Inflatable packaging bag

1. An inflatable packaging bag comprising a plurality of independent air bags separated one from another by way of heat sealing, said independent air bags being formed of a plurality of thin-sheet flexible layers, at least two edges of the flexible layers being laterally coterminous, the flexible layers including a top layer, a bottom layer, a top air-valve layer, and a bottom air-valve layer, each of said independent air bags having an air passage hole, an air inlet in communication with the air passage hole of each said independent air bag for input of compressed air to inflate said independent air bags, an air input port disposed away from the bottom layer and formed by two fourth top heat sealed seams spaced between two peripheral heat sealed seams to seal said top layer, said top air-valve layer and said bottom air-valve layer together, said bottom layer being disconnected from said two fourth top heat sealed seams, said peripheral heat sealed seams longitudinally disposed at two opposite lateral sides to seal the thin-sheet flexible layers of the respective independent air bag together, a narrow opening transversely extended between said peripheral heat sealed seams at a top side, first and second top heat sealed seams and a third top heat sealed seam connected between said peripheral heat sealed seams and extended along said opening at two sides, said first top heat sealed seam and said third top heat sealed seam sealing said top layer and said bottom layer together and defining with said peripheral heat sealed seams an air chamber, said second top heat sealed seam extending along one side of said narrow opening opposite to said third top heat sealed seam and sealing said top layer and said bottom layer together and defining with said first top heat sealed seam the air passage hole of the respective independent air bag, and storage items for protection from impact can be contained in the packing bag,

wherein each said independent air bag further comprises a skin of heat resisting substance provided between said top air-valve layer and said bottom air-valve layer to prevent complete bonding between said top air-valve layer and said bottom air-valve layer, and

wherein after inflation of said independent air bags, internal high pressure of each said independent air bag forces said top air-valve layer and said bottom air-valve layer toward said top layer to close the air input port of each said independent air bag.

2. The inflatable packaging bag as claimed in claim 1 , wherein the air passage holes of said independent air bags are disposed in communication with one another and connected to said air inlet.

3. The inflatable packaging bag as claimed in claim 1 , wherein each said independent air bag further comprises a first top folding line and a second top folding line formed in an upper part thereof formed and transversely extended near two distal ends, and a first bottom folding line and a second bottom folding line formed in a bottom pad thereof corresponding to said first top folding line and said second top folding line respectively.

4. The inflatable packaging bag as claimed in claim 1 , wherein the plurality of joined independent air bags defines a storage space for holding storage items under protection when inflated by compressed air applied into said air inlet.

5. The inflatable packaging bag as claimed in claim 1 , wherein when at least one said independent air bags is punctured, the remaining independent air bags are maintained in an airtight status to protect a storage item.

6. The inflatable packaging bag as claimed in claim 1 , wherein the air passage hole of each said independent air bag is used to close the opening of the respective independent air bag after inflation of said independent air bags.

7. The inflatable packaging bag as claimed in claim 1 , wherein the air passage hole of each said independent air bag is formed in a neck of the respective independent air bag.

8. The inflatable packaging bag as claimed in claim 1 , wherein the air passage hole of each said independent air bag is formed in a top side of the respective independent air bag.

9. The inflatable packaging bag as claimed in claim 1 , wherein the four thin-sheet flexible layers of each said independent air bag are made from plastics.

10. The inflatable packaging bag as claimed in claim 1 , wherein said independent air bags are inflated with an inert gas.

11. An inflatable packaging bag, comprising:

a top layer;

a top air-valve layer disposed below the top layer;

a bottom air-valve layer disposed below the top air-valve layer;

a bottom layer disposed below the bottom air-valve layer;

a plurality of first heat sealed seams connecting the top layer, the top air-valve layer, the bottom air-valve layer, and the bottom layer to form a plurality of independent air bags; and

an air input port formed by two second heat sealed seams connecting said top layer, said top air-valve layer and said bottom air-valve layer, said bottom layer being disconnected from said two second heat sealed seams.

12. The inflatable packaging bag as claimed in claim 11 , wherein after inflation of said independent air bags, internal high pressure of each said independent air bag forces said top air-valve layer and said bottom air-valve layer toward said top layer to close the air input port of each said independent air bag.