Multi-layered packaging film, packaging bag, and package and packaging method using the multi-layered packaging film and the packaging bag

Abstract

A packaging bag includes at least two multi-layered sections adjacent with each other. Each of the at least two multi-layered sections includes an outer film, and an inner film layered inside the outer film to contact an object to be packaged. The outer film is movable with respect to the inner film, and has a coefficient of friction different from that of the inner film. The outer film is formed of a material having a small coefficient of friction, and the inner film is formed of a material having a large coefficient of friction.

1 . A packaging bag comprising:
 at least two multi-layered sections adjacent with each other, each of the at least two multi-layered sections comprising an outer film, and an inner film layered inside the outer film to contact an object to be packaged,   wherein the outer film is movable with respect to the inner film, and has a coefficient of friction different from that of the inner film.   
   
   
       2 . The packaging bag as claimed in  claim 1 , wherein the outer film is formed of a material having a smaller coefficient of friction that that of the inner film. 
   
   
       3 . The packaging bag as claimed in  claim 2 , wherein the outer film is formed of a high-density polyethylene (HDPE). 
   
   
       4 . The packaging bag as claimed in  claim 2 , wherein the inner film is formed of a low-density polyethylene (LDPE). 
   
   
       5 . The packaging bag as claimed in  claim 2 , wherein the inner film is formed in the shape of foam. 
   
   
       6 . The packaging bag as claimed in  claim 5 , wherein each of the at least two multi-layered sections further comprises a subsidiary film layered outside the inner film. 
   
   
       7 . The packaging bag as claimed in  claim 6 , wherein the subsidiary film is formed of a material having a coefficient of friction smaller than that of the inner film. 
   
   
       8 . The packaging bag as claimed in  claim 1 , wherein the object to be packaged has a surface polished at a high level. 
   
   
       9 . The packaging bag as claimed in  claim 1 , wherein the at least two multi-layered sections are joined with each other at one or more edges. 
   
   
       10 . The packaging bag as claimed in  claim 9 , wherein the at least two multi-layered sections are joined with each other at three edges thereof, and separated from each other at one edge thereof, thereby forming a pocket. 
   
   
       11 . A multi-layered packaging film comprising:
 an outer film; and   an inner film layered inside the outer film to contact an object to be packaged,   wherein the outer film is movable with respect to the inner film, and has a coefficient of friction different from that of the inner film.   
   
   
       12 . The multi-layered packaging film as claimed in  claim 11 , wherein the outer film is formed of a material having a smaller coefficient of friction than that of the inner film. 
   
   
       13 . The multi-layered packaging film as claimed in  claim 12 , wherein the outer film is formed of a high-density polyethylene (HDPE). 
   
   
       14 . The multi-layered packaging film as claimed in  claim 12 , wherein the inner film is formed of a low-density polyethylene (LDPE). 
   
   
       15 . The multi-layered packaging film as claimed in  claim 12 , wherein the inner film is formed in the shape of foam. 
   
   
       16 . The multi-layered packaging film as claimed in  claim 12 , further comprising a subsidiary film layered outside the inner film. 
   
   
       17 . The multi-layered packaging film as claimed in  claim 16 , wherein the subsidiary film is formed of a material having a coefficient of friction smaller than that of the inner film. 
   
   
       18 . The multi-layered packaging film as claimed in  claim 11 , wherein the inner and the outer films are joined with each other at one or more edges thereof. 
   
   
       19 . The multi-layered packaging film as claimed in  claim 11 , wherein the object to be packaged has a surface polished at a high level. 
   
   
       20 . A package comprising:
 a packaging material to package an object, comprising an inner film having a larger coefficient of friction than that of an outer film, the inner film being disposed to contact the object and the outer film being disposed outside the inner film and movable with respect to the inner film;   a cushion member provided outside the outer film; and   a packaging box to receive the cushion member,   wherein when the cushion member contacts the outer film and transmits an external impact thereto, a movement is generated in a largest scale between the inner film and the outer film.   
   
   
       21 . The package as claimed in  claim 20 , wherein the outer film is formed of a high density polyethylene (HDPE). 
   
   
       22 . The package as claimed in  claim 20 , wherein the inner film is formed of a low density polyethylene (LDPE). 
   
   
       23 . The package as claimed in  claim 20 , wherein the inner film is formed in the shape of a foam. 
   
   
       24 . The package as claimed in  claim 20 , wherein the packaging material further comprises a subsidiary film layered outside the inner film. 
   
   
       25 . The package as claimed in  claim 24 , wherein the subsidiary film is formed of a material having a coefficient of friction smaller than that of the inner film. 
   
   
       26 . The package as claimed in  claim 20 , wherein the object to be packaged has a surface polished at a high level. 
   
   
       27 . A packaging method comprising:
 packaging an object with a packaging material comprising an inner film having a larger coefficient of friction than that of an outer film, in such a manner that the inner film is disposed to contact the object and the outer film is disposed outside the inner film and movable with respect to the inner film;   providing a cushion member outside the outer film; and   inserting the packaged object together with the cushion member into a packaging box.   
   
   
       28 . The packaging method as claimed in  claim 27 , wherein the outer film is formed of a high-density polyethylene (HDPE), and the inner film is formed of a low-density polyethylene (LDPE). 
   
   
       29 . The packaging method as claimed in  claim 28 , wherein the inner film is formed in the shape of foam. 
   
   
       30 . The packaging method as claimed in  claim 28 , wherein the packaging material further comprises a subsidiary film layered outside the inner film. 
   
   
       31 . The packaging method as claimed in  claim 30 , wherein the subsidiary film is formed of a material having a coefficient of friction smaller than that of the inner film. 
   
   
       32 . A multi-layered packaging film as claimed in  claim 18 , wherein the inner film and the outer film are separated from each other except at the one or more edges.