打膠機點膠時的三個常見缺陷
打膠機點膠時的常見缺陷的存在，如果不及時處理，很容易在生產中造成質量問題，甚影響各種性能的展示。那么下面就來講講相關內容吧。
If the common defects of the glue dispenser are not handled in time, it is easy to cause quality problems in production and even affect the display of various performances. Now let's talk about the relevant content.
膠水的牽拉和拖尾是點膠過程中的普遍現象。即使是專為高速點膠而配制的膠水也可能出現拉絲現象，膠水更容易脫落，還可能造成虛焊等。這可能是因為打膠機設備的工藝參數調整不當，比如針頭內徑太小、點膠壓力太大、針頭與PCB距離過大等。
The pulling and trailing of glue is a common phenomenon in the dispensing process. Even the glue specially prepared for high-speed dispensing may cause wiredrawing, which makes the glue easier to fall off, and may also cause faulty welding. This may be due to improper adjustment of process parameters of the glue applicator equipment, such as too small inner diameter of the needle, too large dispensing pressure, too large distance between the needle and PCB, etc.
另一個原因可能是對膠粘劑的性能了解不夠，膠粘劑與應用工藝不兼容，或者膠粘劑質量差、粘度變化或已過期。拉線/拖尾也可能是由其他原因引起的，例如對板的靜電放電、板的彎曲或板的支撐不足等。
Another reason may be the insufficient understanding of the properties of the adhesive, the incompatibility between the adhesive and the application process, or the poor quality, viscosity change or expired of the adhesive. The stay wire / tailing may also be caused by other reasons, such as electrostatic discharge to the plate, bending of the plate or insufficient support of the plate.
針對以上原因，可以調整工藝參數，更換內徑較大的針頭，降低點膠壓力，調整針頭距離PCB的高度；同時檢查所用貼片膠的生產日期、膠的性能和使用要求，是否適合該工藝、涂層等。如果貼片膠確實變質，可以更換。此外，實踐證明，控制拉絲/拖尾的好的方法是在點膠針上或附近加熱，以降低粘度，貼片膠易斷裂，不會產生拉絲/拖尾。
For the above reasons, the process parameters can be adjusted, the needle with larger inner diameter can be replaced, the dispensing pressure can be reduced, and the height between the needle and PCB can be adjusted; At the same time, check the production date of the used patch adhesive, the performance and use requirements of the adhesive, and whether it is suitable for the process, coating, etc. If the patch adhesive is indeed deteriorated, it can be replaced. In addition, practice has proved that a good way to control wire drawing / tailing is to heat on or near the dispensing needle to reduce the viscosity. The patch adhesive is easy to break and will not produce wire drawing / tailing.
沒有時間打印或膠量太少。點膠時有一點點膠動作，但沒有出膠或針頭出膠太小。可能是貼片膠中混入了氣泡，針頭被堵住，或者生產線氣壓不夠。這時候注射器內的膠水要去泡，尤其是自己裝的膠水。經常更換干凈的針頭，適當調整機器壓力。如果經常發生堵塞，可以考慮更換其他的貼片膠。
No time to print or too little glue. There is a little glue action during dispensing, but there is no glue output or the glue output of the needle is too small. It may be that bubbles are mixed in the patch adhesive, the needle is blocked, or the air pressure of the production line is not enough. At this time, the glue in the syringe should be soaked, especially the glue installed by yourself. Always replace clean needles and properly adjust the machine pressure. In case of frequent blockage, consider replacing the patch adhesive of other brands.
明顯不連續的膠點。
雙組份打膠機廠家認為不連續的點尺寸會影響組件和PCB之間結合強度的整體一致性。出現這種現象的原因如下：針的頂針落在墊子上，換一根針就可以解決問題；恢復時間也不夠。增加延遲可以解決恢復問題。然后或隨著膠面水平下降，壓力時間不足以完成點膠周期，可以通過增加壓力與周期時間的比例來糾正膠點尺寸不連續的問題。
Obviously discontinuous glue spots. The manufacturer of the two-component glue applicator believes that the discontinuous point size will affect the overall consistency of the bonding strength between the component and PCB. The reasons for this phenomenon are as follows: the thimble of the needle falls on the mat, and changing a needle can solve the problem; Recovery time is not enough. Increasing latency can solve the recovery problem. Then, or as the glue surface level drops, the pressure time is not enough to complete the dispensing cycle. The problem of discontinuous glue dot size can be corrected by increasing the ratio of pressure to cycle time.
The common defects of the dispenser during dispensing are explained in three aspects here. You can pay attention to our website www.jntiannuo Learn more about consulting.
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