JPS63280627A - Highly bright laminated metal plate and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a highly bright laminated metal plate, the whole of which is smoothened, by pressurizing from the surface through a transparent hard layer and burying a hard discontinuous layer into a comparatively soft layer. CONSTITUTION:A multi-layer film, laminated in the order of a layer B, a base thermoplastic resin layer a layer C, a printing ink layer and a layer E, a surface thermoplastic layer, is placed on a metal plate with said layer B facing the metal place surface,and after pressurizing with a planished roll or a flat plate and under the state of retaining the plate temperature T between the melting points of polymers constituting the layers B and E, the same is cooled and manufactured. A planished roll or the flat plate with sufficient smoothness finished by gloss chrome plating or the like is used. As the surface is smooth, visible incident light coming from upper surface directions of the laminated metal plate is passed through the transparent layer E with smooth surface and is incident into the layers B and C to produce the contrast and tone exactly as they are.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a commercial metal plate and a method for manufacturing the same.
In more detail, it is especially suitable for the exterior of home appliances such as electric refrigerator doors and air conditioner covers, steel furniture, elevator interiors, building interiors, etc. The present invention relates to a plastic laminated metal plate suitable for required uses and a method for manufacturing the same.

[Prior art]

In the present invention, the sharpness of the image refers to the sharpness of the specular reflection image reflected on the decorative surface, and its evaluation is performed using the portable sharpness gloss meter PGD-1 manufactured by the Japan Color Research Institute. The measurement was carried out using Type 4.

Conventionally, the common method for producing this type of decorative steel sheet is to coat a metal sheet with acrylic or polyester paint using a roll coater, flow coater, roll curtain, etc., and then cure it. In this case, the surface roughness of the metal plate has a particularly large effect on image clarity, and the roughness (Ra)
is small and PPI (peaks per inch
) It has been found that increasing y2 is a good idea. At the same time, research has been conducted on paints, including resins, pigments, pigment concentrations, leveling properties, hiding properties, etc.

However, such a method does not necessarily provide sufficient high definition, and also produces minute surface defects that are unacceptable for high-grade painted metal plates! The problem was that it was unavoidable.

10,000 thermoplastic resin films are laminated on all metal plates for high-definition laminated metal plates! Attempts have also been made to obtain

One method is to press a single-layer or multi-layer resin film, such as a vinyl chloride film, using a mirror finish roll at a temperature higher than the melting point of the laminated double vinyl chloride resin.

In this case, the surface layer will undulate due to the adhesion between the PVC resin and the mirror finish roll! The finish will not be smooth, and
The disadvantage was that sufficient image clarity could not be obtained.

Furthermore, the mirror finish? Improved image clarity! There is also a method in which a single-layer or multi-layer resin film is laminated onto a metal plate and immediately cooled to maintain the sharpness of the resin film. However, in this case, sufficient image clarity cannot be obtained due to the effects of the surface roughness of the metal plate, the unevenness of the adhesive used to bond the metal plate and the resin film, and the undulations of the resin film. was there.

Also, with the coating of paint and the lamination of transparent thermoplastic resin film? A method of combining them is possible. Namely, colored paint! A transparent thermoplastic resin film with a printing ink layer applied to a cured metal plate! In this method, the materials are laminated, pressed with mirror-finished rolls, and immediately cooled. In this case, the unevenness caused by the local presence or absence of printing ink and its density causes unevenness on the outer layer side of the transparent thermoplastic resin film on the surface! As a result, the finish is not smooth and sufficient image clarity cannot be obtained.

Furthermore, surface unevenness caused by the combined effect of the above-mentioned surface roughness, unevenness of the adhesive, undulation of the resin film, and unevenness due to the printing ink dotting effect was also observed.

In other words, conventional technology requires various improvements! Laminated metal plate with good image clarity even under stress! It was extremely difficult to obtain.

[Purpose of the invention]

The object of the present invention is to provide a relatively easy solution to the problems of the prior art! The object of the present invention is to provide a plastic laminated metal plate with high image clarity and a method for manufacturing the same.

[Means for solving problems]

In order to obtain a laminated metal plate with high image clarity, the present inventors
As a result of various research studies, we found that four thermoplastic resin layers (Blm), a continuous or discontinuous printing ink layer (C
layer), transparent & thermoplastic resin layer (El), the melting temperature TB ('C) of the resin constituting layer B is
), the melting temperature Tg ('C) of the resin constituting El-χ is 'rE-'rB≧50, and the visible light transmittance of the E layer is 80 to 98%2, and the surface roughness (Ra max) is 5/&A If the resin film is smaller than the nail, after lamination, 'r
By maintaining the temperature at a temperature such that g>'r≧TB, pressurizing it with a mirror finish roll, and then cooling it, you can obtain a laminated metal plate Z with a high degree of sharpness! This is what I discovered.

At this time, a metal plate, a one-source thermoplastic resin layer (B layer), a printing ink layer (C layer) and a transparent T74 thermoplastic resin layer (E layer)
, printing ink eyebrow (C layer) and 44 thermoplastic resin layer (B layer)
An adhesive layer (layer A, layer D) is used between the two as necessary.

The present invention as described above will be explained in more detail.

The Johatsu thermoplastic resin layer (B layer) includes Mionmei, plasticized vinyl chloride resin, and low-density polyethylene.

Examples include medium-density polyethylene, high-density polyethylene, polypropylene, polyamide resin, acrylic resin, etc., and pigments, stabilizers, plasticizers, etc. are blended accordingly.

Further, there are cases where the film is formed in advance by extrusion or calendaring and then laminated onto a metal plate, and where it is directly laminated onto a metal plate by roll coating or the like.

The thickness of layer B should be as thick as possible to provide the cosmetic function t, but it is usually 20 to 5 degrees thick.

It is in the μm range.

The transparent thermoplastic resin layer (E layer) must have a visible light transmittance of 80 to 98%, and can be made of polyester, polycarbonate, polyvinyl alcohol, polypropylene, silent FFL, and plasticized vinyl chloride. Resin, polymethylpentene.

Examples include cellulose triacetate and cellulose diacetate, and stabilizers and plasticizers may be added as necessary. This is because if the visible light transmittance is less than 80%, the image clarity cannot be visually perceived, and plastic films with a visible light transmittance of more than 98% are not currently available.

In addition, the E layer is formed in advance by extrusion, calendering, casting, etc., but for the purpose of the present invention, it has a particularly excellent surface smoothness, that is, a finished surface roughness (Rama process) of 5.
A film formed so that the thickness is below pm is used. E
The layer thickness usually ranges from 10 to 250 pm.

The finished surface roughness (Rama machining) is greater than 5 μm (
This is because if the surface is rough, diffuse reflection will occur on the surface, which will easily impair image sharpness.

The resins for the B layer and E layer are not the same as those mentioned above, but are determined by the melting temperature Y of the resin constituting the B layer.
TB ('C), melting temperature Tg of the resin constituting the Ell Bi
('C), the combinations such as 'r, , -'rB≧50 are used.

Why does 'rg-'rB≧50 have to be here?
state

As shown in FIG. 1, a printing ink layer (C layer) and an adhesive layer (D layer) are interposed between the B layer and the E layer. However, the D layer is often omitted when the combination of the B layer and the E layer has a strong affinity for each other.

Note that FIG. 1 is a sectional view of a high-definition laminated metal plate of the invention.

As shown in Fig. 1, the B layer is generally the thickest layer, and the E layer is the next thickest layer.
DM is much thinner than B layer and E layer, and usually has a thickness of 1 to 1
Although the range is from 0 μIn, ] to 20/jlH, the technical concept of the present invention is not necessarily limited to this range.

Here, T, -TB≧50', that is, TE≧Tn +
50, n is 1. A laminated metal plate with high image clarity, which is the object of the present invention! It is almost impossible to obtain it.

Printing ink layer ((Jt) formed on the surface of layer B or layer D
microscopically exists in the form of a discontinuous convex shape.

In addition, the printing ink is high-grade metal powder and inorganic.

Unique pigment! In addition, because the vehicle is generally a thermosetting resin type, the B layer and E
Compared to the thermoplastic resin used for the layer, it has particularly high hardness near the temperature at which it is pressed by a mirror finish roll used in the invention. Therefore, by making the B layer absorb the unevenness of the 0 layer, which is harder than the print-in and E layers, the smoothness of the surface of the E layer can be maintained, and as a result, a surface with high image clarity can be obtained! This is the first completed headline.

Temperature of the laminated metal plate when pressurized with a mirror finish roll (hereinafter sometimes abbreviated as plate temperature) v'l' (C, if T > TH-20, that is, T is the outermost layer If the temperature of E is 20℃ lower than T8, the E layer will not have a smooth finish due to adhesion with the surface of the mirror-finishing roll, and sufficient sharpness will not be obtained. ≦T
, -20 conditions! When satisfied, sufficient image sharpness can be obtained.

- When TB+10, the unevenness of the 0 layer does not fully penetrate into the B layer, and the unevenness appears on the surface of the E layer, so the image clarity is sufficient! Not shown. At this time, the roughness of the metal plate and the unevenness of the adhesive layer (layer A) also appear on the surface of the layer E, so depending on the surface condition of the metal plate and the adhesive layer, the sharpness may be significantly poor!
show. Therefore, sufficient image sharpness can be obtained when T≧TB+10.

Therefore, TB satisfies the conditions TB+10≦T≦T, -20
The effect of the present invention can be obtained only in the relationship between and T8.

Furthermore, since the plate temperature T is not necessarily constant in the width direction and longitudinal direction of the metal strip, it is industrially stable. In order to ensure this, it is desirable that T≧20. That is, T and i must have a width of at least 20'C.

Therefore, (TH-20)-(TB+I O)≧20, i.e.
T, -TB≧50.

This is an important requirement of the present invention.

The continuous or discontinuous printing ink layer (C7) is vinyl-based, acrylic-based, or polyester-based.

Metal powder, inorganic, organic pigments, etc. in vehicles such as urethane! The kneaded ink has a grain of 9 stones and wood grain.

It is formed by printing in an abstract pattern or on the entire surface (so-called solid printing) on the B layer or E layer (generally gravure printing) and then curing it.

Examples of metal sheets include cold-rolled steel sheets, electrogalvanized steel sheets, hot-dipped galvanized steel sheets, and electrolytic chromic acid treated F3JA steel sheets.

An An to A1 alloy plate, a stainless steel plate, a copper plate, a brass plate, or another Cu alloy plate is used.

It is preferable that the surface of the metal plate be smooth, but since minute irregularities are smoothed out during the lamination process, it is sufficient that the surface has a finish that is used for ordinary laminated metal plates, and there are no particular requirements. do not have.

An adhesive (layer A) may be used between the metal plate and the slow thermoplastic resin layer (Blfi). As the resin component constituting the eight metals, known ones are used depending on the resin composition of the B layer. For example, if the B layer is a vinyl chloride resin, an acrylic, epoxy, or polyester resin is used, and if the D layer is a polyolefin resin, an epoxy resin or the like is used.

The printing ink layer (C layer) uses an ink that is adhesive to either or both of the Dooseki 1 thermoplastic resin layer (B layer) and the transparent base thermoplastic resin layer (E layer). Ensure contact force between layer B and E layer, but if the contact is insufficient, 0
Adhesive layer (D layer) between layer and B layer or between layer 0 and El
! In addition, adhesive can be secured.

D layer! The constituent resin components are B layer and E layer! Depending on the constituent resin components, known ones can be used. For example, if the B layer is made of PVC and the E layer is made of polyester such as PET, the DF
- is acrylic or polyester.

Next, a method for manufacturing the first invention (product), which is the second invention, will be described in detail.

Multilayer structure film yk: B layer, which is laminated in advance in the order of B layer/C layer/E layer on a metal plate! Adhesive layer (A layer) as needed on the metal plate side! Laminated by roll or press lamination method through T,>T! ≧TB plate temperature T (however, T
, -TB≧5o) after being pressurized with a mirror finish roll or flat plate.

layer or between the C layer/E layer.

Furthermore, another direction pressure is applied to the B layer and A layer as necessary on the metal plate! After coating and curing with a roll coater, curtain flow coater, etc., the film is laminated in the order of CII/E layers in advance! In this case, if necessary, the adhesive layer (D layer) is formed between the C layer/E layer or between the C layer/B layer, but the adhesive layer (D layer) is laminated by roll or press lamination method, Plate temperature T where TE >'II'≧'rB
(However, T, -'rB≧50) It is manufactured by pressing with a mirror finish roll or flat plate in a deaf state and then cooling it.

[Action and effect of the invention]

The effect of the present invention ('?J%1.2nd invention) is, in short, a transparent hard layer (E layer)! By applying pressure from the surface through the C layer, which is a hard discontinuous layer, the relatively soft B layer is embedded (invaded) into the entire B layer! This is to smooth the surface.

This can be easily understood by comparing FIG. 2, which is a sectional view before pressurization, and FIG. 1, Z, which is a sectional view after pressurization.

In the laminated metal plate of FIG. 1 according to the present invention, visible light incident from each direction on the upper surface is absorbed by the E layer, which has a smooth surface and is transparent! The light passes through and enters the B layer or 0 layer, where its contrast and color tone are faithfully expressed. In this case, the influence of thin Dm can be ignored.

In addition to the process of transmission, refraction, and selective reflection mentioned above, it seems that improving the specular reflectance by smoothing the surface of the surface layer E is more effective in terms of the sharpness of the plate.

In contrast, in the conventional laminated metal plate shown in Figure 2, the E layer is uneven due to the discontinuous 0 layer. Due to the formation, microscopic diffuse reflection occurs on the 7 surface, and the E layer is a film with high visible light transmittance! Even when used, the sharpness of the image is low.

Note that the first invention specifies the high-definition laminate produced according to the second invention by the melting temperature characteristics of the resin waste, and the surface roughness and transparency of the E layer. Production method? This was specifically specified in terms of pressurized plate temperature.

Hereinafter, the present invention will be explained in detail with reference to Examples.

(Example 1) Plasticized PVC resin film with black tone color (plasticizer DO
Contains 15 parts by weight of P, thickness Iooμm)! After printing a stone pattern with pearl-colored ink, a biaxially stretched polyester film (thickness 25 μm, surface roughness Ra max: 3 Pm or less) with a visible light transmittance of 85% was laminated using an all-urethane adhesive. Zn'-CO-MO on which an acrylic adhesive layer has been completely formed in advance on a multi-component film made of
After laminating rolls at 180°C on a composite electrogalvanized steel sheet (thickness Q, 5 m, surface roughness Ra max 2 Opm or less), it was heated to 200°C and pressed with a mirror roll with a glossy chrome plating finish. , immediately (two bottles were cooled down).

The sharpness of the multilayer film laminated on the metal plate was measured using a sharpness gloss meter PGD-4 manufactured by Japan Color Research Institute. degree is 0.2
It showed an extremely superior image sharpness of 0.9.

Further, the obtained laminated metal plate had no practically harmful surface defects such as blisters and dents.

<Example 2> White polypropylene film (thickness: 100 mm)
After printing a stone pattern with metallic-colored ink on the paper (μm), a multilayer structure film made by laminating the same biaxially stretched polyester film as in Example 1 and a urethane-based adhesion agent was preliminarily attached to an epoxy-based adhesive. Composite electrogalvanized steel sheet with agent layer formed (thickness Q, 7 m, surface roughness fJj Ra
max ] 5 Pm Pl lower) 11 After stacking the rolls at 11170° C., while heated to 190° C. 27+], pressure was applied with a mirror-finished roll with a glossy chrome plating finish, and immediately cooled with water.

The sharpness of the resulting laminated metal plate was 0.9, which was extremely excellent, compared to 0.1 for the multilayer film. Furthermore, the obtained laminated metal plate had no practically harmful defects.

(Example 3) A low-density polyethylene film with a cream-colored tone (
After printing a stone pattern with metallic ink on a film (thickness 150 μm), a multilayered film obtained by laminating biaxially stretched polyester films similar to those in Example] using a urethane adhesive was treated with electrolytic chromic acid. Steel plate (thickness 0.32m
, surface roughness Ra max 5 μm or less) after roll lamination at 170°C.

While the temperature was maintained at 170° C., pressure was applied using a mirror-finished roll with a glossy chrome plating finish, and the product was immediately cooled with water.

The obtained laminated metal plate had an excellent image sharpness of 0.9 and no harmful tx surface defects.

(Example 4) Plasticized PVC resin film (plasticizer DO
A polycarbonate film (thickness: 20 μm, surface roughness: Ra
A multilayer film made of N layers of machining (machining 3 μm or less) using a polyester adhesive! , a laminated metal plate was prepared in the same manner as in Example] except that pressure was applied with a mirror roll at 190'C. Obtained.

The obtained laminated metal plate had an excellent image contrast of α9 and no harmful surface defects.

<Example 5> White polypropylene film with blue tint (thickness 150
μrn), solid printing with metallic ink? After that, a multi-layered film consisting of a cellulose triacetate film (thickness 20 μm, surface roughness Ramax 3 μm or less) with a visible light transmittance of 92% is laminated using a vinyl acetate adhesive, and an epoxy adhesive layer is formed in advance. Electrogalvanized steel sheet (thickness Q, 5 rm, surface roughness q Ram
ax 10 Rn or less) 1:] After roll lamination at 75°C, pressure was applied with a mirror roll while heated to 390°C, and immediately cooled with water.

The obtained M-layer metal plate had an excellent image contrast of 0.9 and had no harmful surface defects.

(Example 6): 1% l (> Layered vinyl resin paste sol (polymer DOP35, mixed with appropriate amount of diluent) ￥ Apply acrylic adhesive layer to a thickness of 50 μm using a roll coater. Composite electrogalvanized steel sheet (thickness Q,
5 fl, surface roughness Ra maz 10 Em or less)
After coating and gelatinizing at 180'C, a stone grain pattern was printed in advance with crowbar color ink, and then an acrylic adhesive layer Z
A biaxially stretched polyester film (thickness: 25 μm) with a visible light transmittance of 85% was formed on the printing surface.

There were no surface defects.

<Example 7> Example 6 except that the plasticizer content of the vinyl chloride resin paste sol was 40 parts by weight and the thickness was 100 μm.
Similar to laminated metal plates? Obtained.

The image quality of the obtained laminated metal plate was O19, and there were no harmful surface defects.

<Example 8> A transparent hard thermoplastic resin film has a visible light transmittance of 9
A laminated metal plate was prepared in the same manner as in Example 6, except that it was a 1% polycarbonate film (thickness: 20 μm2, surface roughness Ra max: 3 μm or less)! Obtained.

The resulting laminated metal plate had a sharpness of 0.9 and had no harmful surface defects.

Comparative Example] A laminated metal plate was obtained in the same manner as in Example 1, except that the temperature of pressing with a mirror roll was 270°C.

The image contrast of the obtained laminated metal plate was 0.1 or less.

Comparative Example 2 A laminated metal plate was prepared in the same manner as in Example 1, except that the temperature at which it was pressed with a mirror roll was 170°C. Obtained.

The image contrast of the obtained laminated metal plate was 0.1 or less.

Comparative Example 3> Black and blue medium density polyethylene film (thickness 15
After printing 1 metallic color on 0 μm), polypropylene film with visible light transmittance of 88% Y ethylene-vinyl acetate adhesive! A composite electrogalvanized steel sheet (thickness 0.5III1 surface roughness Ra max l
0, um or less) at 150°C, then 1
Laminated metal plates are made by pressing with a mirror roll at 50℃ and then cooling with water! Obtained.

The image contrast of the obtained laminated metal plate was 0.1 or less.

(Comparative Example 4) Except for using a multilayer structure film in which the plasticized PVC resin film printed with the pearlescent ink used in Example 1 and the silent PVC resin film (thickness soPm) yr laminated with a visible light transmittance of 88% were used. A laminated metal plate was obtained in the same manner as in Example 1.

The image contrast of the obtained laminated metal plate was 0.2.

(Comparative Example 5) The sharpness of the laminated metal plate obtained in the same manner as in [Example] except that it was immediately cooled with water after being laminated with rolls (no pressure was applied with mirror rolls) was 0.I Pl, below. there were.

Above examples and comparative examples! The details are summarized in Table 1.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional laminated metal plate. A layer, D layer...adhesive jφ. B layer: Lta thermoplastic resin layer. C) ω・・・・・・Receipt of printing ink. E layer: keratin thermoplastic resin layer. Figure 1 Figure 2

Claims (6)

[Claims] (1) On a metal plate, an adhesive layer (layer A), a base thermoplastic resin layer (layer B), a continuous or discontinuous printing ink layer (layer C)
layer), adhesive layer (D layer), transparent surface thermoplastic resin layer (
In a high-definition laminated metal plate formed by laminating in the order of layer E), when the melting temperature of the resin forming layer B is T_B (°C) and the melting temperature of the resin forming layer E is T_E (°C), A high-definition laminated metal plate, characterized in that T_E-T_B≧50, the finished surface roughness (Ra max) of the E layer is 5 μm or less, and the visible light transmittance of the E layer is 80 to 98%. (2) The laminated metal plate according to claim 1, wherein the B layer is made of vinyl chloride resin and the E layer is made of polyester resin. (3) On the metal plate, adhesive layer (A layer), basic thermoplastic resin layer (B layer), continuous or discontinuous printing ink layer (C
layer), adhesive layer (D layer), transparent surface thermoplastic resin layer (
In the manufacturing method of a high-definition laminated metal plate in which layers are laminated in the order of layer E), the melting temperature of the resin constituting the B layer is T_B (℃), and the melting temperature of the resin constituting the E layer is T_E (℃). After laminating the layers A, B, C, D, and E on the metal plate, T_B
Laminated metal plate temperature T such that ≦T<T_E (however, T_E-T_
B≧50), a method for producing a high-definition laminated metal sheet, which is characterized in that it is pressed by a finishing roll having a mirror surface at least in part and immediately cooled. (4) The method for manufacturing a laminated metal plate according to claim 3, wherein the B layer is a vinyl chloride resin and the E layer is a polyester resin. (5) The method for manufacturing a laminated metal plate according to claim 4, wherein the vinyl chloride resin of layer B is formed by a sol coating method. (6) On the metal plate where A layer has been painted and cured, B layer and C
5. The method for producing a laminated metal plate according to claims 3 to 4, wherein multilayer resin films are laminated in which a layer, a layer D, and a layer E are laminated in this order in advance.