Silkscreen printing expertise
Introduction
Screen printing is a printing technology that has emerged in modern times . It uses a tensioned wire mesh to paste a screen on an aluminum or wooden frame , and uniformly applies a photosensitive paste on the screen , below 50 °C . low temperature drying, the drying machine network using a prepared pattern film sheet drying wire mesh to prepare a screen for screen printing. Screen printing methods include manual printing and machine printing.
Manual printing and machine printing
Manual printing :
Simple manual printing, fabrics and less precision product can be hand-printed, less efficient, but less cost.
Machine printing :
To achieve high efficiency and high quality , we must use a better screen printing machine. Specialized screen printer is printing apparatus, it points to print, and a flat surface printing \ dual-surface printing apparatus. I will try to say a little about the plane printing :
Details of printing planes by machine :
Install the screen with the dried pattern on the net arm of the machine , adjust the balance of the screen to the table , adjust the distance of the screen to the table , and install the applicator at the position where the applicator and the oil return knife are installed respectively. And the oil return knife , adjust the balance and angle of the rubber knife and the oil return knife to the screen. Manually raise the screen , place the substrate on the workbench , use the long suction device to suck the substrate on the workbench , lower the screen , and repeatedly adjust the screen or the substrate to make the pattern in the proper position of the substrate . Fix the screen position. After printing the raised member determines the position of the table screen, with slightly thinner than the film printing member for printing three-point member positioned on the table, with the table other than the tape substrate member to cover suction holes, Prevent air leakage and enhance the adsorption force of the workbench to the printing plate. Put the ink on the screen , use the manual or semi-automatic test , turn the suction selector switch to the suction position , adjust the blade pressure and angle , and observe the printing effect.
General notes :
The pressure of the squeegee is too large to thicken the substrate ink and damage the image. Increasing the angle between the squeegee and the oil return knives , increasing the pressure of the oil return knives on the screen , increasing the oil return speed , and increasing the mesh size will reduce the ink on the surface of the substrate. The distance from the shading to the workbench is about 1.5MM-5MM; for products with higher printing accuracy , the mesh distance should not be greater than 3MM . In addition to the above , for the quality of the printing and the number of meshes , different substrates should be selected with different properties of ink , ink viscosity , printing speed , working environment and operator proficiency, etc. , depending on Take appropriate measures in the actual situation.
Pad printing , also known as tampo printing , is an indirect concave plastic head printing technology that has become a major method for surface printing and decoration of various objects.
principle
The process is very simple: the first design pattern etched on the printing plate, etched plates coated with ink, and then, by silica gel wherein the head portion of the ink transferred onto the object to be printed.
Apply ink to the etched board
There are many ways to apply ink to an etched plate. First , open the ink applicator , spray the ink onto the etched plate , and then scrape off the excess ink with a retractable scraper. At this time , the solvent remaining in the ink of the etched area volatilizes and forms a gel-like surface , and then the adhesive head is lowered onto the etched plate to absorb the ink.
Ink absorption and transfer printing
The glue head is sucked up by half of the ink on the etched plate and then rises . At this time , the ink is partially evaporated , and a part of the undried ink surface is more favorable for the tight bonding of the printed object and the plastic head. Zaoxing plastic head to produce a rolling action to discharge excess air to make the ink etched plate surface.
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Film formation process
Ideally, all of the ink is etched boards are all transferred onto the object to be printed, the film-forming process (approximately 5 microns or 0.005 mm thick adhesion of ink is transferred to the substrate) printed susceptible to air dispensing head , temperature, static electricity and other effects. If a transfer to a plastic plate is etched from the head, the whole process of the substrate, the evaporation rate and the rate of dissolution in an equilibrium state precisely controlled, it is considered a successful plastic head printing. If the evaporation is too fast , the ink will dry out before it is absorbed. If the evaporation is too slow , the surface of the ink has not yet formed a gel , which is difficult to adhere to the substrate and the substrate. This model works basically on any model used today.
Etched board
Three main etched substrates :
1. The steel plate
2. Thin steel plate
3. Plastic photopolymer plate ( photosensitive )
In the case of any image , they are all produced by photography. First, the object to be photographed emulsion to produce positive, then positive on the plate surface. The plate has been coated with a photosensitive layer , and when exposed to ultraviolet light , no image area is hardened. Then , wash away the photosensitive material in the image area (the plastic photopolymerization plate is washed with a mixture of water and alcohol ) and finally dry. This high-quality etched sheet fabrication equipment is inexpensive and costs about S $ 3,000 to be manufactured on request . For the metal plate , once the photosensitive material in the image area is washed away , the metal plate is placed in an etching material such as iron chlorate or hydrochloric acid , etched , and requires careful operation. The use of thick or thin steel sheets , or plastic photopolymer plates, depends on the printer. Thick steel plates are most suitable for production , but the printing quality is poor . Thin steel plates are different from thick steel plates . Usually, a layer of emulsion is pre-coated , which is more practical . However , the quality of plastic photopolymer plates is the best among the three , but Production is the worst. The depth and quality of the etch are very important. The depth is not appropriate and the image effect is poor. If you use a defective poor quality steel plate, then printed it will be reflected.
Silicone transfer head
The transfer head is made of flexible silicone and can be made into many different shapes. Its role is to obtain a pattern is etched from the board, and the pattern is transferred to the substrate. The ability of the transfer head to absorb ink and its print quality are affected by four factors :
1. The shape of the transfer head
2. The hardness of the transfer head
3. Surface condition of the transfer head
4. Transfer head manufacturing materials
The basic shape of the transfer head tends to be circular, rectangular or square, such shape suitable for contact with the transfer head prior etched plate surface, and when contacted with a print, pattern roll. The size and shape of the pattern and the strength of the roll determine which transfer head to use. The selection principle is : the harder the transfer head , the better the ink transfer effect. Depending on the amount added to rubber hardness in the silicone oil, with the use of an ink solvent added only little silicone oil. The ideal transfer head surface is very smooth and dull ; carefully rubbing the transfer head with a solvent-impregnated tissue can produce good results. After printing about 50,000 times, if the transfer head exhibits abrasion trace image, it should replace the transfer head, the same time must be careful not to damage the surface of the transfer head.
Ink
Silicone transfer head printing sheets require inks with high pigment content , fast drying of the resin , and rapid solvent evaporation. Since there are many materials that can be printed using this process , various inks are available. Silicone transfer head printing inks are expensive due to their small amount. The ink for screen printing is generally not suitable for transfer head printing because it does not dry fast enough and has a pigment content of only 5% .
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Sealed oil cup type pad printing machine
Another option for an open ink tank is to seal the ink tank model. In one flip Sheng ink container, and the etching by contacting the pressure plate. The scraper of the container removes ink from the etched plate. Since the container is sealed , the solvent cannot be volatilized , the conditions of the ink remain stable , and the machine has a longer service life. Although this type of machine seems to solve the problem of ink stability , how to properly mix ink is still an important issue , and many factors will still affect the evaporation of the solvent. Press operator must be very serious and responsible, otherwise it will wear etching plates, and the container will be put in place other than ink-jet etching plates. And changing an ink tank is expensive. Such systems are increasingly being used in automated production lines.
The main points of plastic head printing
From negative film to electroplated etched plate
The positive-working negative film to be reproduced is exposed in front of a blank plate having a photopolymerizable plating layer to form an electroplated etched plate.
From plastic head to electroplated etched board
At this time , the silicone transfer head is pressed against the plating etched plate , and the ink forms a pattern to be printed and then lifted.
From plastic head to finished product
The glue head is then pressed against the substrate to be fixed , at which point the ink is discharged.
Remove the finished product from the plastic head
To be printed is lifted from the plastic head, the ink scraped off by a doctor blade plating etching plate, so that the dispensing head able to print only the next site from the suction required from the ink.
Introduction
Screen printing is a printing technology that has emerged in modern times . It uses a tensioned wire mesh to paste a screen on an aluminum or wooden frame , and uniformly applies a photosensitive paste on the screen , below 50 °C . low temperature drying, the drying machine network using a prepared pattern film sheet drying wire mesh to prepare a screen for screen printing. Screen printing methods include manual printing and machine printing.
Manual printing and machine printing
Manual printing :
Simple manual printing, fabrics and less precision product can be hand-printed, less efficient, but less cost.
Machine printing :
To achieve high efficiency and high quality , we must use a better screen printing machine. Specialized screen printer is printing apparatus, it points to print, and a flat surface printing \ dual-surface printing apparatus. I will try to say a little about the plane printing :
Details of printing planes by machine :
Install the screen with the dried pattern on the net arm of the machine , adjust the balance of the screen to the table , adjust the distance of the screen to the table , and install the applicator at the position where the applicator and the oil return knife are installed respectively. And the oil return knife , adjust the balance and angle of the rubber knife and the oil return knife to the screen. Manually raise the screen , place the substrate on the workbench , use the long suction device to suck the substrate on the workbench , lower the screen , and repeatedly adjust the screen or the substrate to make the pattern in the proper position of the substrate . Fix the screen position. After printing the raised member determines the position of the table screen, with slightly thinner than the film printing member for printing three-point member positioned on the table, with the table other than the tape substrate member to cover suction holes, Prevent air leakage and enhance the adsorption force of the workbench to the printing plate. Put the ink on the screen , use the manual or semi-automatic test , turn the suction selector switch to the suction position , adjust the blade pressure and angle , and observe the printing effect.
General notes :
The pressure of the squeegee is too large to thicken the substrate ink and damage the image. Increasing the angle between the squeegee and the oil return knives , increasing the pressure of the oil return knives on the screen , increasing the oil return speed , and increasing the mesh size will reduce the ink on the surface of the substrate. The distance from the shading to the workbench is about 1.5MM-5MM; for products with higher printing accuracy , the mesh distance should not be greater than 3MM . In addition to the above , for the quality of the printing and the number of meshes , different substrates should be selected with different properties of ink , ink viscosity , printing speed , working environment and operator proficiency, etc. , depending on Take appropriate measures in the actual situation.
Pad printing , also known as tampo printing , is an indirect concave plastic head printing technology that has become a major method for surface printing and decoration of various objects.
 |
principle
The process is very simple: the first design pattern etched on the printing plate, etched plates coated with ink, and then, by silica gel wherein the head portion of the ink transferred onto the object to be printed.
Apply ink to the etched board
There are many ways to apply ink to an etched plate. First , open the ink applicator , spray the ink onto the etched plate , and then scrape off the excess ink with a retractable scraper. At this time , the solvent remaining in the ink of the etched area volatilizes and forms a gel-like surface , and then the adhesive head is lowered onto the etched plate to absorb the ink.
Ink absorption and transfer printing
The glue head is sucked up by half of the ink on the etched plate and then rises . At this time , the ink is partially evaporated , and a part of the undried ink surface is more favorable for the tight bonding of the printed object and the plastic head. Zaoxing plastic head to produce a rolling action to discharge excess air to make the ink etched plate surface.
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Film formation process
Ideally, all of the ink is etched boards are all transferred onto the object to be printed, the film-forming process (approximately 5 microns or 0.005 mm thick adhesion of ink is transferred to the substrate) printed susceptible to air dispensing head , temperature, static electricity and other effects. If a transfer to a plastic plate is etched from the head, the whole process of the substrate, the evaporation rate and the rate of dissolution in an equilibrium state precisely controlled, it is considered a successful plastic head printing. If the evaporation is too fast , the ink will dry out before it is absorbed. If the evaporation is too slow , the surface of the ink has not yet formed a gel , which is difficult to adhere to the substrate and the substrate. This model works basically on any model used today.
Etched board
Three main etched substrates :
1. The steel plate
2. Thin steel plate
3. Plastic photopolymer plate ( photosensitive )
In the case of any image , they are all produced by photography. First, the object to be photographed emulsion to produce positive, then positive on the plate surface. The plate has been coated with a photosensitive layer , and when exposed to ultraviolet light , no image area is hardened. Then , wash away the photosensitive material in the image area (the plastic photopolymerization plate is washed with a mixture of water and alcohol ) and finally dry. This high-quality etched sheet fabrication equipment is inexpensive and costs about S $ 3,000 to be manufactured on request . For the metal plate , once the photosensitive material in the image area is washed away , the metal plate is placed in an etching material such as iron chlorate or hydrochloric acid , etched , and requires careful operation. The use of thick or thin steel sheets , or plastic photopolymer plates, depends on the printer. Thick steel plates are most suitable for production , but the printing quality is poor . Thin steel plates are different from thick steel plates . Usually, a layer of emulsion is pre-coated , which is more practical . However , the quality of plastic photopolymer plates is the best among the three , but Production is the worst. The depth and quality of the etch are very important. The depth is not appropriate and the image effect is poor. If you use a defective poor quality steel plate, then printed it will be reflected.
Silicone transfer head
The transfer head is made of flexible silicone and can be made into many different shapes. Its role is to obtain a pattern is etched from the board, and the pattern is transferred to the substrate. The ability of the transfer head to absorb ink and its print quality are affected by four factors :
1. The shape of the transfer head
2. The hardness of the transfer head
3. Surface condition of the transfer head
4. Transfer head manufacturing materials
The basic shape of the transfer head tends to be circular, rectangular or square, such shape suitable for contact with the transfer head prior etched plate surface, and when contacted with a print, pattern roll. The size and shape of the pattern and the strength of the roll determine which transfer head to use. The selection principle is : the harder the transfer head , the better the ink transfer effect. Depending on the amount added to rubber hardness in the silicone oil, with the use of an ink solvent added only little silicone oil. The ideal transfer head surface is very smooth and dull ; carefully rubbing the transfer head with a solvent-impregnated tissue can produce good results. After printing about 50,000 times, if the transfer head exhibits abrasion trace image, it should replace the transfer head, the same time must be careful not to damage the surface of the transfer head.
 |
Ink
Silicone transfer head printing sheets require inks with high pigment content , fast drying of the resin , and rapid solvent evaporation. Since there are many materials that can be printed using this process , various inks are available. Silicone transfer head printing inks are expensive due to their small amount. The ink for screen printing is generally not suitable for transfer head printing because it does not dry fast enough and has a pigment content of only 5% .
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Sealed oil cup type pad printing machine
Another option for an open ink tank is to seal the ink tank model. In one flip Sheng ink container, and the etching by contacting the pressure plate. The scraper of the container removes ink from the etched plate. Since the container is sealed , the solvent cannot be volatilized , the conditions of the ink remain stable , and the machine has a longer service life. Although this type of machine seems to solve the problem of ink stability , how to properly mix ink is still an important issue , and many factors will still affect the evaporation of the solvent. Press operator must be very serious and responsible, otherwise it will wear etching plates, and the container will be put in place other than ink-jet etching plates. And changing an ink tank is expensive. Such systems are increasingly being used in automated production lines.
The main points of plastic head printing
From negative film to electroplated etched plate
The positive-working negative film to be reproduced is exposed in front of a blank plate having a photopolymerizable plating layer to form an electroplated etched plate.
From plastic head to electroplated etched board
At this time , the silicone transfer head is pressed against the plating etched plate , and the ink forms a pattern to be printed and then lifted.
From plastic head to finished product
The glue head is then pressed against the substrate to be fixed , at which point the ink is discharged.
Remove the finished product from the plastic head
To be printed is lifted from the plastic head, the ink scraped off by a doctor blade plating etching plate, so that the dispensing head able to print only the next site from the suction required from the ink.
our company is professional manufacturer of rubber products.Besides producing some general rubber products, we can also customize the production according to your requirements.
RenqiuXingcheng Rubber Products Co., Ltd. is located in the side of the Baiyang lake, our company is professional manufacturer of rubber products. We are one of the leading rubber company in china,The company is a private enterprise which is engaged in scientific research, production, sales and service and has obtained ISO 9001 certification. Our main business is producing all kinds of rubber products, including anti-skid plates, Rubber Sheet Series, Rubber Mat Series and horse mat series ect., The products are shockproof, anti-wear, anti-high and low temperature, anti-aging, oil resistant and chemical resistant in character.At present, our products have been sold at home and abroad and mainly exported to Canada, Germany, Chile, etc. We welcome domestic and foreign merchants to negotiate and cooperate with us. We are willing to join hands with old and new friends in creating a better tomorrow.
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Renqiu Xingcheng Rubber Products Co., Ltd. , http://www.xingchengrubber.com