JP3896389B2 - Film laminator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film laminator for attaching a dry film such as a photosensitive resist film on the surface of a printed circuit board, a liquid crystal display board, a plasma display board or other various boards.
[0002]
[Prior art]
A conventional film laminator (also referred to as a sticking apparatus) that attaches a dry film such as a photosensitive resist film to the surface of a substrate uses a flat roll as a lamination roll that contacts the substrate via the dry film.
[0003]
When a dry film is attached to a substrate using a lamination roll, it is necessary to make the pressure that the lamination roll presses the substrate through the dry film uniform, and to apply the dry film with a uniform pressure over the entire substrate. In general, since the both ends of the lamination roll are pressurized, the lamination roll bends, and a curved pressure distribution determined by the applied pressure and the rigidity of the lamination roll is determined. That is, the pressure which pushes a board | substrate in both ends of a lamination roll is high, and a pressure falls, so that it becomes a center part. This tendency becomes more prominent as the pressing force at both ends of the lamination roll is increased.
[0004]
If the pressure of the lamination roll is increased when trying to apply a dry film to the substrate at a high pressure, the pressure at both ends of the substrate increases, but the pressure at the center decreases. Will drop. Furthermore, when this pressure distribution becomes extreme, wrinkles are generated in the dry film, and the pasting performance is significantly reduced.
[0005]
Therefore, as in the invention described in JP-A-6-315980, it has been proposed to use a backup roll in order to increase the pressure applied to the lamination roll.
[0006]
[Problems to be solved by the invention]
However, even if the pressure distribution is made uniform by using a backup roll, if the substrate size in the axial direction of the lamination roll (hereinafter referred to as the substrate width) is different, the pressure distribution of the lamination roll changes and the pasting performance may deteriorate. It was confirmed.
[0007]
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a film laminator that can apply a uniform pressure to a substrate even if the substrate width changes, and can adhere a film to the substrate without generating wrinkles. .
[0008]
[Means for Solving the Problems]
A feature of the present invention that achieves the above object is that a film is attached to one or both sides of a substrate sequentially conveyed from a substrate feeding device by a lamination roll, and a backup roll is provided on the lamination roll, At least one of the lamination roll and the backup roll is a crown roll, and a desired pressure is applied to both the lamination roll and the backup roll.
[0009]
In the combination of a flat roll and a crown roll or a crown roll and a crown roll, if pressure is applied to both ends of each roll, the tendency of the pressure distribution to the substrate can be reversed, so at least one of the lamination roll and the backup roll By adjusting the pressing force at both ends of the lamination roll and the pressing force at both ends of the backup roll, the pressing force of the lamination roll {or linear pressure (= pressing pressure ÷ roll length)}} Or even if a board | substrate width changes, the pressure distribution with respect to the board | substrate with a lamination roll can be made uniform.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The film laminator of the present invention will be described with reference to an embodiment shown in FIG.
In FIG. 1, the board | substrate B is conveyed on the conveyance roll 1 of an entrance conveyor. The cover film 4 of the dry film 3 such as a resist film fed from the feeding roll 2 is wound up by the winding roll 5. The dry film 3 from which the cover film has been removed is conveyed by a lamination roll 7 made of a flat roll via a roll 6 and is stuck on the substrate B. There is a backup roll 8 made of a crown roll outside the lamination roll 7. The outer periphery of the lamination roll 7 is covered with rubber, and the elasticity of the rubber prevents the rolls 7 and 8 from being damaged by friction, and has the effect of improving the followability when the dry film 3 is attached to the substrate B. . This elastic coating may be omitted.
[0011]
The pressure applied to both ends of the lamination roll 7 with respect to the substrate B is applied by the air cylinder 10 via the clamp arm 9. Further, a pressure is applied to the backup roll 8 by the air cylinder 11. The air cylinders 10 and 11 are independent drive systems to facilitate adjustment of the applied pressure.
[0012]
After affixing the dry film 3 to the substrate B, the dry film 3 is cut by the cutter 12 and further sent downstream by the transport roll 13 of the exit conveyor.
[0013]
The substrate B is transported from the lower left to the upper right in the figure on the transport rolls 1 and 13, and the dry film 3 is supplied to the substrate B symmetrically in the vertical direction and is attached to the upper and lower sides of the substrate B. Here, the substrate B on the conveying rolls 13 of the exit conveyor in order to facilitate understanding of the shape relationship between the dry film 3 to be pasted to the substrate B, was omitted dry film 3 of the upper pasted.
[0014]
In this way, the dry film 3 is attached to the substrate B. As described above, by adjusting the pressing force of the lamination roll 7 that is a flat roll and the pressing force of the backup roll 8 of the crown roll, the dry film 3 is applied to the substrate B. The dry film 3 can be reliably affixed without making the pressure distribution uniform and causing wrinkles on the upper and lower surfaces of the substrate B.
[0015]
Hereinafter, adjustment of the pressure distribution on the substrate B will be described.
FIG. 2A shows a state in which the dry film 3 on the upper and lower surfaces of the substrate B is pressed with only one of the conventional methods, that is, a lamination roll 7 made of a flat roll.
[0016]
When a pressing force of P is applied to both ends of each lamination roll 7 in the direction of the arrow, a deflection determined by the self-weight of the lamination roll 7 and the pressing force P and the rigidity of the lamination roll 7 occurs in the lamination roll 7. FIG. 2B schematically shows the pressure (roll pressure) applied to the substrate due to the bending at this time.
[0017]
When the applied pressure P is small (linear pressure is small), as shown by the curve a, the amount of deflection is small and the distribution of pressure (roll pressure) on the substrate B is relatively flat in the width W direction of the substrate. When the applied pressure P is large (the linear pressure is large), the amount of deflection is large as shown by the curve b, and the pressure distribution (roll pressure) on the substrate B becomes steep at both ends. That is, when the linear pressure is increased, the pressure drop at the central portion of the substrate B increases, and the adhesion of the dry film 3 decreases at the central portion of the substrate B. Moreover, the dry film 3 due to non-uniform pressure distribution. It can be seen that this causes wrinkles on the substrate B.
[0018]
FIG. 3A also shows an example in which only the crown roll is used as one of the conventional systems, that is, the lamination roll 7.
In this case, as shown by the curve c in FIG. 3B, the pressure distribution (roll pressure to the substrate B) is uniform at a certain linear pressure, but when the linear pressure is further increased, the pressure distribution is at both ends as shown by the curve d. increases in parts, will be lowered at both ends as indicated by lowering the line pressure curve e reversed.
[0019]
When the substrate width W changes, both the flat roll of FIG. 2 and the crown roll of FIG. 3 change to the same pressure distribution when the substrate width is reduced, and the linear pressure is decreased when the substrate width is increased. It changes to the same pressure distribution as the case.
[0020]
FIG. 4A shows a lamination roll 7 and a backup roll 8 according to an embodiment of the present invention shown in FIG. 1. The pressure applied to the lamination roll 7 made of a flat roll is P1, and the roll is made of a crown roll. The pressure applied to the backup roll 8 is P2.
[0021]
The pressure distribution by the lamination roll 7 is in the form of a curve h in FIG. 4C, as in FIG. On the other hand, since the pressure distribution by the backup roll 8 has a crown shape, the pressure distribution is as shown by a curve f in FIG. As a result of complementation of the curves h and f (cancelling properties mutually), the pressure distribution in which the lamination roll 7 pushes the substrate B through the dry film 3 has the shape of the curve j in FIG. Even if the substrate width W changes, a uniform pressure can be applied. Accordingly, the dry film 3 is pressed over the entire surface of the substrate B with a uniform pressure to obtain a good adhesion performance, that is, the dry film 3 can be adhered to the substrate B without generating wrinkles even if the substrate width changes. it can.
[0022]
When the linear pressure of the lamination roll 7 needs to be increased due to the relationship between the substrate B and the dry film 3, the pressure P1 is increased (curve i in FIG. 4C) and the pressure of the backup roll 8 is increased. When P2 is adjusted to obtain the pressure distribution of the curve g in FIG. 4B, the pressure distribution becomes uniform as shown by the curve k in FIG. Thus, a desired pressure distribution can be freely obtained by adjusting the pressures P1 and P2 of each other. Similarly, even when the substrate width of the substrate B changes, the range of the uniform pressure distribution in the width direction can be changed by adjusting the applied pressures P1 and P2, and the uniform width suitable for the changed substrate width can be changed. A pressure distribution can be obtained.
[0023]
Such adjustment includes the relationship between the pressure applied to the flat roll having an arbitrary diameter and the pressure distribution (characteristics shown in FIG. 4C), the pressure applied to the crown roll having an arbitrary crown amount and diameter, and the pressure. By measuring the distribution relationship (characteristics shown in FIG. 4B) in advance, it is possible to easily set the pressure applied to each of the rolls 7 and 8 in accordance with the substrate width.
[0024]
As shown in FIG. 5, the lamination roll 7 is a crown roll and the backup roll 8 is a cylindrical flat roll, or the opposite side of the lamination roll 7 and the backup roll 8 is a plane as shown in FIG. A table 20 may be used.
[0025]
Further, in the embodiment of FIG. 6, the lamination roll 7 may be a crown roll as in the embodiment of FIG. 5, and the backup roll 8 may be a flat roll.
Further, both the lamination roll 7 and the backup roll 8 in FIGS. 5 and 6 may be crown rolls.
[0026]
4 and 5, if the dry film 3 is attached to only one side of the substrate B, the lamination roll 7 in contact with the substrate B on the opposite side of the dry film 3 can be omitted from the rubber coating.
[0027]
If the lamination roll 7 and the backup roll 8 have the same diameter, it is easy to adjust the pressures P1 and P2. Further, when the diameter of the lamination roll 7 is made smaller than that of the backup roll 8, the pressing area of the lamination roll 7 to the substrate B through the dry film 3 becomes small, and the pressing of the substrate B becomes effective. When the diameter of the lamination roll 7 is increased, the pressing area to the substrate B becomes large and the pressing to the substrate B becomes soft.
[0028]
FIG. 1 shows an example in which the dry film 3 is continuously supplied to the substrate B and is cut by the cutter 12 after being attached. However, the dry film 3 is previously matched to the dimensions of the substrate B. The present invention can also be implemented by a single-wafer type sticking device cut by a cutter.
[0029]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain a film laminator that can apply a uniform pressure even when the substrate width changes, and can adhere a film to the substrate without generating wrinkles. .
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a film laminator according to an embodiment of the present invention.
FIG. 2 is a diagram showing a pressure distribution when a flat roll is used as a lamination roll.
FIG. 3 is a diagram showing the state of pressure distribution when a crown roll is used as a lamination roll.
4 is a diagram showing a state of pressure distribution with respect to a substrate when a flat roll is used as a lamination roll and a crown roll is used as a backup roll and the pressure applied to each roll is changed in the embodiment shown in FIG.
FIG. 5 is a diagram showing a combination of a lamination roll and a backup roll according to another embodiment of the present invention.
FIG. 6 is a diagram showing a combination of a lamination roll and a backup roll according to still another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1 ... Conveyance roll 2 ... Feeding roll 3 ... Dry film 4 ... Cover film 5 ... Winding roll 6 ... Roll 7 ... Lamination roll 8 ... Backup roll 9 ... Clamp arm 10, 11 ... Air cylinder 11 ... Air cylinder 12 ... Cutter 20 ... Planar table B ... Substrate P, P1, P2 ... Pressure

Claims (4)

In what sticks a film with a lamination roll on one side or both sides of a substrate sequentially conveyed from a substrate feeding device,
A backup roll is provided in the lamination roll, and at least one of the lamination roll and the backup roll is a crown roll, and both the lamination roll and the backup roll are adjusted to each other in relation to a curve of pressure distribution applied to the substrate. A film laminator having means for applying a pressing force. 2. The pressure applied to the lamination roll and the backup roll according to claim 1, wherein the pressure applied to the flat roll having an arbitrary diameter is related to the pressure distribution, and the crown having an arbitrary crown amount diameter. A film laminator characterized by being adjusted by measuring in advance the relationship between the pressure applied to the roll and the pressure distribution .   In the thing of the said Claim 1, in what sticks the said film on the single side | surface of the said board | substrate, the said board | substrate is mounted on a plane stand, and each of the said lamination roll and the said backup roll is pressurized. A film laminator characterized by   2. The film laminator according to claim 1, wherein the lamination roll and the backup roll have the same diameter or different diameters.

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