SMT patch red plastic basic knowledge and application guide
SMT patch red plastic guide on the basic knowledge and application of SMT assembly red plastic: SMT patch red plastic is a thin polymer compound, and solder paste is different is its heat after curing, the freezing point temperature of 150 ℃, then , starting from the red gum paste directly into a solid body. SMT patch red plastic nature of the SMT patch red plastic with a viscosity of liquid, temperature characteristics, wetting characteristics.
SMT patch red plastic basic knowledge and application guide
About SMT patch red plastic: SMT patch red plastic is a thin polymer compound, and solder paste is different is its heat after curing, the freezing point temperature of 150 ℃, then, starting from the red gum paste directly change the body into a solid.
SMT patch red plastic nature of the
SMT patch red plastic with a viscosity of liquid, temperature characteristics, wetting characteristics. According to this feature of the red plastic, so in production, the use of red rubber aim is to make the parts firmly pasted on the PCB assembly surface to prevent it from falling.
SMT patch red plastic applications
Use in printing or dispenser 1, in order to maintain the quality of adhesive patch, please put the refrigerator cold (5 ± 3 ℃) Storage 2, removed from the refrigerator before use, should be at room temperature 2 to 3 next time 3 hours, toluene or ethyl acetate can be used to clean the hose dispensing: 1, at the point in Jiaruhouse hose, you can get a more stable point of glue 2, the recommended dispensing temperature of 30-35 ℃ 3, sub-decorated hose, use a special glue dispensing machines for packing, to prevent blowing bubbles in the glue is mixed with glue: The recommended temperature is 30-35 ℃ scraping gum Note: red gum removed from the refrigerated environment, the reach room temperature can not be opened before use. To avoid contamination original products may not be used in any adhesive patch back into the original packaging.
SMT patch red plastic craft way
1) Printing: Stencil holes carved parts according to the type of substrate to determine the performance of its thickness and hole size and shape. The advantage is speed and efficiency. 2) dispensing methods: dispensing is the use of compressed air, the red plastic dispensing head through a dedicated point to the substrate, the size of the gel-point, how much, by the time pressure to control parameters such as diameter, flexible dispenser function. For different parts, we can use different dispensing head, set the parameters to change, you can change the shape and number of gel-point, in order to achieve the desired effect, is convenient, flexible and stable. Drawback is that bubbles tend to have a drawing and so on. We can work parameters, speed, time, pressure, temperature adjustment, to minimize these shortcomings. 3) needle to the way, is to film a special needle, immersed in shallow plastic tray with a gel-point of each needle, when the gel point of contact with the substrate, they will out of the needle, the glue can be found by the shape and diameter of the needle to change. Curing temperature of 100 ℃ 120 ℃ 150 ℃ 150 seconds curing time 5 minutes 60 seconds typical curing conditions: Note: 1, the higher the curing temperature and longer curing time, bonding strength is stronger. 2, the adhesive patch of the substrate temperature with the size and placement location of components vary, we recommend to identify the most suitable curing conditions. Red plastic storage: store at room temperature for 7 days when stored at less than 5 ℃ than 6-months, in 5 ~ 25 ℃ can store more than 30 days.
SMT patch red gum management
As SMT patch red plastic itself affected by temperature with viscosity, fluidity, wetting and other properties, so SMT patch red plastic to have a certain use conditions and standardized management. 1) Red plastic water have specific numbers, according to the amount of feed, date, type to number. 2) red plastic to put 2 ~ 8 ℃ refrigerator to save, to prevent changes in temperature affect the properties. 3) red plastic back next time at room temperature and temperature requirements 4 hours, according to the order of FIFO use. 4) For the dispensing operation, the red rubber hose to deaeration, the one unused red plastic refrigerator should be back, old rubber with new rubber can not be mixed. 5) to accurately fill out the temperature records back to the table, warm people and warmed back to the time, the user must confirm OK warmed before use. Typically, the red plastic can not use expired.