JPH03288624A - Display method of graduation, pattern and letter to flourine resin coated material - Google Patents

Abstract

PURPOSE:To melt and join only parts of graduations, patterns and letters to fluorine resin of a base, by a method wherein the surface of a fluorine resin coated material of the base is provided with a fluorine resin layer which has a different color tone from that of the fluorine resin and the fluorine resin layer is heated locally at the melting temperature of the fluorine resin or higher under an unsintered state along the graduations, patterns and letters by a local heating device such as a laser. CONSTITUTION:A flat plate is coated with fluorine resin after molding the same by press processing or coasting and the same is fired. Then the surface of this coated material is coated with fluorine resin having a different color tone from that of the surface. In this instance, since the fluorine resin is transparent, coloring is performed by adding a pigment to the resin. As a coating method, it is performed by either coating a fluorine resin dispersion or laminating films together. Then the coated fluorine resin is heated locally at the melting temperature of the fluorine resin or higher, only parts of graduations, patterns and letters established beforehand along those and only those parts are melted and joined to the fluorine resin becoming a base. It is most preferable that the laser is scanned along the graduations decided beforehand as a locally heating device.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for displaying scales, patterns, characters, etc. on the surface of 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 the fluororesin makes it impossible to display scales or the like by printing on its surface.

Furthermore, even if this were possible, the non-adhesiveness of the printed area would be reduced, so when used in kitchen applications, for example, in the inner pot of a rice cooker, rice would stick to this area, which is not preferable.

``Problems to be Solved by the Invention'' For these reasons, all inner pots of rice cookers have been marked with markings, 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 plate material and the occurrence of pinholes and cracks in the coating. Moisture and rice soup may enter from these parts, causing corrosion of the substrate, peeling of the coating, discoloration, etc.

Second, the display is difficult to see because it is based only on shading caused by 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. These problems are becoming more and more obvious.

In view of the above, the present invention has been developed to solve these problems.

``Means for Solving the Problems'' That is, the present invention further provides a fluororesin layer having a different color tone from that of the fluororesin on the surface of a fluororesin coating that is a substrate, and lasers the fluororesin layer in an unsintered state. It is characterized by heating locally along the scales, patterns, characters, etc. to a temperature higher than the melting temperature of the fluororesin using a localized heating means, and melting and bonding only the scales, patterns, characters, etc. with the fluororesin of the substrate. This is a method of displaying scales, patterns, characters, etc. on fluororesin coatings.

The present invention will be explained in detail below.

In the present invention, a fluororesin coating is obtained by a conventional method without slicing.

In this method, a flat plate is coated with a fluororesin, fired, and then pressed. Alternatively, there is a method of press working or molding with a casting or the like, then coating with a fluororesin and firing, any of which may be used.

Next, the surface of this coating is coated with fluororesins of different colors. In this case, since the fluororesin is transparent, it is colored by adding a pigment or the like to the resin.

Examples of this pigment include titanium oxide, carbon, and chromatic mica, but any pigment may be used as long as it has a different color tone from that of the fluororesin serving as the substrate. Further, as a coating method, any method such as applying a fluororesin dispersion or laminating a film may be used.

Next, this coated fluororesin is locally heated along preset scales, patterns, and letters to a temperature higher than the melting temperature of the fluororesin, and only this area is melted and bonded to the fluororesin that serves as the substrate. let

In this case, four parts are prepared in advance on the fluororesin surface that will become the substrate using the conventional side step method, etc., and these parts are coated with resins of different colors and heated along the recessed parts. It is more preferable to do this from the viewpoint of preventing the coated resin (3) from falling off during actual use.

In addition, it is difficult to coat only parts such as scales from an economic point of view, so the coating is applied to the surrounding areas of predetermined scales, etc., and local heating is performed in this state, and the coating is applied to areas other than the heated parts. A method of removing the resin is preferred.

In addition, local heating methods include methods such as heating the entire body or only the scale using radiant heat, heating from the outside using heat transfer, and scanning with a laser. The most preferable method is to scan the radar i along the lines, etc., because even thin lines are clear and heating is efficient.

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), polychlorotrifluoroethylene (PCTFE) (4) or ethylene-chlorotrifluoroethylene copolymer (ECTFE) ) etc.

Due to the non-adhesion and corrosion resistance characteristics of fluororesin, the display area also has excellent non-adhesion and corrosion resistance. Because it is a fluororesin comrade,
It is fused to the fluororesin coating of the substrate and has excellent adhesive strength.

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

A fluororesin composition consisting of 60% by weight of PTFE, 6% by weight of surfactant, and 34% by weight of water was coated on an etched aluminum plate, sintered and press-molded to obtain an inner pot of a jar rice cooker. A water level scale was provided on the inner wall by concave markings to obtain an inner pot with markings.

A PTFE dispersion containing 4% titanium oxide was applied to the entire surface of the inner surface by spraying, water was dried, and a CO2 laser with an output of about 10 watts was irradiated along the water level scale. Only the irradiated area was melted and baked together with the underlying fluororesin.

Thereafter, the remaining unsintered fluororesin was removed by wiping to obtain a white display such as a scale of the present invention.

This product is much easier to see than conventional markings, and there was no corrosion or falling off of the display resin after 100 actual rice cooking tests.

"Effects of the Invention" As explained above, according to the present invention, for example, the fluororesin coating of the inner pot of a rice cooker has excellent adhesion to the fluororesin coating serving as a substrate, and the non-adhesion of the surface is reduced. It is possible to obtain a fluororesin coating that has almost no scratches, is resistant to damage such as abrasion or peeling during cooking or cleaning, has excellent durability to disappear, has good corrosion resistance, and displays extremely easy-to-read scales, patterns, characters, etc. Therefore, it can be widely used for displaying scales on kitchen utensils, writing instructions, creating patterns, etc.

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.

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Claims (1)

[Claims] (1) A fluororesin layer with a different color tone from the fluororesin is further provided on the surface of the fluororesin coating that is the substrate, and this fluororesin layer is heated in an unsintered state by local heating means such as a laser to form scales, patterns, and letters. scales, patterns, etc. on a fluororesin coating, characterized by locally heating the fluororesin to a temperature higher than the melting temperature of the fluororesin, and melting and bonding only the scales, patterns, characters, etc. with the fluororesin of the substrate; How to display characters, etc.