Due to the low strength and elastic modulus of plastic itself, there is no adhesion between plastic and cement slurry and concrete, so there is an objective weak layer along the bellows interface in the structure. For structures with densely distributed linear prestressed beams at the same height... 了解更多
Due to the low strength and elastic modulus of plastic itself, there is no adhesion between plastic and cement slurry and concrete, so there is an objective weak layer along the bellows interface in the structure. For structures with densely distributed linear prestressed beams at the same height of... 了解更多
According to foreign standards, the material of plastic bellows is usually made of high-density polyethylene plastic (PE) and polypropylene plastic (PP). High-density polyethylene plastics are basically used in China. The difference between the two materials is that polypropylene plastic (PP) materi... 了解更多
There are two common plastics: one is polyethylene film; the other is polyvinyl chloride film. The plastic bag made of polyethylene film is non-toxic and can be used to hold food, but its strength is not good. And can not withstand high temperatures above 80 ℃, and has a certain permeability, not su... 了解更多
There are two types of plastic bellows, one is completely airtight and watertight, such as for propellant transportation of carrier rockets, gas, and water heaters; the other is continuous winding with tape, and ordinary bellows are used for Protect cables, such as magnetic card phones, machine tool... 了解更多
