Heat transfer is manifested in three ways in building heat exchange: conducted heat + convection heat <25%, radiant heat > 75%. After the temperature of the roof tile rises in summer, a large amount of radiant heat enters the room, causing the temperature to rise continuously, and the working and living environment is extremely uncomfortable. The solar radiation absorption coefficient (normal total radiation emissivity) of Dike aluminum foil coil is 0.07, and the amount of radiated heat is small. It is widely used for insulation of roof and wall. Thermal energy propagation route (without thermal insulation film): the sun - the infrared magnetic wave - the thermal energy hits the tile to raise the temperature - the tile becomes the heat source to emit heat - the thermal energy hits the cast-in-place roof to raise the temperature - cast The roof becomes a heat source to emit heat - the indoor environment temperature continues to rise Thermal energy propagation route (plus thermal insulation film): the sun - infrared magnetic wave - thermal energy hits the tile to raise the temperature - the tile becomes a heat source to emit heat - the thermal energy hits the aluminum foil to raise the surface temperature - the aluminum foil is extremely radioactive Low, emits a small amount of heat - the indoors maintain a comfortable ambient temperature. Plastic expansion tube referred to as expansion tube, and the expansion tube is called two kinds of products, one is oil expansion tube; One is plastic fastener, plastic expansion tube refers to a plastic fastener type of expansion tube, used for fastening the connection of objects, supporting the use of self-tapping screws. Plastic expansion screw,Plastic expansion Factory,Yellow Good Plastic expansion Hebei Qianmu Fastener Manufacturing Co., Ltd , https://www.qmjgjfasteners.com