Air bag for bottle-shaped articles

Abstract

The utility model relates to the technical field of air column bags, in particular to an air bag for bottle-shaped articles. The packaging structure comprises a front surface film body and a back surface film body which are correspondingly arranged front and back, the front surface film body forms a front surface air cavity through a front surface outer film and a front surface inner film, the back surface film body forms a back surface air cavity through a back surface outer film and a back surface inner film, and M heat sealing lines are longitudinally arranged on the upper portion of the front surface air cavity to form a bottle opening wrapping area. N heat sealing lines are longitudinally arranged on the lower portion of the front air cavity to form a bottle body wrapping area, M heat sealing lines are longitudinally arranged on the upper portion of the back air cavity to form a bottle opening wrapping area, and N heat sealing lines are longitudinally arranged on the lower portion of the back air cavity to form a bottle body wrapping area. Different wrapping areas are formed on the surface of the film body through the heat sealing lines and tightly attached to and wrap the bottle opening, the bottle body and the bottle bottom of a bottle-shaped container respectively, so that bottle-shaped objects are prevented from being damaged due to shaking in the transportation process, and the safety of product transportation is improved.

Description

Technical Field

[0001] This utility model relates to the field of air column bag technology, and in particular to an airbag bag for bottle-shaped items. Background Technology

[0002] To protect products from impacts and shocks during transportation, air-filled shock-absorbing bags are commonly used. Current technology uses air-filled bags composed of several interconnected air columns, separated by heat-sealing lines. In practice, sometimes the air-filled bags need to be folded into a specific shape before being used to wrap the items for protection.

[0003] Bottle-shaped items, such as wine bottles and vases, have unique structures, with the mouth size being much smaller than the body size. When using existing air column bags to package bottle-shaped items, the air column bag can only fit snugly against the bottle body, leaving the mouth area unsupported. This causes the bottle to wobble during transportation and is easily damaged by external impacts. Utility Model Content

[0004] This application addresses the shortcomings of existing production technologies by providing an airbag for bottle-shaped items. Different wrapping areas are formed on the film surface by heat-sealing lines, which tightly wrap the bottle opening, body, and bottom of the bottle-shaped container, thereby preventing damage to the bottle-shaped items caused by shaking during transportation and improving the safety of product transportation.

[0005] The technical solution adopted in this utility model is as follows:

[0006] An airbag for bottle-shaped items includes a front film and a back film arranged opposite each other. The left and right sides of the front film and the left and right sides of the back film are sealed together by side heat-sealing lines. An opening is formed between the top edge of the front film and the top edge of the back film, forming a packaging space for accommodating the bottle-shaped item. The front film forms a front air cavity by a front outer film and a front inner film, and the back film forms a back air cavity by a back outer film and a back inner film. The front air cavity and the back air cavity are interconnected. The characteristic feature is that M heat-sealing lines are longitudinally arranged at the upper part of the front air cavity to form a bottle shape. The bottle body is enclosed by N heat-sealing lines arranged vertically at the lower part of the front air cavity, forming a bottle mouth enclosed area. Similarly, the bottle mouth enclosed area and the bottle body enclosed area are both connected. Furthermore, the bottom of the front air cavity and the bottom of the back air cavity are enclosed by multiple arc-shaped heat-sealing lines, forming a bottle bottom enclosed area.

[0007] Furthermore, the heat sealing line at the bottom of the front membrane body adopts at least one front secondary longitudinal heat sealing line and at least one front tertiary longitudinal heat sealing line. The front secondary longitudinal heat sealing line and the front tertiary longitudinal heat sealing line are alternately distributed along the width direction of the front membrane body, and the length of the front tertiary longitudinal heat sealing line is greater than the length of the front secondary longitudinal heat sealing line.

[0008] Furthermore, the heat sealing line at the bottom of the back film body adopts at least one secondary longitudinal heat sealing line and at least one tertiary longitudinal heat sealing line. The secondary and tertiary longitudinal heat sealing lines are alternately distributed along the width direction of the back film body, and the length of the tertiary longitudinal heat sealing line is greater than that of the secondary longitudinal heat sealing line.

[0009] Furthermore, the left and right sides of the front outer membrane and the left and right sides of the front inner membrane are sealed together by the front side heat sealing line, and the top edge of the front outer membrane and the top edge of the front inner membrane are sealed together by the front top edge heat sealing line.

[0010] Furthermore, a U-shaped tear-off section is provided on the front membrane body. The tear-off section is located at the intersection of the heat sealing line on the upper part of the front air cavity and the heat sealing line on the top edge of the front. The left and right sides of the tear-off section are separated from the main body of the front membrane body, while the lower part of the tear-off section is connected to the main body of the front membrane body as one unit.

[0011] Furthermore, the bottom edge of the back outer film and the bottom edge of the front outer film are connected as one piece, the bottom edge of the back inner film and the bottom edge of the front inner film are connected as one piece, and the left and right sides of the back outer film and the left and right sides of the back inner film are sealed and connected as one piece by the back side heat sealing line.

[0012] Furthermore, two valve membranes are provided between the outer back membrane and the inner back membrane. The top edges of the two valve membranes, the outer back membrane, and the inner back membrane are connected as one unit by a horizontally arranged air inlet heat sealing line. At least one heat-resistant layer is coated between the top edges of the two valve membranes by printing. The at least one heat-resistant layer is distributed along the width direction of the valve membrane. The heat-resistant layer spans the air inlet heat sealing line above and below, and the air inlet of the valve is formed at the position of the heat-resistant layer.

[0013] Furthermore, the top edge of the outer membrane on the back and the top edge of the inner membrane on the back are connected as one unit by a heat-sealing line on the horizontally set air intake channel. An air intake channel is formed between the heat-sealing line on the air intake channel and the heat-sealing line of the air inlet. One end of the air intake channel is an air inlet, and the other end of the air intake channel is sealed by a vertically set heat-sealing line on the side of the air intake channel. The upper and lower ends of the heat-sealing line on the side of the air intake channel are respectively connected to the heat-sealing line on the air intake channel and the heat-sealing line of the air inlet. The air intake channel is connected to the air inlet of the air valve.

[0014] Furthermore, a front transverse heat-sealing line is provided on the left and right sides of the bottom of the front membrane. The front transverse heat-sealing line extends along the width direction of the front membrane and extends laterally from the side of the front membrane to one end of the arc heat-sealing line located on the side. Similarly, a back transverse heat-sealing line is provided on the left and right sides of the bottom of the back membrane. The back transverse heat-sealing line extends along the width direction of the back membrane and extends laterally from the side of the back membrane to one end of the arc heat-sealing line located on the side.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention features heat-sealed lines forming different wrapping areas on the film surface, which tightly adhere to the bottle opening, body, and bottom of the bottle-shaped container, thereby preventing damage to the bottle-shaped item due to shaking during transportation and improving product transport safety. The invention also includes a tear-off section, allowing for easy tearing of the film covering the bottle-shaped item for convenient removal. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention.

[0018] Figure 2 This is a front view of the membrane structure of this utility model.

[0019] Figure 3 This is a structural diagram of the back membrane of this utility model.

[0020] Figure 4 This is a cross-sectional view of the front membrane structure of this utility model.

[0021] Figure 5 This is a cross-sectional structural diagram of the back membrane of this utility model.

[0022] Figure 6 A cross-sectional structural diagram showing the location of the air valve membrane on the back of the membrane body of this utility model.

[0023] Figure 7 This is a structural diagram of the air valve diaphragm of this utility model.

[0024] Among them: 100, front membrane body; 110, front outer membrane; 120, front inner membrane; 130, front primary longitudinal heat seal line; 140, front secondary longitudinal heat seal line; 141, front tertiary longitudinal heat seal line; 150, front arc heat seal line; 160, front transverse heat seal line; 170, front top edge heat seal line; 180, front side heat seal line; 190, tear-off section; 200, back membrane body; 210, back outer membrane; 2 20. Back inner membrane; 230. Back primary longitudinal heat seal line; 240. Back secondary longitudinal heat seal line; 241. Back tertiary longitudinal heat seal line; 250. Back arc heat seal line; 260. Back transverse heat seal line; 270. Intake channel upper heat seal line; 271. Intake channel side heat seal line; 280. Back side heat seal line; 290. Intake channel; 300. Valve membrane; 400. Heat-resistant layer; 500. Intake port heat seal line. Detailed Implementation

[0025] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, an airbag for bottle-shaped items includes a front film 100 and a back film 200 arranged opposite each other. An opening is formed between the top edges of the front film 100 and the back film 200, forming a packaging space for accommodating the bottle-shaped item. The left and right sides of the front film 100 and the back film 200 are sealed together by side heat-sealing lines. In use, the bottle-shaped item is inserted into the packaging space through the opening, and the front film 100 and the back film 200 inflate after being inflated, protecting the bottle-shaped item within the packaging space.

[0027] like Figure 4 and Figure 5 As shown, the front membrane 100 includes a front outer membrane 110 and a front inner membrane 120 arranged correspondingly front to back, and the front membrane 100 forms a front air cavity with the front outer membrane 110 and the front inner membrane 120. The back membrane 200 includes a back outer membrane 210 and a back inner membrane 220 arranged correspondingly front to back, and the back membrane 200 forms a back air cavity with the back outer membrane 210 and the back inner membrane 220. The back air cavity and the front air cavity are interconnected.

[0028] like Figure 1 and Figure 2As shown, the upper part of the front air cavity has M heat-sealing lines forming the bottle mouth area, and the lower part of the front air cavity has N heat-sealing lines forming the bottle body area. Similarly, the upper part of the back air cavity has M heat-sealing lines forming the bottle mouth area, and the lower part of the back air cavity has N heat-sealing lines forming the bottle body area, where N > M, N is a positive integer, and M is a natural number. The bottle mouth and bottle body areas of the front and back air cavities are interconnected. The bottom of the front and back air cavities has multiple arc-shaped heat-sealing lines forming a semi-circular bottle bottom area, and the bottom of the front and back air cavities also has multiple arc-shaped heat-sealing lines forming a semi-circular bottle bottom area. These bottom areas of the front and back air cavities are interconnected.

[0029] When wrapping bottle-shaped items, the upper parts of the front and back air chambers, when inflated, fit snugly against the bottle opening; the lower parts of the front and back air chambers, when inflated, fit snugly against the bottle body; and the bottom of the front and back air chambers, when inflated, fit snugly against the bottle bottom. The airbag, with heat-sealed lines on its membrane surface forming different wrapping areas, fits snugly against the bottle opening, body, and bottom, thus preventing damage to the bottle-shaped item due to shaking during transportation and improving product transport safety.

[0030] The number of heat-sealing lines M at the top of the front and back air cavities is less than the number of heat-sealing lines N at the bottom of the front and back air cavities. This results in the air volume of the air cavity formed by the upper heat-sealing line being greater than that of the air cavity formed by the lower heat-sealing line. The degree of inflation of the air cavity formed by the upper heat-sealing line is also greater than that of the air cavity formed by the lower heat-sealing line. This ensures that different diameter parts of the bottle-shaped item can be tightly wrapped by the air cavity.

[0031] like Figure 2 and Figure 4 As shown, the left and right sides of the front outer film 110 and the left and right sides of the front inner film 120 are sealed and connected as one piece by the front side heat sealing line 180. The top edge of the front outer film 110 and the top edge of the front inner film 120 are sealed and connected as one piece by the front top edge heat sealing line 170. The bottom edge of the front outer film 110 and the bottom edge of the front inner film 120 are separated from each other to form an opening.

[0032] like Figure 2As shown, the heat-sealing line on the upper part of the front membrane 100 is a primary longitudinal heat-sealing line 130, which extends from the top edge to the middle position along the length of the front membrane 100. The primary longitudinal heat-sealing line 130 divides the upper part of the front air chamber into two primary air chambers, which corresponds precisely to the mouth of the bottle-shaped item being wrapped. More or fewer primary longitudinal heat-sealing lines 130 can be provided along the front membrane 100 as needed.

[0033] like Figure 2 As shown, the heat-sealing lines at the lower part of the front film 100 consist of three secondary longitudinal heat-sealing lines 140 and two tertiary longitudinal heat-sealing lines 141. These lines are alternately distributed along the width of the front film 100. Both the secondary and tertiary longitudinal heat-sealing lines 140 and 141 extend along the length of the front film 100, with the tertiary heat-sealing line 141 having a greater length than the secondary heat-sealing line 140. The positions of the secondary and tertiary heat-sealing lines 140 and 141 correspond precisely to the body of the bottle-shaped item being wrapped, and the portion of the tertiary heat-sealing line 141 that is longer than the secondary heat-sealing line 140 corresponds precisely to the bottom side of the bottle-shaped item being wrapped. A portion of the front secondary longitudinal heat seal line 140 and the front tertiary longitudinal heat seal line 141 divides the middle part of the front membrane 100 into six front secondary air chambers, which corresponds precisely to the body of the bottle-shaped item being wrapped. Another portion of the front tertiary longitudinal heat seal line 141 divides the lower part of the front membrane 100 into three front tertiary air chambers, which corresponds precisely to the bottom side of the bottle-shaped item being wrapped. Depending on the needs, more or fewer front secondary longitudinal heat seal lines 140 and front tertiary longitudinal heat seal lines 141 can be provided along the front membrane 100 to divide it into different numbers of front secondary and tertiary air chambers.

[0034] like Figure 2 As shown, three arc-shaped heat-sealing lines 150 are provided at the bottom of the front membrane 100, spaced apart and forming a semi-circle. Front transverse heat-sealing lines 160 are provided on the left and right sides of the bottom of the front membrane 100, extending along the width of the front membrane 100. These lines extend laterally from the side of the front membrane 100 to one end of the side arc-shaped heat-sealing lines 150, guiding the incoming air. The arc-shaped heat-sealing lines 150 form a semi-circular bottom air cavity at the bottom of the front membrane 100, which corresponds precisely to the bottom of the bottle-shaped item being wrapped.

[0035] like Figure 2As shown, a U-shaped tear-off section 190 is provided on the front membrane 100. The tear-off section 190 is located at the intersection of the front first-level longitudinal heat-sealing line 130 and the front top edge heat-sealing line 170. The left and right sides of the tear-off section 190 are detached from the main body of the front membrane 100, and the lower side of the tear-off section 190 is connected to the main body of the front membrane 100 as one piece. People can easily tear open the front membrane 100 covering the bottle-shaped item by pulling down the tear-off section 190, thus making it convenient to take out the bottle-shaped item.

[0036] like Figure 3 and Figure 5 As shown, the bottom edge of the back outer film 210 and the bottom edge of the front outer film 110 are connected as one piece, and the bottom edge of the back inner film 220 and the bottom edge of the front inner film 120 are connected as one piece. The left and right sides of the back outer film 210 and the left and right sides of the back inner film 220 are sealed and connected as one piece by the back side heat sealing line 280.

[0037] like Figure 3 and Figure 6 As shown, the top edges of the outer back membrane 210 and the inner back membrane 220 are connected as one unit by a heat-sealing line 270 on a horizontally arranged air inlet channel. Two valve membranes 300 are disposed between the outer back membrane 210 and the inner back membrane 220, and the top edges of the two valve membranes 300, the outer back membrane 210, and the inner back membrane 220 are connected as one unit by a horizontally arranged air inlet heat-sealing line 500. At least one heat-resistant layer 400 is coated between the top edges of the two valve membranes 300 by printing, and the at least one heat-resistant layer 400 is distributed along the width direction of the valve membrane 300. The heat-resistant layer 400 spans the air inlet heat-sealing line 500 vertically. The heat-resistant layer 400 is coated before the heat-sealing process of the air inlet heat-sealing line 500. The heat-resistant layer 400 is not heat-sealed as one unit during the heat-sealing process, thus forming the air valve inlet.

[0038] like Figure 3 and Figure 6 As shown, an intake channel 290 is formed between the heat-sealing line 270 on the intake channel and the heat-sealing line 500 at the intake port. One end of the intake channel 290 is an air inlet, and the other end of the intake channel 290 is vertically sealed with an intake channel side heat-sealing line 271. The upper and lower ends of the intake channel side heat-sealing line 271 are connected to the heat-sealing line 270 on the intake channel and the heat-sealing line 500 at the intake port, respectively. The intake channel 290 is connected to the air inlet of the air valve.

[0039] During inflation, an external inflation device is inserted into the inflation port. Air enters the air inlet channel 290 through the inflation port, then enters the valve chamber between the two valve membranes 300 through the valve inlet, and then enters the membrane air chamber between the outer back membrane 210 and the inner back membrane 220. When the membrane air chamber is full and inflated, it compresses the valve membrane 300, causing the two valve membranes 300 to fit tightly together, automatically sealing the valve inlet and preventing gas leakage from the membrane air chamber.

[0040] like Figure 7 As shown, multiple valve membrane guide heat sealing lines 301 are provided between the two valve membranes 300. The valve membrane guide heat sealing lines 301 are distributed on the left and right sides of each valve inlet. The valve membrane guide heat sealing lines 301 can guide the air entering the valve cavity through the valve inlet, and guide the air evenly to the membrane cavity to ensure uniform inflation.

[0041] like Figure 3 As shown, the heat-sealing line on the upper part of the back membrane 200 adopts a primary longitudinal heat-sealing line 230, which extends from the air inlet heat-sealing line 500 to the middle of the back membrane 200 along its length. The primary longitudinal heat-sealing line 230 divides the upper part of the back membrane 200 into two inflatable primary air chambers, corresponding precisely to the mouth of the bottle-shaped item being wrapped. The upper opening of the primary air chamber is connected to the valve chamber. In the inflated state, the primary air chamber on the back, together with the primary air chamber on the front, forms a tight wrap around the mouth of the bottle-shaped item.

[0042] like Figure 3 As shown, the heat-sealing lines at the lower part of the back membrane 200 consist of three secondary longitudinal heat-sealing lines 240 and two tertiary longitudinal heat-sealing lines 241, which are alternately distributed along the width direction of the back membrane 200. Both the secondary and tertiary longitudinal heat-sealing lines 240 and 241 extend along the length direction of the back membrane 200, and the length of the tertiary longitudinal heat-sealing line 241 is greater than that of the secondary longitudinal heat-sealing line 240.

[0043] The secondary and tertiary longitudinal heat seal lines 240 and 241 on the back are positioned precisely to correspond to the body of the bottle-shaped item being wrapped. The portion of the tertiary heat seal line 241 that is longer than the secondary heat seal line 240 corresponds precisely to the bottom side of the bottle-shaped item. A portion of the secondary and tertiary heat seal lines 240 and 241 divide the middle part of the back film 200 into six secondary air chambers, which corresponds precisely to the body of the bottle-shaped item. Another portion of the tertiary heat seal line 241 divides the lower part of the back film 200 into three tertiary air chambers, which corresponds precisely to the bottom side of the bottle-shaped item. Depending on the needs, more or fewer secondary and tertiary heat seal lines 240 and 241 can be provided along the back film 200 to create different numbers of secondary and tertiary air chambers. The secondary air chambers on the front and back connect to form a tight wrap around the body of the bottle-shaped item.

[0044] like Figure 3 As shown, three arc-shaped heat-sealing lines 250 are provided at the bottom of the back membrane 200, spaced apart and forming a semi-circle. Lateral heat-sealing lines 260 are provided on the left and right sides of the bottom of the back membrane 200, extending along the width of the back membrane 200. These lateral heat-sealing lines 260 extend laterally from the side of the back membrane 200 to one end of the arc-shaped heat-sealing lines 250 on the side. The lateral heat-sealing lines 260 guide the incoming air, allowing air from the three-stage air chamber to enter the bottom air chamber. The arc-shaped heat-sealing lines 250 form a semi-circular bottom air chamber at the bottom of the back membrane 200, which corresponds precisely to the bottom of the bottle-shaped item being wrapped.

[0045] The bottom of bottle-shaped items is a structurally weak area, easily damaged by external impacts. Traditional air column bags cannot provide adequate protection for the bottom of bottle-shaped items. This invention, when inflated, connects the semi-circular bottom air chambers of the back membrane 200 and the front membrane 100 to form a circular bottom protection area. This area tightly wraps around the bottom of the bottle-shaped item, improving the tightness of the protection and preventing damage during transportation.

[0046] The working principle of this invention is as follows: When packaging bottle-shaped items, the bottle-shaped items are placed into an airbag through an opening. The airbag is then inflated. During inflation, an external inflation device is inserted into the inflation port. Air enters the air inlet channel 290 through the inflation port, then enters the valve chamber between the two valve membranes 300 through the valve inlet, and then enters the membrane air chamber between the outer back membrane 210 and the inner back membrane 220. When the membrane air chamber is full and inflated, it presses against the valve membrane 300, causing the two valve membranes 300 to fit tightly together, automatically sealing the valve inlet and preventing gas leakage from the membrane air chamber. The bottle mouth area of ​​the airbag inflates and adheres tightly to the bottle mouth of the bottle-shaped item; the bottle body area of ​​the airbag inflates and adheres tightly to the bottle body and bottom sides of the bottle-shaped item; and the bottom area of ​​the airbag inflates and adheres tightly to the bottom of the bottle-shaped item. Ultimately, this method achieves tight packaging of bottle-shaped items, preventing damage caused by shaking during transportation and improving the safety of product transport.

[0047] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. An airbag for bottle-shaped items, comprising a front film (100) and a back film (200) arranged correspondingly at the front and back, wherein the left and right sides of the front film (100) and the left and right sides of the back film (200) are sealed together by side heat-sealing lines, an opening is formed between the top edge of the front film (100) and the top edge of the back film (200), and a packaging space for accommodating bottle-shaped items is formed between the front film (100) and the back film (200); the front film (100) forms a front air cavity by a front outer film (110) and a front inner film (120), and the back film (200) forms a back air cavity by a back outer film (210) and a back inner film (220), wherein the front air cavity and the back air cavity are interconnected, characterized in that: The upper part of the front air cavity has M heat-sealing lines arranged vertically to form a bottle mouth covering area, and the lower part of the front air cavity has N heat-sealing lines arranged vertically to form a bottle body covering area. The upper part of the back air cavity has M heat-sealing lines arranged vertically to form a bottle mouth covering area, and the lower part of the back air cavity has N heat-sealing lines arranged vertically to form a bottle body covering area, where N > M, N is a positive integer, and M is a natural number. The bottle mouth covering area and the bottle body covering area of ​​the front air cavity are interconnected, and the bottle mouth covering area and the bottle body covering area of ​​the back air cavity are interconnected. The bottom of the front air cavity has multiple arc-shaped heat-sealing lines arranged to form a bottle bottom covering area, and the bottom of the back air cavity has multiple arc-shaped heat-sealing lines arranged to form a bottle bottom covering area.

2. An airbag for bottle-shaped articles as described in claim 1, characterized in that: The heat-sealing line at the bottom of the front membrane (100) adopts at least one front secondary longitudinal heat-sealing line (140) and at least one front tertiary longitudinal heat-sealing line (141). The front secondary longitudinal heat-sealing line (140) and the front tertiary longitudinal heat-sealing line (141) are alternately distributed along the width direction of the front membrane (100). The length dimension of the front tertiary longitudinal heat-sealing line (141) is greater than the length dimension of the front secondary longitudinal heat-sealing line (140).

3. An airbag for bottle-shaped articles as described in claim 1, characterized in that: The heat-sealing line at the bottom of the back film (200) adopts at least one secondary longitudinal heat-sealing line (240) and at least one tertiary longitudinal heat-sealing line (241). The secondary longitudinal heat-sealing line (240) and the tertiary longitudinal heat-sealing line (241) are alternately distributed along the width direction of the back film (200). The length of the tertiary longitudinal heat-sealing line (241) is greater than the length of the secondary longitudinal heat-sealing line (240).

4. An airbag for bottle-shaped articles as described in claim 1, characterized in that: The left and right sides of the front outer film (110) and the left and right sides of the front inner film (120) are sealed and connected as one unit by the front side heat sealing line (180), and the top edge of the front outer film (110) and the top edge of the front inner film (120) are sealed and connected as one unit by the front top edge heat sealing line (170).

5. An airbag for bottle-shaped articles as described in claim 4, characterized in that: The front membrane (100) is provided with a U-shaped tear-off part (190). The tear-off part (190) is located at the intersection of the upper heat sealing line of the front air cavity and the top edge heat sealing line (170). The left and right sides of the tear-off part (190) are separated from the main body of the front membrane (100), and the lower side of the tear-off part (190) is connected to the main body of the front membrane (100) as one unit.

6. An airbag for bottle-shaped articles as described in claim 4, characterized in that: The bottom edge of the back outer film (210) and the bottom edge of the front outer film (110) are connected as one unit, the bottom edge of the back inner film (220) and the bottom edge of the front inner film (120) are connected as one unit, and the left and right sides of the back outer film (210) and the left and right sides of the back inner film (220) are sealed and connected as one unit by the back side heat sealing line (280).

7. An airbag for bottle-shaped articles as described in claim 6, characterized in that: Two valve membranes (300) are provided between the back outer membrane (210) and the back inner membrane (220). The top edges of the two valve membranes (300), the back outer membrane (210) and the back inner membrane (220) are connected as one unit by a horizontally arranged air inlet heat sealing line (500). At least one heat-resistant layer (400) is coated between the top edges of the two valve membranes (300) by printing. The at least one heat-resistant layer (400) is distributed along the width direction of the valve membrane (300). The heat-resistant layer (400) spans the air inlet heat sealing line (500) above and below. An air valve inlet is formed at the position of the heat-resistant layer (400).

8. An airbag for bottle-shaped articles as described in claim 7, characterized in that: The top edge of the outer membrane (210) and the top edge of the inner membrane (220) are connected as one unit by a heat-sealing line (270) on the horizontally arranged air intake channel. An air intake channel (290) is formed between the heat-sealing line (270) on the air intake channel and the heat-sealing line (500) at the air inlet. One end of the air intake channel (290) is an air inlet. The other end of the air intake channel (290) is sealed by a heat-sealing line (271) on the side of the air intake channel. The upper and lower ends of the heat-sealing line (271) on the side of the air intake channel are connected to the heat-sealing line (270) on the air intake channel and the heat-sealing line (500) at the air inlet, respectively. The air intake channel (290) is connected to the air inlet of the air valve.

9. An airbag for bottle-shaped articles as described in claim 1, characterized in that: The front membrane (100) has a front transverse heat-sealing line (160) on the left and right sides of its bottom. The front transverse heat-sealing line (160) extends along the width direction of the front membrane (100) and extends laterally from the side of the front membrane (100) to one end of the arc heat-sealing line located on the side. The back membrane (200) has a back transverse heat-sealing line (260) on the left and right sides of its bottom. The back transverse heat-sealing line (260) extends along the width direction of the back membrane (200) and extends laterally from the side of the back membrane (200) to one end of the arc heat-sealing line located on the side.

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