Note on SMT red plastic:
Basic knowledge of SMT red plastic
1. About Red Glue: SMT SMD Red Glue is a kind of poly-dilute compound. Unlike solder paste, it is cured after being heated. Its freezing point temperature is 150 ° C. At this time, the patch red glue starts to be paste-like. A process in which the body becomes a solid directly.
Second, the nature of red plastic: SMT patch red plastic has viscosity fluidity, temperature characteristics, wetting characteristics. According to this characteristic of red plastic, in the production, the purpose of using red plastic is to make the parts firmly adhere to the surface of the PCB to prevent it from falling.
Management of red plastic:
Because SMT patch red glue is affected by temperature, it has its own characteristics of viscosity, fluidity, wetting, etc., so the patch red glue must have certain conditions of use and standard management:
(1) Dispensing red glue should have a specific serial number, which is numbered according to the quantity, date and type of feed.
(2) It should be stored in a refrigerator at 2~8 °C to prevent the influence of temperature due to temperature changes.
(3) The temperature recovery requirement is to return to temperature for 4 hours at room temperature and use in the order of first in, first out.
(4) For the dispensing operation, the rubber red rubber should be defoamed. For the disposable red plastic, it should be put back into the refrigerator for storage. The old rubber and the new rubber should not be mixed.
(5) To accurately fill in the temperature return record, return to the temperature and return time, the user needs to confirm the return temperature can be used.
Usually, red glue is not available for expired
Basic knowledge of red plastic:
1. About red plastic: Red plastic is a kind of poly-dilute compound. Unlike solder paste, it is cured after being heated. However, the freezing point temperature is 150 ° C. At this time, red plastic begins to change from paste to solid. .
Second, the nature of red plastic: red plastic has viscosity fluidity, temperature characteristics, wetting characteristics. Therefore, according to this characteristic of red plastic, in the production, the purpose of using red plastic is to make the parts firmly adhere to the surface of the PCB to prevent it from falling.
SMT red glue application - used on printing presses or dispensers.
1. In order to maintain the quality of the patch adhesive, please store it in the refrigerator (5±3 °C);
2. Before taking it out of the refrigerator, it should be warmed for 2~3 hours at room temperature;
3. The hose can be cleaned with toluene or ethyl acetate.
Dispensing:
1. Add a back plug to the dispensing tube to obtain a more stable dispensing amount;
2. The recommended SMT dispensing temperature is 30-35 ° C;
3. When disassembling the SMT red hose, please use the special glue moisture installation machine to disassemble to prevent air bubbles from being mixed in the glue.
Squeegee: The recommended wiper temperature is 30-35 °C.
Note: After the red glue is removed from the refrigerated environment, it cannot be opened before reaching the room temperature. To avoid contamination of the original product, do not return any used patch adhesive to the original packaging.
Production application:
Applied to SMT red plastic-sMD adhesive, also known as SMT adhesive, SMT red plastic, it is a red paste with a uniform distribution of hardener, pigment, solvent, etc., SMT patch red plastic mainly Used to fix components on a printed board, usually by dispensing or stencil printing. After attaching the components, put them in an oven or reflow soldering machine to heat harden. SMT patch red glue is not the same as the so-called solder paste. Once it is hardened by heat, it will not melt even after heating. That is to say, the thermal hardening process of the patch glue is irreversible.
The use of SMT patch adhesives may vary depending on the conditions of the heat curing, the materials to be joined, the equipment used, and the operating environment. When using, choose the patch glue according to the production process.