With the gradual establishment of a market economy in China, all industries and industries have begun to enter a stage of stable development. The eyewear industry is an industry that is closely related to people's daily lives and is naturally no exception.
There are thousands of enterprises engaged in the production of glasses in China, with several billion yuan in consumption each year. Although this is a cake that is not too big, but as a daily consumer goods, its market is still very large. The content of this article does not involve the development of the spectacles industry, but rather the printing that merchants compete for for consumers to identify the product. It should be said that the continuous increase in brand awareness has led producers to pay attention to the etch marks on the surface of products becoming fashionable. Consumers are paying more attention to identifying their favorite brands and styles through eye-catching text or graphic information.
Glasses consist of lenses and frames. The edge area of ​​the lens near the blind spot of the eye usually needs to be printed, and the center of the nose pad of the frame and the side of the temple are both printable parts. In order to be lightweight, the frames are usually forged from light-weight, tough steel and the frames are very narrow, usually between 1 and 2 mm. In such a small space, the number of printed products is usually printed to distinguish a wide variety of glasses styles. The vast majority of lenses are made of highly transparent glass, and some of the lenses are made of resin sheets with the trademark of the printing manufacturer as a decorative measure.
The reason why the printing of the lens is used for pad printing is that pad printing can be performed on a smooth and arcuate surface, and laser marking causes damage to the surface of the lens. In addition to pad printing, frames can be printed using laser marking. Both pad printing and laser marking can be realized in a very small area, but they are obviously different: Laser marking actually has an etching effect and can be saved forever: the printing artwork is easy to peel off, but it can be selected at will. Color to increase the eye-catching effect. Considered from the perspective of cost, the price of laser marking machines is between 10 to 200,000 yuan, and the investment is large. The price of printing machines is only about 15,000 yuan, and the investment is much smaller.
The use of etching methods to obtain images is also a common practice to replace laser marking. The eyeglass industry usually uses ferric chloride solution to make etching texts. However, one of the potential threats to the etching technique is the destruction of the environment. Today, the use of the technology in the society is becoming more and more important.
Control of printing elements
The most significant feature of pad printing is indirect printing. The biggest advantage of indirect printing is that it maintains the independence of the position of the printing plate and the substrate. The change in the shape of the pad of the printing pad that transfers the ink on the printing plate to the surface of the substrate causes the shift. India's adaptability to the shape of the substrate has greatly increased.
Now we will give a brief introduction of the printing process technology involved in the printing of glasses, so that we can understand the application of pad printing technology in the optical industry.
1, ink selection
Ink selection plays a very important role in pad printing technology, which is widely related to the printing materials involved in pad printing technology. Because the frames are made of metal, the adhesion of the ink to the metal surface is required to be better. Nowadays, two-component inks are generally used, and the drying mode is dry. Lens printing requires glass inks, glass inks are usually two-component inks, and the drying method is dry. The two-component ink cured ink layer has high hardness and good adhesion, but the operation is slightly more troublesome.
The usage of two-component inks is briefly described as follows:
(1) First, according to the ink instructions, the hardener is added to the ink and stirred uniformly, and is poured into an oil pan for printing. Since the two-component ink slowly cures, control the dosage.
(2) The printing should be placed in a drying oven to speed up the drying process. Two-component inks generally have a drying time of up to 10 hours at room temperature, which can affect the production efficiency. The drying method is ideal. Usually, the drying temperature is between 150° C. and 180° C. and the time is 5 to 10 minutes. .
2. Printing plastic head
The choice of pad printing head in the pad printing process is crucial. First of all, the shape of the print head should be able to print to the specified position, and secondly, the deformation should be smaller. Because the printing area of ​​the frame is very small, the printing head should be slightly sharper. Through testing, the A7 plastic head with a cross-sectional area of ​​38 mm is suitable. The printing effect of the A3 rubber head is also very good, but due to the slightly smaller cross section, the printing distortion is slightly larger.
The hardness of the printing head is another indicator that should be taken into consideration when selecting the printing head. The flexibility of the rubber head is wider, but the printing text is greatly deformed. Especially for products that are as small as eyeglass frames, the graphic font is very small. The graphic distortion is very easy to make the graphic lines stick together and become blurred. Therefore, it is better to choose a stiffer plastic head. Our test The result is a plastic head with a Shore hardness of 32 degrees to achieve the best print quality.
The selection of the plastic head for the printing of the nose pads shall take into account the limitations of the position. A plastic head with a smaller cross-sectional area shall be selected. Our test result is that the plastic head with a cross-sectional area under 15 mm is more suitable and the hardness should be above 32 degrees.
3. Steel plate
The printing plate of the pad printing machine is a steel plate. The method of producing the steel plate is an etching method. The printing frames of the frame and the lens are very small, so the size of the steel plate does not need to be too large. In accordance with the printing industry standards, the use of 75mm × l00mm and 100mm × 100mm two kinds of steel plates can be, but the longest side of the image frames printed frame length is only 20mm, so the text can use 75mm × 100mm steel plate.
The steel plate is manufactured using a conventional etching method. Due to the small size of the font and the short exposure time, a uniform steel plate can be obtained.
In the production of steel plates, depth control is a major indicator. Too deep depths can easily cause stencils, and the transfer of ink is affected, and the strokes of the fonts are likely to be uneven in thickness, the pitch between the strokes becomes smaller, and the sharpness decreases. The disadvantage of being too shallow is also obvious. This is because the color saturation of the font is not high and the color is difficult to achieve eye-catching effects. Our test results are ideal for depth control at 19 μm.
4. Printing machine
The frame of the spectacle frame has a small printing area and is only a trademark of a printing company. Therefore, it does not involve complicated graphics or color registration, and a small-area pad printer with a single color should be selected as the machine.
5. Fixture
In the special printing industry, making jigs is a basic job. In general, the production jig is mainly to ensure that the printing area of ​​the substrate and the plastic head have relatively fixed positions, so as to ensure the unity of the printing of the product. At the same time, it is easy to realize overprinting when multi-color overprinting is involved, so the position of the fixture in the pad printing process is indispensable. The inner edge of the spectacle frame is the area for printing images, and this position must be clamped by the clamp to ensure parallel with the print head. During the printing process, the spectacle frame cannot be loosened, and the fastening effect is required. The use of crystal glue cast fixtures should be preferred.
The method of casting the crystal glue is based on the principle that the unsaturated polyester resin solidifies under the action of the hardener, and it is very easy to cure according to the shape of the product. No matter how complicated the structure of the spectacle frame is, the jig produced by this method can fix the spectacle frame well and meet the printing requirements. The production method is: First, the resin A component and the B component are mixed and mixed uniformly into a previously prepared paper type until the resin is in a gelled state, and the spectacle frame can be removed.
Although the printing of frames and lenses is a very simple process, it can be seen from this that the characteristics of the printing process are:
Pad printing is very suitable for products with small printing area and irregular printing position; it is the specific parts of the optical products that need to be printed that make the printing process wonderfully applicable.
From the point of view of the printing process, in order to achieve an exquisite printing effect, the selection of a high-quality printing ink and a relatively high hardness printing head are two factors that must be considered.
The printing effect is inextricably linked with the fixture quality.
Conclusion
The application of the pad printing process in the eyewear industry illustrates at least two problems: First, any company wants to gain more market share in the ever-changing market, in addition to constantly improving the level of technology in the manufacturing process, the characteristics of its products The use of various decorative methods to show that it is becoming a matter of increasing concern to corporate managers. For the vast majority of consumers, eye-catching product information and instructions are more likely to inspire their desire to buy.
Another problem is: Since the mankind began to manufacture the first product, although gradually understand the work, but the division of labor can never be separated from the internal links between the industry, especially with the printing. When people are at a loss in the fierce market competition, they may wish to look into another industry and may find new inspiration. Pad printing is an industry that is easy to inspire. With a little brains, a creative solution will soon be created. With these sophisticated solutions, no one will fear any competitors.
The market economy is cruel and fair, and those creative ideas are constant. Companies that are good at eating crabs often take the lead. We respected the first company that applied the printing process to the optical industry. They have already taken the lead. We would also like to promote companies that will expand the printing process to new areas in the future. Similarly, they will also walk in the industry. cutting edge.
There are thousands of enterprises engaged in the production of glasses in China, with several billion yuan in consumption each year. Although this is a cake that is not too big, but as a daily consumer goods, its market is still very large. The content of this article does not involve the development of the spectacles industry, but rather the printing that merchants compete for for consumers to identify the product. It should be said that the continuous increase in brand awareness has led producers to pay attention to the etch marks on the surface of products becoming fashionable. Consumers are paying more attention to identifying their favorite brands and styles through eye-catching text or graphic information.
Glasses consist of lenses and frames. The edge area of ​​the lens near the blind spot of the eye usually needs to be printed, and the center of the nose pad of the frame and the side of the temple are both printable parts. In order to be lightweight, the frames are usually forged from light-weight, tough steel and the frames are very narrow, usually between 1 and 2 mm. In such a small space, the number of printed products is usually printed to distinguish a wide variety of glasses styles. The vast majority of lenses are made of highly transparent glass, and some of the lenses are made of resin sheets with the trademark of the printing manufacturer as a decorative measure.
The reason why the printing of the lens is used for pad printing is that pad printing can be performed on a smooth and arcuate surface, and laser marking causes damage to the surface of the lens. In addition to pad printing, frames can be printed using laser marking. Both pad printing and laser marking can be realized in a very small area, but they are obviously different: Laser marking actually has an etching effect and can be saved forever: the printing artwork is easy to peel off, but it can be selected at will. Color to increase the eye-catching effect. Considered from the perspective of cost, the price of laser marking machines is between 10 to 200,000 yuan, and the investment is large. The price of printing machines is only about 15,000 yuan, and the investment is much smaller.
The use of etching methods to obtain images is also a common practice to replace laser marking. The eyeglass industry usually uses ferric chloride solution to make etching texts. However, one of the potential threats to the etching technique is the destruction of the environment. Today, the use of the technology in the society is becoming more and more important.
Control of printing elements
The most significant feature of pad printing is indirect printing. The biggest advantage of indirect printing is that it maintains the independence of the position of the printing plate and the substrate. The change in the shape of the pad of the printing pad that transfers the ink on the printing plate to the surface of the substrate causes the shift. India's adaptability to the shape of the substrate has greatly increased.
Now we will give a brief introduction of the printing process technology involved in the printing of glasses, so that we can understand the application of pad printing technology in the optical industry.
1, ink selection
Ink selection plays a very important role in pad printing technology, which is widely related to the printing materials involved in pad printing technology. Because the frames are made of metal, the adhesion of the ink to the metal surface is required to be better. Nowadays, two-component inks are generally used, and the drying mode is dry. Lens printing requires glass inks, glass inks are usually two-component inks, and the drying method is dry. The two-component ink cured ink layer has high hardness and good adhesion, but the operation is slightly more troublesome.
The usage of two-component inks is briefly described as follows:
(1) First, according to the ink instructions, the hardener is added to the ink and stirred uniformly, and is poured into an oil pan for printing. Since the two-component ink slowly cures, control the dosage.
(2) The printing should be placed in a drying oven to speed up the drying process. Two-component inks generally have a drying time of up to 10 hours at room temperature, which can affect the production efficiency. The drying method is ideal. Usually, the drying temperature is between 150° C. and 180° C. and the time is 5 to 10 minutes. .
2. Printing plastic head
The choice of pad printing head in the pad printing process is crucial. First of all, the shape of the print head should be able to print to the specified position, and secondly, the deformation should be smaller. Because the printing area of ​​the frame is very small, the printing head should be slightly sharper. Through testing, the A7 plastic head with a cross-sectional area of ​​38 mm is suitable. The printing effect of the A3 rubber head is also very good, but due to the slightly smaller cross section, the printing distortion is slightly larger.
The hardness of the printing head is another indicator that should be taken into consideration when selecting the printing head. The flexibility of the rubber head is wider, but the printing text is greatly deformed. Especially for products that are as small as eyeglass frames, the graphic font is very small. The graphic distortion is very easy to make the graphic lines stick together and become blurred. Therefore, it is better to choose a stiffer plastic head. Our test The result is a plastic head with a Shore hardness of 32 degrees to achieve the best print quality.
The selection of the plastic head for the printing of the nose pads shall take into account the limitations of the position. A plastic head with a smaller cross-sectional area shall be selected. Our test result is that the plastic head with a cross-sectional area under 15 mm is more suitable and the hardness should be above 32 degrees.
3. Steel plate
The printing plate of the pad printing machine is a steel plate. The method of producing the steel plate is an etching method. The printing frames of the frame and the lens are very small, so the size of the steel plate does not need to be too large. In accordance with the printing industry standards, the use of 75mm × l00mm and 100mm × 100mm two kinds of steel plates can be, but the longest side of the image frames printed frame length is only 20mm, so the text can use 75mm × 100mm steel plate.
The steel plate is manufactured using a conventional etching method. Due to the small size of the font and the short exposure time, a uniform steel plate can be obtained.
In the production of steel plates, depth control is a major indicator. Too deep depths can easily cause stencils, and the transfer of ink is affected, and the strokes of the fonts are likely to be uneven in thickness, the pitch between the strokes becomes smaller, and the sharpness decreases. The disadvantage of being too shallow is also obvious. This is because the color saturation of the font is not high and the color is difficult to achieve eye-catching effects. Our test results are ideal for depth control at 19 μm.
4. Printing machine
The frame of the spectacle frame has a small printing area and is only a trademark of a printing company. Therefore, it does not involve complicated graphics or color registration, and a small-area pad printer with a single color should be selected as the machine.
5. Fixture
In the special printing industry, making jigs is a basic job. In general, the production jig is mainly to ensure that the printing area of ​​the substrate and the plastic head have relatively fixed positions, so as to ensure the unity of the printing of the product. At the same time, it is easy to realize overprinting when multi-color overprinting is involved, so the position of the fixture in the pad printing process is indispensable. The inner edge of the spectacle frame is the area for printing images, and this position must be clamped by the clamp to ensure parallel with the print head. During the printing process, the spectacle frame cannot be loosened, and the fastening effect is required. The use of crystal glue cast fixtures should be preferred.
The method of casting the crystal glue is based on the principle that the unsaturated polyester resin solidifies under the action of the hardener, and it is very easy to cure according to the shape of the product. No matter how complicated the structure of the spectacle frame is, the jig produced by this method can fix the spectacle frame well and meet the printing requirements. The production method is: First, the resin A component and the B component are mixed and mixed uniformly into a previously prepared paper type until the resin is in a gelled state, and the spectacle frame can be removed.
Although the printing of frames and lenses is a very simple process, it can be seen from this that the characteristics of the printing process are:
Pad printing is very suitable for products with small printing area and irregular printing position; it is the specific parts of the optical products that need to be printed that make the printing process wonderfully applicable.
From the point of view of the printing process, in order to achieve an exquisite printing effect, the selection of a high-quality printing ink and a relatively high hardness printing head are two factors that must be considered.
The printing effect is inextricably linked with the fixture quality.
Conclusion
The application of the pad printing process in the eyewear industry illustrates at least two problems: First, any company wants to gain more market share in the ever-changing market, in addition to constantly improving the level of technology in the manufacturing process, the characteristics of its products The use of various decorative methods to show that it is becoming a matter of increasing concern to corporate managers. For the vast majority of consumers, eye-catching product information and instructions are more likely to inspire their desire to buy.
Another problem is: Since the mankind began to manufacture the first product, although gradually understand the work, but the division of labor can never be separated from the internal links between the industry, especially with the printing. When people are at a loss in the fierce market competition, they may wish to look into another industry and may find new inspiration. Pad printing is an industry that is easy to inspire. With a little brains, a creative solution will soon be created. With these sophisticated solutions, no one will fear any competitors.
The market economy is cruel and fair, and those creative ideas are constant. Companies that are good at eating crabs often take the lead. We respected the first company that applied the printing process to the optical industry. They have already taken the lead. We would also like to promote companies that will expand the printing process to new areas in the future. Similarly, they will also walk in the industry. cutting edge.
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