CN204358270U - A kind of multiply bellows - Google Patents
A kind of multiply bellows Download PDFInfo
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- CN204358270U CN204358270U CN201420786619.5U CN201420786619U CN204358270U CN 204358270 U CN204358270 U CN 204358270U CN 201420786619 U CN201420786619 U CN 201420786619U CN 204358270 U CN204358270 U CN 204358270U
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Abstract
The utility model relates to a kind of multiply bellows, and described multiply bellows comprise at least two-layer, and wherein have at least one deck to be aramid layer, described multiply bellows are extruding and moulding.The bellows at least comprising one deck aramid layer is passed through extruding and moulding by the utility model, the corrugated regions of this kind of multiply bellows can directly bend and there will not be extremely to discount and resemble, winding raod footpath can be adapted to well, even if after Long-Time Service, body still can keep good performance, decrease straight tube this road technique shaping, save cost of production; And these multiply bellows also can increase barrier layer, make it have the performance stoping corresponding gas or Liquid Penetrant or volatilization.
Description
Technical field
The utility model relates to Bellows Technology field, particularly relates to a kind of multiply bellows.
Background technique
The transport pipe of present passenger vehicle mostly is single or multiple lift polymer pipe, and fuel-steam delivery pipe mostly is single polymer layer bellows.For passenger vehicle transport pipe, the path walked due to gasoline line is relatively limited and fixing, so the more single and tortuous path in the path of pipeline road, according to straight tube, then need straight tube to be processed into the formed pipe meeting pathway requirements with multiple inflection point, processing technology is very loaded down with trivial details and not easily realize, and after use after a while, also probably there is rebound phenomenon through the inflection point of overmolding, cause the mutual interference between pipeline, affect usability, and for passenger vehicle fuel-steam conveyance conduit, the structural pipe wall intensity of common single polymer layer bellows, shock resistance, anticorrosive, resistance to infiltration, high-low temperature resistant alternation, the abilities such as dimensional stability are all poor, the demand of existing high performance vehicle can not be met, easily deform when running into the object collides such as stone, when using under because of season or motor long playing high/low temperature alternation situation, easily there is deterioration phenomenon, effectively can not prevent the infiltration of fuel oil and evaporant thereof, be difficult to reach higher osmotic-pressure-tolerant international standard requirement, and the easily environmental pollution problem because of the permeating volatile of fuel oil and evaporant thereof, in addition, the working life of body is also lower, be unfavorable for the overall usability improving vehicle.
Model utility content
The purpose of this utility model proposes a kind of multiply bellows, improves the overall performance of bellows as much as possible.
For achieving the above object, the utility model provides a kind of multiply bellows, and described multiply bellows comprise at least two-layer, and wherein have at least one deck to be aramid layer, described multiply bellows are extruding and moulding.
Further, described multiply bellows also comprise barrier layer, and described barrier layer can prevent from flowing through the gas of described multiply bellows or Liquid Penetrant or volatilization and go out.
Further, described multiply bellows also comprise adhesive layer, and described adhesive layer is used for the bonding between described aramid layer and described aramid layer, between described aramid layer and described barrier layer or between described barrier layer and described barrier layer.
Further, the material of described aramid layer is polyamide-11, polyamide-12, polyamide-6, polyamide-610 or polyamide-612.
Further, the material of described barrier layer is polycaprolactam, polybutylene-terephthalate, polypropylene, ethylene-vinyl alcohol copolymer, polyvinylidene fluoride, polyphenyl acid amides, ethylene-tetrafluoroethylene copolymer, high density polyethylene (HDPE) or polyamide-9T.
Further, described adhesive layer is Thermoplastic adhesive.
Further, described multiply bellows are double-layer structure, and its ectomesoderm is aramid layer, and internal layer is aramid layer or barrier layer.
Further, described multiply bellows every layer thickness is from outside to inside: outer: 0.3 ~ 0.9mm, internal layer: 0.1 ~ 0.5mm.
Further, described multiply bellows are three-decker, and its ectomesoderm is aramid layer, and mesosphere is adhesive layer or barrier layer, and internal layer is aramid layer, low precipitation layer or barrier layer.
Further, described multiply bellows every layer thickness is from outside to inside: outer: 0.3 ~ 0.8mm, mesosphere: 0.1 ~ 0.2mm, internal layer: 0.05 ~ 0.5mm.
Further, described multiply bellows are four-layer structure, and according to order from outside to inside, first layer is aramid layer, and the second layer is adhesive layer or barrier layer, and third layer is barrier layer or aramid layer, and the 4th layer is aramid layer or barrier layer.
Further, described multiply bellows every layer thickness is from outside to inside: first layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.2mm, third layer: 0.2 ~ 0.4mm, the 4th layer: 0.1 ~ 0.5mm.
Further, described multiply bellows are five-layer structure, according to order from outside to inside, first layer is aramid layer or low precipitation layer, the second layer is adhesive layer, third layer is barrier layer or aramid layer, and the 4th layer is adhesive layer or barrier layer, and layer 5 is aramid layer, low precipitation layer or barrier layer.
Further, described multiply bellows every layer thickness is from outside to inside: first layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.1mm, third layer: 0.1 ~ 0.3mm, the 4th layer: 0.05 ~ 0.1mm, and layer 5: 0.1 ~ 0.5mm.
Further, the innermost layer of described multiply bellows is conductive layer, and described conductive layer can prevent the accumulation of static electricity of medium when described multiply bellows inner high speed flowing.
Further, described multiply bellows also comprise low precipitation layer, and described low precipitation layer is arranged at innermost layer or the outermost surface of described multiply bellows, and described low precipitation layer can avoid the precipitation of oligomer in described multiply bellows.
Based on technique scheme, the bellows at least comprising one deck aramid layer is extruded by extruding form by the utility model, and this kind of multiply bellows can adapt to winding raod footpath well, decreases straight tube this road technique shaping, saves cost of production; Compared to singel-ply bellows, there is better performance, such as structural strength is larger, shock resistance, ability that is anticorrosive, high-low temperature resistant alternation are stronger, and these multiply bellows can also increase various barrier layer according to actual needs, make it have the performance stoping corresponding gas or Liquid Penetrant or volatilization.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, and form a application's part, schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the generalized section of the utility model multiply bellows embodiment.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the generalized section of another embodiment of the utility model multiply bellows.
Fig. 4 is the partial enlarged drawing of Fig. 3.
Fig. 5 is the generalized section of another embodiment of the utility model multiply bellows.
Fig. 6 is the partial enlarged drawing of Fig. 5.
Fig. 7 is the generalized section of another embodiment of the utility model multiply bellows.
Fig. 8 is the partial enlarged drawing of Fig. 7.
In figure: the two-layer bellows of a1-is outer, the two-layer bellows internal layer of a2-, b1-tri-layers of bellows skin, b2-tri-layers of bellows mesosphere, b3-tri-layers of bellows internal layer, c1-tetra-layers of bellows first layer, c2-tetra-layers of bellows second layer, c3-tetra-layers of bellows third layer, c4-tetra-layers of bellows the 4th layer, d1-five layers of bellows first layer, d2-five layers of bellows second layer, d3-five layers of bellows third layer, d4-five layers of bellows the 4th layer, d5-five layers of bellows layer 5.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technological scheme in embodiment is clearly and completely described.Obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it will be appreciated that, term " " center ", " transverse direction ", " longitudinal direction ", " front ", " afterwards ", " left side ", " right side ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore the restriction to the utility model protection domain can not be interpreted as.
As shown in Figure 1, be the generalized section of the utility model multiply bellows embodiment.Multiply bellows described in this comprise at least two-layer, and wherein have at least one deck to be aramid layer, described multiply bellows are extruding and moulding.
Multiply bellows of the present utility model can as compound oil transportation or fuel-steam bellows, the extrusion way adopted is that bellows is extruded, body is multi-layer co-extruded through multiple extruder, multiply bellows can be become again after corrugating machine is shaping, these multiply bellows are that one piece is extruded, the corrugated regions of this kind of pipeline can bend to any direction and there will not be extremely to discount and resemble, winding raod footpath can be adapted to well, even if after Long-Time Service, body still can keep good performance, and decrease straight tube this road technique shaping, save cost of production.Meanwhile, relative to singel-ply bellows of the prior art, multiply bellows of the present utility model are multi-layer compound structure, are a kind of flexible pipes, have better overall performance.Multiply bellows of the present utility model can also increase barrier layer, effectively prevent the infiltration of fuel oil and evaporant thereof, the structural strength of multiply bellows is larger, strong and the long service life of excellent shock resistance, anticorrosive, high-low temperature resistant alternation ability, can carry out the transportation work of gas or liquid as delivery line.
In one embodiment, described multiply bellows can also comprise barrier layer, and described barrier layer can prevent from flowing through the gas of described multiply bellows or Liquid Penetrant or volatilization and go out.
Multiply bellows of the present utility model can be according to actual needs, select corresponding barrier material, these multiply bellows are made to possess barrier property to specific gas or saturating, the anti-volatilization of liquid-impervious, these multiply bellows are applied on vehicle, fuel oil and evaporant thereof can be intercepted, play the effect of the discharge value reducing hydrocarbon; By adding more barrier layers, the performance simultaneously intercepting gas with various or Liquid Penetrant or volatilization can also be reached in addition.
In another embodiment, described multiply bellows also comprise adhesive layer, and described adhesive layer is used for the bonding between described aramid layer and described aramid layer, between described aramid layer and described barrier layer or between described barrier layer and described barrier layer.
Multiply bellows of the present utility model, can according to actual conditions need add adhesive layer, some multiply bellows needs to add adhesive layer, some does not then need to add adhesive layer, some needs add adhesive layer between aramid layer and aramid layer, some needs add adhesive layer between aramid layer and barrier layer, and the needs also had add adhesive layer between barrier layer and barrier layer.The interpolation of adhesive layer determines according to the self property of two adjacent layers, if can directly bond between two adjacent layers, then do not need to add adhesive layer again, and if two adjacent layers can not directly bond, then need add adhesive layer by both bondings.
Preferably, the material of described aramid layer can be polyamide-11, polyamide-12, polyamide-6, polyamide-610 or polyamide-612.
More preferably, the material of described barrier layer can be polycaprolactam, polybutylene-terephthalate, polypropylene, ethylene-vinyl alcohol copolymer, polyvinylidene fluoride, polyphenyl acid amides, ethylene-tetrafluoroethylene copolymer, high density polyethylene (HDPE) or polyamide-9T.
More preferably, described adhesive layer can be Thermoplastic adhesive, is the polymer material of copolymerization or homopolymerization.
In one embodiment, the innermost layer of described multiply bellows can be conductive layer, and described conductive layer can prevent the accumulation of static electricity of medium when described multiply bellows inner high speed flowing.Conductive layer, as the innermost layer of multiply bellows, can prevent fuel tank internal from causing blast due to accumulation of static electricity effectively.Wherein, the material of conductive layer as required, can select the conductive modified material that inner layer material is corresponding.
In another embodiment, described multiply bellows can also comprise low precipitation layer, and described low precipitation layer is arranged at innermost layer or the outermost surface of described multiply bellows, and described low precipitation layer can avoid the precipitation of oligomer in described multiply bellows.In the body of multiply bellows during circulation medium, low precipitation layer can be set at the innermost layer of multiply bellows, avoid causing pipeline blockage due to the precipitation of oligomer; When multiply bellows are placed in fuel tank, low precipitation layer can be set at the outermost surface of multiply bellows, avoid the oligomer in multiply bellows separate out and enter fuel tank pollution oil sources.Wherein, the material of low precipitation layer can select few even zero material of separating out of some precipitates such as high density polyethylene (HDPE), ethylene-tetrafluoroethylene copolymer, polyamide-9T.
Be illustrated the combination of the bellows of the utility model multiply bellows different layers table structure below, the implication representated by various material signs that wherein can relate to is:
PA11 polyamide-11
PA12 polyamide-12
PA6 polyamide-6
PA610 polyamide-610
PA612 polyamide-612
TIE adhesive layer
PA9T polyamide-9T (barrier layer)
EVOH ethylene-vinyl alcohol copolymer (barrier layer)
PVDF polyvinylidene fluoride (barrier layer)
PBT polybutylene-terephthalate (barrier layer)
ETFE ethylene-tetrafluoroethylene copolymer (barrier layer)
EFEP modification ETFE (barrier layer)
PP polypropylene
HDPE high density polyethylene (HDPE)
PPA polyphenyl acid amides.
This material of material representative hereinafter indicating con has electric conductivity.
As depicted in figs. 1 and 2, described multiply bellows are double-layer structure, and its ectomesoderm a1 is aramid layer, and internal layer a2 is aramid layer or barrier layer.
Such as, the material (from outside to inside) of two-layer bellows can be:
PA11/PA11con、
PA12/PA12con、
PA12/ETFE、
PA12/EFEP、
PA12/ETFEcon、
PA12/EFEPcon、
PA610/PPA、
PA12/PA9Tcon
Or PA12/PA9T.
In addition, the bellows of double-layer structure every layer thickness is from outside to inside preferably:
Outer: 0.3 ~ 0.9mm, internal layer: 0.1 ~ 0.5mm.
As shown in Figure 3 and Figure 4, described multiply bellows are three-decker, and its ectomesoderm b1 is aramid layer, and mesosphere b2 is adhesive layer or barrier layer, and internal layer b3 is aramid layer, low precipitation layer or barrier layer.
Such as, the material (from outside to inside) of three layers of bellows can be:
PA12/TIE/PA6、
PA11/TIE/PA11、
PA612/TIE/PP、
PA12/TIE/PP、
PA12/TIE/PBT、
PA12/EVOH/PA6、
PA612/TIE/HDPE、
PA6/TIE/HDPE、
PA12/PVDF/PA12、
PA12/PVDF/PA6、
PA12/ETFE/ETFEcon
Or PA12/PA9T/ETFE.
In addition, the bellows of three-decker every layer thickness is from outside to inside preferably:
Outer: 0.3 ~ 0.8mm, mesosphere: 0.1 ~ 0.2mm, internal layer: 0.05 ~ 0.5mm.
As shown in Figure 5 and Figure 6, described multiply bellows are four-layer structure, according to order from outside to inside, first layer c1 is aramid layer, second layer c2 is adhesive layer or barrier layer, and third layer c3 is barrier layer or aramid layer, and the 4th layer of c4 is aramid layer or barrier layer.
Such as, the material (from outside to inside) of four layers of bellows can be:
PA12/TIE/EVOH/PA6、
PA12/PVDF/PA12/PA12con
Or PA12/TIE/PA6/PA9T.
In addition, the bellows of four-layer structure every layer thickness is from outside to inside preferably:
First layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.2mm, third layer: 0.2 ~ 0.4mm, the 4th layer: 0.1 ~ 0.5mm.
As shown in Figure 7 and Figure 8, described multiply bellows are five-layer structure, according to order from outside to inside, first layer d1 is aramid layer or low precipitation layer, second layer d2 is adhesive layer, third layer d3 is barrier layer or aramid layer, and the 4th layer of d4 is adhesive layer or barrier layer, and layer 5 d5 is aramid layer, low precipitation layer or barrier layer.
Such as, the material (from outside to inside) of five layers of bellows can be:
PA12/TIE/EVOH/TIE/PA12、
PA12/TIE/EVOH/TIE/PA12con、
PA12/TIE/PA6/EVOH/PA6、
PA12/TIE/PVDF/TIE/PA12、
PA12/TIE/PVDF/TIE/PA12con、
PA12/TIE/EVOH/TIE/ETFE、
PA12/TIE/EVOH/TIE/EFEP、
PA12/TIE/EVOH/TIE/ETFEcon、
PA612/TIE/EVOH/TIE/HDPE、
PA12/TIE/EVOH/TIE/EFEPcon
Or PA12/TIE/PA6/PA9T/ETFE.
In addition, the bellows of five-layer structure every layer thickness is from outside to inside preferably:
First layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.1mm, third layer: 0.1 ~ 0.3mm, the 4th layer: 0.05 ~ 0.1mm, layer 5: 0.1 ~ 0.5mm.
In the various embodiments described above, the material of outermost aramid layer is polyamide-12, can certainly replace with polyamide-11, polyamide-6 or polyamide-612.
Certainly; for the Material selec-tion of aramid layer, barrier layer and adhesive layer just illustrating the utility model multiply bellows in the utility model; do not form restriction of the present utility model, adopt the structure with identical function of other materials formation within protection domain of the present utility model yet.
In sum, multiply bellows in the utility model adopt lamination layer structure, barrier layer can prevent the infiltration of fuel oil and evaporant thereof effectively, such as can by suitably selecting to make multiply bellows for biodiesel, methanol gasoline, ethanol vapor wet goods fuel oil and evaporant thereof have good barrier property, when if necessary, the two-layer barrier layer of complementation can be provided with in multiply bellows, such structure can the infiltration of a kind of pipe fitting resistant to many fuel oil and evaporant thereof, make the resistance to infiltration international standard usage requirement that product reaches higher, and the pollution to environment can be avoided because of the raising of osmotic-pressure-tolerant energy, meet environmental requirement.
Meanwhile, reasonably combined by material, the overall construction intensity of multiply bellows body can be strengthened greatly, therefore can obtain excellent shock resistance and anticorrosive, the high-low temperature resistant alternation ability of corresponding raising body and working life.
In addition, by material and the thickness of each layer of reasonable combination multiply bellows, such as the material of some layer is elected as and can reach the material of identical performance to low cost, then can reduce the overall price of product.
Multiply bellows of the present utility model, when using as vehicle oil transportation or fuel-steam pipe, can make the overall usability of vehicle be enhanced and improve.Except using as vehicle oil transportation or fuel-steam pipe, the conveyance conduit that also can be used as other liquid or gas uses.
By the explanation of the multiple embodiments to the utility model multiply bellows, can see the utility model multiply bellows embodiment at least have effectively can prevent that the infiltration of fuel oil and evaporant thereof, body overall construction intensity are high, excellent shock resistance, anticorrosive, high-low temperature resistant alternation ability is strong, cost of production is low and the advantage of long service life.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the field have been to be understood that: still can modify to embodiment of the present utility model or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technological scheme scope of the utility model request protection.
Claims (16)
1. multiply bellows, is characterized in that, described multiply bellows comprise at least two-layer, and wherein have at least one deck to be aramid layer, described multiply bellows are extruding and moulding.
2. multiply bellows according to claim 1, is characterized in that, described multiply bellows also comprise barrier layer, and described barrier layer can prevent from flowing through the gas of described multiply bellows or Liquid Penetrant or volatilization and go out.
3. multiply bellows according to claim 2, it is characterized in that, described multiply bellows also comprise adhesive layer, and described adhesive layer is used for the bonding between described aramid layer and described aramid layer, between described aramid layer and described barrier layer or between described barrier layer and described barrier layer.
4. multiply bellows according to claim 1, is characterized in that, the material of described aramid layer is polyamide-11, polyamide-12, polyamide-6, polyamide-610 or polyamide-612.
5. multiply bellows according to claim 2, it is characterized in that, the material of described barrier layer is polycaprolactam, polybutylene-terephthalate, polypropylene, ethylene-vinyl alcohol copolymer, polyvinylidene fluoride, polyphenyl acid amides, ethylene-tetrafluoroethylene copolymer, high density polyethylene (HDPE) or polyamide-9T.
6. multiply bellows according to claim 3, is characterized in that, described adhesive layer is Thermoplastic adhesive.
7. multiply bellows according to claim 2, is characterized in that, described multiply bellows are double-layer structure, and its ectomesoderm is aramid layer, and internal layer is aramid layer or barrier layer.
8. multiply bellows according to claim 7, is characterized in that, described multiply bellows every layer thickness is from outside to inside: outer: 0.3 ~ 0.9mm, internal layer: 0.1 ~ 0.5mm.
9. multiply bellows according to claim 3, is characterized in that, described multiply bellows are three-decker, and its ectomesoderm is aramid layer, and mesosphere is adhesive layer or barrier layer, and internal layer is aramid layer, low precipitation layer or barrier layer.
10. multiply bellows according to claim 9, is characterized in that, described multiply bellows every layer thickness is from outside to inside: outer: 0.3 ~ 0.8mm, mesosphere: 0.1 ~ 0.2mm, internal layer: 0.05 ~ 0.5mm.
11. multiply bellows according to claim 3, it is characterized in that, described multiply bellows are four-layer structure, according to order from outside to inside, first layer is aramid layer, the second layer is adhesive layer or barrier layer, and third layer is barrier layer or aramid layer, and the 4th layer is aramid layer or barrier layer.
12. multiply bellows according to claim 11, is characterized in that, described multiply bellows every layer thickness is from outside to inside: first layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.2mm, third layer: 0.2 ~ 0.4mm, the 4th layer: 0.1 ~ 0.5mm.
13. multiply bellows according to claim 3, it is characterized in that, described multiply bellows are five-layer structure, according to order from outside to inside, first layer is aramid layer or low precipitation layer, and the second layer is adhesive layer, and third layer is barrier layer or aramid layer, 4th layer is adhesive layer or barrier layer, and layer 5 is aramid layer, low precipitation layer or barrier layer.
14. multiply bellows according to claim 13, is characterized in that, described multiply bellows every layer thickness is from outside to inside: first layer: 0.3 ~ 0.5mm, the second layer: 0.05 ~ 0.1mm, third layer: 0.1 ~ 0.3mm, the 4th layer: 0.05 ~ 0.1mm, layer 5: 0.1 ~ 0.5mm.
15. multiply bellows according to claim 1, is characterized in that, the innermost layer of described multiply bellows is conductive layer, and described conductive layer can prevent the accumulation of static electricity of medium when described multiply bellows inner high speed flowing.
16. multiply bellows according to claim 1, it is characterized in that, described multiply bellows also comprise low precipitation layer, and described low precipitation layer is arranged at innermost layer or the outermost surface of described multiply bellows, and described low precipitation layer can avoid the precipitation of oligomer in described multiply bellows.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299333A (en) * | 2015-11-30 | 2016-02-03 | 河北亚大汽车塑料制品有限公司 | Multilayer pipe |
| CN106009756A (en) * | 2016-05-27 | 2016-10-12 | 江苏洁润管业有限公司 | Double-wall corrugated pipe and producing process thereof |
| CN107022160A (en) * | 2017-05-15 | 2017-08-08 | 南通曙光机电工程有限公司 | A kind of compound type corrugated pipe |
| CN114508632A (en) * | 2022-03-09 | 2022-05-17 | 河北亚大汽车塑料制品有限公司 | High-flame-retardance multilayer fuel pipe and preparation method thereof |
-
2014
- 2014-12-15 CN CN201420786619.5U patent/CN204358270U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299333A (en) * | 2015-11-30 | 2016-02-03 | 河北亚大汽车塑料制品有限公司 | Multilayer pipe |
| CN106009756A (en) * | 2016-05-27 | 2016-10-12 | 江苏洁润管业有限公司 | Double-wall corrugated pipe and producing process thereof |
| CN107022160A (en) * | 2017-05-15 | 2017-08-08 | 南通曙光机电工程有限公司 | A kind of compound type corrugated pipe |
| CN114508632A (en) * | 2022-03-09 | 2022-05-17 | 河北亚大汽车塑料制品有限公司 | High-flame-retardance multilayer fuel pipe and preparation method thereof |
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