Screen printing frame type,material and Screen printing frame production steps

Screen printing frame types generally have the following types

1, aluminum screen printing frame

Is not rusty material, lightweight operation is less effortless, aluminum frame seams should be close sealed, so as not to infiltrate into the chemical aluminum frame, the general wall thickness of 1.5 to 3 mm, height 20 to 40 mm, width 25 ~ 60 mm of aluminum is more capable than the ordinary printing work, there are reinforced type, that is, in the empty bar together with a horizontal piece for support. Aluminum frame for the standard aluminum alloy material hardness of 18 ° is better, the material density of 0.9 g / cm3.

2, wood screen printing frame

For printing that does not require precision, it is easier to work with wooden frames, but the timber is easily affected by the temperature of the moisture. The wooden frame has a much shorter life span than the metal frame, so it can be watered with two- , Solvent resistance, accurate sets of printing is not suitable for the use of wooden frame, the steel density of 7.8 grams / cubic centimeter.

3, steel screen printing frame

In order to rust, steel frame are galvanized, or coating with two liquid paint, paint treatment is also useful, the steel frame has excellent compatibility and flatness is not easy to deform, the material density of 2.7 grams / cubic cm.

4, barbed wire mesh printing

For special box, often made of iron, because of its good stability, but easy to rust and heavy, is not often used as a major factor.

5, since the screen printing network frame

That is to say, the utility model has a screw clip with a tension net which can adjust the net tension without using the net netting machine, and can adjust the tension when the old net is stretched elastically and slackly, but the image stretching is difficult to adjust when printing, Can easily lead to uneven tension, or the phenomenon of broken web, Zhang should not pull too tight from the middle will cause both sides can not stretch, and the other is to strengthen the fixed pressure can be pasted double-sided tape.

6, cast screen printing frame

The general IC thick film printing or CD-ROM printing is often a fixed frame, that is, the frame is made of aluminum or stainless steel directly into one, the frame presets have a plate positioning holes, so the plate should be taken when positioning sensitized.

Screen printing frame before use

1, the sharp edges and corners must be rounded, otherwise the tensioning mesh will be cut open.

2, the mesh of the adhesive surface dirty or scratched, it should be refurbished, so adhesive will enhance the follow-up, the old version of the frame, the adhesive residue should be cleaned.

3, the metal frame in the cohesion on the roughening, you must use the fat policy to the end of the fat, and cellulose solvents and acetone is the longest use for this purpose, but can not use denatured alcohol and greasy petroleum products. Some net aluminum frame itself has a thin groove is used to enhance the fixation.

4, the general tension required for mesh is as follows:

(Single) polyester mesh 8 ~ 10㎏ / c ㎡, tulle 7 ~ 9㎏ / c ㎡, stainless steel mesh 10 ~ 13㎏ / c㎡,

(Complex) polyester mesh 7 ~ 9㎏ / c ㎡, nylon mesh 8 ~ 10㎏ / c ㎡

Fifth, choose the ideal adhesive to have the following characteristics:

1 can quickly harden.

2. Unaffected by changes in temperature.

3. Water, resistant to screen printing ink solvents and cleaning agents.

4. Non-toxic, non-acidic, does not damage the mesh.

5. At present, followed by the use of South Po 105,104 instant adhesive, Su Min hard UV then.

Six, oblique network

The purpose is to adopt a fixed angle mesh screen to cope with the film negative angle print version, such as the line draft and mesh into 22.5 degrees, text draft of 45 degrees, depending on the network to avoid the wrong network angle, etc., On the printing plate, another purpose is to skew the web to better ink permeability, which is related to the direction of the doctor blade.

Seven, mechanical stretching machine

For the higher precision screen work, the plates are used to Zhang Zhang Zhang network to control the tension of the mesh quality, the current use of Zhang network has pneumatic and mechanical, and mesh paste mostly mining Strong adhesive (such as South Po 104,105 two-liquid or instant nostril).

1. Pressure Tensioner Features: Air-type tensioner is activated by pressure Zhang mesh folder to pull a mesh cloth, jig is stretched when the top against the box and pull to the four sides. Pressure netting machine Each net folder by the pressure valve, often caused by the shortcomings of uneven tension, Zhang Hao box after cutting, the box just to pull the pressure and tension offset.

2. Mechanical Stretching Machine: Pulling is the wrench of the wrench to control the tension of the mesh. Therefore, the pulling force of each jig is the same, the deformation of the frame is less likely to occur, and when the mesh is stretched, Tension meter at any time to measure the latitude and longitude tension, but not on the tension meter placed on the mesh, so as not to pull the mesh cloth rupture caused by tension meter damage, Zhang mesh stretching machine gear and spiral is to fix the tension than the latter good.

3. The use of air stretching machine: air motor to pay attention to its operation, and may have a limited time plus Canada R16 oil, and often make the case to exclude air filter tank water filter.

screen printing screen production steps:

1. Net folder inspection: Zhang network operations, should check the folder fixture rubber dirt or glue off, the metal part of the scars in order to avoid scratches net cloth, and to be cleaned and adjusted.

2. Mesh check: bright work desk, view the mesh size, type and whether there are flaws.

3. Check the board frame: Check the surface of the board frame is clean, angle without fault or too sharp, and the specifications are correct.

4 folder meshing gap is correct: fixture distribution is close, pneumatic clamping tension is uniform.

5. When the network tension should be slowly increased, usually Zhang a good board, stretching takes some time, the way for the first time the first stretch of the mesh tension to about 75% of the required tension to eliminate mesh Curl and smooth the mesh.

The second time the mesh stretched to about 90% to tighten the knot.

The third stretch to the maximum tension required mesh, in order to stabilize the tension mesh.

6. Zhang good mesh cloth should be placed more than ten minutes, so that the stability of mesh properties, and then engaged in the paste box operations.

7. Plate frame and mesh fixed: To South Bao resin, Su Min hit the hard or instantaneous agent, after appropriate adjustments to brush or bottle filling evenly brushing or injection to the aluminum frame mesh, and then immediately set A sharp beak-like can be directly inverted, and then with a smaller than the aluminum frame rubber scraping glue will be the frame of the strong plastic scraping average, and half-dry when the appropriate pressure paste.

8 completely paste the box stencil, removed from the net machine should be placed about a day so that the shrinkage of the mesh and the net box plate.

screen printing screen Operational review:

1. Netting machine chuck, there are activities (long) and fixed (long) two, long head chuck type is more ideal, because it can unite in all directions to pull the mesh uniform, Fixed chuck, usually make the four corners of the tension is too large, causing the mesh distortion or even rupture.

2. Fixture itself has a square and oblique form, and both sides of the collet is straight or oblique, fixture such as square form, the gap between the two fixtures more easily, while the oblique form of chuck, junction at the same time clamps note transfer network.

3. Zhang net machine in the folder mesh, the mesh folder wrinkles can not be crooked outside, the warp and weft yarn should be parallel to the vertical and horizontal frame, with the exception of Zhang with an exception.

4. Mesh Zhang good fit, in order to avoid the mesh cloth and the frame is close to the mesh cloth can be pressed to increase the degree of its follow-up.

5. When the mesh is good, the tension will be slightly reduced by 2 to 3 Newtons (about 10 to 20%) when it is stretched.