How to make the cup radian in decal design

How to make the cup radian in decal design? The cup is made of a piece of cardboard with a strip with a diameter of two centimeters in the middle, so that some patterns can be designed, as shown in the figure below. This long bar in the middle of the cup is made of long tube, so that this arc can be made. The picture adds white foam to another part of the cup. It solves all the chemical components in the foam well, thus protecting everyone's health. However, many chemical components, such as thickener, antioxidant, bleaching agent, etc., should be added in the process of making this foam. These are non-renewable and renewable natural materials. In this way, the environmental protection effect can be shown on the outer packaging of beverages.