Disposable coated paper straw

Abstract

The invention provides a disposable coated paper straw formed by rolling one or more sheets. In the straw each one of the one or more sheets is a coated paper strip made of a coated paper which comprises a first paper-base layer and a first coating layer. The first coating layer is located at least at an exterior side of the first paper-base layer. The straw further contains an interface edge which is joined by overlapping portions of the one or more sheets in the longitudinal direction. The first coating layer is made from degradable resin. The straw provided by the present invention is not only degradable, which is environmentally friendly, but also it can maintain the strength of the straw over a long period of time.

What is claimed is: 
     
         1 . A disposable coated paper straw formed by rolling one or more sheets, the straw characterized in that:
 each one of the one or more sheets is a coated paper strip made of a coated paper which comprises a first paper-base layer and a first coating layer; the first coating layer located at least at an exterior side of the first paper-base layer;   the straw further comprising an interface edge which is joined by overlapping portions of the one or more sheets in the longitudinal direction;   wherein the first coating layer is made from degradable resin.   
     
     
         2 . The disposable coated paper straw of  claim 1 , characterized in that:
 the coated paper further comprises a second coating layer on an interior side of the first paper-base layer.   
     
     
         3 . The disposable coated paper straw of  claim 1 , characterized in that:
 the coated paper further comprises a second paper-base layer.   
     
     
         4 . The disposable coated paper straw of  claim 3 , characterized in that:
 the coated paper further comprises a second coating layer at an exterior side of the second paper-base layer.   
     
     
         5 . The disposable coated paper straw of  claim 1 , which is characterized in that:
 the first coating layer is made of a biodegradable coated resin.   
     
     
         6 . The disposable coated paper straw of  claim 1 , which is characterized in that: the end surface of the straw is a cut surface, and the first paper-base layer is exposed on the end surface. 
     
     
         7 . The disposable coated paper straw of  claim 1 , which is characterized in that: the coated paper comprises a printed pattern layer which is located on an exterior surface of the first coating layer or between the first coating layer and the first paper-based layer. 
     
     
         8 . The disposable coated paper straw of  claim 1 , which is characterized in that: the interface edge extends along a longitudinal axis of the straw. 
     
     
         9 . The disposable coated paper straw of  claim 1 , which is characterized in that: one end of the straw forms an angular portion or a spoon portion. 
     
     
         10 . The disposable coated paper straw according to  claim 9 , which is characterized in that: the spoon portion comprises one of the following:
 a straw end face and a spoon bevel connected to each other; or   a straw end face, a spoon step plane and a spoon step end face connected to each other.   
     
     
         11 . The disposable coated paper straw of  claim 1 , wherein the straw is formed by rolling a single said sheet; the straw further comprising two tubular portions. 
     
     
         12 . The disposable coated paper straw of  claim 11 , wherein the two tubular portions are separated from each other along a direction perpendicular to the longitudinal direction of the straw, but are connected by the interface edge. 
     
     
         13 . The disposable coated paper straw of  claim 1 , wherein the straw is formed by combining two said sheets which are otherwise separate from each other. 
     
     
         14 . The disposable coated paper straw of  claim 13 , wherein one of the two sheets is rolled to form an arc shape, and the other one of the two sheets is substantially flat. 
     
     
         15 . The disposable coated paper straw of  claim 13 , wherein both of the two sheets are rolled to form an arc shape respectively; the two arc shapes together forming a tubular portion of the straw. 
     
     
         16 . The disposable coated paper straw of  claim 13 , wherein each of the two sheets has a first portion that is rolled to form an arc shape, and a second portion which is substantially flat; the first portion of one of the two sheets corresponds to a second portion of the other one of the two sheets to form a tubular portion. 
     
     
         17 . The disposable coated paper straw of  claim 1 , wherein the straw is formed by rolling a single said sheet; the straw further comprises a tubular portion and a flat portion; the tubular portion located off-center along the direction of a line connecting the tubular portion and the flat portion. 
     
     
         18 . The disposable coated paper straw of  claim 1 , wherein the first coating layer is implemented on the exterior side of the first paper-base layer by printing. 
     
     
         19 . The disposable coated paper straw of  claim 18 , wherein the first coating layer is implemented on the exterior side of the first paper-base layer by flexographic printing.