In order to obtain an image with high uniformity and high resolution, it is necessary to ensure that the opening of the penetrating ink is wider. The area occupied by the opening in the unit area of ​​the screen is determined as the aperture ratio. This value depends on the wire diameter and the number of wires per inch, which depends on the weaving density. If the wire diameter and weaving density are small, the aperture ratio is high, but from the perspective of the implementation possibilities of weaving and plate making, practical synthetic fiber screens are designed separately.

Although metal wire can be used to make screens and metal plates can be used to make thin screens, due to the unique plastic deformation of the metal, the intersection of warp and weft will damage the substrate and cause film defects.

Vecry (trade name) developed by Clarion Company uses a polyaryl compound of a hot-melt liquid crystal polymer as the core component and a flexible polymer polyethylene naphthalene as the sheath component, which is a composite fiber of the core sheath. Generally, the breaking strengths of polyester and stainless steel are 1.01 and 0.74, respectively, and Vecry is 2.21, which is a high-strength fiber with twice the breaking strength.

The liquid crystal polymer fiber is a highly crystalline oriented filament structure. On the other side of the orientation strength is strong, there is delamination, twisting, bending, and space between the filaments, so the bonding between the filaments is weak. When vertical stress is applied upwards, it is easier to cause dislocation or slippage between filaments.

Furthermore, Vecry, whose core component is composed of hot-melt liquid crystal polymer fibers, is liable to be staggered and slipped between filaments, but it can be made into a thin film, so it is specially tried to apply to the ultra-thin film screen in screen printing . Due to the use of Vecry with high breaking strength, plastic deformation and stability, a thin screen with high aperture ratio for ultra-thin film printing was finally developed.

1. Experimental method 1. The material wire mesh is woven with Vecry. The substrate is a soda glass sheet formed with an ITO film of 1.50mN, which is cleaned after corona discharge treatment. The solid content in the ink can be used as the light-emitting layer of the organic EL. Isophorone was used as a solvent.

2. Fabrication of screens Five types of screens with a braid density of 130 (23 μm), 160 (45 μm), 200 (23 μm), 250 (30 μm), and 330 (23 μm) were tested. Within the brackets is the wire diameter of Vecry used for each braid density. After weaving, various wire meshes are made thin by calendering.

3. Evaluation of the physical properties of the wire mesh For the measurement of the breaking strength of the wire mesh, Autogragh (DCS-100 type, manufactured by Shimadzu Corporation) was used. The sample shape at the time of measuring the breaking strength was defined as a short book shape, with a width of 50 mm and a chuck interval of 200 mm. The calculation of the aperture ratio was based on the wire diameter and the opening area measured by the length measuring machine. For the thickness measurement of the wire mesh and the surface observation of the wire mesh, use a thickness meter (manufactured by MG-4 Prolot), and the observation of the fiber cross section using a scanning electron microscope (JSM-7401F, produced by Japan Electronics Data Corporation). Observation uses a scanning electron microscope (5-4700, manufactured by Hitachi, Ltd.).

4. Fabrication of screen plate. Tighten the screen with a deflection angle of 22.5 ° and a tension of 146N / cm. Fix it with a rubber adhesive on an aluminum frame of 320mm × 320mm. After the tension is stable, wash the surface and apply diazo. The photosensitive resin was dried several times, forming a photosensitive resin coating film of about 5 μm together with the thickness of the screen, and then exposed and developed to form a 40 mm × 40 mm pattern.

5. Using screen printing to form a thin film screen printing machine uses the MT-2026Z made by Microtech. The distance between the plate and the substrate is fixed at 1.5mm. The printing pressure is set to 269mN / mm or 376mN / mm to suit the purpose of the test.

The scraper speed was set at 200mm / s or 30-300mm / s. The effect of speed was tested. The scraper used a thickness of 9mm, a width of 70mm, a hardness of 70, a sword-shaped urethane rubber, and its top was 30 ° from the plate. Angle.

The ink used is PVCz, Bu-PBD, C6, dissolved in the solvent isophorone at a ratio of 160: 40: 1, adjusted as a solid component to a mass fraction of 12.

6. Evaluation of the film Regarding the thickness of the film, the center of the 40 mm × 40 mm pattern and 3 points of 10 mm from the center to the front and back of the printing direction were measured using a DEKTAK3030ST stylus surface shape measuring instrument made by AlbaokYes.

An atomic force microscope (AFM) manufactured by Seiko Instruments Inc. was used to evaluate the surface characteristics as an index of uniformity.

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