存放在較高溫度或超過保存期限時會出現什麼問題?

焊膏應存放在冰箱中,並且有保質期. 但當它儲存在較高溫度或超過保存期限時,到底會出現什麼問題呢??

Solder paste is composed of metal micro balls and flux. The metal doesn’t change over time much, but the flux does. Any solvent that maintains flux viscosity can ‘dry upover time and the total mixture becomes less viscous. This is a problem in a manufacturing environment because it can lead to improper flux distribution along a footprint during the stenciling process (especially if the flux balls up or has an affinity for itself more than what it is being dispensed onto).

This is mostly a problem in large PCB assembly lines.

  • If you have any part of the process that doesn’t function well, the total production yield goes down. And you have to spend time hand-working your designs (like with a tombstone SMT part).
  • If you were producing quantities above 10000, this could become a problem very fast. So you try to control every aspect of the design to increase the yield. Bad paste isn’t something that assemblers want to deal with. Critical processes, such as medical or aerospace, will also require designers to follow expiration dates on solder.

#PCB組裝

奧利佛史密斯

奧利佛史密斯

Oliver 是一位經驗豐富的電子工程師,擅長 PCB 設計, 類比電路, 嵌入式系統, 和原型製作. 他的深厚知識涵蓋原理圖捕捉, 韌體編碼, 模擬, 佈局, 測試, 和故障排除. Oliver 擅長利用他的電氣設計才能和機械才能將項目從概念到大規模生產.
奧利佛史密斯

奧利佛史密斯

Oliver 是一位經驗豐富的電子工程師,擅長 PCB 設計, 類比電路, 嵌入式系統, 和原型製作. 他的深厚知識涵蓋原理圖捕捉, 韌體編碼, 模擬, 佈局, 測試, 和故障排除. Oliver 擅長利用他的電氣設計才能和機械才能將項目從概念到大規模生產.

其他人在問什麼

PCB板焊接時SMT焊盤為何容易脫落?

我是一家電信公司的採購員. 最近, 因供應商生產精細化導致SMT PCBA重要訂單延誤. 我正在考慮更換它,只是很困惑他們的 SMT 焊盤在焊接 PCB 板時怎麼容易脫落. 這會減慢整個過程.

我可以製作沒有接地層的 PCB嗎?

最近我們正在開發一種便攜式設備,它應該非常小而且輕. PCB設計方面, 我在想排除地平面以最小化產品尺寸是否是一個好主意.

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