JP2010287538A - Manufacturing device and manufacturing method of flat cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device and a manufacturing method of a flat cable wherein a conductor portion is heated by induction heating by a high frequency heating device of prescribed specifications combined with heating and pressurizing by a molding roller and a manufacturing line speed is increased by improving adhesiveness to an insulating film. <P>SOLUTION: The manufacturing device of the flat cable in which a plurality of numbers of flat conductors 11 arranged in parallel on a flat face is pinched from both faces, adhered and integrated by the insulating film 14 includes: a first heating pressurizing roll portion 17 to temporarily adhere the flat conductors 11 and the insulating film 14; the high frequency heating portion 19 to induction-heat the flat conductors after temporary adhesion; and a second heating and pressurizing roll portion 18 to permanently adhere it after induction heating. In the high frequency heating portion 19, a spiral coil 19a of 3 turns or more is arranged in the vicinity of a distance of 1.0 mm or less with the flat conductors 11 and induction heating is carried out at a frequency of 250 kHz or more and an output of 5 kWh or more. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a flexible flat cable used for electrical wiring in devices such as communication devices and electronic devices.

  As shown in FIG. 3 (A), a flexible flat cable is formed by arranging a plurality of flat conductors 1 in a parallel row at a predetermined interval and sandwiching them with insulating films 4 from both the upper and lower surfaces thereof. It is formed integrally. The insulating film 4 is composed of two layers, an adhesive layer 2 and an insulating layer 3, and is bonded to the plane of the flat conductor 2 so that the adhesive layer 2 faces each other. Next, when the insulating films 3 are pressed against each other with a heating roller, the adhesive layers 2 are laminated so as to fill the outer periphery of the flat conductor 1, and the flat conductors 1 are kept in an electrically insulated state from each other. .

  FIG. 3B is a diagram showing an example of the flat cable manufacturing method described above, and is disclosed in, for example, Patent Document 1. In this production example, the insulating film 4 is fed out from the film roll 6 arranged above and below the plurality of flat rectangular conductors (also referred to as flat conductors) fed out from the conductor bobbin 5, and the bonding is performed as shown in FIG. The agent layers are arranged so as to face each other, and heated and pressurized by the first heating roll 7 having a surface temperature of 150 ° C. to form a preliminary flat cable.

  Next, the preliminary flat cable is passed between the work coils 9 a of the high-frequency heating device 9 to inductively heat the flat conductor 1 to 200 ° C. Thereafter, the heated preliminary flat cable is heated and pressurized by the second heating roll 8 having a surface temperature of 120 ° C., wound by the winding bobbin 10, and the flexible flat cable shown in FIG. It is disclosed to form.

JP 7-320570 A

  In the flat cable manufacturing method shown in Patent Document 1, the rectangular conductor is heated to 200 ° C. with a high-frequency heating device and its work coil. However, since the rectangular conductor to be heated is narrow and moves at a predetermined linear velocity, a predetermined specification is required for heating to a predetermined temperature, but there is no specific disclosure. For this reason, it is difficult to obtain a predetermined flat cable according to the contents disclosed in the cited document 1.

  The present invention has been made in view of the above-described circumstances, and in combination with heating and pressing by a forming roller, the conductor portion is effectively heated by induction heating by a high-frequency heating device according to a predetermined specification. An object of the present invention is to provide a flat cable manufacturing apparatus and a manufacturing method capable of increasing the bonding speed by increasing the adhesiveness.

A flat cable manufacturing apparatus and manufacturing method according to the present invention is a flat cable manufacturing method in which a plurality of flat conductors arranged in parallel on a flat surface are bonded and integrated from both sides with an insulating film. A first heating and pressing roll unit for temporarily bonding the insulating film; a high-frequency heating unit for induction heating the flat conductor after the temporary bonding; and a second heating and pressing roll unit for main bonding after induction heating. .
The high-frequency heating unit has a spiral coil of 3 turns or more arranged close to the flat conductor at a distance of 1.0 mm or less, and performs induction heating at a frequency of 250 kHz or more and an output of 5 kWh or more. Moreover, you may make it arrange | position the drive part which takes up the tension | tensile_strength to the flat cable integrated by adhesion | attachment in the downstream of the 2nd heating-pressing roll part.

  According to the present invention described above, the insulating film constituting the flat cable and the plurality of flat conductors can be efficiently bonded together by heating, and the production line speed of the cable can be increased to improve the productivity. Can do.

It is a figure explaining the outline of the embodiment of the present invention. It is a figure explaining other embodiment of this invention. It is a figure explaining a prior art.

  Embodiments of the present invention will be described with reference to the drawings. In the figure, 11 is a flat conductor, 12a is a flat cable after temporary bonding, 12b is a flat cable after final bonding, 13 is a shooter, 14 is an insulating film, 15 is a conductor bobbin, 16 is a film roll, and 17 is a first cable. Heating and pressing roll unit, 17a is a forming roller, 18 is a second heating and pressing roll unit, 18a is a forming roller, 19 is a high-frequency heating unit, 19a is a work coil, 19b is a high-frequency heating source, 20 is a winding bobbin, Reference numeral 21 denotes a cooling roll unit, and 22 denotes a take-up drive unit.

  In the flat cable manufacturing apparatus and manufacturing method of the present invention, the flat cable to be manufactured has a plurality of flat conductors (also referred to as flat conductors) at a predetermined interval, as described with reference to FIG. Are arranged in a parallel row and sandwiched from both upper and lower sides in an insulating film and bonded and integrated. The insulating film is composed of two layers, an adhesive layer and an insulating layer, and the adhesive layer is laminated so as to fill the outer periphery of the flat conductor, and the flat conductor is electrically insulated from each other and the arrangement is maintained. Is done.

  In manufacturing the flat cable, first, as shown in FIG. 1, the flat conductor 11 is fed out from the conductor bobbin 15, and the insulating film 14 is fed out from the film roll 16. The flat conductor 11 has a thickness of about 0.035 mm, a width of about 0.3 mm, and a flat copper surface with tin plating or the like, and a plurality of the flat conductors 11 are drawn out in parallel at predetermined intervals. The insulating film 14 is formed, for example, by using polyethylene terephthalate (PET) having a thickness of about 25 μm as an insulating layer and laminating a polyester-based adhesive having a thickness of about 35 μm as an adhesive layer. It is drawn out continuously.

  The insulating film 14 is supplied to the first heating and pressing roll unit 17 so as to sandwich both surfaces of the flat conductor 11 that is drawn out in a parallel row. For example, a shooter 13 can be disposed in front of the first heating and pressing roll unit 17. The flat conductor 11 and the insulating film 14 are guided by the shooter 13 and fed between a pair of heated molding rollers 17a, and are temporarily bonded by heating and pressing. The shooter 13 has a smooth arc-shaped surface so that the insulating film 14 is smoothly transferred, and shields the heat of the forming roller.

  The forming roller 17a of the first heat and pressure roll unit 17 is formed, for example, in a structure in which elastic roller members such as rubber are arranged coaxially on the outer periphery of a circular metal core. The insulating film 14 is disposed so as to be in pressure contact with the roller surfaces of the mutual roller members. The roller member is formed of a heat-resistant resin such as silicon rubber or fluorine rubber. In the molding roller 17a, for example, the surface temperature of the rubber roll member is heated to about 130 ° C. (the metal core portion is about 160 ° C.), and the adhesive layer of the insulating film 14 and the flat conductor 11 are temporarily bonded by pressurization. . The first heating and pressing roll unit 17 can be provided with a take-up drive unit 22 that applies a tensile force to the flat conductor 11 and the insulating film 14.

  The flat cable 12a in a state of being temporarily bonded and cabled by the first heating and pressure roll unit 17 is induction-heated by the high-frequency heating unit 19 to the flat conductor in the cable. The work coil 19a of the high-frequency heating unit 19 is formed by winding a copper conductor having a rectangular cross section into a spiral shape having an outer diameter of about 50 mm and 3 turns or more. The work coil 19a is disposed so as to be in contact with the side surface of the flat cable 12a, and is disposed so that the distance between the coil end surface and the flat conductor 11 in the flat cable 12a is 1.0 mm or less. As the number of turns increases, the magnetic flux density increases and is effective. However, it is practical to set the number of turns to 20 or less from the viewpoint of cost effectiveness.

  The work coil 19a is supplied with a high-frequency current of 250 kHz or higher from the high-frequency heating source 19b and is operated with an output of 5 kWh or higher. By induction heating of the high-frequency heating unit 19, the flat conductor 11 in the flat cable 12a in the temporarily bonded state can be heated to about 180 ° C. By this heating, the adhesive layer at the periphery of the flat conductor is also heated and melted, and the gap between the flat conductor 11 is filled and the adhesiveness is improved. The higher the frequency, the more effective the surface eddy current flows. However, it is practical to set the frequency to 1 MHz or less from the viewpoint of cost effectiveness.

  After the flat cable 12a in the temporarily bonded state is induction-heated, the second heat and pressure roll unit 18 performs the main bonding. The molding roller 18a of the second heat and pressure roll unit 18 is coaxial with an elastic roller member such as rubber on the outer periphery of a circular metal core, like the molding roller 17a of the first heat and pressure roll unit. And is made of a heat-resistant resin such as silicon rubber or fluororubber. The forming roller 18a of the second heat and pressure roll unit 18 is preferably one that has higher heat resistance than the forming roller 17a of the first heat and pressure roll unit 17 and can be used at a surface temperature of 160 ° C. or higher.

  In the second heating and pressing roll unit 18, the high-frequency heating unit 19 and the first heating unit 19 are bonded so that the adhesive layer around the flat conductor is softened or melted by induction heating in the previous stage and is finally bonded before the temperature is lowered as much as possible. It is preferable that the distance between the heating and pressing roll unit 18 is shortened as much as possible. Further, it is preferable that the second heat and pressure roll unit 18 narrows the gap between the forming rollers as much as possible to increase the pressure applied to the flat cable 12a so that the main bonding can be reliably performed. In addition, you may make it provide the take-up drive part 22 which applies the tensile force to the flat cable 12a in the 2nd heating and pressurizing roll part 18. FIG.

  After the main bonding of the flat conductor 11 and the insulating film 14 is performed by the second heating / pressurizing roll unit 18 and the flat cable 12b is formed, for example, the cooling is performed by passing the cooling roller unit 21, and the insulating film The adhesive layer 14 is cured, and the flat conductor 11 and the insulating film 14 are bonded and integrated. The cooling roller unit 21 may be a cooling water tank that does not use a roller. The cooled flat cable 12 b is taken up by the take-up bobbin 20.

  FIG. 2 is a diagram showing another embodiment, and the point that the take-up drive unit 22 for applying a tensile force to the flat cable is provided on the downstream side instead of the second heating and pressing roll unit 18 is shown in FIG. Different from the embodiment. When the take-up drive unit 22 for applying a tensile force is provided in the first heating and pressing roll unit 17 and the second heating and pressing roll unit 18, the first heating and pressing roll unit is heated by the high-frequency heating unit 19. There is a possibility that the flat cable 12a may be stretched and loosened between 17 and the second heating / pressurizing roll 18. If the flat cable 12a is loosened, it may come into contact with the work coil 19a to damage the insulating film, and the induction heating state may become non-uniform.

  Therefore, in this example, the take-up drive unit 22 that applies a tensile force to the cable is not provided in the second heating and pressurizing roll unit 18 but is provided on the downstream side thereof, thereby avoiding the above-described concerns. . In this case, the take-up drive unit 22 is provided on the cooling roll unit 21 as shown in the figure, or a capstan wheel or the like is provided separately to drive the cable. In this case, the second heating / pressurizing roll unit 18 applies an urging force for pressurization to the flat cable 12a, but does not drive for taking the flat cable and is free. . Thereby, the flat cable 12a can always be maintained in a state of being stretched in a straight line with a predetermined tension without being loosened between the first heating and pressing roll unit 17 and the second heating and pressing roll unit 18. .

  As described above, according to the manufacturing apparatus and the manufacturing method of the present invention, the flat conductor and the insulating film can be effectively bonded and integrated by induction heating using a high-frequency heating apparatus. As a result, the production line speed can be increased without increasing the heating temperature of the forming roller, the productivity can be improved, and early deterioration of the forming roller can be avoided.

DESCRIPTION OF SYMBOLS 11 ... Flat conductor, 12a ... Flat cable after temporary bonding, 12b ... Flat cable after final bonding, 13 ... Shooter, 14 ... Insulating film, 15 ... Conductor bobbin, 16 ... Film roll, 17 ... First heating and pressing Roll part, 17a ... Molding roller, 18 ... Second heating and pressing roll part, 18a ... Molding roller, 19 ... High frequency heating part, 19a ... Work coil, 19b ... High frequency heating source, 20 ... Winding bobbin, 21 ... Cooling Roll part, 22 ... take-up drive part.

Claims (3)

A flat cable manufacturing apparatus in which a plurality of flat conductors arranged in parallel on a plane are bonded and integrated from both sides with an insulating film,
A first heating and pressing roll section for temporarily bonding the flat conductor and the insulating film; a high-frequency heating section for induction heating the flat conductor after the temporary bonding; and a second heating unit for main bonding after induction heating. With a pressure roll,
The high-frequency heating unit is an apparatus for manufacturing a flat cable, in which spiral coils of 3 turns or more are arranged close to each other with a distance of 1.0 mm or less from the flat conductor, and induction heating is performed at a frequency of 250 kHz or more and an output of 5 kWh or more.   2. The flat cable manufacturing apparatus according to claim 1, further comprising a take-up drive unit that applies a tensile force to the flat cable integrally bonded to the downstream side of the second heating and pressing roll unit. . A flat cable manufacturing method in which a plurality of flat conductors arranged in parallel on a plane are bonded and integrated from both sides with an insulating film,
The step of temporarily adhering the flat conductor and the insulating film by the first heating and pressing roll unit, then induction heating the flat conductor by the high-frequency heating unit, and then performing the main bonding by the second heating and pressing roll unit With
The method of manufacturing a flat cable, wherein the high-frequency heating unit includes a spiral coil of 3 turns or more arranged close to the flat conductor at a distance of 1.0 mm or less and induction heating at a frequency of 250 kHz or more and an output of 5 kWh or more.

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