JP2009066855A - Method of forming long metal foil/resin film laminated sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forming method suitable for the formation of a thin long metal foil/resin film laminated sheet. <P>SOLUTION: The method of forming the laminated sheet is carried out by overlapping metallic foils and resin films in the number of sheets required to form the long metal foil 3a, 3b/resin film 4 laminated sheet and supplying between both drums of a heating and compression device comprising an upper side and a lower side drum 2a, 2b pivotally supported by a rotary shaft to be rotatable and passing through the heating and compression device to heat and compress. The heating and compression device is constituted so that the upper side and the lower side drums are capable of rocking, rotary rolls 8a, 8b for guiding the introduction of the metal foil and/or the resin film from the direction to become upper side or the lower side to the contact surface between the upper side and the lower side rolls in the heating and compression device are provided in the front of the drum and the rotary shaft of the rotary roll is connected to the rotary shaft of the upper side or the lower side drum to rock to be synchronized with the rocking of the drum is used and the metal foil and/or the resin film are supplied to the heating and compression device while being rocked in the width direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing one set or two or more sets of long metal foil / resin film laminated sheets. In particular, the present invention relates to a method capable of simultaneously producing two or more laminated sheets of a long copper foil and a long polyimide film.

  A laminated sheet obtained by laminating and bonding a resin film having high heat resistance and thermocompression bonding represented by an aromatic polyimide film and a highly conductive metal foil represented by copper foil is, for example, a printed wiring board of various electronic components. It is used for manufacturing. Typical configurations of this laminated sheet include a three-layer laminated sheet having a metal foil / resin film / metal foil configuration and a two-layer laminated sheet having a metal foil / resin film configuration.

  The laminated sheet as described above is generally produced as a long laminated sheet in consideration of the production efficiency of the laminated sheet itself and the production efficiency of various components such as a printed wiring board using the laminated sheet. Is. As a method for this purpose, each of the long resin films wound in a roll shape as well as the long metal foil wound in a roll shape can be continuously supported by a rotating shaft. A long shape that is supplied in a state of being superimposed on a pair of thermocompression bonding devices composed of an upper drum and a lower drum, or superimposed at the inlet of the thermocompression bonding device, and then laminated and crimped by the thermocompression bonding device A method of winding a laminated sheet with a winding roll is generally used. The thermocompression bonding equipment is a conventional type in which each of the upper drum and the lower drum is a single roll, and each of the upper drum and the lower drum is synchronized with the front drum and the rear drum, and the periphery of both drums is synchronized with the drum. A double belt press device composed of a rotating belt is representative.

  As described above, long metal foil / resin film laminated sheets are continuously manufactured using a thermocompression bonding apparatus. However, in response to an increase in demand for long metal foil / resin film laminated sheets in recent years. In order to reduce the manufacturing cost, it has been studied to simultaneously manufacture a plurality of elongated metal foil / resin film laminated sheets.

Patent Document 1 has a description of a method for stably producing a flexible metal foil laminate having a good appearance using a double belt press apparatus. In the description, a plurality of long metal foil / resin film laminates are described. There is a description that sheets can be produced simultaneously.
JP 2005-306002 A

  On the other hand, in response to the recent demand for miniaturization of various electronic components, there is a general trend of thinning the laminated sheet by thinning both the metal foil and the resin film constituting the laminated sheet.

  This inventor considered the trend of the demand of said thin film lamination sheet, and examined the technique which manufactures an elongate thin film lamination sheet using the conventional thermocompression bonding apparatus. As a result, the present inventor, in the thermocompression bonding operation using the conventionally employed thermocompression bonding apparatus, particularly when trying to produce a thin film laminated sheet, troubles such as folds and wrinkles occur in the long metal foil. I found it easy.

  That is, in the production of a long laminated sheet using a conventional thermocompression bonding apparatus, it is a constituent material of the laminated sheet in consideration of the fact that a high degree of planar uniformity is required for the intended long laminated sheet. Both the long metal foil and the long resin film were supplied to the thermocompression bonding apparatus in a state where high tension was applied. However, according to the inventor's research, it is estimated that this is due to a slight shift of the axial position (angle) between the unwinding roll of the long metal foil and the drum of the thermocompression bonding apparatus. A slight shift in the plane direction occurs when being taken into the crimping device, and this shift causes troubles such as breakage and wrinkles in the long metal foil and long resin film introduced. Cheap.

  Therefore, the present invention is likely to occur when a thin metal foil / resin film laminate sheet newly found this time is produced using a thermocompression bonding apparatus composed of an upper drum and a lower drum. The main object is to provide a method for producing a long metal foil / resin film laminate sheet that can avoid the occurrence of troubles such as the folding of the thin metal foil and the occurrence of wrinkles.

  In the present invention, the number of long metal foils and long resin films necessary for the production of one set or a plurality of long metal foil / resin film laminated sheets are respectively supported by rotation shafts. Supply in a state where it is overlapped between both drums of a thermocompression bonding apparatus comprising an upper drum and a lower drum where possible, and then apply a thermocompression bonding apparatus to the long metal foil and the long resin film in a superposed state. A method of producing a long metal foil / resin film laminated sheet by passing and thermocompression bonding, wherein the upper and lower drums are swingable as at least one of the thermocompression bonding devices. In front of the drum, the long metal foil and / or the long resin film is introduced from above or below the contact surface between the upper drum and the lower drum in the thermocompression bonding apparatus. Less to guide A heating roll provided with another guide rotary roll and connected to the rotary shaft of the upper drum or the lower drum so as to swing in synchronization with the swing of the drum. A long metal foil / resin film laminate sheet, characterized in that a long metal foil and / or a long resin film is supplied to a thermocompression bonding device while swinging in the width direction by using a crimping device. In the manufacturing method.

  By using the manufacturing method of the present invention, it is possible to avoid troubles such as breakage of a long metal foil or a long resin film or generation of wrinkles. The present invention is particularly advantageous for the production of laminated sheets each consisting of a thin long metal foil and a long resin film, and in particular, by using a known double belt press as the basic structure of a thermocompression bonding apparatus. It can be used advantageously. Further, the present invention can be advantageously used particularly when two or more long laminated sheets are simultaneously produced from a thin long copper foil and a thin long polyimide film.

Preferred embodiments of the invention will now be described.
(1) The guide rotary roll is a guide rotary roll that guides at least the long metal foil under rotation.
(2) The long metal foil and / or the long resin film introduced into the upper drum or the lower drum via the guide rotating roll has a holding angle (θ in FIG. 1) at the guide rotating roll. It is introduced at an angle in the range of 30-180 °.
(3) The long resin film is a long polyimide film.
(4) From the central layer made of an aromatic polyimide in which the glass transition point is not observed at less than 300 ° C., and the surface layer made of aromatic polyimide showing thermoplasticity disposed on both sides of the central layer It is a composite film.
(5) The long metal foil is a long copper foil.
(6) The laminated sheet is a three-layer laminated sheet having a configuration of metal foil / resin film / metal foil.
(7) The laminated sheet is a two-layer laminated sheet of metal foil / resin film.
(8) Two sets of long laminated sheets are manufactured simultaneously.
(9) Three sets of long laminated sheets are manufactured simultaneously.

  Next, the manufacturing method of the long metal foil / resin film laminate sheet according to the present invention uses a double-belt press-type thermocompression bonding apparatus that is preferably used, and a laminate sheet having a three-layer structure of copper foil / polyimide film / copper foil. A method of manufacturing the above will be described as a representative example.

  FIG. 1 is a schematic diagram showing a typical configuration of an apparatus advantageously used in the method for producing a long metal foil / resin film laminated sheet of the present invention.

  The manufacturing apparatus of FIG. 1 includes a pair of a thermocompression bonding apparatus composed of a rotatable upper drum 2a and a lower drum 2b supported by rotating shafts 1a and 1b, respectively, and a set provided in front of the thermocompression bonding apparatus. Alternatively, a plurality of unwinding rolls for supplying a plurality of long metal foils 3a and 3b and a long resin film 4 necessary for manufacturing a plurality of long metal foil / resin film laminated sheets to the thermocompression bonding apparatus. (Not shown), and one or a plurality of winding rolls 5 and 6 for winding each of a plurality of long metal foil / resin film laminated sheets generated after the thermocompression operation in the thermocompression bonding apparatus. An apparatus for producing a long metal foil / resin film laminated sheet including an upper drum 2a and a lower drum 2b of the thermocompression bonding apparatus, wherein at least one drum and the unwinding roll From the direction in which the long metal foils 3a and 3b or the long resin film 4 are above or below the contact surface 7 between the upper drum 2a and the lower drum 2b in the thermocompression bonding apparatus. And at least one guide rotary roll 8a, 8b for guiding the introduction of the drum, and the rotary shaft of the guide rotary roll 8a, 8b is connected to the rotary shaft 1a, 1b of the upper drum 2a or the lower drum 2b. It is connected to swing in synchronization with the swing.

  The long metal foil 3a has a holding angle (corresponding to [theta] in FIG. 1) of 30 to 180 [deg.], Preferably 45 to 180 [deg.] Through the guiding rotating roll 8a. Is introduced into the upper drum 2a at an angle in the range of 45 to 120 °, more preferably in the range of 45 to 120 °. The long metal foil 3b has a holding angle (corresponding to [theta] in FIG. 1) of 30 to 180 [deg.], Preferably 45 to 180 [deg.] On the guiding rotating roll via the guiding rotating roll 8b. Is introduced into the lower drum 2b at an angle in the range of 45 to 120 [deg.]. Similarly to the long metal foil, the long resin film has a holding angle (corresponding to θ in FIG. 1) in the range of 30 to 180 ° through the guide rotary roll, preferably 30 ° to 180 °. Can be introduced into the upper or lower drum at an angle in the range of 45-180 °, more preferably in the range of 45-120 °.

In FIG. 1, the guide rotating roll 13 for introducing the long resin film 4 is illustrated so as not to swing in synchronization with the swing of the drum. Similarly to the guide rotary roll 8a or the guide rotary roll 8b, the rotary roll 13 that swings in synchronization with the swing of the upper drum or the lower drum can be used. In particular, the holding angle (corresponding to θ in FIG. 1) of the long resin film 4 through the guide rotary roll 13 through the guide rotary roll 13 is in the range of 30 to 180 °, preferably 45 to 180 °. The effect is particularly excellent when it is introduced into the upper drum or the lower drum at an angle in the range of 45 to 120 °, more preferably in the range of 45 to 120 °.
In FIG. 1, the guide rotary roll is fixed by a shaft connected to the drum so as to swing in synchronism with the swing of the drum. However, the guide rotary roll is not connected to the drum but the drum swing. You may provide so that it may rock | fluctuate synchronizing with a motion.

  The basic configuration of the thermocompression bonding apparatus of FIG. 1 corresponds to a known double belt press, and a rear upper drum 9a and a rear lower drum 9b are provided at the rear of each of the upper drum 2a and the lower drum 2b. Endless belts 10a and 10b are mounted around the drum 2a and the rear upper drum 9a, and around the lower drum 2b and the rear lower drum 9b, respectively, and rotate endlessly in synchronization with the rotation of the drum. Between the upper drum 2a and the rear upper drum 9a (between the lower drum 2b and the rear lower drum 9b), a heating / pressurizing tool 11 and a pressure / cooling device 12 are provided.

  In FIG. 1, for example, the long metal foil 3a and the long metal foil 3b are both copper foils, and the long resin film 4 is a thermocompression-bonding multilayer aromatic polyimide film.

  Copper foil usually has electrolytic copper foil and rolled copper foil, and each is commercially available. Depending on the purpose, an electrolytic copper foil and a rolled copper foil of any thickness can be obtained from the manufacturer, and the laminate of the present invention can be obtained. Can be used for manufacturing.

  Moreover, metal foil is not limited to copper foil, Various metal foils (especially electroconductive metal foil), such as aluminum foil, can be used according to the objective. And as metal foil, such as copper foil, the metal foil which has thermocompression-bonding or adhesive resin coating layers, such as a polyimide and an epoxy resin, on the surface can be used. The metal foil having such a resin coating layer on the surface is usually used by being arranged so that the resin coating layer on the surface faces the resin film.

The thickness of the long metal foil is not particularly limited as long as it can be supplied to the thermocompression bonding apparatus, but is usually 5 to 35 μm, preferably 5 to 12 μm, and particularly preferably 5 to 10 μm. In the case of a metal foil having a carrier layer, the thickness of the metal foil is usually 1 to 7 μm. In particular, when copper foil is used, it is usually 8 to 35 μm for rolled copper foil, and usually 5 to 35 μm for electrolytic copper foil. In the case of a copper foil having a carrier layer, the thickness of the copper foil is usually 1 to 5 μm.
The width of the long metal foil is not particularly limited as long as it can be continuously conveyed. That is, the width may be any width that allows continuous thermocompression treatment by the thermocompression bonding apparatus to be used.

  The thermocompression bonding multilayer aromatic polyimide film is a film comprising a non-thermocompression bonding aromatic polyimide film and a thermocompression bonding aromatic polyimide layer formed on one or both surfaces thereof, for example, Ube Industries, Ltd. And is readily available. A detailed description of the thermocompression-bonding multilayer aromatic polyimide film can be found in the aforementioned Patent Document 1.

  In the description of FIG. 1, an example in which a thermocompression-bonding multilayer aromatic polyimide film is used as the resin film has been described. However, the resin film is particularly limited as long as it is a resin film that can be crimped to a metal foil under heating conditions. There is no. Resin films that can be used according to the purpose include thermocompression bonding aromatic polyimide film, thermocompression bonding polyester film, thermocompression bonding polyamide film (thermocompression bonding aramid film), thermocompression bonding vinyl ester film, heat Examples thereof include a pressure-sensitive fluororesin film. The resin film may be a single layer film or a multilayer film having a thermocompression bonding layer on one side or both sides. Particularly preferred are a thermocompression bonding aromatic polyimide film and a thermocompression bonding polyamide film (thermocompression bonding aramid film).

Although there will be no restriction | limiting in particular if the thickness of a resin film is the thickness which can be supplied to a thermocompression bonding apparatus, Usually, it is 5-150 micrometers, Preferably it is 8-100 micrometers, Most preferably, it is 10-50 micrometers.
It is preferable that the resin film has a thermocompression-bondable surface layer that can be thermocompression-bonded to the metal foil on one or both sides, and the thickness of the surface layer is usually 0.5 to 10 μm, preferably 1-8 μm, particularly preferably 1-5 μm.
The width of the long resin film is not particularly limited as long as it can be continuously conveyed. That is, the width may be any width that allows continuous thermocompression treatment by the thermocompression bonding apparatus to be used.

  Next, the manufacturing method of the elongate metal foil / resin film lamination sheet using the thermocompression bonding apparatus of FIG. 1 is the same as the manufacturing method of the lamination sheet consisting of three layers of elongate metal foil / resin film / elongation metal foil. An example will be described in detail.

  Since the laminated sheet for manufacturing is a laminated sheet composed of three layers of long metal foil / resin film / long metal foil, first, the long metal foil 3a, the resin film 4 and the long metal foil 3b is unwound from each unwinding roll (not shown). The long metal foil 3a and the long metal foil 3b are arranged between the upper drum 2a and the lower drum 2b (in the case of a double belt press, the upper endless belt 10a and the lower endless belt 10b Between the guide rolls 8a and 8b. On the other hand, the resin film 4 is also guided to the guide rotary roll 13 not connected to the drum and introduced into the slit, and from this slit, the three layers of long metal foil / resin film / long metal foil are used. A laminated structure is formed. The laminated structure advances with the rotation of the endless belts 10a and 10b, and is subjected to a thermocompression treatment while moving forward, so that three layers of long metal foil / resin film / long metal foil are formed. It becomes an integrated laminated sheet, and is then wound on winding rolls 5 and 6.

When the long metal foil / resin film laminated sheet is manufactured using the thermocompression bonding apparatus, a guide rotating roll for introducing the long metal foil and / or the long resin film into the drum is synchronized with the drum. In the length direction or the width direction of the long metal foil and / or the long resin film between the part introduced between the upper drum and the lower drum and the guide rotating roll. Since the tension is less likely to be uneven, it is possible to obtain an excellent effect that troubles such as breakage of the long metal foil and / or long resin film and occurrence of wrinkles can be effectively avoided.
In the present invention, the long metal foil and / or the long resin film has a holding angle (θ) in the guide rotary roll through the guide rotary roll in the range of 30 to 180 °, preferably It is particularly effective when it is introduced into the upper drum or the lower drum at an angle in the range of 45 to 180 °, more preferably in the range of 45 to 120 °, and the holding angle (θ ) Can be preheated by the entrance drum.

  In addition, in FIG. 1, although the manufacturing apparatus of the elongate laminated body was demonstrated as an apparatus using a double belt press, the manufacturing apparatus of an elongate laminated body is a thermocompression bonding apparatus including an upper drum and a lower drum. It can of course be carried out in the same manner by using a known thermocompression bonding apparatus including (especially a thermocompression bonding apparatus using a drum whose surface is made of an elastic material) or a modification or improvement of a known thermocompression bonding apparatus. It is. Moreover, the long laminated body to manufacture is not restricted to one set, Two sets, three sets, or four sets can be manufactured simultaneously.

The typical structure of the manufacturing apparatus which can be utilized for the manufacturing method of the elongate metal foil / resin film lamination sheet of this invention is shown.

Explanation of symbols

1a, 1b Rotating shaft 2a Upper drum 2b Lower drum 3a, 3b Long metal foil 4 Long resin film 5, 6 Winding roll 7 Contact surface between upper drum 2a and lower drum 2b 8a, 8b For guidance Rotating roll 9a Rear upper drum 9b Rear lower drum 10a, 10b Endless belt 11 Heating and pressing tool 12 Pressure cooling device 13 Rotating roll for guidance

Claims (6)

A rotatable upper drum in which one or a plurality of long metal foil / resin film laminated sheets, each of which is necessary for manufacturing a long sheet of metal foil and a long resin film, is supported by a rotating shaft. Is supplied in a state of being overlapped between the two drums of the thermocompression bonding device comprising the upper and lower drums, and then the superposed metal foil and the long resin film are passed through the thermocompression bonding device and heated. A method of manufacturing a long metal foil / resin film laminated sheet by pressure bonding, wherein the upper and lower drums are swingable as the thermocompression bonding device, and at the front of at least one drum In addition, at least one for guiding the introduction of the long metal foil and / or the long resin film from the direction above or below the contact surface between the upper drum and the lower drum in the thermocompression bonding apparatus. Horn A thermocompression bonding apparatus provided with an inner rotary roll and connected so that the rotary shaft of the guide rotary roll swings in synchronization with the swing of the drum on the rotary shaft of the upper drum or the lower drum; A method for producing a long metal foil / resin film laminate sheet, characterized in that the long metal foil and / or the long resin film is supplied to a thermocompression bonding apparatus while being swung in the width direction. The manufacturing method according to claim 1, wherein the guide rotary roll is a guide rotary roll that guides at least the long metal foil under rotation. The long metal foil and / or long resin film introduced into the upper drum or the lower drum via the guide rotating roll has a holding angle (θ) of 30 to 180 ° at the guiding rotating roll. The manufacturing method according to claim 1 or 2, which is introduced at an angle of. The manufacturing method according to claim 1, wherein the thermocompression bonding apparatus is a double belt press. The manufacturing method according to claim 1, wherein the long metal foil is a long copper foil. The manufacturing method according to any one of claims 1 to 5, wherein the long resin film is a long polyimide film.

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