JPH03224667A - Method for displaying graduations, pattern, letter, etc., on fluororesin coated body - Google Patents

Abstract

PURPOSE:To display graduations, a pattern, letters, etc., on a fluororesin coated body without deteriorating the characteristics of the fluororesin coat by coating a substrate with a fluororesin compsn., drawing the graduations, etc., in an unsintered state and carrying out sintering. CONSTITUTION:A substrate is coated with a fluororesin compsn., graduations, a pattern, letters, etc., are drawn on an unsintered state and sintering is carried out. The graduations, etc., can he displayed on the resulting fluororesin coated body such as the inner pot of a rice cooker without deteriorating the characteristics of the fluororesin coat and they are easy to see as compared with the conventional stamp. This method can widely be utilized to graduate and pattern a cooker, etc., and to give an operating manual.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for displaying scales, patterns, characters, etc. on a fluororesin coating.

``Prior Art'' Conventionally, the only method for displaying scales or the like on a fluororesin coating was to physically create irregularities on the coating using a press or the like and utilize the shadows, that is, by stamping.

This is because the non-adhesive nature of fluororesin makes it impossible to display scales or other markings by printing on its surface.Also, even if this were possible, the non-adhesiveness of the printed area would be reduced. When used in kitchens, for example, in the inner pot of a rice cooker, rice will stick to this area, which is undesirable.

``Issues to be Solved by the Invention'' For these reasons, all inner pots of rice cookers have been marked with stamps, but this method also has serious problems.

First, since the coating is deformed with a very large curvature at the stamped part, the fluororesin coating is also stretched at the same time, which tends to cause peeling of the adhesive interface with the substrate and the occurrence of pinholes and cracks in the coating. Moisture and rice can enter from these parts, causing corrosion of the substrate, peeling of the coating, discoloration, etc.

Second, the display is difficult to see because of the shadows caused by the unevenness.

Rice pots have become particularly multi-functional in recent years, and as a result, the scales and other markings are not only for rice cooking, but also for sekihan, ojiya, glutinous rice, etc., and are engraved in 3 or 4 places. As these problems have become more and more common, these problems have become particularly apparent. In view of the above, the present invention is a method developed to solve these problems.

``Means for Solving the Problems'' That is, the present invention provides a fluorine resin composition, which is characterized in that a fluororesin composition is coated on a substrate, scales, patterns, characters, etc. are displayed in an unsintered state, and then sintered. Graduation, patterns on resin coatings,
This is a method of displaying characters, etc.

Note that the embodiments of the present invention include at least the following.

b) The display method of the present invention, characterized in that a pigment or a resin composition containing a pigment is embedded in a fluororesin coating in an unsintered state and then sintered.

(b) A pigment or a resin composition containing a pigment is laminated on the fluororesin coating in an unsintered state, and then a fluororesin composition is further laminated thereon, and then sintered. The above display method of the present invention.

(c) Using an already sintered fluororesin coating as a substrate, a fluororesin composition having a color different from that of the substrate is formed into the shape of a scale pattern, letters, etc., or the shape of a scale, pattern, letter, etc. The display method of the present invention is characterized in that the display method is coated and then sintered.

The present invention will be explained in detail below.

The inventors of the present invention have conducted intensive studies on the above-mentioned conventional problems, and have found that by coating a fluororesin composition on a substrate, displaying scales, patterns, characters, etc. in an unsintered state, and then sintering the fluororesin composition, We came up with the idea that scales, patterns, letters, etc. can be displayed without reducing the non-adhesiveness of the surface of the resin object, and thus completed the present invention.

In the present invention, examples of the fluororesin used include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP)
, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), chlorotrifluoroethylene (PCTFE) or ethylene-chlorotrifluoroethylene copolymer (ECTFE), etc. .

Fluororesins are not only resin powders, but also include aqueous dispersions of fluororesins obtained by emulsion polymerization, dispersions of fluororesin powders dispersed in aqueous media, organosols of fluororesins, and emulsions of organosols in water. It can also be used in the form of

A fluororesin coating is formed by adding pigments, adhesion aids, etc. to such a fluororesin as necessary.

Fluororesins usually have their crystalline melting point, for example 3 for PTFE.
It is sintered at 27°C to 343°C or higher to form a strong coating. The film thus obtained is extremely non-adhesive, but on the other hand, when a pigment or a resin composition containing a pigment is to be laminated to display a scale or the like, the non-adhesive property makes lamination difficult.

However, in the unsintered state, the fluororesin coating is in a state of agglomeration of minute particles, so the non-adhesiveness is relatively low, lamination is easy, and the coating is also easily deformed. As shown in the figure, it is also possible to embed pigments.

Of course, if pigments are simply layered, the non-adhesive properties of the surface will be significantly lost, so it will be necessary to further coat the layer with a fluororesin as shown in (b).

However, as a pigment, a ceramic material that can be cured at a temperature below the sintering temperature of the fluororesin and has a relatively non-adhesive surface, such as Sumiceram (trademark) manufactured by Sumitomo Chemical, is used to display scales, etc. In some cases, it is not essential to further coat the fluororesin thereon.

In addition, as shown in Q →, by using an already sintered fluororesin coating as a substrate, coating it with a fluororesin composition having a different color, and creating a display shape such as Ii &, the color of the base can be changed. Various processing is possible, such as obtaining a display with a high contrast.

"Example" Examples of the present invention will be described below.

Example 1: A fluororesin composition consisting of 60 parts by weight of PTFE, 6% by weight of surfactant, and 34 parts by weight of water was coated on an etched aluminum plate, and then dried at 150°C for 2 minutes to form an unsintered sheet. A fluororesin coating (coating thickness 25 μm) was obtained. After covering this surface with a polyethylene sheet and pressing it into a valley shape, the polyethylene sheet is peeled off, red iron oxide (iron oxide powder: Fe2O,) is embedded in the fluororesin coating in a scale shape, and then sintered to form a fluororesin. A coating was obtained.

The non-adhesiveness of the scale part was also good.

Example 2: A scale display was printed on the unsintered fluororesin coating obtained in exactly the same manner as in Example 2 using a color printing ink containing carbon, and then the fluororesin was applied to the display area to a thickness of about 10 μm. A fluororesin coating was obtained by spray coating and sintering.

The scale was clear and the non-adhesion of the surface was exactly the same as that of the fluororesin itself.

Example 3: A colorless fluororesin coating was formed, and after sintering, a cover with a single character shape punched out was pressed against the side of the article, which was formed into a valley shape by one-press molding, and a fluororesin disperge run was colored black. It was displayed in the shape of letters by wiping it.

This was sintered to obtain a clear character display. The non-adhesiveness of the display area was also good.

Example 4: A black-colored fluororesin coating was formed, and after sintering, a green-colored fluororesin composition was sprayed to a thickness of about 20μ and dried.

Only the unsintered fluororesin in the shape of a scale was removed and then sintered to obtain a fluororesin coating with good non-adhesion and black scale markings on a green background.

A fluororesin composition containing 2% by weight of carbon was used for the black coloring, and a fluororesin composition containing 3% by weight of titanium oxide-coated mica (Iriodin 235 manufactured by Merck & Co.) was used for the green coloring.

"Effects of the Invention" As explained above, according to the present invention, lips, patterns, characters, etc. can be displayed on a fluororesin-coated object, such as the inner pot of a rice cooker, without impairing the characteristics of the fluororesin coating. Moreover, it is easier to see than traditional engravings. Therefore, it can be used in a wide range of applications, such as marking and displaying kitchen utensils, writing instructions, and creating patterns.

In the present invention, the shape of the fluororesin-coated article is not particularly limited, and may of course be a finished product such as the inner pot of a rice cooker, or a fluororesin-coated aluminum plate.

Claims (1)

[Claims] (1) Scales, patterns, characters, etc. are displayed on a fluororesin-coated product by coating the fluororesin composition on a substrate, displaying scales, patterns, characters, etc. in an unsintered state and then sintering the fluororesin composition. How to display.