China Xiamen Juguangli Import & Export Co., Ltd Company News

Screen printing process has high requirements for the pattern, so it will appear in some silicone buttons and silicone protective sleeves and other processes. The ink of the product is more important for the screen printing process, and the quality of the ink will improve the quality of the pattern. While some products have faded after long-term use, there are mainly several reasons leading to the fading phenomenon of the product: 1. The baking temperature of silica gel products after screen printing is too low and the time is short, which leads to poor wear resistance of silica gel products characters printed out by screen printing, and the characters begin to become blurred after several times of use; 2, screen printing ink quality is too poor, affect the surface of silicone products; 3. The surface of silica gel products is too dirty, which prevents the adsorption of silkscreen ink and silica gel, causing the character to be wiped away.

In addition to some thermoplastic silicone which does not require vulcanization, both natural rubber and synthetic silicone rubber need to use vulcanizing agents to vulcanize. After vulcanization, silicone rubber has a high application value, and its mechanical properties are greatly improved. In order to avoid direct contact with metal Kun friction attack of static fire, advocate plastic wrap, and then participate in the Kun cylinder mixing. This product is very sensitive to the static electricity of open fire, the rubber mixer should be grounded. Pour cold or hot water off the oil. There are some silicone products manufacturers, mainly using food grade silicone. When the vacuum degree is guaranteed and the vacuum time is coming, pay close attention to the high temperature. If the material temperature still does not meet the process requirements after the vacuum time arrives, it should continue to vacuum and continue to heat until the material temperature meets the requirements. The regeneration of silica gel after adsorption of organic impurities, roasting method for coarse pore silica gel, can be gradually heated in a baking furnace, about 1 hour later the rubber granules will be white or yellow brown. In addition to this role, methyl diphenyl Rtemperature vulcanized silicone rubber in addition to this role, but also has a wider use temperature range than methyl indoor Rtemperature vulcanized silicone rubber.  

Silica gel products in the forming, if the vulcanization temperature is increased, the vulcanization time can be shortened, the vulcanization efficiency will be effectively improved, so many Dongguan silica gel products factory vulcanization molding practitioners in the early stage in order to speed up the molding speed of silica gel, rubber products, will start on the increase in temperature. Sometimes it is really effective to shorten the curing time, but sometimes it will be self-defeating, not only did not improve the capacity, but also a lot of numbness and rupture, what is this? In fact, silicone, rubber vulcanization temperature cannot indefinitely increasing, because of the silicone and rubber is a polymer, high temperature can cause the rubber chain output cracking reaction, crosslinking rupture, resulting in "sulfide to return the original" phenomenon, resulting in a decline in the physical and mechanical properties of the silicone, rubber products, namely we often say change and burst. ES According to the experience accumulated in the production process of some silica gel products, the common silicone and rubber vulcanization temperature recommendations are as follows: Natural rubber (NR) vulcanization temperature recommended: the most reasonable range :140~150℃, not more than 160°C; Recommended curing temperature of butadiene rubber (BR), isoprene rubber (IR) and neoprene rubber (CR) : the most reasonable range :150~160℃, not more than 170C; Styrene butadiene rubber (SBR), nitrile butadiene rubber (NBR) curing temperature suggested: curing temperature can be used more than 150℃, but not more than 190℃; Recommended curing temperature of butyl rubber (IR), EPDM: the most reasonable range of 160~180℃, not more than 20O°C; Hot vulcanized silica gel [SR], fluorine rubber (FR) vulcanization temperature recommendation: the most reasonable range of 170~180℃, if the need for secondary vulcanization, the secondary vulcanization temperature control in 200~230℃, time according to the process requirements within 4~24H. Vulcanization of rubber products three elements: temperature, time, pressure. When the pressure is certain, the high temperature curing time is short, on the contrary, the low temperature curing time is longer. Rubber polymer, in the state of high temperature will make the molecular chain damage, leading to cross-linking bond fracture, that is, the phenomenon of "vulcanization back to the original". After the vulcanization temperature is determined, the pressure and time will be determined because the equipment and abrasive tools are existing in the enterprise. Vulcanization temperature selection generally considered raw gum varieties and vulcanization system selection to consider: The vulcanization temperature range of ordinary sulfur vulcanization system is 130~158°C; Effective and semi-effective curing system curing temperature range 160~165℃; The temperature of the resin or peroxide vulcanization system is between 170 ° C and 180° C. Thick products or line products choose low temperature long time vulcanization, thin products high temperature rapid vulcanization. Hard products choose low temperature vulcanization, slow down the speed of reaction heat generation, contribute to heat dissipation, so that the product internal temperature is reduced to meet the vulcanization is not easy to burst.

First, we should understand the characteristics of the silicone button The hardness of the silicone button is generally about 45°. The single key surface of the printing has convex, concave solitary surface and plane, all of which are field line printing. In addition to requiring accurate position and clear graphics, printing ink is also required to be suitable for printing silica gel, the ink layer reaches a certain thickness, has strong adhesion and wear resistance, and does not change color or fall off after high temperature baking. Therefore, it puts forward special technical requirements for the screen printing process. Two, the production method of screen printing screen There are many methods of screen printing plate making, mainly using the photographic plate making method, that is, the sensitive adhesive is directly coated on the net, after drying to form a certain thickness of the sensitive film to become the graphic carrier, the process is: Select net, select frame, stretch net, clean screen, dry, coating photosensitive adhesive, exposure, development, printing The specific process is as follows: 1. Net frame Generally use aluminum alloy, easy to operate, strength is not easy to deformation. Before the mesh with cyclohexanone wipe the mesh frame, remove the residual grease and dirt, and then wipe with industrial alcohol, after cleaning with water, and then dry the mesh frame. In the operation of the screen printing plate, it is necessary to dry several times, so the drying condition and cleaning should be strictly controlled. 2. Stretch mesh The first selection of silk screen, rubber screen printing using nylon wire mesh, ink through the screen rate is good, constant tension, choose to cover the edge of the mesh frame and more than 6 ~ 10Cm mesh outside the mesh frame, using pneumatic mesh machine mesh, and tension meter for six point test, reach the required tension, coated with universal adhesive so that the screen stick to the mesh frame, with hot air blowing to speed up drying, After about 5mInR of bonding, you can turn off the mesh machine, the excess screen glued on the outside of the mesh frame, in order to maintain the bonding fastness of the screen. Cut off the excess screen, with cyclohexanone, industrial alcohol after cleaning the net surface dry. If the tension of the stretched net is unstable, it may cause the font offset and fuzzy, and there is a chord surface substrate resulting in the difference in the thickness of the ink layer. Flat orthographic printing requires a large tension screen, a camber printing surface requires a small tension screen, the process of the application of the screen tension range is 3N/Cm ~ 7N/Cm. Generally, the screen with large tension has a short service life. The process should be selected according to the needs: 100 straight yarn screen for printing conductive ink, 200 ~ 300 diagonal screen for printing positive characters and color blocks, in order to ensure the thickness of the ink layer and the integrity of the picture and text.

First, we should understand the characteristics of the silicone button The hardness of the silicone button is generally about 45°. The single key surface of the printing has convex, concave solitary surface and plane, all of which are field line printing. In addition to requiring accurate position and clear graphics, printing ink is also required to be suitable for printing silica gel, the ink layer reaches a certain thickness, has strong adhesion and wear resistance, and does not change color or fall off after high temperature baking. Therefore, it puts forward special technical requirements for the screen printing process. Two, the production method of screen printing screen There are many methods of screen printing plate making, mainly using the photographic plate making method, that is, the sensitive adhesive is directly coated on the net, after drying to form a certain thickness of the sensitive film to become the graphic carrier, the process is: Select net, select frame, stretch net, clean screen, dry, coating photosensitive adhesive, exposure, development, printing The specific process is as follows: 1. Net frame Generally use aluminum alloy, easy to operate, strength is not easy to deformation. Before the mesh with cyclohexanone wipe the mesh frame, remove the residual grease and dirt, and then wipe with industrial alcohol, after cleaning with water, and then dry the mesh frame. In the operation of the screen printing plate, it is necessary to dry several times, so the drying condition and cleaning should be strictly controlled. 2. Stretch mesh The first selection of silk screen, rubber screen printing using nylon wire mesh, ink through the screen rate is good, constant tension, choose to cover the edge of the mesh frame and more than 6 ~ 10Cm mesh outside the mesh frame, using pneumatic mesh machine mesh, and tension meter for six point test, reach the required tension, coated with universal adhesive so that the screen stick to the mesh frame, with hot air blowing to speed up drying, After about 5mInR of bonding, you can turn off the mesh machine, the excess screen glued on the outside of the mesh frame, in order to maintain the bonding fastness of the screen. Cut off the excess screen, with cyclohexanone, industrial alcohol after cleaning the net surface dry. If the tension of the stretched net is unstable, it may cause the font offset and fuzzy, and there is a chord surface substrate resulting in the difference in the thickness of the ink layer. Flat orthographic printing requires a large tension screen, a camber printing surface requires a small tension screen, the process of the application of the screen tension range is 3N/Cm ~ 7N/Cm. Generally, the screen with large tension has a short service life. The process should be selected according to the needs: 100 straight yarn screen for printing conductive ink, 200 ~ 300 diagonal screen for printing positive characters and color blocks, in order to ensure the thickness of the ink layer and the integrity of the picture and text.

Conductive black particles. These conductive black particles are the most common and most common, found on many buttons. They are usually round with a grid pattern and have a resistance of around 100Ω. The shape can also be customized, requiring an additional black die for punching. Conductive ink. With conductive materials (gold, silver, copper and carbon) dispersed in the binder made of paste ink, has a certain degree of conductive properties, when the ink drying is poor, resistance value will increase, so also need to bake under infrared. Gold-plated grains. Conventional conductive black particles have a resistance of around 100Ω, while gold-plated particles can keep the resistance within 1Ω. The lower the resistance value, the higher the sensitivity of the key, therefore, gold plated particles are often used on the silicone button with higher sensitivity requirements. Such as military keys, car keys, instrument silicone keys and so on.....

Silica gel is a thermosetting elastomer, has the advantages of safety and non-toxic, insoluble in water and any solvent, non-toxic and tasteless, stable chemical properties, in addition to strong alkali, hydrofluoric acid does not react with any substance, high adsorption performance, good thermal stability, chemical stability, widely used in adult products, food products. TPE is a thermoplastic elastomer with environmental protection, non-toxic, easy coloring, smooth and soft feel, hardness range 0A-120A, simple processing, no need for vulcanization processing, can be recycled, reduce costs. Can be coated with PP, PE, PC, PS, ABS and other plastic materials bonding (secondary injection molding), can also be molded separately.  

P+R button is one of many electronic product keys. It's a button made of plastic and silicone. P means Plastic and R means Rubber. P + R buttons are normally used in the bank password button, the dictionary on the key, tablets, more advantages have many: generous special appearance, texture is tenacious, to customize according to customer's requirements, appearance and size of the different material thickness, can undertake a variety of processing technology, the formation of different fonts, different color or design; Toughness is very good, not easy to break, feel is also very good. Our company is a focus on P+R buttons, silica gel products customized manufacturers, the factory has perfect production equipment, complete production line and senior technical team. For P+R key quality requirements are very demanding, a special quality inspection department to test the product.

Since transparent silica gel products are transparent how possible yellow, yellow can be transparent, what reason is that caused? Is it oxidation? Normal transparent silica gel products are put for several years will not yellow, but sometimes we are in production, some transparent silica gel products just out of the oven will yellow, the transparent silica gel products why yellow? The main problem lies in the following aspects: I. vulcanizing agent 1 vulcanizing agent performance is divided into common type and yellow resistance. Its application scope has the following two aspects: 2. Common type of non-yellow vulcanizing agent, used in some can be used for color is dark or the color is not high requirements of non-exposed silica gel products. 3. Anti-yellow vulcanizing agent should be used in products that need to be exposed, light and bright color, and have high requirements for color. The quality of vulcanizing agent is highly correlated with hydrogen silicone oil. Dow Corning contains hydrogen silicone oil with hydrogen value above 1.6. Acid value below 1, the effect is better. Two. The process Transparent silica gel products in the forming, leading to transparent silica gel products in the forming after the color of yellow main problems are: 1. The mold temperature is too high; 2. Too long curing time; 3. After adding sulfur twice. The raw material itself is of poor quality Sometimes we add anti-yellow vulcanizing agent in the rubber compound, but the transparent silica gel product still looks yellow after molding. It may be that the anti-yellow ability of the raw material is too poor. The raw material is suggested to be directly refueling. Conclusion: Although silicone products have excellent weather resistance and aging resistance. But sometimes the silicone products that have just come out of the oven turn yellow. In order to avoid this situation, according to the requirements of the selection of vulcanizing agent, process to strictly control the temperature of the mold and product vulcanization time, raw materials should pay attention to the yellow resistance of raw materials.

1, silicone keyboard has environmental protection, non-toxic tasteless, and good elasticity; 2, wear resistance, high temperature resistance, no deformation and other characteristics, can be used for a long time; 3, smooth appearance, feel strong, is a real green environmental protection products; 4, can do monochrome, two colors, three colors and other colors mixed; 5, the LOGO on the jewelry can be text, pattern or the combination of text and pattern. Silicone key production process Silicon is high temperature vulcanized rubber as the main raw material by molding molding process and the production of silicone rubber products. A finished silicone key needs to go through the following processes: First, raw material preparation (also called mixing glue, material preparation, etc.) : including raw glue mixing, color matching, raw material weight calculation, etc.; Two, curing molding (also called oil molding) : using high pressure curing equipment after high temperature curing, so that silica gel raw materials into solid molding; Three, the peak (also known as processing, burr, etc.) : silica gel products removed from the mold will be associated with some useless burr, hole debris, need to be removed; At present, in the industry, this process is completely completed by hand, some factories are also useful punch to complete; 4. Screen printing: This process is only used in some silica gel keyboards with patterns on the surface, such as English letters and Arabic numerals on the silica gel keyboard. In order to facilitate the user to operate the keys, it is often necessary to screen print the corresponding characters corresponding to the mobile phone keyboard in the corresponding position; Five, surface treatment: surface treatment including dust removal with air gun; Six, oil injection: silica gel keyboard in the ordinary state is easy to absorb the dust in the air, and has a certain viscosity. Spray a thin layer of feel oil on the surface of the silicone key, which can not only prevent dust but also ensure the feel; 7. Others: Other processes include some additional functions given by the silicone keyboard by the business, such as glue dropping, radium carving, P+R synthesis, optimized packaging, and assembly of other materials and components.