JP2003181939A - Method for laminating resin sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for laminating a resin sheet capable of regulating a curling amount of a laminated sheet formed by laminating two resin sheets. <P>SOLUTION: A drawing angle setting means 18 has a plurality of drawing rollers disposed so that the drawing angles are different. The method for laminating the resin sheet comprises the step of forming a second laminated sheet 50 by laminating a first laminating sheet 40 and a resin sheet 30B of a second resin sheet by releasing a release sheet 30c from the first sheet 40 shown in Fig. (b) and bridging the second laminated sheet 50 drawn from between pressurizing rollers 11 and 12 at any of drawing rollers 18a to 18g of the means 18, thereby suitably setting the drawing angle of the sheet 50 when the sheet 50 is drawn from between the rollers 11 and 12, and regulating the curling amount of the sheet 50. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laminating resin sheets, and in particular, to adjust the curl amount of a laminated sheet formed by laminating two resin sheets. The present invention relates to a method for bonding resin sheets. In recent years, further improvement in recording density has been desired for magnetic recording media such as magnetic disks and magnetic tapes. In particular, in a magnetic disk, it is necessary to form a dense magnetic layer into a uniform and smooth thin film in order to improve the recording density. That is, by forming the magnetic layer into a dense and uniform thin film, the recording density can be improved and the recording signal can be shortened, and a magnetic disk with improved electromagnetic conversion characteristics is realized. be able to. A magnetic layer having such characteristics can be realized relatively easily by using a conventionally known sputtering method. That is, if a nonmagnetic support is first formed and then a magnetic layer is formed on this support by sputtering, the film formation conditions (pressure, input power, temperature, target type, etc.) are appropriately set. By controlling, a magnetic layer having desired film quality (film thickness, denseness, smoothness, etc.) can be obtained. The magnetic layer is formed by sputtering.
Since it is carried out while heating the support, the support is required to have a certain degree of heat resistance. Further, in order to obtain a magnetic disk having a high recording density, it is necessary to shorten the distance between the magnetic disk and the read head, and thus it is necessary to flatten the support. Also, in order to rotate the magnetic disk stably, it is better that the thickness of the support is appropriately thick.
However, when it is assumed that magnetic layers are formed on both sides of the support, it is difficult to prepare a resin sheet that satisfies each of the conditions of heat resistance, flatness, and appropriate thickness. For these reasons, the support has a certain degree of heat resistance, flatness,
In order to have an appropriate thickness, it is necessary to form two heat-resistant resins such as polyimide and polyamide, for example. The support can also be formed by bonding two resin sheets such as PEN (polyethylene terephthalate) and PET (polyethylene naphthalate). At that time, each resin sheet is arranged such that the surface with higher flatness is on the outside. However, when two heat resistant resins are bonded together to form a support, the internal stress differs between one heat resistant resin and the other heat resistant resin.
There was a problem that the larger the internal stress, the more the substrate shrinks and the curling occurs on the support. Further, when the magnetic layer is formed on the support, since the support is heated, the entire magnetic disk is curled. Therefore, in order for the magnetic disk to have the required flatness when the magnetic layer is formed on the support, the surface of the support does not need to be flat when the support is formed. In some cases, it is better to curl with the curl amount. The present invention has been devised in view of the above circumstances, and its purpose is to attach a resin sheet capable of adjusting the curl amount of a laminated sheet formed by laminating two resin sheets. It is to provide a method of combining. The method for laminating resin sheets according to the present invention is a method of laminating two resin sheets with an adhesive and sandwiching them between a pair of pressure rollers. A method for laminating a resin sheet to form a laminated sheet, wherein the curling amount of the laminated sheet is adjusted by setting a drawing angle when the laminated sheet is pulled out from between the pressure rollers. . Since the curl amount of the laminated sheet depends on the difference in the internal stress between one resin sheet and the other resin sheet when the two resin sheets are bonded together, the laminated sheet is pressed. By appropriately setting the drawing angle when drawing from between the rollers and changing the magnitude of the internal stress of one or both of the resin sheets, the curl of the laminated sheet can be adjusted to the required curl amount. Also, the resin sheet laminating apparatus of the present invention superimposes two resin sheets via an adhesive,
This is a resin sheet laminating apparatus that forms a laminated sheet by sandwiching it between a pair of pressure rollers, and a drawing angle setting for setting a drawing angle when the laminated sheet is pulled out between the pressure rollers. Means is provided. According to this apparatus, the drawing angle when the laminated sheet is pulled out from between the pressure rollers can be appropriately set by the drawing angle setting means so that the curl of the laminated sheet can be adjusted to a required curl amount. . In addition, by using a plurality of pulling rollers arranged so that the pulling angles are different from each other, the pulling angle when pulling the laminated sheet from between the pressure rollers can be easily set. DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. Here, 2
A case will be described in which a sheet of resin sheets is bonded to form a magnetic disk support. The magnetic disk is manufactured by forming a magnetic layer on the surface of this support. A process for forming a magnetic disk support (hereinafter simply referred to as "support") by bonding two resin sheets will be described below with reference to FIGS. This step includes the first step shown in FIG. 1A and the step shown in FIG.
The second step shown in FIG. The first step is a step of peeling the release paper on one side of the adhesive sheet having the release paper adhered on both sides, and bonding the adhesive sheet and the first resin sheet. Further, the second step is a step of peeling the release paper on the other surface of the adhesive sheet bonded to the first resin sheet and bonding the first resin sheet and the second resin sheet. . These two steps are illustrated in FIG.
The bonding apparatus 10 shown in FIG. First, the bonding apparatus 10 shown in FIG. 2 will be described. The laminating apparatus 10 includes a pair of pressure rollers 11 and 12, a first rotating shaft 13, and a second rotating shaft 1.
4, a third rotating shaft 15 and a fourth rotating shaft 16 are provided. Further, the laminating apparatus 10 includes a first
First delivery roll A attached to the rotary shaft 13 and second delivery roll B attached to the second rotational shaft 14
A plurality of guide rollers 17 are provided for guiding the travel of the sheets 20 to 50 fed out from the sheet. Further, between the pressure rollers 11 and 12 and the fourth rotating shaft 16, the second laminated sheet 50 formed by being bonded by the pressure rollers 11 and 12 in the second step is the pressure roller 11. , 12
A pulling angle setting means 18 is provided for setting a pulling angle when pulling out from the space (see FIG. 1B). A first delivery roll A around which a first sheet (resin sheet 20A in FIG. 1A and resin sheet 20B in FIG. 1B) is wound is attached to and detached from the first rotating shaft 13. It is attached freely. This first delivery roll A is
The first sheet 20A (20B) is sent out between the pressure rollers 11 and 12 by the first rotating shaft 13 being rotated by a driving means (not shown). A second sheet ((adhesive sheet 30 in FIG. 1 (a), (first laminated sheet 40 in FIG. 1 (b)) is wound around the second rotating shaft 14 by a second sheet. The second output roll B is detachably attached to the second output roll B. The second output shaft B is rotated by a driving means (not shown) so that the second sheet 30 (40) is attached to the second output roll B.
It sends out between the pressure rollers 11 and 12. The second sheet 30 (40) fed from the second feeding roll B
In the middle of being sent to the pressure rollers 11 and 12, the release paper on one side is peeled off. It should be noted that the first sheet 20A (20B) wound around the first delivery roll A and the second delivery roll B.
Since the second sheet 30 (40) wound around is pulled out by the rotation of the pressure rollers 11, 12, the first rotating shaft 13 and the second rotating shaft 14 do not necessarily require a driving means. . The third rotating shaft 15 has a second sheet 30 on it.
A release paper take-up roll C for winding up the release paper (release paper 30b in FIG. 1A and release paper 30c in FIG. 1B) peeled from (40) is detachably attached. The release paper take-up roll C has the release paper 30b (30c) peeled off from the second sheet 30 (40) when the third rotating shaft 15 is rotated by a driving means (not shown).
Wind up. The pressure rollers 11 and 12 are fed from the first delivery roll A and the second delivery roll B, respectively.
Sheet 20A (20B) and second sheet 30 (40)
When pasting together, press both sheets from above and below,
Crimp the sheets together. Further, the pressure rollers 11 and 12
Is connected to a heat source (not shown) and the first sheet 2
When the 0A (20B) and the second sheet 30 (40) are bonded together, both sheets are heated by heating itself. For example, rubber can be used for the pressure rollers 11 and 12. One or both of the pressure rollers 11 and 12 are rotationally driven by a driving means (not shown). The fourth rotating shaft 16 has a pressure roller 11,
12 laminated together (FIG. 1 (a))
Then, a laminated sheet take-up roll D for winding up the first laminated sheet 40 and the second laminated sheet 50 in FIG. 1B is detachably attached. The laminated sheet take-up roll D takes up the laminated sheet 40 (50) when the fourth rotating shaft 16 is rotated by a driving means (not shown). As shown in FIG. 3, the drawing angle setting means 18 is composed of a plurality of drawing rollers 18a to 18g arranged so as to have different drawing angles. The drawing rollers 18a to 18g have a drawing angle of 0 degrees (18a), 5 degrees (18b), where the drawing angle when the laminated sheet 50 is pulled out horizontally between the pressure rollers 11 and 12 is 0 degrees.
10 degrees (18c), 15 degrees (18d), 20 degrees (18
e) It is arranged at a position of 25 degrees (18f) and 30 degrees (18g). Therefore, the second shown in FIG.
In this step, the drawing angle when the laminated sheet 50 is pulled out from between the pressure rollers 11 and 12 by passing the laminated sheet 50 drawn out between the pressure rollers 11 and 12 between any of the drawing rollers 18a to 18g. Can be set. In FIG. 1B, since the laminated sheet 50 drawn out between the pressure rollers 11 and 12 is stretched over the drawing roller 18g, the drawing angle is 30 degrees. The number of the drawing rollers of the drawing angle setting means 18 and the drawing angle of each drawing roller can be appropriately changed according to the purpose. Next, in the first step, which is performed using the bonding apparatus 10 described above, that is, the release paper 30b is peeled off from the adhesive sheet 30, and the adhesive sheet 30 and the resin sheet which is the first resin sheet. 1st pasted with 20A
The process of forming the laminated sheet 40 of FIG.
A description will be given with reference to (a). The resin sheet 20A wound around the first delivery roll A is later formed with a magnetic layer on the surface by sputtering, so that it can withstand the heating during sputtering, such as polyamide or polyimide. These heat resistant resins are used. This resin sheet 20A is the first
The feed roll A is fed toward the pressure rollers 11 and 12 by the rotation of the feed roll A. As shown in FIG. 4, the adhesive sheet 30 wound around the second delivery roll B is obtained by bonding release papers 30b and 30c to both sides of the adhesive layer 30a. The adhesive sheet 30 is rotated by the rotation of the second delivery roll B.
It is sent out toward the pressure rollers 11 and 12. At this time, the adhesive sheet 30 has the release sheet 30b as the resin sheet 2.
As shown in FIG. 5, the release paper 30 b is fed so as to be on the side to be bonded to 0 A, and the pressure rollers 11, 1
It is peeled off while being sent to 2. The peeled release paper 30b is taken up by the release paper take-up roll C. The resin sheet 20A and the adhesive sheet 30 fed toward the pressure rollers 11 and 12 are sandwiched between the pressure rollers 11 and 12, as shown in FIG. It is pressed while being heated. At this time, the release paper 30b of the adhesive sheet 30 has already been peeled off, and the side facing the resin sheet 20A of the adhesive layer 30a is exposed, so the adhesive layer 30a of the adhesive sheet 30 is removed from the resin sheet. It can be attached to 20A. Thus, the 1st lamination sheet 40 which bonded 20 A of resin sheets and the adhesive sheet 30 is formed. The first laminated sheet 40 includes pressure rollers 11 and 1.
After being pulled out from between the two, it is guided by the guide roller 17 and taken up by the laminated sheet take-up roll D. Next, in the second step, that is, the release paper 30c is peeled off from the first laminated sheet 40, and the first laminated sheet 40 and the resin sheet 20B as the second resin sheet are bonded together. The process of forming the two laminated sheets 50 will be described mainly with reference to FIG. For the resin sheet 20B wound around the first delivery roll A, for example, a heat resistant resin such as polyamide or polyimide is used in the same manner as the resin sheet 20A. The resin sheet 20B is sent out toward the pressure rollers 11 and 12 by the rotation of the first delivery roll A. As shown in FIG. 7, the first laminated sheet 40 wound around the second delivery roll B is a resin sheet 20.
A, the adhesive layer 30a, and the release paper 30c are laminated in order. The first laminated sheet 40 is sent out toward the pressure rollers 11 and 12 by the rotation of the second delivery roll B. At this time, the first laminated sheet 40 is sent out so that the release paper 30c is on the side to be bonded to the resin sheet 20B, and the release paper 30c is directed toward the pressure rollers 11 and 12, as shown in FIG. Peeled off while being sent. The peeled release paper 30c is taken up by the release paper take-up roll C. As shown in FIG. 9, the resin sheet 20B sent to the pressure rollers 11 and 12 and the first laminated sheet 40 are sandwiched between the pressure rollers 11 and 12, as shown in FIG. 12 is pressed while being heated. At this time, the release paper 30c of the first laminated sheet 40 has already been peeled off, and the side of the adhesive layer 30a facing the resin sheet 20B is exposed, so the adhesive sheet 30
The adhesive layer 30a can be adhered to the resin sheet 20B. Thus, the 2nd lamination sheet 50 (refer FIG. 10) which bonded the resin sheet 20B and the 1st lamination sheet 40 is formed. This second laminated sheet 50
Becomes a support for the magnetic disk. The laminated sheet (support) 50 is formed by bonding the two resin sheets 20A and 20B as described above. The resin sheet 20A and the resin sheet 20 are bonded together.
If the magnitude of the internal stress is different in B, the larger internal stress shrinks and the entire support 50 is curled. Therefore, in the resin sheet laminating method of the present invention, the support member 50 is attached to the pressure rollers 11, 1 by the drawing angle setting means 18.
The curling amount of the support 50 was adjusted by appropriately setting the pulling angle when pulling out from between the two and changing the magnitude of the internal stress of the resin sheet 20A and the resin sheet 20B. Hereinafter, the drawing angle of the support 50 and the support 5
The relationship with the curl amount of 0 will be described. Here, as an example, the drawing angle of the support 50 is 0 degree, 15 degrees, 3 degrees
A case where the angle is 0 degrees will be described. After the support 50 is pulled out between the pressure rollers 11 and 12, the pulling angle setting means 18 (see FIG. 3).
The drawing angle from between the pressure rollers 11 and 12 is set by being stretched over any one of the drawing rollers 18a to 18g. For example, as shown in FIG. 11A, when the support body 50 is stretched over the pull-out roller 18a, the pull-out angle of the support body 50 is 0 degree. Similarly, FIG. 11 (b)
As shown in FIG. 11, when the support 50 is stretched over the drawing roller 18 d, the pulling angle of the support 50 is 15 degrees, and as shown in FIG.
When it extends over g, the pulling-out angle of the support body 50 is 30 degrees. FIG. 12 is a schematic view showing a state in which the support 50 is curled. FIG. 12A shows a case where the drawing angle is 0 degree.
(B) shows the case where the drawing angle is 15 degrees, and (c) shows the case where the drawing angle is 30 degrees. In addition, the support body 50 at this time is
It is punched into a disk shape similar to a magnetic disk.
In FIG. 12, the resin sheet 20A is on the upper side and the resin sheet 20B is on the lower side. As shown in FIGS. 12A to 12C, it can be seen that the curl amount of the support 50 varies depending on the pulling angle of the support 50. That is, as shown in FIG. 12A, when the pull-out angle is 0 degree, the support 5
In FIG. 12B, 0 is curled convexly on the upper side.
As can be seen from the graph, when the drawing angle is 15 degrees, the support 50 has a smaller curl amount than the support 50 of FIG. Further, as shown in FIG. 12C, when the drawing angle is 30 degrees, the support 50 is curled convexly on the lower side. FIG. 13 is a table showing the relationship between the drawing angle of the support 50 and the curl amount. The curl amount was measured as follows. First, the support 50 is punched out to the size of a magnetic disk (diameter 3.5 inches), and is rotated at a rotational speed of 60 rpm while being vertically supported. Next, the difference between the closest position and the farthest position during one rotation of the rotated support 50 is measured using a caliper. The value measured in this way is set as the curl amount of the support 50. The curl amount was defined as plus for the curl whose upper side warps convexly, and minus for the curl whose lower side warps convexly. As shown in FIG. 13, when the drawing angle is 0 degree (see FIG. 11A), the curl amount of the support 50 is 3.9 mm and the drawing angle is 15 degrees (see FIG. 11). FIG.
1 (b)), the curl amount of the support 50 is 2.3 m.
m, when the drawing angle was 30 degrees (see FIG. 11C), the curl amount of the support 50 was -1.0 mm. From this, in this Embodiment, it turns out that the quantity which the support body 50 curls convexly below becomes small, so that a drawer angle is enlarged. In addition, when the drawing angle exceeds 30 degrees, it can be seen that the support body 50 is curled convex upward. From the above results, the drawing angle setting means 18
Thus, it can be seen that the curl amount of the support 50 can be adjusted by appropriately setting the drawing angle when the support 50 is pulled out between the pressure rollers 11 and 12. Although the present invention has been described in detail based on the embodiments of the present invention, the present invention is not limited only to the embodiments of the present invention. For example, various materials can be used for the resin sheet. Further, the adhesive is not limited to a sheet, but a liquid adhesive or the like may be used. Further, the drawing angle setting means 18 may not be constituted by a plurality of drawing rollers, but may be constituted by a single movable drawing roller capable of changing the drawing angle. According to the present invention, it is possible to provide a method for laminating resin sheets that can adjust the curl amount of a laminated sheet formed by laminating two resin sheets.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a process of bonding two resin sheets to form a support, and (a) shows a process of bonding a first resin sheet and an adhesive sheet. (B) shows the process of bonding the 1st resin sheet with which the adhesive agent sheet was bonded together, and the 2nd resin sheet. FIG. 2 is a schematic view showing a bonding apparatus. 3 is a schematic view showing a drawing angle setting means of the bonding apparatus in FIG. 2. FIG. FIG. 4 is a cross-sectional view showing an adhesive sheet. FIG. 5 is a cross-sectional view showing a state where the release paper is peeled off from the adhesive sheet. FIG. 6 is a cross-sectional view showing a state in which a first resin sheet and an adhesive sheet are bonded together. FIG. 7 is a cross-sectional view showing a first laminated sheet. FIG. 8 is a cross-sectional view showing a state where the release paper is peeled off from the adhesive sheet. FIG. 9 is a view showing a state in which a first laminated sheet and a second resin sheet are bonded together. FIG. 10 is a cross-sectional view showing a support. FIG. 11 is a view showing a state in which the pulling angle of the support is set by the pulling angle setting means. FIG.
In the case of degrees, (b) shows a case where the drawing angle is 15 degrees, and (c) shows a case where the drawing angle is 30 degrees. FIGS. 12A and 12B are schematic views showing a state in which the support is curled. FIG. 12A is a drawing angle of 0 degree, FIG. 12B is a drawing angle of 15 degrees, and FIG. 12C is a drawing angle of 30 degrees. This case is shown. FIG. 13 is a table showing the relationship between the drawing angle of the support and the curl amount. DESCRIPTION OF SYMBOLS 10 Bonding device 11, 12 Pressure roller 13 1st rotating shaft 14 2nd rotating shaft 15 3rd rotating shaft 16 4th rotating shaft 17 Guide roller 18 Pull-out angle setting means 18a-18g Guide roller A First delivery roll B Second delivery roll C Release paper take-up roll D Laminated sheet take-up roll 20A, 20B Resin sheet 30 Adhesive sheet 30a Adhesive layer 30b Release paper 30c Release paper 40 First laminate sheet 50 Second laminated sheet (support)

Continued front page    F-term (reference) 4F211 AD05 AD08 AG01 AG03 AR07                       AR13 TA03 TC05 TJ31 TN06                       TN43 TN56 TQ03 TQ14 TW21                 5D006 CB07 CB08                 5D112 BA09 GB08

Claims (1)

What is claimed is: 1. A method for laminating resin sheets, wherein two resin sheets are overlapped with an adhesive and sandwiched between a pair of pressure rollers to form a laminated sheet. The method for laminating resin sheets, wherein the curling amount of the laminated sheet is adjusted by setting a drawing angle when the laminated sheet is drawn out between the pressure rollers.