubber layer 10 via a primer, and the chemical solution in the bottle is covered with the lid portion 1.
Even if it comes into contact with the surface of, the butyl rubber inside the lid 1 is contacted and the chemical solution or butyl rubber is not changed.

According to the rubber stopper of the present embodiment, the upper peripheral edge of the fluorine resin film 3 enters the butyl rubber and is sandwiched between the butyl rubber of the lid portion 1 and the butyl rubber of the leg portion 2 by the boundary portion. The chemical solution stored inside is prevented from coming into contact with the butyl rubber of the leg portion 2,
The peripheral portion of the fluorine resin film 3 does not peel off. Moreover,
Since the fluorine rubber shown in FIG. 7 is exposed on the surface 1a of the lid portion 1 which is in contact with the upper end surface of the bottle mouth, the lid portion 1 and the upper end surface of the bottle mouth are in close contact with each other to improve the sealing performance. Furthermore, by forming the concave portion 6, the thickness of the bottom portions of the concave portions 7, 8 and 9 is ensured, and it is possible to withstand multiple insertions of the injection needle. Further, even if the bottle chemical solution comes into contact with the surface of the lid portion 1, the butyl rubber inside the lid portion 1 does not come into contact with the chemical liquid or the butyl rubber.

Next, a mold for producing a rubber plug according to an embodiment of the present invention will be described.

FIG. 3 shows a main part of a mold for manufacturing the above rubber stopper.

The mold shown in FIG. 3 is a mold used in the primary process for forming the leg portion 2. Reference numeral 11 is a lower mold for the primary process, and reference numeral 12 is an upper mold for the primary process. is there.
The cavity 13 of the lower mold 11 is formed as a rubber stopper deeper by about 1.5 mm to 2.5 mm than the portion protruding from the lower surface of the lid 1. The upper die 12 has a convex portion 16 that forms a concave portion 6 at a position facing the cavity 13 of the lower die 11.
Is projected. A fluorine resin film 15 and an unvulcanized butyl rubber sheet 14 are arranged between the lower mold 11 and the upper mold 12.

As the fluorine resin film 15, polytetrafluoroethylene, polychlorotrifluethylene,
There are sheet films such as a fluorinated ethylene polypropylene copolymer, a tetrafluoroethylene-hexafluoroethylene copolymer, polyvinylidene fluoride and polyvinyl fluoride.

The butyl rubber sheet 14 is IIR, and when the fluorine resin film 15 is placed on the butyl rubber sheet 14 in a vacuum device and then returned to atmospheric pressure, the fluorine resin film 15 easily adheres to the butyl rubber sheet 14. However, the fluorine resin film 15 and the butyl rubber sheet 14 may be adhered by a primer. In order to improve the adhesion between the fluororesin film 15 and the butyl rubber sheet 14, the adhesive surface of the fluororesin film 15 with butyl rubber is roughened by sandblasting, discharge etching or the like. May be adhered to each other, and butyl rubber may be introduced into the irregularities of the rough surface during vulcanization to enhance the adhesiveness.

Reference numeral 17 shown in FIG. 4 is a punch for punching, and reference numeral 18 is a die used in the step of punching and separating the legs 2. A ring groove 18a that functions as a blade that separates the leg portion 2 is formed in the die 18 together with the cutting edge of the punch 17, and the leg portion 2 of the vulcanized rubber sheet 19 for forming the leg portion is located in the ring groove 18a. Then, when it stands still, the punch 17 descends and the leg 2 is separated from the vulcanized rubber sheet 19.

6 and 7 show a lower die and an upper die for the secondary process.

6 and 7, reference numeral 20 is a lower mold and reference numeral 21 is an upper mold. Lower mold 20 is vulcanized rubber sheet 1
It is provided with a concave portion 22 for mounting the leg portion 2 punched in the punching separation step of 9. This recess 22 is the lower mold 1 of the primary process.
1 is substantially similar to the cavity 13 and the cavity 1
It is formed to be slightly smaller than 3. The recess 22 is formed shallower than the cavity 13. As shown in FIGS. 5 and 6, when the punched leg 2 is mounted in the recess 22,
The upper end of the leg 2 is held so as to float up from the upper surface of the lower mold 20 by about 1 mm to 1.5 mm. Leg 22 is recess 2
When it is mounted on the second portion 2, the side surface upper portion 2a of the leg portion 2 and the opening peripheral edge portion 22a of the recess portion 22 do not contact with each other, and the portion of the leg portion 2 below the side surface upper portion 2a closely contacts the inner wall surface of the recess portion 22. still,
To mount the legs 2 in the recesses 22 of the lower mold 20, the legs 2 separated in the punching separation process are aligned with the positions of the recesses 22 of the lower mold 20 by an aligning machine, and the lower molds are inserted from above. Type 2
It is press-fitted into the recess 22 of 0. Opening peripheral edge portion 22 of the concave portion 22
A is curved according to the curve of the inner edge of the mouth of the bottle into which the leg 2 of the rubber stopper is inserted, and is chamfered so that the leg 2 is not damaged.

A cavity 23 forming the lid 1 is formed in the upper mold 21. The cavity 1 has a lid 1
Projections are formed to form concave portions 7, 8, 9 for the injection needle formed on the upper surface of the.

Lower mold 20 and upper mold 21 in the secondary process
Between the lower mold 20 and the lower mold 20, the leg 2 is first mounted, and then, as shown in FIG. 5, a thin unvulcanized butyl rubber sheet 24 and a thick unvulcanized butyl rubber sheet 25 are provided. Are sequentially arranged. First, a thin unvulcanized butyl rubber sheet 24 is laid on the upper surface of the lower mold 20, and a thick butyl rubber sheet 25 is laid on the butyl rubber sheet 24. As shown in FIG. 8, the thin butyl rubber sheet 24 is formed with a round hole 26 for positioning the leg portion 2 inside. The round hole 26 is larger than the flange portion 5 of the leg portion 2 and smaller than the outer diameter of the flange portion 1a of the lid portion 1,
The diameter of the round hole 26 is close to the diameter of the flange portion 5 of the leg portion 2.

In the present embodiment, the thick unvulcanized butyl rubber sheet 25 is bonded to the thin unvulcanized butyl rubber sheet 24 as shown in FIG. 7 in order to bond the lid 1 and the leg 2 to each other. A fluorine rubber coating film 27 is formed on the surface. Examples of the fluorine rubber include a copolymer of propylene hexafluoride and vinylidene fluoride, a copolymer of ethylene trifluoride chloride and vinylidene fluoride, a polymer of fluorinated acrylate, a fluorinated polyester, and the like. It is desirable to use a copolymer of propylene oxide and vinylidene fluoride (for example, Fluoro rubber trade name “DAIEL” manufactured by Daikin Industries, Ltd.). In the fluorine-containing rubber coating layer 27 formed on the thick unvulcanized butyl rubber sheet 25, the cavity 23 of the lid 1 is located as shown by the one-dot chain line in FIG. 7, and the leg portion is aligned with the position of the lid 1. 2 is located. Although not shown in FIG. 1, the lid portion 1 and the leg portion 2 are adhered to each other by a coating layer of fluorine rubber. The fluorine rubber coating layer 27 includes
In order to facilitate peeling from the lower mold 20 in the secondary step, the butyl rubber surface is exposed in a rectangular shape in the periphery, and
A hole 28 is provided inside the coating layer 27, and butyl rubber is exposed from the hole 28.

Next, a method of manufacturing the rubber plug according to the embodiment of the present invention will be described.

FIG. 9 is a diagram showing processing steps in the case of manufacturing the rubber plug shown in the above embodiment.

In the method of manufacturing the rubber stopper shown in this figure, the unvulcanized butyl rubber sheet 1 is used as the primary step for forming the leg portion 2 of the rubber stopper having the fluorine resin film 3 attached to the surface thereof.
Spray the primer to No.4 and the temperature is between 50 and 70 degrees for 10 minutes.
After heating and drying for 20 minutes, a Diesel Fluoro rubber layer is formed on the primer. Next, on the fluorine rubber layer of the butyl rubber sheet 14, the fluorine resin film 1
When 5 is placed and stored in the vacuum device and vacuumed,
The fluorine resin film 15 is vacuum-adsorbed on the fluorine rubber layer of DAI-EL. As shown in FIG. 2, after the vacuum adsorption of the fluorine resin film 15, the fluorine resin film 15 is placed on the lower mold 11 in the primary process, and then the lower mold 11 and the upper mold 12 are separated as shown in FIG. Is heated and pressed to vulcanize the unvulcanized butyl rubber sheet 14 to prepare a rubber sheet having a large number of legs 2. Once the rubber sheet is made, as shown in Figure 4,
The punch 2 and the die 18 punch and separate the leg 2 to complete the primary process.

In the preliminary step before the second step, the punched leg 2 is mounted in the recess 22 of the lower mold 20. Recess 2
The temperature of the lower mold 20 is 10
The temperature is about 0 ° C to 120 ° C. The recess 22 of the lower mold 20 is made shallow, and the opening peripheral edge 22a of the recess 22 is formed.
Since it is curved to match the inner edge of the bottle mouth, the side surface upper portion 2a of the leg portion 2 is exposed, and a gap is formed between the side surface upper portion 2a of the leg portion 2 and the opening peripheral edge portion of the recess. For this reason,
Butyl rubber that has been vulcanized in the next secondary step enters the gap and surrounds the upper side surface 2a of the leg portion 2.

In the secondary step, the thin unvulcanized butyl rubber sheet 24 is mounted on the upper surface of the lower mold 20 for the secondary step, and the lid 1 is formed on the thin unvulcanized butyl rubber sheet 24. Place the thick unvulcanized butyl rubber sheet 25
The upper die 21 for integral molding is integrally molded.

In this integral molding, the temperature of the lower mold 20 is approximately 100 to 120 ° C, and the temperature of the upper mold 21 is 160 ° C which is a temperature suitable for vulcanizing unvulcanized rubber.
~ 180 degrees C. When the unvulcanized butyl rubber sheet 24 is placed on the lower mold 20, the upper end of the leg 2 is located in the opening 26, the height of the upper end of the leg 2 and the upper surface of the thin unvulcanized butyl rubber sheet 24. The height is almost the same. On the upper surface of the thin unvulcanized butyl rubber sheet 24, a thicker unvulcanized butyl rubber sheet 25 is placed. For this reason,
It is avoided that the pressing force of the upper mold 21 acts locally on the leg portion 2, and the vulcanized butyl rubber is attached to the upper side surface 2 of the leg portion 2.
Fully wrap around a. Moreover, since the fluorinated butyl rubber of the leg 2 and the unvulcanized butyl rubber of the lid 1 are formed on the surface of the unvulcanized butyl rubber sheet 25 on which the leg 2 abuts, the above-mentioned fluorine rubber coating layer 27 called Daier is formed. And are bonded together, and further, the fluorine resin film 3 on the upper side surface 2a of the leg portion 2 is bonded to the butyl rubber of the lid portion 1 via a die.

After the integral molding, the lower mold 20 and the upper mold 21 are opened to remove the sheet having a large number of rubber stoppers, and the rubber stoppers are separated by a punching device (not shown). A stopper is obtained.

From the step of spraying and drying the unvulcanized butyl rubber sheet 14 on the unvulcanized butyl rubber sheet 14 of the above-described method for manufacturing a rubber plug to the step of placing the unvulcanized butyl rubber sheet 14 on the lower mold 11 and vulcanizing it. Lower mold 1 in the process up to
First, the fluorine resin film 15 is laid on 1, and then the unvulcanized fluorine rubber sheet is placed on the fluorine resin film 15.
There is also a manufacturing method in which the unvulcanized butyl rubber sheet 14 is placed on the unvulcanized fluoro rubber sheet and vulcanization in the primary step is performed.

Further, from the step of spraying and drying the primer on the unvulcanized butyl rubber sheet 14 of the above method for manufacturing a rubber plug to the step of vulcanizing by mounting the unvulcanized butyl rubber sheet 14 on the lower mold 11. In the process up to the end, after spraying and drying the primer on the unvulcanized butyl rubber sheet 14, a water-based paint (GL-252 manufactured by Daikin Industries, Ltd.)
Blow and bake at 50 ° C to 70 ° C for 10 to 20 minutes, and lower die 1
There is also a manufacturing method in which a fluororesin film 15 (Neotron ETFE manufactured by Daikin Industries, Ltd.) is laid on the substrate 1 and then an unvulcanized butyl rubber sheet 14 is placed on the fluororesin film 15 for vulcanization in the primary step.

Further, instead of the thick unvulcanized butyl rubber sheet 25 in the lower mold 20 of the secondary step of the method for manufacturing a rubber plug described in detail in the above embodiment, the upper mold 21 side of the butyl rubber 25 is provided. A method of mounting a fluorine rubber sheet on the surface or a method of forming a coating layer of the fluorine rubber through a primer is considered.

[0058]

According to the rubber plug of the first aspect of the present invention, since the upper end peripheral portion of the fluorine resin film enters the butyl rubber and is sandwiched between the butyl rubber of the lid portion and the butyl rubber of the leg portion, The chemical solution stored inside is prevented from coming into contact with the butyl rubber of the legs, and the peripheral portion of the fluororesin film is not peeled off. Butyl rubber is exposed on the surface of the lid that comes into contact with the upper end surface of the bottle mouth.
The lid and the upper end surface of the bottle mouth are in close contact with each other to improve the sealing performance.

According to the method for producing a rubber plug of claim 2 of the present invention, when the legs and the lid are integrally molded in the secondary step, the pressure of the upper mold is uniform over the entire thick butyl rubber sheet. The legs are not crushed. Therefore, the vulcanized butyl rubber wraps around in the gap between the upper side surface of the leg and the peripheral edge of the opening of the recess, and the surface of the portion of the leg inserted into the bottle is covered with the fluorine resin film. The upper peripheral edge portion of the film enters the inside of the butyl rubber sheet so as to be sandwiched by the butyl rubber of the lid portion.

According to the method for manufacturing a rubber stopper of the third aspect of the present invention, the fluorine resin film can be brought into close contact with the surface of the leg portion to be inserted into the bottle.

According to the method for producing a rubber plug of claim 4 of the present invention, even if the fluorine resin film is scratched, the coating film of the fluorine rubber further improves the sealing property of insulating the butyl rubber from the chemical liquid.

According to the method for producing a rubber plug of claim 5 of the present invention, the fluorine resin film can be adhered to the surface of the leg portion of the vulcanized butyl rubber by the water-based paint, and the chemical liquid and the butyl rubber can be sufficiently avoided.

According to the method for producing a rubber stopper of claim 6 of the present invention, a double layer of a fluorine resin film and a fluorine rubber sheet is formed on the surface of a leg portion of vulcanized vulcanized rubber, and a chemical solution and butyl rubber are formed. You can avoid it enough.

According to the method of manufacturing a rubber stopper of claim 7 of the present invention, a fluorine rubber layer is formed on the upper surface of the lid, and the chemical solution or other liquid taken out from the bottle adheres to the surface of the lid. However, the reaction of the butyl rubber of the lid can be prevented.

According to the method for producing a rubber plug of claim 8 of the present invention, since the fluorine rubber sheet is brought into close contact with the thick unvulcanized butyl rubber sheet, the chemical solution or other liquid taken out from the bottle It is possible to prevent the reaction of the butyl rubber of the lid even if it adheres to the surface of the lid.

According to the mold for producing a rubber plug of claim 9 of the present invention, when the leg portion of the rubber plug is integrally molded with the lid portion of the rubber plug in the secondary step, the upper portion of the fluorine resin film of the leg portion is formed. The vulcanized butyl rubber for the lid wraps around the peripheral surface and the fluorine resin film is embedded between the rubber on the leg and the rubber on the lid, so the end of the fluorine resin film peels off from the peripheral surface of the leg. Is prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a rubber plug according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where a fluorine resin film and an unvulcanized butyl rubber sheet are placed on a lower mold for a primary process in the manufacturing method according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a state where vulcanization is performed by a mold for a primary process in the manufacturing method according to the embodiment of the present invention

FIG. 4 is a sectional view of a step of punching and separating a leg portion in a primary step of a manufacturing method according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state where legs are attached to a lower mold for a secondary process in a preliminary process of the manufacturing method according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a state of integral molding in a secondary step of the manufacturing method according to the embodiment of the present invention.

FIG. 7 is a plan view of an adhesive surface of a thick unvulcanized butyl rubber sheet in the secondary process of the example of the present invention.

FIG. 8 is a plan view of a thin unvulcanized butyl rubber sheet in the secondary process of the example of the present invention.

FIG. 9 is a process step diagram of a manufacturing method according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lid portion 2 Leg portion 3 Fluoro resin film 4 Border portion between lid portion and leg portion 5 Flange portion 6 Recessed portion 10 Fluoro rubber layer 11 Lower die for primary process 12 Upper die for primary process 13 Cavity for leg portion 14 Unvulcanized butyl rubber sheet 15 Fluorocarbon resin film 16 Convex part 17 Punch 18 Mold 19 Vulcanized rubber sheet 20 Lower mold for secondary process 21 Upper mold for secondary process 22 Recessed part 22a Opening peripheral edge part 23 Lid part cavity

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Hiraizumi Inventor Yuichi Hiraizumi 4-2-22 Higashiyotsugi, Katsushika-ku, Tokyo Kazusa Hard Chrome Co., Ltd.

Claims (9)

[Claims] 1. A butyl rubber is integrally formed with a lid portion that extends horizontally so as to be in close contact with the upper end surface of the mouth portion of the bottle and a leg portion that projects downward from the lid portion and is inserted into the mouth portion of the bottle. In the rubber stopper, the surface portion of the leg portion inserted into the mouth of the bottle is covered with a fluorine resin film, and the upper end peripheral portion of the fluorine resin film is a boundary between the leg portion and the lid portion. A rubber plug, characterized in that the rubber plug extends from the portion into the butyl rubber inside the lid portion. 2. A primary step for forming a leg portion of a rubber stopper having a fluorine resin film adhered to a surface portion to be inserted into a bottle, and a secondary metal for a secondary step having a concave portion for holding the leg portion. The upper side surface of the leg portion is exposed above the upper surface of the lower mold in the concave portion of the mold, and the leg of the rubber stopper is provided with a gap between the upper side surface of the leg portion and the peripheral edge portion of the opening of the concave portion. A preliminary step of inserting a portion, and a thin unvulcanized having a wall thickness approximately equal to the height from the upper surface of the lower mold for the secondary step to the upper surface of the leg portion and having an opening larger than the leg portion. A butyl rubber sheet is prepared, and this thin unvulcanized butyl rubber sheet is placed on the upper surface of the lower mold for the secondary step so that the legs are located in the opening. Place the thick unvulcanized butyl rubber sheet that forms the lid on the A secondary step of performing integral molding an upper die for integral molding having a cavity for the lid part forming a plug of the manufacturing method of the rubber plug, characterized in that it comprises. 3. The method of manufacturing a rubber plug according to claim 2, wherein in the primary step, a fluorine resin film is placed on an upper surface of a lower mold for a primary step having a cylindrical cavity for molding the leg portion, and A step of vulcanizing the unvulcanized butyl rubber sheet by placing an unvulcanized butyl rubber sheet on the fluororesin film, closing the lower mold for the primary step and the upper mold for the primary step facing it, and , The lower mold and the upper mold for the primary step are opened to remove the vulcanized butyl rubber sheet having the fluorine resin film adhered to the surface thereof, and the vulcanized butyl rubber sheet removed from the vulcanized butyl rubber sheet has a cylindrical shape. And a step of taking out the leg portion of the rubber stopper by separating the peripheral edge portion. 4. The method for producing a rubber plug according to claim 2, wherein in the primary step, a coating film of fluorine rubber is formed on an unvulcanized butyl rubber sheet via a primer layer, and then, on the coating film of fluorine rubber. The step of bringing the fluororesin film into close contact with the upper surface of the lower mold for the primary step having a cavity for molding the tubular leg portion of the rubber stopper, and the unvulcanized butyl rubber with the fluorocarbon resin film facing downward. A step of placing a sheet, closing the upper mold and the lower mold for the primary step, and vulcanizing the vulcanized butyl rubber sheet to project a tubular portion serving as a leg portion of the rubber plug on the lower surface of the vulcanized rubber sheet, and Opening the first lower mold and the first upper mold and removing the vulcanized butyl rubber sheet from which the tubular part is separated along the peripheral edge thereof to take out the leg part of the rubber plug. A method for producing a rubber stopper, which is characterized. 5. The method for producing a rubber plug according to claim 2, wherein the primary step is to form an aqueous paint layer on an unvulcanized butyl rubber sheet via a primer layer, and to form a cylindrical leg portion of the rubber plug. A fluorine resin film is mounted on the upper surface of the lower mold for the primary step having a cavity for molding, and the unvulcanized butyl rubber sheet is mounted with the water-based paint layer facing downward on the fluorine resin film, and the primary step is performed. For closing the upper mold and the lower mold for vulcanization to project the vulcanized butyl rubber sheet on the side of the fluororesin film layer into a tubular shape, and the first lower mold and the first mold. And a step of separating a tubular portion from the vulcanized butyl rubber sheet which is opened and removed from the upper mold and taken out as a leg portion of the rubber stopper. 6. The method of manufacturing a rubber stopper according to claim 2, wherein the primary step has a fluorine resin film on a top surface of a lower mold for a primary step having a cavity for molding a cylindrical leg portion of the rubber stopper. Fluorocarbon resin sheet layer side of vulcanized butyl rubber sheet by loading fluorine rubber sheet and unvulcanized butyl rubber sheet sequentially from bottom to top, and vulcanizing by closing the upper mold and lower mold for the primary process. A cylindrical portion along the peripheral edge of the butyl rubber sheet obtained by opening and removing the first lower mold and the first upper mold. And a step of taking out the rubber stopper. 7. The method for manufacturing a rubber stopper according to claim 2, wherein the thick unvulcanized butyl rubber sheet for forming the lid portion of the rubber stopper in the secondary step is for integral molding. A method for producing a rubber stopper, characterized in that a fluorine rubber layer is formed on a surface of the upper surface facing the upper mold via a primer layer. 8. The method of manufacturing a rubber plug according to claim 2, wherein a thick unvulcanized butyl rubber sheet for forming a lid of the rubber plug in the secondary step is for integral molding. A method for manufacturing a rubber stopper, characterized in that a fluorine rubber sheet is closely adhered to a surface of the rubber mold facing the upper mold. 9. A rubber plug manufacturing mold for manufacturing the rubber plug according to claim 1, wherein the leg part of the pair of molds integrally forming the leg part of the rubber plug and the lid part of the rubber plug. The mold holding the has a curved opening whose peripheral edge coincides with the inner edge of the upper end of the mouth of the bottle and widens so that there is a gap between the upper side of the leg and
And, it has a depth that exposes the upper side surface of the leg to the parting surface of the mold, and further, at the deepest part from the parting surface of the mold of the leg surface, the depth is 2 mm or less. A mold for producing a rubber plug, characterized in that a concave portion for holding the above-mentioned part is formed.