Heat-insulating paper cup

Abstract

A heat-insulating paper cup allows the glued external wall of the heat-insulating tube to be formed with a smooth surface, and the raised lines on the inner wall of the heat-insulating tube are mated closely with the conical cylindrical wall of the cup body. This can facilitate advertisement printing and fabrication on the surface of heat-insulating paper cup. Moreover, the raised lines on the inner wall of the heat-insulating tube can support the ribs, thus enhancing the structural strength and robustness of the heat-insulating tube and avoiding squashing during manual holding.

1 . A heat-insulating paper cup, which comprising:
 a cup body, which consists of a conical cylindrical wall, a cup bottom and a cup rim; of which a downward protruding annular underframe is formed at the joint of the cup bottom and the bottom of the conical cylindrical wall;   a glued heat-insulating tube made of paper material; the inner wall of the heat-insulating tube is sleeved onto the exterior of the conical cylindrical wall of the cup body, and the heat-insulating tube and the conical cylindrical wall of the cup body are adhered securely by glue W; the heat-insulating tube is of conical cylindrical shape and mated with the conical cylindrical wall; moreover, the external wall of the heat-insulating tube is designed with a smooth surface;   multiple raised lines, protruded at interval onto the inner wall of the heat-insulating tube at an oblique angle, and mated with the conical cylindrical wall of the cup body;   multiple hollow ducts, set into the heat-insulating tube at interval and at an oblique angle in tune with the raised lines;   a second cup bottom, located at the bottom of annular underframe of the cup bottom, so that an interval space is formed between second cup bottom and cup bottom; and an annular side frame folded downwards is set on the periphery of the second cup bottom, and also located below the annular underframe of the cup bottom;   a bottom extension folded edge, extended downwards from the bottom of the heat-insulating sleeve; said bottom extension folded edge is also located beyond the annular underframe of the cup body and the annular side frame of the second cup bottom; and the lower end of bottom extension folded edge is folded inwards and upwards to form a folded flange, which is abutted to the inner side of annular side frame of the second cup bottom.   
     
     
         2 . The device defined in  claim 1 , wherein the heat-insulating tube is made of corrugated paper, so the corrugated inner layer of the corrugated paper is defined to form said raised line and hollow duct. 
     
     
         3 . The device defined in  claim 1 , wherein the raised lines are protruded at interval onto the inner wall of the heat-insulating tube at an oblique angle, and said hollow ducts are also designed with an oblique angle in tune with the raised lines. 
     
     
         4 . The device defined in  claim 3 , wherein said raised line is extended obliquely from the top to the bottom of the heat-insulating tube. 
     
     
         5 . The device defined in  claim 3 , wherein said raised line is extended transversely into a wavy pattern between the top and bottom of the heat-insulating tube. 
     
     
         6 . The device defined in  claim 1 , wherein a curved retracted segment is formed on the upper part of the annular side frame of the second cup bottom, and also abutted to the inner side of annular underframe of the cup body.