JPH0345394A - Improved type screen printing plate - Google Patents

Abstract

PURPOSE:To prevent the generation of an error at the time of printing and to obtain a screen printing plate having long life by fixing one end of the screen printing plate being a non-elastic body to the fixing frame on the moving start side of a squeezee. CONSTITUTION:In a screen printing plate 3 wherein a stencil 31 being non-elastic in a tensile direction is bonded to a planar shape body 32 having elasticity, the non-elastic stencil 31 and the planar shape body 32 are fixed to the circumferencial fixing frame 4 on the moving start end side of a squeezee 2. As the non-elastic stencil 31, a mesh, a metal plate or a synthetic resin plate having no elasticity or extremely low in elasticity is used. As the planar shape body having elasticity, a planar shape one having elasticity in a tensile direction such as a screen mesh or a rubber plate is used. When the squeezee 3 is moved only to the non-elastic stencil part from the fixing frame, the stretching in the screen printing plate is entirely undertaken by the planar surface part having elasticity and the non-elastic stencil is not stretched at all or stretched extremely slightly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in screen printing plates used in screen printing.

Screen printing is performed using a screen 30 as shown in FIG.
The four circumferences of the (mesh-like fabric) are fixed under tension to the plate frame 4, and a plate film (regis l-) is created manually or photochemically on top of the plate to form a shallow ark shape. By applying the used intraocular screen printing ink and rubbing the surface of the printing plate with pressure using the squeegee 2, the ink is pushed from the part where there is no printing film through the surface of the screen 30 and onto the surface of the printing material placed on the bottom surface of the printing plate. Printing is done by printing.

Screen printing allows the use of many types of ink, and because the ink layer is thick, it has excellent weather resistance and chemical resistance.For this reason, in recent years it has also been used for printing substrates such as IC circuits. .

As shown in FIG. 2, the printing plate 3 used for this purpose is fixed under tension by a rigid fixing frame 4 around the four circumferences of the screen 30, and a plate with a pattern 33 drawn by hand is placed on top of this. membrane was used.

Figure 3 shows how the screen printing plate 3 is moved by the movement of the squeegee 2.
It is a sectional view showing the process of extruding ink from the
FIG. 4 is a cross-sectional view showing the state in which the squeegee has returned to its original position without printing. In printing as shown, the paper is forcibly expanded by being pressed by the squeegee 2, compared to non-printing as shown in FIG.

However, in conventional screen printing plates, elastic errors, geometrical dimensional errors, fatigue errors, etc. inevitably occur.

To explain this individually, in the screen printing plate shown in FIG. 5, assuming that the elastic modulus of the screen printing plate 3 constituting the printing plate is constant over the entire surface, the squeegee 2 will move a when not printing, In the case of positions b and c (however, the position l] shall be at the center equidistant from the fixed frames on both sides), the tip of the squeegee 2 and the pattern on the screen printing plate 3 at position b are , during printing, it moves to a position b° located directly below b on the printing medium 6.

On the other hand, if the squeegee is at position a or C,
Because the amount of elongation of the screen printing plate 3 on both sides of the squeegee is different (in the case of position a, the right side of the screen printing plate 3 elongates more, and in the case of C, the inner side of the screen printing plate 3 (The part will expand more.)
, when printing, the position of squeegee 2 is ao slightly to the right of a.
As a result, the position of C is shifted further to the left side of Co, but this is a so-called elastic error.

Also, the side where the squeegee 2 starts moving (b in Fig. 5)
, left side of squeegee 2), the printed pattern shows a tendency to shrink, whereas on the rear side of squeegee 2 (left side of squeegee 2)
In the part to the right of b', the printed pattern tends to extend little by little.

During printing as shown in FIGS. 4 and 5, the expansion and contraction of the pattern is affected by the degree of expansion of the mesh of the screen on the ink-holding side of the squeegee 2, but the position of the squeegee in the first half of printing [ 1 in Figure 5]
, left side of the screen printing plate 3), the shorter left side of both sides of the screen printing plate 3 pressed by the squeegee expands significantly, while the right side does not show much expansion, and the squeegee Position (in Figure 5, b
This is because the content side portion of the stencil surface pressed by the squeegee 2 expands significantly, while the left side portion does not expand as much.
Errors caused by expansion and contraction of the pattern depending on the position of the squeegee are so-called geometric dimensional errors.

Furthermore, as the number of printing increases, the stencils forming the screen printing plate gradually elongate, resulting in a dimensional error in the printed pattern, which is a so-called fatigue error.

As described above, when conventional screen printing plates are used, the above-mentioned errors inevitably occur.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, in screen printing, as shown in FIG. In the screen printing plate 3 in which a planar shape body 32 having elasticity in the direction is combined, the inelastic stencil 31 and the planar shape body 32 are fixed to the movement start end side of the squeegee within the surrounding fixed frame 4. We decided to use an improved screen printing plate that is characterized by:

That is, in the screen printing plate, the part surrounded by the fixed frame is divided into an inelastic part and an elastic part, and one of the inelastic parts is fixed to the fixed frame located on the side where the squeegee starts moving.

In this case, "inelastic" means having no elasticity at all, or having extremely less elasticity than conventional screen mesh stencils, which have elasticity. Usually, a mesh with extremely low elasticity, a metal plate, a metal plate, a synthetic resin plate, etc., which has a portion that transmits the ink necessary for printing on a hard synthetic resin plate, is used.

In addition, the above-mentioned mesh that does not have elasticity or has extremely low elasticity is usually impossible to create with conventional meshes woven from synthetic resin wires or metal wires, and has no elasticity or extremely low elasticity. A mesh in which mesh-like holes are optically formed in a gold plate, a synthetic resin plate, etc. is appropriate.

On the other hand, the elastic surface may be not only the conventionally used screen mesh but also any flat surface that is elastic in the pulling direction, such as a rubber plate.

(Function) In the improved screen printing plate with the above configuration,
When the squeegee is moved from the fixed frame to only the non-elastic stencil part, as shown in Figure 7, all the elongation of the conventional screen printing plate is carried out by the elastic flat part, and the non-elastic stencil part The stencil will require no or very little stretching.

As a result, the stencil surface itself, which is an inelastic body, has no or very little room for elastic errors, geometric errors, fatigue errors, etc., as in the conventional case.

(Effects) As described above, the improved screen printing plate according to the present invention does not cause any misprinting errors during printing, and only <vl'f
You can get screen printing plate with long life and
Such a screen printing plate itself combines a stencil, which is a non-elastic body, and an elastic surface, and one end of the screen printing plate 3, which is a non-elastic body, can be fixed to a fixed frame on the side where the squeegee starts moving. Therefore, the manufacturing method is extremely simple and extremely economical.

From the above, the improved screen printing plate of the present application has great utility value in terms of printing accuracy and economy.

[Brief explanation of drawings]

Fig. 1: A sketch showing the structure of Ni-screen printing Fig. 2: A plan view showing the structure of a conventional screen printing plate Fig. 3: A sectional view showing the operating state of Ni-screen printing Fig. 4: In Ni-screen printing, the squeegee moves the mesh Fig. 5 is a cross-sectional view showing the unpressed state; Fig. 5 is a cross-sectional view showing that elastic errors inevitably occur in the stencils constituting the conventional screen printing plate; Fig. 6 is a plan view showing the structure of the present invention; Fig. 7 : Plan view screen printing machine showing that in the present invention, the elongation of the surface is performed on the side of the elastic planar body, and such elongation is not performed on the stencil made of an inelastic material. 2. Squeegee screen printing plate inelasticity 5. Partial printing material that grips the stencil frame 7. Ink screen printing stand

Claims (6)

[Claims] (1) In a screen printing plate that combines a stencil that is inelastic in the direction of tension and a planar object that is elastic in the direction of tension, the inelastic stencil and the planar object are placed within a surrounding fixed frame. , an improved screen printing plate characterized by being fixed to the movement start end side of the squeegee. (2) The improved screen printing plate according to claim (1), which uses a stencil made of an inelastic mesh. (3) The improved screen printing plate according to claim (1), characterized in that a metal plate having incisions for ink-transparent parts is used as a stencil. (4) Claims characterized in that a synthetic resin plate with ink-transparent parts cut out is used as a stencil (
1) Improved screen printing version as described (5) The improved screen printing plate according to claim (1), characterized in that an elastic mesh is used as the planar body having elasticity. (6) The improved screen printing plate according to claim (1), characterized in that a rubber plate is used as the elastic planar body.