JP3182456B2 - Method for manufacturing metal resin laminate - Google Patents

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 in which the above resin film can be accurately laminated on an arbitrary portion on a metal substrate.

[0002]

2. Description of the Related Art Conventionally, metal resin laminated products in which a resin layer is laminated on a metal base have been used for various applications. For example, recently, a laminate in which a resin layer of a hot melt adhesive is laminated on a stainless steel thin plate has been developed. Such a metal resin laminate can be easily adhered to the surface of a resin or metal member through the hot melt adhesive layer, and can be used instead of conventional plating and cladding for automobile parts and various types. Is becoming widespread in parts.

Conventionally, in order to manufacture such a metal resin laminate, a method of heating and plasticizing a resin of a hot melt adhesive and coating the plasticized resin on the surface of a metal substrate with a T-die or the like is known. There is. In addition, a belt-shaped resin film of the above hot melt adhesive is manufactured in advance,
There is also a method in which this resin film is stacked on a stainless steel thin plate, heated and pressed by a pair of pressure rolls, and the resin film is thermally welded to the stainless steel plate.

The former method can accurately coat the entire surface of the metal substrate with the resin, but requires a large-scale facility and high cost. On the other hand, the latter has the advantage that small-scale equipment is sufficient and can be manufactured at low cost.

[0005] The above-mentioned conventional methods are all manufacturing methods intended for a case where a resin is laminated on the entire surface of a metal substrate. By the way, in the metal resin laminate as described above, depending on the use and other conditions, the resin may not be laminated on the entire surface of the metal substrate but must be laminated only on a predetermined portion.

In such a case, it is conceivable that in the latter method, the resin film is cut into a predetermined shape in advance, the resin film is arranged at a predetermined position on the metal base, and heat-welded. . However, since resin films such as hot melt adhesives are generally thin and soft, it is extremely difficult to punch the resin film into a predetermined shape in advance or to position and arrange it at a predetermined position. Was. Also, when the resin film punched in a predetermined shape in this way is heated and pressed and heat-sealed, the edge of the resin film is deformed by heat and pressure, and the shape of the edge of the resin film is incorrect. There is also a problem that becomes. For this reason, it has been difficult for such a metal resin laminate to efficiently produce a product in which the resin is laminated only on a part of the surface by the conventional production method.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to accurately laminate a resin film at a predetermined position on the surface of a metal substrate, and to easily manufacture a metal resin. It is intended to provide a method for producing a laminate.

[0008]

According to the present invention, a resin film such as a hot-melt adhesive is superimposed on a surface of a metal substrate such as a stainless steel thin plate and a predetermined position between the resin film and the metal substrate. Then, a non-thermoplastic film which is not softened by heat is interposed therebetween, and thereafter, the metal substrate and the resin film are heated and pressurized.

[0009]

The above-mentioned resin film is heat-welded to the surface of the above-mentioned metal substrate by heating and pressing. In addition, a portion corresponding to the edge of the non-thermoplastic film of the resin film is sheared, and a sharp discontinuity occurs in the deformation and flow of the material inside the resin film at the edge portion. . Therefore, a cut portion is formed at a portion of the resin film corresponding to the edge of the non-thermoplastic film.
This cutting part is different depending on conditions such as pressure and heating, non-thermoplastic film, thickness and material of resin film, etc., but it is completely cut at this part simultaneously with the above-mentioned pressurization, or with a slight external force. Easy to cut. Moreover, this cut portion has a very sharp and smooth cut surface. Therefore, if the resin film in the cut portion is removed together with the non-thermoplastic film, a non-laminated portion in which the resin film is not welded to the metal base is formed in this portion. Therefore, this resin film can be welded and laminated only on an arbitrary portion of the metal substrate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below 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 a hot melt resin is heat-welded to a metal substrate, for example, a thin strip of stainless steel, except for a strip in the center in the width direction.

FIGS. 1 and 2 show an outline of an apparatus for implementing the method of the present invention. In this method, a resin film 2 of a hot-melt adhesive such as ethylene-vinyl-acetate copolymer (EVA) is laminated on a metal substrate, for example, a thin metal strip 1 of stainless steel by thermal welding to produce a metal-resin laminate. It is a device to do.

The metal strip 1 is supplied from a supply roll 3 in a substantially horizontal direction. The metal strip 1 supplied from the supply roll 3 passes through 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 stacked on the entire surface of the metal strip 1 heated by the preheating device 4. The 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 metal strip 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 films 2 are stacked so that both side edges thereof protrude outward by about 10 mm from both side edges of the metal strip 1 respectively.

In addition, the resin film 2
A non-thermoplastic film 13 is supplied between the metal strip 1 and the metal strip 1. The non-thermoplastic film 13 is made of a material that does not soften by heat and does not have the property of being welded to other members by heat, for example, release paper. It is a strip having a width corresponding to the width of the portion not to be welded. The non-thermoplastic film 13 is supplied to the non-thermoplastic film supply roll 1.
4 and is guided by the above-mentioned guide rolls 7 and is supplied between the central portion of the metal strip 1 and the above-mentioned resin film 2, and these are stacked as shown in FIG. 3.

Then, these stacked metal strips 1,
The non-thermoplastic film 13 and the resin film 2 pass between the pair of composite rolls 5 and are pressed by these composite rolls 5 at a predetermined pressure as shown in FIG.
The width of these composite rolls 5 is wider than the width of the above-mentioned metal strip 1. Therefore, the entire portion of the metal strip 1 and the resin film 2 including both side edges of the metal strip 1 is made of these composite rolls. 5 is pressed.

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, cut portions A are formed in the resin film 2 at portions corresponding to both side edges of the non-heat-welded film 13. That is, when the metal strip 1 and the resin film 2 are pressed by the composite roll 5, a compressive force acts on the resin film 2 and the resin film 2 The heat is softened by the band plate 1, and a material flow or the like occurs in the resin film 2. However, in the resin film 2, the compression amount of the resin film 2 is different between the portion overlapping with the non-thermoplastic film 13 and the other portion, and the flow of the material inside these portions is different. Are different. Accordingly, the stress generated in the resin film 2 and the flow of the material are different from each other with the portions corresponding to both side edges of the non-thermoplastic film 13 as boundaries,
Since these are discontinuous at this boundary, the physical properties of the material of the resin film 2 change within this boundary. Therefore, the resin film 2 is made of the non-thermoplastic film 1
A cutting portion A is formed in a portion corresponding to both side edges of the cutting portion 3, and this cutting portion A is completely cut by pressurization by the composite roll 5, or a small force is applied from the outside. It is easy to cut from this cut portion A just by cutting.

Also, at portions corresponding to both side edges of the metal strip 1, there are portions having changed physical properties in the resin film 2 in the same manner as described above, and the cut portions B are also formed in these portions in the same manner as described above. It is formed.

The above non-thermoplastic film 13
After passing through these composite rolls 5, the winding roll 1
5 is wound up. Therefore, as shown in FIG. 5, the cut portion 2a at the center of the resin film 2 is wound on the winding roll together with the non-thermoplastic film 13, and the central portion of the metal strip 1 is removed. The non-laminated portion 16 where the resin film 2 is not welded is formed at a portion corresponding to the width of the non-thermoplastic film 13. Further, portions 2b protruding from the edges of the metal strip 1 at both side edges of the resin film 2 are also cut and removed.

The metal resin laminate 12 thus laminated is heated by the post-heating device 9, and after the resin film 2 is more reliably welded, is cooled by the cooling device 10 and is cooled by the cooling device 10. 11 winds it into a coil.

According to such a method, a non-laminated portion where the resin film 2 is not welded is formed at an arbitrary width in the center of the metal strip 1 and the resin film 2 is formed on a portion other than this portion. It can be welded accurately. The non-thermoplastic film 13 is made of, for example, release paper as described above, is relatively hard, and can exert a certain amount of tension. The non-thermoplastic film 13 can be supplied to an accurate position. Is possible. Further, since the non-thermoplastic film 13 does not soften even by heating,
The resin film 2 can be cut accurately and sharply at its edge without being deformed by the above-mentioned heating and pressing.

The cut central portion 2a of the resin film is wound up together with the non-thermoplastic film 13. When the non-thermoplastic film 13 is made of release paper or the like, the resin film portion 2a is removed. Is lightly adhered to the non-thermoplastic film 13 and can be easily peeled off and reused as a resin film.
In this case, the resin film portion 2a and the non-thermoplastic film 13 can be reused as a resin film with a backing sheet without peeling.

When laminating the resin films 2 as described above, it is a matter of course to optimally set the heating temperature and the pressing pressure in accordance with these materials and the like. For example, the above-mentioned metal strip 1 is a stainless steel thin plate having a thickness of 0.2 mm, and the above-mentioned resin film 2 is 0.1 m thick.
In the case of an EVA of m, the preheating temperature is 180 ° C., and the temperature at the time of pressing by the composite roll 5 is 150 ° C. The pressure applied by the composite roll 5 is 1.0
kg / square cm. In this case, the thickness of the non-thermoplastic film 13 is 0.06 mm.

When the above-mentioned resin film 2 is thermally welded and laminated under such conditions, the resin film 2 is completely welded to the metal strip 1 and is pressed by the composite roll 5 to form the resin film 2. 2 was cut completely at the edge of the inserted non-thermoplastic film 13, wound up with the non-thermoplastic film 13, and the cut surface was sharp and smooth.

Of course, such conditions should be set to optimal conditions in accordance with the material, shape, thickness and the like of the above-mentioned metal strip 1, ie, the metal base and the resin film 2. Usually, this heating temperature is 80-
250 ° C, pressurization pressure 0.1 ~ 20.0kg / square c
m.

Further, the thickness of the metal substrate is 0.03 to 0.03.
A resin film having a thickness of 3.0 mm, preferably 0.05 to 1.0 mm, and a thickness of the resin film 2 of 0.03 to 1.0 mm, preferably 0.03 to 0.1 mm is used. Although the thickness of the non-thermoplastic film 13 to be inserted varies depending on the above conditions, it is preferable that the thickness is 1/3 or more of the thickness of the resin film 2.

The present invention is not limited to the above embodiment. For example, FIG. 6 shows a second embodiment of the present invention. This comprises a plurality of narrow non-thermoplastic films 13.
Are supplied between the metal strip 1 and the resin film 2 in parallel at a predetermined interval. As in the first embodiment, the resin film 2 is thermally welded to the metal strip 1 by heating and pressing, and the portions corresponding to the edges of the plurality of non-thermoplastic films 13 are formed. Disconnected at
A plurality of strip-shaped portions corresponding to the portions of the non-thermoplastic film 13 are formed in the non-laminated portion where the resin film 2 is not laminated.

In this embodiment, as the non-thermoplastic film 13, for example, a thin stainless steel plate having a thickness of 0.05 mm, that is, a stainless steel foil is used.
In the case where the width of the supplied non-thermoplastic film 13 is narrow as in the case of this embodiment, if a material such as release paper is used as the material, the strength is insufficient and sufficient tension is given. In addition, it is difficult to supply these non-thermoplastic films 13 to accurate positions. However, if such a stainless steel foil is used, it has sufficient strength and rigidity, so that such a thin non-thermoplastic film 13 can be supplied accurately and reliably.

Further, in the second embodiment, the resin film 2 is thermally welded to the non-thermoplastic film, that is, the stainless steel foil 13, so that a product in which the stainless steel foil 13 and the resin film 2 are laminated can be manufactured simultaneously. become.
Therefore, this second embodiment can be applied for other purposes. For example, when the metal substrate on which the resin film is to be laminated is a thin metal foil, it is difficult to superimpose the resin film on the metal foil and supply these to the composite roll as they are. That is, such a thin metal foil is often insufficient in strength and rigidity to withstand the tension when supplied between a pair of composite rolls, and the metal foil is wrinkled, May tear. However, as described above, if this metal foil is inserted between the metal strip 1 and the resin film 2 as a non-thermoplastic film, a very large tension does not act on the metal foil, and Since the foil is pressed by the composite roll 5 in a state of being superimposed on the relatively thick metal strip 1, this metal foil does not wrinkle or tear.

FIG. 7 shows a method according to a third embodiment of the present invention. This is the above-mentioned non-thermoplastic film 1
3 is not a single piece but a two-layer one. For example, the non-thermoplastic film includes a release paper 13a as described above and a metal foil 13 such as a stainless steel thin plate.
b) is used. The non-thermoplastic film 13 is interposed between the metal strip 1 and the resin film 2 and is heated, pressed and laminated in the same manner as in the first embodiment.

This is similar to the first embodiment described above.
The central portion of the resin film 2 is the non-thermoplastic film 13
Is cut off at the edges of the strip. In this embodiment, since the non-thermoplastic film 13 is formed by laminating the metal foil 13b and the release paper 13a, the rigidity and strength of the non-thermoplastic film 13 are large, and the non-thermoplastic film 13 is supplied accurately. It is possible to In addition, since the release paper 13a comes into contact with the metal strip 1, the metal strip 1 is not damaged.

In the method of the third embodiment, the resin film 2 is heat-welded to the metal foil 13b and laminated as in the case of the second embodiment.
By peeling the release paper 13a from 3b, a product in which the resin film 2 is laminated on the metal foil 13b can be manufactured.

Further, in the present invention, the shape of the non-thermoplastic film is not limited to a band shape, but may be various shapes. For example, FIG. 8 shows a fourth embodiment of the present invention, in which the above-mentioned non-thermoplastic film 13c is not a simple strip, but has a complicated shape according to the application and specifications. This non-thermoplastic film 13
The portion corresponding to the shape of c is a non-laminated portion. Therefore, in this embodiment, the non-thermoplastic film 13c
As long as it has a shape and dimensions that can punch out
A non-laminated portion having an arbitrary shape can be formed on the metal strip 1.

The non-thermoplastic film is not always required to be continuous. For example, the fifth thermoplastic film shown in FIG.
As in the embodiment, a plurality of non-thermoplastic films 13d that are not continuous may be attached to a predetermined position of the metal strip 1. In this case, a portion corresponding to the shape of the non-thermoplastic film 13d is formed in a non-laminated portion where no resin film is laminated.

Further, the present invention is not limited to the above embodiments. For example, the resin film can be laminated not only on one side of the metal strip but also on both sides by heat welding. In addition, the metal substrate does not have to be a belt-like material as described above, and its material is not limited to stainless steel. Also, the material of the resin film is not limited to the above,
Various resins can be used as long as they can be thermally welded.

For example, as the material of the metal base, in addition to the above stainless steel, iron, iron alloy, aluminum, aluminum alloy, nickel, nickel alloy, copper,
Copper alloys and other metals can be applied. Further, the surface of these metal substrates may be subjected to a surface treatment as necessary.

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

Further, the material of the non-thermoplastic film is not limited to the release paper or the metal foil as described above, but may be other paper, a sheet of glass fiber, a sheet of a high melting point resin, or another sheet. Things can be used.

[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 of the non-thermoplastic film. The portion may be removed together with the non-thermoplastic film, and the portion may be a non-laminated portion where the resin film is not laminated. Therefore, a non-laminated portion having an arbitrary shape can be formed on the metal base in accordance with the shape of the non-thermoplastic film and the like, and the resin film can be laminated only on an arbitrary portion. Further, the present invention can be easily implemented with simple equipment, and the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory view of a step of stacking a non-thermoplastic film and a resin film on a metal strip by the method of the first embodiment.

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

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

FIG. 6 is an explanatory diagram of a second embodiment of the present invention.

FIG. 7 is an explanatory view of a third embodiment of the present invention.

FIG. 8 is an explanatory view of a fourth embodiment of the present invention.

FIG. 9 is an explanatory view of a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal strip plate 2 ... Resin film 4 ... Preheating device 5 ... Composite roll 6 ... Resin film supply roll 13 ... Non-thermoplastic film 13a ... Release paper 13b ... Metal foil

────────────────────────────────────────────────── (5) References JP-A-54-139977 (JP, A) JP-A-52-32053 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 65/00-65/82

Claims (6)

(57) [Claims] 1. A method for producing a metal-resin laminate by thermally welding a resin film to a metal substrate, comprising: laminating a resin film made of a thermoplastic resin on the surface of the metal substrate; A step of interposing a non-thermoplastic film which is not softened by heating in a predetermined shape at a predetermined position between the substrate and the surface of the base; heating and pressurizing the laminated metal base and the resin film, and pressing the resin film to a metal Heat-welding the surface of the substrate, cutting the resin film at a portion corresponding to the edge of the non-thermoplastic film, and removing the non-thermoplastic film and the resin film at the cut portion. Forming a non-laminated portion where the resin film is not welded on the surface of the metal substrate corresponding to the non-thermoplastic film. A method for producing a resin laminate, which is characterized in that: 2. The method according to claim 1, wherein in the step of heating and pressurizing the metal substrate and the resin film, the metal substrate is heated before the resin film is stacked on the metal substrate. A method for producing a metal resin laminate. 3. The production of a metal-resin laminate according to claim 1, wherein said metal substrate, resin film and non-thermoplastic film are strip-shaped and are supplied continuously. Method. 4. The method according to claim 1, wherein the non-thermoplastic film is paper. 5. The method according to claim 1, wherein the non-thermoplastic film is a metal foil. 6. The method according to claim 1, wherein a plurality of the non-thermoplastic films are stacked.