怎么區分汽車車燈大燈是熱膠還是冷膠？
冷膠和熱膠大的區別就是熱膠是可逆的，就像水能變成冰，冰又回到水。熱膠固化后把燈放到烘箱120度烘烤，膠水基本就軟了。冷膠不可逆，就像雞蛋煮熟后永遠變不回去。
The big difference between cold glue and hot glue is that hot glue is reversible, just as water can turn into ice, and ice returns to water. After the hot glue is cured, put the lamp in the oven for 120 degrees to bake, and the glue is basically soft. Cold glue is irreversible, just like an egg that never changes after it is cooked.
每個大燈的結構都不同，采用的燈泡功率也不太一樣，有的燈內溫度高，有的溫度低一點。一般設計的時候根據燈內的溫度車廠膠水的種類由主機廠來決定膠水。熱膠的穩定性比較好，氣密性能較好， 冷卻固化時間基本在3分鐘左右，冷膠基本要24小時以上。且冷膠都要進行等離子預處理，多道工藝，氣密性能比較難保證。
The structure of each headlamp is different, and the bulb power used is also different. Some lamps have a high temperature, and some have a low temperature. In general, the type of glue recommended by the vehicle manufacturer is determined by the main engine manufacturer according to the temperature in the lamp. The hot adhesive has good stability and air tightness. The cooling and curing time is basically about 3 minutes, and the cold adhesive is basically more than 24 hours. In addition, the cold adhesive shall be subject to plasma pretreatment, and the multi-channel process makes it difficult to ensure the air tightness.
現今大多數車輛的大燈都是熱膠的，因為這樣的大燈生產成本低，且技術成熟。也有少部分是冷膠的，因為冷膠的大燈生產成本相對較高，而且工序復雜，大燈的氣密性也低。
Nowadays, the headlights of most vehicles are hot glue, because the production cost of such headlights is low and the technology is mature. A few of them are cold glue, because the production cost of cold glue headlamp is relatively high, and the process is complex, and the air tightness of headlamp is also low.
此外大燈冷膠開殼的注意事項：
In addition, precautions for headlight cold glue shell opening:
注意事項一：冷膠其實也有它的弱點，冷膠必須要加熱到一定溫度。
Note 1: cold glue also has its weakness. Cold glue must be heated to a certain temperature.
注意事項二：不要局部加熱，要用烤箱整體加熱。
Note 2: do not heat locally, but use the oven as a whole.
注意事項三：只加熱一次遠遠不夠，少要反復加熱到3-5次以上。
Note 3: heating only once is not enough. At least repeat heating for more than 3-5 times.
注意事項四：每次的加熱時間不能太短，要把冷膠熱透，冷膠和燈槽之間的附著力就會大大降低。
Note 4: the heating time should not be too short. Heat the cold glue thoroughly, and the adhesion between the cold glue and the lamp slot will be greatly reduced.
注意事項五：
汽車車燈冷膠機廠家認為拆冷膠的大燈沒有什么特別的工具，主要靠的是耐心和細心。
Note 5: the manufacturer of automobile lamp glue cooler thinks that there is no special tool for removing the headlamp glue cooler, which mainly depends on patience and care.
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