Patent Publication Number: US-10328892-B2

Title: Air bag packaging arrangement and self-adhesive checking valve thereof

Description:
CROSS REFERENCE OF RELATED APPLICATION 
     This is a Continuation application that claims the benefit of priority under 35U.S.C. § 119 to a non-provisional application, application Ser. No. 13/887,298, filed May 4, 2013, which is a Continuation application of a non-provisional application, application Ser. No. 13/887,297, filed May 4, 2013. 
    
    
     BACKGROUND OF THE PRESENT INVENTION 
     Field of Invention 
     The present invention relates to a packing product, and more particular to an air bag packaging arrangement and a self-adhesive checking valve therefor, wherein the air bag packaging arrangement comprises an air bag and an air valve for air-sealing the air bag after the air bag is inflated, and the self-adhesive checking valve has a backflow prevention channel adapted for self-adhesiving to prevent air leakage. 
     Description of Related Arts 
     Air cushioning product, such as “Bubble Wrap”, is excellent for packaging because it provides a cushioning effect but also water resistant for an item to be packed. However, the “bubble wrap” is too thin to provide enough cushioning effect for a relatively larger item. An improved air cushioning product is provided as an air bag having an air valve, wherein the air bag is inflated via the air valve to enhance the air cushioning effect. The air valve, such as check valve, stop valve, and safety valve, has a predetermined structure for preventing air leakage of the air bag. However, the air seal configuration of the air valve is complicated and cannot enduringly retain the air within the air bag. 
       FIG. 6  illustrates an air bag with a conventional air valve, wherein the air bag comprises two bag layers  1 ,  2  overlapped with each other to define an opening. The air valve comprises two valve layers  3 ,  4  overlappedly affixed between the bag layers  1 ,  2  at the opening so as to form a four-layered configuration. Accordingly, when the air bag is inflated, the valve layers  3 ,  4  are bonded to seal at the opening of the air bag so as to seal the air within the air bag. In particular, the first valve layer  3  is overlappedly bonded to the first bag layer  1  while the second valve layer  4  is overlappedly bonded to the second bag layer  2 . When inflating the air bag, air is guided to pass through a channel between the first and second valve layers  3 ,  4 . Once the air bag is inflated completely, the valve layers  3 ,  4  are bonded together to close and seal the opening of the air bag. In addition, the air pressure within the air bag will exert at the valve layers  3 ,  4  to ensure the valve layers  3 ,  4  being bonded together so as to prevent air being leaked through the air valve. In addition, the air valve is a one-way air valve only allowing air entering into the air bag. However, since the valve layers  3 ,  4  are self-adhered together to provide the sealing effect, the air will be gradually leaked through the channel after a period of use, especially when the air bag is compressed continuously. 
     SUMMARY OF THE PRESENT INVENTION 
     The invention is advantageous in that it provides an air bag packaging arrangement, wherein the air valve is a double non-return valve to provide double sealing effects of the air bag after the air bag is inflated. 
     Another advantage of the invention is to provide an air bag packaging arrangement, wherein the air inflating channel is sealed and closed by the two sealing films as the first sealing effect and is further sealed and closed by the check sealing film as the second sealing effect, so as to prevent any air leakage of the air bag. 
     Another advantage of the invention is to provide an air bag packaging arrangement, wherein in case of air leakage, the air is guided to flow to a backflow prevention channel for creating a supplemental air pressure to further seal and close the air inflating channel, so as to make up a deficient sealing effect of the sealing films. 
     Another advantage of the invention is to provide an air bag packaging arrangement, wherein the air leaked from the air chamber of the air bag will be filled into the backflow prevention channel to further seal and close the air inflating channel. Therefore, when the air pressure at the air chamber is reduced, the air pressure at the backflow prevention channel will be increased. In other words, the air pressure within the air bag will remain the same to provide the same air cushioning effect even the air chamber is leaked. Accordingly, the more the air leaked from the air chamber, the better the sealing effect of the check sealing film forms. 
     Another advantage of the invention is to provide an air bag packaging arrangement, which is adapted for incorporating with any pumping device to input the compressed air into the air bag via the air valve. 
     Another advantage of the invention is to provide an air bag packaging arrangement, which does not require altering the original structure of the air bag so as to reduce the manufacturing cost of the air bag with built-in air valve. 
     Another advantage of the invention is to provide an air bag packaging arrangement, wherein no expensive or mechanical structure is required to employ in the present invention in order to achieve the above mentioned objects. Therefore, the present invention successfully provides an economic and efficient solution not only for providing a double air-sealing configuration of the air bag but also for enhancing the practice use of the air bag. 
     Another advantage of the invention is to provide a self-adhesive checking valve which is adapted to be used in an air bag packaging arrangement, wherein the self-adhesive checking valve allows fluid such as air to flow therethrough and provides a backflow prevention channel for self-adhesion of the valve so as to prevent leakage of the fluid, so that life span of the air bag packaging arrangement can be prolonged. 
     Additional advantages and features of the invention will become apparent from the description which follows, and may be realized by means of the instrumentalities and combinations particular point out in the appended claims. 
     According to the present invention, the foregoing and other objects and advantages are attained by an air bag packaging arrangement which comprises an air bag and an air valve. 
     The air bag comprises at least one inflatable air cell, wherein the air cell comprises a first cell layer and a second cell layer overlapped with each other to form an air chamber and a valve opening communicating with the air chamber. 
     The air valve, which is a double non-return valve, comprises a first sealing film, a second sealing film, and a check sealing film. 
     The first and second sealing films are overlapped between the first and second cell layers of the air cell and extended from the valve opening of the air cell into the air chamber thereof. 
     The check sealing film is overlapped between proximal portions of the first and second sealing films to define an air inflating channel between the first sealing film and the check sealing film, and a backflow prevention channel between the check sealing film and the second sealing film, wherein the air inflating channel is arranged for inputting air into the air chamber to inflate the air cell until distal portions of the first and second sealing films are overlapped and sealed to close the air inflating channel by means of air pressure within the air chamber, wherein in case of air leakage between the distal portions of the first and second sealing films, the air within the air chamber is guided to flow to the backflow prevention channel for creating a supplemental air pressure to further seal and close the air inflating channel, so as to make up a deficient sealing effect of the first and second sealing films. 
     In accordance with another aspect of the invention, the present invention comprises a method of manufacturing an air bag, which comprises the steps of: 
     (a) making an air cell to have a first cell layer and a second cell layer overlapped with each other to form an air chamber and a valve opening; 
     (b) placing an air valve between the first and second cell layers to form an air inflating channel for communicating the valve opening with the air chamber, and to form a backflow prevention channel to communicate with the air chamber, wherein an inflating direction of the air inflating channel is opposite to an inputting direction of the backflow prevention channel; 
     (c) inputting air into the air chamber through the air inflating channel to inflate the air cell so as to seal and close the air inflating channel by means of air pressure within the air chamber; and 
     (d) in case of air leakage, guiding the air within the air chamber to flow to the backflow prevention channel for creating a supplemental air pressure to further seal and close the air inflating channel, so as to prevent the air being leaked from the valve opening. 
     Still further objects and advantages will become apparent from a consideration of the ensuing description and drawings. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an air bag packaging arrangement according to a preferred embodiment of the present invention. 
         FIG. 2  is a top view of the air valve of the air bag packaging arrangement according to the preferred embodiment of the present invention, illustrating the air bag at a deflated state. 
         FIG. 3  is a sectional view of the air valve of the air bag packaging arrangement according to the preferred embodiment of the present invention, illustrating the air cell being inflated. 
         FIG. 4A  is an enlarged sectional view of the air valve of the air bag packaging arrangement according to the preferred embodiment of the present invention, illustrating the air passing through the air inflating channel. 
         FIG. 4B  is an enlarged sectional view of the air valve of the air bag packaging arrangement according to the preferred embodiment of the present invention, illustrating the air leaked into the backflow prevention channel. 
         FIG. 5  is an enlarged sectional view of the air valve of the air bag packaging arrangement according to the preferred embodiment of the present invention, illustrating the two heat resisting substances. 
         FIG. 6  illustrates an air bag with a conventional air valve. 
         FIG. 7  is a sectional view of a self-adhesive valve according to a second preferred embodiment of the present invention. 
         FIG. 8  is an exploded view of the self-adhesive valve according to the above second preferred embodiment of the present invention. 
         FIG. 9  is an enlarged view of A-A in  FIG. 8 . 
         FIG. 10  is a perspective view of the self-adhesive valve according to the above second preferred embodiment of the present invention. 
         FIG. 11  is perspective view of an air bag packaging arrangement with the self-adhesive valve according to the above second preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 and 2 , an air bag packaging arrangement according to a preferred embodiment of the present invention is illustrated, wherein the air bag packaging arrangement is arranged for disposing at a packing area to surround a storage item so as to provide a cushioning effect for the item. Accordingly, the air bag packaging arrangement comprises an air bag  10  and an air valve  20 . 
     The air bag  10  comprises at least one inflatable air cell  11 , wherein the air cell  11  comprises a first cell layer  12  and a second cell layer  13  overlapped with each other to form an air chamber  14  and a valve opening  15  communicating with the air chamber  14 . As shown in  FIGS. 1 and 2 , two or more air cells  11  are constructed side-by-side to form the air bag  10 , wherein the air valve  20  is provided at each of the air cells  11 . In other words, each air cell  11  is an independent cell to be inflated. A sealing wall  101  is formed between two air cells  11 . It is appreciated that the air cells  11  are intercommunicating with each other that only one air valve  20  is required to inflate all the air cells  11 . In addition, the air bag  10  can be configured at any shape and size since the shape of each of the air cells  11  can be varied after inflation. 
     As shown in  FIG. 3 , the air valve  20  is a double non-return valve for providing double sealing effects for the air bag  10 , wherein the air valve  20  comprises a first sealing film  21 , a second sealing film  22 , and a check sealing film  23 . 
     The first and second sealing films  21 ,  22  are overlapped between the first and second cell layers  12 ,  13  of the air cell  11  and extended from the valve opening  15  of the air cell  11  into the air chamber  14  thereof. The first and second sealing films  21 ,  22  are two thin flexible sheets made of plastic being overlapped with each other, wherein the first and second sealing films  21 ,  22  are preferably two identical sheets. 
     Each of the first and second sealing films  21 ,  22  has a proximal edge extended from the valve opening  15  of the air cell  11  and a distal edge extended to the air chamber  14 . Preferably, the proximal and distal edges of the first and second sealing films  21 ,  22  are coterminous. 
     As shown in  FIG. 3 , the proximal edge of the first sealing film  21  is bonded with the first cell layer  12 . The proximal edge of the second sealing film  22  is bonded with the second cell layer  13 . 
     The check sealing film  23  is overlapped between the proximal portions of the first and second sealing films  21 ,  22  to define an air inflating channel  24  between the first sealing film  21  and the check sealing film  23 , and a backflow prevention channel  25  between the check sealing film  23  and the second sealing film  22 . 
     As shown in  FIG. 4A , the air inflating channel  24  is arranged for inputting air into the air chamber  14  to inflate the air cell  11  until distal portions of the first and second sealing films  21 ,  22  are overlapped and sealed to close the air inflating channel  24  by means of air pressure within the air chamber  14 . According to the preferred embodiment, in case of air leakage between the distal portions of the first and second sealing films  21 ,  22 , as shown in  FIG. 4B , the air within the air chamber  14  is guided to flow to the backflow prevention channel  25  for creating a supplemental air pressure to further seal and close the air inflating channel  24 , so as to make up a deficient sealing effect of the first and second sealing films  21 ,  22 . 
     As shown in  FIG. 3 , the air inflating channel  24  has two opened ends that one proximal opened end of the air inflating channel  24  is formed at the proximal edges of the first sealing film  21  and the check sealing film  23  to communicate with the valve opening  15  while another opposed distal opened end of the air inflating channel  24  is extended toward the distal edges of the first and second sealing films  21 ,  22  to communicate with the air chamber  14 . The compressed air can be inputted at the valve opening  15  to the air chamber  14  through the air inflating channel  24 . 
     It is worth mentioning that when the air cell  11  is inflated, the air pressure is retained within the air chamber  14  to apply the pressing force against the first and second sealing films  21 ,  22  therewithin, so as to seal the distal portions of the first and second sealing films  21 ,  22  and to close the distal opened end of the air inflating channel  24 . In addition, the distal portions of the first and second sealing films  21 ,  22  are sealed together by the surface tensions thereof. 
     The check sealing film  23  is a thin flexible sheet made of plastic. Preferably, the first and second sealing films  21 ,  22 , and the check sealing film  23  are polyethylene (PE) films. In addition, the thickness of each of the first and second cell layers  12 ,  13  is larger than the thickness of each of the first and second sealing films  21 ,  22 , and the check sealing film  23 . 
     According to the preferred embodiment, the length of the check sealing film  23  is shorter than the length of each of the first and second sealing films  21 ,  22 , such that when the check sealing film  23  is overlapped between the proximal portions of the first and second sealing films,  21 ,  22 , the distal portions of the first and second sealing films  21 ,  22  are overlapped with each other. It is worth mentioning that the length of the check sealing film  23  is the distance between the proximal and distal edges thereof. The length of each of the first and second sealing films  21 ,  22  is the distance between the proximal and distal edges thereof. 
     Accordingly, the proximal edges of the first and second sealing films  21 ,  22  and the check sealing film  23  are coterminous at the valve opening  15 . In addition, the proximal edge of the check sealing film  23  is bonded with the proximal edge of the second sealing film  22 . 
     As shown in  FIG. 3 , the backflow prevention channel  25  is formed between the check sealing film  23  and the second sealing film  22 , wherein the backflow prevention channel  25  has an opened end facing toward the air chamber  14  and a closed end facing toward the valve opening  15 . In other words, the proximal end of the backflow prevention channel  25  is the closed end while the distal end of the backflow prevention channel  25  is the opened end. 
     Accordingly, when the air is filled at the backflow prevention channel  25  at the open end thereof, the backflow prevention channel  25  is inflated for creating the supplemental air pressure to seal and close the air inflating channel  24  between the first sealing film  21  and the check sealing film  23 . 
     It is worth mentioning that when the air is input into the air chamber  15  through the air inflating channel  24 , the airflow direction of the air inflating channel  24  is opposite to the airflow direction of the backflow prevention channel  25 , as shown in  FIGS. 4A and 4B . Therefore, no air will be input to the backflow prevention channel  25 . When the air is leaked from the air chamber  15  back to the air inflating channel  24 , the air will fill into the backflow prevention channel  25  and to create the supplemental air pressure to seal and close the air inflating channel  24 , so as to prevent the air being leaked from the valve opening  15 . It is worth mentioning the leaked air will flow from the distal opened end of the air inflating channel  24  to the distal opened end of the backflow prevention channel  25  before exiting the proximal opened end of the air inflating channel  24 , so as to prevent the air being leaked to the valve opening  15 . In addition, the check sealing film  23  is sealed with the first sealing film  21  by the surface tensions thereof to seal and close the air inflating channel  24 . 
     In order to form the air valve  20  at the air cell  11 , the air valve  20  further comprises a first sealing seam  201  bonding the first cell layer  12  with the first sealing film  21  at the valve opening  15  of the air cell  11 , and a second sealing seam  202  bonding among the second cell layer  13 , the check sealing film  23 , and the second sealing film  22  together at the valve opening  15  of the air cell  11 . 
     Accordingly, the proximal edge of the first sealing film  21  is bonded with the first cell layer  12  via the first sealing seam  201 . The second cell layer  13  is bonded with the proximal edge of the second sealing film  22  and the proximal edge of the check sealing film  23  via the second sealing seam  202 . Preferably, two spaced apart first sealing seams  201  are formed to bond the first cell layer  12  with the first sealing film  21  while two spaced apart second sealing seams  202  are formed to among the second cell layer  13 , the check sealing film  23 , and the second sealing film  22  together. It is worth mentioning the first and second sealing seams  201 ,  202  are heat sealed seams, such as heat sealed lines and crescent-shaped heat sealed blocks. In other words, the proximal edge of the first sealing film  21  is heat-sealed with the first cell layer  12  via the first sealing seam  201  by heat sealing. The second cell layer  13  is heat-sealed with the proximal edge of the second sealing film  22  and the proximal edge of the check sealing film  23  via the second sealing seam  202  by heat sealing. 
     As shown in  FIG. 5 , in order to keep an open formation between the first sealing film  21  and the check sealing film  23  after the heat sealing process, the air valve  20  further comprises a first heat resisting substance  26  formed between the first sealing film  21  and the check sealing film  21  for ensuring the air inflating channel  24  between formed therebetween. The first heat resisting substance  26  is provided to prevent the first sealing film  21  and the check sealing film  21  being bonded together after the heat sealing process. 
     In particular, the first heat resisting substance  26  is provided between the proximal edge portions of the first sealing film  21  and the check sealing film  23  at the valve opening  15  of the air cell  11 , so as to ensure the proximal end of the air inflating channel  24  being opened. 
     Likewise, in order to ensure the open formation between the check sealing film  23  and the second sealing film  22 , the air valve  20  further comprises a second heat resisting substance  27  formed between the check sealing film  23  and the second sealing film  22  for ensuring the backflow prevention channel  25  formed therebetween. 
     In particular, the second heat resisting substance  27  is provided between the distal edge portions of the check sealing film  23  and the second sealing film  22  to ensure the distal end of the backflow prevention channel  25  being opened. It is worth mentioning that the proximal end of the backflow prevention channel  25  is closed by the second sealing seam  202 . 
     According to the preferred embodiment, the first and second heat resisting substances  26 ,  27  are two heat resisting coatings coated at the respective films at a predetermined location to prevent the films being bonded together during heat sealing process. As shown in  FIG. 5 , the first heat resisting substance  26  is extended from the proximal end of the check sealing film  23  at one side facing to the first sealing film  21 . The second heat resisting substance  27  is extended from the distal end of the check sealing film at an opposed side facing to the second sealing film  22 , wherein the second heat resisting substance  27  is not provide at the proximal portion of the check sealing film  23  at the opposed side thereof, such that the proximal end of the backflow prevention channel  25  can be closed by the second sealing seam  202 . It is worth mentioning that the second heat resisting substance  27  not only prevents the check sealing film  23  being bonded to the second sealing film  22  to ensure the distal end of the backflow prevention channel  25  being opened but also enhances the check sealing film  23  being coupled to the first sealing film  21  by surface tension to close the air inflating channel  24 . 
     The air valve  20  further comprises two lateral sealing seams  203  as two third sealing seams bonding the first sealing film  21  with the check sealing film  23  to form sidewalls of the air inflating channel  24 . The width of the air inflating channel  24  is defined between the two lateral sealing seams  203 . In particular, the two lateral sealing seams  203  are two slanted heat sealed seams that the width of the air inflating channel  24  is gradually reducing from the valve opening  15  toward the air chamber  14 . In other words, the proximal opened end of the air inflating channel  24  is an enlarged opened end to communicate with the valve opening  15  while the distal opened end of the air inflating channel  24  is a tapered opened end to communicate with the air chamber  14 . The tapered air inflating channel  24  will further prevent the air being leaked from the air chamber  14  to the valve opening  15 . 
     Preferably, the lateral sealing seams  203  are extended from the proximal edges of the first and second sealing films  21 ,  22  toward the distal edges thereof. Therefore, the lateral sealing seams  203  at the proximal portions of the first and second sealing films  21 ,  22  will bond with the check sealing film  23 . The lateral sealing seams  203  at the distal portions of the first and second sealing films  21 ,  22  will bond the first and second sealing films  21 ,  22  together. 
     The air valve  20  further comprises an air blocker  28  provided at the distal portions of the first and second sealing films  21 ,  22  to block the air in the air chamber  14  being directly flowed back to the air inflating channel  24 . Accordingly, the air blocker  28  is aligned with the distal opened end of the air inflating channel  24 . The air blocker  28  is formed as a heat sealed seam to heat-bond portions of the first and second sealing films  21 ,  22 , wherein the air blocker  28  has a non-flat blocking surface, such as convex surface or V-shaped surface, aligned with the distal opened end of the air inflating channel  24 . 
     Accordingly, in order to inflate the air cell  11 , a probe of the pumping device is inserted into the valve opening  15  to input the compress air into the air inflating channel  24 , wherein the air is input at the inflating direction from the proximal opened end of the air inflating channel  24  to the distal opened end thereof, i.e. from the valve opening  15  to the air chamber  14 . The air cell  11  will start to be inflated. The air pressure within the air chamber  14  will increase to pop the first and second cell layers  12 ,  13 . At the same time, the air pressure will also exert at the first and second sealing films  21 ,  22 , especially at the distal portions thereof. When the air cell  11  is completely inflated, i.e. the maximum inflation, the air pressure within the air chamber  14  will be strong enough to automatically seal the distal portions of the first and second sealing films  21 ,  22  and to automatically close the distal opened end of the air inflating channel  24 . The probe can be removed from the valve opening  15 . 
     When the distal portions of the first and second sealing films  21 ,  22  are not totally sealed together, the air within the air chamber  14  may leak to the air inflating channel  24 . In order to prevent the air being leaked to the air inflating channel  24 , the check sealing film  23  is sealed to the first sealing film  21  to close the distal opened end of the air inflating channel  24 . In particular, the inputting direction of the backflow prevention channel  25  is opposite to the inflating direction of the air inflating channel  24 . In addition, the opened end of the backflow prevention channel  25  is opened up when the distal opened end of the air inflating channel  24  is closed. Therefore, the air is filled to the backflow prevention channel  25  at the opened end thereof and is remained within the backflow prevention channel  25 . 
     The backflow prevention channel  25  is inflated by the air such that the supplemental air pressure within the backflow prevention channel  25  will be created to seal and close the air inflating channel  24 , especially the distal opened end of the air inflating channel  24 , between the first sealing film  21  and the check sealing film  23 . In particular, the greater the supplemental air pressure within the backflow prevention channel  25  is, the better the sealing effect of the check sealing film  23  forms. In other words, when air within the air chamber  14  is leaked to reduce the air pressure therewithin, the air is filled the backflow prevention channel  25  to increase the air pressure therewithin. Therefore, the total air pressure of the air cell, i.e. the sum of the air pressures within the air chamber  14  and the backflow prevention channel  25 , will remain the same. As a result, the air leaked from the air chamber  14  to the backflow prevention channel  25  will further enhance the sealing effect to seal and close the air inflating channel  24 . 
     It is worth mentioning that the air cell  10  can be inflated with air or other inert gas to provide particular functions such as heat resistant or fire protection. 
     In order to manufacturing the air bag  10 , the present invention further provides a manufacturing method which comprises the following steps. 
     (1) Overlap five sheets with each other, wherein the first and fifth sheets form the first and second cell layers  12 ,  13 , the second and third sheets form the first and second sealing films  21 ,  22 , and the third sheet forms the check sealing film  23 . According to the preferred embodiment, the air valve  20  of the present invention can incorporate with any air cell  11  having two cell layers  12 ,  13 . In other words, the step (1) can be rewritten as placing the air valve  20  between the first and second cell layers  12 ,  13 . 
     (2) Apply the first heat resisting substance  26  between the first sealing film  21  and the check sealing film  21 , and apply the second heat resisting substance  27  between the check sealing film  23  and the second sealing film  22 . 
     (3) Bond the proximal edge of the first sealing film  21  with the first cell layer  12  via the first sealing seam  201  by means of heat sealing. Then, bond the second cell layer  13  with the proximal edge of the second sealing film  22  and the proximal edge of the check sealing film  23  via the second sealing seam  202  by means of heat sealing. It is worth mentioning that the air inflating channel  24  is formed between the first sealing film  21  and the check sealing film  23  to communicate the valve opening  15  with the air chamber  14 . In addition, the backflow prevention channel  25  is also formed between the check sealing film  23  and the second sealing film  22  that the backflow prevention channel  25  has one opened end and an opposed closed end. 
     (4) Form the two lateral sealing seams  203  to bond the first sealing film  21  with the check sealing film  23  so as to form sidewalls of the air inflating channel  24 . 
     (5) Form the air blocker  28  provided at the distal portions of the first and second sealing films  21 ,  22 . 
     Referring to  FIG. 7  to  FIG. 11  of the drawings, a self-adhesive checking valve  10 A, which is adapted to be used in a fluid packaging arrangement, is illustrated. Fluid is filled into the fluid packaging arrangement through the self-adhesive checking valve  10 A and is prevented from leakage therethrough. Preferably, the self-adhesive checking valve  10 A is fittingly incorporated with an air bag packaging arrangement, wherein air is filled into the air bag packaging arrangement and is prevented from leakage therethrough, so that the cushioning effect of the air bag packaging arrangement is ensured. 
     According to this preferred embodiment, the air bag packaging arrangement comprises an air cushioning layer  1 A comprising a plurality of independent and parallel air cushioning cells  2 A and an air channel  3 A communicated with the air cushioning cells  2 A for inflating air into each of the air cushioning cells  2 A. The plurality of air cushioning cells  2 A is aligned to provide a receiving chamber  5 A for storing an item therein. Referring to  FIG. 7  of the drawings, a plurality of self-adhesive valves  10 A is used to inflate the air cushioning cells  2 A respectively through the air channel  3 A which is communicated with the air cushioning cells  2 A. 
     More specifically, the self-adhesive checking valve comprises a first valve film  11 A, a second valve film  12 A, and a third valve film  13 A. The first valve film  11 A and the third valve film  13 A are positioned at two sides of the second valve film  12 A respectively, that is the second valve film  12 A is positioned between the first valve film  11 A and the third valve film  12 A. The first valve film  11 A and the second valve film  12 A form an air inflating channel  14 A therebetween, while the second valve film  11 A and the third valve film  12 A form a backflow prevention channel  15 A therebetween. When air is filled into a receiving cavity  4 A through the air inflating channel  14 A, the inner surfaces of the first valve film  11 A, the second valve film  12 A and the third valve film  13 A are adhered with each other so that the air in the receiving cavity  4 A cannot flow out through the air inflating channel  14 A. Even though in case of leakage, the air will flow into the backflow prevention channel  15 A that creates a supplemental air pressure to apply on the second valve film  12 A to further seal and close the air inflating channel  14 A, so that the air is securely prevented from leaking through the air inflating channel  14 A. In this preferred embodiment, the receiving cavity  4 A is a storing space of each of the air cushioning cells  2 A. 
     In other words, the air flows from the air channel  3 A into the air inflating channel  14 A of the self-adhesive checking valve  10 A, so that each of the air cushioning cells of the air bag packaging arrangement can be filled with air. When each of the air cushioning cells is filled with air and a desired air pressure is obtained, the air inflating process is stopped. At that time, due to the properties of the three valve films  11 A,  12 A,  13 A, the first valve film  11 A, the second valve film  12 A and the third valve film  13 A are adhered with each other. Referring to  FIG. 7  to  FIG. 8  of the drawings, the air in each of the air cushioning cells does apply pressure onto the third valve film  13 A, so that the third valve film  13 A biases against the second valve film  12 A and the first valve film  11 A in such a manner that the three valve films  11 A,  12 A,  13 A are firmly attached to a wall of each of the air cushioning cells  2 A, so that the air cannot easily flow back into the air inflating channel  14 A through the three valve films  11 A,  12 A,  13 A. 
     It is worth mentioning that, the air inflating channel  14 A is defined between the first valve film  11 A and the second valve film  12 A. In other words, at an air inflating side  10  of the self-adhesive checking valve  10 A, the first valve film  11 A and the second valve film  12 A are not completely attached with each other, so that an air passage communicated with the receiving cavity  4 A is provided. However, the second valve film  12 A and the third valve film  13 A at the air inflating side  10  are sealed with each other. 
     According to the present embodiment, the self-adhesive checking valve has a first side  10   a , wherein, the first valve film  11 A and the second valve film  12 A are not sealed with each other at the first side  10   a . At another side of the self-adhesive checking valve  10 A, a second side  10   b  of the self-adhesive checking valve  10 A is provided, wherein the second valve film  12 A and the third valve film are not sealed with each other, so that a gap is formed therebetween so as to provide and define the backflow prevention channel  15 A. When air gets into the backflow prevention channel  15 A, because the second valve film  12 A and the third valve film are sealed with each other at the corresponding air inflating side  10 , the air cannot flow out. When the receiving cavity  4 A is filled with air, the air flows back into the backflow prevention channel  15 A and creates an air pressure to apply onto the second valve film  12 A, so that the second valve film  12 A is attached to the first valve film  11 A to further seal the air inflating channel  14 A, so that the air cannot easily flow out. 
     The first valve film  11 A, the second valve film  12 A, and the third valve film  13 A are made of flexible material, preferably polyethylene (PE). A first blocking layer  121 A is provided between the first valve film  11 A and the second valve film  12 A, so that when the self-adhesive checking valve undergoes a heat sealing process, the first valve film  11 A and the second valve film  12 A are not completely sealed with each other so as to form and define the air inflating channel  14 A therebetween. A second blocking layer  122 A is provided between the second valve film  11 A and the third valve film  12 A, wherein a length of the second blocking layer  122 A is smaller than a length of the second valve film  12 A, so that end portions of the second blocking layer  122 A are not aligned in an end-to-end manner with the second valve film  12 A and the third valve film  13 A at the air inflating side  10 , so that the second valve film  12 A and the third valve film  13 A at the inflating side  10  are completely sealed with each other for preventing air leakage. Accordingly, the first blocking layer  121 A and the second blocking layer  122 A are high temperature durable material, so that during the heat sealing process, the areas with the high temperature durable material are not heat sealed with each other, so that gaps are provided therebetween. In other words, more specifically, referring to  FIG. 8  to  FIG. 9  of the drawings, a first high temperature durable ink  121 A is printed between the first valve film  11 A and the second valve film  12 A, so that when the self-adhesive checking valve  10 A is undergoing the heat sealing process, the first valve film  11 A and the second valve film  12 A are not completely heat sealed with each other, but forming the air inflating channel  14 A instead. A second high temperature durable ink  122 A is printed between the second valve film  12 A and the third valve film  13 A, a length of the second high temperature durable ink  122 A is smaller than a length of the second valve film  12 A, so that the second high temperature durable ink  122 A is not aligned in an end-to-end manner with the second valve film  12 A and the third valve film  13 A at the air inflating side  10 , so that the second valve film  12 A and the third valve film  13 A of the self-adhesive checking film  10 A at the air inflating side  10  are sealed with each other to prevent air leakage. 
     In other words, when the air receiving cavity  4 A is filled with air, in case of air leakage, the air has to select choices between opening the first valve film  11 A and the second valve film  12 A, or opening the second valve film  12 A and the third valve film  13 A, so that backflow of the air is not easy. The air flows into the backflow prevention channel  15 A between the second valve film  12 A and the third valve film  13 A will further seal and close the air inflating channel  14 A, so that the air cannot flow out though the air inflating channel  14 A. Accordingly, the backflow prevention channel  15 A is not communicated with the air channel  3 A, so that the air is maintained to stay in the backflow prevention channel  15 A to further seal and close the air inflating channel  14 A. 
     Preferably, a length of the second valve film  12 A is smaller than the lengths of the first valve film  11 A and the third valve film. In this preferred embodiment, the first valve film  11 A and the third valve film  13 A have the same length, wherein the length of the second valve film  12 A is smaller than the length of the first valve film  11 A and the third valve film  13 A. A back flow channel  16 A is formed between the first valve film  11 A and the third valve film  13 A at the second side  10   b  of the self-adhesive checking valve  10 A, so that when the air is about to escape from the receiving cavity  4 A, the air has to enter into the backflow channel  16 A between the first valve film  11 A and the third valve film  13 A first, and then the air has to choose whether to enter into the air inflating channel  14 A between the first valve film  11 A and the second valve film  12 A or to enter into the backflow prevention channel  15 A between the second valve film  12 A and the third valve film  13 A. In other words, the air has to climb two stages before getting out, so that possibility and speed of backflow of the air is greatly decreased. Therefore, an increase of numbers of the valve films slows down the backflow speed, and even further, when the air flows into the backflow prevention channel  15 A between the second valve film  12 A and the third valve film  13 A, a supplemental air pressure is created to apply on the second valve film  12 A, so that the second valve film  12 A is more firmly and securely attached with the first valve film  11 A, so that air leakage is effectively prevented. 
     In other words, before flowing out, the air has to open and enter into the backflow channel  16 A between the first valve film  11 A and the third valve film  13 A, and then chooses to enter into the air inflating channel  14 A or the backflow prevention channel  15 A, so that the possibility of successfully getting out through the air inflating channel  15 A is rare. And, the air getting into the backflow prevention channel  15 A will further seal and close the air inflating channel  14 A for preventing a subsequent air leakage, so that the air can stay in the receiving cavity  4 A for a relatively long period of time. Accordingly, in this preferred embodiment, the air can stay in each of the air cushioning cells  2 A for a relatively long time, so that a good cushioning effect can be maintained for a long time too. 
     In another aspect of the prevent invention, the self-adhesive checking valve  10 A comprises two inflating valve films  11 A,  13 A and a checking film  12 A which is provided between the two inflating valve films  11 A,  13 A. One of the inflating valve films  11 A and the checking film  12 A form an air inflating channel  14 A therebetween, the other inflating film  13 A and the checking film  12 A form a backflow prevention channel  15 A therebetween. When air is inflated into the receiving cavity  4 A through the air inflating channel  14 A, the inner surfaces of two inflating valve films  11 A,  13 A and the checking film  12 A are adhered with each other, so that the air in the receiving cavity  4 A is not easy to flow back into the air inflating channel  14 A. And furthermore, in case of leakage, the air flows into the backflow prevention channel  15 A and creates a supplemental air pressure to apply on the checking film  12 A so as to further seal and close the air inflating channel  14 A, so that air leakage is prevented. 
     When the self-adhesive checking valve  10 A is incorporated in an air bag packaging arrangement, each of the air cushioning cells  2 A of the air bag packaging arrangement comprises a first sealing film  21 A and a second sealing film  22 A defining the receiving cavity  4 A. The self-adhesive checking valve  10 A is provided between the first sealing film  21 A and the second sealing film  22 A for filling air into the air cushioning cells and also preventing air leakage, so that cushioning effect of the air bag packaging arrangement is enhanced. 
     More specifically, at the first side  10   a  of the self-adhesive checking valve  10 A, i.e. the air inflating side, the first valve film  11 A is heat sealed with the first sealing film  21 A, and that the second valve film  12 A, the third valve film  13 A, and the second sealing film  22 A are heat sealed together, so that air from the air channel  3 A will flow into the receiving cavity  4 A through the air inflating channel  14 A between the first valve film  11 A and the second valve film  12 A. When the inflating process is stopped, inner surfaces of the first valve film  11 A, the second valve film  12 A and the third valve film  13 A are automatically attached with each other. As an example, the first valve film  11 A, the second valve film  12 A and the third valve film  13 A are attached to the first sealing film  21 A, so that it is not easy for the air in the receiving cavity  4 A to flow back into the air inflating channel  14 A. And, the air getting into the backflow prevention channel  15 A creates a supplemental air pressure to apply on the second valve film to further seal and close the air inflating channel  14 A. 
     Referring to  FIG. 10  to  FIG. 11  of the drawings, each of the air cushioning cells comprises a bonding line  23 A, wherein the first sealing film  21 A is overlapped with the second sealing film  22 A and bonded together along the bonding line  23 A so as to form the parallel air cushioning cells  21 A which are communicated with the air channel  3 A. 
     The air cushioning layer  1 A has at least two side portions  30 A which are connected one by one. Each of the air cushioning cells  2 A may further comprise at least two secondary air cushioning cells  20 A. Each of the secondary air cushioning cells  20 A of the air cushioning cell  2 A is communicated with an adjacent secondary cushioning cell  20 A. Accordingly, each of the secondary cushioning cells  20 A of the air cushioning cell  2 A forms a corresponding side portion  30 A. In other words, each of the side portions  30 A comprises at least a group of parallel secondary air cushioning cells  20 A of the air cushioning cells  2 A. 
     The air cushioning layer  1 A further comprises a plurality of air blocking members  24 A provided in each of the air cushioning cells  2 A adjacent to the air inflating channel  14 A for preventing air leakage. 
     Preferably, the air cushioning layer  1 A has 3˜8 side portions  30 A. The number of the secondary air cushioning cells  20 A of each of the air cushioning cells  2 A is not less than the number of the side portions  30 A. The secondary cushioning cells  20 A of the an air cushioning cell  2 A form the corresponding side portions  30 A respectively and are folded along area separating bonding lines to form a hollow structure defining the receiving chamber  5 A, 
     In addition, the air bag packaging arrangement may further comprise an outer layer for protecting the air cushioning layer  1 A, and a switch can be provided so that when the switch is opened, an item can be put into the receiving chamber  5 A of the air cushioning layer  1 A. 
     Accordingly, the self-adhesive checking valve  10 A provides a method for filling fluid in a fluid receiving cavity and preventing the fluid to flow out, wherein, preferably, the fluid is air. The method comprises the following steps: 
     (a) Filling air into a receiving cavity  4 A through an air inflating channel  14 A provided between a first valve film  11 A and a second valve film  12 A, wherein when the filling process is stopped, the first valve film  11 A and the second valve film  12 A are attached with each other because of the air pressure in the receiving cavity  4 A, so that the air inflating channel  14 A is closed; and 
     (b) Guiding the air in the receiving cavity  4 A into a backflow prevention channel  15 A provided between the second valve film  12 A and a third valve film  13 A so as to further seal and close the air inflating channel  14 A, so that air in the receiving cavity  4 A is not easy to flow out of the receiving cavity  4 A. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. It embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.