JP2012061616A - Single-sided metal-clad laminated sheet, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem with a conventional method of manufacturing a single-sided metal-clad laminated sheet, wherein a striped strain is generated and thereby a bonding quality is degraded.SOLUTION: The method is provided for manufacturing the single-sided metal-clad laminated sheet formed by bonding an insulating film with a conductive film through a thermoplastic adhesive. In the method, the insulating film with the thermoplastic adhesive is adhered along a heated metallic roller, and also the insulating film and the conductive film are introduced between the metallic roller and an elastic roller, while the conductive film is adhered along the heated elastic roller.

Description

  The present invention relates to a single-sided metal-clad laminate and a method for producing a single-sided metal-clad laminate.

  Conventionally, a manufacturing method of a single-sided metal-clad laminate in which an insulating film is placed along a rubber roller with a pair of rollers and then a conductive film is thermocompression bonded to the insulating film is known (for example, , See Patent Document 1).

JP 2001-79946 A

  However, in the manufacturing method of Patent Document 1, when the conductive film is thin, thermal expansion may not be released when it comes into contact with the heated metallic roller. Further, in the case of a conductive film having a smooth surface, it sticks to the surface of the heated metallic roller, and thermal expansion cannot be released. As a result, there is a problem that streak-like distortion occurs in the insulating film and the conductive film, and the bonding quality between the insulating film and the conductive film is deteriorated.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A method for producing a single-sided metal-clad laminate according to this application example is a method for producing a single-sided metal-clad laminate in which an insulating film and a conductive film are bonded and formed via a thermoplastic adhesive. The insulating film with thermoplastic adhesive is placed along a heated metallic roller, and the conductive film is placed along a heated elastic roller, and the insulating film and the conductive film are placed along the heated elastic roller. A conductive film is introduced between the metallic roller and the elastic roller.

  In the manufacturing method of this application example, the metallic roller and the elastic roller are arranged with the insulating film with the thermoplastic adhesive along the heated metallic roller and the conductive film along the heated elastic roller. By introducing in between, the thermal expansion of the insulating film and the conductive film when contacting the roller can be released, the generation of streak-like distortion can be prevented, and the bonding quality can be improved. In particular, since the conductive film is conveyed following the elastic roller while the stress is relaxed, generation of wrinkles and the like can be eliminated before being introduced between the metallic roller and the elastic roller.

  Application Example 2 A single-sided metal-clad laminate according to this application example is manufactured by the above-described method for manufacturing a single-sided metal-clad laminate.

  According to this configuration, a single-sided metal-clad laminate with high bonding quality between the insulating film and the conductive film can be provided.

Sectional drawing which shows the structure of a single-sided metal-clad laminated board. The schematic diagram which shows the manufacturing method of a single-sided metal clad laminated board.

  First, the structure of a single-sided metal-clad laminate will be described. FIG. 1 is a cross-sectional view showing a configuration of a single-sided metal-clad laminate. As shown in FIG. 1, the single-sided metal-clad laminate 6 is obtained by bonding a conductive film 2 and an insulating film 8 to each other via a thermoplastic adhesive 7.

  Next, a method for manufacturing a single-sided metal-clad laminate will be described. FIG. 2 is a schematic view showing a method for producing a single-sided metal-clad laminate. The method for producing a single-sided metal-clad laminate in this embodiment is a method for producing a single-sided metal-clad laminate in which an insulating film and a conductive film are bonded and formed via a thermoplastic adhesive, and is thermoplastic. With the insulating film with adhesive along the heated metal roller and the conductive film along the heated elastic roller, the insulating film and the conductive film are connected to the metallic roller and the elastic roller. Introduced in between. This will be specifically described below.

  As shown in FIG. 2, the insulating film 1 (7, 8) with the thermoplastic adhesive is placed along the heated metallic roller 3, and the conductive film 2 is placed along the heated elastic roller 4. Then, it is introduced between the metallic roller 3 and the elastic roller 4 and thermocompression bonded to produce a single-sided metal-clad laminate 6. The insulating film 1 with a thermoplastic adhesive is a polyimide film, for example, and the thickness thereof is preferably in the range of 20 to 60 μm, and more preferably in the range of 30 to 50 μm. The conductive film 2 is, for example, a copper foil, and the thickness is preferably in the range of 5 to 18 μm, and more preferably 8 to 10 μm.

  The surface temperature of the metallic roller 3 is preferably in the range of 250 to 400 ° C, and the surface temperature of the elastic roller 4 is preferably in the range of 100 to 300 ° C. In this embodiment, the insulating film 1 and the conductive film 2 with a thermoplastic adhesive are conveyed along the metallic roller 3 and the elastic roller 4 before thermocompression bonding between the metallic roller 3 and the elastic roller 4. Therefore, it is necessary to release the dimensional change caused by thermal expansion that occurs when both rollers are brought into contact with each other. Hereinafter, this process is referred to as a thermal expansion release process.

  When the thermocompression bonding temperature is lower than 250 ° C., even if the insulating film 1 with the thermoplastic adhesive and the conductive film 2 are not bonded at all or are bonded, the laminate of both is easily peeled off. It becomes a thing and cannot withstand practical use. Further, when there is no thermal expansion releasing step, the insulating film 1 with the thermoplastic adhesive and the conductive film 2 are distorted due to rapid thermal expansion at the moment when they are in contact with both heated rollers. The appearance of the tension laminate 6 deteriorates, and when a circuit is formed, it causes a short circuit or disconnection and cannot be put into practical use. In order to prevent distortion due to rapid thermal expansion, when increasing the tension of the unwinding portion, streak-like distortion occurs parallel to the longitudinal direction of the single-sided metal-clad laminate 6, and when reducing the tension, single-sided A streak-like distortion is generated parallel to the width direction of the metal-clad laminate 6, making it impossible to manufacture the single-sided metal-clad laminate 6 with good bonding quality.

  Therefore, the insulating film 1 and the conductive film 2 with the thermoplastic adhesive, in which the dimensional change due to the thermal expansion is released by the thermal expansion releasing process, is performed between the heated metallic roller 3 and the heated elastic roller 4. There is no distortion during thermocompression bonding. The heating temperature of the metallic roller 3 and the elastic roller 4 needs to be set in consideration of the material, thermal expansion coefficient, and thickness of the insulating film 1 and the conductive film 2 with a thermoplastic adhesive. For example, when using a polyimide film with a polyimide-based thermoplastic adhesive, the heating temperature of the metallic roller 3 is preferably about 250 to 350 ° C. Moreover, when using the copper foil of thickness 8-10 micrometers manufactured by the electrolysis method, the heating temperature of the elastic roller 4 has a preferable temperature of about 150-250 degreeC.

  The diameters of the metallic roller 3 and the elastic roller 4 used in this embodiment are preferably in the range of 15 to 45 cm, and the diameters of both are preferably substantially the same. In the thermal expansion release process, the insulating film 1 with the thermoplastic adhesive layer, the metallic roller 3, the contact angle θ 1, and the contact angle θ 2 between the conductive film 2 and the elastic roller 4 are: Is preferably in the range of 30 to 350 °, more preferably in the range of 180 to 270 °. Further, the contact angles θ1 and θ2 may be the same. The contact angles θ1 and θ2 can be adjusted at the position of the guide roller 5.

  The insulating film 1 with a thermoplastic adhesive releases thermal expansion when the thermal expansion that occurs when contacting the metallic roller 3 increases the sliding dimension on the metallic roller 3, and is in a no-tension state. . In the present embodiment, by adjusting the diameter of the metallic roller 3 and its rotational speed, the contact angle θ1 between the insulating film 1 with the thermoplastic adhesive and the metallic roller 3, etc., the metallic roller 3 and the elastic roller 3 are elastic. Before reaching the thermocompression bonding between the rollers 4, the insulating film 1 with the thermoplastic adhesive is brought into a no-tension state. Similarly, the conductive film 2 is brought into a non-tensioned state before the thermocompression bonding between the metallic roller 3 and the elastic roller 4.

  When the pressure applied to the insulating film 1 and the conductive film 2 with the thermoplastic adhesive between the metallic roller 3 and the elastic roller 4 is a combination of rollers that do not substantially deform at the pressurizing site. Is preferably 5 kg / cm or more in terms of linear pressure in order to develop sufficient adhesive force. The upper limit of the pressure is not particularly limited, but it is desirable not to exceed 200 kg / cm in terms of linear pressure. In addition, the linear pressure here is the value which remove | divided the force (crimping load) provided to each roller by the effective width | variety of a roller.

  According to this embodiment, in order to obtain a single-sided metal-clad laminate 6 having a good appearance and excellent adhesion and dimensional stability, the rotation speed of the roller is changed to the outer circumference when thermocompression bonding is performed between both rollers. The linear velocity is preferably 30 m / min or less. The lower limit is not particularly limited. However, if the rotational speed is too low, the production efficiency is lowered. Therefore, it is desirable that the lower limit is not lower than 0.1 m / min. The single-sided metal-clad laminate 6 is formed through the above steps.

  Therefore, according to the above embodiment, the following effects can be obtained.

  Since the conductive film is conveyed along the heated elastic roller, the single-sided metal-clad laminate 6 is provided which has no appearance of streak-like distortion due to thermal expansion, good appearance, and sufficient adhesive strength. The

  DESCRIPTION OF SYMBOLS 1 ... Insulating film with a thermoplastic adhesive, 2 ... Conductive film, 3 ... Metallic roller, 4 ... Elastic roller, 5 ... Guide roller, 6 ... Single-sided metal-clad laminate, 7 ... Thermoplastic adhesive, 8 ... insulating film.

Claims (2)

A method for producing a single-sided metal-clad laminate in which an insulating film and a conductive film are bonded and formed via a thermoplastic adhesive,
While keeping the insulating film with the thermoplastic adhesive along a heated metal roller, the conductive film along the heated elastic roller,
The method for producing a single-sided metal-clad laminate, wherein the insulating film and the conductive film are introduced between the metallic roller and the elastic roller.   A single-sided metal-clad laminate produced by the method for producing a single-sided metal-clad laminate according to claim 1.

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