A doublewalled, throw-away, drinking cup having the outer sidewall extending from a rolled top edge down to the bottom edge of the cup on which the cup can stand. An inverted cup has walls extending around a recessed bottom surface. An inner side wall is secured to the outer sidewall and formed with a rolled top edge at the upper end and a bottom projection at the lower end which is hemmed up around the upstanding sidewall of the inverted cup so as to engage the recessed bottom surface. The outer sidewall has an outer sidewall extension at the lower end which is hemmed up about the bottom projection of the inner sidewall to engage the recessed bottom surface of the inverted cup. The rolled top edge of the cup has a diameter of 90 mm. which conforms to the size of typical drinking cup tops.

Insulated paper products are disclosed. Methods of making and using insulated paper products are also disclosed.

A container for retrievably storing substances and retaining temperatures of the substances comprises a container body comprising a neck portion and a body portion, and a container cover comprising cover openings. The body portion comprises interior walls and an exterior wall disposed around the interior walls. The interior walls form chambers within the body portion. The neck portion comprises openings in a base wall of the neck portion. The openings lead into the chambers. Each of the interior walls is thermally isolated from the interior walls and the exterior wall. The interior walls and the exterior wall thermally isolate a substance for retaining a temperature of the substance stored in each of the chambers. The cover openings couple with the openings based on coupling the container cover with the neck portion. The container cover allows an independent retrieval of the substances from the chambers through the cover openings.

The invention relates to a composite inner cup and double-layer cup manufacturing method. First, a metal cup body with a top convex ring is prefabricated. Then, a lower ring is placed in a mold, and the metal cup body is placed with the lower ring positioned at the bottom edge of the top convex ring. Next, an upper ring is placed on the inner side of the top convex ring. Then, upon closing the mold, the upper and lower rings are clamped. And then, injection processing is performed on the periphery of the top convex ring, so that the cup rim portion is injected and integrated with the upper and lower rings to cover the top convex ring to complete an inner cup. Finally, the outer cup and the cup rim portion of the inner cup can be combined by ultrasonic welding to form a composite double-layer cup.