JPH10202823A - Screen printing unit and screen holding frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable application of a plating operation to a screen by a method wherein a screen holding frame is formed of a titanium alloy, surface-treated aluminum or the like, the screen is stretched on this screen holding frame and fixed thereon by a presser plate and then the screen is subjected to a dulling treatment of the plating operation or the like. SOLUTION: A channel-like screen holding frame 1 is formed of titanium or a titanium alloy, a large number of screw holes are bored therein and the corner parts thereof are welded. Corresponding through holes are bored also in a presser plate 3 made of the titanium alloy and the frame and the plate are fixed by screws 4 driven into the screw holes. On the occasion when a screen 2 is stretched on the screw holding frame 1 by a stretcher, the peripheral edge part of the screen 2 is made hard by an adhesive or a tape so as to be prevented from being torn by the screws 4 inserted. In order to subject the screen 2 to a dulling treatment, subsequently, the whole of it is immersed in an electroless copper plating tank and the surface of each fiber is subjected to dull nickel plating or dull chrome plating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing unit used for a ceramic substrate or the like requiring a high resolution. In particular, the present invention provides a screen holding frame capable of plating a screen stretched on the screen holding frame.

[0002]

2. Description of the Related Art A screen is stretched on an aluminum frame with a stretcher and fixed by bonding. Protect the aluminum frame and the adhesive part with tape to improve solvent resistance. This re-printing operation to remove the screen must remove the adhesive that has firmly adhered to the aluminum surface. Further, when a photosensitive emulsion is applied to the screen and the pattern film is brought into contact with the film to irradiate light, the pattern accuracy (sharp edge) is reduced due to irregular reflection (halation) from the fiber surface of the screen itself. As a countermeasure for this, the screen is plated black, but the plating film cracks due to the tensile force at the time of stretching.

[0003]

In order to plate a screen stretched on a screen holding frame, a screen holding frame having excellent chemical resistance is required. Conventional aluminum frames are not suitable. It is a feature of the present invention to employ a screen holding frame having excellent chemical resistance such as a titanium alloy. The details will be described below with reference to the drawings.

[0004]

[Means for Solving the Problems] A screen holding frame is formed of titanium alloy or surface-treated aluminum, etc., the screen is stretched on the screen holding frame, fixed with a pressing plate, and the screen is plated. Performs matte treatment.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A channel-shaped screen holding frame 1 is formed of titanium or a titanium alloy (hereinafter referred to as a titanium alloy). A number of screw holes 5 are drilled in the screen holding frame 1 and their corners are welded (FIG. 3). A through hole corresponding to the pressing plate 3 made of a titanium alloy is also formed. Both are fixed by screws 4 screwed into the screw holes 5 (second
Figure). Anodized or plated aluminum is used instead of titanium alloy. Surface treatment of conventional extruded aluminum frame to enhance chemical resistance (solvent resistance). When the screen 2 is stretched on the screen holding frame 1 with a stretcher, the peripheral edge of the screen 2 is hardened with an adhesive or a tape. It prevents tearing by the inserted screw 4. Next, the whole screen is immersed in an electroless copper plating bath in order to make the screen 2 dull, and the surface of each fiber is plated with black nickel or black chrome. In the case of electroless nickel plating, a black nickel plating film is formed. Even if the screen printing unit of the present invention is immersed in the acid cleaning / alkali cleaning solution and the plating solution of the pre-plating treatment, no problem occurs due to the use of the screen holding frame made of a titanium alloy or the like.

[0006] It is also possible to use an adhesive having a low adhesive strength but excellent in chemical resistance and peeling properties (peeling). It is applied to the lower surface of the pressing plate 3 and screwed (FIG. 2). Instead of using the pressing plate 3, an adhesive may be applied to the peripheral portion of the screen as in the related art. Since the adhesive hardly solidifies on the screen holding frame 1, the reprinting operation can be performed simply by removing the pressing plate 3. As the matte treatment of the screen 2, a film forming method such as electrostatic coating, a conductive polymer, and vacuum deposition is appropriately adopted.

[0007]

According to the present invention, the screen holding frame 1 is formed of a titanium alloy or surface-treated aluminum or the like, the screen 2 is stretched on the screen holding frame, and is fixed by the pressing plate 3. By applying a matte treatment such as plating, halation in the exposure process can be significantly reduced, a sharp pattern can be formed on the screen, and high-precision printing has become possible. Further, the reprinting operation can be performed simply by removing the pressing plate 3, and the troublesome removal of the adhesive stuck to the screen holding frame 1 as in the related art is unnecessary. By employing a titanium alloy or the like having excellent chemical resistance for the screen holding frame 1, the screen 2 can be plated.

[Brief description of the drawings]

FIG. 1 is a front view.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram of a screen holding frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screen holding frame 2 Screen 3 Pressing plate 4 Screw 5 Screw hole

Claims (5)

[Claims] 1. A screen holding frame 1 is formed from a titanium alloy, surface-treated aluminum or the like, a screen 2 is stretched on the screen holding frame, fixed with a pressing plate 3, and the screen 2 is formed by plating or the like. Screen printing unit for matte processing. 2. A large number of screw holes 5 are formed in the screen holding frame 1, and screws 4 extending from the pressing plate 3 are screwed into the screw holes 5. 2. The screen printing unit according to claim 1, wherein the portion is pre-taped or cured with an adhesive or a curing agent. 3. A screen 2 is stretched on a screen holding frame 1 having excellent chemical resistance, such as a titanium alloy or anodized aluminum, and a peripheral portion of the screen is fixed to the screen holding frame with a pressing plate or the like. A screen printing unit that processes the entire surface with a chemical treatment solution or plating and matte the screen. 4. A screen holding frame formed by forming a channel-shaped frame from a titanium alloy or surface-treated aluminum and forming a plurality of screw holes 5 for fixing a pressing plate. 5. A screen 2 is stretched on a screen holding frame 1 having excellent chemical resistance, such as a titanium alloy or anodized aluminum, and the periphery of the screen is fixed to the screen holding frame with an adhesive. A screen printing unit that immerses or plating in a chemical processing solution to make the screen matte.