1, the net frame
The most ideal net frame is made of metal, which is easy to handle, smooth, and not twisted.
2. The screen is made of woven nylon mesh, because of its stable tension. The mesh should be thick and fine, if it is too fine, and the difference between Zhang and Po is not tight; if it is too thick, the mesh is small, and the opening rate is not enough, it will affect the permeability of the slurry. Plain monofilament, uniform warp and weft yarns, uniform mesh size. Colored mesh is better than white, with a colored mesh stretch net to prevent chaos reflections.
3, stretch net
The conditional stretcher can be used to stretch the net and measured with a tensiometer to ensure that the four plates have the same tension.
Manual stretching can also be used to achieve the required requirements. This should adopt a pull-pulling and bonding method. By using a manual pull-grip chuck, it can pull out vertical and horizontal screens with uniform tension. Regardless of the method used, it must meet the requirements of the three-level stretch net. It cannot be stretched very tightly at one time, and the screen must be stretched to ensure its tension stability.
4, the requirements of the photosensitive adhesive to use high-quality water-resistant diazo photosensitive adhesive, gelatin, vinyl chloride, three yuan nylon and other photosensitive plastic fine drawing. The general color block overprint version uses domestic sensitized adhesive, exposure time is about 4-8 minutes, exposure time is between 15-20 seconds with ultraviolet light, with 40W10 fluorescent tubes, exposure time is only 50-70 seconds, light-sensitive The photosensitive adhesive with poor adhesiveness and weak adhesion cannot be cross-linked and cured at this time. It is not degumming, that is, it is not easy to develop or the outlets are not fully displayed.
For example 9500 photosensitive adhesive. It has the following features:
(1) The gel was milky white: light yellow after adding photosensitizer, lavender after exposure, high transparency, easy alignment or adjustment when screen printing.
(2) Delicate resin: Adhesion with the screen is very strong, generally coated, only need to be positive and negative once, it can be repeatedly applied without drying.
(3) High photosensitivity: The latitude of the exposure time is large. The lamp is soaked with potassium iodide and immersed in fresh water for 3-5 minutes. It is easy to develop, and the dots are smooth and clear. After the second exposure, the printing rate will increase.
5, exposure, development
The exposure table should be installed with the corresponding positioning card of the ink pad, set a good position, does not allow errors. During exposure, the positive film of the positive color separation card faces the sensitized surface of the stencil, and it is pressed tightly to ensure that the sensitized stencil and the negative film adhere to the exposure glass without any gap.
The exposure time depends on the sensitivity of the photoresist and the light source. Generally, the UV exposure is controlled between 15 and 20 seconds. With 40W10 fluorescent tube exposure, control in 50-60 seconds;
After soaking in clean water for 35 minutes, wipe with a sponge or spray with water. The water pressure should not be too high. When the humidity is low, it can be soaked in warm water at 20°C and then sprayed with clear water. Can not be washed with high-pressure water, after the second exposure to dry, so that the photosensitive crosslinked further curing, in order to improve the resistance to force.
Experience has shown that the yellow version of the screen angle is 90 °, easy to see the appearance of moire, but this does not affect the printing effect, because the yellow version is a light color, first printing, after the last three editions of superimposition, the moiré natural elimination. Magenta and cyan versions must not have any moire.
Production process:
First, in order to ensure plate-making, printing quality must be carefully selected network frame
1, full tension.
The material of the frame should have sufficient strength to resist the tension of the mesh, because when the mesh is stretched, the mesh will have a certain tension and pressure on the frame, which requires the mesh frame to have tensile strength, if the strength is not enough Will find music, it will be deformed, it can not print a good velvet products.
2, sturdy and durable.
In the use of the frame, it is often in contact with water, adhesives, and changes in temperature. This requires that the frame be free of skew, so as to ensure the repeated use of the frame, which can reduce waste and reduce costs.
3, the operation is light. Under the condition of ensuring the strength, the net frame should be selected as light as possible to facilitate operation and use.
4, good adhesion. The mesh frame and the screen bonding surface must have a certain degree of roughness to strengthen the adhesion of the screen and the frame.
5, the right size. The production of different specifications of the network box configuration, use the size of the printing according to the size of the appropriate frame to determine, you can reduce waste, but also easy to operate.
Second, on the stretch net
1, the process of stretching the net.
Firstly, according to the printing size, the stretch net is selected according to the printing frame size, and the bounding surface of the net frame and the wire mesh is cleaned. If the net frame is used for the first time, it needs to be lightly rubbed with fine sandpaper to make the surface of the frame rough. It is easy to improve the adhesion of the frame and the screen. If it is used, it must be rubbed with sandpaper to remove residual glue and other substances. After cleaning the frame, before the stretching, first apply the adhesive on the surface that is in contact with the screen and dry it.
When stretching the net, manually or mechanically stretch the net. After the screen is stretched, the screen and the net frame are tightly adhered, and then the adhesive is applied on the contact portion of the screen and the net frame, and then dried. Note that the adhesive should not be coated. The cloth is too thick or too thin. When it is dry, it can be wiped with a rubber sheet or a soft cloth, while applying a certain pressure, so that the screen and the frame can be bonded more firmly. After the adhesive is dry, loosen the external tension, cut the screen around the outside of the frame, and then use a single adhesive tape on the screen and the frame of the adhesive area, which can protect the screen With the role of the frame to ensure the effective use of screen printing plate. Finally, rinse the screen with clean water or detergent. After the screen is dry, it can be used for photosensitive coating (plate making). The process of stretching the net is as follows.
2, the basic requirements of stretch net.
(1) The tension of the entire mesh surface is even, and the mesh lines of all sides are evenly distributed within its elastic limit.
(2) The meshes are parallel to each other, and the meshes in the latitude and longitude are perpendicular to each other.
(3) Incremental stretching of nets over a period of time, to the point where the tension of the stretching net is not increased and no slackening occurs.
(4) The screen is stretched over the frame, and the forces acting on the frame and the mesh compensate each other for loss of tension.
3, the correct stretching method.
(1) In order to keep the warp and weft threads of the stretched mesh as perpendicular as possible to the edge of the mesh frame, it should be clamped straight when the screen is clamped into the clamp of the stretcher; gradually increase the force when starting up the stretcher. Stretching, leveling and tensioning the stretch net until it reaches the highest value. At this time, carefully check the position of the latitude and longitude parallel to the fixture along the edge of the fixture. If serious non-parallel is found, the mesh should be loosened and re-clamped. Mesh and slowly give power to the highest value. Stretch the net and avoid sudden force to the highest value, which will cause tension is not uniform, warp and weft skew, will form a plate version of the moire.
The most ideal net frame is made of metal, which is easy to handle, smooth, and not twisted.
2. The screen is made of woven nylon mesh, because of its stable tension. The mesh should be thick and fine, if it is too fine, and the difference between Zhang and Po is not tight; if it is too thick, the mesh is small, and the opening rate is not enough, it will affect the permeability of the slurry. Plain monofilament, uniform warp and weft yarns, uniform mesh size. Colored mesh is better than white, with a colored mesh stretch net to prevent chaos reflections.
3, stretch net
The conditional stretcher can be used to stretch the net and measured with a tensiometer to ensure that the four plates have the same tension.
Manual stretching can also be used to achieve the required requirements. This should adopt a pull-pulling and bonding method. By using a manual pull-grip chuck, it can pull out vertical and horizontal screens with uniform tension. Regardless of the method used, it must meet the requirements of the three-level stretch net. It cannot be stretched very tightly at one time, and the screen must be stretched to ensure its tension stability.
4, the requirements of the photosensitive adhesive to use high-quality water-resistant diazo photosensitive adhesive, gelatin, vinyl chloride, three yuan nylon and other photosensitive plastic fine drawing. The general color block overprint version uses domestic sensitized adhesive, exposure time is about 4-8 minutes, exposure time is between 15-20 seconds with ultraviolet light, with 40W10 fluorescent tubes, exposure time is only 50-70 seconds, light-sensitive The photosensitive adhesive with poor adhesiveness and weak adhesion cannot be cross-linked and cured at this time. It is not degumming, that is, it is not easy to develop or the outlets are not fully displayed.
For example 9500 photosensitive adhesive. It has the following features:
(1) The gel was milky white: light yellow after adding photosensitizer, lavender after exposure, high transparency, easy alignment or adjustment when screen printing.
(2) Delicate resin: Adhesion with the screen is very strong, generally coated, only need to be positive and negative once, it can be repeatedly applied without drying.
(3) High photosensitivity: The latitude of the exposure time is large. The lamp is soaked with potassium iodide and immersed in fresh water for 3-5 minutes. It is easy to develop, and the dots are smooth and clear. After the second exposure, the printing rate will increase.
5, exposure, development
The exposure table should be installed with the corresponding positioning card of the ink pad, set a good position, does not allow errors. During exposure, the positive film of the positive color separation card faces the sensitized surface of the stencil, and it is pressed tightly to ensure that the sensitized stencil and the negative film adhere to the exposure glass without any gap.
The exposure time depends on the sensitivity of the photoresist and the light source. Generally, the UV exposure is controlled between 15 and 20 seconds. With 40W10 fluorescent tube exposure, control in 50-60 seconds;
After soaking in clean water for 35 minutes, wipe with a sponge or spray with water. The water pressure should not be too high. When the humidity is low, it can be soaked in warm water at 20°C and then sprayed with clear water. Can not be washed with high-pressure water, after the second exposure to dry, so that the photosensitive crosslinked further curing, in order to improve the resistance to force.
Experience has shown that the yellow version of the screen angle is 90 °, easy to see the appearance of moire, but this does not affect the printing effect, because the yellow version is a light color, first printing, after the last three editions of superimposition, the moiré natural elimination. Magenta and cyan versions must not have any moire.
Production process:
First, in order to ensure plate-making, printing quality must be carefully selected network frame
1, full tension.
The material of the frame should have sufficient strength to resist the tension of the mesh, because when the mesh is stretched, the mesh will have a certain tension and pressure on the frame, which requires the mesh frame to have tensile strength, if the strength is not enough Will find music, it will be deformed, it can not print a good velvet products.
2, sturdy and durable.
In the use of the frame, it is often in contact with water, adhesives, and changes in temperature. This requires that the frame be free of skew, so as to ensure the repeated use of the frame, which can reduce waste and reduce costs.
3, the operation is light. Under the condition of ensuring the strength, the net frame should be selected as light as possible to facilitate operation and use.
4, good adhesion. The mesh frame and the screen bonding surface must have a certain degree of roughness to strengthen the adhesion of the screen and the frame.
5, the right size. The production of different specifications of the network box configuration, use the size of the printing according to the size of the appropriate frame to determine, you can reduce waste, but also easy to operate.
Second, on the stretch net
1, the process of stretching the net.
Firstly, according to the printing size, the stretch net is selected according to the printing frame size, and the bounding surface of the net frame and the wire mesh is cleaned. If the net frame is used for the first time, it needs to be lightly rubbed with fine sandpaper to make the surface of the frame rough. It is easy to improve the adhesion of the frame and the screen. If it is used, it must be rubbed with sandpaper to remove residual glue and other substances. After cleaning the frame, before the stretching, first apply the adhesive on the surface that is in contact with the screen and dry it.
When stretching the net, manually or mechanically stretch the net. After the screen is stretched, the screen and the net frame are tightly adhered, and then the adhesive is applied on the contact portion of the screen and the net frame, and then dried. Note that the adhesive should not be coated. The cloth is too thick or too thin. When it is dry, it can be wiped with a rubber sheet or a soft cloth, while applying a certain pressure, so that the screen and the frame can be bonded more firmly. After the adhesive is dry, loosen the external tension, cut the screen around the outside of the frame, and then use a single adhesive tape on the screen and the frame of the adhesive area, which can protect the screen With the role of the frame to ensure the effective use of screen printing plate. Finally, rinse the screen with clean water or detergent. After the screen is dry, it can be used for photosensitive coating (plate making). The process of stretching the net is as follows.
2, the basic requirements of stretch net.
(1) The tension of the entire mesh surface is even, and the mesh lines of all sides are evenly distributed within its elastic limit.
(2) The meshes are parallel to each other, and the meshes in the latitude and longitude are perpendicular to each other.
(3) Incremental stretching of nets over a period of time, to the point where the tension of the stretching net is not increased and no slackening occurs.
(4) The screen is stretched over the frame, and the forces acting on the frame and the mesh compensate each other for loss of tension.
3, the correct stretching method.
(1) In order to keep the warp and weft threads of the stretched mesh as perpendicular as possible to the edge of the mesh frame, it should be clamped straight when the screen is clamped into the clamp of the stretcher; gradually increase the force when starting up the stretcher. Stretching, leveling and tensioning the stretch net until it reaches the highest value. At this time, carefully check the position of the latitude and longitude parallel to the fixture along the edge of the fixture. If serious non-parallel is found, the mesh should be loosened and re-clamped. Mesh and slowly give power to the highest value. Stretch the net and avoid sudden force to the highest value, which will cause tension is not uniform, warp and weft skew, will form a plate version of the moire.
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