CN113021940A - Hand-pasted die pressing vacuum auxiliary forming die and forming process - Google Patents
Hand-pasted die pressing vacuum auxiliary forming die and forming process Download PDFInfo
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- CN113021940A CN113021940A CN202110219137.6A CN202110219137A CN113021940A CN 113021940 A CN113021940 A CN 113021940A CN 202110219137 A CN202110219137 A CN 202110219137A CN 113021940 A CN113021940 A CN 113021940A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/345—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using matched moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention relates to a hand lay-up mould pressing vacuum auxiliary forming mould and a forming process, the hand lay-up mould pressing vacuum auxiliary forming mould is used for vacuum auxiliary forming of products, and the hand lay-up mould pressing vacuum auxiliary forming mould comprises: the device comprises a sealing film, a breathable glue absorbing material, a vacuumizing tube, an upper die and a lower die; a product die cavity is formed between the upper die and the lower die, and a sealing film is arranged in the product die cavity; the product pre-shaped rough blank is wrapped in the sealing film, and the product pre-shaped rough blank wrapped with the sealing film is positioned in the product mold cavity; and both sides of the sealing film are provided with air-permeable glue-absorbing materials, the air-permeable glue-absorbing materials are connected with a vacuumizing tube, and the vacuumizing tube is connected with an external vacuumizing device. The hand lay-up mould pressing vacuum auxiliary forming mould and the forming process provided by the invention have the advantages of low cost, high efficiency, convenience in operation, capability of saving the appearance post-treatment time and the mould cleaning time and capability of prolonging the service life of the mould.
Description
Technical Field
The invention relates to an auxiliary forming die and a forming process, in particular to a hand lay-up die pressing vacuum auxiliary forming die and a forming process which have the advantages of low cost, high efficiency and convenient operation and can save the appearance post-processing time and the die cleaning time.
Background
The carbon fiber composite material is used as a novel material with excellent mechanical property, the application of the novel material is more and more extensive in various industries, the forming process for manufacturing products by using the carbon fiber composite material is very many, the common forming processes comprise mould pressing, bag pressing, hand pasting, autoclave, vacuum filling and the like, and each forming process has respective advantages and disadvantages.
The appearance of the product with high molding temperature of the die pressing process is easy to have flaws, the appearance of the product needs to be subjected to post-processing, and the product cannot be directly taken as a finished product for shipment; the hand pasting process has poor sanitary conditions, poor product performance stability and lower product mechanical properties; the autoclave process has large investment, high cost and long molding period.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to provide a vacuum assisted forming mold and forming process for hand lay-up molding, which has the advantages of low cost, high efficiency, convenient operation, and capability of saving the post-treatment time of appearance and the cleaning time of the mold.
The invention solves the technical problems through the following technical scheme: a hand lay-up molding vacuum assisted molding die for vacuum assisted molding of a product, the hand lay-up molding vacuum assisted molding die comprising: the device comprises a sealing film, a breathable glue absorbing material, a vacuumizing tube, an upper die and a lower die;
a product die cavity is formed between the upper die and the lower die, and a sealing film is arranged in the product die cavity;
the product pre-shaped rough blank is wrapped in the sealing film, and the product pre-shaped rough blank wrapped with the sealing film is positioned in the product mold cavity;
and both sides of the sealing film are provided with air-permeable glue-absorbing materials, the air-permeable glue-absorbing materials are connected with a vacuumizing tube, and the vacuumizing tube is connected with an external vacuumizing device.
In an embodiment of the present invention, the product preform is a product preform composed of a high-strength fiber cloth and a resin.
In an embodiment of the present invention, the thickness of the sealing film is in the range of: 0.1-1.0 mm.
In the embodiment of the invention, the sealing film is made of one or a mixture of two of PVC and EVA.
In the embodiment of the invention, the gram weight ratio of the high-strength fiber cloth and the resin is in the range of: 8-100: 1.
a hand lay-up die pressing vacuum assisted forming process, comprising the steps of:
step 1: preparing high-strength fiber cloth, a sealing film 2 and resin with proper weight in corresponding sizes according to the structure and the overall dimension of a product;
step 2: flatly laying the sealing film on a working table top or a special pre-forming jig, and attaching a sealing adhesive tape to more than half of one length side and the adjacent width side of the sealing film;
and step 3: the high-strength fiber cloth is flatly laid on the half side position of the sealing film stuck with the sealing adhesive tape, and resin is uniformly coated on the high-strength fiber cloth with proper thickness in the laying process, so that the resin is fully soaked and laid on each layer of the high-strength fiber cloth to prepare a product pre-forming rough blank;
and 4, step 4: putting appropriate air-permeable adhesive-absorbing materials 3 on the edges of the periphery of the product preformed rough blank, folding the sealing film in half according to the edges of the product preformed rough blank, putting a vacuumizing air nozzle, and then bonding and sealing the sealing film by using a bonded sealing adhesive tape;
and 5: connecting a vacuum air pipe to the sealed product pre-molded rough blank, vacuumizing, and uniformly and orderly scraping out air bubbles in the product pre-molded rough blank by using a scraper plate;
step 6: putting the product pre-molded rough blank into a mold, and heating, pressurizing, curing and molding to obtain a product rough blank;
and 7: and curing the molded product rough blank, and machining the product into a product through CNC according to the overall dimension and the assembly requirement of the product.
In the embodiment of the present invention, the resin coated on the carbon fiber cloth in the step (3) is a thermosetting resin.
In the embodiment of the invention, the thermosetting resin is one or a mixture of epoxy resin, phenolic resin and vinyl resin.
In the embodiment of the invention, the sealing film material is one or a mixture of PVC and EVA.
In the specific implementation example of the invention, the temperature for heating and curing in the step (6) is 20-80 ℃, the time is 30-1440min, and the pressure is 10-800 Kpa.
The positive progress effects of the invention are as follows: the hand lay-up mould pressing vacuum auxiliary forming mould and the forming process provided by the invention have the advantages of low cost, high efficiency, convenience in operation, capability of saving the appearance post-treatment time and the mould cleaning time and capability of prolonging the service life of the mould.
Drawings
Fig. 1 is a schematic view of the overall structure of the hand lay-up molding vacuum assisted molding die provided by the invention.
The following are the names corresponding to the reference numbers in the invention:
the device comprises a product pre-forming rough blank 1, a sealing film 2, a breathable glue absorbing material 3, a vacuumizing tube 4, an upper die 5 and a lower die 6.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the hand lay-up molding vacuum assisted molding die provided by the invention. As shown in the above figures: the invention provides a hand lay-up mould pressing vacuum auxiliary forming mould, which is used for vacuum auxiliary forming of products and comprises: the device comprises a sealing film 2, a breathable glue absorbing material 3, a vacuumizing pipe 4, an upper die 5 and a lower die 6.
A product die cavity is formed between the upper die 5 and the lower die 6, and a sealing film 2 is arranged in the product die cavity; the product pre-forming rough blank 1 is wrapped in the sealing film 2, and the product pre-forming rough blank 1 wrapped with the sealing film 2 is positioned in a product die cavity; the two sides of the sealing film 2 are provided with air-permeable glue-absorbing materials 3, the air-permeable glue-absorbing materials 3 are connected with vacuum pipes 4, and the vacuum pipes 4 are connected with an external vacuum extractor.
The product preform 1 is a product preform composed of high-strength fiber cloth and resin.
In the specific implementation process of the invention, the gram weight ratio range of the high-strength fiber cloth and the resin is as follows: 10-30: 1, the thickness range of the sealing film 2 is: 0.1-1.0mm, and in the specific implementation process, the parameters can be adjusted into other data according to the requirements.
The resin used in the invention is a thermosetting resin, and the thermosetting resin is one or a mixture of epoxy resin, phenolic resin and vinyl resin.
The sealing film material is a high-temperature resistant material, has the functions of sealing, vacuumizing, improving the appearance of a product and isolating the product from a mold, and is one or a mixture of PVC and EVA.
A hand lay-up mould pressing vacuum auxiliary forming process comprises the following steps:
step 1: preparing high-strength fiber cloth, a sealing film 2 and resin with proper weight in corresponding sizes according to the structure and the overall dimension of a product;
step 2: the sealing film 2 is flatly laid on a working table top or a special pre-forming jig, and more than half of one length side and the adjacent width side of the sealing film are attached with a sealing adhesive tape;
and step 3: the high-strength fiber cloth is flatly laid on the half side position of the sealing film stuck with the sealing adhesive tape, and resin is uniformly coated on the high-strength fiber cloth with proper thickness in the laying process, so that the resin is fully soaked and laid on each layer of the high-strength fiber cloth to prepare a product pre-forming rough blank;
and 4, step 4: putting appropriate air-permeable adhesive-absorbing materials 3 on the edges of the periphery of the product preformed rough blank, folding the sealing film in half according to the edges of the product preformed rough blank, putting a vacuumizing air nozzle, and then bonding and sealing the sealing film by using a bonded sealing adhesive tape;
and 5: connecting a vacuum air pipe to the sealed product pre-molded rough blank, vacuumizing, and uniformly and orderly scraping out air bubbles in the product pre-molded rough blank by using a scraper plate;
step 6: putting the product pre-molded rough blank into a mold, and heating, pressurizing, curing and molding to obtain a product rough blank;
and 7: and curing the molded product rough blank, and machining the product into a product through CNC according to the overall dimension and the assembly requirement of the product.
Wherein in the step (3), the resin coated on the carbon fiber cloth is thermosetting resin.
The thermosetting resin is one or a mixture of epoxy resin, phenolic resin and vinyl resin.
The sealing film material is a high-temperature resistant material and has the functions of sealing, vacuumizing, improving the appearance of a product and isolating the product from a mold; the sealing film material is one or a mixture of PVC and EVA.
In the step (6), the temperature for heating and curing is 20-80 ℃, the time is 30-1440min, and the pressure is 10-800 Kpa.
The following are specific examples of implementation:
example 1:
in the first step, the specification of 6K is selected and the unit weight is 300g/m2Carbon fiber cloth, PVC film with the width of 1.5m and the thickness of 0.2mm and PMI foam filling material.
And secondly, flatly laying the sealing film on a special pre-forming jig, and attaching a high-temperature double-sided adhesive tape to more than half of one length side and the adjacent width side of the sealing film.
And thirdly, flatly laying the carbon fiber cloth and the filling material on the half side position of the sealing film with the double-sided adhesive tape attached, and uniformly coating epoxy resin on the carbon fiber cloth with proper thickness in the laying process to enable the resin to fully soak and lay each layer of the carbon fiber cloth.
And fourthly, placing proper air felts on the edges of the periphery of the product preformed rough blank, folding the PVC film in half according to the edges of the product preformed rough blank, placing a vacuumizing air nozzle, and then bonding and sealing the PVC film by using the bonded double-sided adhesive tape.
And fifthly, connecting the sealed product pre-forming rough blank vacuum air nozzle with a vacuum air pipe for vacuumizing, and simultaneously, uniformly and orderly scraping out air bubbles in the product pre-forming rough blank by using a scraper.
Sixthly, putting the product pre-molded rough blank into a mold for curing molding: setting the temperature: 50 ℃, heat preservation time: 120min, set pressure: 200Kpa, dwell time: and (3) cooling for 120min, reducing the pressure, opening the mold, and taking out the product.
And seventhly, machining the solidified and molded product rough blank into a product through CNC (computer numerical control) according to a product 3D (three-dimensional) drawing file.
Example 2
In the first step, the specification of 12K is selected and the unit weight is 600g/m2Carbon fiber cloth, a PVC film with the width of 1.1m and the thickness of 0.2mm, and PMMA foam filling materials.
And secondly, flatly laying the sealing film on a special pre-forming jig, and attaching a high-temperature double-sided adhesive tape to more than half of one length side and the adjacent width side of the sealing film.
And thirdly, flatly laying the carbon fiber cloth and the filling material on the half side position of the sealing film with the double-sided adhesive tape attached, and uniformly coating epoxy resin on the carbon fiber cloth with proper thickness in the laying process to enable the resin to fully soak and lay each layer of the carbon fiber cloth.
And fourthly, placing proper air felts on the edges of the periphery of the product preformed rough blank, folding the PVC film in half according to the edges of the product preformed rough blank, placing a vacuumizing air nozzle, and then bonding and sealing the PVC film by using the bonded double-sided adhesive tape.
And fifthly, connecting the sealed product pre-forming rough blank vacuum air nozzle with a vacuum air pipe for vacuumizing, and simultaneously, uniformly and orderly scraping out air bubbles in the product pre-forming rough blank by using a scraper.
Sixthly, putting the product pre-molded rough blank into a mold for curing molding: setting the temperature: temperature preservation time at 40 ℃: 150min, set pressure: 100Kpa, dwell time: cooling for 150min, lowering pressure, opening the mold, and taking out the product.
And seventhly, machining the solidified and molded product rough blank into a product through CNC (computer numerical control) according to a product 3D (three-dimensional) drawing file.
Example 3
In the first step, the specification of 12K is selected and the unit weight is480g/m2Carbon fiber cloth, PVC film with the width of 1m and the thickness of 0.2mm, and PMMA foam filling material.
And secondly, flatly laying the sealing film on a special pre-forming jig, and attaching a high-temperature double-sided adhesive tape to more than half of one length side and the adjacent width side of the sealing film.
And thirdly, flatly laying the carbon fiber cloth and the filling material on the half side position of the sealing film with the double-sided adhesive tape attached, and uniformly coating epoxy resin on the carbon fiber cloth with proper thickness in the laying process to enable the resin to fully soak and lay each layer of the carbon fiber cloth.
And fourthly, placing proper air felts on the edges of the periphery of the product preformed rough blank, folding the PVC film in half according to the edges of the product preformed rough blank, placing a vacuumizing air nozzle, and then bonding and sealing the PVC film by using the bonded double-sided adhesive tape.
And fifthly, connecting the sealed product pre-forming rough blank vacuum air nozzle with a vacuum air pipe for vacuumizing, and simultaneously, uniformly and orderly scraping out air bubbles in the product pre-forming rough blank by using a scraper.
Sixthly, putting the product pre-molded rough blank into a mold for curing molding: setting the temperature: 25 ℃, heat preservation time: 720min, set pressure: 100Kpa, dwell time: and 720min, cooling, reducing the pressure, opening the mold and taking out the product.
And seventhly, machining the solidified and molded product rough blank into a product through CNC (computer numerical control) according to a product 3D (three-dimensional) drawing file.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. A hand lay-up mould pressing vacuum assisted forming mould, the vacuum assisted forming mould of hand lay-up mould pressing is used for the vacuum assisted forming of product, its characterized in that: the hand lay-up mould pressing vacuum auxiliary forming mould comprises: the device comprises a sealing film, a breathable glue absorbing material, a vacuumizing tube, an upper die and a lower die;
a product die cavity is formed between the upper die and the lower die, and a sealing film is arranged in the product die cavity;
the product pre-shaped rough blank is wrapped in the sealing film, and the product pre-shaped rough blank wrapped with the sealing film is positioned in the product mold cavity;
and both sides of the sealing film are provided with air-permeable glue-absorbing materials, the air-permeable glue-absorbing materials are connected with a vacuumizing tube, and the vacuumizing tube is connected with an external vacuumizing device.
2. The hand lay-up molding vacuum assisted forming mold of claim 1, wherein: the product pre-shaped rough blank is composed of high-strength fiber cloth and resin.
3. The hand lay-up molding vacuum assisted forming mold of claim 1, wherein: the thickness range of the sealing film is as follows: 0.1-1.0 mm.
4. The hand lay-up molding vacuum assisted forming mold of claim 1, wherein: the sealing film is made of one or a mixture of PVC and EVA.
5. The hand lay-up molding vacuum assisted forming mold of claim 2, wherein: the gram weight ratio range of the high-strength fiber cloth and the resin is as follows: 8-100: 1.
6. a hand lay-up mould pressing vacuum auxiliary forming process is characterized in that: the molding process comprises the following steps:
step 1: preparing high-strength fiber cloth, a sealing film 2 and resin with proper weight in corresponding sizes according to the structure and the overall dimension of a product;
step 2: flatly laying the sealing film on a working table top or a special pre-forming jig, and attaching a sealing adhesive tape to more than half of one length side and the adjacent width side of the sealing film;
and step 3: the high-strength fiber cloth is flatly laid on the half side position of the sealing film stuck with the sealing adhesive tape, and resin is uniformly coated on the high-strength fiber cloth with proper thickness in the laying process, so that the resin is fully soaked and laid on each layer of the high-strength fiber cloth to prepare a product pre-forming rough blank;
and 4, step 4: putting appropriate air-permeable adhesive-absorbing materials 3 on the edges of the periphery of the product preformed rough blank, folding the sealing film in half according to the edges of the product preformed rough blank, putting a vacuumizing air nozzle, and then bonding and sealing the sealing film by using a bonded sealing adhesive tape;
and 5: connecting a vacuum air pipe to the sealed product pre-molded rough blank, vacuumizing, and uniformly and orderly scraping out air bubbles in the product pre-molded rough blank by using a scraper plate;
step 6: putting the product pre-molded rough blank into a mold, and heating, pressurizing, curing and molding to obtain a product rough blank;
and 7: and curing the molded product rough blank, and machining the product into a product through CNC according to the overall dimension and the assembly requirement of the product.
7. The hand lay-up molding vacuum assisted forming mold of claim 6, wherein: the resin coated on the carbon fiber cloth in the step (3) is thermosetting resin.
8. The hand lay-up molding vacuum assisted forming mold of claim 7, wherein: the thermosetting resin is one or a mixture of epoxy resin, phenolic resin and vinyl resin.
9. The hand lay-up molding vacuum assisted forming mold of claim 6, wherein: the sealing film material is one or a mixture of PVC and EVA.
10. The hand lay-up molding vacuum assisted forming mold of claim 6, wherein: the temperature for heating and curing in the step (6) is 20-80 ℃, the time is 30-1440min, and the pressure is 10-800 Kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110219137.6A CN113021940A (en) | 2021-02-26 | 2021-02-26 | Hand-pasted die pressing vacuum auxiliary forming die and forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110219137.6A CN113021940A (en) | 2021-02-26 | 2021-02-26 | Hand-pasted die pressing vacuum auxiliary forming die and forming process |
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| CN113021940A true CN113021940A (en) | 2021-06-25 |
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| CN202110219137.6A Withdrawn CN113021940A (en) | 2021-02-26 | 2021-02-26 | Hand-pasted die pressing vacuum auxiliary forming die and forming process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102765198A (en) * | 2012-07-13 | 2012-11-07 | 中国人民解放军国防科学技术大学 | Vacuum assisted molding system of composite and molding method of composite |
| CN107225775A (en) * | 2016-03-25 | 2017-10-03 | 上海艾郎风电科技发展（集团）有限公司 | Hand pastes technique and the device for it |
| CN108297454A (en) * | 2017-04-25 | 2018-07-20 | 航天特种材料及工艺技术研究所 | A kind of polymer matrix composites, preparation method and vacuum bag used |
| CN210477869U (en) * | 2019-08-19 | 2020-05-08 | 山东三永新材料有限公司 | VAP membrane bag of bleeding |
-
2021
- 2021-02-26 CN CN202110219137.6A patent/CN113021940A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102765198A (en) * | 2012-07-13 | 2012-11-07 | 中国人民解放军国防科学技术大学 | Vacuum assisted molding system of composite and molding method of composite |
| CN107225775A (en) * | 2016-03-25 | 2017-10-03 | 上海艾郎风电科技发展（集团）有限公司 | Hand pastes technique and the device for it |
| CN108297454A (en) * | 2017-04-25 | 2018-07-20 | 航天特种材料及工艺技术研究所 | A kind of polymer matrix composites, preparation method and vacuum bag used |
| CN210477869U (en) * | 2019-08-19 | 2020-05-08 | 山东三永新材料有限公司 | VAP membrane bag of bleeding |
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Application publication date: 20210625 |
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