Portion capsule for preparing a brewed product and a method for producing said portion capsule

A method for manufacturing a portion capsule, which is filled with an extraction material and which is for creating a brewed product, comprising the steps of:

• providing a main body of a plastic, with a bottom region, a peripheral side wall, and a peripheral main-body collar connecting to the peripheral side wall, wherein the main body has a rectangular cross section in a region of the main-body collar;
• providing a cover of a plastic, wherein the cover, connecting to a peripheral cover collar, forms an outward arching, and wherein dimensions of the peripheral cover collar are matched to the main-body collar, said cover being manufactured by deep drawing and said cover collar having at least one groove that is peripheral and formed in an outer side of the cover collar, said cover comprising an energy director that focuses ultrasound energy during ultrasound welding;
• filling the main body with an extraction material;
• and
• placing the cover onto the main body, such that the cover collar lies on the main-body collar, and fastening the cover collar on the main-body collar by way of ultrasound welding.