Bio-degradable cup and method for making the same

Abstract

A bio-degradable cup includes a foam cup and a paper cup which is securely received in the foam cup. The paper cup includes a bio-degradable film coated to an inside thereof. The paper cup is formed by cutting a paperboard and folded to be the paper cup. The foam cup is made by preparing a foam board made by bio-degradable plastic which is treated by way of super-critical carbon dioxide extrusion, the foam board is cut into pieces and each piece is made to be the foam cup. The foam cup is applied with a heat treatment to obtain a sticky inner surface to which the paper cup is securely connected. A lip is formed around an outer top edge of the foam cup.

1 . A method for making a bio-degradable cup, comprising:
 a step of preparing a paperboard with a bio-degradable film coated on at least an inner or outer surface thereof, the paperboard then being cut, folded and heat-pressed to be a paper cup;   a step of preparing a foam board made by bio-degradable plastic which is treated by way of super-critical carbon dioxide extrusion, the foam board being cut into pieces and each piece being made to be a foam cup;   a step of applying a heat treatment to an inside of the foam cup to obtain a sticky inner surface of the foam cup and the paper cup being securely connected to the sticky inner surface of the foam cup, and   a step of making a lip around an outer top edge of the foam cup.   
     
     
         2 . The method as claimed in  claim 1  further comprising a step of connecting a foam pad to an underside of the foam cup and a diameter of the foam pad being the same as an outer diameter of the foam cup. 
     
     
         3 . The method as claimed in  claim 1 , wherein the bio-degradable film is made by Plolylactic Acid (PLA), Bio-Polymers, bio-degradable plastic or any plastic material suitable to be composted. 
     
     
         4 . The method as claimed in  claim 1 , wherein the bio-degradable plastic is one of Plolylactic Acid (PLA), Bio-Polymers, or bio-degradable plastic. 
     
     
         5 . The method as claimed in  claim 1 , wherein the non-bio-degradable plastic is one of Polyethylene (PE), Polypropylene, or Polyethylene Terephthalate (PET). 
     
     
         6 . The method as claimed in  claim 1 , wherein the lip on the foam cup is located beneath an outward and curved lip on the top edge of the paper cup. 
     
     
         7 . The method as claimed in  claim 1 , wherein the top edge of the foam cup is located at ½ to ⅓ height from the bottom of the paper cup. 
     
     
         8 . A bio-degradable cup comprising:
 a paper cup with a bio-degradable film coated to an inside thereof;   a foam cup in which the paper cup is received, the foam cup made by microfoam made by way of super-critical carbon dioxide extrusion, a lip connected to a top edge of the foam cup and a foam pad is connected to an underside of the foam cup.   
     
     
         9 . The method as claimed in  claim 8 , wherein the lip on the foam cup is located beneath an outward and curved lip on the top edge of the paper cup. 
     
     
         10 . The method as claimed in  claim 8 , wherein the top edge of the foam cup is located at ½ to ⅓ height from the bottom of the paper cup.