1、接口設計與密封膠位移能力不匹配
1. Interface design does not match the sealant displacement capability.
人們經常發現密封膠使用在鋁板幕墻接口時，有發生開裂的現象，特別是在季節變換時，晝夜溫差特別大，溫度降低時板片收縮后對密封膠的過度拉伸造成。這主要是由于密封膠的位移能力達不到實際使用要求。
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、 密封膠選擇不當
2. Improper choice of sealant.
目前，市面上用于耐候防水的密封膠產品有很多：聚氨酯密封膠、聚硫密封膠和硅酮密封膠等。在工程案例上，很多人都沒有注意幾種密封膠的區別，而隨意選擇在鋁板幕墻上進行應用，經常出現密封膠表面龜裂、粉化的現象。
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、粘結不良
3. Poor bonding.

鋁板幕墻還經常出現的問題是密封膠與鋁板粘結不良。由于鋁板表面的處理方式有陽極氧化鋁、氟碳噴涂和粉末噴涂等，不同的處理方式和不同廠家的處理工藝均會對鋁板的表面結構及性能產生影響，從而對密封膠的粘結造成影響。
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、其他施工操作不當
4, other construction operations improper
為了避免鋁板單元在加工和運輸過程中出現劃傷現象，通常都會在其表面覆蓋一層PE保護膜。因此在鋁板安裝之后，需要對PE保護膜進行清理，然后才能施膠。
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、密封膠條表面鼓起
5. The surface of the sealant is plucked up.
鋁板的熱膨脹系數較大，當溫差較大時，鋁板的熱脹冷縮容易導致未固化完全的密封膠表面出現起鼓現象，特別是橫向接縫。起鼓現象發生時由于密封膠內部是實心的，不會對密封效果造成影響，主要是針對這種現象，可采取分兩次施膠的解決辦法，或者是在環境溫度較為恒定的時段進行施膠作業。
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.
本文由鋁卷生產廠家進行編寫，想要了解更多的產品及更詳細的精彩內容，請關注我們的官方網站：http://www.cettools.cn。
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.cettools.cn.