The reason why the broken aluminum alloy doors and windows are called broken bridges is mainly disconnected by the black insulation strip in the middle. If there is no function of heat insulation strips, aluminum alloy doors and windows of broken bridges are ordinary aluminum alloy doors and windows. It can be seen that the role of heat insulation strips in the aluminum alloy doors and windows of broken bridges is very important, and it is referred to as the "heart" of broken aluminum profiles. The part is a veritable name.
What is the effect of insulation strips on aluminum alloy doors and windows in broken bridges?
The nature of the insulation strip determines its high strength and low conductivity. Otherwise, it will cause significant quality hazard to the insulated aluminum alloy doors and windows (insufficiency will cause the insulation aluminum profile to break from the joint of the insulation strip), or lose insulation. The effect (high conductivity can not guarantee the insulation effect), so the material selection and manufacturing process of the insulation strip is very important.
At present, there are two main types of insulation bars used for aluminum alloy doors and windows of broken bridges: PA66GF25 insulation strips, PVC insulation strips.
1, PA66GF25 insulation strip.
PA66 is a series of modified engineering plastic alloys with high melting point, excellent heat resistance and self-extinguishing properties. However, the unmodified PA66 material does not match the aluminum alloy in terms of tensile strength and coefficient of linear expansion. Through experiments, adding 25% of glass fiber to PA66 is converted into engineering plastic as the basic material of the thermal insulation strip. Best of all, there is no new material that is more reasonable and economical than this one.
2, PVC insulation strips.
The main raw material is PVC resin powder plus 25% calcium carbonate.
The national standard brand broken bridge aluminum profiles are basically made of PA66 nylon strips. Only some small workshops and miscellaneous broken bridge aluminum adopt PVC insulation strips.
How to identify PA66 insulation strips and PVC strips?
1. Look at the gloss.
The surface of the PA66GF25 insulation strip of the broken aluminum window is a matte texture, the color is anti-black; but the PVC insulation strip looks smooth, smooth, and the color is reversed. It is easier to distinguish between the two.
2, the degree of burning.
The PA66GF25 insulation strip is flammable and will continue to burn away from the source of ignition; the PVC insulation strip will burn for a while and will extinguish if left.
3, easy to break.
The PA66GF25 insulation strip is broken once or twice, and the PVC insulation strip needs to be broken more than ten times to break.
4, the degree of reduction.
When the PA66GF25 insulation strip is broken, the sound is crisp. After breaking, the fracture is neat and not deformed, and it can be docked and restored. After the PVC insulation strip is broken, the fracture is white and deformed.
Choose the aluminum alloy doors and windows of the broken bridge or find the door and window products of the regular door and window manufacturers and big brands, and use the domestic big brand broken bridge aluminum alloy doors and windows to ensure the quality and use more peace of mind. 
Editor in charge: Wang Zhen
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