CN109986811A - A kind of preparation facilities and preparation method of fiber reinforced thermoplastic resin composite material - Google Patents
A kind of preparation facilities and preparation method of fiber reinforced thermoplastic resin composite material Download PDFInfo
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- CN109986811A CN109986811A CN201910282931.8A CN201910282931A CN109986811A CN 109986811 A CN109986811 A CN 109986811A CN 201910282931 A CN201910282931 A CN 201910282931A CN 109986811 A CN109986811 A CN 109986811A
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- fiber
- steeping vat
- section
- preparation facilities
- resin
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Classifications
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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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
-
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
-
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/526—Pultrusion dies, e.g. dies with moving or rotating parts
-
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/528—Heating or cooling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Reinforced Plastic Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses the preparation facilities and preparation method of a kind of fiber reinforced thermoplastic resin composite material, and wherein preparation facilities includes creel, surface processing trough, drying section, steeping vat, preforming tool, vacuum volatilization section, curing mold, cooling mold and traction device；The surface processing trough, steeping vat, preforming tool, vacuum volatilization section, curing mold and cooling mold are successively set between creel and traction device；Continuous fiber after steeping vat carries out dipping process is arranged and is exported according to preset molding hole by preforming tool；Vacuum volatilization section carries out volatilization processing to the organic solvent in the glue after steeping vat impregnation；Curing mold makes resin and continuous fiber curing molding by heating；Cooling mold cools down to molding composite material.Present invention process is simple, low for equipment requirements.Composite fiber and the resin dipping of preparation are good, and thoroughly, Interface adhesive strength is strong, shows good mechanical property for solvent volatilization.
Description
Technical field
The present invention relates to the preparation facilities and preparation method of a kind of fiber reinforced thermoplastic resin composite material, it belongs to fiber
Enhance thermoplastic composite and produces and processes technical field.
Background technique
In recent years, with the hair of fiber-reinforced resin matrix compound material (Fiber reinforced polymer, FRP)
Exhibition, FRP tendons present great application value in field of civil engineering.FRP tendons are high with intensity, density is small, corrosion resistance
The advantages that good, is widely used in substitution reinforcing bar enhancing concrete structure.Thermosetting FRP tendons have multiple successful cases using more.But
Its hard crisp, poor impact resistance, the curing molding period is long, high temperature resistant is poor, cannot carry out secondary operation, stirrup and curved muscle etc. at the scene
It can only be produced by prefabrication.And thermoplastic resin fusing point is compared with high, melt viscosity is big, and surface polarity is low, fiber is difficult to
Dipping, fiber is poor in conjunction with resin boundary surface, and production prepares extremely difficult.Currently, fiber reinforced thermoplastic resin common method is molten
Melt dipping, solution dipping, powder infusion etc..But when melt impregnation, high temperature easily causes fibre damage, resin decomposition；Powder infusion
Shi Yaoqiu fiber is dispersed into monofilament in the gas phase, and technical difficulty is big；When solution impregnates, part organic solvent is distributed in resin
Unevenly, it is wrapped in inside resin, resin viscosity is big, and organic solvent is difficult to volatilize completely, causes composite wood in preparation process
The defect of material.
The present invention prepares fibre-reinforced thermoplastic's muscle using solution dipping method pultrusion.First by surface processing trough to fibre
Dimension is surface-treated；Solvent is added in resin, steeping vat is evenly heated using far infrared plate radiation pre-heater, reduces tree
Rouge viscosity, while being stirred in impregnation trench bottom installation fan blade, it is ensured that resin and solvent are uniformly mixed；Pacify in steeping vat
1~5 roller is filled, extends dip time of the fiber in steeping vat, it is ensured that fiber is sufficiently impregnated in resin；By preforming
Mold makes fiber form constant cross-section.Fiber passes through vacuum volatilization section and keeps suitable temperature later, waves solvent maximization
It sends out and obvious aging is not caused to resin, reduce defect caused by volatilizing in resin and fiber formation process because of solvent, improve and draw
Extrude the mechanical property of product.
Summary of the invention:
The technical problem to be solved by the present invention is in view of the above-mentioned drawbacks of the prior art, and proposing a kind of fiber and increasing
The preparation facilities and method of heat-flash modeling resin composite materials.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
It include: creel, surface processing trough, drying section, steeping vat, preforming tool, vacuum volatilization section, curing mold, cold
But mold and traction device；The surface processing trough, steeping vat, preforming tool, vacuum volatilization section, curing mold and cold
But mold is successively set between creel and traction device；Continuous fiber is wound on the creel, continuous fiber is at surface
It is dried after being surface-treated in reason slot by drying section；Be provided in the steeping vat by resin and organic solvent mixing
Glue, the preforming tool arrange the continuous fiber after steeping vat carries out dipping process and defeated according to preset molding hole
Out；The vacuum volatilization section carries out volatilization processing to the organic solvent in the glue after the steeping vat impregnation；The solidification
Mold makes resin and continuous fiber curing molding by heating；The cooling mold cools down to molding composite material.
The surface treating agent for thering is fiber to be adapted in the surface processing trough；Continuous fiber by surface processing trough when
Between no less than 3min.
Roll coater, stirring blade and heating device are provided in the steeping vat；The heating device will be in steeping vat
Liquid is heated to 50-60 DEG C.
The heating device is the far infrared plate radiation pre-heater at impregnation trench bottom 5-10cm.
The volume ratio of resin and solvent is 100ml:3ml~10ml in the glue；The resin is polyethylene, poly- third
The thermoplastic resins such as alkene, polystyrene, polyether-ether-ketone, thermoplastic epoxy；The organic solvent is methyl ethyl ketone, acetone or dimethylbenzene.
The continuous fiber be glass fibre, basalt fibre, aramid fiber or any of the above two or three mix
Fiber.
The shape of molding hole is circle, rectangle, L shape or I-shaped steel type on the preforming mould；Solidify section die and pre-
Profiled section mould outlet cross sectional shape having the same.
Continuous fiber dip time in steeping vat is no less than 5min；Continuous fiber is many by the time in vacuum volatilization section
In 5min, it is not more than 10min, the vacuum volatilization section is always maintained at evacuated state, and is kept for 70-90 DEG C；Drying section temperature
Degree is between 60-80 DEG C, and time of the continuous fiber Jing Guo drying section is no less than 5min.
A kind of preparation method of fiber reinforced thermoplastic resin composite material, includes the following steps:
Fiber is surface-treated by surface processing trough, is then dried；
The dipping process in the steeping vat containing the mixed liquor mixed by resin and organic solvent；
It is preforming by preforming tool；
Organic solvent is volatilized in vacuum volatilization section；
By curing mold solidification, cooling mold cooling, it is prepared into composite material.
The hauling speed of pultrusion is 0.5-2.5m/min.
Present invention process is simple, low for equipment requirements.Dipping early period, fiber is surface-treated, improve its with
The binding performance of resin；There is far infrared plate radiation pre-heater at impregnation trench bottom 5-10cm, it is ensured that steeping vat thermally equivalent；?
Impregnation roller is housed in steeping vat, can effectively improve the steeping length of fiber, to improve pickling efficiency, it is empty to save equipment
Between；Stirring blade and storied placement are housed in steeping vat, can effectively agitating resin and organic solvent, both make mixing more equal
It is even；The use simultaneously of vacuum volatilization section vacuumizes and heating means can make solvent volatilization more thorough, while controlling the vacuum volatilization time,
The impregnation resin content for guaranteeing fiber prevents resin aging under long term high temperature effect.Thus device and method preparation composite material bar,
Tubing, plate etc. have good mechanical property.
Detailed description of the invention
The structural schematic diagram of Fig. 1 apparatus of the present invention；
The structural schematic diagram of Fig. 2 steeping vat；
Stirring blade arrangement schematic diagram in the horizontal plane in Fig. 3 steeping vat；
Fig. 4 preforming tool sectional view；A is circular muscle material section；B is the L-type material section of L-type；C is I-shaped work
Font material section；D is rectangular plate section.
Fig. 5 traction device structural schematic diagram.
Wherein: 1, creel；2, surface processing trough；3, drying section；4, steeping vat；41, roll coater；42, stirring blade；421,
Upper layer stirring blade；422, lower layer's stirring blade；43, heating device；5, preforming tool；51, molding hole；6, vacuum volatilization
Section；7, curing mold；8, cooling mold；9, traction device；91, upper Traction Drive band；92, lower Traction Drive band；10, continuous
Fiber.
Specific embodiment
The embodiment of the present invention is described below in detail, the embodiment is exemplary, it is intended to it is used to explain the present invention, and
It is not considered as limiting the invention.
As shown in Figure 1, the pultrusion preparation facilities of fiber reinforced thermoplastic resin composite material of the present invention, comprising: creel
1, surface processing trough 2, drying section 3, steeping vat 4, preforming tool 5, vacuum volatilization section 6, curing mold 7, cooling mold 8 and
Traction device 9.Surface processing trough 2, steeping vat 4, preforming tool 5, vacuum volatilization section 6, the tool of curing mold 7 and cooling mold 8
It is successively set between creel 1 and traction device 9.Continuous fiber 10 is wound on creel 1, continuous fiber 10 is in surface processing trough
It is dried after being surface-treated in 2 by drying section 3.Roll coater 41 and glue, the height of glue are provided in steeping vat
Cover some or all of roll coater 41.Glue is mixed by resin and organic solvent.The continuous fiber of drying section output is from leaching
The lower part of rubber roller 41 passes through, and carries out impregnation by roll coater 41.Preforming tool 5 arranges continuous fiber according to preset shape
Cloth simultaneously exports；Organic solvent in 6 pairs of the vacuum volatilization section glues after steeping vat impregnation carries out volatilization processing.Curing mold 7
Make resin and continuous fiber curing molding by heating；Cooling mold 8 cools down to molding composite material.
The surface treating agent for thering is fiber to be adapted in surface processing trough；Continuous fiber is many by the time of surface processing trough
In 3min.
The structure of steeping vat is as Figure 2-3, including roll coater 41, stirring blade 42 and heating device 43；Heating device
Liquid in steeping vat is heated to 50-60 DEG C by 43.In the present embodiment, heating device 43 is apart from impregnation trench bottom 5-10cm
The far infrared plate radiation pre-heater at place.
Stirring blade 42 includes upper layer stirring blade 421 and lower layer's stirring blade 422, and stirring blade 421 is at the middle and upper levels
A row placed in the middle in steeping vat.Lower layer's stirring blade 422 is two rows, is arranged on the two sides of steeping vat.Upper layer stirring blade 421
It is evenly arranged in overlook direction with lower layer stirring blade 422, namely two rows of four adjacent lower layer's stirring blades 422 are at pros
Shape arrangement, and upper layer stirring blade 421 is placed exactly in the center of square.Two layers of stirring that the present invention passes through above-mentioned arrangement
Blade can carry out sufficient uniform stirring to glue.
In the present embodiment, roll coater 41 is three, and is arranged at upper layer and lower layer, two of upper layer, one of lower layer.
The middle position positioned at upper layer of lower layer.Continuous fiber 10 is behind first roll coater upper surface on upper layer from lower layer's roll coater
Lower surface is finally gone out by the upper surface of the last one roll coater from steeping vat.
The volume ratio of resin and solvent is 100ml:3ml~10ml in glue；Resin is polyethylene, polypropylene, polyphenyl second
The thermoplastic resins such as alkene, polyether-ether-ketone, thermoplastic epoxy；Organic solvent is methyl ethyl ketone, acetone or dimethylbenzene.
Continuous fiber 10 be glass fibre, basalt fibre, aramid fiber or any of the above two or three mix fibre
Dimension.
The cross sectional shape of the molding hole of preforming tool 5 is shown in Figure 4, including round, rectangle or L shape or I-steel
Type etc..
Traction device 9 is the conventional design of this field, and structure as shown in Figure 5 can be used, i.e., by upper transmission belt 91 under
Transmission belt 92 is constituted, and the direction of motion of upper transmission belt 91 and lower transmission belt 92 is on the contrary, be located at upper transmission belt 91 under to drive
Moulding material among transmission belt 92 is moved synchronously with upper transmission belt 91 and lower transmission belt 92.
Embodiment 1
The preparation of continuous basalt fiber enhancing polyvinyl resin composite material bar
1, polyvinyl resin and acetone are placed in steeping vat after evenly mixing with volume ratio 100:8.The stirring of impregnation trench bottom
Blade and least significant end roller are 2cm, blade rotational speed 200r/min.It is preheated away from the radiation of far infrared plate is placed at impregnation trench bottom 5cm
Device is heated to 55 DEG C and keeps constant temperature.Continuous basalt fiber passes through steeping vat, volatilization section by traction device.Section of volatilizing is protected
Hold 85 DEG C of constant temperature.Then successively by curing mold curing molding, cooling mold cooling, pultrusion is at muscle.Hauling speed is 1m/
min。
2, the basalt fibre of this method preparation enhances polyvinyl resin composite material bar tensile strength 1300MPa, stretches
Modulus 56GPa meets engineering and uses needs.
Embodiment 2
The preparation of continuous basalt fiber enhancing thermo-plastic epoxy composite material bar
1, thermo-plastic epoxy and dimethylbenzene are placed in steeping vat after evenly mixing with volume ratio 100:5.Impregnation trench bottom
Stirring blade and least significant end roller are 2cm, blade rotational speed 100r/min.It is radiated away from far infrared plate is placed at impregnation trench bottom 5cm
Preheater is heated to 60 DEG C and keeps constant temperature.Continuous basalt fiber passes through steeping vat, volatilization section by traction device.Volatilization
Section keeps 90 DEG C of constant temperature.Then successively by curing mold curing molding, cooling mold cooling, pultrusion is at muscle.Hauling speed is
0.8m/min。
2, the basalt fibre of this method preparation enhances thermo-plastic epoxy composite material bar tensile strength 1450MPa, draws
Modulus 60GPa is stretched, meets engineering and uses needs.
Claims (10)
1. a kind of preparation facilities of fiber reinforced thermoplastic resin composite material, it is characterised in that: include: creel, surface processing trough,
Drying section, steeping vat, preforming tool, vacuum volatilization section, curing mold, cooling mold and traction device；At the surface
Reason slot, steeping vat, preforming tool, vacuum volatilization section, curing mold and cooling mold are successively set on creel and traction fills
Between setting；Wind continuous fiber on the creel, continuous fiber be surface-treated in surface processing trough after by drying
Section drying；It is provided in the steeping vat by the glue of resin and organic solvent mixing, the preforming tool will be through impregnation
Continuous fiber after slot progress dipping process is arranged and is exported according to preset molding hole；The vacuum volatilization section is to through the leaching
The organic solvent in glue after glue groove impregnation carries out volatilization processing；The curing mold makes resin and continuous fiber by heating
Curing molding；The cooling mold cools down to molding composite material.
2. preparation facilities according to claim 1, it is characterised in that: there is fiber to be adapted in the surface processing trough
Surface treating agent；Continuous fiber is no less than 3min by the time of surface processing trough.
3. preparation facilities according to claim 1, it is characterised in that: be provided with roll coater, stirring in the steeping vat
Blade and heating device；Liquid in steeping vat is heated to 50-60 DEG C by the heating device.
4. preparation facilities according to claim 3, it is characterised in that: the heating device is apart from impregnation trench bottom 5-
Far infrared plate radiation pre-heater at 10cm.
5. preparation facilities according to claim 1, it is characterised in that: the volume ratio of resin and solvent is in the glue
100ml:3ml ~ 10ml；The resin is polyethylene, polypropylene, polystyrene, polyether-ether-ketone or thermoplastic epoxy；It is described organic molten
Agent is methyl ethyl ketone, acetone or dimethylbenzene.
6. preparation facilities according to claim 1, it is characterised in that: the continuous fiber is glass fibre, basalt fibre
Dimension, aramid fiber or any of the above two or three assorted fibre.
7. preparation facilities according to claim 1, it is characterised in that: the shape of molding hole is circle on the preforming mould
Shape, rectangle, L shape or I-shaped steel type；Solidify section die and preforming section die exports cross sectional shape having the same.
8. preparation facilities according to claim 1, it is characterised in that: continuous fiber dip time in steeping vat is no less than
5min；Continuous fiber is no less than 5min by the time in vacuum volatilization section, is not more than 10min, and the vacuum volatilization section is protected always
Evacuated state is held, and is kept for 70-90 DEG C；Drying section temperature is time of the continuous fiber Jing Guo drying section between 60-80 DEG C
No less than 5min.
9. a kind of preparation method of fiber reinforced thermoplastic resin composite material, which is characterized in that use any institute of claim 1-8
Prepared by the preparation facilities stated, include the following steps:
Fiber is surface-treated by surface processing trough, is then dried；
The dipping process in the steeping vat containing the mixed liquor mixed by resin and organic solvent；
It is preforming by preforming tool；
Organic solvent is volatilized in vacuum volatilization section；
By curing mold solidification, cooling mold cooling, it is prepared into composite material.
10. preparation method according to claim 9, it is characterised in that: the hauling speed of traction device is 0.5-2.5m/
min。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910282931.8A CN109986811A (en) | 2019-04-10 | 2019-04-10 | A kind of preparation facilities and preparation method of fiber reinforced thermoplastic resin composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910282931.8A CN109986811A (en) | 2019-04-10 | 2019-04-10 | A kind of preparation facilities and preparation method of fiber reinforced thermoplastic resin composite material |
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| CN109986811A true CN109986811A (en) | 2019-07-09 |
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| CN201910282931.8A Pending CN109986811A (en) | 2019-04-10 | 2019-04-10 | A kind of preparation facilities and preparation method of fiber reinforced thermoplastic resin composite material |
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Cited By (4)
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| CN110712397A (en) * | 2019-09-12 | 2020-01-21 | 青岛中集创赢复合材料科技有限公司 | Composite board and continuous production system and continuous production method thereof |
| CN111391365A (en) * | 2020-03-27 | 2020-07-10 | 苏州市永盛防火材料有限公司 | Pultrusion process of glass fiber reinforced plastic sandwich plate |
| CN113478859A (en) * | 2021-05-26 | 2021-10-08 | 宁波市江北宏菱新兴绝缘材料有限公司 | Epoxy motor reinforcing ring apparatus for producing |
| CN114917686A (en) * | 2022-05-17 | 2022-08-19 | 苏州工业园区拓朴环保净化有限公司 | Preparation method of long fiber composite filter element, filter element and mold thereof |
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| CN105904611A (en) * | 2016-04-14 | 2016-08-31 | 北京航空航天大学 | Ultrathin continuous fiber reinforced thermoplastic resin prepreg and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110712397A (en) * | 2019-09-12 | 2020-01-21 | 青岛中集创赢复合材料科技有限公司 | Composite board and continuous production system and continuous production method thereof |
| CN111391365A (en) * | 2020-03-27 | 2020-07-10 | 苏州市永盛防火材料有限公司 | Pultrusion process of glass fiber reinforced plastic sandwich plate |
| CN113478859A (en) * | 2021-05-26 | 2021-10-08 | 宁波市江北宏菱新兴绝缘材料有限公司 | Epoxy motor reinforcing ring apparatus for producing |
| CN113478859B (en) * | 2021-05-26 | 2022-10-21 | 宁波市江北宏菱新兴绝缘材料有限公司 | Epoxy motor reinforcing ring apparatus for producing |
| CN114917686A (en) * | 2022-05-17 | 2022-08-19 | 苏州工业园区拓朴环保净化有限公司 | Preparation method of long fiber composite filter element, filter element and mold thereof |
| CN114917686B (en) * | 2022-05-17 | 2024-04-02 | 苏州工业园区拓朴环保净化有限公司 | Preparation method of long-fiber composite filter element, filter element and die thereof |
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Application publication date: 20190709 |