JPH02252586A - Screen printing plate - Google Patents

Abstract

PURPOSE:To make possible highly accurate printing by providing a gauze at a rear frame in printing direction of a plate frame directly or through a thin layer material which has a small tensile elasticity than the gauze, and the gauze at a front frame in printing direction through an elongatable thin layer material with a larger tensile elasticity than the gauze. CONSTITUTION:In a printing plate 11 a gauze 31 with a stencil 30 is directly mounted on a frame 21 which is a rear side in printing direction P of a plate frame 20, it is mounted on a frame 22 which is front in printing direction P via a stretchable thin layer material 33 with a larger tensile elasticity than the gauze 31. Neither of the gauze 31 or the stretchable thin layer material 33 is installed on the lateral frames 23, 24 of the plate frame, so that any of these can be freely mounted. When the gauze 31 is pressed by a squeegee S, the gauze 31 is directly mounted on the rear frame 21 in printing direction P, and the gauze is also mounted on the front frame 22 in printing direction P via the stretchable thin layer material 33 with a larger tensile elasticity than the gauze 31, therefore, if the gauze 31 is pressed by a squeegee S, the pressure applied to the squeegee S is transmitted to the stretchable thin layer material 33 at the forward section of the printing direction P, the stretchable thin layer material 33 is stretched and the deformation of the gauze 31 due to the elongation is restricted.

Description

[Detailed description of the invention] A. Industrial use! The present invention relates to the improvement of gauze among screen printing plates (hereinafter simply referred to as plates).

Explanation of Terms In the present invention, screen and gauze are synonymous with 3g, and printing,
Use the word screen to describe a printing press, etc., and use gauze when referring to a part of a plate or as an independent word.

Also, please include gauze in the thin layer material. Inside the gauze, there is a total of 1 rri8 pieces including metal punching plates for metal masks, metal perforated plates, etc. The tensile elastic modulus is the tensile elastic modulus of stone compared with the original thickness of the gauze or Nl material actually stretched on the frame.

C. Conventional technology In a screen printing machine, the constituent elements of a plate having the function of printing characters and images are a frame, a gauze, and a stencil formed on sand. The requirements for normal printing to be performed through the plate are as shown in FIG. 2, a frame 4 made of gauze stretched with a certain tension is set on the surface of the printing medium 5 at a certain interval,
By applying pressure with the squeegee 6, a folded line aa'b is formed centering on the contact point C with the printing medium 5.

With the kiss of the squeegee 6, the contact point C is quickly peeled off from the printing material 5 due to the tension of the gauze 1 and returns to its original linear position. Here, the fold line tab is a straight line connecting the original position llb twist + l: length (therefore, printing is performed by repeatedly stretching the gauze 1).

In order to ensure the repeatability of printing, the stretching of the gauze is controlled within its elastic limit. However, even with stretching deformation within such elastic limits, when subjected to repeated loads, a creep phenomenon occurs that causes irreversible deformation, and the stencil design gradually shifts position, impairing the repeatability of printing. There is.

In addition, when the gauze is subjected to high stretching, the position of the stencil formed and adhered to the gauze surface is deformed.

21. Problems to be Solved by the Invention As detailed in the previous section, in the current screen printing method, the area around the gauze to which the stencil is formed and adhered is directly fixed under tension to the frame. When subjected to pressure from a squeegee, the 9I4 tension stretching of the - layer is forced, resulting in permanent deformation due to the creep phenomenon, resulting in a decrease in repeat accuracy and the occurrence of positional deformation of the stencil due to the stretching of the gauze. There is.

Therefore, in the present invention, this problem is solved by reducing this extra tj load.

E.9 Means for Solving the Problems As a means for solving the above problems, the present invention provides a composite structure for the gauze portion of the printing plate, and as shown in FIG. The tensile elastic modulus is smaller than that of the gauze 1 to which the stencil is formed and adhered.By providing layer 2, the pressure of the squeegee applied to the gauze 1 is lower than that of the thin layer P152.
We have found a means by which the stretching deformation of the gauze 1 can be kept to a minimum by transmitting this to the stretching position.

To explain the effect with reference to FIG. 1, one end of the gauze 1 made of a material with a high elastic modulus is fixed to the frame 4 or the thin layer material 9, and the other end has an elastic modulus in its total cross section of
It is joined to the N calendar month 142 which is smaller than the gauze 1.

The other end of the thin layer material 2 is fixed to the frame, and the joined body of 1.2 is 2
is fixed to the frame 4 under tension with a force below the elastic limit of the material forming it.

1. This is the gap between the side lines 2 and 9 and the frame 4. 3 is 1.2
The side lines on both sides of and 9 are provided so as not to be directly fixed to the frame 4, and therefore 3 is a space or a thin layer material selected so that the elastic modulus in the entire cross-sectional area is smaller than that of 2. Good too.

In Fig. 3, the stencil is formed on the gauze 1.
is Skill Shiro, facing the printing material 5 to be pressurized,
However, since the gauze 1 is joined to the thin layer material 2Z at the part d, the shearing force trying to stretch the gauze 1 is transmitted to the thin layer 2, and the gauze 1 is not stretched any more. broken line t
ab is formed and contacts the printed body 5 at the portion C, thus making it possible to print the gauze 1 with almost no stretching deformation.

As described above, according to the method of the present invention, the gauze 1 is hardly stretched, deformation due to repeated printing does not occur, and printing with high repeat accuracy can be performed.

The present invention will be explained below with reference to Examples.

1., Example gauze 1 is Shinafuku #635. Messin: & number 63572.54
cmA-Buning 20/J ffi, thickness 48+
m ppJ 2Jum oven area 25% Its tensile modulus is 20xlO tube N/go.

The n-shoulder body 2 has a thickness of 1011 to 1111. It is a natural rubber rate with a tensile modulus of 10 x 105 N/d. The part corresponding to 3 in Figure 1 was left blank.

For the gauze, S of 1llrb and line spacing of 100An each.
A group is formed.

The stencil is glued on. I've done screen printing 1000 times now, and the Azusa 11 line spacing was reproduced correctly even on the final print.

H. Comparative Example In FIG. 4, 1 is the same stainless steel gauze as in Example 1, and 8 is a polyester Teyron N0,200 gauze with a tensile elasticity of 2×10"N/rI11. The periphery is joined to the gauze 8, and the gauze S is fixed to the frame 4 under tension.

The part of gauze 8 where J gauze 1 overlaps is a cutout.

If you print with this configuration in the same way as the actual row, it will repeat 1
00 times, the line spacing became too large.

8. Effects of the Invention As detailed above, the present invention uses composite sand consisting of a set 01i of gauze or N layer materials with different tensile elastic modulus and laths, and further improves the bonding to the printing frame. By the way, Stenno L
Minimize the stretching deformation of the gauze that is bonded, and the line spacing is 11
Even in precision printing of 00A or less, it is possible to achieve repeatable printing accuracy.

[Brief explanation of drawings]

Figure 1 is a plan view of the plate of the present invention, Figure 2 is a side view showing screen printing performed with a conventional plate, Figure 3 is a side view showing printing performed with the plate of the present invention, and Figure 4 is a side view showing screen printing performed with a conventional plate. , is a plan view of a conventional version compared with the version of the present invention. Figure 1 Figure 3 (Side view) Figure 2 (Side view) Figure 4

Claims (1)

[Claims] In Figure 1, the gauze (
One end of 1) is fixed to the frame (4) or to a thin layer material (9) whose tensile elastic modulus is equal to or larger than that of the gauze (1) in the total cross-sectional area, while the end of the gauze (1) The other end has a tensile elastic modulus of gauze (1) in the total cross-sectional area.
The other end of (2) is fixed to the frame (4), and the gauze of the thin layer material (9) (
The end opposite to 1) is fixed to the frame (4), and on both sides of the gauze (1) and thin layer materials (2) and (9), other thin layer materials (
3) is present or absent, and the thin layer material (
One end of 3) is connected to (1), (2), and (9), and the other end is connected to frame (4), and the tensile elastic modulus in the total cross-sectional area is smaller than that of (2). Naru screen printing version