Packaging clean film, packaging pouch, method of manufacturing the same and apparatus for carrying out the method

Abstract

Each of a pair of clean packaging films comprises a base structure consisting of a base layer and a heat-sealing layer, an outer protective film, and inner protective film. The pair of clean packaging films are superposed after the outer and the inner protective films are peeled off, and the superposed pair of packaging clean films are sealed properly to obtain pouches having clean inside and outside surfaces.

What is claimed is:  
     
         1 . A packaging clean film comprising: 
 a base structure having a heat-sealing layer forming an inside layer; and    protective layers laminated to the base structure so as to be able to be peeled off.    
     
     
         2 . The packaging clean film according to  claim 1 , wherein 
 the protective layers are laminated to the outside and the inside surface of the base structure, respectively.    
     
     
         3 . The packaging clean film according to  claim 2 , wherein 
 the outer protective layer laminated to the outer surface of the base structure is a multilayer film having component films.    
     
     
         4 . The packaging clean film according to  claim 1 , wherein 
 the protective is laminated to the inside surface of the base structure, and an antistatic layer is formed on the outside surface of the base structure.    
     
     
         5 . The packaging clean film according to  claim 4 , wherein 
 the antistatic layer is formed of a conductive ink.    
     
     
         6 . The packaging clean film according to  claim 1 , wherein 
 the protective layers are laminated to the outside and the inside surface of the base structure, and antistatic layers are formed between the base structure and the outer protective layer and on the outer protective layer, respectively.    
     
     
         7 . The packaging clean film according to  claim 6 , wherein 
 the antistatic layers are formed of a conductive ink.    
     
     
         8 . The packaging clean film according to  claim 1 , wherein 
 the protective layers are laminated to the outside and the inside surface of the base structure, the outer protective layer laminated to the outside surface of the base structure is a multilayer film having component films, and antistatic layers are formed on each component film of the outer protective layer, respectively.    
     
     
         9 . The packaging clean film according to  claim 8 , wherein 
 the antistatic layers are formed of a conductive ink.    
     
     
         10 . The packaging clean film according to  claim 1 , wherein 
 the heat-sealing layer contains an antistatic agent.    
     
     
         11 . A packaging clean film comprising: 
 a heat-resistant base structure;    a first melt-extruded film laminated to one surface of the heat-resistant base structure;    a second melt-extruded film laminated to the other surface of the heat-resistant base structure;    a first protective layer laminated to the first melt-extruded film; and    a second protective layer laminated to the second melt-extruded film.    
     
     
         12 . The packaging clean film according to  claim 11 , wherein 
 an anchor film is formed between the heat-resistant base structure and the first melt-extruded film or between the heat-resistant base structure and the second melt-extruded film, and the protective layer can be peeled off from the melt-extruded film corresponding to the anchor film.    
     
     
         13 . A packaging pouch manufactured by a packaging pouch manufacturing method comprising the steps of: 
 preparing a pair of packaging clean films each comprising a base structure having a heat-sealing layer forming an inside layer, and an inner protective layer laminated to the inside surface of the base structure so as to be able to be peeled off;    peeling off the inner protective layers of the packaging clean films to expose clean surfaces of the heat-sealing layers; and    superposing the pair of packaging clean films with the heat-sealing layers thereof facing to each other, and sealing peripheral portions of the superposed pair of packaging clean films to leave an open edge portion of the packaging pouch.    
     
     
         14 . The packaging pouch according to  claim 13 , wherein 
 the heat-sealing layer contains an antistatic agent.    
     
     
         15 . A packaging pouch manufactured by a packaging pouch manufacturing method comprising the steps of: 
 preparing a pair of packaging clean films each comprising a base structure having a heat-sealing layer forming an inside layer, an inner protective layer laminated to the inside surface of the base structure so as to be able to be peeled off, and an outer protective layer laminated to the outside surface of the base structure so as to be able to be removed;    peeling off the inner protective layers of the packaging clean films to expose clean surfaces of the heat-sealing layers; and    superposing the pair of packaging clean films with the heat-sealing layers thereof facing to each other, and sealing peripheral portions of the superposed pair of packaging clean films to leave an open edge portion of the packaging pouch.    
     
     
         16 . The packaging pouch according to  claim 15 , wherein 
 slits are formed in corners of sealed peripheral portions of the packaging pouch, each slit extends across the adjacent sealed peripheral portions of the packaging pouch in a depth from the protective layer of one of the packaging clean films to the interface between the base structure and the protective layer of the other packaging clean film.    
     
     
         17 . The packaging pouch according to  claim 15 , wherein 
 adhesive pull-tabs are attached adhesively to the protective films at corners of the sealed peripheral portions of the packaging pouch such that peripheral portions of the protective films are raised when the adhesive pull-tabs are pulled.    
     
     
         18 . A packaging pouch manufactured by a packaging pouch manufacturing method comprising the steps of: 
 preparing a pair of packaging clean films each comprising a base structure having a heat-sealing layer forming an inside layer, an inner protective layer formed on the inside surface of the base structure so as to be able to be peeled off, and an antistatic layer formed on the outside surface of the base structure;    peeling off the inner protective layers of the packaging clean films to expose clean surfaces of the heat-sealing layers; and    superposing the pair of packaging clean films with the heat-sealing layers thereof facing to each other, and sealing peripheral portions of the superposed pair of packaging clean films to leave an open edge portion of the packaging pouch.    
     
     
         19 . The packaging pouch according to  claim 18 , wherein 
 each of the packaging clean films further comprises an outer protective layer removably formed on the outside surface of the base structure, and an additional antistatic layer formed on the outer protective layer.    
     
     
         20 . The packaging pouch according to  claim 19 , wherein 
 the inner and the outer protective layers of each of the packaging clean films are peeled off simultaneously.    
     
     
         21 . The packaging pouch according to  claim 19 , wherein 
 the outer protective layers of the packaging clean films forming the packaging pouch are removed after putting articles in the packaging pouch and sealing the open edge portion of the packaging pouch.    
     
     
         22 . The packaging pouch according to  claim 18 , each of the packaging clean films further comprises an outer protective layer having a plurality of component films and removably formed on the outside surface of the base structure, and additional antistatic layers formed on the component films of the outer protective layer, respectively.  
     
     
         23 . A packaging clean film manufacturing method comprising the steps of: 
 arranging a first and a second protective films on an outside surface and an inside surface of a heat-resistant base structure; and    laminating the first and the second protective films to the outside and inside surfaces of the heat-resistant base surface, respectively, with molten resins extruded over the outside and inside surfaces of the heat-resistant base structure.    
     
     
         24 . The packaging clean film manufacturing method according to  claim 23 , further comprising: 
 a step of applying an anchor coat agent to one of the surfaces of the heat-resistant structure before laminating the first and the second protective films to the heat-resistant base structure.    
     
     
         25 . A packaging pouch manufacturing method for manufacturing a packaging pouch peripheral portions of which is sealed to leave an open edge, said method comprising the steps of: 
 preparing a pair of weblike packaging clean films each comprising a base structure having a heat-sealing layer forming an inside layer, and at least an inner protective film laminated to the inside surface of the base structure;    superposing the pair of weblike packaging clean films and feeding the superposed pair of packaging clean films into a clean atmosphere after peeling off the inner protective films of the pair of packaging clean films;    sealing the peripheral portions of the superposed pair of weblike packaging clean films along the traveling direction of the weblike packaging clean films and along the width direction thereof; and    cutting the sealed portion of the pair of weblike packaging clean film along the width direction.    
     
     
         26 . The packaging pouch manufacturing method according to  claim 25 , wherein 
 each of the pair of packaging clean films is further provided with an outer protective film formed on the outside surface of the base structure, and the outer protective films and the inner protective films are peeled off simultaneously.    
     
     
         27 . The packaging pouch manufacturing method according to  claim 25 , wherein 
 each of the pair of packaging clean films is further provided with an outer protective film formed on the outside surface of the base structure, and the method further comprises a step of sealing the open edge portion after putting articles through the open edge portion in the packaging pouch, and a step of peeling off the outer protective layers.    
     
     
         28 . A packaging pouch manufacturing apparatus comprising: 
 a clean chamber;    a pair of film feed units each storing a roll of a weblike packaging film having a base structure having a heat-sealing layer forming an inside layer, and at least an inner protective film laminated to the inside surface of the base structure;    a peeling unit disposed immediately before the clean chamber, for superposing the pair of weblike packaging clean films supplied from the pair of film feed units after peeling off the inner protective layers from the inside surfaces of the pair of weblike packaging clean films and sending the superposed pair of weblike packaging clean films into the clean chamber;    a sealing unit disposed in the cleaning chamber, for sealing peripheral portions of the pair of weblike packaging clean films along the traveling direction of the weblike packaging clean films and along the width direction thereof; and    a cutting unit disposed behind the sealing unit in the clean chamber for cutting the sealed portion of the pair of weblike packaging clean films along the width direction.    
     
     
         29 . The packaging pouch manufacturing apparatus according to  claim 28 , wherein each of the weblike packaging clean films further comprises an outer protective film laminated to the base structure, and the peeling unit peels off the outer protective films of packaging clean at the same time of peeling off the inner protective films.  
     
     
         30 . A sealed package comprising: 
 a clean packaging pouch manufactured by the steps of preparing a pair of packaging clean films each comprising a base structure having a heat-sealing layer forming an inside layer, and an inner protective layer removably formed on the inside surface of the base structure, removing the inner protective layers from the packaging clean films to expose the clean surface of the heat-sealing layer, and superposing the pair of packaging clean films with the heat-sealing layers thereof facing to each other and sealing peripheral portions of the superposed pair of packaging clean films; and    articles contained in the clean packaging pouch.    
     
     
         31 . The sealed package according to  claim 30 , wherein 
 the articles contained in the clean packaging pouch are a hard case, and silicon wafers contained in the hard case.    
     
     
         32 . The sealed package according to  claim 30 , wherein 
 the articles contained in the clean packaging pouch are dust-free garments    
     
     
         33 . The sealed package according to  claim 30 , wherein 
 the articles contained in the clean packaging pouch are clean filters.    
     
     
         34 . The sealed package according to  claim 30 , wherein 
 the articles contained in the clean packaging pouch are clean room supplies.    
     
     
         35 . The sealed package according to  claim 30 , wherein 
 the articles contained in the clean packaging pouch are pharmaceutical articles.    
     
     
         36 . The sealed package according to  claim 30 , wherein 
 the articles sealed in the clean packaging pouch are a hard disk case, and hard disk substrates contained in the hard disk case, the interior of the clean packaging pouch is evacuated so that the clean packaging pouch adheres closely to the hard disk case.    
     
     
         37 . The sealed package according to  claim 30 , wherein 
 each of the pair of packaging clean films further comprises an outer protective film formed on the outside surface of the base structure, and the outer protective films and the inner protective films are removed simultaneously.    
     
     
         38 . The sealed package according to  claim 36 , wherein 
 each of the pair of packaging clean films further comprises an outer protective film formed on the outside surface of the base structure, and the outer protective films are removed after sealing the articles in the clean packaging pouch.