1、接口设计与密封胶位移能力不匹配
1. Interface design does not match the sealant displacement capability.
人们经常发现密封胶使用在铝板幕墙接口时，有发生开裂的现象，特别是在季节变换时，昼夜温差特别大，温度降低时板片收缩后对密封胶的过度拉伸造成。这主要是由于密封胶的位移能力达不到实际使用要求。
It is often found that the sealant cracks when it is used at the interface of the aluminum curtain wall, especially during the seasonal change, the temperature difference between day and night is especially large, and the excessive stretching of the sealant is caused by the shrinkage of the plate when the temperature drops. This is mainly due to the displacement capacity of sealant can not meet the actual requirements.
2、 密封胶选择不当
2. Improper choice of sealant.
目前，市面上用于耐候防水的密封胶产品有很多：聚氨酯密封胶、聚硫密封胶和硅酮密封胶等。在工程案例上，很多人都没有注意几种密封胶的区别，而随意选择在铝板幕墙上进行应用，经常出现密封胶表面龟裂、粉化的现象。
At present, there are a lot of sealant products for weather and waterproof on the market: polyurethane sealant, polysulfide sealant and silicone sealant. In engineering cases, many people do not pay attention to the difference of several kinds of sealants, and arbitrarily choose to use in the aluminum curtain wall, often appear sealant surface cracking, pulverization phenomenon.
3、粘结不良
3. Poor bonding.

铝板幕墙还经常出现的问题是密封胶与铝板粘结不良。由于铝板表面的处理方式有阳极氧化铝、氟碳喷涂和粉末喷涂等，不同的处理方式和不同厂家的处理工艺均会对铝板的表面结构及性能产生影响，从而对密封胶的粘结造成影响。
The problem with aluminum curtain walls is the poor bonding between sealants and aluminum sheets. Because the surface treatment methods of aluminum plate include anodic alumina, fluorocarbon spraying and powder spraying, different treatment methods and different manufacturers'treatment processes will affect the surface structure and performance of aluminum plate, thus affecting the adhesion of sealant.
4、其他施工操作不当
4, other construction operations improper
为了避免铝板单元在加工和运输过程中出现划伤现象，通常都会在其表面覆盖一层PE保护膜。因此在铝板安装之后，需要对PE保护膜进行清理，然后才能施胶。
In order to avoid scratches in the process of processing and transportation, a PE protective film is usually coated on the surface of aluminum sheet units. Therefore, after the aluminum plate is installed, the PE protective film needs to be cleaned before sizing.
5、密封胶条表面鼓起
5. The surface of the sealant is plucked up.
铝板的热膨胀系数较大，当温差较大时，铝板的热胀冷缩容易导致未固化完全的密封胶表面出现起鼓现象，特别是横向接缝。起鼓现象发生时由于密封胶内部是实心的，不会对密封效果造成影响，主要是针对这种现象，可采取分两次施胶的解决办法，或者是在环境温度较为恒定的时段进行施胶作业。
The thermal expansion coefficient of aluminium sheet is large. When the temperature difference is large, the thermal expansion and cold shrinkage of aluminium sheet will easily lead to bulging on the surface of uncured sealant, especially on the transverse joints. Drum phenomenon occurs because the inside of the sealant is solid, will not affect the sealing effect, mainly for this phenomenon, can take two sizing solution, or in a relatively constant ambient temperature period of sizing operation.
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This article is written by the manufacturer of aluminium coil. To learn more about the products and more details, please pay attention to our official website: http://www.jndclyyxgs.com.