JPH05124168A - Fluoroplastic coated article having gradations, pattern or character displayed thereon and production thereof - Google Patents

Abstract

PURPOSE:To reduce the positional irregularity of gradations after press molding in a fluoroplastic coated article having gradations, a pattern or a character displayed thereon. CONSTITUTION:Fine unevenness is provided to the surface of an aluminum or aluminum alloy plate and a resin layer containing fluoroplastics is provided to the uneven surface said plate as a base coat layer or linear lines passing the' center of gravity of said plate with respect to the straight line parallel through to the rolling direction passing through the center of gravity opened at 45 deg. left and right centering around the center of gravity without providing the resin layer and gradations or the like are printed or applied to the plate within the range formed by two straight lines and, thereafter, a fluoroplastic layer is provided to the plate as a topcoat layer to perform press molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, a jar rice cooker,
Fluorine resin coatings for kitchens such as warm pots, rice cookers, rice cookers, rice cookers, pans, frying pans, hot plates, etc. For details, scales, patterns, letters, etc. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as a technique for displaying a scale, a pattern, characters, etc. on a fluororesin coating, a plate etched in a flat plate state or a plate surface having an anodic oxide film formed thereon after etching, Or mechanical or chemical methods,
Alternatively, a scale, a pattern, characters, etc. are printed or painted on the surface of a resin layer containing a fluororesin as a base coat provided on the entire surface of a plate having fine irregularities by an electrochemical method, and a fluororesin layer is provided as a top coat. There was technology.

[0003]

However, in the past, when printing or painting these scales, patterns, characters, etc., the printing position and the position of the base material in the rolling direction of the aluminum and aluminum alloy sheet have been specified. I didn't, so
There was a problem that the scale position was likely to vary after press molding. In view of the above, the present invention was developed for the purpose of reducing such variations in the positions of scales and the like after press molding.

The fluororesin coating on which the scales, patterns, characters and the like of the present invention are displayed is formed by press molding.
This press-formed composition comprises an aluminum or aluminum alloy plate having fine irregularities formed on the surface by a mechanical method, a chemical method, or an electrochemical method, and an aluminum or aluminum alloy plate on the surface of the fine irregularities. A straight line parallel to the rolling direction (grain direction) that passes through the center of gravity of the aluminum alloy plate and that passes through the center of gravity and opens 45 ° to the left and right, and is printed or painted within the range of these two straight lines It is characterized in that a fluoric resin layer is further provided as a top coat on the entire surface of the plate including the scales, patterns, characters, etc. at desired positions of the article and the printed or painted portion.

Note that at least the following are included as embodiments of the fluororesin-coated article on which the scales, patterns, characters and the like of the present invention are displayed. (A) It is formed by press molding, and this press-formed composition comprises an aluminum or aluminum alloy plate whose surface is provided with fine irregularities by a mechanical method, a chemical method, or an electrochemical method, and A resin layer containing a fluororesin as a base coat is provided on a plate having fine irregularities, and the center of gravity is set to a straight line parallel to the rolling direction (grain direction) passing through the center of gravity of the aluminum or aluminum alloy plate on the coated surface. Find this straight line that opens 45 ° to the left and right,
Within the range of these two straight lines, scales, patterns, characters, etc. at desired positions of the press-molded composition printed or painted, and another layer as a top coat is provided on the entire surface of the plate including the printed or painted part. The fluororesin coating of the present invention as described above, further comprising a fluororesin layer. The base coat may be coated on the entire surface of the plate or may be only the printed part (including the peripheral part).

(B) The fluororesin coating according to the present invention or the above (a), characterized in that a material having an ear ratio (orientation) of 3% or less is used as the aluminum material used.

Further, the method for producing a fluororesin coating having scales, patterns, characters and the like according to the invention of the present application is such that the surface of an aluminum or aluminum alloy plate is finely roughened by a mechanical method, a chemical method or an electrochemical method. After this, on the surface of the plate with this minute unevenness, find a straight line that passes through the center of gravity and is open 45 ° to the left and right with respect to a line parallel to the rolling direction (grain direction) that passes through the center of gravity of the aluminum or aluminum alloy plate. , After printing or painting within the range of these two straight lines, printing or painting scales, patterns, characters, etc. at prescribed positions designed in advance so as to be the desired position after press molding. Another feature is that a fluororesin layer is further provided as a top coat on the entire surface of the plate including the above-mentioned portion and this is press-molded.

At least the following is included as an embodiment of the method for producing a fluororesin-coated product having scales, patterns, characters and the like according to the present invention. (C) After forming fine irregularities on a surface of an aluminum or aluminum alloy plate by a mechanical method, a chemical method, or an electrochemical method, a resin layer containing a fluororesin layer as a base coat is formed on the plate having the fine irregularities. , On this coated surface, find a straight line that opens 45 ° to the left and right through the center of gravity with respect to a straight line parallel to the rolling direction (grain direction) that passes through the center of gravity of the aluminum or aluminum alloy plate, and within the range of these two straight lines The top coat is applied to the entire surface of the plate including the printed or painted portion after printing or painting the scale, pattern, characters, etc. at the prescribed position designed in advance so that it will be the desired position after press molding printed or painted. The method for producing a fluororesin-coated article according to the present invention is characterized in that a fluororesin layer is provided as an additional layer and is press-molded. As a method for providing the fine irregularities, it is desirable to use a chemical or electrochemical method having a larger adhesive force.

(D) The method for producing a fluororesin coating according to the present invention or (c) above, wherein a material having an ear ratio (orientation) of 3% or less is used as the aluminum material used.

[0010]

[Function] With the top coat, the non-adhesiveness of the surface and the degree of pinhole are improved not only at the position where characters are printed but also at other positions. Therefore, PTFE containing no filler is desirable as the top coat.

When the base coat has a color tone and a black eye tone (for example, PTFE containing mica, carbon, etc.), a white scale is printed on the base coat to provide a very easy display with contrast. Further, if there is a base coat, the graduation printed portion is sandwiched between the top coats and becomes stronger and firmly adheres to the upper and lower fluororesin layers to further improve the characteristics.

Since variations in strength and elongation in the rolling direction (grain direction) of an aluminum or aluminum alloy plate are smaller than those in the other directions, a prescribed design is predesigned so that the desired position can be obtained after press forming in the same direction as this direction. When the scales, patterns, characters, etc. are printed or painted on the positions, the dimensional accuracy of the scales after press molding will be smaller and more accurate than printing or painting on the specified positions in other directions.

The same direction as the rolling direction mentioned here means that in FIG.
As close to the rolling direction as possible, that is, the straight line parallel to the rolling direction (grain direction) that passes through the center of gravity of the aluminum or aluminum alloy sheet, passes through the center of gravity, and finds a straight line that opens 45 ° to the left and right. It is important to place all scales, patterns, letters, etc. within the range of. Of course, this does not apply to items that do not require precision after pressing.

Further, it is preferable that the directionality of the aluminum material is as small as possible, specifically, within 3% in terms of the ear rate. That is, even when the scales and the like are arranged in the rolling direction, it is naturally necessary to spread them to some extent, and the accuracy of the scale and the like at a portion slightly away from the rolling direction is reduced when the material has large directivity.

The definition of ear ratio is as follows. Irregularities called ears may appear on the periphery of the container squeezed by the press. Assuming that the length of the crest (ears) measured from the bottom of the cup is h ₁ and the length of the troughs is h ₂ , usually four ears are generated, and thus the ear rate h _e is as shown in Equation 1.

[0016]

[Equation 1]

[0017]

【Example】

(Example 1) The present invention will be described below with reference to examples. As the aluminum material, a circle plate having a plate thickness of 1.2 mm (ASB material manufactured by Kobe Steel, Ltd.) was used. First, using this as an anode, 25 coulombs in ammonium chloride solution /
Electrochemical etching treatment was performed with an electric quantity of cm ² to form fine irregularities on the surface. 15 more in 10% sulfuric acid
Electric current was applied for 1 minute at V to form an alumite layer with a thickness of about 0.5 μm. The ear rate (orientation) of this material was 2%.

To improve the appearance (color tone, luster, etc.) of the pressed product, tetrafluoroethylene resin (PTFE) containing a pigment such as mica or carbon as a filler was coated as a base coat (coating thickness). 25 μm). Furthermore, at a predesigned position in a flat plate state so that it will be in a desired position after pressing, and as close as possible to the rolling direction (grain direction) of the aluminum or aluminum alloy sheet, that is, the center of gravity of the aluminum or aluminum alloy sheet. The straight line parallel to the rolling direction (grain direction) and passing through the center of gravity and opening 45 ° to the left and right is obtained. Within the range of these two straight lines, tetrafluoroethylene resin (PTFE) 20%,
Scale with a fluororesin paint containing 80% solids of TiO ₂ .
I wrote the characters using the screen printing method. Finally, the entire surface of this flat plate was coated with a tetrafluoroethylene resin (PTFE) containing no filler as a top coat (coating thickness 10 μm). (See Figure 2.)

The fluorine resin used in the base coat or the top coat is not only tetrafluoroethylene resin (PTFE),
Three of tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA) and tetrafluoroethylene-6-propylene propylene copolymer (FEP) are more preferable, and these may be used alone or in combination.

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

The coating method includes spray coating, roll coating, spin coating and the like, and any method may be used. In addition, the baking temperature of the fluororesin after coating (380
~ 400 ° C).

This fluororesin coating was press-molded to form the inner pot of a jar rice cooker (see FIG. 3). The fluororesin coating had good adhesion and did not come off even by press molding. The scale and letters written on the flat plate before pressing are at the desired positions of the press-molded product, and the dimensional variation with respect to the required scale position is δ = 0.28 mm, n = 100.
In addition, the character part was white compared to the metallic black base coat, and a very easy-to-read scale and character display were obtained. The non-tackiness and the adhesiveness of the surface of the part on which letters were written on the surface of the base coat were also good, not different from other parts.

Further, by selecting a pigment or the like in the scale material, it is naturally possible to display not only the above white color but also various color tones. As the material for displaying the scale or the like, any material that can withstand the baking temperature of the subsequent fluororesin may be used, and the above-mentioned silicone-based paint, fluororesin-based paint or the like can be used.

(Comparative Example 1) In Example 1, scales, characters, etc. were printed at a position in the vicinity of 45 ° to 55 ° with respect to the rolling direction (grain direction) of the aluminum or aluminum alloy plate as a reference. The dimensional variation with respect to the scale position required for painted and press-formed products is δ
= 0.85 mm and n = 100.

(Comparative Example 2) In Example 1, scales, characters, etc. were printed at a position in the vicinity of 80 ° to 100 ° with respect to the rolling direction (grain direction) of the aluminum or aluminum alloy plate, or The dimensional variation with respect to the scale position obtained by coating and press molding was δ = 0.50 mm and n = 100.

(Example 2) As an aluminum material, a circle plate having a thickness of 1.2 mm (3004 material manufactured by Sumitomo Light Metal Co., Ltd.) was used. First, this was blasted to form irregularities on the surface. In order to improve the adhesive strength with the blast-treated surface, a primer product number EK-1909BKN manufactured by Daikin Industries, Ltd. was coated as a base coat on this (coating thickness 20 μm).

Furthermore, at a predesigned position of a flat plate so as to have a desired position after pressing, and as close as possible to the rolling direction (grain direction) of the aluminum or aluminum alloy plate, that is, aluminum or aluminum alloy. Obtain a straight line that passes through the center of gravity and opens 45 ° to the left and right with respect to a straight line parallel to the rolling direction (grain direction) that passes through the center of gravity of the plate. Within the range of these two straight lines, tetrafluoroethylene resin (P
TFE) 20%, TiO ₂ 80% solid content of a fluororesin paint was used to write scales, letters, etc. using a screen printing method. Finally, the entire surface of this flat plate was coated with a filler-free tetrafluoroethylene resin (PTFE) as a top coat (coating thickness 10 μm).

This fluororesin coating was press-molded to form the inner pot of a jar rice cooker. The fluororesin coating had good adhesion and did not come off even by press molding. Also, the scale and letters written on the flat plate before pressing are at the desired positions of the press-molded product, and the letters are white with respect to the metallic black base coat, and the dimensional variation with respect to the required scale position is δ = 0.33 mm, n = 1
It was 00, and a very easy-to-read scale and character display were obtained. The non-tackiness and the adhesiveness of the surface of the part on which letters were written on the surface of the base coat were also good, not different from other parts.

Further, it is naturally possible to display not only the above white but also various color tones by selecting a pigment or the like in the scale material. Any material that can withstand the baking temperature of the subsequent fluororesin may be used as the material for indicating the scale, and the above-mentioned silicon-based paint, fluororesin-based paint, or the like can be used.

(Comparative Example 3) In Example 2, scales, characters, etc. were printed at a position in the vicinity of 45 ° to 55 ° with respect to the rolling direction (grain direction) of the aluminum or aluminum alloy plate as a reference. The dimensional variation with respect to the scale position required for painted and press-formed products is δ
= 0.93 mm, n = 100.

(Comparative Example 4) In Example 2, scales, characters, etc. were printed at a position in the vicinity of 80 ° to 100 ° with respect to the rolling direction (grain direction) of the aluminum or aluminum alloy plate, or The dimensional variation with respect to the scale position obtained by coating and press molding was δ = 0.58 mm and n = 100.

[0032]

As described above, according to the present invention, it is possible to obtain a fluororesin coating having scales, patterns, characters and the like having the following effects and a method for producing the same. For example, it is possible to display scales, patterns, characters and the like at extremely accurate positions on a fluororesin coating such as an inner pot of a rice cooker without impairing the characteristics of the fluororesin coating. Therefore, it is possible to use it for a wide range of purposes such as graduation display of kitchen appliances, description writing, and pattern making.

[0033]

[Brief description of drawings]

FIG. 1 is a plan view of an aluminum or aluminum alloy plate for explaining the arrangement of characters or the like printed or painted in the present invention.

FIG. 2 is a schematic view of the present invention in a flat plate state.

FIG. 3 is a schematic view of a press-formed product when the flat plate of FIG. 1 is pressed into a pot shape in a jar rice cooker.

[Explanation of symbols]

1. Aluminum circle plate 2. Rolling direction of aluminum circle plate (grain direction) 3. 3. Scales, pattern letters, etc. written on the surface of the aluminum circle with minute irregularities. Fluorine resin as top coat, eg PTFE

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B32B 31/12 7141-4F

Claims (4)

[Claims] 1. A press-molded structure, wherein the press-molded structure has a surface formed by a mechanical method, a chemical method,
Or, an aluminum or aluminum alloy plate with fine irregularities formed by an electrochemical method and a surface of the plate with the fine irregularities parallel to the rolling direction (grain direction) passing through the center of gravity of the aluminum or aluminum alloy sheet. A straight line that passes through the center of gravity with respect to the straight line and is opened at 45 ° to the left and right is obtained, and the scale, pattern, characters, etc. at the desired position of the press-molded composition printed or painted within the range of these two straight lines and this printed or A fluororesin coating having scales, patterns, characters and the like, which is further provided with a fluororesin layer provided as a top coat on the entire surface of a plate including a painted portion. 2. A press-molded structure, wherein the press-molded structure has a mechanical surface, a chemical surface,
Alternatively, an aluminum or aluminum alloy plate having fine irregularities formed by an electrochemical method, a resin layer containing a fluororesin as a base coat provided on the plate having the fine irregularities, and aluminum or aluminum on the coated surface Rolling direction (grain direction) that passes through the center of gravity of the aluminum alloy plate
A straight line that is open 45 degrees to the left and right is obtained by passing through the center of gravity with respect to a straight line parallel to, and the scale, pattern, letters, etc. at the desired position of the press-formed component printed or painted within the range of these two straight lines, 2. The fluororesin coating having scales, patterns, characters and the like according to claim 1, further comprising a fluororesin layer provided as a topcoat on the entire surface of the plate including the printed or painted portion. 3. The surface of an aluminum or aluminum alloy plate is provided with fine irregularities by a mechanical method, a chemical method or an electrochemical method, and then the surface of the plate having the fine irregularities is provided with an aluminum or aluminum alloy sheet. The straight line parallel to the rolling direction (grain direction) passing through the center of gravity and passing through the center of gravity and opening 45 ° to the left and right is obtained, and the desired position after press molding printed or painted within the range of these two straight lines After printing or painting graduations, patterns, letters, etc. at the prescribed positions designed in advance, another fluororesin layer is provided as a top coat on the entire surface of the plate including this printed or painted portion, and this is pressed. A method for producing a fluororesin-coated article having markings, patterns, characters, etc., characterized by being molded. 4. A resin layer containing a fluororesin as a base coat on a plate having fine irregularities after the fine irregularities are formed on the surface of an aluminum or aluminum alloy plate by a mechanical method, a chemical method or an electrochemical method. Then, on this coated surface, find a straight line that passes through the center of gravity and opens 45 ° to the left and right with respect to a straight line parallel to the rolling direction (grain direction) that passes through the center of gravity of the aluminum or aluminum alloy plate. After printing or painting the scale, pattern, letters, etc. at the prescribed position designed in advance so that it will be at the desired position after press molding, the top is covered on the entire plate including this printed or painted portion. The scale, the pattern, and the pattern according to claim 3, characterized in that another fluororesin layer is provided as a coat, and this is press-molded.
A method for producing a fluororesin-coated article on which characters and the like are displayed.