JP3182457B2 - 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 capable of accurately laminating the above resin film 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.

However, in the latter method, it is difficult to accurately place the resin film on a stainless steel strip because the resin film is soft, and the edge of the resin film is made of stainless steel. The edge of the resin film protrudes from the edge of the strip, and conversely, the edge of the resin film is deviated from the edge of the stainless steel strip toward the center, and a portion where the resin film is not laminated is formed on the edge of the metal base. Or be done. For this reason, conventionally, a stainless steel strip and a resin film having a width larger than the width of the strip as a final product are laminated and laminated, and the 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 the disadvantages that the number of steps is increased, and both side edges of the stainless steel strip and the resin film are wasted, thereby increasing the manufacturing cost.

[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 on a metal substrate, and it is easy to manufacture and reduce the cost. It is intended to provide a method for producing a metal resin laminate which can be produced.

[0008]

According to the present invention, a resin film such as a hot-melt adhesive is laminated on the surface of a metal substrate such as a stainless steel thin plate or the like so as to protrude laterally from the edge thereof. The heated metal substrate and the resin film are heated and a region including the edge portion of the metal substrate is pressed by a roll. Then, a portion of the resin film protruding laterally from the edge of the metal base is cut and removed from a cut 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 pressing. The resin film extends beyond the edge of the metal substrate to the outside thereof, and is pressed to the edge of the metal substrate during pressing. The corresponding portion 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 in a portion of the resin film corresponding to the edge of the metal base. This cutting part varies depending on conditions such as pressurization and heating, thickness and material of the resin film, etc., but is completely cut at this part simultaneously with the above-mentioned pressurization, or easily cut with a small external force. Part. Moreover, this cut portion has a very sharp and smooth cut surface. Therefore, if the resin film outside the cut portion is removed, the resin film can be completely and accurately welded to the edge of the metal base. Therefore, it is not necessary to cut the edge of the metal base for finishing, and there is no waste of material. Further, the method of the present invention can be carried out with a small-scale facility similarly to the conventional method, and the production cost can be reduced.

[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 in which a resin film of a hot melt resin is thermally welded to the entire surface of a thin strip of stainless steel.

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 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.

The superposed metal strip 1 and resin film 2 pass between a pair of composite rolls 5 and are pressed by a predetermined pressure by these composite rolls 5 as shown in FIG. You. The width of these composite rolls 5 is wider than the width of the above-mentioned metal strip 1, and therefore
The entire portion of the resin film 2 including both side edges of the metal strip 1 is pressed by these composite rolls 5.

When 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, portions of the resin film 2 corresponding to both side edges of the metal strip 1 are provided.
Is formed with a cut portion A. 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 inside of the resin film 2,
Further, the resin film 2 is heated and softened by the pre-heated metal strip 1, causing a material flow or the like in the resin film 2. However, since both side edges of the resin film 2 protrude from both side edges of the metal strip 1, no compressive force is applied to the protruding portion 2 '. There is no flow. Therefore, the stress generated in the resin film 2, the flow of the material, and the like are different with respect to the portions corresponding to both side edges of the metal strip 1 as a boundary. The physical properties of the material of the resin film 2 change. Therefore, this resin film 2
Are cut portions A at portions corresponding to both side edges of the metal strip 1.
Is formed, and this cut portion A is completely cut by pressurization by the composite roll 5 or easily cut from this cut portion A by applying only a small force from the outside. Things.

In the above embodiment, the metal strip 1 is heated by the preheating device 4 and then the resin film 2 is heated.
When these are pressed by the composite roll 5, only the portion of the resin film 2 that is overlapped with the metal strip 1 is heated, and the portions protruding from both side edges of the metal strip 1 are heated. Not done. Therefore, the state of heating at the cut portion A corresponding to both side edges of the metal strip 1 is also discontinuous, and the change in physical properties at the cut portion A becomes large, so that the cut at the cut portion A becomes more reliable. Also, portions 2 of the resin film 2 protruding on both sides of the metal strip 1.
Since 'is not heated, this portion 2' can be reused. When such a resin film 2 is welded to both side surfaces of the metal strip 1, these portions 2 '
Are not thermally welded to each other, and these can be reused.

As described above, the metal strip 1 and the resin film 2 that 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 winding roll 8. It is wound up and this part 2 'is removed as shown in FIG.

Then, the metal resin laminate 12 thus laminated is heated by the post-heating device 9, more reliably welded, cooled by the cooling device 10, and coiled by the laminate winding device 11. It is wound up.

According to such a method, even if the resin film 2 overlaid on the metal strip 1 is slightly shifted in the width direction, the resin film 2 can be reliably removed over the entire width of the metal strip 1. Can be laminated. Further, at the time of pressurization, the resin film 2 is cut from a cut portion A corresponding to the edge of the metal strip 1, and the cut surface is sharp and smooth. Therefore, the laminate 12 is a product completely welded to the edge with the resin film, and it is not necessary to cut both side edges of the laminate 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:
Naturally, it changes according to the material and thickness of the metal strip 1 and the resin film 2 to be used. For example, as the metal strip 1 described above, a 150 mm wide and 0.2 mm thick S
These were laminated using a strip of US430 stainless steel and 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 preheating device 4 is 130 ° C., and when the resin film 2 is superposed thereon and pressed by the composite roll 5, 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. Further, the temperature of the post-heating by the post-heating device 9 after the lamination is 150 ° C.

Under these conditions, the metal strip 1
When the resin film was bonded to the resin film, they were completely thermally welded to obtain an integrated metal resin laminate 12. In this state, the edge portions 2 ′ on both sides of the resin film 2.
Was completely cut from the cutting portion A after passing through the composite roll 5, and was taken up by the take-up roll 8.

In order to cut the resin film 2 at the edge of the metal strip 1 by pressurizing the composite roll 5, it is preferable to control the temperature and pressure during this pressurization to 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 is the resin film 2 not 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 where the above-described metal resin laminate is manufactured, but can also be used to manufacture other forms of the metal resin laminate.

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

That is, in this embodiment, the width of the resin film 2 is smaller than the width of the metal strip 1, and one edge of the resin film 2 is formed at one edge of the metal strip 1. 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.
Are superimposed 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, and the other edge of the resin film 2 is One is protruded outward from the other edge. 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 on the metal strip 1 and laminated. Further, at the time of this pressurization, as in the case of the first embodiment, this metal strip 1
A cut portion A of the resin film 2 is formed at a position corresponding to the other edge of the resin film 2. As shown in FIG. 10, the protruding portion 2 'of the edge of the resin film 2 is cut from the cut portion. And removed.

Also, by combining the methods as described in the first and second embodiments, various types of metal resin laminates can be manufactured. For example, as shown in FIG. 11, the resin film 2 is laminated on only 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 provided with the first film. As in the embodiment, a product in which the resin film 2 is welded to the entire surface can be manufactured.

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 face of the metal strip 1 are provided. As in the second embodiment, the resin films 2 may be laminated on the edge portions, and a portion where the resin film is not laminated may be formed only at the center of the lower surface of the metal strip 1.

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

FIGS. 15 to 17 show a third embodiment of the present invention. In this method, 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 the 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 in the same plane so that they are parallel to each other and their adjacent edges are in close contact with each other. Then, one resin film 2 is stacked on these metal strips, and the resin film 2 is thermally welded to the metal strips 1a, 1b, 1c, 1d by heating and pressing. At the same time, cut portions are formed in the resin film 2 at 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 to the entire surface of each is manufactured.

FIG. 17 shows an apparatus for manufacturing such a product. This device has basically the same configuration as the above-described device, but has winding rolls 8 for winding the cut both side edges of the resin film 2 separately provided on the upper and lower sides. 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 on which the resin films are laminated are alternately vertically separated, that is, the metal strips 1a and 1c are provided on upper guide rollers, and the metal strips 1b and 1d are provided on lower guide rollers. You will be guided. Therefore, as shown in FIG. 16, the adjacent metal strips move in different directions vertically, and the resin film 2 is reliably cut at these edges.

The resin film 2 can be cut more reliably 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 close contact with each other, the resin film is sufficiently thin. Can be cut.

The present invention is not limited to the above embodiment. For example, 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-mentioned ones, and various resins can be used as long as they can be thermally welded.

For example, as the material of the metal substrate, 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, a polyolefin-based material, a polyester-based material,
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.

In the present invention, the thickness of the above-mentioned metal substrate or resin film is not essential. However, in the apparatus and method of the above-described embodiment, the thickness of the metal substrate, that is, the metal strip can be applied to a thickness of 0.03 to 3.0 mm, but the thickness is 0.05 to 1.0 mm. It is preferred that

In the above embodiment, the thickness of the resin film is 0.03 to 1.0 mm, preferably 0.03 to 1.0 mm.
The range is 0.1 mm. The conditions of the heat welding by heating and pressurizing differ, of course, 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.

[0038]

As described above, according to the present invention, a resin film laminated on a metal substrate can be cut sharply and smoothly at the edge of the metal substrate. Therefore, the resin film can be completely laminated up to the edge of the metal substrate, and it is not necessary to cut the edge of the metal substrate for finishing. Therefore, there is no waste of materials,
Further, the process is simple, 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 laminating 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 a schematic side view of an apparatus used in a second embodiment of the present invention.

FIG. 7 is a schematic plan view of the device of FIG. 6;

FIG. 8 is an explanatory view of a step of laminating a resin film on a metal strip by the method of the second embodiment.

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

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

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

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

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

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

FIG. 15 is an explanatory view of an overlapping step of the method according to the third embodiment of the present invention.

FIG. 16 is an explanatory view 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 a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal strip board 2 ... Resin film 2 '... Side edge part 4 ... Preheating apparatus 5 ... Composite roll 6 ... Resin film supply roll

────────────────────────────────────────────────── (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 (5)

(57) [Claims] 1. A method of manufacturing a metal-resin laminate by thermally welding a resin film to a metal substrate, the method comprising: projecting laterally from an edge of the surface of the metal substrate to stack the resin film. The stacked metal substrate and the resin film are heated and pressed by a roll including the edge of the metal substrate, and the resin film is thermally welded to the surface of the metal substrate. Forming a cut portion having changed physical properties in the portion of the resin film thus obtained, and cutting and removing the portion of the resin film protruding laterally from the edge of the metal base from the cut portion. A method for producing a metal resin laminate, comprising the steps of: 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 metal substrate is a band-shaped metal sheet, and the resin film is a band-shaped sheet. The width of the band-shaped resin film is wider than the width of the band-shaped metal sheet. Heating and pressing the resin film so that both sides protrude from both sides of the metal sheet, heat-sealing them, and cutting and removing the resin film projecting from both sides of the metal sheet. The method for producing a metal resin laminate according to claim 1, wherein: 4. The metal substrate is a band-shaped metal sheet, and the resin film is a band-shaped metal sheet. One side edge of the resin film is separated from one side edge of the metal sheet. The other side edge of the strip-shaped resin film is projected on the strip-shaped metal sheet, and heated and pressed to expose a part of the metal sheet in the width direction. 2. The method for manufacturing a metal resin laminate according to claim 1, further comprising cutting and removing a portion of the resin film protruding from one side edge of the thin metal plate while performing heat welding. 5. A plurality of separate metal bases are arranged adjacent to each other, and the resin film is superposed on the plurality of metal bases, and heated and pressed to be thermally welded. 2. The method according to claim 1, wherein said resin film is cut at each edge of said plurality of metal substrates.