JPH05317527A - Balloon and its production - Google Patents

Abstract

PURPOSE:To provide the balloon, on the surface of which large projecting objects do not exist, and which is highly safe and can easily be produced, and the process for production of such balloon. CONSTITUTION:Latex 13 is poured into a mold 11 having a cylindrical aperture 12 in a part. The latex 13 is spread by rotation, etc., over the entire part of the inside surface of the mold 11 and is vulcanized in the state of closing the aperture 12 by fitting a plug 14 therein to deposit and form a latex film 15 formed with a thick part 16 in the section corresponding to the closed section on the inside surface of the mold 11. The latex film 15 is parted from the mold and is dried. The thick part 16 integrally molded in the latex film 15 of the balloon obtd. in such a manner acts as a check valve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balloon and a method for manufacturing the same, and more particularly to a balloon used as a general play equipment such as balls and balloons, a wrapping material, a slimming tool, and a method for manufacturing the same.

[0002]

2. Description of the Related Art For example, general play equipment such as balls and balloons,
A latex balloon used as a wrapping material, a medical device, or a slimming device [those left in the stomach for about 3 months for slimming] is usually vulcanized as shown in (a) and (b) of FIG. The outer surface of the molding die (3) is vulcanized after immersing the molding die (3) in a tank (2) containing a natural or synthetic latex (1) to which agents and the like have been added in a predetermined composition and then pulling it out. A latex film (4) is adhered to and formed, and then the latex film (4) is released and dried.

Alternatively, as shown in FIGS. 6 (a) and 6 (b), a vulcanizing agent or the like is added to the inside of a spherical molding die (3) having an opening (5) in a predetermined composition. The above-mentioned latex (1) is spread over the entire inner surface of the molding die (3) by pouring the above-mentioned natural or synthetic latex (1), and then a latex film (4) is vulcanized on the inner surface of the molding die (3). It is also possible to manufacture by depositing and then releasing and drying the latex film (4).

The above-mentioned production includes a coagulating liquid method and a heat-sensitive method, which vary depending on the blending of the latex. In the coagulating liquid method, a treatment with a polyvalent metal salt is performed before the treatment with the latex, and in the heat-sensitive method, a mold is After heating to some extent, the treatment with latex is performed.

Balloon (6) obtained by the above-mentioned manufacturing method
After filling the inside of the latex film (4) with gas or liquid, tie the mouth (7) with a string (8) as shown in FIG. 7, or as shown in FIG. By fixing a separate check valve (9) to the mouth (7) with an adhesive or the like (not shown), it is possible to prevent the contents of the latex film (4) from flowing out to the outside. ing.

[0006]

By the way, since the balloon (6) is used inside the human body, especially when it is used as a medical or slimming tool, it must be made of a material safe for the human body. Also, the surface of the balloon (6) should not have large protrusions so as not to damage the stomach.

However, in the method for producing the balloon (6), the gas or liquid inside the latex film (4) is bound by the method of binding the mouth (7) of the latex film (4) with the string (8) as described above. It is difficult to completely prevent the oil from flowing out, and the mouth part (7) bound by the latex film (4) expanded by the filling of gas or liquid is largely projected, and the shape is also very good. Not something
As described above, the protrusion may damage the stomach, so that it cannot be used as a medical or slimming tool.

Also, the mouth portion (7) of the latex film (4)
In the method of mounting the separate check valve (9) on the above, it is necessary to manufacture the separate check valve (9), which complicates the manufacturing process and is poor in workability. Further, when the check valve (9) is fixed to the mouth portion (7) of the latex film (4), it is very difficult to bond the check valve (9), and the adhesive has a low molecular weight. Since the components are usually contained, when used in the human body as a medical or slimming tool, the contained components start to melt and adversely affect the human body, which is not preferable.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide a balloon having no protrusions on the surface thereof, which is highly safe and easy to manufacture, and a manufacturing method thereof. To provide.

[0010]

As a technical means for achieving the above object, the method of the present invention is such that a latex is contained in a mold and the latex is spread over the entire inner surface of the mold and applied. It is characterized in that a latex film, which is partially vulcanized and has a thick portion formed, is adhered to the inner surface of the mold.

Further, the balloon according to the present invention is characterized in that it is made of a latex film in which a thick portion is integrally molded.

[0012]

In the method of the present invention, when the latex contained in the mold is spread over the entire inner surface of the mold and vulcanized, part of the latex film deposited on the inner surface of the mold is It becomes a thick part. In this way, it becomes possible to manufacture a latex film in which a thick portion is integrally formed in a part by a simple means. In the balloon of the present invention obtained by the above production method, the thick portion formed in a part of the latex coating acts as a check valve.

Therefore, in the present invention, since the opening is not formed in a part of the latex film, means for binding the opening or attaching a check valve to the opening as a separate body is taken. Since it is not necessary, workability can be improved in manufacturing, and large protrusions are not formed on the surface of the latex film, so that safety in use can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a balloon and a method of manufacturing the same according to the present invention will be described with reference to FIGS. The method of the present invention described below can be applied to either the coagulation liquid method or the heat-sensitive method, and it varies depending on the blending of the latex, but the treatment with the metal salt alcohol is performed in the coagulation liquid method before the treatment with the latex. In the heat sensitive method, the mold is heated to some extent. Also, the latex is
Various vulcanizing agents prepared as dispersions, vulcanization accelerating aids,
It is a blend of natural or synthetic latex with additives such as a vulcanization accelerator.

First, the first embodiment of the method of the present invention is shown in FIG.
As shown in (a) and (b) of item (a) and (b), a molding die (11) that has been pretreated by the coagulating liquid method or the heat sensitive method is prepared. This molding die (11) is a spherical molding die (11) partially having a cylindrical opening (12), and a latex (13) is molded from the opening (12) of the molding die (11). Pour into the mold (11). Then, the plug (14) is fitted into the opening (12) and gently shaken or rotated with the plug closed to spread the latex (13) over the entire inner surface of the molding die (11) to form the molding die. Invert (11) and vulcanize it at about 80 ° C. Next, after about 10 minutes, the plug (14) is removed and vulcanization is continued. By this vulcanization, the mold (1
A latex film (15) is deposited on the inner surface of 1). At this time, the portion corresponding to the plugged portion (A) where the stopper (14) was fitted in the opening (12) of the molding die (11) is the thick portion (16).
Becomes In this way, the latex film (15), in which the thick portion (b) is formed, is released from the mold.

Next, a second embodiment of the method of the present invention will be described with reference to FIG.
As shown in (a) and (b) of FIG.
The spherical mold (11) having is subjected to pretreatment by a coagulating liquid method or a heat-sensitive method, and then the latex (13) is poured into the mold (11) as in the first embodiment. On the other hand, after preparing the substrate (18) on which the semi-vulcanized latex sheet (17) is formed, the molding die (11) is turned upside down and the opening (12) is placed on the latex sheet (17). Place on.
As described above, the molding die (11) is rotated by joining the opening (12) of the molding die (11) to the latex sheet (17).
The latex (13) is spread and vulcanized on the entire inner surface of the.
By this vulcanization, a latex film (15) is formed on the inner surface of the mold (11), and the latex film (15) is released and then dried. In this case, the portion where the opening (12) of the mold (11) corresponds to the joining portion (B) placed on the latex sheet (17) becomes the thick portion (16).

Finally, in the third embodiment of the method of the present invention, as shown in FIGS. 3 (a) and 3 (b), an upper mold (11a) and a lower mold (1a) are used.
1b) can be divided into two parts, one side (lower mold (11b) in the figure)
A spherical mold (11) having a recess (19) formed in a part thereof is prepared. A mold (11) that has been pretreated by a coagulating liquid method or a heat-sensitive method is divided into two parts, for example, a lower mold (11b)
The latex (13) is housed in the above and then the upper mold (11a) is mounted to integrate the molding mold (11). And a mold (11)
The latex (13) is spread over the entire inner surface of the molding die (11) by biaxial rotation of the rubber composition and vulcanized. By this vulcanization, a latex film (15) was formed on the inner surface of the mold (11), and the latex film (15) was released by separating the upper mold (11a) and the lower mold (11b). Dry on.
In the latex film (15), a portion corresponding to the concave portion (19) of the molding die (11) [lower die (11b) in the figure] is a thick portion (16).
Becomes

As described above, in the method of the present invention described in the first to third embodiments, when forming the latex film (15), the plugging portion (A) of the molding die (11) [first embodiment],
Sheet joining portion (B) [second embodiment], recess (19)
The thick portions (16) are formed by accumulating the latex (15) in the portions corresponding to [Third Embodiment]. Then, the balloon (20) of the present invention obtained by releasing from the molding die (11) and drying is (a) to (c) of FIG.
As shown in FIG. 3, the latex film (15) partially has a thick portion (16), and the thick portion (16) acts as a check valve. That is, when the latex film (15) is expanded, the needle or the like of the syringe (21) is inserted into the thick portion (16) and gas or liquid is injected into the inside to fill the latex film (15). At this time, the gas or liquid filled inside does not escape even after the thick part (16) serves as a check valve and the needle of the syringe (21) is pulled out, and the latex film (15) The expanded state can be reliably maintained. Also, the latex film (15) on the thick part (16)
The surface shape of can be made smooth by the plugging form at the opening (12) of the mold (11), the sheet joining form or the recess form, and when the opening of the latex film is tied with a string as in the past. It is possible to eliminate large protrusions as compared with.

The diameter of the mouth portion (22) of the balloon (20) is preferably 3 mm or more, preferably 7 mm or more and 30 mm or less at the maximum. If the diameter is smaller than 3 mm, it will be difficult to pour the latex (13) into the mold (11). On the contrary, if the diameter is larger than 30 mm, the thick part (16) in which the latex (13) is stored is uneven. There is a risk that the gas or liquid filled inside will leak. This thick part (16)
The thickness depends on the size and thickness of the balloon (20),
If it is 1 mm or more, preferably 2 mm or more, the function as a check valve is sufficiently exhibited. If the thickness is 10 mm or more, the effect of eliminating protrusions on the surface of the balloon cannot be obtained, which is not preferable. For example, diameter 30mm, mouth 10mm, thickness 0.5m
In the balloon (20) having a size of about m, it is sufficient that the thickness of the thick portion (16) is about 3 mm.

The results of the experiment conducted by the present inventor will be described below. The method of the present invention was carried out based on the coagulating liquid method.
A vulcanizing agent [sulfur] of 1.5, a vulcanization accelerating aid [zinc white] of 1, a vulcanization accelerating agent of 1 and soft water were blended in an appropriate ratio with respect to 100 parts by weight of natural rubber latex .. If the rubber content is 40% or less, the physical properties will be low. On the other hand, when it is 60% or more, it is difficult because the latex before compounding contains a certain amount of water. Consists of the above-mentioned compounding examples, and the compounding method is to add a vulcanizing agent and a vulcanization accelerating aid dispersed in natural rubber latex, and a vulcanization accelerating agent at 25 ° C to 35 ° C.
Let stand for about 12 to 24 hours in a constant temperature bath to accelerate aging and prevulcanization. The mold (11) was filled with 30% alcohol solution of calcium nitrate and latex was evenly adhered to the inner surface of the mold (11), and then the plug (14) was fitted into the opening (12) of the mold (11). ) Upside down and vulcanize at 80 ° C for about 10 minutes. Then, the stopper (14) of the opening (12) is pulled out, the molding die (11) is turned upside down, and then vulcanization is carried out to manufacture.

The above-mentioned latex composition is merely an example, and other compositions can be produced.

[0022]

According to the present invention, since it is possible to very easily manufacture a balloon integrally formed with a thick portion that acts as a check valve, it is possible to use a gas without attaching the check valve as a separate body. Alternatively, it is possible to prevent the outflow of the liquid, so that the work of manufacturing the check valve and the work of adhering the check valve are unnecessary, and the workability is greatly improved.

Further, when a balloon is used for a long period of time, the adhesive strength may be reduced when an adhesive is used. However, the balloon without the adhesive does not have such a concern, and the entire balloon can be used without the adhesive. Being latex, it is safe for the human body.

Further, unlike the case where the opening is tied with a cord or the check valve is attached as a separate body, there is no large protrusion on the balloon surface, which is safe for the human body.

[Brief description of drawings]

FIG. 1 is a view for explaining a first embodiment of the method of the present invention, (a) is a cross-sectional view showing a state in which latex is poured into a molding die, and (b) is a stopper and the molding die is turned upside down. Sectional view showing the state

2A and 2B are views for explaining a second embodiment of the method of the present invention, in which FIG. 2A is a sectional view showing a state where latex is contained in a molding die, and FIG. Sectional view showing a state of being placed on a vulcanized latex sheet

FIG. 3 is a view for explaining a third embodiment of the method of the present invention, (a) is a cross-sectional view showing a state where latex is contained in a molding die, and (b) is a molding die which is rotated biaxially. Sectional view showing the state after

FIG. 4 shows a balloon obtained by the method of the present invention,
(A) is a sectional view showing a balloon according to the first embodiment,
(B) is a sectional view showing a balloon according to the second embodiment,
FIG. 7C is a sectional view showing a balloon according to the third embodiment.

FIG. 5 is a view for explaining a conventional example of a method for producing a balloon, (a) is a cross-sectional view showing a state before the molding die is immersed in latex, and (b) is a sectional view after the molding die is immersed in latex. Cross-sectional view showing the state of

6A and 6B are views for explaining another conventional example of a method for manufacturing a balloon, in which FIG. 6A is a cross-sectional view showing a state in which latex is poured into a molding die, and FIG. Sectional view showing the state

FIG. 7 is a cross-sectional view showing a state in which the mouth of a balloon obtained by a conventional manufacturing method is tied with a string.

FIG. 8 is a cross-sectional view showing a state in which a check valve is separately attached to the mouth of a balloon obtained by a conventional manufacturing method.

[Explanation of symbols]

 11 Mold 12 Opening 13 Latex 14 Plug 15 Latex film 16 Thick part 17 Semi-vulcanized latex sheet 18 Recess 20 Balloon A Closing part B Sheet joining part

Claims (2)

[Claims] 1. A latex is housed inside a mold, and the latex is spread and vulcanized on the entire inner surface of the mold,
A method for producing a balloon, characterized in that a latex film having a thick portion formed on a part thereof is adhered to the inner surface of a molding die. 2. A balloon comprising a latex film in which a thick portion is integrally molded.