JP4530746B2 - Manufacturing method and manufacturing apparatus for resin-coated plated steel sheet having embossed pattern - Google Patents

Description

  The present invention relates to a method and apparatus for producing a resin-coated plated steel sheet having an embossed pattern on the surface.

  Resin-coated steel sheets with an embossed pattern in which an embossed pattern such as a grain pattern is coated on the surface of the resin film are used as interior materials such as exterior materials for home appliances and wallboards for buildings. It has been. As resin-coated steel sheets having an embossed pattern, for example, polyethylene-based resin-coated embossed decorative steel sheets (for example, see Patent Document 1) and polyolefin-based resin-coated embossed decorative steel sheets (for example, see Patent Document 2) have been proposed.

  The polyethylene-based resin-coated embossed decorative steel sheet described in Patent Document 1 is obtained by applying an adhesive to a chromate-treated Zn-plated steel sheet, heating to 200 ° C. to laminate a polyethylene-based resin film, and then heating to 150 ° C. A resin-coated embossed decorative steel sheet is formed by pressure bonding with an embossing roll. The polyolefin resin-coated embossed decorative steel sheet described in Patent Document 2 is applied to a Zn-plated steel sheet or Zn alloy-plated steel sheet that has been subjected to a surface treatment such as chromate treatment, and then applied with an adhesive and heated to 220 ° C. A polyethylene-based resin film is laminated, then heated to 130 to 140 ° C. and pressure-bonded with an embossing roll to obtain a resin-coated embossed decorative steel sheet.

  Thus, when providing an embossed pattern on a resin-coated plated steel sheet coated with a resin film, in order to obtain a clear embossed pattern, the resin-coated plated steel sheet is heated to a temperature suitable for embossing the resin film. There is a need to. Moreover, also when coat | covering a resin film to a plated steel plate, it is necessary to heat a plated steel plate to the temperature from which sufficient adhesive strength of a plated steel plate and a resin film is acquired.

  In the resin-coated plated steel sheet having these embossed patterns, the plated steel sheet and the resin film are often laminated and bonded via an adhesive so that sufficient adhesive strength between the plated steel sheet and the resin film can be obtained. The adhesive needs to be heated and cured after application, and is previously applied to the plated steel plate and heat cured before the resin film is laminated and coated on the plated steel plate. In the resin film coating process and embossing process, the steel sheet coated with adhesive is heated to a temperature suitable for pressure welding of the resin film and a temperature suitable for embossing, but high-speed heating is required to increase production efficiency. In addition, it is necessary to heat the adhesive applied to the plated steel sheet in a non-contact manner so that the adhesive is softened by heating and does not transfer due to contact with various rolls such as a deflector roll. Therefore, the induction heating method is used for heating the plated steel sheet in the resin film coating step and the embossing step.

  However, a plated steel sheet such as a Zn-plated steel sheet on which a resin film is laminated and bonded has a large variation in the plating thickness in the width direction, and the plate surface cannot be heated to a uniform temperature when induction heating is performed. For example, in a Zn-plated steel plate in which Zn is plated on both sides with a nominal thickness of 33.6 μm, the actual plating thickness varies from 20.1 to 33.6 μm, and the resin film is bonded from room temperature (30 ° C.). When heated to 230 ° C, which is the temperature or embossing temperature, the temperature variation reaches 17.5 ° C, and the adhesive strength between the Zn-plated steel sheet and the resin film becomes non-uniform, so that sufficient adhesive strength as a whole cannot be obtained. In addition, a portion where a clear embossed pattern is not formed is generated.

Prior art document information relating to the present application includes the following.
Japanese Unexamined Patent Publication No. 07-011717 JP 07-290642 A

  An object of this invention is to provide the manufacturing method and manufacturing apparatus of the resin coating plating steel plate which is excellent in the adhesiveness of a plating steel plate and a resin film, and has a clear embossing pattern on the resin surface.

The method for producing a resin-coated plated steel sheet having an embossed pattern according to the present invention, which solves the above problems,
Heat the plated steel sheet to the bonding temperature of the resin film using the first heating means,
Next, a resin film is brought into contact with the steel plate,
Using a pair of adhesive rolls, sandwiched and pressed into a resin-coated plated steel sheet,
Continue to heat to the embossing temperature of the resin film using the second heating means,
At least one side is embossed with a pair of embossed rolls engraved with an embossed pattern to emboss the resin film surface.
In the method for producing a resin-coated plated steel sheet having an embossed pattern,
Before or after heating the plated steel sheet using the first heating means,
Using a partial heating means consisting of an end heating means for heating both ends of the plated steel sheet and an internal heating means for heating the inside of the plated steel sheet in the width direction, the plated steel sheet is heated by locally changing the heating temperature. ,
When making the temperature distribution in the width direction of the plated steel sheet uniform,
The internal heating means are arranged in two rows in a staggered manner in the width direction of the plated steel sheet (Claim 1).
In the manufacturing method of claim 1, the end heating means 3a and the internal heating means 3b are controlled so that the temperature difference in the plate width direction is 6 ° C. or less (claim 2).
The manufacturing method according to claim 1 or 2, wherein an induction heating device is used as each of the end heating means and the plurality of internal heating means, and the first heating means and the second heating means of the partial heating means. (Claim 3).
In the manufacturing method according to any one of claims 1 to 3, a plated steel sheet obtained by previously applying an adhesive to the surface is used (claim 4).

Moreover, the manufacturing apparatus of the resin-coated plated steel sheet having the embossed pattern of the present invention is as follows.
A first heating means for heating the plated steel sheet to the adhesion temperature of the resin film;
A resin film supply means for supplying the resin film to the plated steel sheet;
A pair of pressure-contacting rolls in which a resin film is in contact with and sandwiched between the plated steel plates and pressed into a resin-coated plated steel plate;
A second heating means for heating the resin-coated plated steel sheet to the embossing temperature of the resin film;
At least one of embossing the resin film surface with the resin-coated plated steel sheet sandwiched between it consists of a pair of embossed rolls engraved with an embossed pattern,
In the production equipment for resin-coated plated steel sheets with embossed patterns,
Before or after heating the plated steel sheet using the first heating means,
In order to make the temperature distribution in the width direction of the plated steel sheet uniform by heating the plated steel sheet by locally changing the heating temperature,
A partial heating means comprising an end heating means for heating both ends of the plated steel sheet and an internal heating means for heating the inside in the width direction of the plated steel sheet;
The internal heating means are arranged in two rows in a staggered manner in the width direction of the plated steel sheet (Claim 5).
In the manufacturing apparatus according to claim 5, the end heating means 3a and the internal heating means 3b are controlled so that the temperature difference in the plate width direction is 6 ° C. or less (claim 6).
The manufacturing apparatus according to claim 5 or 6, wherein the end heating means and the plurality of internal heating means, and the first heating means and the second heating means of the partial heating means are induction heating devices ( Claim 7).

  In the present invention, when the plated steel sheet is heat-bonded by induction heating of the plated steel sheet, and subsequently the resin-coated steel sheet is induction-heated and embossed to form an embossed pattern on the resin surface, the plated steel sheet is Before heating for thermal bonding, which heat-bonds the resin film, pre-heating the pre-heating means by using the pre-heating means to change the heating temperature locally in advance to the part that becomes low temperature when the resin film is heat-bonded By doing so, the non-uniformity of the heating temperature for thermal bonding by induction heating based on the variation in plating thickness is lost, and excellent adhesion between the plated steel sheet and the resin film is obtained, and the resin surface is clear. An embossed pattern can be formed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing an example of an apparatus for producing a resin-coated plated steel sheet having an embossed pattern according to the present invention. FIG. 2 is a schematic view showing another example of the apparatus for producing a resin-coated plated steel sheet having an embossed pattern according to the present invention. 3 is a side view showing an outline of the partial heating unit of the manufacturing apparatus shown in FIG. 1 or FIG. 2, and FIG. 4 is a plan view showing the outline of the partial heating unit shown in FIG. In the apparatus 20 for producing a resin-coated plated steel sheet having an embossed pattern, the plated steel sheet 10 is unwound from the unwinding means 1 such as an uncoiler and is subjected to a course changing means such as a deflector roll 9 and then a resin film lamination coating process, Proceed to the embossing process. In the resin film laminating and coating step, the plated steel sheet 10 is heated by the first heating means 4, but the plated steel sheet 10 varies such that the plating thickness is thicker at the center. Only by heating at, the temperature in the plate width direction of the plated steel sheet becomes non-uniform, and uniform adhesion of the resin film after heat bonding to the plated steel sheet cannot be obtained. Therefore, as a pre-process of the resin film lamination coating step, the partial heating means 3 is provided before the plated steel sheet 10 is heated by the first heating means 4 (FIG. 1) or after the heating (FIG. 2). The part which becomes low temperature at the time of resin film thermal bonding is locally heated so that the temperature in the plate width direction of the plated steel sheet immediately before contacting the resin film is made uniform. In FIGS. 1 and 2, the arrow between the deflector rolls 9 indicates the course of the plated steel sheet.

  The partial heating unit 3 includes an end heating unit 3 a that heats both ends of the plated steel plate 10 and a plurality of internal heating units 3 b that heat the inside of the plated steel plate 10 in the width direction. 3 and FIG. 4, the internal heating means 3b are arranged in a row consisting of the internal heating means 3b1 in the width direction of the plated steel sheet 10, and as two rows arranged in a row consisting of the internal heating means 3b2, The example arrange | positioned in zigzag form is shown. The end heating means 3a is provided so as to be movable in the width direction according to the width of the plated steel sheet to be used. Each of the internal heating means 3b1 and the internal heating means 3b2 is selectively operated as necessary so that the temperature in the plate width direction becomes uniform before or after heating by the first heating means 4. It can be heated locally. The local heating by the partial heating means 3 is performed by disposing a plate temperature measuring means 11 such as a radiation thermometer immediately before the resin film is brought into contact with the heated plated steel sheet 10, The temperature of the low temperature part is specified, and the end heating means 3a and the internal heating means 3b are controlled so that the temperature difference in the plate width direction is 6 ° C. or less based on the result. Although FIG. 1 and FIG. 2 show the case where heating is performed by the internal heating unit 3b after heating by the end heating unit 3a, the heating may be performed by the end heating unit 3a after being heated by the internal heating unit 3b. 1 and 2 show the case where the internal heating means 3b heats the lower surface side of the plated steel sheet 10, the upper surface side of the plated steel sheet 10 may be heated, or the internal heating means 3b1 may be heated upward. Any one of the lower surfaces may be heated, and the opposite surface may be heated by the row of the internal heating means 3b2.

  As for the heating temperature, in order to uniformize the non-uniform heating in the plate width direction due to the variation in the plating thickness of the plated steel plate 10, only the non-uniform portion that is lower than the predetermined temperature is locally heated. However, it is preferable to heat by using an induction heating method capable of heating an arbitrary range with high accuracy so that the smallest possible range can be heated in accordance with variations in plating thickness.

  In this way, before heating to the first heating means 4 or after being heated by the first heating means 4 in order to heat to the temperature necessary for the lamination coating of the resin film (adhesion temperature of the resin film) In the plated steel sheet 10 that has been locally heated by the partial heating means 3, the portion that is low in temperature when the resin film is thermally bonded is locally heated in advance by the partial heating means 3. It becomes uniform. When the resin film is laminated and coated, the plated steel sheet 10 is heated to a temperature equal to or higher than the softening temperature of the adhesive. Therefore, the first heating means 4 is an induction heating method capable of rapid heating without contact with the plated steel sheet 10. It is preferable to heat using. As the heating temperature (adhesion temperature of the resin film), the resin film is heated to a temperature range from the glass transition temperature of the resin film to the melting point of the resin film + 50 ° C. or less depending on the presence or absence of the oriented crystallization state. In this way, the plated steel sheet 10 heated by the first heating means 4 and the partial heating means 3 is unwound from the resin film supply means 5 such as a film uncoiler and is brought into contact with the plated steel sheet 10 to at least one pair. The pressure contact roll 6 is used to press and press. Although FIG. 1 shows the case where a resin film is laminated and coated on one side of the plated steel sheet 10, a resin film supply means is also provided on the other side of the plated steel sheet 10, and the resin film is laminated and coated on both sides of the plated steel sheet. Good.

  Thus, the plated steel sheet on which the resin film is laminated and coated proceeds to the second heating means 7 and is heated to a temperature necessary for embossing the resin film (embossing temperature). In this case as well, it is necessary to rapidly heat the resin-coated plated steel sheet, and it is preferable to heat by using an induction heating method. Although the heating temperature (embossing temperature) depends on whether or not the resin film is in an oriented crystallization state, it is heated to a temperature above the softening temperature of the resin film, and in some cases above the melting point of the resin film, but the temperature is too high. The processed embossed pattern disappears after processing, and if the temperature is too low, a clear embossed pattern cannot be obtained. The preferred heating temperature range is narrower than the heating temperature range of the laminate coating of the resin film, and the state of the resin film to be used, for example, whether there is orientation crystallization, a single layer film, or a multilayer film consisting of a plurality of resins having different melting points Depending on whether it is present, it is necessary to adjust the heating temperature appropriately and strictly.

  In this way, the resin-coated plated steel sheet 10 heated by the second heating means 7 is sandwiched by using a pair of embossing rolls 8 in which an embossed pattern is engraved on at least the side on which the resin film is laminated and coated. Emboss the surface. When the resin film is laminated and coated also on the other surface side of the plated steel plate, the other surface side may be embossed using the embossing roll 8. In addition, the resin film may be mirror-gloss processed using a mirror roll instead of the emboss roll.

  The resin-coated plated steel sheet 10 having an embossed pattern formed on the surface of the resin film in this way is wound up on a winding means 2 such as a coiler. After embossing, the resin-coated plated steel sheet 10 may be rapidly cooled by immersing it in a cooling tank filled with a coolant such as water (not shown). The manufacturing method and manufacturing apparatus of a resin-coated plated steel sheet having an embossed pattern according to the present invention are configured as described above.

(Example)
Decoiler for Zn-plated steel sheet coated with polyester resin as adhesive on one side (plate thickness 0.4 mm, nominal Zn plating thickness (single side) 12.8 μm, variation in plating thickness in the width direction (single side) 10 to 16.8 μm) Unwinding, induction heaters (edge heating means) by induction heating arranged on both sides of the plated steel plate, and induction arranged in two rows (6 and 5 in each row) in a staggered manner in the width direction of the plated steel plate A portion having a low temperature in the plate width direction was heated using a heater (internal heating means) by heating, and then the entire plate width direction was heated using an induction heating device (first heating means). At the time of heating, a plate temperature measuring means (radiation thermometer) is disposed immediately before contacting the resin film, the position of the low temperature portion in the plate width direction and the temperature of the low temperature portion are specified, and the plate is determined based on the result. The edge heating means and the internal heating means were controlled so that the temperature difference in the width direction was 6 ° C. or less. After heating the Zn-plated steel sheet so that the temperature in the sheet width direction is uniformly 240 ° C. in this way, two layers of a biaxially oriented polyester resin film (upper layer: white polyethylene terephthalate (thickness 25 μm)) are provided on one side thereof. Lower layer: Yellow polybutylene terephthalate (thickness 75 μm) is unwound from a film uncoiler and heated to a Zn-plated steel sheet so that the polybutylene terephthalate layer is in contact with and sandwiched by using a pair of pressure contact rolls The two-layer resin film was laminated and coated on a Zn-plated steel sheet. Next, this two-layer resin film-coated Zn-plated steel sheet was heated to 225 ° C. using an induction heating device (second heating means). The two-layer resin film-coated Zn-plated steel sheet thus heated is sandwiched and pressed with a pair of embossing rolls so that an embossing roll with an embossed pattern engraved on the resin film coating side is pressed and pressed. The embossed pattern was formed on the surface of the layer resin film, and then wound around a coiler.

  A test piece having a size of 5 cm × 5 cm was cut out from both end portions and the center portion in the width direction from the two-layer resin film-coated Zn-plated steel sheet having an embossed pattern thus obtained. No peeling of the resin film was observed in the test piece. Moreover, although the embossed pattern on the surface of the resin film was visually observed, a clear embossed pattern was formed in any of the test pieces.

(Comparative example)
In the examples, the same Zn-plated steel sheets and two-layer resin as in the examples except that the preheating of the Zn-plated steel sheets using an edge heater (end heating means) and a heater (internal heating means) by induction heating was omitted. Film, induction heating device, pressure roll. Using an embossing roll, a two-layer resin film was laminated and coated on a Zn-plated steel sheet under the same conditions as in Example 1 and embossed. From the thus obtained two-layer resin film-coated Zn-plated steel sheet, test pieces having a size of 5 cm × 5 cm were cut out from both ends and the center in the width direction and bent at 180 ° to obtain thick ends of Zn plating. The resin film peeled off from the test piece cut out from 1. Moreover, although the embossed pattern on the surface of the resin film was visually observed, the test piece cut out from both ends had an embossed pattern that was less clear than the test piece cut out from the central part.

  By using the method and apparatus for producing a resin-coated plated steel sheet having an embossed pattern according to the present invention, even in a plated steel sheet with a varying plating thickness in the plate width direction, the adhesion to the resin film is excellent, and the resin surface It is possible to manufacture a resin-coated plated steel sheet on which a clear embossed pattern having uniform uniformity in the sheet width direction is formed.

Schematic which shows an example of the manufacturing apparatus of the resin coating plating steel plate which has the embossing pattern of this invention. Schematic which shows another example of the manufacturing apparatus of the resin coating plating steel plate which has an embossing pattern of this invention. The side view which shows the outline of the pre-heating part of the manufacturing apparatus shown in FIG. The top view which shows the outline of the pre-heating part shown in FIG.

Explanation of symbols

1: Unwinding means 2: Winding means 3: Partial heating means 3a: End heating means 3b1: Internal heating means 3b2: Internal heating means 4: First heating means 5: Resin film supply means 6: Pressure roller 7: Second heating means 8: Embossing roll 9: Deflector roll 10: Plated steel sheet 11: Sheet temperature measuring means 20: Apparatus for producing resin-coated plated steel sheet having an embossed pattern

Claims (7)

Heat the plated steel sheet to the bonding temperature of the resin film using the first heating means,
Next, a resin film is brought into contact with the steel plate,
Using a pair of adhesive rolls, sandwiched and pressed into a resin-coated plated steel sheet,
Continue to heat to the embossing temperature of the resin film using the second heating means,
At least one side is embossed with a pair of embossed rolls engraved with an embossed pattern to emboss the resin film surface.
In the method for producing a resin-coated plated steel sheet having an embossed pattern,
Before or after heating the plated steel sheet using the first heating means,
Using a partial heating means consisting of an end heating means for heating both ends of the plated steel sheet and an internal heating means for heating the inside of the plated steel sheet in the width direction, the plated steel sheet is heated by locally changing the heating temperature. ,
When making the temperature distribution in the width direction of the plated steel sheet uniform ,
The method for producing a resin-coated plated steel sheet having an embossed pattern, wherein the internal heating means is arranged in two rows in a staggered manner in the width direction of the plated steel sheet. The production of a resin-coated plated steel sheet having an embossed pattern according to claim 1 , wherein the end heating means 3a and the internal heating means 3b are controlled so that the temperature difference in the plate width direction is 6 ° C or less. Method. End heating means and a plurality of internal heating means of the partial heating means, and a first heating means and second heating means, characterized by using the respective induction heating device, embossing according to claim 1 or 2 A method for producing a resin-coated plated steel sheet having a pattern. The method for producing a resin-coated plated steel sheet having an embossed pattern according to any one of claims 1 to 3, wherein a plated steel sheet obtained by previously applying an adhesive to the surface is used. A first heating means for heating the plated steel sheet to the adhesion temperature of the resin film;
A resin film supply means for supplying the resin film to the plated steel sheet;
A pair of pressure-contacting rolls in which a resin film is in contact with and sandwiched between the plated steel plates and pressed into a resin-coated plated steel plate;
A second heating means for heating the resin-coated plated steel sheet to the embossing temperature of the resin film;
At least one of embossing the resin film surface with the resin-coated plated steel sheet sandwiched between it consists of a pair of embossed rolls engraved with an embossed pattern,
In the production equipment for resin-coated plated steel sheets with embossed patterns,
Before or after heating the plated steel sheet using the first heating means,
In order to make the temperature distribution in the width direction of the plated steel sheet uniform by heating the plated steel sheet by locally changing the heating temperature,
A partial heating means comprising an end heating means for heating both ends of the plated steel sheet and an internal heating means for heating the inside in the width direction of the plated steel sheet;
The apparatus for producing a resin-coated plated steel sheet having an embossed pattern, wherein the internal heating means is arranged in two rows in a staggered manner in the width direction of the plated steel sheet. The production of a resin-coated plated steel sheet having an embossed pattern according to claim 5 , wherein the end heating means 3a and the internal heating means 3b are controlled so that the temperature difference in the plate width direction is 6 ° C or less. apparatus. The embossed pattern according to claim 5 or 6 , wherein the end heating means, the plurality of internal heating means, the first heating means and the second heating means of the partial heating means are induction heating devices. Production equipment for resin-coated plated steel sheets.

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