JPH03236995A - Press plate for flexure printing - Google Patents

Abstract

PURPOSE:To adapt a press plate to flexure printing by using no fixing frame surrounding four peripheries of the printing plate with respect to a plate film having ink transmitting perforations and hard to deform against the tensile force in the plane direction thereof and having flexibility against bending. CONSTITUTION:A fixing frame surrounding four peripheries is not used with respect to a plate film 3 having ink transmitting perforations, hard to deform against the tensile force in the plane direction thereof and having flexibility against bending. On the assumption that one end part or both end parts of the press plate 3 is moved along with the movement of a squeezee 2 at the time of printing in the printing plate for flexure printing, supports 41, 42 are provided for the sake of this movement and there are such a case that the supports move holders 11, 12 and such a case that the end parts of the press plate 3 are moved along the holders without especially providing the supports. Printing is performed while the press plate is made freely bendable and deformable with the movement of the squeezee 2 because of its flexibility and, since the expansion and contraction of the press plate in the plane directions is difficult, the distortion of a pattern due to the expansion and contraction of the press plate is avoided and the generation of ink irregularity between the central part and end part of a screen press plate can be also avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field and Object of the Invention) The present invention relates to screen printing plates that can be applied to improved screen printing machines that have already been proposed in the field of screen printing (as will be explained later). These printing plates have come to be called ``flexure printing plates.''

).

Generally, printing plates used in screen printing have ink permeation holes in a desired pattern shape for printing, and there are two types of printing plates: those that have ink permeation holes covered by a mesh and those that do not. .

In general, the ink permeable holes are covered with a mesh when there is an isolated part 31 of the plate part 31 of the printing plate surrounded by the ink permeable holes 33 as shown in FIG. It is necessary to connect the outer part of the printing plate and the isolated part with the mesh 32 (on the contrary, if the outer part of the printing plate is not joined with the mesh 32, the isolated plate part 31 of the printing plate will come off, and this part will also be ink permeable). If the area of the ink permeation hole is large, a large amount of ink will pass through this area and penetrate into the surface of the printing material, resulting in an overly concentrated ink concentration.
This is due to the ink seeping into the boundaries of the ink permeation holes and creating poorly defined ink stains on the printing substrate.

Therefore, there is no isolated part as described in (■) above,
If the area of the ink permeation hole is not very large, it is not necessary to cover the ink permeation hole with a mesh.

By the way, the screen printing plate used conventionally has a screen mesh of 4 as shown in Fig. 2(a).
Alternatively, as shown in FIG. 2(b), the metal plate having ink permeable holes can be fixed by four fixing frames. 4.

In the conventional screen printing plate, as shown in Fig. 3, the screen printing mesh and the printing plate are fixed to a shallow ark-shaped support frame, and the screen printing plate 3 is coated with an optical method or a physical method. A desired pattern was formed by a method, ink was poured onto the screen printing plate, and printing was performed by applying pressure with a squeegee 2.

Conventional screen printing plates are shown in Fig. 2(a) and 2(a).
b) As shown in the figure, the reason why the four circumferences are fixed by the fixing frame 4 is to prevent the edges of the printing plate from moving due to the pressure applied by the squeegee 2.

In this case, in the printing plate that supports the metal plate through the mesh shown in FIG. 2(a), during printing, the mesh and the printing plate are moved onto the substrate 6 by the squeegee 2 as shown in FIG. 4(a). In contrast to being pressed and forcibly elongating, when printing is not being performed, the mesh and printing plate are required to be separated from the printing substrate 6 as shown in FIG. 4(b). Generally speaking, the lengths of the mesh and the printing plate in the surface direction are required to be different during printing and non-printing.

However, this expansion and contraction of the screen in the surface direction means that the screen printing plate itself gradually stretches as the number of printing increases, causing dimensional errors in the printed pattern.
Furthermore, even after printing is completed, the screen printing plate may not be able to fully touch the surface of the printing material (so-called printing plate separation failure).

On the other hand, even during printing as shown in FIG. 4(a), as the squeegee moves to the edge of the printing medium, the case where the squeegee is located at the edge of the printing plate is different from the case where the squeegee is located at the center of the printing plate. (This point is clear from the fact that the length of the mesh is larger when the squeegee is located at the end than when the squeegee is located in the center.) ), the pattern becomes larger near the edges of the printing plate, which causes uneven ink density.

Also, as the squeegee moves to one end, the snap-off angle between the screen and the printing material (by α in FIG. 4(a)) changes on the side opposite to the side where the squeegee holds ink. ) gradually became smaller, making it more difficult for ink to pass through compared to the center of the printing material, and this change in angle also caused uneven ink density on the printing material. .

In a screen printing plate in which a printing plate having a desired pattern is directly fixed by a fixing frame as shown in FIG. 2(b), the printing plate is in full contact with the printing material ( contact) and scan the flat printing plate with a squeegee, or as shown in Figure 4(a), as in the case of a printing plate that supports a metal plate through a mesh, a squeegee 2, a method was used in which the metal plate was forcibly pressed against the printing material 6.

However, in the contact method shown in Figure 5, even after the squeegee scans, it does not separate from the printing plate or the printing material, so the ink remaining on the ink permeation holes gradually penetrates into the printing material. Clear printing cannot be obtained due to ink stains in the border area, etc.
Furthermore, when a printing method as shown in Figure 4(a) is used for a printing plate, the printing plate is forcibly stretched with a squeegee, even though the printing plate itself is difficult to stretch against tension in the surface direction. This may damage the printing plate or deform the fixing frames in both directions, and as the number of printings increases, the shape of the ink permeation holes will change, making precise printing impossible.

In order to improve this problem, as shown in Figure 6, at the tip P of the squeegee, the screen on the side opposite to the ink holding side is set so that the snap-off angle α is constant. Providing a guide 11 in which the end portion A moves, or as shown in FIG. Guides 11 and 12 are provided so that the ends A and B of the screen move so that the snap-off angle α is -
・The end of the screen opposite to the side that holds the ink can be moved along a linear guide so that the other end of the screen can be moved reversibly with the movement of the squeegee. It has been invented and has already been filed with the government.

In these improved screen printing machines, both ends of the printing plate are movable, so it is not necessary to expand and contract in the surface direction like the conventional printing plate, but it also eliminates the drawbacks mentioned above. This is a negative point in that it causes

On the other hand, since the printing plate for screen printing is pressed against the printing surface by a moving squeegee, flexibility is required as in the case of conventional printing plates.

Thus, in the improved screen printing machine as described above, it is essential to use a screen printing plate that is not easily deformed by tensile force in the in-plane direction, and at the same time has flexibility. However, printing that uses such a screen printing plate and is performed while moving the edges of the screen printing plate has already been defined as "flexure printing."

The object of the present application is to provide a flexure printing plate that can be applied to such flexure printing.

(Means for Solving the Problem) For a printing plate using a material that has ink permeation holes in a desired pattern shape, is difficult to deform under tensile force in the linear direction, and is flexible against bending, It consists of a printing plate for flexure printing that is characterized by not using a fixed frame surrounding four peripheries.

This will be explained in detail below.

The flexure printing plate of the present invention is shown in FIG. 2(a),
This is a printing plate using a plate film that can be applied to flexure printing without using a fixed frame surrounding the four peripheries as shown in Figure 2 (b), but this is a printing plate that uses a plate film as shown in Figures 6, 7, and 8. This is because in flexure printing as shown in , there is no need to fix the printing plate with a plate frame.

In this type of flexure printing, since the printing plate easily expands and contracts in the plane direction, which makes accurate printing difficult, it is required that the printing plate is difficult to deform in the plane direction (ideally, it should not be deformed). be done.

For this reason, a metal plate or a synthetic resin plate whose surface is plated with metal is used as the plate film.

These metal plates and synthetic resin plates are required to be bendable in the normal direction of the surface and to have flexibility, as in the case of conventional screen printing plates.

By the way, the flexure printing plate of the present application is based on the premise that one end or surface end of the printing plate moves with the movement of the squeegee during printing. ) Supports 4L 42 are provided at opposite ends as shown in FIGS. 6, 7, and 8.
When moving the holders 11 and 12 shown in the figures, etc.,
(b) As shown in Figure 9(b), there are cases where no holder is provided and the edge of the printing plate is moved along the holder (in the case of the embodiment shown in Figure 9(b), the edge of the printing plate is moved along the holder). Either a hole is provided at the end and the holder penetrates through the wire hole, or a grip is provided to connect the end of the printing plate and the holder, but in either case, the end of the printing plate is solid and does not deform. ).

That is, the flexure printing plate of the present application has both embodiments in which the supports 41 and 42 are provided at both end portions and in which the supports 41 and 42 are not provided.

(Operations and Effects of the Invention) In the flexure printing plate of the present application having the above configuration, the fourth circumference is not surrounded by the fixed frame, so the sixth
It can be immediately applied to flexure printing as shown in FIGS. 7 and 8.

In other words, due to the flexibility of the printing plate itself, it is possible to perform printing while bending and deforming as the squeegee moves, and since it is extremely difficult to expand and contract in the plane direction, the printing plate can be easily expanded and contracted. Not only can pattern distortion caused by this method be avoided, but also the occurrence of ink unevenness between the center and edges of the screen printing plate as described above can also be avoided.

For this reason, when used in flexure printing as shown in Figures 6, 7, and 8, it is possible to print with extremely high resolution, and when forming IC circuits etc. by printing, the function is greatly improved. can demonstrate.

Furthermore, unlike conventional screen printing plates, the mesh does not expand or contract during printing, so the mesh itself has a long lifespan and is economical.

As described above, the present invention has an epoch-making significance in the field of screen printing, and the value of the invention is extremely great.

[Brief explanation of the drawings] Figure 1: When the plate part of the printing plate constituting the printing plate is surrounded by ink permeation holes, in order to support the plate part,
Plan view showing the necessity of mesh Figures 2(a) and 2(b): Schematic diagram of a conventional screen printing printing plate Figure 3: Schematic diagram showing the mechanism of conventional screen printing Figure 4(a) ) Figure 4(b): A sectional view showing the operating state of conventional screen printing Figure 5: In the screen printing plate shown in Figure 2(b), the printing plate is completely applied to the substrate Cross-sectional diagrams showing the printing method by contacting 12 Figures 6, 7, and 8: Cross-sectional diagrams showing the principle of improved screen printing Schematic drawings 11 and 12 showing examples with and without supports at the ends of the printing plate, holder 2 in which support stands at both ends of the screen move in an improved screen printing machine, squeegee 3, screen Constituent mesh and printing plate 3
1. Plate part of the printing plate 32. Mesh 33. Ink permeation holes 4. Fixed frame used in conventional screen printing 41. 42. Support 5. Grip the fixed frame used in conventional screen printing. Part 6: Printing material 7: Support stand

Claims (1)

[Scope of Claims] (1) For a plate film using a material that has ink permeation holes in a desired pattern shape, is difficult to deform under tensile force in the plane direction, and is flexible against bending, A flexure printing plate (2) characterized in that a fixed frame surrounding the four peripheries is not used; a flexure printing plate (3) according to claim (1), characterized in that the plate film is a metal plate; ) The printing plate for flexure printing according to claim (1), wherein the plate film is a synthetic resin plate whose surface is plated with metal. (4) Supports for movement at both opposite ends of the plate film. A flexure printing plate (5) according to claim (1), characterized in that a support body is provided at both opposing ends of the plate membrane (5). 1) Flexure printing plate mentioned above