JP2002112892A - Electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of a pat mark in printing a printing layer by a pat transferring system in an electric water heater where a fluororesin film is formed on the inner surface of a container and the printing layer is formed on it. SOLUTION: At least 20 wt.% carbon is contained in the fluororesin film, thereby the aggregation of a bleed layer to be formed after baking of the fluororesin film is and the generation of the pat mark is eliminated as the result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for forming a printing layer by a pad transfer method on a film mainly composed of a fluororesin formed on the inner surface of a container (hereinafter referred to as "fluororesin film"). The present invention relates to an electric water heater that eliminates the trace of a pad generated when the pad comes into contact with the film.

[0002]

2. Description of the Related Art Many cooking utensils, such as electric water heaters and hot plates, use parts such as containers having a fluororesin film formed on the surface thereof. Heretofore, even when some kind of display is required, it has been common to display it by engraving the container.

[0003] In recent years, inks having a composition containing a component similar to the solid component constituting the fluororesin film (for example, a fluororesin or a binder component of the fluororesin film) so as to adhere to the fluororesin film have been developed. Has been
Using this ink, a method has been devised in which a printing layer is formed on a dried fluororesin film, and the printing layer is simultaneously fired and adhered when the fluororesin film is fired (Japanese Patent Application No. 5-2515).
No. 70), and some have been applied. As described above, the place where the printing layer needs to be formed on the container is often located inside the container, so there are restrictions on the method of forming the printing layer, and generally, the main component is a silicone rubber or the like. A so-called “pat transfer method” is often used, in which a printing ink is transferred from a plate on which a printing pattern is formed using a pad to a film by the pad to form a print layer.

[0004]

However, when a printing layer is formed in this manner, for example, when a pad containing silicone rubber as a main component is used, the pad of silicone rubber is inevitably formed on the fluororesin film after drying. And the silicone resin component, especially the low molecular weight component, adheres to the fluororesin film. Usually, in a fluororesin film, a coating film component, particularly a resin component, melts and flows during firing, and the fluororesin bleeds smoothly on the outermost surface layer after firing.
However, where there is a silicone resin component that is not very compatible with the fluororesin, the stable bleed layer of the fluororesin is broken and agglomerated, resulting in a roughened surface, resulting in a different appearance only in that portion, "Pat marks" appeared, and there was a problem that became a problem in appearance.

The present invention has been made to solve such a problem, and has been devised so that even if a printing layer is formed on a fluororesin film by a pad transfer method, no trace of a pad remains.

[0006]

In order to solve the above-mentioned problems, the present invention is to form a fluororesin film containing at least a fluororesin, a pigment and a binder component on the surface of a container, and to coat a carbon pigment as the pigment in the film. It contains 20 wt% or more, and a printed layer is formed on the film by transferring it with a pad. With such a configuration, the fluidity of the coating film components during the firing of the fluorine coating is suppressed, and as a result, the trace of the pad can be eliminated.

[0007]

DETAILED DESCRIPTION OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to form a fluororesin film containing at least a fluororesin, a pigment and a binder component on the surface of a container, and to add a carbon pigment as the pigment to the film in an amount of 20 wt%. Contains
A printing layer is formed on the film by transferring the film with a pad.

[0008] Further, the pad is made of a material containing at least silicone rubber.

[0009] As described above, 20% is contained in the film containing the fluororesin.
By containing the carbon pigment by weight% or more, the carbon pigment that melts even during firing or hardly flows by itself is sufficiently dispersed in the film, so that the fluidity of the film resin component such as fluororesin is suppressed. In addition, flocculation of the fluororesin on the outermost surface of the film is reduced, the smoothness of the surface is secured, and the trace of the pad can be eliminated.

In particular, carbon pigments have a smaller specific gravity and a smaller particle size than other pigments, so the number of particles increases even with the same amount of addition, so that the effect of suppressing the fluidity of the film component is high. Therefore, the amount of the pigment added can be reduced accordingly.

When a pad containing silicone rubber is used, the transferability of the ink is good and the durability of the pad is also improved, so that a product having a good appearance can be efficiently produced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view of an electric water heater according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an outer case, in which a bottomed cylindrical container 2 is housed. A water level line 3 is printed on a side surface of the container 2 to indicate a standard water supply amount. FIG. 2 is an enlarged cross-sectional view of the container near the water level line 3, and FIG. 3 is a front perspective view of the vicinity of the water level line 3. A heater 4 is integrated below the container 2. Further, a film 5 is formed on the inner surface of the container 2. 6 is container 2
This is the top cover that covers the. A temperature sensor 7 for measuring the temperature of the liquid is attached so as to be in contact with the container 2 from below, and this temperature sensor is connected to a temperature control function unit 8 to control the temperature of hot water. When the tapping button 9 is pressed, the number of rotations of the electric pump 11 connected to the liquid outlet 10 from the container is changed by the pushing and pushing, and the tapping means through which the liquid is discharged from the discharge port 13 through the tapping pipe 12. It has.

Further, a solvent-based paint containing a fluororesin and a pigment using a polyethersulfone resin (hereinafter referred to as "PES") as a heat-resistant polymer material as a solid was prepared. Here, an ethylene tetrafluoride-propylene hexafluoride copolymer resin (hereinafter referred to as "FEP") was used as the fluororesin. The amount of carbon added was as shown in Table 1 for the pigment. Here, the content ratios of the binder and the fluororesin were all the same, and the content ratio of the pigment other than carbon was adjusted to the extent that the amount of added carbon was changed, and the content ratios of the pigments were all the same.

The inner surface of the container 2 was roughened by injecting a sandblast material, and the surface was coated with the paint shown in Table 1 by spray coating and dried. Thereafter, the water level line 3 was printed by the pad transfer method. The ink used here was obtained by dispersing the PES, fluorine, and titanium oxide as a white pigment contained in the coating material in a predetermined composition in an ink solvent. The transfer of the ink was performed using a pad mainly composed of silicone rubber. After printing the water level line 3, it was baked at a predetermined temperature and its appearance was observed.

[0016]

[Table 1]

In the samples shown in (Table 1), the state of occurrence of pad marks was confirmed, and the results are indicated by ○ to ×. Here, ○ indicates “no problem in appearance”, Δ indicates “pat marks are slightly visible”, and x indicates “pat marks are conspicuous”. The results are also shown in (Table 1). FIG. 3 shows the presence or absence of a pad trace near the water level line 3. Here, 14 indicates the trace of the putt.

As is apparent from these results, when the content of carbon was 20 wt% or more, there was no problem in appearance.

In this embodiment, F is used as the fluororesin.
Although the description has been made with the use of EP, the present invention is not limited to this, and other fluorine resins such as tetrafluoroethylene resin (PTFE) and ethylene tetrafluoride-perfluoroalkylvinyl ether copolymer resin (PFA) may be used. Similar effects can be obtained for the used one.

Although the carbon content is shown only up to 30 wt%, the carbon content is not limited to this example, and the carbon content may be increased even if the basic properties such as the adhesion of the film do not matter. good.

In the above description, the fluororesin film is one-coat. However, the fluororesin film is composed of a multilayer including a primer layer and the like, and the top layer is formed on the print layer so that the visibility of printing is not deteriorated. The same effect can be obtained for

The pattern of the print layer has been described by taking the line as shown in FIG. 3 as an example. However, the present invention is not limited to this, and there is a problem even if a necessary pattern such as characters, symbols, and scales is printed. There is no.

In this embodiment, an electric water heater has been described as an example. However, the present invention is not limited to this, and it is not limited thereto. The same effect can be obtained for an electric cooking utensil having a fluororesin coating such as a water bottle, a cake mold, a cooking tray, a knife, a kitchen knife, a rice scoop, etc.

[0024]

As is clear from the above examples, according to the present invention, the fluidity of the coating film components at the time of firing the fluorine coating is suppressed, and as a result, the trace of the pad can be eliminated.

Further, by using a pad made of a substance containing at least silicone rubber, the transferability of the ink is improved and the durability of the pad is improved, so that a pad having a good appearance can be efficiently produced. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an electric water heater showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the vicinity of a water level line 3 in FIG.

FIG. 3 is a front perspective view showing the vicinity of a water level line 3 of an electric water heater according to an embodiment of the present invention. (A) A diagram showing a case where a pad mark appears. (B) A diagram showing a case where a pad mark does not appear.

[Explanation of symbols]

 2 Container 3 Water level 5 Film 14 Putt mark

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Satoshi Shimizu 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 4B055 AA34 BA57 CA05 CA09 CA85 CB21 CD44 DA02 DB02 FA04 FB11 FB36 FB49 FD03 FE03

Claims (2)

[Claims] 1. A coating containing at least a fluororesin, a pigment and a binder component is formed on an inner surface of a container for holding a liquid, and a carbon pigment is used as the pigment in the coating.
An electric water heater containing at least t%, and wherein a printed layer is formed on the film by transferring with a pad. 2. The electric water heater according to claim 1, wherein the pad is made of a material containing at least silicone rubber.