JP5165218B2 - Manufacturing method of long laminate of metal foil / resin film / metal foil structure - Google Patents

Description

  The present invention relates to a method for simultaneously producing a long laminate having a structure comprising a plurality of sets of metal foil / resin film / metal foil.

  A laminated body obtained by laminating a highly heat-resistant and heat-bondable resin film typified by an aromatic polyimide film and a highly conductive metal foil typified by a copper foil is, for example, a printed wiring board for various electronic components. It is used for manufacturing. Typical configurations of this laminate include a three-layer laminate having a metal foil / resin film / metal foil configuration and a two-layer laminate having a metal foil / resin film configuration. In the present specification, these three-layer laminate and two-layer laminate are collectively referred to as a metal foil / resin film laminate.

  The metal foil / resin film laminate as described above is a long laminate in consideration of the production efficiency of the laminate itself and the production efficiency of various parts such as a printed wiring board using the laminate. It is common to manufacture. As a method for this, each of the long resin film wound in the roll shape as well as the long metal foil wound in the roll shape is continuously paired with the upper roll and the lower roll. To the thermocompression bonding apparatus in a state where they are superposed on each other or overlapped at the inlet of the thermocompression bonding apparatus, and then take up a long laminate laminated and crimped by the thermocompression bonding apparatus. The method of winding is generally used. As the thermocompression bonding apparatus, a conventional thermocompression bonding apparatus in which each of the upper roll and the lower roll is a single roll, and each of the upper drum and the lower drum is a front drum and a rear drum, and the periphery of both drums is a drum. A double belt press composed of belts that rotate synchronously is typical.

  As described above, the long metal foil / resin film laminate is continuously manufactured using a thermocompression bonding apparatus, but in recent years, a long three-layer structure composed of metal foil / resin film / metal foil is used. In response to an increase in the demand for laminates, and in order to reduce the production cost, it is considered to produce two or more sets of laminates simultaneously.

  In Patent Document 1, two or more sets of a thermocompression-bonding multilayer polyimide film and a metal foil are supplied to a double belt press apparatus, and the multilayer polyimide film and the metal foil are obtained by performing thermocompression bonding and cooling under pressure. A method is described in which two or more sets of flexible metal foil laminates are manufactured by bonding together.

In Patent Document 2, there is 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 the body can be manufactured simultaneously. There is also a description of a specific configuration of the double belt press device.
JP 2001-270039 A 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 reducing the thickness of the laminated body by thinning both the metal foil and the resin film constituting the laminated body.

  The present inventor considers the trend of recent demand for the above-mentioned thin film laminate, and uses a thermocompression bonding apparatus that has been used so far, and has a long structure composed of a plurality of metal foils / resin films / metal foils A technique for simultaneously producing a scale-like three-layer laminate was studied.

  In the course of the study, the present inventor made a thermocompression bonding when a plurality of long laminates having a three-layer structure of metal foil / resin film / metal foil were simultaneously manufactured using a general thermocompression bonding apparatus. Separation (separation) failure due to biting between metal foils adjacent to each other during the operation, especially rolled copper foils in the vicinity of each side end portion occurred, and each set of long laminates It has been found that a phenomenon that makes it difficult to separate from each other occurs.

Next, the result of the above examination by the inventor will be described with reference to FIG. 1 of the accompanying drawings.
FIG. 1 shows an upper side of a double belt press appearing in the process of simultaneously producing two sets of three layers of metal foil / resin film / metal foil using a double belt press which is an example of a thermocompression bonding apparatus. Belt and lower belt (the construction of a double belt press is known and will be described in detail later in this specification), and a long laminate of two layers of metal foil / resin film / metal foil laminated to each other It is a schematic diagram which shows the layer structure along the width direction of a body. That is, FIG. 1 shows an upper elongate laminate 4a having a three-layer structure of a metal foil 1a, a resin film 2a, and a metal foil 3a, a metal foil 1b, a resin film 2b, and a three-layer structure of a metal foil 3b. A state is shown in which a laminated body is formed by superimposing the side elongate laminated body 4b, and the upper and lower sides thereof are sandwiched between an upper belt 5a and a lower belt 5b of a double belt press (not shown). This laminate structure is maintained until the metal foil and the resin sheet are heated and pressure-bonded by a double belt press, cooled, and then separated from each other for each long laminate.

  FIG. 1 shows the basic structure of a laminate in which a metal foil and a resin sheet are heat-pressed by a double belt press. At the position of the resin film side end, a strong local pressure is applied to each laminate, and the local strong pressure is in contact with each other at the central portion, and the lower metal of the upper laminate in an overlapped state. It has been found that biting occurs between the foil 3a and the upper metal foil 1b of the lower laminate.

  Based on the above findings, as a result of further investigation, the inventor performed the thermocompression bonding operation by slightly shifting the positions of the side end portions in the width direction of the respective resin films of the adjacent groups, The lower metal foil of the upper laminated body and the upper metal of the lower laminated body that are in contact with each other and are overlapped by performing in a state where the side end portions of the resin film are arranged so as not to overlap It has been found that biting between the foils can be avoided. This preferable phenomenon is that, when the thermocompression operation is performed in a state where the positions of the side edges of the resin film do not overlap, the pressure applied locally between the metal foils is dispersed, and the pressure applied to each laminate is reduced. It is understood that this is due to the mitigation of non-uniformity.

  Accordingly, the present invention provides a thermocompression bonding apparatus and a plurality of elongated shapes necessary for manufacturing a long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil provided in front of the thermocompression bonding apparatus. A plurality of unwinding rolls for supplying a metal foil and a plurality of long resin films to the thermocompression bonding apparatus, and a plurality of sets of metal foil / resin film / metal foil generated after completion of the thermocompression operation in the thermocompression bonding apparatus A long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil using a laminate manufacturing apparatus comprising a plurality of winding rolls each winding a long laminate having a structure composed of In the method of simultaneously manufacturing, the above-described thermocompression bonding operation is carried out in a state where the positions of the side end portions of the respective resin films in the set adjacent to each other in the thickness direction are not overlapped. It is inIn addition, as a method of arranging so that the positions of the side end portions of the respective resin films in the set adjacent to each other in the thickness direction do not overlap, preferably, the positions in the width direction of the respective resin films in the set adjacent to each other It is possible to use a method of shifting the positions from each other.

  Thermocompression bonding apparatus, a plurality of long metal foils and a plurality of lengths necessary for manufacturing a long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil provided in front of the thermocompression bonding apparatus A plurality of unwinding rolls for supplying a scale-like resin film to the thermocompression bonding apparatus, and a long structure having a structure comprising a plurality of sets of metal foil / resin film / metal foil generated after completion of the thermocompression operation in the thermocompression bonding apparatus In a method for simultaneously producing a long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil, using a laminate production apparatus comprising a plurality of winding rolls for winding up each of the laminated laminates By using the improved method of the present invention, it is possible to avoid the occurrence of biting between the lower metal foil of the upper laminate and the upper metal foil of the lower laminate in contact with each other and stacked, Separation between stacked stacks Easy to. The present invention is particularly effective when both adjacent metal foils are rolled copper foils.

Preferred embodiments of the invention will now be described.
(1) The shift of the position of the side end portion of each resin film in the set adjacent to each other in the thickness direction is expressed as a relative distance between the side end portion of one resin film and the side end portion of the other resin film. It exists in the range of 5-5 mm (more preferably 1-3 mm).
(2) Two long laminates having a structure of metal foil / resin film / metal foil manufactured simultaneously.
(3) The metal foils arranged adjacent to each other in a plurality of sets of laminated bodies are both rolled copper foils.
(4) The long resin film is a long aromatic polyimide film.
(5) The long resin film is a long thermocompression-bonding multilayer polyimide film including a non-thermocompression-bonding aromatic polyimide film and thermocompression-bonding aromatic polyimide layers formed on both side surfaces thereof.
(6) The thermocompression bonding apparatus is a double belt press.

  Next, the manufacturing method of the elongate laminated body of multiple sets of metal foil / resin film / metal foil structure of this invention is demonstrated, referring FIG. 2 of an accompanying drawing. In addition, in FIG. 2, the method of manufacturing two sets of elongate laminated bodies of metal foil / resin film / metal foil structure simultaneously using copper foil as metal foil is demonstrated as a representative example.

  FIG. 2 is a drawing for explaining a case where a method for producing a long laminate having a structure composed of a plurality of sets of copper foil / resin film / copper foil is carried out using a known double belt press. That is, FIG. 2 shows a method of simultaneously and continuously producing two pairs of long laminates composed of copper foil / resin film / copper foil using a double belt press.

  In FIG. 2, a double belt press 11 includes a pair of front upper drum 12a and front lower drum 12b, a pair of rear upper drum 13a and rear lower drum 13b, and a set of two upper drums and two upper drums. It comprises belts 14a and 14b stretched around each of the lower drum sets. In the double belt press 11 of FIG. 2, the two front drums 12a and 12b are heating drums, and the two rear drums 13a and 13b are cooling drums. This heating and pressurizing apparatus is composed of heating and pressing tools 15a and 15b provided at the upper and lower sides, and the upper and lower sides of the laminated body conveyed between the upper and lower belts 14a and 14b in the double belt press. The heating and pressurizing tools 15a and 15b are configured to apply pressure when approaching each other. Further, in the double belt press of FIG. 2, pressure cooling devices 16a and 16b are provided at the rear of the pressure device so as to cool the laminate subjected to the pressure treatment at a high temperature.

  In front of the double belt press 11, an upper copper foil 21a, a resin film 22a, and a lower copper foil 23a for manufacturing a long laminate of a copper foil / resin film / copper foil configuration are respectively provided. The upper copper foil roll 31a, the resin film roll 32a, and the lower copper foil roll 33a which are wound are arranged, and a long laminate having a further set of copper foil / resin film / copper foil configuration is manufactured. The upper copper foil roll 31b, the resin film roll 32b, and the lower copper foil roll 33b around which the upper copper foil 21b, the resin film 22b, and the lower copper foil 23b are wound are disposed.

  Behind the double belt press 11, a take-up roll 51a for winding up the long laminate 41a having a set of manufactured copper foil / resin film / copper foil is disposed via an auxiliary roll 52a. In addition, a winding roll 51b for winding up the long laminate 41b having another set of manufactured copper foil / resin film / copper foil is disposed via an auxiliary roll 52b.

  In FIG. 2, for example, both the copper foil 21a and the copper foil 23a are electrolytic copper foils, the resin film 22a is a thermocompression-bonding multilayer aromatic polyimide film, and both the copper foil 21b and the copper foil 23b are rolled. It is copper foil, Comprising: Let the resin film 22b be a thermocompression-bonding multilayer aromatic polyimide film. That is, the copper foil of 23a and the copper foil of 21b can be combined such that one copper foil is an electrolytic copper foil and the other copper foil is a rolled copper foil. By such a combination, there is an advantage that the occurrence of biting between the copper foil of 23a and the copper foil of 21b can be reduced. Alternatively, it is also advantageous to use all of the copper foil, that is, the copper foil 21a, the copper foil 23a, the copper foil 21b, and the copper foil 23b as a rolled copper foil. However, such a specific combination arrangement of metal foils is not essential in the production method of the present invention.

  Both the electrolytic copper foil and the rolled copper foil are commercially available, and an electrolytic copper foil and a rolled copper foil of any thickness can be obtained from the manufacturer according to the purpose and used for the production of the laminate of the present invention.

  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. As the metal foil such as copper foil, a metal foil having a thermocompression-bonding or adhesive resin coating layer such as polyimide or 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 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 regarding FIG. 2, an example in which a thermocompression-bonding multilayer aromatic polyimide film is used as the resin film has been described, but 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. Examples of the resin film that can be used according to the purpose include a single-layer thermocompression bonding aromatic polyimide film, a thermocompression bonding polyester film, a thermocompression bonding vinyl ester film, and a thermocompression bonding fluororesin film. it can.

  Next, a method for producing the long laminate of the present invention using the double belt press shown in FIG. 2 will be described.

  The long resin films 22a and 22b and the long copper foils 21a, 23a, 21b, and 23b are unwound from the respective rolls, and the belts 14a and 12b are interposed between the pair of front heating drums 12a and 12b of the double belt press 11. 14b. The resin film and the copper foil are stacked and heated by the front drums 12a and 12b, and are conveyed toward the rear drums 13a and 13b as they are sandwiched between the belts 14a and 14b, in a vertical relationship. Is done. And in the middle of the conveyance, a thermocompression-bonding process is performed by the heating and pressurizing tools 15a and 15b, and then it is cooled by the pressurizing and cooling devices 16a and 16b. The laminated body is further conveyed rearward, and after passing through the rear drums 13a and 13b, at the position of the auxiliary roll 52b, the upper elongated laminated body 41a (copper foil 21a / resin film 22a / copper foil 23a has a configuration. Laminate) and lower elongated laminate 41b (a laminate having a configuration of copper foil 21b / resin film 22b / copper foil 23b).

  The structure of the laminated body of the upper elongate laminated body 41a and the lower elongate laminated body 41b before being separated is shown in FIG. This laminated body is laminated | stacked in the state which the rolled copper foil 23a and the rolled copper foil 21b contacted.

  The upper elongate laminate 41a is then wound around a winding roll 51a via an auxiliary roll 52a. Similarly, the lower elongate laminated body 41b is then wound around the winding roll 51b via the auxiliary roll 52b.

  In addition, regarding the various forms and improvements of the double belt press in the production of multiple sets of long copper foil / resin film laminate using a double belt press, and the production conditions of the laminate using the double belt press, The descriptions of Patent Document 1 and Patent Document 2 described above can be referred to.

  Next, the lamination conditions in the width direction (direction perpendicular to the length direction of the long sheet) of the long metal foil and the long resin film, which are characteristic requirements of the present invention, are described with reference to FIG. explain.

FIG. 3 shows a laminate of the present invention formed by laminating two pairs of long laminates composed of copper foil / resin film / copper foil described in FIG. 2 (that is, two sets of long shapes). It is a schematic diagram which shows the structure according to the laminated structure which appears before a laminated body isolate | separates from each other. That is, the laminate is an upper laminate 41a composed of an upper copper foil 21a, a resin film 22a, and a lower copper foil 23a, and a lower laminate composed of an upper copper foil 21b, a resin film 22b, and a lower copper foil 23b. It is comprised from the two sets of laminated bodies of the body 41b. And the resin film 22a of the upper laminated body 41a and the resin film 22b of the lower laminated body 41b are shifted from each other in the width direction so that the positions of the side end portions of the respective resin films do not overlap. It is in the state of arrangement. The shift distance between the side end of the resin film 22a and the end of the resin film 22b (the shift in the position in the width direction of each resin film in the set adjacent to each other is determined by the side end of one resin film and the other resin. The relative distance to the side edge of the film is preferably in the range of 0.5 to 5 mm, particularly preferably in the range of 1 to 3 mm.

  Next, the structure of the laminated body according to the present invention in the case where three sets of long laminated bodies having a structure of copper foil / resin film / copper foil are simultaneously and continuously manufactured will be described with reference to FIG.

  FIG. 4 is a schematic diagram showing a configuration of a laminate in which two sets of long laminates described in FIG. 3 are laminated and a pair of long laminates are further laminated on the lower side. FIG. That is, the laminated body of FIG. 4 consists of the upper laminated body 41a which consists of upper copper foil 21a, resin film 22a, and lower copper foil 23a, upper copper foil 21b, resin film 22b, and lower copper foil 23b. The intermediate laminated body 41b is constituted by three sets of laminated bodies including a lower laminated body 41c including an upper copper foil 21c, a resin film 22c, and a lower copper foil 23c. And the resin film 22a of the upper laminated body 41a, the resin film 22b of the intermediate laminated body 41b, and the resin film 22c of the lower laminated body 41c are shifted from each other in the width direction, and the respective resin films It exists in the state arrange | positioned so that the position of a side edge part may not overlap. However, the position in the width direction is not necessarily shifted in the relationship between the resin film 22a and the resin film 22c. The shift distance between the side end of the resin film 22a and the end of the resin film 22b (the shift in the position in the width direction of each resin film in the set adjacent to each other is determined by the side end of one resin film and the other resin. The relative distance between the side edge of the film) and the distance between the side edge of the resin film 22b and the edge of the resin film 22c is preferably in the range of 0.5 to 5 mm, preferably 1 to 3 mm. It is especially preferable that it is in the range.

  In FIG. 4 above, the resin film 22b is arranged on the left side of the resin film 22a, and then the resin film 22c is arranged on the further left side of the resin film 22b. A zigzag type arrangement in which the resin film 22b is arranged on the right side of the resin film 22a and then the resin film 22c is arranged on the left side of the resin film 22b can be used instead of the arrangement.

  In addition, in FIG. 2, although the manufacturing method of the elongate laminated body of this invention was demonstrated as a method using a double belt press, the manufacturing method of the elongate laminated body of this invention includes an upper side roll, a lower side roll, Similarly, using a known thermocompression bonding device including a pair of thermocompression bonding devices (particularly a thermocompression bonding device using a roll whose surface is made of an elastic material), or a thermocompression bonding device comprising a modification or improvement of a known thermocompression bonding device Of course, it can be implemented. Moreover, the long laminated body manufactured simultaneously is not restricted to 2 sets, The simultaneous manufacture of 3 sets or 4 sets is also possible.

The upper belt and the lower belt of the double belt press appearing in the process of manufacturing two sets of a three-layer structure of metal foil / resin film / metal foil at the same time using a double belt press, and laminated to each other It is a schematic diagram which shows the layer structure along the width direction of the elongate laminated body of a three-layer structure of two sets of metal foil / resin film / metal foil. It is a figure for demonstrating the manufacturing method of the elongate laminated body of multiple sets of metal foil / resin film / metal foil structure of this invention. It is a schematic diagram which shows the structure according to the laminated body of this invention formed by laminating | stacking two sets of the elongate laminated body demonstrated in FIG. It is a schematic diagram which shows the structure according to the laminated body of this invention formed by laminating | stacking 3 sets of elongate laminated bodies.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Metal foil 1b Metal foil 2a Resin film 2b Resin film 3a Metal foil 3b Metal foil 4a Long laminate 4b Long laminate 5a Belt 5b Belt 11 Double belt press 12a Front upper drum 12b Front lower drum 13a Back upper Drum 13b Rear lower drum 15a Heating pressure tool 15b Heating pressure tool 16a Pressure cooling device 16b Pressure cooling device 21a Copper foil 21b Copper foil 21c Copper foil 22a Resin film (thermocompression-bonding multilayer aromatic polyimide film)
22b Resin film (Thermo-compressible multilayer aromatic polyimide film)
22c Resin film (Thermo-compressible multilayer aromatic polyimide film)
23a Copper foil 23b Copper foil 23c Copper foil 31a Copper foil unwinding roll 31b Copper foil unwinding roll 32a Resin film unwinding roll 32b Resin film unwinding roll 33a Copper foil unwinding roll 33b Copper foil unwinding roll 41a Long laminating Body 41b Long Laminate 41c Long Laminate 51a Winding Roll 51b Winding Roll 52a Auxiliary Roll 52b Auxiliary Roll

Claims (7)

  Thermocompression bonding apparatus, a plurality of long metal foils and a plurality of lengths necessary for manufacturing a long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil provided in front of the thermocompression bonding apparatus A plurality of unwinding rolls for supplying a scale-like resin film to the thermocompression bonding apparatus, and a long structure having a structure comprising a plurality of sets of metal foil / resin film / metal foil generated after completion of the thermocompression operation in the thermocompression bonding apparatus In a method for simultaneously producing a long laminate having a structure composed of a plurality of sets of metal foil / resin film / metal foil, using a laminate production apparatus comprising a plurality of winding rolls for winding up each of the laminated laminates The above-mentioned thermocompression bonding operation is carried out in a state in which the side end portions of the pair of resin films adjacent to each other in the thickness direction are arranged so as not to overlap.   The shift of the position of the side end of each resin film in the set adjacent to each other in the thickness direction is 0.5 to 5 mm as a relative distance between the side end of one resin film and the side end of the other resin film. The manufacturing method of Claim 1 which exists in the range of these.   The manufacturing method according to claim 1 or 2, which is a method of manufacturing two sets of long laminates having a structure of metal foil / resin film / metal foil at the same time.   The manufacturing method according to any one of claims 1 to 3, wherein the metal foils disposed adjacent to each other in the thickness direction are both rolled copper foils.   The manufacturing method according to any one of claims 1 to 4, wherein the long resin film is a long aromatic polyimide film.   6. The elongate resin film is an elongate thermocompression bonding polyimide film including a non-thermocompression bonding aromatic polyimide film and thermocompression bonding aromatic polyimide layers formed on both side surfaces thereof. The manufacturing method in any one of items. The manufacturing method according to claim 1, wherein the thermocompression bonding apparatus is a double belt press.

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