JP2003112114A - Forming method for covering film on cork stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a thin coating film made of a synthetic resin on an outer surface of a stopper body at a low cost. SOLUTION: Only one layer of a synthetic resin powder 31 is stuck on an underside 23 and an outer periphery surface 24 of the stopper body 2 comprising a cork resin or formed by hardening cork resin grains with an adhesive. Then, the powder 31 is heated and melted by irradiating the powder 31 with far infrared rays emitted by a far infrared generating device 5. Thereafter, the coating film (not shown) made of the synthetic resin is formed on the underside 23 and the outer periphery surface 24 of the stopper body 2 by solidifying the melted resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a coating film on a cork stopper for forming a synthetic resin coating film on the outer surface of a stopper body containing a cork material.

[0002]

2. Description of the Related Art In recent years, cork stoppers in which a synthetic resin coating is formed on the lower surface and the outer peripheral surface of a stopper body containing cork material are often used. This is to prevent a part of the cork material from falling off and mixing with the beverage contained in the bottle by forming a film on the stopper main body, or the deterioration of the stopper main body due to the alcohol content contained in the beverage. Because you can.

By the way, as a method of forming a synthetic resin film on the lower surface and the outer peripheral surface of the plug body, there are, for example, those described in JP-A-5-31831 and JP-A-5-85555. In these forming methods, first, a synthetic resin container having a bottomed cylindrical shape with an open upper end is molded by blow molding. Next, the stopper body is inserted into this container. After that, the container in which the stopper body is inserted is inserted into the molding recess of the mold, and the container is heated and melted. As a result, a synthetic resin coating is formed on the lower surface and outer peripheral surface of the plug body.

[0004]

In the above conventional method for forming a coating film, a step of blow molding a container, a step of inserting a stopper main body into the container, a step of inserting the container and the stopper main body into a molding recess of a mold, At least four steps of heating and melting the container are required, and the manufacturing steps are diverse. Therefore, there has been a problem that the labor and cost required for forming the coating increase. Further, since the container is formed by the blow molding method, it is difficult to reduce the thickness of the container to a certain level or more, and accordingly the thickness of the coating film becomes relatively large. Specifically, it was difficult to set the thickness of the coating to 0.2 mm or less.

[0005]

The present invention has been made to solve the above problems, and is a method of forming a coating film on a cork stopper in which a synthetic resin coating film is formed on the outer surface of a stopper main body containing a cork material. In the above, the synthetic resin powder is attached to the outer surface of the stopper body, and the powder is heated and melted to form a synthetic resin film on the outer surface of the stopper body. When the powder is attached to the plug body, it is desirable to adopt an electrostatic coating method. The above powder is
It is desirable to heat and melt it by irradiating it with far infrared rays.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 shows an example of a cork stopper having a coating formed by the forming method according to the present invention. A cork stopper 1 has a stopper body 2 containing a cork material and a coating 3 made of synthetic resin. ing.

The stopper main body 2 is in the form of a rod having a vertically long circular cross section.
2 is formed. The mounting hole 22 is for inserting and fixing the lower end portion of the grip portion (not shown). Therefore, when the grip portion is not attached to the stopper body 2, the attachment hole 22 is unnecessary. Further, a chamfer 25 having a quadrangular cross section and having an arc shape is formed between the lower end surface 23 and the outer peripheral surface 24 of the plug body 2. This chamfer 5 does not necessarily have to be formed.

The plug body 2 can be manufactured by shaving the cork bark. In this case, the entire plug body 2 is made of cork material.
Further, the plug body 2 can be formed by mixing cork particles obtained by crushing cork bark with an adhesive and then pressing and heating the mixture in a mold. Alternatively,
When pressurizing and heating the cork particles and the adhesive, a compressed body having an appropriate thickness is first formed as described in the above two publications without directly molding the stopper body 2 thereby. Then, the plug body 2 may be formed by stacking the compressed bodies as needed and fixing the compressed bodies to each other.

The coating 3 is made of synthetic resin such as polyethylene, polypropylene and polyester.
It has a thickness of about 50 to 200 μm. In addition, in this cork stopper 1, the coating 3 is the lower surface (outer surface) 23 of the stopper body 2.
Although it is formed on the outer peripheral surface (outer surface) 24, only the lower surface 23 of the stopper main body 2 comes into contact with the liquid in the bottle when the opening of the bottle is closed by the cork stopper 1. Therefore, the coating film 3 may be formed only on the lower surface 23. vice versa,
A coating may be formed not only on the lower surface 23 and the outer peripheral surface 24 but also on the upper surface 21 and the inner surfaces of the mounting holes 22.

The coating 3 is applied to the lower surface 23 and the outer peripheral surface 2 of the plug body 2.
In the case of forming No. 4, as shown in FIG. 1, the synthetic resin powder 31 forming the coating 3 is attached to the lower surface 23 and the outer peripheral surface 24 of the plug body 2. At this time, the powder 31 is formed on the inner surfaces of the upper surface 21 and the mounting hole 22 where it is not necessary to form the coating 3.
Masking is applied to prevent the adherence. It is desirable to use the powder 31 having a particle size of about 10 to 50 μm. The powder 31 can be attached to the lower surface 23 and the outer peripheral surface 24 by a known spray gun. When the powder 31 is attached, it is desirable to do the following in order to prevent the powder 31 from scattering and deteriorating the working environment.

That is, an adhesion chamber (not shown) is provided which is shielded from the outside except the inlet and the outlet. A transfer means (not shown) for loading the plug body 2 into the deposition chamber from the inlet and unloading it from the outlet is provided in the deposition chamber. The injection guns are installed on both sides and the lower side of the carrying means in the carrying direction. On the other hand, as shown in FIG.
The support shaft 4 is inserted and fixed to the plug body 2, and the plug body 2 is attached to the conveying means via the support shaft 4. Then, the stopper body 2 is conveyed by the conveying means into the adhesion chamber. The powder 31 sprayed by the spray gun adheres to the lower surface 23 and the outer peripheral surface of the plug body 2 while the plug body 2 is conveyed from the inlet to the outlet of the deposition chamber. Moreover, since the powder 31 sprayed from the spray gun is in an atmosphere in which a large amount of powder 31 is suspended in the deposition chamber, the suspended powder 31 is also deposited on the plug body 2. This allows
The powder 31 can be uniformly attached to the lower surface 23 and the outer peripheral surface 24 without any gap. In particular, when the plug body 2 is slowly rotated around the axis of the mounting hole 22 (the axis of the plug body 2), the powder 31 can be attached more uniformly.

As is apparent from FIG. 1, the powder 31 only adheres to the lower surface 23 and the outer peripheral surface 24, and does not form a plurality of layers. This is the lower surface 23
This is because the powder 31 that has come into contact with the powder 31 that has adhered to the outer peripheral surface 24 does not adhere to the powder 31 on the plug body 2 side and falls off. When the powder 31 is attached to the lower surface 23 and the outer peripheral surface 24, it is desirable to charge the powder 31 with static electricity in order to increase the adhesive force of the powder 31 to the plug body 2. That is, it is desirable to adhere the powder 31 to the plug body 2 by the electrostatic coating method.
As a method of charging the powder 31 with static electricity, there is a triboelectric charging method.

Next, the lower surface 23 and the outer peripheral surface 24 of the plug body 2
The powder 31 attached to is melted by heating. In this case, it is desirable that the heating temperature be as low as possible within the range where the powder 31 can be melted. This is to prevent the cork material forming the plug body 2 from being burnt by the heat for melting the powder 31. To prevent charring of cork wood, powder 3
It is desirable to heat 1 by far infrared. For example,
As shown in FIG. 1, the far-infrared ray generators 5 are installed to face the lower surface 23 and the outer peripheral surface 24 of the stopper body 2, respectively, and the far-infrared ray generators 5 irradiate the powder 31 with far-infrared rays. It is desirable to irradiate far infrared rays using the following heating chamber.

That is, the heating chamber is installed in front of the deposition chamber in the transport direction of the transport means. Into the heating chamber, the plug body 2 to which the powder 31 is attached is carried in from the entrance and carried out by the carrying means. The far-infrared ray generators 5 are installed on both sides and the lower side of the conveying means in the conveying direction. Then, while the plug body 2 is transported from the inlet to the outlet in the heating chamber, the far infrared rays generated by the far infrared ray generating device 5 heats and melts the powder 31.
Moreover, the entire heating chamber has a high temperature atmosphere in which the powder 31 is melted by the far infrared rays emitted by the far infrared ray generating device 5. Therefore, the powder 31 attached to the lower surface 23 and the outer peripheral surface 24 of the plug body 2 can be uniformly melted. In this case, the plug 2 can be more uniformly melted by slowly rotating it about its axis. After that, when the plug body 2 is carried out from the outlet of the heating chamber, the molten resin is naturally cooled by the outside air and solidified. As a result, the lower surface 2 of the stopper body 2
A thin coating 3 made of synthetic resin is formed on the outer peripheral surface 24 and the outer peripheral surface 24. Moreover, the coating film 3 is fixed to the lower surface 23 and the outer peripheral surface.

In the above-mentioned forming method, the coating 3 of synthetic resin is formed on the plug body 2 by only two steps of attaching the powder 31 to the plug body 2 and heating and melting the powder 31. You can Therefore, at least 4
The labor and cost required for forming the cork stopper 1 can be significantly reduced as compared with the conventional forming method that requires two steps. Further, since the powder 31 attached to the plug body 2 is melted and solidified to form the coating film 3, the thickness of the coating film 3 can be reduced as compared with blow molding. When the coating 3 is thin, when the cork stopper 1 is press-fitted into the mouth of the bottle, the elasticity of the stopper main body 2 including the cork material allows the coating 3 formed on the outer peripheral surface 25 of the stopper main body 2 to be almost evenly covered. It can be pressed into contact with the inner peripheral surface, whereby the mouth of the bottle can be reliably sealed.

FIG. 3 shows another example of a cork stopper having a coating film formed by the forming method of the present invention. In this cork stopper 1 ′, the coating 3 is not formed on the entire outer peripheral surface 24 of the stopper main body 2, but the coating 3 is annularly formed only on the intermediate portion of the outer peripheral surface 24 in the longitudinal direction of the stopper main body 2. . Further, at the intersection of the lower surface 23 and the outer peripheral surface 24,
The chamfer 25 is not formed and intersects at a substantially right angle. Other configurations are the same as those of the cork stopper 1 described above,
The coating 3 can be formed in the same manner as in the case of the cork stopper 1.

The present invention is not limited to the above embodiment, but can be modified as appropriate. For example, in the above embodiment, the powder 3 attached to the stopper body 2
Although 1 is heated and melted and then solidified to complete the formation of the coating film 3, after the coating film 3 is solidified, the entire plug main body 2 is inserted into the molding concave portion of the mold to form the coating film 3 in the concave portion. Touch the inner surface. Then, the coating film 3 may be melted again by a mold and then solidified.

[0018]

As described above, according to the method for forming a coating film on a cork stopper of the present invention, the labor and cost required for forming the coating film can be greatly reduced, and the thickness of the coating film can be reduced. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing a heating and melting step of powder in a method for forming a coating film according to the present invention.

FIG. 2 is a cross-sectional view showing an example of a cork stopper having a film formed by the method for forming a film according to the present invention.

FIG. 3 is a cross-sectional view showing another example of a cork stopper having a film formed by the method for forming a film according to the present invention.

[Explanation of symbols]

1 cork stopper 1'cork stopper 2 stopper body 3 film 22 Lower surface (outer surface of stopper body) 24 Outer peripheral surface (outer surface of plug body) 31 powder

Continued front page    F-term (reference) 3E084 AB01 BA01 EA02 EC03 EC04                       EC05 EC07 EC09                 4D075 AA09 BB29Z BB37Z CA47                       DA23 DB21 DC38 DC41 EA02                       EB13 EB35

Claims (3)

[Claims] 1. A method of forming a synthetic resin film on the outer surface of a stopper body containing cork material, wherein a synthetic resin powder is adhered to the outer surface of the stopper body, and the powder is heated and melted to form the stopper. A method of forming a coating film on a cork stopper, characterized in that a coating film made of synthetic resin is formed on the outer surface of the main body. 2. The method for forming a coating film on a cork stopper according to claim 1, wherein the powder is applied to the stopper body by an electrostatic coating method. 3. The method for forming a coating film on a cork stopper according to claim 1, wherein the powder is heated and melted by irradiating far infrared rays.