JPH0679787A - Production of metal/resin laminate - Google Patents

Abstract

PURPOSE:To accurately laminate a resin film to a metal substrate by a method wherein the resin film is superposed on the surface of the metal substrate so that both side edge parts thereof laterally protrude from the edge parts of the metal substrate to be heated and the regions containing the edge parts of the metal substrate of the resin film are pressed by rolls to cut the parts protruding from the metal substrate of the resin film. CONSTITUTION:When a metal strip plate 1 and a resin film 2 are pressed by composite rolls 5, compression force acts on the interior of the resin film 2 and the resin film 2 is heated and softened by a preheated metal strip plate 1 and the flow of a material is generated in the resin film 2. However, since both side edge parts of the resin film 2 protrude from both side edges of the metal strip plate 1, no compression force acts on these protruding parts 2' and no flow is generated. Therefore, the stress or flow of a material generated in the resin film 2 is different across the parts corresponding to both side edges of the metal strip plate 1 and the physical properties of the resin film change and cutting parts A are formed to the resin film 2 corresponding to both side edges of the metal strip plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a metal resin laminate in which a resin film such as a hot melt adhesive resin is heat-welded to a metal substrate such as a stainless steel thin plate. More specifically, the present invention provides a method for producing a metal resin laminate capable of accurately laminating the above resin film on a metal substrate.

[0002]

2. Description of the Related Art Conventionally, a metal resin laminated product in which a resin layer is laminated on a metal substrate has been used for various purposes. For example, recently, a laminate in which a resin layer of a hot melt adhesive is laminated on a thin plate of stainless steel has been developed. This type of metal resin laminate can be easily bonded to the surface of a resin or metal member through the hot-melt adhesive layer, and it can be used for automobile parts and various types of plating instead of conventional plating and clad. Is widely used in parts.

Conventionally, in order to produce such a metal resin laminate, a method of heating a resin of a hot melt adhesive to plasticize it and coating the plasticized resin on the surface of a metal substrate with a T-die or the like. There is. In addition, a strip-shaped resin film of the above hot-melt adhesive is manufactured in advance,
There is also a method of stacking this resin film on a stainless steel thin strip plate, heating them and pressing them with a pair of pressure rolls, and heat welding this resin film to the stainless strip plate.

In the former method, the entire surface of the metal substrate can be accurately coated with resin, but the equipment is large-scale and the cost is high. On the other hand, the latter one has an advantage that it can be manufactured at a low cost by using a small-scale facility.

However, in this latter method, since the strip-shaped resin film is soft, it is difficult to accurately stack it on the stainless steel strip plate, and the edge portion of the resin film is made of stainless steel. The edge of the strip of resin, or the edge of the resin film is biased toward the center side from the edge of the strip of stainless steel, and on the edge of the metal substrate there is a portion where the resin film is not laminated. It is done. For this reason, conventionally, stainless steel strips having a width wider than that of the strip to be the final product and a resin film are stacked and laminated, and defective portions on both side edges are cut to form a strip-shaped metal resin having a predetermined width. A laminate was being manufactured.

However, such a conventional method has a problem that the number of steps is increased, and both side edges of the stainless steel strip and the resin film are wasted, resulting in an increase in manufacturing cost.

[0007]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and the resin film can be accurately laminated on the metal substrate, and the manufacturing is easy and the cost can be reduced. The present invention provides a method for producing a metal resin laminate that can be manufactured.

[0008]

According to the present invention, a resin film such as a hot-melt adhesive is superposed on the surface of a metal substrate such as a thin strip of stainless steel so as to project laterally from its edge, and the resin film is superposed. The metal base and the resin film are heated, and a region including the edge portion of the metal base is pressed by a roll. Then, the resin film portion laterally protruding from the edge of the metal base is cut and removed from the cutting portion formed at a position corresponding to the edge of the metal base.

[0009]

The above-mentioned resin film is heat-welded to the surface of the above-mentioned metal substrate by heating and pressurizing. Further, since this resin film extends beyond the edge of the metal substrate to the outside thereof and is pressed up to the edge portion of this metal substrate at the time of pressing, the edge of the metal substrate of this resin film is While shearing acts on the corresponding portion, a sharp discontinuity occurs in the deformation and flow of the material inside the resin film with this edge portion as a boundary. Therefore, a cut portion is formed at a portion of the resin film corresponding to the edge of the metal substrate. The cutting portion varies depending on conditions such as pressurization and heating, the thickness and material of the resin film, etc., but at the same time as the above-mentioned pressurization, it is completely cut at this portion, or is easily cut by a slight external force. It is a part. Moreover, this cutting portion has an extremely sharp and smooth cutting surface. Therefore, by removing the resin film outside the cut portion, the resin film can be completely and accurately heat-sealed to the edge of the metal substrate. Therefore, it is not necessary to cut the edge of the metal substrate for finishing, and there is no waste of material. Further, the method of the present invention can be carried out in a small-scale facility like the conventional method, and the manufacturing cost can be reduced.

[0010]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention. This is a case where a resin film of hot-melt resin is heat-welded to the entire surface of a thin strip of stainless steel.

1 and 2 show an outline of an apparatus for carrying out the method of the present invention. This is manufactured by laminating a resin film 2 of a hot-melt adhesive such as ethylene / vinyl acetate copolymer (EVA) on a metal substrate, for example, a thin metal strip 1 made of stainless steel by heat welding to produce a metal resin laminate. It is a device that does.

The metal strip 1 is supplied from the supply roll 3 in a substantially horizontal direction. The metal strip 1 supplied from the supply roll 3 passes through the inside of the preheating device 4. The metal strip 1 is heated to a predetermined temperature when passing through the preheating device 4.

Next, the resin film 2 is placed on the metal strip 1 heated by the preheating device 4. This resin film 2 is in the form of a strip, is supplied from a resin film roll 6, is guided by a guide roll 7, and is superposed on the above-mentioned metal strip plate 1. The width of the resin film 2 is wider than the width of the metal strip 1 as shown in FIG. 2, for example, about 20 mm. Then, as shown in FIG. 3, the resin film 2 is overlapped so that both side edge portions thereof are protruded outward by about 10 mm from both side edge portions of the metal strip plate 1.

The metal strip 1 and the resin film 2 thus stacked pass between a pair of composite rolls 5 and are pressed by the composite rolls 5 with a predetermined pressure as shown in FIG. It The width of these composite rolls 5 is wider than the width of the metal strip 1 described above, and thus this metal strip 1
The resin film 2 is pressed by the composite roll 5 at the entire part including both side edges of the metal strip 1.

As the metal strip 1 and the resin film 2 pass between the composite rolls 5, they are welded at a predetermined temperature and pressure. In this case, the resin film 2 at the portions corresponding to the both side edges of the metal strip 1 described above.
A cut portion A is formed in the. That is, when the metal strip 1 and the resin film 2 are pressed by the composite roll 5, a compressive force acts in the resin film 2,
The resin film 2 is heated and softened by the preheated metal strip 1, so that a material flow or the like occurs in the resin film 2. However, since both side edges of the resin film 2 project from both side edges of the metal strip 1 described above, no compressive force acts on the projecting portion 2 ′, and the inside of this portion is made of the material. No flow will occur. Therefore, the stress generated in the resin film 2 and the flow of the material are different from each other with the portions corresponding to the both side edges of the metal strip 1 as boundaries, and these are discontinuous at this boundary. The physical properties of the material of the resin film 2 change inside. Therefore, this resin film 2
Is a cut portion A at a portion corresponding to both side edges of the metal strip 1.
The cut portion A is completely cut by the pressure applied by the composite roll 5 described above, or is easily cut from the cut portion A by applying a slight force from the outside. It is something.

In the above embodiment, the metal strip 1 is heated by the preheating device 4, and then the resin film 2 is used.
Since these are overlapped with each other, when these are pressed by the composite roll 5, the resin film 2 is heated only in the portion overlapped with the metal strip 1, and the portions protruding from both side edges of the metal strip 1 are heated. Not done. Therefore, the heating state in the cut portion A corresponding to both side edges of the metal strip 1 is also discontinuous, the change in the physical properties in the cut portion A becomes large, and the cutting in the cut portion A becomes more reliable. The portions 2 of the resin film 2 protruding from both sides of the metal strip 1
Since ′ is not heated, this part 2 ′ can be reused. Further, when such a resin film 2 is welded to both side surfaces of the metal strip plate 1, these portions 2 '
However, they are not heat-welded to each other, and these can be reused.

As described above, the metal strip 1 and the resin film 2 which have passed through the composite roll 5 are heat-welded to each other, and the protruding portions 2'of both side edges of the resin film 2 are respectively wound by the take-up roll 8. It is wound up and this part 2'is removed, as shown in FIG.

The metal resin laminate 12 thus laminated is heated by the post-heating device 9 to be more surely welded, then cooled by the cooling device 10 and coiled by the laminate winding device 11. To be wound up.

According to such a method, even if the resin film 2 to be overlaid on the metal strip plate 1 is slightly displaced in the width direction, the resin film 2 can be surely covered over the entire width of the metal strip plate 1. It can be laminated. Further, at the time of pressurization, the resin film 2 is cut from the cut portion A corresponding to the edge portion of the metal strip 1, and the cut surface is sharp and smooth. Therefore, the laminated body 12 is a product in which the edge portion thereof is completely welded with the resin film, and it is not necessary to cut both side edge portions of the laminated body as in the conventional case.
Therefore, the material is not wasted, the process is simple, and the cost can be reduced.

The conditions for carrying out the above method are as follows:
It goes without saying that it changes depending on the material and thickness of the metal strip 1 and the resin film 2 used. For example, as the metal strip 1 described above, S having a width of 150 mm and a thickness of 0.2 mm is used.
These were laminated using a strip of US430 stainless steel, and using EVA having a width of 170 mm and a thickness of 0.1 mm as the resin film 2. In this case, the preheating temperature of the metal strip 1 in the above-mentioned preheating device 4 is 130 ° C, and when the resin film 2 is superposed on this and pressed by the composite roll 5, these metals are not heated. The temperature of the strip 1 and the resin film 2 becomes 130 ° C. The pressure applied at this time is 1.0 kg / square cm. In addition, the temperature of the post-heating by the post-heating device 9 after being laminated is 150 ° C.

Under these conditions, the metal strip 1
When the resin film and the resin film were joined together, they were completely heat-welded to obtain an integral metal resin laminate 12. Further, in this state, the edge portions 2'of both sides of the resin film 2 are
Was completely cut from the cutting portion A after passing through the composite roll 5, and was wound around the winding roll 8.

In order to cut the resin film 2 along the edge of the metal strip 1 by pressing with the composite roll 5, it is preferable to control the temperature and pressure during this pressing within a predetermined range. If the heating temperature at the time of pressurization is too high, good cutting cannot be performed at the cutting portion A of the resin film 2. If the heating temperature at the time of pressurization is too low, not only the resin film 2 will not be cut well, but also the heat welding between the resin film 2 and the metal strip 1 may be incomplete. There is. The present invention is not limited to the case of producing the above-mentioned metal resin laminate, and can also produce other forms of metal resin laminate.

For example, FIGS. 6 to 10 show a second embodiment of the present invention. This is a case of manufacturing a metal-resin laminate having a portion where the resin film 2 is not laminated on one edge of the metal strip 1. Note that this embodiment is the same as the first embodiment except for the following description, and in FIGS. 6 to 10, parts corresponding to those of the first embodiment are designated by the same reference numerals. The description is omitted.

That is, in this embodiment, the width of the resin film 2 is narrower than that of the metal strip 1 and one edge of the resin film 2 is one edge of the metal strip 1. It is located closer to the center side, and therefore, the resin film 2 is not laminated on one edge of the metal strip 1 and the surface of the metal strip 1 is exposed at this portion.

In this embodiment, as in the case of the first embodiment, first, as shown in FIG. 8, the resin film 2 is used.
Are stacked on the metal strip 1. In this case, one edge 2 ″ of the resin film 2 is arranged at a position deviated from one edge of the metal strip 1 toward the center side, and the other edge of the resin film 2 is disposed on the metal strip. It is arranged so as to extend outward from the other edge of 1. Then, the resin film 2 and the metal strip 1 are pressed by a pair of composite rollers 5 as shown in FIG. 9, and the resin film 2 is heat-welded and laminated on the metal strip 1. In addition, at the time of this pressurization, as in the first embodiment, the metal strip 1
At the position corresponding to the other edge of the resin film 2, a cut portion A of the resin film 2 is formed, and as shown in FIG. 10, the protruding portion 2 ′ of the edge portion of the resin film 2 is cut from this cut portion. Then removed.

Further, by combining the methods as in the first and second embodiments as described above, various forms of metal resin laminates can be manufactured. For example, as shown in FIG. 11, the resin film 2 is laminated only on a part of the upper surface of the metal strip 1 as in the second embodiment, and the lower surface of the metal strip 1 is formed with the first film. It is also possible to manufacture a product in which the resin film 2 is welded on the entire surface as in the embodiment.

Further, as shown in FIG. 12, a resin film 2 is laminated on the entire surface of the metal strip 1 as in the first embodiment, and both sides of the lower surface of the metal strip 1 are stacked. It is also possible to stack the resin films 2 on the edge portions as in the second embodiment, and to form a portion where the resin films are not stacked only in the central portion of the lower surface of the metal strip 1.

Further, as shown in FIG. 13, the resin film 2 may be laminated only on one edge portion of the upper surface and the lower surface of the metal strip 1 as in the second embodiment. Further, as shown in FIG. 14, a product in which the resin film 2 is laminated only on one edge portion of the upper surface of the metal strip 1 and the other edge portion of the lower surface as in the second embodiment is manufactured. You can also

Further, FIGS. 15 to 17 show a third embodiment of the present invention. This is one in which a resin film is laminated on a plurality of metal substrates, for example, metal strips at the same time, and the resin film is cut at the edges of these metal strips.

That is, in the case of the third embodiment,
A plurality of narrow metal strips 1a, 1b, 1c, 1d are prepared, and as shown in FIG. 15, they are arranged parallel to each other and adjacent edges are in close contact with each other. Then, one sheet of resin film 2 is placed on these metal strips, and is heated and pressed to heat-seal the resin film 2 to the metal strips 1a, 1b, 1c, 1d. At the same time, cut portions are formed in the resin film 2 at the portions corresponding to the edges of the metal strips, and the resin film 2 is cut from these cut portions.
As shown in FIG. 6, a plurality of metal strips 1a, 1b, 1c, 1d
A product in which a resin film is welded on the entire surface of each is manufactured.

FIG. 17 shows an apparatus for manufacturing such a product. This device has basically the same structure as the above-mentioned device, but is provided with winding rolls 8 for winding up and down the cut side edges of the resin film 2 separately. The cut edges are wound up and down in different directions. Further, guide rollers 21 are provided above and below the composite roll 5. The plurality of metal strips laminated with the resin film are alternately separated into upper and lower portions, that is, the metal strips 1a and 1c are upper guide rollers and the metal strips 1b and 1d are lower guide rollers, respectively. Be guided. Therefore, as shown in FIG. 16, the adjacent metal strips move in different directions in the vertical direction, and the resin film 2 is reliably cut at these edge portions.

It should be noted that the resin film 2 can be surely cut if there is a slight gap between the metal strips. However, in this embodiment, the thickness of the resin film 2 is about 0.1 mm, and when the resin film is thin, even if the edges of these adjacent metal strips are in a close contact state, the resin film is not enough. Can be disconnected.

The present invention is not limited to the above embodiment. For example, the metal substrate does not have to have the above strip shape, and the material thereof is not limited to stainless steel. The material of the resin film is not limited to the above, and various kinds of resins can be used as long as they are heat-weldable resins.

For example, as the material of the above-mentioned metal substrate, iron, iron alloy, aluminum, aluminum alloy, nickel, nickel alloy, copper, in addition to the above-mentioned stainless steel,
Copper alloys and other metals can be applied. In addition, the surface of these metal substrates may be surface-treated if necessary.

As the material for the resin film, in addition to the EVA described above, a polyolefin-based material, a polyester-based material,
Polyamide-based, polyimide-based, acrylic-based, rubber-based, urethane-based thermoplastic resins and other resin materials can be used. Further, this resin film may have a structure in which another type of resin is laminated in two or more layers.

In the present invention, the thickness of the above-mentioned metal substrate or resin film is not essentially important. However, in the apparatus and method of the above-described embodiment, the thickness of the metal substrate, that is, the metal strip is 0.03 to 3.0 mm, but the thickness is 0.05 to 1.0 mm. Preferably up to.

The thickness of the resin film in the above embodiment is 0.03 to 1.0 mm, preferably 0.03 to 1.0 mm.
The range is 0.1 mm. The conditions of heat welding by heating and pressurizing are of course different depending on the material and thickness of these resin films. For example, the heating temperature is 80 to 250 ° C and the pressurizing pressure is 0.1 to 20 kg. / Square cm range.

[0038]

As described above, according to the present invention, the resin film laminated on the metal substrate can be cut sharply and smoothly at the edge portion of the metal substrate. Therefore, the resin film can be completely laminated up to the edge portion of the metal substrate, and it is not necessary to cut the edge portion of the metal substrate for finishing. Therefore, there is no waste of material,
Also, the process is simple, and the manufacturing cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic side view of an apparatus used in a first embodiment of the present invention.

2 is a schematic plan view of the apparatus of FIG.

FIG. 3 is an explanatory view of a process of stacking a resin film on a metal strip plate by the method of the first embodiment.

FIG. 4 is an explanatory diagram of a pressurizing step of the method of the first embodiment.

FIG. 5 is an explanatory diagram of a separation step of the method of the first embodiment.

FIG. 6 is a schematic side view of an apparatus used in the second embodiment of the present invention.

7 is a schematic plan view of the apparatus of FIG.

FIG. 8 is an explanatory view of a process of stacking a resin film on a metal strip plate by the method of the second embodiment.

FIG. 9 is an explanatory diagram of a pressurizing step of the method of the second embodiment.

FIG. 10 is an explanatory diagram of a separation step of the method of the second embodiment.

FIG. 11 is an explanatory diagram of the configuration of another product.

FIG. 12 is an explanatory diagram of the configuration of still another product.

FIG. 13 is an explanatory diagram of the configuration of still another product.

FIG. 14 is an explanatory diagram of the configuration of still another product.

FIG. 15 is an explanatory diagram of a stacking step of the method according to the third embodiment of the present invention.

FIG. 16 is an explanatory diagram of a separation step of the method according to the third embodiment of the present invention.

FIG. 17 is a schematic side view of an apparatus used in the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal strip 2 ... Resin film 2 '... Both side edge parts 4 ... Preheating device 5 ... Composite roll 6 ... Resin film supply roll

Claims (5)

[Claims] 1. A method for producing a metal-resin laminate by heat-sealing a resin film on a metal substrate, the method comprising: stacking a resin film on the surface of the metal substrate so as to project laterally from an edge thereof. , The laminated metal substrate and the resin film are heated and pressed by a roll including the edge portion of the metal substrate, and the resin film is heat-welded to the surface of the metal substrate and corresponds to the edge portion of the metal substrate. And a step of forming a cut portion having changed physical properties in the resin film portion, and a step of removing the resin film portion protruding laterally from the edge portion of the metal substrate by cutting from the cut portion. A method for producing a metal-resin laminate, comprising: 2. The step of heating and pressing the metal base and the resin film, wherein the metal base is heated before the resin film is overlaid on the metal base. A method for manufacturing a metal resin laminate. 3. The metal base is a strip-shaped thin metal plate, and the resin film is a strip-shaped thin film, and the width of the strip-shaped resin film is wider than the width of the strip-shaped thin metal plate. The resin films are stacked so that their both sides project from both edges of the thin metal plate, heated and pressed to heat-weld them, and the resin film portions projecting from the both edges of this thin metal plate are cut and removed. The method for manufacturing a metal-resin laminate according to claim 1. 4. The metal base is a strip-shaped thin metal plate, and the resin film is a strip-shaped resin film. One side edge of the strip-shaped resin film is separated from one side edge of the metal thin plate. The other side edge of the strip-shaped resin film is projected and placed on the strip-shaped thin metal plate, and is overlapped by heating and pressing so as to expose a part of the thin metal plate in the width direction. The method for producing a metal resin laminate according to claim 1, wherein the resin film portion protruding from one side edge of the metal thin plate is cut and removed while heat-sealing. 5. A plurality of separate metal substrates are arranged adjacent to each other, and the resin film is superposed on the plurality of metal substrates and is heated and pressed to be heat-welded. The method of manufacturing a thin metal plate laminate according to claim 1, wherein the resin film is cut at each edge of the plurality of metal substrates.