JP2006007688A - Steel sheet decorative material and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a steel sheet decorative material constituted so as not to cause trouble such that the emboss of a surface becomes shallow and gentle and the adhesion strength between the layers of a decorative sheet is lowered though employing a conventional method for activating an adhesive layer by heat when the decorative sheet is laminated on a steel sheet base material, using the decorative sheet containing a non-vinyl chloride type thermoplastic resin as a main material, and the steel sheet decorative material. <P>SOLUTION: The decorative sheet 5 is laminated on the steel sheet base material 2 through the adhesive layer 13 activated by heating to form a decorative sheet laminate and, after this decorative sheet laminate is cooled, a transparent polyolefin sheet 10 is further laminated on the upper decorative sheet of the laminate by extrusion lamination using a T-die. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is obtained by laminating a decorative sheet mainly made of a non-polyvinyl chloride thermoplastic resin, which is mainly used for surface decorations such as entrance doors and curtain rails of buildings, on a steel plate substrate. The present invention relates to a method for manufacturing a steel sheet decorative material and a steel sheet decorative material.

  Conventionally, for surface decoration of building entrance doors and steel sheet material exterior members, a decorative sheet directly coated with a decorative pattern on a steel sheet member, or a decorative sheet with printed and uneven embossing on a polyvinyl chloride sheet Has been used, such as a method of bonding to a steel plate substrate via an adhesive, but it is difficult to express a design with unevenness by applying a decorative pattern by painting, and a polyvinyl chloride decorative sheet was used. The addition of decorative patterns tends to be avoided from the recent increase in environmental awareness.

  In recent years, non-polyvinyl chloride decorative sheets mainly made of polyolefin resin or acrylic resin, which have the same design as polyvinyl chloride decorative sheets and have a low environmental impact, have attracted attention. Of these, decorative sheets made mainly of polyolefin, in particular, are at the same level or higher compared to polyvinyl chloride decorative sheets in terms of physical properties and production costs, and are widely used as an alternative to polyvinyl chloride decorative sheets. Being started.

  However, when the decorative sheet is used for the surface decoration of the entrance door or the steel plate base material exterior member, when the decorative sheet is bonded to the steel plate base material, the adhesive applied to the steel plate base material is about 150 to 250 ° C. Since a method of laminating a decorative sheet after being activated by heating is generally used, when a polyolefin-based decorative sheet is applied in such a manufacturing method, makeup is caused by the influence of heat when the adhesive is heated. There is a problem that the embossment of the unevenness on the surface of the sheet becomes shallow and gentle, and the design feeling is impaired.

  Further, in terms of physical properties, the adhesion strength between the layers of the decorative sheet is lowered due to the heat load and the accompanying resin deterioration, and the long-term weatherability is also deteriorated.

  The present invention has been made in view of the drawbacks of the related art, and uses a decorative sheet mainly made of a non-vinyl chloride thermoplastic resin, and a thermal adhesive when the decorative sheet is laminated on a steel plate substrate. While adopting the conventional method of activating the layer, the embossing of the surface is shallow and gentle, and the adhesion strength between the layers of the decorative sheet is reduced, so as not to cause problems. An object is to provide a method for manufacturing a steel sheet decorative material and a steel sheet decorative material.

  In order to solve the above-mentioned problems, the invention according to claim 1 is a method for producing a steel sheet decorative material comprising at least a decorative sheet made of a non-vinyl chloride thermoplastic resin as a main material on a steel sheet substrate. Then, after laminating through an adhesive layer activated by heating and laminating a decorative sheet on a steel plate substrate to produce a decorative sheet laminate, the decorative sheet laminate is cooled and then A method for producing a steel sheet decorative material, characterized in that a transparent polyolefin sheet is further bonded onto an upper decorative sheet by extrusion lamination using a T-die.

The invention according to claim 2 is the method for manufacturing a steel sheet decorative material according to claim 1, wherein the transparent polyolefin sheet is bonded to the decorative sheet after embossing the transparent polyolefin sheet. Features.

  Furthermore, the invention described in claim 3 uses a homopolypropylene having a pentad fraction of 75% or less as the resin constituting the transparent polyolefin sheet in the method for manufacturing a steel sheet decorative material according to claim 1 or 2. It is characterized by.

  Furthermore, the invention according to claim 4 is the method for producing a steel sheet decorative material according to any one of claims 1 to 3, wherein the bonding of the transparent polyolefin sheet is modified with an unsaturated carboxylic acid or an anhydride thereof. It is formed through an anchor agent layer made of an adhesive polyolefin.

  Furthermore, the invention according to claim 5 is a steel sheet decorative material in which a decorative sheet mainly made of a non-vinyl chloride thermoplastic resin is bonded to a steel sheet base material, the decorative sheet being heated by heat. It is provided on the steel plate substrate via the activated adhesive layer and laminated on the decorative sheet by extrusion lamination using a T die after the heat associated with the activation of the lower adhesive layer is cooled. The steel sheet decorative material is provided with a transparent polyolefin sheet.

  Furthermore, the invention according to claim 6 is the steel sheet decorative material according to claim 5, wherein the transparent polyolefin sheet is embossed before being laminated on the decorative sheet. To do.

  Furthermore, the invention according to claim 7 is the steel sheet decorative material according to claim 5 or 6, wherein the resin constituting the transparent polyolefin sheet is a homopolypropylene having a pentad fraction of 75% or less. .

  Furthermore, the invention according to claim 8 is the steel sheet decorative material according to any of claims 5 to 7, wherein the transparent polyolefin sheet is an anchor made of an adhesive polyolefin modified with an unsaturated carboxylic acid or its anhydride. It is provided through an agent layer.

  The method for producing a steel sheet decorative material and the steel sheet decorative material according to the present invention uses a decorative sheet mainly composed of a non-vinyl chloride thermoplastic resin, and a thermal adhesive when the decorative sheet is laminated on the steel sheet substrate. While adopting the conventional method of activating the layer, there is no problem that the embossing of the surface is shallow and gentle, and the adhesion strength between the layers of the decorative sheet is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing an outline of a method for manufacturing a steel sheet decorative material according to the present invention. Moreover, FIG. 2 is explanatory drawing which shows the structure of the outline of the steel plate decorative material which concerns on this invention.

  In the production of the steel sheet decorative material, as shown in FIG. 1, first, a steel sheet base material 2 serving as a substrate of the steel sheet decorative material is sent out from the unwinding part 1 to the adhesive coating part 3. The steel sheet substrate 2 that has been fed out is coated with an adhesive on the surface on which the decorative sheet is bonded, and an adhesive layer 13 is formed.

The steel plate substrate 2 on which the adhesive layer 13 is formed is further sent to the heating oven 4 where it is heated to about 150 to 250 ° C., and the adhesive constituting the adhesive layer 13 is activated, and then the printed pattern. The non-polyvinyl chloride decorative sheet 5 subjected to is bonded.

  The adhesive application method in the adhesive application process is not particularly limited, and an appropriate method is selected from various application methods such as a die coating method using a T-die, a roll coating method, and a gravure coating method using a gravure roll. Can be used.

  In this way, when the decorative sheet 5 is bonded onto the steel plate substrate 2 via the adhesive layer 13, the decorative sheet laminate composed of three layers of these steel plate substrate 2 / adhesive layer 13 / decorative sheet 5 is obtained. After the cooling water 6 kept at a constant temperature is instantaneously cooled to about 30 to 50 ° C. and further sent to the first drying furnace 7 to remove unnecessary cooling water, the anchor agent is applied. It is sent to the engineering department 8.

  The anchor agent coating unit 8 applies the anchor agent to the decorative sheet surface side of the three-layer decorative sheet laminate that has been sent. When the anchor agent is applied, it is sent to the second drying furnace 9 where it is heated to about 40 to 60 ° C. to evaporate the solvent component in the anchor agent, and the anchor agent layer 18 is formed. And the transparent polyolefin sheet | seat 11 which gave the uneven | corrugated embossing on the anchor agent layer 18 is laminated by the extrusion lamination which uses the T-die 10, and the steel plate decorative board of a structure as shown in FIG. 2 is obtained.

  The polyolefin constituting the dry-laminated transparent polyolefin sheet does not have a very high melting point. Among them, even in the case of homo-type polypropylene that falls into the category with the highest melting point, the melting point is about 160 to 170 ° C., and ASTM D1525 The Vicat softening point defined by is approximately 30 to 100 ° C. lower than that. Therefore, when trying to manufacture a steel sheet decorative material by laminating a homo-type transparent polypropylene sheet that has been embossed on the decorative sheet after bonding the decorative sheet to the steel sheet substrate through an adhesive layer, If the transparent polypropylene sheet is pasted while maintaining the high temperature state for activating the adhesive layer, the unevenness formed on the transparent polypropylene sheet becomes shallow and gentle due to the influence of heat. The design feeling is impaired.

  In addition, when such a lamination is performed, a heat load is applied to the laminated portion of the decorative sheet with the printed pattern and the transparent polyolefin sheet, which causes a decrease in interlayer strength, resulting in deterioration of the resin and film from the interlayer. The weathering performance will be inferior due to floating.

  On the other hand, in the production method of the present invention, the adhesive layer on the steel plate substrate is activated by heating and then the decorative sheet with the printed pattern is firmly bonded, and then the adhesive layer is activated. In order to bond the transparent polyolefin sheet by extruding lamination using a T-die after the decorative sheet laminate having been heated to a high temperature is cooled, the laminated sheet is, for example, a transparent polyolefin sheet having a low melting point that has been embossed. However, it can be laminated without the embossed surface being shallow and gentle. Therefore, the design feeling due to the unevenness imparted to the transparent polyolefin sheet is not lost at all when it becomes a steel sheet decorative board. Moreover, since the heat load is not applied to the laminated portion of the decorative sheet and the transparent polyolefin sheet on which the printed pattern is applied, the interlayer strength does not decrease, and the weather resistance can be prevented from decreasing.

Furthermore, the production method of the present invention also has an advantage that the degree of freedom in selecting the transparent polyolefin constituting the transparent polyolefin sheet is increased. That is, in the conventional manufacturing method described above, since the transparent polyolefin sheet having an embossed pattern is affected by heat, it is necessary to select a polyolefin having a melting point and a Vicat softening point as high as possible. However, on the other hand, since the decorative sheet is subjected to bending when it is processed into an entrance door, etc., it is necessary to prevent the transparent polyolefin sheet on the surface from cracking or whitening during bending. It was also necessary to select a resin with a low rate.

  The above two physical properties, that is, the olefin resin having a high melting point and Vicat softening point and a low flexural modulus, are almost limited to homopolypropylene having a low pentad fraction or random polypropylene having a low ethylene content. . For example, in systems in which rubber components such as ethylene / propylene / rubber, styrene / butadiene / rubber are added to polypropylene, and systems using polyethylene, the flexural modulus can be lowered, but at the same time the melting point and Vicat softening point Therefore, the transparent polyolefin used in the conventional production method as described above is not suitable.

  On the other hand, in the production method of the present invention, no heat load is applied at the time of laminating the transparent polyolefin sheet, so that the transparent polyolefin constituting it has a low melting point and Vicat softening point, or a homotype polypropylene or ethylene having a low pentad fraction. It is possible to use random polypropylene with a low content, and it is also possible to use a system in which rubber components such as ethylene, propylene, rubber, styrene, butadiene, rubber are added to the above polypropylene, or polyethylene resin become. As a homo-type polypropylene having a low pentad fraction, it is preferable to use one having a pentad fraction of 75% or less because cracking and whitening of the resin during bending can be suppressed.

  In addition, embossing to the transparent polyolefin sheet is performed by applying the heated embossing roll to the transparent polyolefin sheet before or after laminating the transparent polyolefin sheet on the decorative sheet laminate obtained by laminating the decorative sheet on the steel plate substrate. The method of pressing and giving is common, but when a transparent polyolefin sheet is produced by forming an extruded sheet with a T die, it is embossed in advance as a cooling roll for cooling and solidifying the resin melted and discharged from the T die. If a pattern is used and embossing is performed simultaneously with sheet molding, the two steps can be performed simultaneously, which is efficient.

  For steel sheet decorative materials with the above configuration, the design feeling is further improved by giving a predetermined luster, and for the purpose of imparting wear resistance, chemical resistance, scratch resistance, etc. A surface protective layer may be provided on the surface layer portion on the transparent polyolefin sheet side. The material, thickness, and formation method of the surface protective layer are not particularly limited as long as sufficient adhesion with the transparent polyolefin sheet can be ensured. For example, using a urethane-based resin, by a gravure coating method What is necessary is just to apply and provide so that thickness may become about 4-12 micrometers. Lamination of the surface protective layer on the transparent polyolefin sheet is more subtle as a steel sheet decorative plate by adjusting the gloss of the surface protective layer when laminating the transparent polyolefin resin on the steel sheet substrate to which the decorative sheet is bonded. Convenient because it can adjust the design feeling. However, a surface protective layer may be previously laminated on the transparent polyolefin sheet before lamination. However, if the surface protective layer is laminated before embossing, problems such as cracks in the surface protective layer and changes in luster occur due to heat during embossing. Unless there are special restrictions, it is better to do this before embossing.

Since the weather resistance of the steel sheet decorative material thus obtained is generally required, it is preferable to add an ultraviolet absorber, a light stabilizer or the like to the transparent polyolefin sheet or the surface protective layer described above. As the ultraviolet absorber, there is no particular limitation on its components and addition amount as long as it has a desired ultraviolet absorption effect and does not greatly affect the properties other than the weather resistance of the decorative sheet. 2- [2-hydroxy-3,5-bis (dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3-tert-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2 Benzotriazole ultraviolet absorbers such as-(3,5-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole and 2- (2-hydroxy-5-t-octylphenyl) -benzotriazole; Benzophenone ultraviolet absorbers such as hydroxy-4-methoxybenzophenone and 2,2′-dihydroxy-4-methoxybenzophenone, Triazine ultraviolet absorbers such as 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol, inorganic ultraviolet absorbers such as cerium oxide and titanium oxide An agent etc. can be mentioned, Among these, it is possible to add 1 type or 1 type or more in arbitrary combinations.

  Further, if the light stabilizer is within a range where the desired ultraviolet ray absorbing effect is exhibited and does not significantly affect the properties other than the weather resistance of the decorative sheet, particularly the component, the transparent polyolefin layer, and the surface protective layer are applied. There is no limit to the amount added. Specifically, dimethyl succinate 1- (2-hydroxyethyl) -4-hydroxy-2,2,6,6-tetramethylpiperidine, poly [{6- (1,1,3,3-tetramethyl Butyl) amino-1,3,5-triazine-2,4diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {(2,2,6,6-tetramethyl) -4-piperidyl) imino}], N, N′bis (3-aminopropyl) ethylenediamine · 2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4piperidyl) Amino] -6-chloro-1,3,5-triazine, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, 2- (3,5-di-t-butyl-4-hydroxy Benzyl) -2-n-butylmalonate (1,2,2,6,6-pentamethyl-4-piperidyl), tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) 1,2,3,4-butanetetracarboxylate, etc. Hindered amine light stabilizers, benzoate light stabilizers such as 2,4-di-t-butylphenyl-3,5-di-t-butyl-4-hydroxybenzoate, bis- (2,2,6,6) Examples include aminoether type light stabilizers such as -tetramethyl-1- (octyloxy) -4-piperidinyl) ester, and one or more of these can be selected and used in combination. It is.

  In addition, you may add a heat stabilizer, a flame retardant, an antiblocking agent, etc. as needed. As the heat stabilizer, pentaerythrityltetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl)]-propionate, 2,4-bis- (n-octylthio) -6- (4- Hydroxy-3,5-di-t-butylanilino) -1,3,5-triazine, octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl -2,4,6-tris (3,5-t-butyl-4-hydroxybenzyl) benzene, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanur Hindered phenol antioxidants such as acid, 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 2,2′-methylenebis (4-methyl-6-tert-butylphenol) Phenolic antioxidants such as glycerin), phosphorus antioxidants typified by tris (2,4-di-t-butylphenyl) phosphite, and the like. The above may be selected and used in appropriate combination.

  Examples of the flame retardant include inorganic compounds such as aluminum hydroxide, magnesium hydroxide, calcium carbonate, and magnesium carbonate, and phosphate ester flame retardants, but there are no particular restrictions on the type of the flame retardant. However, in consideration of the environment, it is desirable to use halogen-based flame retardants, and it is desirable to use alternatives with equivalent performance.

  Furthermore, as the anti-blocking agent, there are inorganic anti-blocking agents such as aluminum silicate, silicon oxide, hydrotalcite and calcium carbonate, organic anti-blocking agents such as fatty acid amide, etc., and there is one of them. May be selected from two or more and used in appropriate combination.

In addition, if necessary, a primer layer may be appropriately provided on the side of the steel plate substrate on which the non-polyvinyl chloride decorative sheet is laminated for the purpose of improving the adhesion strength with the steel plate substrate. This primer layer is particularly limited in its constituent materials as long as sufficient adhesion strength with the steel plate base material is obtained and no sheet floating or the like occurs between the decorative sheet and the steel plate base material during lamination. Although it is not a thing, generally a polyurethane-type primer layer is used suitably. Hereinafter, the present invention will be described in more detail with reference to examples.

  First, on a random polypropylene sheet containing an inorganic pigment such as titanium oxide and having a concealing effect, a wooden pattern was applied by a gravure printing method to obtain a colored polypropylene sheet (decorative sheet) having a thickness of 70 μm.

  Next, a two-part curable adhesive is applied to a steel plate substrate having a thickness of 500 μm to a thickness of about 10 μm, and further heated in an oven at 200 ° C. for 2 minutes to activate the adhesive, and then a wooden pattern is formed. The applied colored polypropylene sheet (decorative sheet) was bonded to obtain a decorative sheet laminate. And after cooling the high-temperature decorative sheet laminate with cooling water having a water temperature of about 20 ° C., the excess cooling water is removed in a drying furnace, and then the urethane anchor agent is placed on the decorative sheet of the decorative sheet laminate. Was applied in a thickness of about 1 μm, and an anchor agent layer was provided by removing the solvent component in a drying oven at 50 ° C.

  Thereafter, 0.5 parts by weight of a triazine ultraviolet absorber, 0.5 parts by weight of a hindered amine light stabilizer, and 0.2 parts by weight of a phenolic antioxidant were added, respectively. A transparent homopolypropylene having a rate of 70% was laminated on the anchor agent layer by extruding and laminating a transparent polypropylene sheet having a thickness of 90 μm by using a T-die or by extrusion lamination.

  Finally, after the corona treatment is applied to the surface of the transparent polypropylene sheet provided in the above step, 3.0 parts by weight of triazine-based UV absorber and 3% of hindered amine-based light stabilizer are added in the urethane resin. The resin composition added with 0.0 part by weight was laminated as a surface protective layer with a thickness of 9 μm to obtain a steel sheet decorative material of Example 1.

  Example 1 except that a transparent homopolypropylene sheet was embossed by using a cooling roll with an embossed pattern when it was extruded and laminated by extrusion lamination using a T die using a transparent homopolypropylene. The steel sheet decorative board of Example 2 was obtained by the same manufacturing method.

  Production method similar to Example 2 except that an adhesive polyolefin layer (anchor agent layer) modified with carboxylic acid is provided between a transparent homopolypropylene sheet and a colored polypropylene sheet (decorative sheet) by a coextrusion laminating method Thus, a steel sheet decorative board of Example 3 was obtained.

  A transparent homopolypropylene sheet is laminated on a colored polypropylene sheet with a printed pattern by a coextrusion laminating method using a cooling roll with an embossed pattern, and a triazine ultraviolet ray is applied to the outermost layer on the transparent homopolypropylene sheet side. A surface protective layer mainly composed of urethane resin to which 3.0 parts by weight of an absorbent and 3.0 parts by weight of a hindered amine light stabilizer were added was laminated with a thickness of 9 μm to prepare a decorative sheet body.

On the other hand, a two-component curable adhesive was applied to the steel plate substrate and heated in an oven at 200 ° C. for 2 minutes to provide an adhesive layer having a thickness of about 10 μm. Then, after pasting the decorative sheet body prepared in the above process, immediately cool it with water at a water temperature of about 20 ° C., and remove unnecessary cooling water when used in a drying furnace for cooling. A steel sheet decorative material of Example 4 for was obtained.

  When a transparent homopolypropylene sheet is extruded and laminated by the T-die extrusion method, an adhesive polyolefin layer (anchor agent layer) modified with an anhydride of carboxylic acid is placed between the transparent homopolypropylene sheet and the colored polypropylene sheet (decorative sheet). A steel sheet decorative board of Example 5 for comparison was obtained by the same production method as in Comparative Example 4 except that it was provided by the coextrusion laminating method.

As a transparent homopolypropylene, a high crystalline transparent homopolypropylene resin having a pentad fraction of 97% or more was used instead of the transparent homopolypropylene resin having a pentad fraction of 70%. Thus, a steel sheet decorative board of Example 6 was obtained.
<Performance comparison>
The depth of the embossed deepest part was measured with respect to the embossed pattern-shaped decorative sheet before and after bonding to the steel plate base material in each of the above examples, and the ratio of the depths was obtained as the emboss retention rate. The obtained emboss retention is shown in Table 1.

  In addition, as a physical property test, the obtained steel sheet decorative material was subjected to an accelerated weathering test using a sunshine weather meter, a pencil scratch test defined by JIS K5400, and a bending portion when a 1R bending test was performed in a 5 ° C environment. Appearance evaluation was performed. The results are shown in Table 1.

表１から明らかなように、本発明の鋼板化粧材の製造方法によって得られる鋼板化粧材は、従来の製造方法によって得られるものと較べ、サンシャインウェザーメーターでの外観変化が発生するまでの時間が１５００時間程度延び、耐候性能の向上効果が確認された。また、エンボス保持率も１００％であるため、エンボス加工時に賦型された形状が、鋼板化粧材になった後も保持されていた。さらに、透明ポリオレフィンシートに予め賦型されているエンボス形状が熱により変化することが無く、耐傷性能が優れたものであった。

As is apparent from Table 1, the steel sheet decorative material obtained by the method for manufacturing a steel sheet decorative material of the present invention has a longer time until appearance change occurs in the sunshine weather meter than that obtained by the conventional manufacturing method. It extended for about 1500 hours, and the improvement effect of weather resistance performance was confirmed. Moreover, since the embossing retention rate is also 100%, the shape formed at the time of embossing was retained even after it became a steel sheet decorative material. Furthermore, the embossed shape previously formed on the transparent polyolefin sheet was not changed by heat, and the scratch resistance was excellent.

It is explanatory drawing which shows the outline of the manufacturing method of the steel plate decorative material of this invention. It is explanatory drawing which shows the schematic structure of the steel plate decorative material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Unwinding part 2 ... Steel plate base material 3 ... Adhesive coating part 4 ... Heating oven 5 ... Non-polyvinyl chloride type | system | group decorative sheet 6 which gave the printing pattern ... Cooling water 7 ... First drying furnace 8 ... Anchor agent Coating unit 9 ... second drying furnace 10 ... transparent polyolefin sheet 11 ... T die 13 ... adhesive layer 18 ... anchor agent layer

Claims (8)

  A method for producing a steel sheet decorative material comprising at least a decorative sheet made of a non-vinyl chloride thermoplastic resin as a main material on a steel sheet substrate, wherein the steel sheet is formed through an adhesive layer activated by heating. A decorative sheet laminate is prepared by laminating a decorative sheet on a substrate, and then the decorative sheet laminate is cooled, and then a transparent polyolefin sheet is further bonded to the upper decorative sheet by extrusion lamination using a T-die. The manufacturing method of the steel plate decorative material characterized by the above-mentioned.   The method for producing a steel sheet decorative material according to claim 1, wherein the bonding of the transparent polyolefin sheet on the decorative sheet is performed after embossing the transparent polyolefin sheet.   The method for producing a steel sheet decorative material according to claim 1 or 2, wherein homopolypropylene having a pentad fraction of 75% or less is used as a resin constituting the transparent polyolefin sheet.   The steel sheet according to any one of claims 1 to 3, wherein the bonding of the transparent polyolefin sheet is performed through an anchor agent layer made of an adhesive polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof. A method for producing a cosmetic material.   A steel sheet decorative material comprising at least a decorative sheet made of a non-vinyl chloride thermoplastic resin as a main material on a steel sheet substrate, wherein the decorative sheet is a steel sheet substrate through a heat-activated adhesive layer. In addition to being provided on the decorative sheet, a transparent polyolefin sheet laminated by extrusion lamination using a T-die after the heat associated with the activation of the lower adhesive layer is cooled is provided on the decorative sheet. Features steel sheet decorative material.   6. The steel sheet decorative material according to claim 5, wherein the transparent polyolefin sheet is embossed before being laminated on the decorative sheet.   The steel sheet decorative material according to claim 5 or 6, wherein the resin constituting the transparent polyolefin sheet is homopolypropylene having a pentad fraction of 75% or less.   The steel sheet decorative material according to any one of claims 5 to 7, wherein the transparent polyolefin sheet is provided via an anchor agent layer made of an adhesive polyolefin modified with an unsaturated carboxylic acid or an anhydride thereof. .

Images