CN102219966A - Double-wall corrugated pipe produced by utilizing waste and old hard polyvinyl chloride (PVC) material and manufacturing method thereof - Google Patents
Double-wall corrugated pipe produced by utilizing waste and old hard polyvinyl chloride (PVC) material and manufacturing method thereof Download PDFInfo
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- CN102219966A CN102219966A CN2011101370426A CN201110137042A CN102219966A CN 102219966 A CN102219966 A CN 102219966A CN 2011101370426 A CN2011101370426 A CN 2011101370426A CN 201110137042 A CN201110137042 A CN 201110137042A CN 102219966 A CN102219966 A CN 102219966A
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Abstract
The invention discloses a double-wall corrugated pipe produced by utilizing a waste and old hard polyvinyl chloride (PVC) material. According to the intrinsic structural characteristic and extrinsic morphological characteristic of inner and outer walls of the double-wall corrugated pipe, the waste and old hard PVC is subjected to color sorting, so that the colored waste and old hard PVC is used for an inner layer, and carbon black is added into a raw material on an outer layer to meet the requirement that the inner wall of the double-wall corrugated pipe is colored, and the outer wall of the double-wall corrugated pipe is black; moreover, in order to reduce cost and improve performance, the calcium content of the waste and old hard PVC on inner and outer layers is studied, and the appropriate calcium content is selected to meet the requirement of reducing the cost and improving the performance. In addition, due to different structural performance of the inner and outer walls of the double-wall corrugated pipe, raw materials with different colors and raw materials with different grain diameters are discovered according to a large quantity of experiments, and different process parameters are used during production to meet the requirement of the structural performance of the inner and outer walls of the double-wall corrugated pipe.
Description
Technical field
The present invention relates to a kind of plastic conduit, particularly a kind of double-wall corrugated pipe and manufacture method thereof.
Background technology
Double-wall corrugated pipe is a kind of novel tube with ring texture outer wall and smooth internal walls, because advantages such as it has that the critical external compressive resistance ability is strong, construction costs is low, easy construction, coefficient of friction resistance low discharge are big, good low-temperature resistance, shock resistance and chemical stability are good are used widely at present.Its general polyethylene or new pvc material of adopting is made.
On the other hand, produce the enterprise of hard PVC goods, after finished product is made, there is a large amount of useless hard PVCs (tailing) to produce, the processing of useless hard PVC is difficulty very, number of patent application is that 2007100493282 Chinese patent has been reported the method that useless hard PVC is produced cable carbon recoil inserts pipe of using, though this method can well be utilized waste and old hard PVC, but the double-wall corrugated pipe that makes with this method, be difficult to reach the optimum performance requirement, also do not utilize waste and old hard PVC to produce the report of double-wall corrugated pipe at present.
Summary of the invention
Goal of the invention of the present invention is: at the problem of above-mentioned existence, provide a kind of double-wall corrugated pipe that utilizes waste and old hard PVC material to produce, and the method for producing this double-wall corrugated pipe is provided.
The technical solution used in the present invention is such: a kind of double-wall corrugated pipe that utilizes waste and old hard PVC material to produce, comprise internal layer and skin, and the raw material of described internal layer is made up of following component by mass percent:
Useless hard PVC powder 83～87%, chlorinatedpolyethylene 4.0～6.0%, composite lead heat stabilizer 1.35～1.65%, paraffin 0.27～0.33%, stearic acid 0.18～0.22%, tinting material 2.0～4.0%, auxiliary material A 3.35～6.5%, wherein, the calcium content of useless hard PVC powder is by mass ratio≤50%;
Described outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 82～86%, chlorinatedpolyethylene 4.0～6.0%, composite lead heat stabilizer 1.35～1.65%, paraffin 0.27～0.33%, stearic acid 0.18～0.22%, carbon black 3～5%, auxiliary material B 3.35～6.5%, wherein the calcium content of useless PVC powder is by mass ratio≤40%.
As preferably: the raw material of described internal layer is made up of following component by mass percent:
Useless hard PVC powder 85%, chlorinatedpolyethylene 5.0%, composite lead heat stabilizer 1.5%, paraffin 0.3%, stearic acid 0.2%, tinting material 3.0%, auxiliary material A 5.0%, wherein, the calcium content of useless hard PVC powder counts 50% by mass ratio;
Described outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 84%, chlorinatedpolyethylene 5.0%, composite lead heat stabilizer 1.5%, paraffin 0.3%, stearic acid 0.2%, carbon black 4%, auxiliary material B 5.0%, wherein the calcium content of useless hard PVC powder is by mass ratio 30%.
Judge the calcium content of the useless hard PVC material of screening according to the hardness of useless hard PVC material.
As preferably: described auxiliary material A is low molecular weight polyethylene wax 420P, and auxiliary material B is a rigid polyvinyl chloride.
As preferably: described internal layer adopts the hard PVC powder of the solid color except that black.
Utilize the manufacture method of the double-wall corrugated pipe of waste and old hard PVC material production, carry out according to following step:
(1) useless hard PVC is classified according to different colours and rejects wherein impurity, the useless hard PVC powder after the classification removal of impurities is pulverized respectively, be ground into≤particle of 10mm, particle is carried out abrasive dust, make the hard PVC powder that gives up;
(2) dispose internal layer and outer field starting material according to the above ratio respectively, obtain internal layer raw material and outer raw material, wherein, internal layer adopts the hard PVC powder of the solid color except that black;
(3) the internal layer raw material is dropped into mixing in the different mixing containers respectively with outer raw material, drop in the kneader respectively then and mediate, all mediate to temperature be 90～110 ℃, material after will mediating again respectively places a twin screw to melt extrude, in this process, the twin screw rotating speed of internal layer material is 20～40 rev/mins, barrel temperature is 144～175 ℃, and the twin screw rotating speed of outer material is 30～50 rev/mins, and barrel temperature is 149～180 ℃, material after melt extruding is through finalizing the design with a bite mould, die temperature is 160～180 ℃, and typing final vacuum sizing is again through cooling, the traction cutting, enlarging is rolled off the production line automatically.
As preferably: the useless hard PVC powder of internal layer directly is 50～100 orders, and outer useless hard PVC powder directly is 30～70 orders.
The present invention is according to the immanent structure feature and the external morphology feature of double-wall corrugated pipe outer wall and inwall, waste and old hard PVC has been carried out colour sorting, colored waste and old hard PVC is used for internal layer and adds carbon black at outer raw material, guaranteed double-wall corrugated the inside pipe wall coloured colors except that black such as (red, orange, yellow, green) indigo plants and outer wall is the needs of black, simultaneously, in order to improve the dispersion effect and the tinting strength of inwall raw material color, added an amount of low molecular weight polyethylene wax 420P as auxiliary material in internal layer raw material the inside; In addition,, study, selected suitable calcium content to satisfy the needs that reduce cost and improve performance for the calcium content of internal layer and outer field waste and old hard PVC in order to reduce cost and to improve performance; In addition, because the difference of double-wall corrugated pipe inside and outside wall structure properties, the present invention has found out the raw material of different colours kind and the raw material of different-grain diameter through a large amount of experiments, and when producing, adopt different processing parameters, to satisfy the needs of double-wall corrugated pipe inside and outside wall structure properties.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows: the present invention makes full use of waste and old hard PVC material, adopts serial of methods to make the double-wall corrugated pipe of excellent property, solve the problem that waste and old hard PVC material is recycled, helped environment protection; Simultaneously, reduce the production cost of double-wall corrugated pipe, improved the economical efficiency of enterprise.
Embodiment
Below in conjunction with embodiment, the present invention is done detailed explanation.
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Embodiment 1:
The waste and old hard PVC material of elder generation to reclaiming, comprise the tailing in the hard PVC material production process, reject impurity wherein, and carry out sorting according to different colours, simultaneously, carry out the classification of its calcium content according to the hardness of hard PVC material, the selection calcium content is 45%-50%, color is that blue waste and old hard PVC material is as the internal layer raw material, and pulverize and wear into 70 purpose hard PVC powder then, the selection calcium content is 35%-40%, select as remaining other versicolor waste and old hard PVC materials behind the internal layer raw material as outer raw material, and pulverize and wear into 50 purpose hard PVC powder then
Prepare burden then, wherein the starting material of internal layer are made up of following component by mass percent:
Useless hard PVC powder 85 kg, chlorinatedpolyethylene 5.0 kg, composite lead heat stabilizer 1.5 kg, paraffin 0.3 kg, stearic acid 0.2 kg, tinting material 3.0kg, low molecular weight polyethylene wax 420P 5.0 kg,
Outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 84 kg, chlorinatedpolyethylene 5.0 kg, composite lead heat stabilizer 1.5 kg, paraffin 0.3 kg, stearic acid 0.2 kg, carbon black 4 kg, rigid polyvinyl chloride 5.0 kg
Above-mentioned internal layer raw material is dropped into mixing in the different mixing containers respectively with outer raw material, drop in the kneader respectively then and mediate, all mediate to temperature be 100 ℃, material after will mediating again respectively places a twin screw to melt extrude, in this process, the twin screw rotating speed of internal layer material is 30 rev/mins, and barrel temperature is 160 ℃, and the twin screw rotating speed of outer material is 45 rev/mins, barrel temperature is 165 ℃, material after melt extruding is through finalizing the design with a bite mould, and die temperature is 170 ℃, typing final vacuum sizing, again through cooling, the traction cutting, enlarging is rolled off the production line automatically
The performance test results of the double-wall corrugated pipe that present embodiment obtains sees Table 1.
Embodiment 2:
The waste and old hard PVC material of elder generation to reclaiming, comprise the tailing in the hard PVC material production process, reject impurity wherein, and carry out sorting according to different colours, simultaneously, carry out the classification of its calcium content according to the hardness of hard PVC material, the selection calcium content is 40%-45%, color is that red waste and old hard PVC material is as the internal layer raw material, and pulverize and wear into 50 purpose hard PVC powder then, the selection calcium content is 30%-35%, select as remaining other versicolor waste and old hard PVC materials behind the internal layer raw material as outer raw material, and pulverize and wear into 30 purpose hard PVC powder then
Prepare burden then, wherein the starting material of internal layer are made up of following component by mass percent:
Useless hard PVC powder 83kg, chlorinatedpolyethylene 6kg, composite lead heat stabilizer 1.45kg, paraffin 0.33kg, stearic acid 0.22 kg, tinting material 2.0kg, low molecular weight polyethylene wax 420P 5.8 kg,
Outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 82%, chlorinatedpolyethylene 6 kg, composite lead heat stabilizer 1.45kg, paraffin 0.33 kg, stearic acid 0.22 kg, carbon black 4.2 kg, rigid polyvinyl chloride 5.8kg
Above-mentioned internal layer raw material is dropped into mixing in the different mixing containers respectively with outer raw material, drop in the kneader respectively then and mediate, all mediate to temperature be 90 ℃, material after will mediating again respectively places a twin screw to melt extrude, in this process, the twin screw rotating speed of internal layer material is 20 rev/mins, and barrel temperature is 144 ℃, and the twin screw rotating speed of outer material is 30 rev/mins, barrel temperature is 149 ℃, material after melt extruding is through finalizing the design with a bite mould, and die temperature is 160 ℃, typing final vacuum sizing, again through cooling, the traction cutting, enlarging is rolled off the production line automatically
The performance test results of the double-wall corrugated pipe that present embodiment obtains sees Table 2.
Embodiment 3:
The waste and old hard PVC material of elder generation to reclaiming, comprise the tailing in the hard PVC material production process, reject impurity wherein, and carry out sorting according to different colours, simultaneously, carry out the classification of its calcium content according to the hardness of hard PVC material, the selection calcium content is 45%-40%, color is that blue waste and old hard PVC material is as the internal layer raw material, and pulverize and wear into 100 purpose hard PVC powder then, the selection calcium content is 30%-35%, select as remaining other versicolor waste and old hard PVC materials behind the internal layer raw material as outer raw material, and pulverize and wear into 70 purpose hard PVC powder then
Prepare burden then, wherein the starting material of internal layer are made up of following component by mass percent:
Useless hard PVC powder 87 kg, chlorinatedpolyethylene 4.0 kg, composite lead heat stabilizer 1.4 kg, paraffin 0.27 kg, stearic acid 0.18 kg, tinting material 4.0kg, low molecular weight polyethylene wax 420P 5.0 kg,
Outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 86 kg, chlorinatedpolyethylene 4.0 kg, composite lead heat stabilizer 1.4 kg, paraffin 0.27 kg, stearic acid 0.18 kg, carbon black 4.65 kg, rigid polyvinyl chloride 3.6 kg
Above-mentioned internal layer raw material is dropped into mixing in the different mixing containers respectively with outer raw material, drop in the kneader respectively then and mediate, all mediate to temperature be 110 ℃, material after will mediating again respectively places a twin screw to melt extrude, in this process, the twin screw rotating speed of internal layer material is 40 rev/mins, and barrel temperature is 175 ℃, and the twin screw rotating speed of outer material is 50 rev/mins, barrel temperature is 180 ℃, material after melt extruding is through finalizing the design with a bite mould, and die temperature is 180 ℃, typing final vacuum sizing, again through cooling, the traction cutting, enlarging is rolled off the production line automatically
The performance test results of the double-wall corrugated pipe that present embodiment obtains sees Table 3.
Embodiment 4
The product of the foregoing description gained is according to polyethylene double-wall corrugated pipe (GB/T19472.1-2004) " and " burying the ground draining with first part of rigid polyvinyl chloride (PVC-U) structural walls pipeline system: double-wall corrugated pipe (GB/T18477.1-2007) "
Carry out quality examination, detected result is as follows
The detected result of table 1 embodiment 1
| ? | Test item | Standard | Detected result |
| 1 | Ring stiffness SN4 | ≥4 | 6.8 |
| 2 | Ring stiffness SN8 | ≥8 | 11．2 |
| 3 | Impact property | TIR≤10% | 6.5 |
| 4 | The ring flexibility | The sample slyness, no reverse bending, crack-free, two walls do not have disengagement | Meet |
| 5 | The creep ratio | ≤4% | 3.2% |
| 6 | Ultimate compression strength | ≥18MPa | 25 MPa |
The detected result of table 2 embodiment 2
| ? | Test item | Standard | Detected result |
| 1 | Ring stiffness SN4 | ≥4 | 5.9 |
| 2 | Ring stiffness SN8 | ≥8 | 10．2 |
| 3 | Impact property | TIR≤10% | 7.5 |
| 4 | The ring flexibility | The sample slyness, no reverse bending, crack-free, two walls do not have disengagement | Meet |
| 5 | The creep ratio | ≤4% | 3.5% |
| 6 | Ultimate compression strength | ≥18MPa | 23 MPa |
The detected result of table 3 embodiment 3
| ? | Test item | Standard | Detected result |
| 1 | Ring stiffness SN4 | ≥4 | 6.9 |
| 2 | Ring stiffness SN8 | ≥8 | 10．5 |
| 3 | Impact property | TIR≤10% | 8.3 |
| 4 | The ring flexibility | The sample slyness, no reverse bending, crack-free, two walls do not have disengagement | Meet |
| 5 | The creep ratio | ≤4% | 3.0% |
| 6 | Ultimate compression strength | ≥18MPa | 27 MPa |
Claims (6)
1. double-wall corrugated pipe that utilizes waste and old hard PVC material to produce, it is characterized in that: comprise internal layer and skin, the raw material of described internal layer is made up of following component by mass percent:
Useless hard PVC powder 83～87%, chlorinatedpolyethylene 4.0～6.0%, composite lead heat stabilizer 1.35～1.65%, paraffin 0.27～0.33%, stearic acid 0.18～0.22%, tinting material 2.0～4.0%, auxiliary material A 3.35～6.5%, wherein, the calcium content of useless hard PVC powder is by mass ratio≤50%;
Described outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 82～86%, chlorinatedpolyethylene 4.0～6.0%, composite lead heat stabilizer 1.35～1.65%, paraffin 0.27～0.33%, stearic acid 0.18～0.22%, carbon black 3～5%, auxiliary material B 3.35～6.5%, wherein the calcium content of useless PVC powder is by mass ratio≤40%.
2. the double-wall corrugated pipe that utilizes waste and old hard PVC material to produce according to claim 1, it is characterized in that: the raw material of described internal layer is made up of following component by mass percent:
Useless hard PVC powder 85%, chlorinatedpolyethylene 5.0%, composite lead heat stabilizer 1.5%, paraffin 0.3%, stearic acid 0.2%, tinting material 3.0%, auxiliary material A 5.0%, wherein, the calcium content of useless hard PVC powder counts 50% by mass ratio;
Described outer field raw material is made up of following component by mass percent:
Useless hard PVC powder 84%, chlorinatedpolyethylene 5.0%, composite lead heat stabilizer 1.5%, paraffin 0.3%, stearic acid 0.2%, carbon black 4%, auxiliary material B 5.0%, wherein the calcium content of useless hard PVC powder is by mass ratio 30%.
3. the double-wall corrugated pipe that utilizes waste and old hard PVC material to produce according to claim 1, it is characterized in that: described auxiliary material A is low molecular weight polyethylene wax 420P, and auxiliary material B is a rigid polyvinyl chloride.
4. the double-wall corrugated pipe that utilizes waste and old hard PVC material to produce according to claim 1 is characterized in that: described internal layer adopts the useless hard PVC powder of the solid color except that black.
5. any described manufacture method of utilizing the double-wall corrugated pipe that waste and old hard PVC material produces of a claim 1 to 4 is characterized in that:
(1) useless hard PVC is classified according to different colours and rejects wherein impurity, the useless hard PVC powder after the classification removal of impurities is pulverized respectively, be ground into≤particle of 10mm, particle is carried out abrasive dust, make the hard PVC powder that gives up;
(2) dispose internal layer and outer field starting material according to the above ratio respectively, obtain internal layer raw material and outer raw material, wherein, internal layer adopts the hard PVC powder of the solid color except that black;
(3) the internal layer raw material is dropped into mixing in the different mixing containers respectively with outer raw material, drop in the kneader respectively then and mediate, all mediate to temperature be 90～110 ℃, material after will mediating again respectively places a twin screw to melt extrude, in this process, the twin screw rotating speed of internal layer material is 20～40 rev/mins, barrel temperature is 144～175 ℃, and the twin screw rotating speed of outer material is 30～50 rev/mins, and barrel temperature is 149～180 ℃, material after melt extruding is through finalizing the design with a bite mould, die temperature is 160～180 ℃, and typing final vacuum sizing is again through cooling, the traction cutting, enlarging is rolled off the production line automatically.
6. the manufacture method of utilizing the double-wall corrugated pipe of waste and old hard PVC material production according to claim 5 is characterized in that: the useless hard PVC powder of internal layer directly is 50～100 orders, and outer useless hard PVC powder directly is 30～70 orders.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101370426A CN102219966B (en) | 2011-05-25 | 2011-05-25 | Double-wall corrugated pipe produced by utilizing waste and old hard polyvinyl chloride (PVC) material and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101370426A CN102219966B (en) | 2011-05-25 | 2011-05-25 | Double-wall corrugated pipe produced by utilizing waste and old hard polyvinyl chloride (PVC) material and manufacturing method thereof |
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| CN102219966A true CN102219966A (en) | 2011-10-19 |
| CN102219966B CN102219966B (en) | 2012-11-07 |
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| CN2011101370426A Expired - Fee Related CN102219966B (en) | 2011-05-25 | 2011-05-25 | Double-wall corrugated pipe produced by utilizing waste and old hard polyvinyl chloride (PVC) material and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102390118A (en) * | 2011-10-24 | 2012-03-28 | 广东联塑机器制造有限公司 | Production device and production method of three-wall corrugated pipe |
| CN103128977A (en) * | 2011-11-30 | 2013-06-05 | 广东联塑科技实业有限公司 | Keel molding process of polyvinyl chloride (PVC) pumping spiral pipe |
| CN103554773A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | Corrugated pipe containing sillimanite |
| CN103554774A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | Anti-leakage double-wall corrugated pipe |
| CN103554756A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | PVC (polyvinyl chloride) double-wall corrugated pipe |
| CN103786324A (en) * | 2014-01-22 | 2014-05-14 | 安徽大地工程管道有限公司 | Process for producing double-wall corrugated pipe |
| CN103982713A (en) * | 2014-05-09 | 2014-08-13 | 南安市华益塑胶制造有限公司 | Double-wall corrugated pipe modified by waste HDPE (high-density polyethylene) and manufacturing process of double-wall corrugated pipe |
| CN105348690A (en) * | 2015-11-30 | 2016-02-24 | 四川议中新材料股份有限公司 | Modified coal ash PVC composite corrugated pipe and preparation method thereof |
| CN105802094A (en) * | 2016-01-16 | 2016-07-27 | 福建和盛塑业有限公司 | Modified chlorinated polyvinyl chloride cable protective double-layer corrugated pipe and preparation method thereof |
| CN107057223A (en) * | 2017-04-28 | 2017-08-18 | 杭州波达塑料科技股份有限公司 | A kind of modified polyvinyl chloride double-wall corrugated pipe and its production technology |
| CN108948580A (en) * | 2018-06-27 | 2018-12-07 | 江苏诺贝尔塑业有限公司 | A kind of Double-wall PVC bellows and preparation method thereof |
| CN108976659A (en) * | 2018-06-27 | 2018-12-11 | 江苏诺贝尔塑业有限公司 | A kind of flame retardant type Double-wall PVC pipe and preparation method thereof |
| CN112679882A (en) * | 2020-12-24 | 2021-04-20 | 天津京通管道科技股份有限公司 | Production method of double-wall corrugated pipe |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390118A (en) * | 2011-10-24 | 2012-03-28 | 广东联塑机器制造有限公司 | Production device and production method of three-wall corrugated pipe |
| CN103128977A (en) * | 2011-11-30 | 2013-06-05 | 广东联塑科技实业有限公司 | Keel molding process of polyvinyl chloride (PVC) pumping spiral pipe |
| CN103554773A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | Corrugated pipe containing sillimanite |
| CN103554774A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | Anti-leakage double-wall corrugated pipe |
| CN103554756A (en) * | 2013-10-30 | 2014-02-05 | 安徽国通高新管业股份有限公司 | PVC (polyvinyl chloride) double-wall corrugated pipe |
| CN103786324A (en) * | 2014-01-22 | 2014-05-14 | 安徽大地工程管道有限公司 | Process for producing double-wall corrugated pipe |
| CN103982713A (en) * | 2014-05-09 | 2014-08-13 | 南安市华益塑胶制造有限公司 | Double-wall corrugated pipe modified by waste HDPE (high-density polyethylene) and manufacturing process of double-wall corrugated pipe |
| CN103982713B (en) * | 2014-05-09 | 2016-03-30 | 南安市华益塑胶制造有限公司 | A kind of manufacture craft utilizing waste HDPE modification double-wall corrugated pipe |
| CN105348690A (en) * | 2015-11-30 | 2016-02-24 | 四川议中新材料股份有限公司 | Modified coal ash PVC composite corrugated pipe and preparation method thereof |
| CN105802094A (en) * | 2016-01-16 | 2016-07-27 | 福建和盛塑业有限公司 | Modified chlorinated polyvinyl chloride cable protective double-layer corrugated pipe and preparation method thereof |
| CN107057223A (en) * | 2017-04-28 | 2017-08-18 | 杭州波达塑料科技股份有限公司 | A kind of modified polyvinyl chloride double-wall corrugated pipe and its production technology |
| CN108948580A (en) * | 2018-06-27 | 2018-12-07 | 江苏诺贝尔塑业有限公司 | A kind of Double-wall PVC bellows and preparation method thereof |
| CN108976659A (en) * | 2018-06-27 | 2018-12-11 | 江苏诺贝尔塑业有限公司 | A kind of flame retardant type Double-wall PVC pipe and preparation method thereof |
| CN112679882A (en) * | 2020-12-24 | 2021-04-20 | 天津京通管道科技股份有限公司 | Production method of double-wall corrugated pipe |
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