Aluminum alloy door and window seal
Due to the late development of the domestic plastic door and window sealing strip, the initial cross-sectional shape is relatively simple. It is limited to the "K" strip used for the glass bead seal, the large spoon used for the window frame (fan) seal, and the small "0" used by the yarn fan. "Articles, the variety is relatively simple. On the contrary, foreign sealing strips have been developed with plastic doors and windows, and their production has reached serialization and scale. The design of each product section conforms to the requirements of relevant functional functions, and the cooperation with the corresponding profiles is almost perfect.
In recent years, with the introduction of foreign door and window manufacturing technology, the cross-sectional shape and variety of domestic sealing strips have also undergone great changes, but due to the backwardness of the domestic mold making process and the domestic counterparts as a seal for one of the door and window accessories. The material is not attached enough, and finally the finished product is close to the shape of the design. There are still some defects in the function of use. For example, the gap between the parts is large, the amount of the finished product and the amount of overlap are not relevant. Requirements, etc., so that some quality problems will inevitably occur during use. In addition to the above factors, the occurrence of this phenomenon is more affected by the raw materials used, such as the processability and expansion ratio of the materials.
EPDM rubber is a sealing material with excellent comprehensive performance. It not only has excellent physical properties, but also has excellent processing properties and a small expansion coefficient. The sealing strip made of this material is almost different from the design requirements. Big, this is also an important reason for the rapid development of EPDM in recent years.
Sealing strip section design and mold making process status