Adhesive-free packaging structure

Abstract

An adhesive-free packaging structure includes a substrate, at least one foldable area, and at least one first connecting structure. The substrate includes a first end portion and a second end portion, and a material of the substrate includes a natural fiber. The foldable area is disposed on the substrate and includes at least one folding line. The first connecting structure is disposed on the substrate and includes a first connecting element and a second connecting element respectively disposed on the first end portion and the second end portion. When the substrate is bent along the foldable area, the first end portion and the second end portion approach each other and the first connecting element and the second connecting element are correspondingly assembled.

What is claimed is: 
     
         1 . An adhesive-free packaging structure, comprising:
 a substrate comprising a first end portion and a second end portion, wherein a material of the substrate comprises a natural fiber;   at least one foldable area disposed on the substrate and comprising at least one folding line; and   at least one first connecting structure disposed on the substrate and comprising a first connecting element and a second connecting element, wherein the first connecting element and the second connecting element are respectively disposed on the first end portion and the second end portion;   wherein, when the substrate is bent along the foldable area, the first end portion and the second end portion approach each other, so the first connecting element and the second connecting element are correspondingly assembled.   
     
     
         2 . The adhesive-free packaging structure of  claim 1 , wherein a connecting length of the first connecting structure is more than 50% of a length of the first end portion. 
     
     
         3 . The adhesive-free packaging structure of  claim 1 , wherein a connecting length of the first connecting structure is more than 80% of a length of the first end portion. 
     
     
         4 . The adhesive-free packaging structure of  claim 3 , wherein a weight percentage of the natural fiber in the substrate is greater than or equal to 50%. 
     
     
         5 . The adhesive-free packaging structure of  claim 1 , wherein the material of the substrate is a non-plastic material. 
     
     
         6 . The adhesive-free packaging structure of  claim 1 , wherein a thickness of the substrate is T, and the following condition is satisfied:
   50 μm≤T≤500 μm.
   
     
     
         7 . The adhesive-free packaging structure of  claim 1 , wherein the first connecting element is a slot, the second connecting element is an insertion member, and the second connecting element is correspondingly inserted to the first connecting element. 
     
     
         8 . The adhesive-free packaging structure of  claim 1 , wherein the substrate comprises a body, a first side board, a second side board, a third side board, and a fourth side board, and the first side board, the second side board, the third side board, and the fourth side board are respectively connected to four sides of the body;
 wherein the first end portion is disposed on one side of the first side board away from the body, and the second end portion is disposed on one side of the second side board away from the body.   
     
     
         9 . The adhesive-free packaging structure of  claim 8 , wherein:
 a number of the at least one foldable area is four, and the four foldable areas are respectively disposed between the body and the first side board, between the body and the second side board, between the body and the third side board, and between the body and the fourth side board; and   when the first side board, the second side board, the third side board, and the fourth side board are respectively bent along the four foldable areas toward the body, the first side board, the second side board, the third side board, and the fourth side board approach each other so as to form an accommodating space by folding the adhesive-free packaging structure.   
     
     
         10 . An adhesive-free packaging structure comprising:
 a substrate, comprising:
 a body having two body sides and comprising a first extending portion and a second extending portion, the first extending portion having a first end portion, and the second extending portion having a second end portion; and 
 two side boards respectively connected to the two body sides, wherein each of the two side boards comprises a first connecting side, a second connecting side, and an open connecting side, and the open connecting side of each of the two side boards is not connected to the two body sides; 
 wherein a material of the substrate comprises a natural fiber; 
   at least two foldable areas disposed on the substrate and respectively located between the two side boards and the body, wherein each of the two foldable areas comprises at least one folding line;   a first connecting structure disposed on the substrate and comprising a first connecting element and a second connecting element, wherein the first connecting element is connected to the open connecting side of one of the two side boards, and the second connecting element is connected to the open connecting side of another one of the two side boards; and   at least two second connecting structures disposed on the substrate, each of the at least two second connecting structures comprising at least one third connecting element and at least one fourth connecting element, wherein the at least one third connecting element of one of the at least two second connecting structures is disposed on the first end portion, the at least one fourth connecting element of the one of the at least two second connecting structures is connected to the first connecting side of one of the two side boards, the at least one third connecting element of another one of the at least two second connecting structures is disposed on the second end portion, and the at least one fourth connecting element of the another one of the at least two second connecting structures is connected to the second connecting side of the one of the two side boards;   wherein, when the two side boards are respectively bent along the at least two foldable areas, the open connecting side of the one of the two side boards and the open connecting side of the another one of the two side boards approach each other, so the first connecting element and the second connecting element are correspondingly assembled; and   wherein, when the two side boards are respectively bent along the at least two foldable areas, the first connecting side of the one of the two side boards and the first end portion approach each other, and the second connecting side of the one of the two side boards and the second end portion approach each other, so the two third connecting elements of the at least two second connecting structures are respectively and correspondingly assembled to the two fourth connecting elements of the at least two second connecting structures.   
     
     
         11 . The adhesive-free packaging structure of  claim 10 , wherein a connecting length of the first connecting structure is more than 50% of a length of the open connecting side of each of the two side boards. 
     
     
         12 . The adhesive-free packaging structure of  claim 10 , wherein a connecting length of each of the two second connecting structures is more than 50% of a length of the first end portion, the connecting length of each of the two second connecting structures is more than 50% of a length of the second end portion, the connecting length of each of the two second connecting structures is more than 50% of a length of the first connecting side of each of the two side boards, and the connecting length of each of the two second connecting structures is more than 50% of a length of the second connecting side of each of the two side boards. 
     
     
         13 . The adhesive-free packaging structure of  claim 10 , wherein a weight percentage of the natural fiber in the substrate is greater than or equal to 50%. 
     
     
         14 . The adhesive-free packaging structure of  claim 10 , wherein the material of the substrate is a non-plastic material. 
     
     
         15 . The adhesive-free packaging structure of  claim 10 , wherein a thickness of the substrate is T, and the following condition is satisfied:
   50 μm≤T≤500 μm.
   
     
     
         16 . The adhesive-free packaging structure of  claim 10 , wherein the first connecting element is a slot, the second connecting element is an insertion member, and the second connecting element is correspondingly inserted to the first connecting element. 
     
     
         17 . The adhesive-free packaging structure of  claim 10 , wherein each of the at least one third connecting element is a slot, each of the at least one fourth connecting element is an insertion member, and each of the at least one fourth connecting element is correspondingly inserted to one of the at least one third connecting element. 
     
     
         18 . The adhesive-free packaging structure of  claim 10 , wherein:
 each of the at least two second connecting structures comprises at least two fourth connecting elements, another one of the two fourth connecting elements of the one of the at least two second connecting structures is connected to the first connecting side of the another one of the two side boards, and another one of the two fourth connecting elements of the another one of the at least two connecting structures is connected to the second connecting side of the another one of the two side boards; and   when the two side boards are bent respectively along the two foldable areas, the first connecting side of the another one of the two side boards and the first end portion approach each other, and the second connecting side of the another one of the two side boards and the second end portion approach each other, so the two third connecting elements of the at least two second connecting structures are respectively correspondingly assembled to the two fourth connecting elements of each of the two second connecting structures.   
     
     
         19 . The adhesive-free packaging structure of  claim 18 , wherein a number of the at least one folding line of each of the two foldable areas is at least two. 
     
     
         20 . The adhesive-free packaging structure of  claim 10 , wherein the body is rectangular-shaped.