Patent Publication Number: US-10766668-B2

Title: Dried food fresh-keeping packaging bag structure

Description:
FIELD OF THE INVENTION 
     The present invention relates to a dried food fresh-keeping packaging bag structure. When in use, a pull portion is pulled outwardly to tear a first sealing film so that a filling chamber of a fresh-keeping exhaust valve is opened with ease. Then, the fresh-keeping exhaust valve performs a non-return exhaust action on the exterior of the packaging bag to exhaust most of the air in the packaging bag. At this time, a preservative in the fresh-keeping exhaust valve communicates with the interior of the packaging bag to dehumidify or deoxidize the air remaining in the packaging bag. This can reduce or avoid the deterioration of the dried food caused by the residual air and effectively prolong the shelf life of the dried food in the packaging bag. 
     BACKGROUND OF THE INVENTION 
     People have higher and higher requirements for the preservation of foods. Generally, in addition to freezing and refrigerating foods to inhibit bacterial growth, isolating air and moisture is also a way to avoid food deterioration. A conventional packaging bag is used for packaging dried foods. When the packaging bag is opened, there is no re-sealing structure. Another packaging bag is provided with a zipper for temporarily closing the mouth of the bag to prevent food from falling out or preventing cockroaches or other insects from entering the bag to contaminate the food. Because there is still a lot of air in the bag, the food (such as coffee, tea, etc.) in the bag may be deteriorated due to moisture. 
     Taiwan Utility Model Publication No. M564875, discloses a “Choke Valve for Packaging Bags”. A packaging bag is provided with a plurality of air outlets. A choke valve is attached to the inner side of the packaging bag, corresponding in position to the air outlets. The chamber of the choke valve is provided with a diaphragm that is confined by a plurality of stoppers for blocking a plurality of air holes on the bottom surface of the chamber. When the packaging bag is squeezed, the diaphragm is pushed up by the air from the air holes, and the air is exhausted through the air outlets. A pressure difference is formed inside and outside of the bag, so that the diaphragm is attached to the air holes to prevent outside air and moisture from entering the packaging bag. The above-mentioned conventional choke valve can exhaust the air in the bag to the outside by squeezing the bag and can prevent outside air from entering the bag to reduce the effect of air or moisture on the oxidative deterioration of the food. 
     By squeezing the packaging bag, most of the air in the packaging bag can be exhausted to the outside. However, a little air will be left in the bag. The little air still affects the deterioration or freshness of the food, and it is unable to ensure the safe shelf life of the food. 
     In view of this, the conventional dried food packaging bag needs to be improved, and its safety and convenience still need to be improved. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems and develop a dried food fresh-keeping packaging bag structure. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a dried food fresh-keeping packaging bag structure, comprising a packaging bag and a fresh-keeping exhaust valve disposed in the packaging bag. The packaging bag is provided with at least one air vent for an interior of the packaging bag to communicate with the outside. The fresh-keeping exhaust valve comprises a valve body, a valve plate, and a preservative. The valve body is provided with a partition to partition its internal space into a valve chamber and a filling chamber. The partition is formed with at least one through hole so that the valve chamber and the filling chamber communicate with each other through the through hole. The valve plate is disposed in the valve chamber. An outer peripheral edge of an open end of the valve chamber is provided with a flange extending radially outwardly. The flange is located inside the packaging bag, having a surface attached to an inner side surface of the packaging bag relative to the air vent so that the valve chamber communicates with the outside through the air vent. The preservative is disposed in the filling chamber. An inlet end of the filling chamber is provided with a first breathable film to confine the preservative within the filling chamber. An outer surface of the first breathable film is provided with a first sealing film. One end of the first sealing film extends to an outside of a mouth of the packaging bag to form a pull portion. 
     When the user wants to use the packaging bag for preserving a dried food, the pull portion is pulled outwardly toward the outside of the mouth of the packaging bag to tear the first sealing film from the outer surface the filling chamber so that the filling chamber is opened. Then, the dried food is placed into the packaging bag. After the mouth of the packaging bag is closed, when the outside of the packaging bag is squeezed, the air inside the packaging bag passes through the filling chamber, the preservative and the through hole to push away the valve plate, and then the air is exhausted to the outside from the air vent of the packaging bag. When the air vent is stopped to exhaust, the valve plate is returned to close the through hole, thereby preventing the outside air from returning to the interior of the packaging bag so as to provide a non-return effect. After the outside of the packaging bag is squeezed, the air, not exhausted, is remained in the packaging bag. By the preservative in the filling chamber being in communication with the interior of the packaging bag, the preservative is configured to dehumidify or deoxidize the air remaining in the packaging bag. This can reduce or avoid the deterioration of the dried food caused by the residual air and effectively prolong the shelf life of the dried food in the packaging bag. 
     Preferably, the pull portion is provided with a clip slit to form a clip piece through the clip slit. The pull portion is clipped to the mouth of the packaging bag through the clip piece, and the pull portion is held on the outside of the mouth of the packaging bag. 
     Preferably, a second breathable film is disposed one side of on the partition of the valve body relative to the through hole. 
     Preferably, the open end of the valve chamber of the valve body is provided with a second sealing film attached to the flange. A surface of the second sealing film is attached to the inner surface of the packaging bag. The second sealing film is provided with at least one perforation relative to the air vent of the packaging bag for the valve chamber to communicate with the air vent. 
     The dried food fresh-keeping packaging bag structure of the present invention has an innovative and unique design. First, the first sealing film is torn through the pull portion, and the filling chamber of the fresh-keeping exhaust valve is opened easily. The fresh-keeping exhaust valve performs a non-return exhaust action on the interior of the packaging bag to exhaust most of the air in the packaging bag. At this time, the preservative in the filling chamber is in communication with the interior of the packaging bag, the preservative is configured to dehumidify or deoxidize the air remaining in the packaging bag. This can reduce or avoid the deterioration of the dried food caused by the residual air and effectively prolong the shelf life of the dried food in the packaging bag. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a first perspective view of the present invention; 
         FIG. 2  is a second perspective view of the present invention; 
         FIG. 3  is an exploded view of the present invention; 
         FIG. 4  is a perspective view of the fresh-keeping exhaust valve of the present invention; 
         FIG. 5  is a cross-sectional view of the fresh-keeping exhaust valve of the present invention; 
         FIG. 6  is a cross-sectional view of the present invention; 
         FIG. 6A  is a partial enlarged view of circle A of  FIG. 6 ; 
         FIG. 6B  is a partial enlarged view of circle B of  FIG. 6 ; 
         FIG. 7  is a cross-sectional view of the present invention, showing that the pull portion is torn away from the valve body; 
         FIG. 7A  is a partial enlarged view of circle A of  FIG. 7 ; and 
         FIG. 8  is a cross-sectional view of the present invention, showing a dried food packed in the interior of the packaging bag. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings. 
     As shown in  FIG. 1  through  FIG. 3 , a dried food fresh-keeping packaging bag structure in accordance with a preferred embodiment of the present invention comprises a packaging bag  10  and a fresh-keeping exhaust valve  20  disposed in the packaging bag  10 . The packaging bag  10  is provided with at least one air vent  11  for the interior of the packaging bag  10  to communicate with the outside. The fresh-keeping exhaust valve  20  comprises a valve body  30 , a valve plate  50 , and a preservative  50 . The valve body  30  is provided with a partition  31  to partition its internal space into a valve chamber  33  and a filling chamber  35 . The partition  31  is formed with at least one through hole  311 , so that the valve chamber  33  and the filling chamber  35  communicate with each other through the through hole  311 . The valve plate  50  is disposed in the valve chamber  33 . An outer peripheral edge of an open end of the valve chamber  33  is provided with a flange  301  extending radially outwardly. The flange  301  is located inside the packaging bag  10 , having a surface attached to an inner side surface of the packaging bag  10  relative to the air vent  11 , so that the valve chamber  33  communicates with the outside through the air vent  11 . The preservative  60  is disposed in the filling chamber  23 . An inlet end of the filling chamber  35  is provided with a first breathable film  41  to confine the preservative  60  within the filling chamber  35 . The outer surface of the first breathable film  41  is provided with a first sealing film  43 . One end of the first sealing film  43  extends to the outside of a mouth of the packaging bag  10  to form a pull portion  431 . 
     Referring to  FIG. 3  and  FIG. 4 , the pull portion  431  is provided with a U-shaped or V-shaped clip slit  45  to form a clip piece  451  through the clip slit  45 . The pull portion  431  is clipped to the mouth of the packaging bag  10  through the clip piece  451 , and the pull portion  431  is held on the outside of the mouth of the packaging bag  10 . 
     In addition, as shown in  FIG. 5  and  FIG. 3 , a second breathable film  42  is disposed one side of on the partition  31  of the valve body  30  relative to the through hole  311 . The second breathable film  42  can prevent the preservative  60  in the filling chamber  35  from entering the valve chamber  33 , so that the valve plate  50  can be opened and closed normally. If the preservative  60  enters the valve chamber  33 , the valve plate  50  may not form an airtight effect at the end of the through hole  311  to prevent air from flowing back. 
     Furthermore, the open end of the valve chamber  33  of the valve body  30  is provided with a second sealing film  46  attached to the flange  301 . A surface of the second sealing film  46  is attached to the inner surface of the packaging bag  10 . The second sealing film  46  is provided with at least one perforation  461  relative to the air vent  11  of the packaging bag  10  for the valve chamber  33  to communicate with the air vent  11 . Before the fresh-keeping exhaust valve  20  is not installed inside the packaging bag  10 , the interior of the valve body  30  can be completely sealed by the second sealing film  46 . When the fresh-keeping exhaust valve  20  is to be installed, the perforation  461  is formed by punching. When the fresh-keeping exhaust valve  20  is mass-produced, it is advantageously stored for use. 
     Referring to  FIG. 6  to  FIG. 6B  and  FIG. 5 , one end of the first sealing film  43  is provided with a bent portion  432  that is bent by 180 degrees and extends to the outside of the mouth of the packaging bag  10  to form the pull portion  431 . The bent portion  432  is bent reversely from the inner edge of the first sealing film  43  toward the mouth of the packaging bag  10 . 
     In detail, referring to  FIG. 7  and  FIG. 8  in conjunction with  FIG. 5 , when the user wants to use the packaging bag  10  for preserving a dried food, the pull portion  431  is pulled outwardly toward the outside of the mouth of the packaging bag  10  to tear the first sealing film  43  from the outer surface the filling chamber  35  so that the filling chamber  35  is opened. Then, the dried food is placed into the packaging bag  10 . After the mouth of the packaging bag  10  is closed, when the outside of the packaging bag  10  is squeezed, the air inside the packaging bag  10  passes through the filling chamber  35 , the preservative  60  and the through hole  311  to push the valve plate  50  away, and then the air is exhausted to the outside from the air vent  11  of the packaging bag  10 . When the air vent  11  is stopped to exhaust, the valve plate  50  is returned to close the through hole  311 , thereby preventing the outside air from returning to the interior of the packaging bag  10  so as to provide a non-return exhaust effect. After the outside of the packaging bag  10  is squeezed, the air, not exhausted, is remained in the packaging bag  10 . By the preservative  60  in the filling chamber  35  to communication with the interior of the packaging bag  10 , the preservative  60  can dehumidify or deoxidize the air remaining in the packaging bag  10 . This can reduce or avoid the deterioration of the dried food caused by the residual air and effectively prolong the shelf life of the dried food in the packaging bag  10 . 
     The packaging bag  10  may be changed according to actual needs. The packaging bag  10  is a zipper bag, or the packaging bag  10  is a heat seal bag sealed by a heat sealer. 
     Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.