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Terminology of screen properties

2022-12-03 Hot:233 ℃

1. Wire mesh

The screen is a woven fabric used as the support of screen printing plate. Custom I silk screen, silk screen, gauze screen, screen, etc.

2. Number of mesh

The mesh number of wire mesh refers to the number of meshes per square centimeter (cm2) of wire mesh. The unit used to express the mesh number in the screen product specification is hole/cm or line/cm. Countries and regions that use imperial measurement units express the mesh size in holes/inches or lines/inches. The mesh number can generally indicate the density between the wires of the screen. The higher the mesh size, the denser the wire mesh, and the smaller the mesh size. On the contrary, the lower the mesh number, the thinner the mesh, and the larger the mesh size, such as 150 mesh/inch, that is, there are 150 mesh wires within 1 inch. The smaller the mesh, the ink

The worse the trafficability, the larger the mesh, and the ink

The better the trafficability. When selecting the screen, you can select different mesh sizes according to the precision requirements of the printing.

3. Wire mesh thickness?

Screen thickness refers to the distance between the screen surface and the bottom, usually in millimeters (mm) or micrometers( μ m) Measurement. The thickness shall be the measured value of the screen when it is standing under no tension. The thickness is determined by the diameter of the screen, and the amount of ink passing through the screen is related to the thickness.

4. Opening of wire mesh

The mesh opening is an important parameter used to describe the mesh width, aperture and mesh size. The opening of the screen has a great influence on the fineness of the pattern and characters of screen printed products. The opening actually represents the width of the mesh, which is expressed by the square root of the mesh area enclosed by the longitude and latitude lines of the mesh (usually in microns, 1 micron=1/1000mm). Therefore, the longer one side of the mesh is, the larger the opening is. However, with the same opening, due to different materials and operation methods for weaving the screen

The effect is good and bad.

The opening can be calculated as follows:

O=A1/2(ab)1/2

Where: O - opening( μ m);

A - mesh area;

a. B - width of adjacent sides of mesh;

L - unit length for measuring mesh number of wire mesh, 1cm for metric unit of measurement, 1 inch for imperial unit of measurement, 1 inch=2.54cm;

M - mesh number of wire mesh;

T - Wire diameter of wire mesh.

5. Wire mesh opening rate

The mesh opening rate is also called the mesh through porosity, effective screening area, percentage of mesh area, etc., that is, the percentage of mesh area in the unit area of the mesh. As shown in Figure 2-1, the opening ratio can be calculated as follows:

Opening ratio=(a × b)/(C × D) × 100%=[SX(]a × b[](a+T)(b+T)[SX)] × 100%

Where: a × B - mesh area;

C × D - Wire mesh area;

T - Wire diameter of wire mesh.

6. Inking amount of screen

In actual printing, the amount of ink passing through the screen is affected by the material, performance and specification of the screen, the viscosity, pigment and other components of the ink, the type of the substrate, the hardness, pressure and speed of the scraper, and the gap between the plate and the substrate. Therefore, there is no definite standard. Generally, the assumed penetration volume is called the ink volume.

7. Terminology of screen performance

(1) Density. Also called screen density and fabric density. That is, the number of filaments (lines) in the unit length of the warp and weft direction of the screen. The number of warp filaments in the unit length of the weft direction is the density of warp filaments, and the number of weft filaments in the unit length of the weft direction is the density of weft filaments. When the warp density of the screen is equal to the weft density, the screen density is equal to the mesh number stated in the screen specification.

(2) Breaking strength

。 The maximum force that the wire mesh sample (generally 20cm long and 5cm wide) resists to fracture in the tensile test can be expressed as gf (gram force), kgf (kilogram force), N (Newton), etc.

(3) Elongation at break. The elongation of the wire mesh sample when it is stretched to the maximum load fracture.

(4) Elongation at break. Percentage of the elongation at break of the wire mesh sample to the length before tension of the sample.

(5) Elasticity. The wire mesh deforms under external force. After the external force is removed, the deformation disappears and the performance of the original shape can be restored.

(6) Slow elasticity. The wire mesh will deform under external force, the external force will be removed, and the performance of the original shape can be restored after a considerable period of time.

(7) Antistatic performance. The performance of the screen to resist the generation or accumulation of static electricity.

8. Wear resistance

Sex. Resistance of wire mesh to external force wear. Generally, it is expressed in terms of the number of times the sample is broken by repeated abrasion, or the degree of change in appearance, strength, thickness, weight, etc. after a certain number of abrasion.


TAGS: mesh

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