Tuesday, March 5, 2013

Some Knowledge about SMT Red Adhesive

The process SMT red glue

First, Printing: Stencil engraved hole according to the type of part, the performance of the substrate to determine its thickness and the size and shape of the hole. The advantage of smt adhesive is speed, high efficiency. Second, Dispensing: Dispensing is the use of compressed air, the red plastic glue through a dedicated point head points to the substrate, the size of the gel-point, how much, by the time the pressure tube diameter and other parameters to control, dispenser with flexible function. For different parts, we can use different dispensing head, set the parameter to change, you can also change the shape and number of glue points, in order to achieve the desired effect, and the advantage is convenience, flexibility, stability. The disadvantage is that easy drawing and bubble. Operating parameters, speed, time, pressure, temperature adjustment, we can minimize these shortcomings. Third, needle turn, a special needle membrane immersed in a shallow plastic tray each needle with a glue dot will be out of the needle, when the gel-point contacting with the substrate, the amount of glue by needle shape and diameter to change. The curing temperature of 100 °C to 120 ° C to 150 °C the curing time of 5 minutes to 150 seconds 60 seconds. Typical curing conditions: Note: 1, the higher the curing temperature and the curing time is longer, the adhesive strength, the stronger. 2, the temperature of the plastic patch will change with the different parts of the substrate size and placement position, so we propose to identify the most suitable curing conditions. Red plastic storage: can be stored at room temperature for 7 days, less than 5 ℃ storage is greater than in June, can store more than 30 days at 5 ~ 25 ℃.

SMT Adhesive

SMT patch red plastic management

SMT patch red plastic is affected by its viscosity, flow and wetting properties temperature, so SMT patch red plastic should have certain conditions of use and specification management. First, red plastic should have the specific serial numbers, and should be numbered according to the number of feed, date and type. Second, red plastic should be stored in 2 ~ 8 ℃ in the refrigerator to prevent the change in the characteristics of adhesive sealant due to temperature changes. Third, for the dispensing, hose red plastic needs defoaming and the unused disposable red plastic should be put it in the refrigerator and the old plastic cannot be mixed with new plastic. Fourth, we should accurately fill out the temperature records table, back to the temperature and the return temperature of the time, users need to confirm the temperature before use. Typically, the expired red plastic cannot be used.

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This article is come from:http://www.soundspeakers.cn/index.php/some-knowledge-about-smt-red-adhesive.htm

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