What are the three elements and the plus one in screen printing?
The plate, ink, and squeegee are said to be the three elements of screen printing, and they are important points. As a plus one element, the substrate (workpiece) on which ink is applied is another important element.
What is the most important of the three elements of screen printing?
Ink is the most important aspect of printability in screen printing. The ink and printed material (workpiece) have a function and remain until the end. Since these two determine the characteristics of the product, we try to determine the conditions with the remaining plate and squeegee, but whether or not it can be printed is determined by the ink.
What is "paste rolling" in screen printing?
The rotation of the paste between the plate and the squeegee. If this rotation is not stable, the paste will not come out stably from the plate.
What is "plate separation" in mesh screen printing?
A clearance (gap) is taken in the mesh version. At this time, it means that the plate separates from the printed material (work) immediately after transferring the ink with the squeegee. This separation must follow the movement of the squeegee and be separated sequentially.
What is "clearance (gap)" in screen printing?
The gap between the plate and the material to be printed (workpiece) that is necessary for good printing (and separation of the plate).
How does the ink come off in mesh screen printing?
Ink entangles in the mesh of the plate and competes with the printed material (work). At that time, the pushing force of the squeegee and the rolling of the ink push the ink onto the material to be printed (work), and the tension of the plate tears off the ink, which transfers the ink to the material to be printed (work). Understanding how the ink comes out is important for solving printing conditions and printing problems.
There are three common types: flat, square, and sword.
What is the material of common squeegees?
In general, what is called urethane rubber is the mainstream, and even with the same urethane rubber, there are differences in the characteristics of each company's rubber by slightly changing the compounding.
In addition, there are silicone rubber, synthetic rubber, metal, plastic, etc., but they should be considered special.
What shape is most used in the mesh version?
A flat squeegee.
Some companies use square or sword-shaped squeegees, but flat squeegees are generally used. We also recommend a flat squeegee because it can be re-polished and the squeegee edge can be kept constant.
What is the hardness of Squeegee Rubber?
The three basic types are 80, 70, and 60 degrees.
There are 90 degree rubbers and rubbers with increments of 5 degrees, but there are many variations in rubber hardness, and rubber manufacturers say that the variation in hardness is about ±5 degrees.
Currently, our company controls the hardness of rubber within -0 to +5 degrees.
The hardness of Squeegee Rubber is expressed in Hs (Shore) hardness with a JIS K6031 standard hardness tester.
What is the attack angle of the squeegee?
It is the mounting angle of the squeegee when printing.
What is the amount of ink ejected from a general plate when the squeegee is set at an upright attack angle and when it is laid down?
The amount of ink ejected decreases when you stand it upright, and increases when you lay it down.
Looking only at the hardness of Squeegee Rubber, is it better to print sharp lines with a harder hardness or a softer one?
Harder hardness of Squeegee Rubber is better.
What is the elastic force of a squeegee? (common name: waist strength)
Apart from the hardness of the squeegee, it is the degree of deflection of the squeegee rubber when force is applied to the flat squeegee at a certain angle.
It is usually perceived intuitively. Even with the same urethane, the stiffness varies depending on the manufacturer and type of squeegee, which also affects printability.
What is the solvent resistance of the squeegee?
It refers to the extent to which squeegee rubber can withstand solvents, etc. contained in ink, and how it changes as rubber.
As a method, put pieces of squeegee rubber in the solvent for about 24 hours, and see the state of erosion of squeegee rubber.
What is the abrasiveness of a squeegee?
The flat squeegee is ground and printed using the Squeegee Rubber edge. The sharpness of the edge of squeegee rubber during polishing is called the polishability of squeegee rubber.
What is the abrasion resistance of a squeegee?
After many prints, the edge of Squeegee Rubber wears down. This abrasion resistance is called abrasion resistance.
It is the diameter of the threads that make up the screen gauze.
What is gauze thickness?
It is the thickness of the threads that make up the screen, and the thickness of the gauze woven with the warp and weft threads. Therefore, it depends on the wire diameter of the gauze. This value is usually measured without tension. (where the warp and weft threads intersect)
What is emulsion thickness?
It refers to the thickness of the sealed part to prevent ink from coming out of the plate. (From the bottom of the gauze)
What is total thickness?
This value is the sum of gauze thickness and emulsion thickness.
What is the number of meshes in the mesh version?
The number of meshes between 1 inch (25.4mm). (indicates the weave density of the screen)
What is opening?
A number that represents the mesh size. Refers to the length of one side of the mesh.
What is the opening area?
The area ratio of the mesh to the required area is expressed in %.
What is transmission volume?
The amount of ink that passes through the gauze in actual printing. (note unit)
We recommend using cookies on this site for convenience and quality improvement. Please select Agree to use.If you do not agree, some functions cannot be used. View more
