Patent ID: 8221844

Claim:
A method for manufacturing a wallpaper for use in an automobile, comprising the steps of: providing a wallpaper; providing a printing liquid having a foaming agent comprising constituent parts having a diameter of approximately 5 to 50 mm, each comprising a thermoplastic polymer layer having a thickness of approximately 2-15 mm forming a cavity having a hydrocarbon gas; printing the printing liquid onto the surface of the wallpaper, wherein the printing is carried out by using at least two print heads, wherein one print head prints on a first side of the wallpaper and a second print head prints on a second side of the wallpaper opposite to the first side of the wallpaper; applying heat to the printed surface of the wallpaper to cause the hydrocarbon gas of the foaming agent to expand so as to provide a three-dimensional appearance to the wallpaper by expanding the volume of the thermoplastic polymer layer by at least 30 times; and molding the wallpaper into an automobile part without crushing the three-dimensional appearance of the wallpaper.