CN101571213B - Preparing method of bamboo fiber winding composite tube - Google Patents
Preparing method of bamboo fiber winding composite tube Download PDFInfo
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- CN101571213B CN101571213B CN2009100992792A CN200910099279A CN101571213B CN 101571213 B CN101571213 B CN 101571213B CN 2009100992792 A CN2009100992792 A CN 2009100992792A CN 200910099279 A CN200910099279 A CN 200910099279A CN 101571213 B CN101571213 B CN 101571213B
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Abstract
The invention discloses a preparing method of a bamboo fiber winding composite tube. The existing polyvinyl chloride tubes, polyethylene tubes, glass steel tubes and glass steel sand tubes consume a great amount of petroleum resources, and pollute environments. The invention provides the preparing method of the bamboo fiber winding composite tube. The preparing method comprises the following steps: preparing an inner liner layer; pre-treating bamboo fiber, connecting the bamboo fiber into a continuous bamboo fiber strip by a method of liner cloth adhesion or sewing or weaving, and rolling the bamboo fiber strip into a roll; preparing a reinforcing layer, installing the coiled bamboo fiber strip on a winding machine to unwind, coating resin on the bamboo fiber strip through a resin tank, winding the bamboo fiber strip on an inner liner layer of a straight tube mould more than two circles, and forming the reinforcing layer after curing; preparing an outer protective layer. The preparing method uses the winding machine to perform the machine production, so the production efficiency is high, the compactness of the bamboo fiber is enhanced, and the strength of the product is enhanced.
Description
Technical field
The present invention relates to the pipeline field, specifically a kind of preparation method who is applied to the bamboo fiber winding composite tube in the anticorrosion occasion of agricultural irrigation, water supply and sewage work and petrochemical industry.
Background technique
In water supply and sewage work and the anticorrosion occasion of petrochemical industry, used pipeline generally adopts polyvinyl chloride pipe, polyethylene pipe, Glass Steel Tube, glass reinforced plastic sand pipe etc. at present.Polyvinyl chloride pipe and polyethylene pipe light weight, smooth and corrosion-resistant, but deficiency and raw material are the composite of petroleum products to some extent rigidity and intensity aspect; Advantage corrosion-resistant, that intensity is high, fluid resistance is little, rigidity is big that Glass Steel Tube and glass reinforced plastic sand pipe have, but the reinforcing material of product is the glass fibre of high energy consumption, its used resin oil that places one's entire reliance upon, product and waste material are not recyclable, not environmental protection.Therefore use above-mentioned duct products, consumed the petroleum resources of a large amount of preciousnesses and caused environmental pollution.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists, a kind of preparation method of bamboo fiber winding composite tube is provided, and the bamboo fiber winding composite tube that it makes is under the prerequisite of proof strength and rigidity, save petroleum resources, reduce environmental pollution.
For this reason, the present invention adopts following technological scheme: the preparation method of bamboo fiber winding composite tube, bamboo fiber winding composite tube is along the caliber direction, be followed successively by inside liner, enhancement layer, external protection coating from inside to outside, inside liner, enhancement layer, external protection coating are bonded as one, and its preparation method may further comprise the steps:
1) preparation of inside liner: make liner with resin and felt on the straight tube mould, form the inside liner of antiseepage and inner wall smooth, used resin is selected anti-corrosion resin or food level resin etc. for use, and described felt is terylene felt or glass felt etc.;
2) bamboo fibre pretreatment: the bamboo fibre (generally being divided into bamboo silk, bamboo chip) that mao bamboon is split into long 2-6m, thick 0.5-3mm, wide 1-25mm, then the bamboo fibre of holding successfully being immersed mass concentration is in the NaOH solution of 1-10%, under 20-80 ℃, soak and carried out degreasing in 5-48 hour, clean then and drying, at last bamboo fibre is adopted lining cloth mode bonding or that sew up or weave to connect into a continuous bamboo fibre band, and be rolled into volume, use conveniently to be contained on the Stetch Wrapping Machine;
3) preparation of enhancement layer: the bamboo fibre band of rolling is contained in debatching on the Stetch Wrapping Machine, bamboo fibre band elder generation is by resin storage tank and coat resin, is wrapped in then on the inside liner of straight tube mould, twines more than two layers, to reach the thickness requirement of design, after solidifying, form enhancement layer;
4) preparation of external protection coating: outside enhancement layer, spray the anticorrosion water-proofing material of one deck, generally adopt modified urea-formaldehyde resin or polyurethane resin or vinyl ester resin or epoxy resin or phenolic resin or pitch, form external protection coating.
The present invention adopts the bamboo fibre band as reinforcing material, and non-glass fiber or carbon fiber etc., environmental protection and cost are low; Bamboo fibre is carried out dipping treatment, can improve toughness, reduce fragility; Adopt thermosetting resin as tackiness agent, can make between bamboo fibre and the bamboo fibre bonding goodly, give full play to its intensity; Owing to adopted the bamboo fibre band as reinforcing material in the enhancement layer, given advantages such as body light weight, high strength, high rigidity, high tenacity.After the present invention adopts continuous bamboo fibre band, the enhancement layer in the products obtained therefrom by one continuously the bamboo fibre band be entwined, can adopt Stetch Wrapping Machine to carry out mechanization production, improved the compactness between the bamboo fibre, and improved the intensity of product.
The preparation method of above-mentioned bamboo fiber winding composite tube, according to the different pressure rating of pipeline, rigidity requirement, adopt spiral winding or hoop winding or hoop to twine the different canoes such as combination that add the spiral winding respectively the bamboo fibre band is wrapped on the inside liner.The strength and stiffness of the bamboo fibre band that the canoe of employing combination obtains are better than single canoe.
The preparation method of above-mentioned bamboo fiber winding composite tube, the length of bamboo fibre band more than 50 meters (as long as production line do not stop, can endless), high efficiency when twining with assurance mechanization, the wide of bamboo fibre band is 3-50cm, according to the different bores of pipeline and the fiber band of winding process selection different in width.
The preparation method of above-mentioned bamboo fiber winding composite tube, used resin is a thermosetting resin in the resin storage tank, as urea formaldehyde resin or unsaturated polyester resin or epoxy resin or phenolic resin or polyurethane resin, solidifying temperature is 10-120 ℃.The urea formaldehyde resin that adopts non-petroleum product also can be saved petroleum resources as binder.
The preparation method of above-mentioned bamboo fiber winding composite tube, the resin of inside liner is selected anti-corrosion resin or food level resin for use, can select corresponding resin for use at the different application occasion.
The preparation method of above-mentioned bamboo fiber winding composite tube, the concrete making method of bamboo fibre band has as follows: 1) many bamboo fibres are arranged in parallel neatly, arrange along the longitudinal direction and line up band shape more, scribble the lining cloth of resin on the lining of the back side, form the bamboo fibre band; 2) many bamboo fibres are arranged in parallel neatly, arrange along the longitudinal direction and line up band shape more, every 20-40cm distance suture, it is vertical with the bamboo fibre band to sew up stitching at longitudinal direction, forms the bamboo fibre band; 3) intersect mutually with bamboo fibre and twine to form cross network and strengthen structure.Method 1) the bamboo fibre band of making is suitable for the bamboo fibre of thickness less than 1.2mm, is applied to small-bore pipeline morely; Method 2) and method 3) the bamboo fibre band made is suitable for thickness greater than the bamboo fibre more than the 1mm, is applied to bigbore pipeline morely.
The product that the present invention obtains is compared with polyvinyl chloride pipe, polyethylene pipe, has higher intensity, rigidity, has saved petroleum resources; Compare with Glass Steel Tube and glass reinforced plastic sand pipe, have similar strength and stiffness, it is lighter to compare matter, and cost is lower; Adopt Stetch Wrapping Machine to carry out mechanization production, the manufacturing efficiency height has improved the compactness between the bamboo fibre, and has improved the intensity of product; Reinforcing material is the renewable resources bamboo fibre of environmental protection, low energy consumption, and agricultural resource is developed.
Below in conjunction with specification drawings and specific embodiments the present invention is elaborated.
Description of drawings
The structural representation of the product that Fig. 1 makes for the present invention.
Fig. 2-7 is the structural representation of bamboo fibre band of the present invention.
Embodiment
Embodiment 1:
To make diameter is that the multiple pipe of bamboo of 200mm is an example, and concrete steps are as follows:
A) bamboo chip pretreatment:
Fresh mao bamboon is split into 5 meters long, that 0.7mm is thick, 10mm is wide bamboo chips, soaked 6 hours with 5%NaOH solution, water is rinsed well, after the drying, being arranged in parallel with 9 bamboo chips 11 neatly is a row, arrange many rows along the longitudinal direction successively, scribble the cotton yarn grid cloth 12 (60g/m of urea formaldehyde resin on the lining of the back side
2), solidified in 5 minutes through 120 ℃ of compactings, form the bamboo chip strap (see figure 2) of wide 90mm, thick 0.8mm, form the above continual bamboo chip strap that is as long as fifty meters, and be rolled onto on the reel stand-by;
B) preparation of inside liner 1:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 200mm, with the vinyl ester resin and the fiberglass surfacing mat (30g/m of antiseptic property excellence
2) making thickness reaches the inside liner of 2mm on the straight tube mould;
C) winding working procedure (being the preparation of enhancement layer 2):
After treating that inside liner solidifies, the bamboo chip strap of spooling in advance is wrapped on the Stetch Wrapping Machine, after the debatching of bamboo chip strap, immerse and soak into urea formaldehyde resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 1 layer of hoop/2 helical layers/1 layer hoop after, reach the design thickness of 6mm; After winding finishes, pipeline is heated to 60 ℃ solidified 20 minutes, after resin crosslinks is solidified, become the same with thermosetting compound material of hard one.
D) preparation of external protection coating 3:
At pipeline outside brushing one deck water-tight corrosion-proof epoxy resin preferably, thick about 0.5-1mm.
The pipeline that embodiment 1 produces is through hydraulic pressure test, and failure pressure reaches 5.2MPa in short-term, actual measurement total thickness 8.5mm, and rigidity reaches 16200N/m
2, hoop tension brute force reaches 520KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Real body material proportion is 0.87, is lower than 1.8～2.1 of Glass Steel Tube.
Embodiment 2:
To make diameter is that the multiple pipe of bamboo of 300mm is an example, and concrete steps are as follows:
A) bamboo chip pretreatment:
Fresh mao bamboon is split into 5 meters long, that 1.3mm is thick, 14mm is wide bamboo chips, soaked 8 hours for 60 ℃ with 8%NaOH solution, water is rinsed well, drying.Being arranged in parallel with 8 bamboo chips 21 is a row, arranges successively along the longitudinal direction and many rows sew up at longitudinal direction with stitching thread 22 on the distance of 30cm, sews up stitching and becomes vertical (see figure 3) with bamboo chip.Bamboo chip forms wide 120mm, thick 1.3mm, grows continual bamboo chip band more than 50 meters, and be rolled onto on the reel stand-by after sewing up;
B) preparation of inside liner:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 300mm, with food level resin and terylene surface felt (30g/m
2) making thickness reaches the inside liner of 2mm on the straight tube mould;
C) winding working procedure:
After treating that inside liner solidifies, the bamboo chip of spooling in advance is wrapped on the Stetch Wrapping Machine, after the debatching of bamboo chip band, immerse and soak into unsaturated polyester resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 1 layer of hoop/2 helical layers/1 layer hoop after, reach the design thickness of 8mm; After winding finished, the thick polyester film of the coated one deck 0.029mm of outermost made the body appearance smooth.Solidifying 60 minutes more than 20 ℃, after resin crosslinks is solidified, becoming the same with thermosetting compound material of hard one.
D) preparation of external protection coating:
At pipeline outside brushing one deck water-tight corrosion-proof vinyl ester resin preferably, thick about 0.5mm.
The pipeline that embodiment 2 produces is through hydraulic pressure test, and failure pressure reaches 4.6MPa in short-term, actual measurement total thickness 10.5mm, and actual measurement rigidity reaches 13200N/m
2, hoop tension brute force reaches 713KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Actual measurement body material proportion is 0.84, is lower than 1.8～2.1 of Glass Steel Tube.
Embodiment 3:
To make diameter is that the multiple pipe of bamboo of 300mm is an example, and concrete steps are as follows:
A) bamboo chip pretreatment:
Fresh mao bamboon is split into the bamboo chip that 140mm is long, 1.0mm is thick, 12mm is wide, soaked 6 hours with 5%NaOH solution, water is rinsed well, drying.Be woven into the wide bamboo mat band of 110mm with bamboo chip 31 cross one another modes, longitude and latitude bamboo chip and bamboo mat band are 45 ° angle (see figure 4) in this bamboo mat band.Bamboo mat tape thickness after the braiding is that 2mm, length surpass 50 meters continuous band-shaped, and is rolled onto on the reel stand-by;
B) preparation of inside liner:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 300mm, with food level resin and terylene surface felt (30g/m
2) making thickness reaches the inside liner of 2mm on pipe mold;
C) winding working procedure:
After treating that inside liner solidifies, the bamboo mat roll coil of strip of spooling in advance is contained on the Stetch Wrapping Machine, after the debatching of bamboo mat band, immerses infiltration urea formaldehyde resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 5 layers of hoop after, reach the design thickness of 10mm.Solidifying 30 minutes more than 60 ℃, after resin crosslinks is solidified, becoming the same with thermosetting compound material of hard one.
D) preparation of external protection coating:
At pipeline outside brushing one deck water-tight corrosion-proof polyurethane resin preferably, thick about 0.5mm.
The pipeline that embodiment 3 produces is through hydraulic pressure test, and failure pressure reaches 4.9MPa in short-term, actual measurement total thickness 12.2mm, and actual measurement rigidity reaches 42300N/m
2, hoop tension brute force reaches 735KN/m, and axially the tension brute force reaches 590KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Actual measurement body material proportion is 0.88, is lower than 1.8～2.1 of Glass Steel Tube.
Embodiment 4:
To make diameter is that the multiple pipe of bamboo of 200mm is an example, and concrete steps are as follows:
A) bamboo silk pretreatment:
Fresh mao bamboon is split into 5 meters long, 0.7mm is thick, 1.2mm is wide bamboo silk, soaked 5 hours with 5%NaOH solution, water is rinsed well, after the drying, bamboo silk 41 marshallings are become a row, arrange many rows along the longitudinal direction successively, scribble the cotton yarn grid cloth 42 (60g/m of urea formaldehyde resin on the lining of the back side
2), solidified in 5 minutes through 120 ℃ of compactings, form the bamboo silk strap (see figure 5) of wide 90mm, thick 0.8mm, form the above continual bamboo silk strap that is as long as fifty meters, and be rolled onto on the reel stand-by;
B) preparation of inside liner:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 200mm, with the vinyl ester resin and the fiberglass surfacing mat (30g/m of antiseptic property excellence
2) making thickness reaches the inside liner of 2mm on pipe mold;
C) winding working procedure:
After treating that inside liner solidifies, the bamboo silk strap of spooling in advance is wrapped on the Stetch Wrapping Machine, after the debatching of bamboo silk strap, immerse and soak into urea formaldehyde resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 1 layer of hoop/2 helical layers/1 layer hoop after, reach the design thickness of 5mm; After winding finishes, pipeline is heated to 60 ℃ solidified 20 minutes, after resin crosslinks is solidified, become the same with thermosetting compound material of hard one.
D) preparation of external protection coating:
At pipeline outside brushing one deck water-tight corrosion-proof epoxy resin preferably, thick about 0.5-1mm.
The pipeline that embodiment 4 produces is through hydraulic pressure test, and failure pressure reaches 4.8MPa in short-term, actual measurement total thickness 7.5mm, and rigidity reaches 14500N/m
2, hoop tension brute force reaches 480KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Real body material proportion is 0.86, is lower than 1.8～2.1 of Glass Steel Tube.
Embodiment 5:
To make diameter is that the multiple pipe of bamboo of 300mm is an example, and concrete steps are as follows:
A) bamboo silk pretreatment:
Fresh mao bamboon is split into 5 meters long, 1.2mm is wide, 1.2mm is thick bamboo silk, soaked 8 hours with 8%NaOH solution, water is rinsed well, drying.It is wide that bamboo silk 51 vertically is arranged in 110mm, arranges successively along the longitudinal direction and many rows sew up at longitudinal direction with stitching thread 52 on the distance of 30cm, sews up stitching and become vertical (see figure 6) with the bamboo silk.The bamboo silk forms wide 110mm, thick 1.3mm, grows continual bamboo silk ribbon more than 50 meters, and be rolled onto on the reel stand-by after sewing up;
B) preparation of inside liner:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 300mm, with food level resin and terylene surface felt (30g/m
2) making thickness reaches the inside liner of 2mm on the straight tube mould;
C) winding working procedure:
After treating that inside liner solidifies, the bamboo silk of spooling in advance is wrapped on the Stetch Wrapping Machine, after the debatching of bamboo silk ribbon, immerse and soak into unsaturated polyester resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 1 layer of hoop/2 helical layers/1 layer hoop after, reach the design thickness of 8mm; After winding finished, the thick polyester film of the coated one deck 0.029mm of outermost made the body appearance smooth.Solidified 60 minutes at 20 ℃, after resin crosslinks is solidified, become the same with thermosetting compound material of hard one.
D) preparation of external protection coating:
At pipeline outside brushing one deck water-tight corrosion-proof vinyl ester resin preferably, thick about 0.5mm.
The pipeline that embodiment 5 produces is through hydraulic pressure test, and failure pressure reaches 4.2MPa in short-term, actual measurement total thickness 10.5mm, and actual measurement rigidity reaches 12305N/m
2, hoop tension brute force reaches 651KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Actual measurement body material proportion is 0.84, is lower than 1.8～2.0 of Glass Steel Tube.
Embodiment 6:
To make diameter is that the multiple pipe of bamboo of 300mm is an example, and concrete steps are as follows:
A) bamboo silk pretreatment:
Fresh mao bamboon is split into the bamboo silk that 140mm is long, 1.0mm is wide, 1.0mm is thick, soaked 6 hours with 5%NaOH solution, water is rinsed well, drying.Be woven into the wide braid of 110mm with bamboo silk 61 cross one another modes, bamboo silk and bamboo silk braid are 60 ° angle (see figure 7) in this bamboo silk braid.Bamboo silk braid thickness after the braiding is that 2mm, length surpass 50 meters continuous band-shaped, and is rolled onto on the reel stand-by;
B) preparation of inside liner:
At external diameter is the thick polyester film of coating one deck 0.029mm on the steel straight tube mould of polishing of 300mm, with food level resin and terylene surface felt (30g/m
2) making thickness reaches the inside liner of 2mm on the straight tube mould;
C) winding working procedure:
After treating that inside liner solidifies, the bamboo silk braid of spooling in advance is wrapped on the Stetch Wrapping Machine, after the debatching of bamboo silk braid, immerses infiltration urea formaldehyde resin in the resin storage tank, entirely be wrapped in again on the straight tube mould, twine 5 layers of hoop after, reach the design thickness of 10mm.Solidifying 30 minutes more than 60 ℃, after resin crosslinks is solidified, becoming the same with thermosetting compound material of hard one.
D) preparation of external protection coating:
At pipeline outside brushing one deck water-tight corrosion-proof polyurethane resin preferably, thick about 0.5mm.
The pipeline that embodiment 6 produces is through hydraulic pressure test, and failure pressure reaches 4.0MPa in short-term, actual measurement total thickness 12.5mm, and actual measurement rigidity reaches 42510N/m
2, hoop tension brute force reaches 600KN/m, and axially the tension brute force reaches 520KN/m, is higher than PVC and polyethylene pipe, reaches the technical order of fiber reinforced plastic pipe.Actual measurement body material proportion is 0.89, is lower than 1.8～2.1 of Glass Steel Tube.
The above only is preferred embodiment of the present invention, is not technological scheme of the present invention is done any pro forma restriction.Every foundation essence of the present invention all falls within the scope of protection of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (6)
1. the preparation method of bamboo fiber winding composite tube, bamboo fiber winding composite tube is followed successively by inside liner, enhancement layer, external protection coating from inside to outside along the caliber direction, and its preparation method may further comprise the steps:
1) preparation of inside liner: on the straight tube mould, make liner, form the inside liner of antiseepage and inner wall smooth with resin and felt;
2) bamboo fibre pretreatment: mao bamboon is split into the bamboo fibre of long 2-6m, thick 0.5-3mm, wide 1-25mm, and then degreasing is cleaned and dry then, and last bamboo fibre adopts the mode of sewing up to connect into a continuous bamboo fibre band, and is rolled into volume; The concrete making method of bamboo fibre band is as follows: many bamboo fibres are arranged in parallel neatly, arrange along the longitudinal direction and line up band shape more, every 20-40cm distance suture, it is vertical with the bamboo fibre band to sew up stitching at longitudinal direction, forms the bamboo fibre band;
3) preparation of enhancement layer: the bamboo fibre band of rolling is contained in debatching on the Stetch Wrapping Machine, and bamboo fibre band elder generation is by resin storage tank and coat resin, is wrapped in then on the inside liner of straight tube mould, twines more than two layers, forms enhancement layer after solidifying;
4) preparation of external protection coating: outside enhancement layer, spray the anticorrosion waterproof materials of one deck, form external protection coating.
2. the preparation method of bamboo fiber winding composite tube according to claim 1 is characterized in that adopting spiral winding or hoop winding or hoop to twine the combination that adds the spiral winding bamboo fibre band is wrapped on the inside liner.
3. the preparation method of bamboo fiber winding composite tube according to claim 1 and 2, the length that it is characterized in that the bamboo fibre band is more than 50 meters, and is wide at 3-50cm.
4. the preparation method of bamboo fiber winding composite tube according to claim 1, it is characterized in that resin used in the resin storage tank is urea formaldehyde resin or unsaturated polyester resin or epoxy resin or phenolic resin or polyurethane resin, solidifying temperature is 10-120 ℃.
5. the preparation method of bamboo fiber winding composite tube according to claim 1 is characterized in that the resin of making inside liner selects anti-corrosion resin or food level resin for use.
6. the preparation method of bamboo fiber winding composite tube according to claim 1 is characterized in that skimming processes is as follows: it is in the NaOH solution of 1-10% that the bamboo fibre of holding successfully is immersed mass concentration, soaks 5-48 hour down at 20-80 ℃.
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| CN112477188A (en) * | 2020-10-27 | 2021-03-12 | 贵州昊华中意环保设备有限公司 | Control method of glass fiber reinforced plastic sand inclusion pipe winding machine |
| CN113007459A (en) * | 2021-02-25 | 2021-06-22 | 鑫竹海(福建)管道制造有限公司 | High-strength bamboo fiber wound composite pipe and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2069349U (en) * | 1990-03-13 | 1991-01-16 | 湖南省进出口总公司星竹公司 | Thin bamboo strips glued integrated pipe |
| CN1060259C (en) * | 1995-12-19 | 2001-01-03 | 陈克俭 | Bamboo woven reinforced composite pipe and shaping technology method |
| CN1324257C (en) * | 2005-08-05 | 2007-07-04 | 中国水利水电科学研究院 | Bamboo-plastic composite pipe shaping method |
| CN1962252A (en) * | 2005-11-11 | 2007-05-16 | 周弘 | Scaffold tube and preparation process thereof |
| AU2008202859B2 (en) * | 2007-06-29 | 2011-03-31 | 19 Dean Street Pty Ltd | Bamboo pipe for use as conduits for water/wastewater delivery |
| CN100500403C (en) * | 2007-09-19 | 2009-06-17 | 合肥工业大学 | Plastic-bamboo composite tube coiled forming technology method |
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