CN105156772A - Winding pipe with fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall and machining process for winding pipe - Google Patents
Winding pipe with fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall and machining process for winding pipe Download PDFInfo
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- CN105156772A CN105156772A CN201510443318.1A CN201510443318A CN105156772A CN 105156772 A CN105156772 A CN 105156772A CN 201510443318 A CN201510443318 A CN 201510443318A CN 105156772 A CN105156772 A CN 105156772A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention discloses a winding pipe with a fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall. The winding pipe is divided into FRPP inner layers, high-density polyethylene (HDPE) tube outer layers and HDPE adhesion layers, wherein each FRPP inner layer and the corresponding HDPE tube outer layer form a square unit tube together, and the square unit tubes are bonded together through the HDPE adhesion layers to form the whole winding pipe. According to the design of the winding pipe, on the one hand, the ring stiffness of the tubes is improved through the high-elasticity modulus of the FRPP material, on the other hand, the ring flexibility of the tubes is maintained through the toughness of the HDPE; besides, by means of the rapidly cooling crystallization property of the HDPE material, the square unit tubes of the hollow structures can be formed rapidly, the stability of the forming process for the tubes is guaranteed, and the product performance is reliable; for another, the usage of the raw materials can be lowered, the proportion of the FRPP material in the raw materials is increased, meanwhile, the product mass is reduced, and transportation is convenient; according to the winding pipe, the production process is simple and easy to implement, and production of the winding pipe of the large diameter can be achieved.
Description
Technical field
The present invention relates to a kind of enhancing entwining tube, particularly relate to a kind of FRPP and strengthen hollow structure wall winding tube and processing technology thereof.
Background technique
Along with China's rapid economic development, the especially continuous expansion of urban size, the demand of especially bigbore entwining tube is more and more prosperous.Traditional cement pipe or steel pipe due to himself defect, as cement pipe rapid wear, quality weight, the tube quality defect and less and lessly to use in municipal drainage pipeline such as heavily.
And traditional entwining tube adopts the pipe structure of waviness due to it, pipeline possesses certain bending properties, but is single armed solid tubes due to it, and raw-material consumption is large, and cost is high.
The utility model patent " a kind of FRPP high strength riffled tube " of application number 201120300711.2 discloses a kind of Double wound pipe using FRPP material as stiffening rib, because its whole tubing is still solid, its weight is still heavier, compared with traditional entwining tube, difference is little, and the use amount of FRPP material is also lower.
Summary of the invention
The object of the present invention is to provide a kind of raw material dosage few, product hardness is high, lightweight, and the FRPP that cost is low strengthens hollow structure wall winding tube and processing technology thereof.
A kind of FRPP strengthens hollow structure wall winding tube, and described entwining tube is divided into FRPP internal layer, HDPE outer tube layer and HDPE adhering layer.
Wherein, FRPP internal layer by following component and weight percentage formulated: fiberglass reinforced PP:100 ~ 200 part, functional master batch: 50 ~ 100 parts, defoamer 5 ~ 15 parts.
HDPE outer tube layer by following component and weight percentage formulated: HDPE raw material: 50 ~ 150 parts, PE hot melt adhesive: 5 ~ 15 parts, black masterbatch: 1 ~ 4 part.
HDPE adhering layer by following component and weight percentage formulated: HDPE raw material: 100 ~ 200 parts, fiberglass reinforced PE:20 ~ 30 part, PE hot melt adhesive: 10 ~ 30 parts, defoamer: 5 ~ 15 parts; Black masterbatch: 3 ~ 7 parts.
The model that described fiberglass reinforced PP is is PP-GF10; Described functional master batch is 75%PE resin, 20% calcium carbonate and talcous composite powder, 5% auxiliary agent carry out mix and blend granulation products obtained therefrom; The model of described HDPE raw material is CRP100N or PN049 or N3000 or GC100S or 041; The model of described fiberglass reinforced PE is PE-GF20; Described defoamer is polysiloxane defoamers or polyethers defoamer or higher alcohols.
Described FRPP internal layer is wrapped up by HDPE outer tube layer, common composition rectangular cells pipe fitting; Connected by HDPE adhering layer between described rectangular cells pipe fitting.
Described FRPP internal layer is square tubulose or round tubular or oval tubular; Described HDPE outer tube layer is square tubulose.
A kind of FRPP strengthens the preparation method of hollow structure wall winding tube, comprise the steps: that (a) FRPP internal layer is extruded: by 100 ~ 200 parts of fiberglass reinforced PP, 50 ~ 100 parts of functional master batch, 5 ~ 15 parts of defoamers are mixed by batch mixing stirrer, extruded by Single screw extrusion equipment again, when extruding, barrel zone temperature is 180 ~ 200 DEG C, and die head temperature is 185 ~ 205 DEG C, obtains FRPP internal layer.
B () HDPE outer tube layer is extruded: by 50 ~ 150 parts of HDPE raw materials, 5 ~ 15 parts of PE hot melt adhesive, 1 ~ 4 part of black masterbatch is mixed by mixing and blending machine, extruded by the outside of Single screw extrusion equipment in step (a) gained FRPP internal layer, when extruding, barrel zone temperature is 170 ~ 190 DEG C, the temperature of the die head of extrusion equipment is 170 ~ 190 DEG C, obtains rectangular cells pipe fitting.
C the winding of () rectangular cells pipe fitting is extruded with HDPE adhering layer: be wound around by the carrying out of step (b) rectangular cells pipe fitting along the winding guide pillar of Wiring apparatus, between rectangular cells pipe fitting, Clearance Between Wound is even, and adopt hot blast to dry rifle by the gap oven dry between rectangular cells pipe fitting, and by 100 ~ 200 parts of HDPE raw materials, 20 ~ 30 parts of fiberglass reinforced PE, 10 ~ 30 parts of PE hot melt adhesive, 5 ~ 15 parts of defoamers, after 3 ~ 7 parts of black masterbatch are uniformly mixed, adopt Single screw extrusion equipment, barrel zone temperature is 190 ~ 210 DEG C, die head temperature is 210 ~ 230 DEG C, aforementioned mixed material is extruded between rectangular cells pipe fitting gap, obtain " I " shape adhesive layer, realize limit to be wound around, while extrude HDPE adhering layer, according to speed of wrap, the entwining tube that adhesion is good is extruded winding guide pillar simultaneously.
D () cutting section: by the entwining tube of step (c) gained through excessive long cutting, obtains FRPP and strengthens hollow structure wall winding tube straight tube.
The gap that described rectangular cells pipe fitting is wound around along winding guide pillar is 1 ~ 10mm.
Successional between each step of described step (a), step (b), step (c), step (d).
Beneficial effect of the present invention is.
1, by adding the hollow bar shaped pipe of FRPP as stiffening rib in entwining tube tubing, not only can reduce raw-material consumption, increasing the ratio of FRPP material in raw material, alleviating quality of product simultaneously, convenient transport, reduces the cost of raw material.
2, this twisted pipe production process is simple and easy to do, the production of large diameter wound pipe can be realized simultaneously, in bigbore entwining tube production process, new requirement is not had to extrusion equipment, only entwining tube need be extruded using square tubular as unit, namely the production of the entwining tube of different bore all only need change the winding guide pillar of different-diameter.
3, this twisted pipe production process realizes shaping from FRPP internal layer to entwining tube, and whole process is all continuous prodution, and automation technolo degree is high, and equipment requirement is low, reduces labour demand largely simultaneously, overallly reduces labor cost.
Accompanying drawing explanation
Fig. 1, entwining tube longitudinal section.
Fig. 2, rectangular cells pipe fitting sectional view.
Illustrate in figure:
1, HDPE outer tube layer; 2, FRPP internal layer; 3, HDPE adhering layer.
Embodiment
A kind of FRPP strengthens hollow structure wall winding tube, as shown in Figure 1 and 2, is made up of HDPE outer tube layer 1, FRPP internal layer 2 and HDPE adhering layer 3.
Embodiment 1.
Select 100kg model to be fiberglass reinforced PP, 50kg model of PP-GF10 to be the functional master batch of KT-570 type, 5kg defoamer carries out mix and blend, Single screw extrusion equipment is adopted to carry out extruding square square hole FRPP internal layer, Single screw extrusion equipment barrel zone temperature is set to 180 DEG C, and die head temperature is set to 185 DEG C.
Select that 50kg model is the HDPE raw material of CRP100N, 5kgPE hot melt adhesive, 1kg black masterbatch carry out mix and blend, Single screw extrusion equipment is adopted to extrude HDPE outer tube layer in above-mentioned square square hole FRPP internal layer surrounding, the two common composition rectangular cells pipe fitting, wherein Single screw extrusion equipment barrel zone temperature is 170 DEG C, and die head temperature is 170 DEG C.
Embodiment 2.
With embodiment 1, its difference is that described model be the fiberglass reinforced pp of pp-gf10 is 150kg, and described model is the functional master batch of KT-570 type is 75kg, and described defoamer is 10kg, the Single screw extrusion equipment barrel zone temperature of described FRPP internal layer is 190 DEG C, and die head temperature is 195 DEG C; Described model is the HDPE raw material of CRP100N is 100kg, and described PE hot melt adhesive is 10kg, and described black masterbatch is 2.5kg, and the barrel zone temperature of the outer field extrusion equipment of described HDPE is 180 DEG C, and die head temperature is 180 DEG C.
Embodiment 3.
With embodiment 1 or 2, its difference is, described model is the fiberglass reinforced pp of pp-gf10 is 200kg, described model is the functional master batch of KT-570 type is 100kg, described defoamer is 15kg, and the Single screw extrusion equipment barrel zone temperature of described FRPP internal layer is 200 DEG C, and die head temperature is 205 DEG C; Described model is the HDPE raw material of CRP100N is 150kg, and described PE hot melt adhesive is 15kg, and described black masterbatch is 4kg, and the barrel zone temperature of the outer field extrusion equipment of described HDPE is 190 DEG C, and die head temperature is 190 DEG C.
Embodiment 4.
Embodiment 1 ~ 3 gained rectangular cells pipe fitting is wound around in the winding post of 0.5m diameter, winding is spaced apart 1cm, winding limit, limit bonds to Clearance Between Wound, the HDPE raw material of the constituent that the material of adhesive layer is to be 100kg model be CRP100N, 20kg model are the fiberglass reinforced PE of PE-GF20, the PE hot melt adhesive of 10kg, 5kg defoamer, the black masterbatch of 3kg carries out mix and blend, and adopt Single screw extrusion equipment to extrude winding interval, the barrel zone temperature of Single screw extrusion equipment is set to 190 DEG C, and die head temperature is set to 210 DEG C.In extrusion process, Single screw extrusion equipment is fixing, and entwining tube adhesion limit in limit in adhesion process is extruded, and the speed of wrap of extruded velocity and entwining tube is harmonious, remains to aim to be wound around interval with the extrusion outlet of bonding screw extruder.Corresponding embodiment 1 ~ 3 will be distinguished according to the present embodiment gained tubing called after A1, B1, C1.
Embodiment 5.
With embodiment 4, its difference is, the HDPE raw material of the material of described adhering layer to be 150kg model be CRP100N, 25kg model are the fiberglass reinforced PE of PE-GF20, the PE hot melt adhesive of 20kg, 10kg defoamer, the black masterbatch of 5kg carries out mix and blend, and described Single screw extrusion equipment barrel zone temperature is 200 DEG C, and die head temperature is 220 DEG C.Corresponding embodiment 1 ~ 3 will be distinguished according to the present embodiment gained tubing called after A2, B2, C2.
Embodiment 6.
With embodiment 4, its difference is, the HDPE raw material of the material of described adhering layer to be 200kg model be CRP100N, 30kg model are the fiberglass reinforced PE of PE-GF20, the PE hot melt adhesive of 30kg, 15kg defoamer, the black masterbatch of 7kg carries out mix and blend, and described Single screw extrusion equipment barrel zone temperature is 210 DEG C, and die head temperature is 230 DEG C.Corresponding embodiment 1 ~ 3 will be distinguished according to the present embodiment gained tubing called after A3, B3, C3.
Embodiment 7.
By the long cutting of the amount of carrying out respectively of embodiment 4 ~ 6 gained entwining tube, every root pipe length is decided to be 4m.
Embodiment 8.
Entwining tube A1, A2, A3, B1, B2, B3, C1, C2, C3 of embodiment 5 ~ 7 gained are carried out respectively the detection of physical property and mechanical property according to GB/T19472.2-2004.
(1) wherein physics characteristic mainly detects tubing longitudinal welds, and wherein the testing result of the longitudinal welds of each entwining tube is as follows:
| Entwining tube is numbered | A1 | A2 | A3 | B1 | B2 | B3 | C1 | C2 | C3 |
| Longitudinal welds (%) | 2.21 | 2.34 | 2.27 | 2.01 | 1.87 | 1.98 | 2.13 | 2.09 | 2.17 |
Note: aforementioned tubes does not all occur layering and cracking phenomena in testing process.
(2) tensile strength of the main detection ring rigidity of mechanical property, impact property, ring flexibility, seam.
By the detection of These parameters, the properties that a kind of FRPP of the present invention strengthens hollow structure wall winding tube is up to standard, meet NBS, and the quality of entwining tube corresponding to the present invention and traditional wound pipe is light, the raw-material application of HDPE is less, adds the consumption of FRPP material simultaneously, in addition the much middle many apertures of tubing, further decrease the consumption of material, larger has saved cost.In production technology, this method is applicable to producing bigbore entwining tube, and does not have high requirement to equipment, and the diameter specifications that only need be wound around guide pillar can reach requirement, does not need to upgrade to extrusion equipment.
The foregoing is only embodiments of the invention; not thereby scope of patent protection of the present invention is limited; every utilize specification of the present invention and accompanying drawing content thereof to do equivalent structure or equivalence transformation; or direct or indirect other association areas used beyond the present invention, all can be considered in scope of patent protection of the present invention.
Claims (7)
1. FRPP strengthens a hollow structure wall winding tube, it is characterized in that: described entwining tube is divided into FRPP internal layer, HDPE outer tube layer and HDPE adhering layer;
Wherein, FRPP internal layer by following component and weight percentage formulated: fiberglass reinforced PP:100 ~ 200 part, functional master batch: 50 ~ 100 parts, defoamer 5 ~ 15 parts;
HDPE outer tube layer by following component and weight percentage formulated: HDPE raw material: 50 ~ 150 parts, PE hot melt adhesive: 5 ~ 15 parts, black masterbatch: 1 ~ 4 part;
HDPE adhering layer by following component and weight percentage formulated: HDPE raw material: 100 ~ 200 parts, fiberglass reinforced PE:20 ~ 30 part, PE hot melt adhesive: 10 ~ 30 parts, defoamer: 5 ~ 15 parts; Black masterbatch: 3 ~ 7 parts.
2. a kind of FRPP strengthens hollow structure wall winding tube according to claim 1, it is characterized in that: the model that described fiberglass reinforced PP is is PP-GF10; Described functional master batch is 75%PE resin, 20% calcium carbonate and talcous composite powder, 5% auxiliary agent carry out mix and blend granulation products obtained therefrom; The model of described HDPE raw material is CRP100N or PN049 or N3000 or GC100S or 041; The model of described fiberglass reinforced PE is PE-GF20; Described defoamer is polysiloxane defoamers or polyethers defoamer or higher alcohols.
3. a kind of FRPP strengthens hollow structure wall winding tube according to claim 1, it is characterized in that: described FRPP internal layer is wrapped up by HDPE outer tube layer, common composition rectangular cells pipe fitting; Connected by HDPE adhering layer between described rectangular cells pipe fitting.
4. a kind of FRPP strengthens hollow structure wall winding tube according to claim 1, it is characterized in that: described FRPP internal layer is square tubulose or round tubular or oval tubular; Described HDPE outer tube layer is square tubulose.
5. the preparation method of entwining tube as claimed in claim 1, is characterized in that: comprise the steps:
A () FRPP internal layer is extruded: by 100 ~ 200 parts of fiberglass reinforced PP, 50 ~ 100 parts of functional master batch, 5 ~ 15 parts of defoamers are mixed by batch mixing stirrer, extruded by Single screw extrusion equipment again, when extruding, barrel zone temperature is 180 ~ 200 DEG C, die head temperature is 185 ~ 205 DEG C, obtains FRPP internal layer;
B () HDPE outer tube layer is extruded: by 50 ~ 150 parts of HDPE raw materials, 5 ~ 15 parts of PE hot melt adhesive, 1 ~ 4 part of black masterbatch is mixed by mixing and blending machine, extruded by the outside of Single screw extrusion equipment in step (a) gained FRPP internal layer, when extruding, barrel zone temperature is 170 ~ 190 DEG C, the temperature of the die head of extrusion equipment is 170 ~ 190 DEG C, obtains rectangular cells pipe fitting;
C the winding of () rectangular cells pipe fitting is extruded with HDPE adhering layer: be wound around by the carrying out of step (b) rectangular cells pipe fitting along the winding guide pillar of Wiring apparatus, between rectangular cells pipe fitting, Clearance Between Wound is even, and adopt hot blast baking rifle to extrude between square folk prescription shape unit pipe fitting gap, obtain " I " shape adhesive layer, realize limit to be wound around, while extrude HDPE adhering layer, according to speed of wrap, the entwining tube that adhesion is good is extruded winding guide pillar simultaneously;
D () cutting section: by the entwining tube of step (c) gained through excessive long cutting, obtains FRPP and strengthens hollow structure wall winding tube straight tube.
6. the preparation method of entwining tube according to claim 5, is characterized in that: described rectangular cells pipe fitting is 1 ~ 10mm along being wound around the gap that guide pillar is wound around.
7. the preparation method of entwining tube according to claim 5, is characterized in that: be successional between each step of described step (a), step (b), step (c), step (d).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443318.1A CN105156772A (en) | 2015-07-27 | 2015-07-27 | Winding pipe with fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall and machining process for winding pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443318.1A CN105156772A (en) | 2015-07-27 | 2015-07-27 | Winding pipe with fiber reinforced polypropylene (FRPP) reinforced hollow-structure wall and machining process for winding pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254087A (en) * | 2017-05-08 | 2017-10-17 | 重庆金山洋生管道有限公司 | One kind enhancing composite polyethylene binary wall twisting and pipe and preparation method thereof |
| CN108481622A (en) * | 2018-04-02 | 2018-09-04 | 王慧丽 | A kind of PP hollow spiral tubes waste recovery systems |
| CN111022781A (en) * | 2019-12-05 | 2020-04-17 | 杭州坦科机械科技有限公司 | Glass fiber reinforced plastic pipeline with hollow wall structure and manufacturing process thereof |
| CN111361123A (en) * | 2020-03-20 | 2020-07-03 | 重庆金山洋生管道有限公司 | Winding processing method of large-caliber FRPP (reinforced polypropylene) reinforced pipe |
| CN111536324A (en) * | 2020-06-08 | 2020-08-14 | 史先锋 | Double-wall hollow winding pipe and preparation method thereof |
| CN112248397A (en) * | 2020-09-30 | 2021-01-22 | 陕西飞天管业科技有限公司 | Hollow wall winding pipe and preparation process thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107254087A (en) * | 2017-05-08 | 2017-10-17 | 重庆金山洋生管道有限公司 | One kind enhancing composite polyethylene binary wall twisting and pipe and preparation method thereof |
| CN108481622A (en) * | 2018-04-02 | 2018-09-04 | 王慧丽 | A kind of PP hollow spiral tubes waste recovery systems |
| CN111022781A (en) * | 2019-12-05 | 2020-04-17 | 杭州坦科机械科技有限公司 | Glass fiber reinforced plastic pipeline with hollow wall structure and manufacturing process thereof |
| CN111022781B (en) * | 2019-12-05 | 2021-08-17 | 杭州坦科机械科技有限公司 | Glass fiber reinforced plastic pipeline with hollow wall structure and manufacturing process thereof |
| CN111361123A (en) * | 2020-03-20 | 2020-07-03 | 重庆金山洋生管道有限公司 | Winding processing method of large-caliber FRPP (reinforced polypropylene) reinforced pipe |
| CN111536324A (en) * | 2020-06-08 | 2020-08-14 | 史先锋 | Double-wall hollow winding pipe and preparation method thereof |
| CN112248397A (en) * | 2020-09-30 | 2021-01-22 | 陕西飞天管业科技有限公司 | Hollow wall winding pipe and preparation process thereof |
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Application publication date: 20151216 |