當雙組份膠在混合過程中發生局部固化時，打膠機打出來的膠就會出現結皮或硫化現象。出現這一現象的原因主要有三種：
When the two-component rubber is partially solidified in the mixing process, the rubber produced by the rubber beater will be skinned or vulcanized. There are three main reasons for this phenomenon:
⑴膠體顏色較黑，固化快時，可能是由于B組分比例過高，過多的催化劑促使固化速度加快。此時，需要適當降低B組分的比例，將結皮或硫化膠沖洗干凈后施工；
⑴ The colloid color is dark, and the curing speed is fast, which may be due to the high proportion of component B, and excessive catalyst to accelerate the curing speed. At this time, it is necessary to reduce the proportion of component B appropriately, and wash the crust or vulcanizate before construction;

⑵打膠機若打膠過程中伴有出膠慢的現象時，可能是混合芯長時間未清洗或清洗不有效，膠體結皮堵塞管道。因此，定期清洗靜態混合器是很有必要的。
(2) If the glue dispensing process of the glue dispenser is accompanied by slow glue dispensing, it may be that the mixing core has not been cleaned for a long time or is not thoroughly cleaned, and the glue crust blocks the pipeline. Therefore, it is necessary to clean the static mixer regularly.
⑶當固化和出膠速度均無異常，而打出的膠仍有結皮或硫化現象時，則可能是設備停機時間較長，膠槍未清洗或洗槍不夠有效，需要將結皮或硫化膠沖洗干凈后后施工。
(3) When the curing and rubber discharging speed are normal, but the rubber still has skinning or vulcanization, it may be that the equipment has been shut down for a long time, the rubber gun has not been cleaned or the cleaning gun is not thorough enough, and it is necessary to clean the skinning or vulcanization rubber before construction.
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