CN116142631A - Single air valve film air column bag and air column bag production process - Google Patents
Single air valve film air column bag and air column bag production process Download PDFInfo
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- CN116142631A CN116142631A CN202310059605.7A CN202310059605A CN116142631A CN 116142631 A CN116142631 A CN 116142631A CN 202310059605 A CN202310059605 A CN 202310059605A CN 116142631 A CN116142631 A CN 116142631A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/02—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents specially adapted to protect contents from mechanical damage
- B65D81/03—Wrappers or envelopes with shock-absorbing properties, e.g. bubble films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
- B31D5/00—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles
- B31D5/0039—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles for making dunnage or cushion pads
- B31D5/0073—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles for making dunnage or cushion pads including pillow forming
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Abstract
The invention relates to a single air valve film air column bag which comprises an upper film, a lower film and an air valve film, wherein the air valve film is a single-layer film, high-temperature ink points are coated between the air valve film and the upper film and uniformly arranged at intervals, transverse sealing lines are arranged on the upper edge of the air valve film, the positions of the air valve film except the high-temperature ink points are thermally bonded with the upper film and the lower film by the transverse sealing lines to form an air inlet, and a viscous material is arranged between the lower part of the thermal bonding position of the air valve film and the upper film. Meanwhile, a production process of the air column bag is also provided. The single air valve film air column bag and the air column bag production process change the traditional double air valve film structure, shorten the width of the air valve film, effectively reduce the cost, and simultaneously, the production process is convenient and efficient and has low cost.
Description
Technical Field
The invention relates to the field of packaging materials, in particular to a single air valve film air column bag and a production process of the air column bag.
Background
In daily life, the air column bag is widely applied to express delivery and transportation as an economic and environment-friendly buffer packaging material. The most core technology in the air column bag realizes unidirectional inflation and air locking by utilizing an air valve film.
A schematic structure of a general air column bag is shown in fig. 1-3. In production, two air valve films 3 are heat-sealed between the upper film 1 and the lower film 2, wherein one air valve film 3 is coated with high-temperature ink, the heat-sealing ensures that the ink-coated area is not bonded to form an air inlet 71, and meanwhile, adhesive materials are coated between the two air valve films 3. At the start of inflation, gas enters from the gas inlet 71, and the two gas valve membranes 3 in the gas column chamber 5 are opened, so that gas can enter the gas column chamber 5. When the air is continuously filled to enable the air pressure of the air column cavity 5 to be continuously increased, the air tightly clings to the two air valve films 3, so that air locking is realized. In order to ensure the air locking effect, a plurality of air guide points 0 are arranged at the position of the air outlet 10 of the air valve film 3 in a common air column bag, air is split during air inlet, the probability of backflow of the air from the air inlet is reduced after the air pressure is increased, and the air locking effect is enhanced.
The air column bag has the advantages that the structure is mature, the air locking effect is good, but because air enters the air column cavity from the middle of the two air valve films, on one hand, an air guide point is required to be arranged in a certain size space, on the other hand, the air valve films have larger area to bear pressure so as to improve the attaching probability, and the sufficient air locking success rate is ensured, so that the width of the air valve films is larger, the cost occupied by the air valve films in the whole air column bag is higher, and the economic benefit is poor.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the single air valve film air column bag and the air column bag production process, which change the traditional double air valve film structure, shorten the width of the air valve film, effectively reduce the cost, and simultaneously, the production process is convenient and efficient and has low cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a single air valve membrane gas column bag, including last film, lower film and air valve membrane, go up the film and seal down the film all around and form the bag body, be equipped with vertical sealing line on the bag body and form the gas column chamber of arranging side by side, the top in gas column chamber is equipped with the air inlet channel, the air valve membrane is the individual layer membrane, the air valve membrane sets up between last film and lower film, scribble high temperature printing ink point between air valve membrane and the last film, high temperature printing ink point locates and even interval setting in the last border of air valve membrane, the last border of air valve membrane is equipped with horizontal sealing line, horizontal sealing line is with the position except high temperature printing ink point and last film and lower film thermobonding connection and is formed the air inlet, be equipped with the viscous material between air valve membrane thermobonding position below part and the last film.
When the air is inflated, air flows from the air inlet channel to the air inlet and enters the air column cavity from the air inlet, after the air column cavity is filled with the air, the air pressure is increased, and the reflux air flows to the lower part of the hot bonding position of the air valve film and is opposite to one side of the air inlet side, so that the side pressure is continuously increased, and finally the air valve film is pressed to the upper film. Because the viscous material is arranged between the air valve film and the upper film, the air inlet is blocked, and air locking is realized. By adopting the structure, no air guide point is needed, and the reflux air completely acts on the sealing air valve film, so that the width of the air valve film can be greatly shortened.
Further, the single air valve film air column bag is also provided with an air guiding sealing thread, the air guiding sealing thread enables the air valve film to be in thermal adhesion connection with the upper film and the lower film, the air guiding sealing thread is respectively arranged on two sides of the high-temperature ink point, one end of the air guiding sealing thread is connected with the transverse sealing thread, and one ends of the air guiding sealing threads are mutually gathered to form an air outlet.
Further, the air-entraining seal line comprises a side seal part and an adduction part, wherein the side seal part extends from the transverse seal line to the bottom of the high-temperature ink point along a straight line, one end of the adduction part is connected with the side seal part, and the other end of the adduction part extends to the lower edge of the air valve film along an arc line. The arrangement of the gas seal secant can enable gas to enter the gas column cavity rapidly and intensively, so that the inflation efficiency is improved.
Further, the width of the air inlet is 1.5-2 times of the width of the air outlet. Under the conventional state, because the air valve film and the upper film are sticky, a certain force is needed to wash the air valve film away, and by adopting the width proportion, proper air flow rate can be ensured, and the smoothness of inflation is ensured.
Furthermore, the single air valve film air column bag is also provided with a top sealing bonding line, the lower edge of the air valve film is thermally bonded with the upper film by the top sealing bonding line, and the top sealing bonding line is not connected with the vertical sealing cutting line to form an air outlet. When the lower end of the air valve film is completely free, a certain probability exists in the process of inflation, so that the air valve film can be stuck to the lower film, and the air locking failure is caused. After the top sealing bonding line is arranged, the lower end of the air valve film is bonded with the upper film, and air is introduced from a gap between the top sealing bonding line and the vertical sealing cutting line, so that the condition that the air valve film is adhered to the lower film can be eliminated.
Further, the single air valve film air column bag is also provided with a side adhesive line, the side adhesive line extends from the transverse sealing line to the lower edge of the air valve film along a straight line, and an air outlet is formed between the side adhesive line and the top sealing adhesive line. The arrangement of the side sticky lines can enable gas to enter the gas column cavity rapidly and intensively, and the inflation efficiency is improved.
Furthermore, a connecting sealing bonding wire is arranged between the side bonding wire and the top sealing bonding wire, and a notch is arranged on the connecting sealing bonding wire to form an air outlet. In some occasions, the inflation pressure is larger, the shorter top sealing bonding wire can not resist the impact of air flow, and the connection strength of the air valve film and the upper film is improved due to the arrangement of the connection sealing bonding wire.
Furthermore, the positions of the lower film corresponding to the side bonding line, the top sealing bonding line and the connecting sealing bonding line are provided with anti-sticking ink points. The anti-sticking ink points are arranged, so that the air valve film can be subjected to side bonding, top sealing bonding and connecting bonding line processing after being thermally bonded on the upper film and the lower film, and the single air valve film air column bag can completely adopt original common air valve film production equipment and technological process, and reduce the transformation cost.
Further, the high temperature ink dots and the viscous material are all disposed on the air valve film. Also, such a design is intended to further reduce the retrofitting costs in order to follow the conventional production equipment of the air column bag.
The invention also provides a production process of the air column bag, which is used for producing the single air valve film air column bag according to claim 6, and sequentially comprises the following steps:
s1, spot-coating high-temperature ink spots on the upper part of an air valve film, and drying;
s2, coating a viscous material on the lower part of one side of the air valve film coated with the high-temperature ink dots;
s3, enabling one surface of the air valve film coated with the high-temperature ink points to be opposite to the upper film, and performing heat sealing on the upper film and the air valve film through a sealing die to form a side bonding line and a top sealing bonding line;
s4, the upper film sealed with the air valve film is opposite to the lower film, and the peripheries of the upper film and the lower film are heat-sealed by a peripheral sealing die to form a bag body;
s5, heat-sealing a vertical sealing line through a column sealing die to form an air column cavity;
s6, heat-sealing a transverse sealing line through a transverse sealing die, and sealing and adhering the air valve film with the upper film and the lower film.
The air column bag produced by the production process has attractive appearance, avoids the arrangement of anti-sticking ink points, and controls the production cost.
In summary, the technical problem to be solved by the invention is to provide a single air valve film air column bag and an air column bag production process, which change the traditional double air valve film structure, shorten the width of the air valve film, effectively reduce the cost, and simultaneously, the production process is convenient and efficient and has low cost.
Drawings
The invention is described in further detail below with reference to the drawings and detailed description.
FIG. 1 is a schematic view of the front of a typical air column bag;
FIG. 2 is a schematic side view of a typical column bag when inflated;
FIG. 3 is a schematic side view of a typical column bag when inflation is complete;
fig. 4 is a schematic diagram of the front surface of the single air valve film air column bag according to the embodiment;
FIG. 5 is a schematic diagram of the structure of the side face of the single air valve film air column bag in the embodiment when the air column bag is inflated;
FIG. 6 is a schematic diagram of the side face of the single air valve film air column bag according to the embodiment when the air inflation is completed;
fig. 7 is a schematic diagram of the front side of the single air valve film air column bag of the present embodiment when the side bonding line and the top sealing bonding line are provided;
FIG. 8 is a schematic side view of the single air valve membrane cartridge of FIG. 7 when inflated;
FIG. 9 is a schematic side elevational view of the single air valve membrane cartridge of FIG. 7 after inflation is complete;
FIG. 10 is a schematic view of the front side of the single air valve film air column bag of the present embodiment with side bonding lines, top sealing bonding lines, connecting sealing bonding lines, and ink-sticking preventing points;
the device comprises an air guide point-0, an upper film-1, a lower film-2, an air valve film-3, a vertical sealing line-4, an air column cavity-5, an air inlet channel-6, a high-temperature ink point-7, an air inlet-71, a transverse sealing line-8, an air-entraining sealing line-9, a side sealing part-91, an inner receiving part-92, an air outlet-10, a top sealing bonding line-11, a side bonding line-12, a connecting sealing bonding line-13 and an ink adhesion preventing point-14.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The single air valve film air column bag as shown in fig. 3-5 comprises an upper film 1, a lower film 2 and an air valve film 3, wherein the peripheries of the upper film 1 and the lower film 2 are sealed to form a bag body, a vertical sealing line 4 is arranged on the bag body to form an air column cavity 5 which is arranged in parallel, an air inlet channel 6 is arranged at the top of the air column cavity 5, the air valve film 3 is a single-layer film, the air valve film 3 is arranged between the upper film 1 and the lower film 2, high-temperature ink points 7 are coated between the air valve film 3 and the upper film 1, the high-temperature ink points 7 are arranged at the upper edge of the air valve film 3 at uniform intervals, transverse sealing lines 8 are arranged at the upper edge of the air valve film 3, the positions of the air valve film 3 except the high-temperature ink points 7 are thermally bonded with the upper film 1 and the lower film 2 to form an air inlet 71, and a viscous material is arranged between the lower part of the thermal bonding position of the air valve film 3 and the upper film 1.
When the air is inflated, air flows from the air inlet channel 6 to the air inlet 71 and enters the air column cavity 5 from the air inlet 71, after the air column cavity 5 is filled with the air, the air pressure is increased, and the backflow air flows to the part below the hot bonding position of the air valve film 3 and is opposite to the side of the air inlet side, so that the side pressure is increased continuously, and finally the air valve film 3 is pressed to the upper film 1. The air inlet 71 is blocked due to the viscous material between the air valve membrane 3 and the upper membrane 1, so that air locking is realized. By adopting the structure, the air guide point 0 is not required to be arranged, and the reflux air completely acts on the sealing air valve film 3, so that the width of the air valve film 3 can be greatly shortened. In general, the width of the air valve film 3 designed according to the scheme can be reduced to a size within 40mm, and the width of the conventional air column bag air valve film can reach 50mm or even more than 60 mm.
In this embodiment, the single air valve film air column bag is further provided with an air-guiding sealing cut line 9, the air-guiding sealing cut line 9 enables the air valve film 3 to be thermally adhered to the upper film 1 and the lower film 2, the air-guiding sealing cut lines 9 are respectively arranged on two sides of the high-temperature ink point 7, one end of the air-guiding sealing cut line 9 is connected with the transverse sealing cut line 8, and one ends of the air-guiding sealing cut lines 9 are mutually gathered to form an air outlet 10.
Specifically, the air-entraining seal line 9 includes a side seal portion 91 and an inner fold portion 92, the side seal portion 91 extends from the transverse seal line 8 to the bottom of the high-temperature ink dot 7 along a straight line, one end of the inner fold portion 92 is connected with the side seal portion 91, and the other end of the inner fold portion 92 extends to the lower edge of the air valve film 3 along an arc line. The arrangement of the air-entraining sealing cut line 9 can enable air to enter the air column cavity 5 quickly and intensively, so that the inflation efficiency is improved.
Preferably, the width of the air inlet 71 is 1.5-2 times the width of the air outlet 10. The preferred size choice is that the air inlet 71 is designed to be 12mm and the air outlet 10 is designed to be 8mm. Under the conventional state, because the air valve membrane 3 and the upper membrane 1 have viscosity, a certain force is required to wash the air valve membrane away, and by adopting the width proportion, proper air flow rate can be ensured, and the smoothness of inflation is ensured.
As another embodiment, as shown in fig. 7-9, the single air valve film air column bag is further provided with a top sealing adhesive line 11, wherein the top sealing adhesive line 11 makes the lower edge of the air valve film 3 thermally adhere to the upper film 1, and the top sealing adhesive line 11 is not connected with the vertical sealing cutting line 4 to form an air outlet 10. When the lower end of the air valve film 3 is completely free, a certain probability exists in inflation, so that the air valve film 3 is attached to the lower film 2, and air locking failure is caused. After the top sealing bonding line 11 is arranged, the lower end of the air valve film 3 is bonded with the upper film 1, and air is introduced from the gap between the top sealing bonding line 11 and the vertical sealing cutting line 4, so that the condition that the air valve film 3 is attached to the lower film 2 can be eliminated.
Similarly, the single air valve film air column bag is also provided with a side adhesive line 12, the side adhesive line 12 extends from the transverse sealing line 8 to the lower edge of the air valve film 3 along a straight line, and an air outlet 10 is formed between the side adhesive line 12 and the top sealing adhesive line 11. The arrangement of the side bonding wires 12 can also enable gas to enter the gas column cavity rapidly and intensively, so that the inflation efficiency is improved.
As shown in fig. 10, a connection sealing line 13 is further arranged between the side adhesive line 12 and the top sealing adhesive line 11, and a notch is arranged on the connection sealing line 13 to form the air outlet 10. In some cases, the inflation pressure is high, the shorter top sealing bonding wire 11 may not resist the impact of the air flow, and the connection strength of the air valve film 3 and the upper film 1 is improved by the arrangement of the connection sealing bonding wire 13.
Alternatively, the positions of the lower film 2 corresponding to the side adhesive lines 12, the top sealing adhesive line 11 and the connecting sealing adhesive line 13 are provided with anti-sticking ink points 14. The arrangement of the anti-sticking ink points 14 can enable the air valve film 3 to process the side bonding line 12, the top sealing bonding line 11 and the connecting sealing bonding line 13 after being thermally bonded on the upper film 1 and the lower film 2, so that the single air valve film air column bag can completely adopt original general air column bag production equipment and process flow, and reduce the transformation cost.
In both embodiments, the high temperature ink dots 7 and the viscous material are provided on the gas valve membrane 3. Also, such a design is to further reduce the modification cost in order to follow the conventional production equipment of the air valve membrane 3.
The invention also provides a production process of the air column bag, which is used for producing the single air valve film air column bag according to claim 6, and sequentially comprises the following steps:
s1, spot-coating high-temperature ink spots 7 on the upper part of an air valve film 3, and drying;
s2, coating a viscous material on the lower part of one side of the air valve film 3 coated with the high-temperature ink dots 7;
s3, the surface of the air valve film 3 coated with the high-temperature ink points is opposite to the upper film 1, and the upper film 1 and the air valve film 3 are heat-sealed through a sealing mold to form a side bonding line 12 and a top sealing bonding line 11;
s4, the upper film 1 sealed with the air valve film 3 is opposite to the lower film 2, and the peripheries of the upper film 1 and the lower film 2 are heat-sealed by a peripheral sealing die to form a bag body;
s5, heat-sealing the vertical sealing line 4 through a column sealing die to form an air column cavity 5;
s6, heat-sealing the transverse sealing line 8 through a transverse sealing die, and sealing and adhering the air valve film 3 with the upper film 1 and the lower film 2.
The air column bag produced by the production process has attractive appearance, avoids the arrangement of anti-sticking ink points, and controls the production cost.
It should be noted that, due to the arrangement of the air-entraining seal line 9, the side seal line 12, the top seal line 11 and the connecting seal line 13, the interval between the air valve film 3 and the upper film 1 and the lower film 2 may not be as large as that shown in the drawings, and the schematic side structure of the air column bag is enlarged for convenience of description.
In summary, the technical problem to be solved by the invention is to provide a single air valve film air column bag and an air column bag production process, which change the traditional double air valve film structure, shorten the width of the air valve film, effectively reduce the cost, and simultaneously, the production process is convenient and efficient and has low cost.
In summary, the foregoing description is only of the preferred embodiments of the invention, and is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. The utility model provides a single air valve membrane gas column bag, includes film, lower film and air valve membrane, the sealing forms the bag body around last film and the lower film, be equipped with vertical sealing line on the bag body and form the gas column chamber of arranging side by side, the top in gas column chamber is equipped with the air inlet channel, its characterized in that, the air valve membrane is the individual layer membrane, the air valve membrane sets up between last film and lower film, scribble high temperature printing ink point between air valve membrane and the last film, high temperature printing ink point just evenly spaced sets up in the last border department of air valve membrane, the last border of air valve membrane is equipped with horizontal sealing line, horizontal sealing line forms the air inlet with the position and last film and the lower film thermobonding of air valve membrane except high temperature printing ink point, be equipped with the viscous material between air valve membrane thermobonding position below part and the last film.
2. The single air valve membrane cartridge of claim 1 wherein: the air-entraining sealing line is used for enabling the air valve film to be in thermal adhesion connection with the upper film and the lower film, the air-entraining sealing lines are respectively arranged on two sides of the high-temperature ink point, one end of each air-entraining sealing line is connected with the transverse sealing line, and one ends of the air-entraining sealing lines are mutually gathered to form an air outlet.
3. The single air valve membrane cartridge of claim 2 wherein: the air-entraining seal line comprises a side seal part and an adduction part, the side seal part extends from the transverse seal line to the bottom of the high-temperature ink point along a straight line, one end of the adduction part is connected with the side seal part, and the other end of the adduction part extends to the lower edge of the air valve film along an arc line.
4. The single air valve membrane cartridge of claim 2 wherein: the width of the air inlet is 1.5-2 times of that of the air outlet.
5. The single air valve membrane cartridge of claim 1 wherein: the air valve film is characterized by further comprising a top sealing bonding line, wherein the top sealing bonding line enables the lower edge of the air valve film to be in thermal adhesion connection with the upper film, and the top sealing bonding line is not connected with the vertical sealing cutting line to form an air outlet.
6. The single air valve membrane cartridge of claim 5 wherein: the side bonding line extends from the transverse sealing line to the lower edge of the air valve film along a straight line, and an air outlet is formed between the side bonding line and the top sealing bonding line.
7. The single air valve membrane cartridge of claim 6 wherein: and a connecting sealing bonding line is further arranged between the side bonding line and the top sealing bonding line, and a notch is arranged on the connecting sealing bonding line to form an air outlet.
8. The single air valve membrane cartridge of claim 7 wherein: and the positions of the lower film corresponding to the side bonding line, the top sealing bonding line and the connecting sealing bonding line are provided with anti-sticking ink points.
9. A single air valve membrane cartridge according to any one of claims 1-8, wherein: the high-temperature ink dots and the viscous material are arranged on the air valve film.
10. A process for producing a single air valve film air column bag according to claim 6, which is characterized in that: the method sequentially comprises the following steps:
s1, spot-coating high-temperature ink spots on the upper part of an air valve film, and drying;
s2, coating a viscous material on the lower part of one side of the air valve film coated with the high-temperature ink dots;
s3, enabling one surface of the air valve film coated with the high-temperature ink points to be opposite to the upper film, and performing heat sealing on the upper film and the air valve film through a sealing die to form a side bonding line and a top sealing bonding line;
s4, the upper film sealed with the air valve film is opposite to the lower film, and the peripheries of the upper film and the lower film are heat-sealed by a peripheral sealing die to form a bag body;
s5, heat-sealing a vertical sealing line through a column sealing die to form an air column cavity;
s6, heat-sealing a transverse sealing line through a transverse sealing die, and sealing and adhering the air valve film with the upper film and the lower film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310059605.7A CN116142631A (en) | 2023-01-18 | 2023-01-18 | Single air valve film air column bag and air column bag production process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310059605.7A CN116142631A (en) | 2023-01-18 | 2023-01-18 | Single air valve film air column bag and air column bag production process |
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| CN116142631A true CN116142631A (en) | 2023-05-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707879A (en) * | 2019-03-01 | 2019-05-03 | 天津茂创科技发展有限公司 | A kind of gas check valve and its application in gas chamber packaging structure |
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