The present application relates to the technical field of composite aerogel panels, and specifically discloses a composite aerogel panel of an aluminum alloy honeycomb panel with decorative and thermal insulation effects and a preparation method thereof. The composite aerogel panel provided in the present application, includes the following layers from inside to outside: an aerogel thermal insulation coating layer, a first aluminum alloy plate layer, a first polypropylene hot-melt film layer, an aluminum alloy honeycomb core layer, a second polypropylene hot-melt film layer, a second aluminum alloy plate layer, a third polypropylene hot-melt film layer, and a polypropylene decorative film layer. The composite aerogel panel of the aluminum alloy honeycomb panel of the present application integrates the effects of thermal insulation, hydrophobicity, decoration, and mechanical properties.

A composite article can comprise a composite body including an organic polymer and ceramic particles comprising hexagonal boron nitride (hBN) particles distributed throughout the organic polymer, wherein an amount of the hBN particles ranges from 40 vol % to 90 vol % based on a total volume of the body; and the body comprises an in plane thermal conductivity of at least 15 W/mK. The hBN particles within the composite body can have a March-Dollase Orientation parameter of at least 50%.

A stretching unit for stretching a film is disclosed having an oven and a compensation device. The compensation device includes an air conveyor, the first compensation opening and a second compensation opening, in which the first compensation opening and the second compensation opening open into the oven on opposing sides of a central plane (M) of the oven in the vertical and drawing directions (H, R). The air conveyor is located in terms of flow between the first compensation opening and the second compensation opening, in which the compensation device is configured to remove a volume of air from the oven through one of the compensation openings and to feed the removed volume of air into the oven through the other one of the compensation openings.

A composite article can comprise a composite body including an organic polymer and ceramic particles comprising hexagonal boron nitride (hBN) particles distributed throughout the organic polymer, wherein an amount of the hBN particles ranges from 20 vol % to 40 vol % based on a total volume of the body; and the body comprises an in plane thermal conductivity of at least 10 W/mK. The hBN particles within the composite body can have a March-Dollase Orientation parameter of at least 50%.

The embodiments provide a polyamide-imide-based film, which comprises a polyamide-imide-based polymer, wherein when the coefficients of thermal expansion in the MD direction and TD direction of the film are measured at an interval of 5 C. in a temperature range of 300 C. to 365 C., respectively, the temperature at which the coefficient of thermal expansion in the MD direction or the coefficient of thermal expansion in the TD direction changes from a positive value to a negative value is 330 C. to 345 C., a process for preparing the same, and a cover window and a display device comprising the same.

A welded film including, at least a first thermoplastic resin film, a second thermoplastic resin film, and a thermoplastic resin film for connection disposed so as to span between the first thermoplastic resin film and the second thermoplastic resin film, wherein the first thermoplastic resin film and the thermoplastic resin film for connection are welded at a first welded portion, and the second thermoplastic resin film and the thermoplastic resin film for connection are welded at a second welded portion, and the welded portions are separated by 2.0 mm or more, or each of the welded portions is separated from an end portion of the corresponding thermoplastic resin film among the two thermoplastic resin films; and a method of producing the welded film.