JP3146536B2 - Method for producing fluororesin coating with scales, patterns, letters, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner pot, a pot, a frying pan, and the like of a jar rice cooker, a heat retaining jar, a rice cooker, a rice cake cooker and the like.
More particularly, the present invention relates to a fluororesin coating on which scales, patterns, characters, etc. are displayed, and a method for producing the same.

[0002]

2. Description of the Related Art Hitherto, as a means for displaying a scale or the like on a fluororesin coating, there has been a means for physically providing irregularities on a coating by a press or the like and utilizing the shadow, that is, a means by engraving.

[0003] This is because it is impossible to display scales or the like by printing on the surface of the fluororesin due to its non-adhesiveness.
Even if this is possible, the non-adhesiveness of the printing portion will be reduced, so that when used in kitchen applications, for example, in the inner pot of a rice cooker, rice sticks to this portion, which is not preferable.

[0004] Also, a scale, pattern, character, or the like is printed or painted on an aluminum or aluminum alloy plate provided with fine irregularities on the surface, and a fluororesin coating for displaying a scale, etc., on which a fluororesin layer is provided. was there.

However, in this method, graduations, patterns, characters, and the like are directly printed on the fine uneven surface, and since the printing resin generally contains a large amount of pigment, the adhesive force between the fine uneven surface and the printing resin is insufficient. Therefore, there is a problem that the printing resin is easily peeled off, which is not preferable.

[0006]

For the reasons described above, all the pots in the rice cooker have been marked by engraving, but this means also has a serious problem.

[0007] First, since the coating is deformed at the marked portion with a very large curvature, the fluororesin coating is also stretched at the same time.
Peeling of the bonding interface with the substrate and occurrence of pinholes and cracks in the coating are apt to occur, and moisture and rice juice infiltrate from this portion, causing corrosion of the substrate, peeling of the coating, discoloration and the like. Second, display is difficult to see because of shading due to unevenness.

In recent years, rice cookers have become multifunctional in recent years, and accordingly, the scale and the like are displayed not only for rice cooking but also for red rice.
These types of problems are becoming more apparent since stamps are often made at three or four locations across a wide variety of types such as uncles and sticky rice. In view of the above, the present invention is a fluororesin coating displaying scales, patterns, characters, etc., and a method for producing the same, developed to solve such problems.

[0009]

[0010]

[0011]

According to the present invention, there is provided a method for producing a fluororesin coating on which graduations, patterns, characters, etc. are displayed, by forming fine irregularities on the surface of an aluminum or aluminum alloy plate by a chemical method or an electrochemical method. After the application, an anodic oxide film is further formed on the surface, and a fluororesin containing at least a tetrafluoroethylene-perfluoroalkoxyethylene copolymer or a tetrafluoroethylene-6-fluoropropylene copolymer as a base coat on the plate. After providing a layer, printing or painting graduations, patterns, characters, etc. at predetermined positions pre-designed to be at a desired position after press molding on the coated surface, including the printed or painted portion It is characterized in that a fluorine resin layer is further provided as a top coat on the entire surface of the plate, and this is press-molded.

[0012]

Referring to FIG. 1, a description will be given of a fluororesin coating on which scales, patterns, characters and the like are displayed according to the present invention with reference to FIG. A resin layer 3 containing a fluororesin is provided as a base coat on a plate having a surface 2 having fine irregularities, and a fine irregular surface pre-designed on the coated surface so as to have a desired position after press molding. After printing or painting scales, patterns, letters, etc. 4 at the position of, a fluorine resin layer 5 is further provided as a top coat on the entire surface of the plate including the printed or painted portion, and this is press-formed to form a rice cooker, pot, etc. The present invention is characterized in that a fluororesin coating is obtained and obtained.

[0014]

[0015]

The present invention has the following four features. A structure in which graduations, patterns, characters, etc. are printed or painted on a surface coated with a resin layer containing a fluorine resin as a base coat, and a fluorine resin layer is further coated as a top coat, that is, the upper and lower base coats and the resin of the top coat The scales, patterns, characters, etc. are sandwiched between the layers, so that the scales, patterns, characters, etc., and the resin layers above and below are firmly adhered to each other, and the display part is bonded to the upper and lower resins. Sex is not lost.

Since a surface coated with a resin layer containing a fluorine resin as a base coat is printed or painted with scales, patterns, characters, etc., and further coated with a fluorine resin layer, the non-adhesiveness of the surface of the display portion is reduced. Not lost.

By using a fluororesin layer of the top coat which does not substantially contain a filler, printed or painted scales, patterns, characters and the like can be clearly seen from the surface.

Since graduations, patterns, characters, and the like are printed or painted at predetermined positions on the surface of the resin layer containing the fluororesin of the base coat designed in advance so as to be at a desired position after press molding, this fluororesin coating is applied. The scale, pattern,
Characters can be displayed.

[0019]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below. 1.2mm thick aluminum material (Kobe Steel, Ltd.)
ASB material). First, using this as an anode, an electrochemical etching treatment was performed in an aqueous solution of ammonium chloride with an amount of electricity of 25 coulombs / cm ² to form fine irregularities on the surface. Further, energize at 15V for 1 minute in 10% sulfuric acid,
An alumite layer was formed to a thickness of about 0.5 μm.

On top of this, in order to improve the appearance (color tone, glitter, etc.) of the pressed product, a tetrafluoroethylene resin (PTFE) containing a pigment such as mica or carbon as a filler was coated as a base coat (coating thickness). 25 μm). Further, a tetrafluoroethylene resin (P) is placed on a pre-designed position of a flat plate so as to be at a desired position after pressing.
TFE) 20%, wrote graduated with a fluorine resin paint containing solids _TiO 2 80%, characters and the like by a screen printing method. Finally, the entire surface of the flat plate was coated with a tetrafluoroethylene resin (PTFE) containing no filler as a top coat (film thickness: 10 μm).

The fluororesin used in the top coat is a tetrafluoroethylene resin (PTFE), a tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA), a tetrafluoroethylene-6-fluoropropylene copolymer (FEP) are preferred, and these may be used alone or in combination.

The thickness of the coating film is preferably 20 μm to 35 μm for the resin layer containing the fluororesin of the base coat. Further, the fluororesin of the top coat is preferably 10 μm to 25 μm.

As a method of coating, there are spray coating, roll coating, spin coating and the like, and any of them may be used. After the application, the baking temperature of the fluororesin (380
-400 ° C).

This fluororesin coating was press-formed to form an inner pot of a jar rice cooker. The fluorine resin coating had good adhesive strength and did not peel off even by press molding. The scales and characters written on the flat plate before pressing were at desired positions on the press-formed product, and the character portion became white with respect to the metallic black base coat, and very easy-to-read scales and character display were obtained. The non-tacky and adhesive properties of the surface where the characters were written on the surface of the base coat were not different from those of the other portions, and were good.

By selecting a pigment or the like in the scale material, not only the above white color but also various color tones can be displayed. As a material for displaying the scale, any material can be used as long as the temperature can be maintained at the subsequent baking temperature of the fluororesin, and the above-mentioned silicon-based paint and fluorine-resin paint can be used.

[0026]

[0027]

[0028]

[0029]

[0030]

As described above, according to the present invention, it is possible to obtain a fluororesin coating on which graduations, patterns, characters and the like are displayed, and a method for producing the same, having the following effects. For example, scales, patterns, characters, etc. can be displayed on a fluororesin coating such as an inner pot of a rice cooker without impairing the characteristics of the fluororesin coating at all. The adhesion of the layer is strong, and there is no worry that the display portion is peeled off. Therefore, a wide range of uses such as scale display, explanation writing, and pattern creation of kitchen appliances and the like can be performed.

[0031]

[Brief description of the drawings]

FIG. 1 illustrates a cross-sectional view of a fluororesin coating displaying scales, patterns, characters, and the like according to the present invention.

[Explanation of symbols]

1. Aluminum plate 2. 2. Fine irregularities 3. a resin layer containing a fluorine resin as a base coat, for example, PTFE 4. Scales, patterns, letters, etc. written on the surface of the resin layer containing the fluorine resin of the base coat. Fluororesin layer as top coat, eg PTFE

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B32B 15/08 B32B 15/08 H 102 102B 31/20 31/20 (56) References JP-A-54-31447 (JP, A (58) Fields investigated (Int. Cl. ⁷ , DB name) A47J 27/00 A47J 36/02 B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A after providing fine unevenness by chemical methods or electrochemical methods of aluminum or an aluminum alloy plate surface, further, the anodic oxide film is formed on the surface, at least tetrafluoroethylene as a base coat to the plate -Pa
-Fluoroalkoxyethylene copolymer or tetrafluoride
A fluororesin layer provided comprising styrene -6 fluoride propylene copolymer, printing scale, patterns, characters and the like on the coated surface to a predetermined position that is designed in advance to a desired position after press forming Alternatively, after coating, a fluororesin layer is further provided as a top coat on the entire surface of the plate including the printed or painted portion, and this is press-molded. Production method.