CN102606813A - Hollow-wall steel-plastic composite winding pipe and manufacturing method thereof - Google Patents
Hollow-wall steel-plastic composite winding pipe and manufacturing method thereof Download PDFInfo
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- CN102606813A CN102606813A CN2012100677662A CN201210067766A CN102606813A CN 102606813 A CN102606813 A CN 102606813A CN 2012100677662 A CN2012100677662 A CN 2012100677662A CN 201210067766 A CN201210067766 A CN 201210067766A CN 102606813 A CN102606813 A CN 102606813A
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Abstract
The invention provides a hollow-wall steel-plastic composite winding pipe and a manufacturing method of the hollow-wall steel-plastic composite winding pipe. The hollow-wall steel-plastic composite winding pipe comprises a pipe body, wherein a composite pipe with a spiral structure is arranged in the pipe wall of the pipe body; the composite pipe comprises a steel pipe and a plastic pipe; the plastic pipe is coated outside the steel pipe; filling plastic is arranged in a gap which are formed by the composite pipe; and the filling plastic and the plastic pipe are hot melted to be an integral structure. The hollow-wall steel-plastic composite winding pipe provided has the advantages that when spiral winding process is carried out on the composite pipe, the steel pipe can be bent easily; as the cross section of the steel pipe is of an enclosed structure, the twist deformation of the steel pipe is effectively decreased, and the difficulty in processing the hollow-wall steel-plastic composite winding pipe is reduced; moreover, the elastic modulus and the strength of steels are much greater than those of plastics, and smaller wall thickness can be adopted to the composite pipe under the same condition, therefore, the raw material of the composite pipe can be saved by more than 50% than that of a common plastic winding pipe, and the manufacturing cost of the hollow-wall winding pipe is effectively reduced.
Description
Technical field
The present invention relates to the composite pipe technical field, relate in particular to a kind of hollow wall steel plastic composite wound pipe and production method thereof.
Background technique
At present; Steel-plastic composite pipe is widely used in drainage pipe; Steel-plastic composite pipe is common to adopt following technology to process: the polyethylene wallboard of extruding formation is processed through twining formation technology with the steel band as outer wall; Adopting above-mentioned processing technology will form inwall is that plastic tube, outer wall are the steel-plastic composite pipe of steel belt layer, and in order to strengthen the structural strength of steel-plastic composite pipe, the cross section of steel band is set to inverted T-shaped structure, trapezium structure or W shape type structure usually.By on can know that because steel band is polymorphic structure, the difficulty of processing of steel band is big, is wrapped in the process of plastic tube at steel band, occurs the steel band torsional deformation easily, causes steel-plastic composite pipe difficulty of processing of the prior art big, manufacture cost is high, and inwall is weak.
Summary of the invention
The present invention provides a kind of hollow wall steel plastic composite wound pipe and production method thereof; Big in order to solve steel-plastic composite pipe difficulty of processing of the prior art; Manufacture cost is high; Inwall realizes reducing the difficulty of processing of hollow wall steel plastic composite wound pipe than defectives such as weaknesses, improves the reliability of hollow wall steel plastic composite wound pipe.
The present invention provides a kind of hollow wall steel plastic composite wound pipe; Comprise body; Be provided with the composite pipe of helix structure in the tube wall of said body, said composite pipe comprises steel pipe and plastic tube, and said plastic tube is coated on outside the said steel pipe; Be provided with filled plastics in the gap that said composite pipe forms, said filled plastics and said plastic tube hot melt are overall structure.
Aforesaid hollow wall steel plastic composite wound pipe, said filled plastics form the inner and outer wall of said tube wall.
Aforesaid hollow wall steel plastic composite wound pipe also is provided with heat-fusing glue layer between said steel pipe and the said plastic tube.
Aforesaid hollow wall steel plastic composite wound pipe, said body also are wound with plastic tape outward.
Aforesaid hollow wall steel plastic composite wound pipe, said plastic tube and said filled plastics are processed for the PE material, and said plastic tape is processed for the PP material.
Aforesaid hollow wall steel plastic composite wound pipe, the cross section of said steel pipe are circle or rectangle or ellipse.
Hollow wall steel plastic composite wound pipe provided by the invention; Form the tube wall of body through the composite pipe of helix structure; And in the gap that composite pipe forms, be provided with filled plastics; Filled plastics are overall structure with the composite pipe hot melt of helix structure, and the steel pipe in the composite pipe is wrapped in the plastic tube fully, have avoided occurring the phenomenon that plastic tube and steel pipe break away from; Carry out spiral when twine handling at composite pipe, steel pipe can be bent more easily, because the cross section of steel pipe is an enclosed construction, effectively reduces and the steel pipe distortion that is distorted occurs, and has reduced the difficulty of processing of hollow wall steel plastic composite wound pipe; And; Because big many of the Young's modulus of steel and strength ratio plastics, under the same conditions, composite pipe can use littler wall thickness; Thereby can save the raw material more than 50% than common plastics entwining tube, effectively reduce the manufacture cost of hollow wall entwining tube.In addition; Wrapped by plastic tube because steel pipe is outer; And the plastic tube in the composite pipe of helix structure through the filled plastics hot melt together; The outer wall of hollow wall steel plastic composite wound pipe is more level and smooth, makes the hollow wall steel plastic composite wound pipe both can be used for water vent and can be used for supplying water, and has widened the application area of hollow wall steel plastic composite wound pipe.
The present invention provides a kind of production method of aforesaid hollow wall steel plastic composite wound pipe, comprising:
Step 1, outside steel pipe, coat plastic tube, form composite pipe;
Step 2, composite pipe is carried out the composite pipe that spiral twine to handle forms helix structure, and in the formed gap of the composite pipe of helix structure, fill the molten state plastics to form filled plastics through Wiring apparatus.
Aforesaid hollow wall steel plastic composite wound pipe production method, step 2 is specially: through Wiring apparatus composite pipe is carried out spiral and twine, and in the formed gap of the composite pipe of helix structure, fill the molten state plastics to form filled plastics; Simultaneously, in the composite pipe outer felt of helix structure around plastic tape.
Aforesaid hollow wall steel plastic composite wound pipe production method, before step 1, said hollow wall steel plastic composite wound pipe production method also comprises:
Step 1a, employing PUR coat steel pipe, on steel pipe, to form heat-fusing glue layer;
Step 1 is specially: outside heat-fusing glue layer, coat plastic tube.
Aforesaid hollow wall steel plastic composite wound pipe production method, after step 2, said hollow wall steel plastic composite wound pipe production method also comprises:
Step 3, carry out fixed length cutting and handle.
Hollow wall steel plastic composite wound pipe production method provided by the invention; Form composite pipe through coating plastic pipe on steel pipe; Then composite pipe is carried out spiral and twine to handle, simultaneously the molten state plastics are injected in the gap that the composite pipe of helix structure forms, the molten state plastics of high temperature are integral adjacent plastic tube hot melt; Because steel pipe is wrapped in the plastic tube fully, avoided occurring the phenomenon that plastic tube and steel pipe break away from; When composite pipe carries out spiral winding processing; Steel pipe can be bent more easily; And because the cross section of steel pipe is an enclosed construction; Effectively reduce and the steel pipe distortion that is distorted occurs, reduced the difficulty of processing of hollow wall steel plastic composite wound pipe through hollow wall steel plastic composite wound pipe production method; And; Because big many of the Young's modulus of steel and strength ratio plastics, under the same conditions, composite pipe can use littler wall thickness; Thereby can save the raw material more than 50% than common plastics entwining tube, effectively reduce the manufacture cost of hollow wall entwining tube.In addition; Wrapped by plastic tube because steel pipe is outer; And the plastic tube after the spiral winding is handled merges through the molten state plastics of high temperature; The outer wall of hollow wall steel plastic composite wound pipe is more level and smooth, makes the hollow wall steel plastic composite wound pipe both can be used for water vent and can be used for supplying water, and has widened the application area of hollow wall steel plastic composite wound pipe.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technological scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is hollow wall steel plastic composite wound pipe embodiment's of the present invention structural representation;
Fig. 2 is the local enlarged diagram of a-quadrant among Fig. 1;
Fig. 3 is the structural representation of composite pipe among the hollow wall steel plastic composite wound pipe embodiment of the present invention;
Fig. 4 is hollow wall steel plastic composite wound pipe production method embodiment's of the present invention processing schematic representation;
Fig. 5 is the local enlarged diagram in B zone among Fig. 4.
Embodiment
For the purpose, technological scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technological scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiments.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment who is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is hollow wall steel plastic composite wound pipe embodiment's of the present invention structural representation; Fig. 2 is the local enlarged diagram of a-quadrant among Fig. 1; Fig. 3 is the structural representation of composite pipe among the hollow wall steel plastic composite wound pipe embodiment of the present invention.Like Fig. 1-shown in Figure 3; Present embodiment hollow wall steel plastic composite wound pipe comprises body, is provided with the composite pipe 10 of helix structure in the tube wall of body; Composite pipe 10 comprises steel pipe 1 and plastic tube 2; Plastic tube 2 is coated on outside the steel pipe 1, is provided with filled plastics 3 in the gap 101 that composite pipe 10 forms, and filled plastics 3 are overall structure with plastic tube 2 hot melts.
Particularly; The tube wall of present embodiment hollow wall steel plastic composite wound pipe is provided with the composite pipe 10 of helix structure; The gap 101 that the composite pipe 10 of helix structure forms is filled with filled plastics 3; And filled plastics 3 are overall structure with plastic tube 2 hot melts, through filled plastics 3 steel pipe 1 outer plastic tube 2 are connected into overall structure.Because the employing steel pipe 1 in the composite pipe 10; Composite pipe 10 can be easy to twine the formation helix structure through Wiring apparatus; And because the cross section of steel pipe 1 is an enclosed construction, composite pipe 10 can effectively be avoided steel pipe 1 distortion that is distorted in winding process; Avoided adopting the steel band of polymorphic structure to twine processing difficulties and occurred the generation of the phenomenon of steel band torsional deformation easily, effectively reduced the difficulty of processing of present embodiment hollow wall steel plastic composite wound pipe with Wiring apparatus.In addition; Because the tube wall major part of present embodiment hollow wall steel plastic composite wound pipe is occupied by steel pipe 1; Only needing in the gap 101 that composite pipe 10 forms, to fill a spot of filled plastics 3 is that an overall structure just can with plastic tube 2 hot melts; Therefore the amount of the filled plastics 3 of present embodiment hollow wall steel plastic composite wound pipe use is very little, can save filled plastics 3 use amounts more than 50%, greatly reduces the manufacture cost of present embodiment hollow wall steel plastic composite wound pipe.Preferably, for the inside and outside wall that makes tube wall in the hollow wall steel plastic composite wound pipe is more level and smooth, the filled plastics 3 in the present embodiment form the inner and outer wall of tube wall.Twine in the process of processing through Wiring apparatus at composite pipe 10; Through injecting the plastics of molten state in the gap 101 that forms to composite pipe 10; The plastics that are melted attitude in the gap 101 are filled up; After moulding of molten state cooled off formation filled plastics 3, filled plastics 3 will form level and smooth inner and outer wall, supply water and draining thereby present embodiment hollow wall steel plastic composite wound pipe can be used in.
Further, in order to make the steel pipe 1 and plastic tube 2 more firm linking together in the composite pipe 10, also be provided with heat-fusing glue layer 3 between steel pipe 1 in the present embodiment and the plastic tube 2.Concrete, through between steel pipe 1 and plastic tube 2, heat-fusing glue layer 3 being set, heat-fusing glue layer 3 can be with steel pipe 1 and plastic tube 2 more firm linking together.
Further, for the outer wall of the tube wall that makes present embodiment hollow wall steel plastic composite wound pipe is more level and smooth, the body in the present embodiment is outer can also to be wound with plastic tape 4.Concrete, through winding plastic band 4 body outside, plastic tape 4 and filled plastics 3 hot melts are overall structure, can make the outer wall of tube wall of present embodiment hollow wall steel plastic composite wound pipe more level and smooth.Plastic tube 2 in the present embodiment can be processed for polyethylene (Polyethylene is called for short PE) material with filled plastics 3, and plastic tape 4 is that polypropylene PP (Polypropylene is called for short PP) material is processed.Because the PP material is better than the hardness and the wear-resisting property of PE material, can strengthen the outer wall construction intensity and the wear-resisting property of present embodiment hollow wall steel plastic composite wound pipe through plastic tape 4.
Wherein, the cross section of the steel pipe 1 in the present embodiment can be circle or rectangle or ellipse, and present embodiment hollow wall steel plastic composite wound pipe does not limit the concrete structure of the cross section of steel pipe 1.In addition, because the outer wall of present embodiment hollow wall steel plastic composite wound pipe is more level and smooth, two adjacent hollow wall steel plastic composite wound pipes can adopt telescopic Placement to link together.
Present embodiment hollow wall steel plastic composite wound pipe; Form the tube wall of body through the composite pipe of helix structure; And in the gap that composite pipe forms, be provided with filled plastics; Filled plastics are overall structure with the composite pipe hot melt of helix structure, and the steel pipe in the composite pipe is wrapped in the plastic tube fully, have avoided occurring the phenomenon that plastic tube and steel pipe break away from; Carry out spiral when twine handling at composite pipe, steel pipe can be bent more easily, because the cross section of steel pipe is an enclosed construction, effectively reduces and the steel pipe distortion that is distorted occurs, and has reduced the difficulty of processing of hollow wall steel plastic composite wound pipe; And; Because big many of the Young's modulus of steel and strength ratio plastics, under the same conditions, composite pipe can use littler wall thickness; Thereby can save the raw material more than 50% than common plastics entwining tube, effectively reduce the manufacture cost of hollow wall entwining tube.In addition; Wrapped by plastic tube because steel pipe is outer; And the plastic tube in the composite pipe of helix structure through the filled plastics hot melt together; The outer wall of hollow wall steel plastic composite wound pipe is more level and smooth, makes the hollow wall steel plastic composite wound pipe both can be used for water vent and can be used for supplying water, and has widened the application area of hollow wall steel plastic composite wound pipe.
Fig. 4 is hollow wall steel plastic composite wound pipe production method embodiment's of the present invention processing schematic representation; Fig. 5 is the local enlarged diagram in B zone among Fig. 4.Like Fig. 4-shown in Figure 5, present embodiment hollow wall steel plastic composite wound pipe production method comprises:
Step 1, outside steel pipe 1, coat plastic tube 2, form composite pipe 10.Concrete, the step 1 in the present embodiment will form plastic tube 2 and obtain composite pipes 10 on steel pipe 1, for example: can steel pipe 1 be inserted in the plastic tube 2 of prior moulding and mode through heating makes plastic tube 2 and steel pipe 1 formation overall structure.Preferably, can be coated on the steel pipe 1 after plastics are extruded through extruder, just on steel pipe 1, form plastic tube 2 through the extruder extrusion plastic on steel pipe 1, to form plastic tube 2.Wherein, the mode of the plastic overmold steel pipe 1 extruded of extruder can adopt various ways.For example: in the time of the extruder extrusion plastic, steel pipe 1 is placed on the outlet port of extruder, rotates steel pipe 1 simultaneously and be coated with plastics to form plastic tube 2 with outer surface at steel pipe 1; Perhaps, the plastics that extruder is extruded are injected in the mould of prior setting, and steel pipe 1 just can coat one deck plastics after passing mould uniformly on steel pipe 1, just on steel pipe 1, form plastic tube 2 after the cooling.Present embodiment hollow wall steel plastic composite wound pipe production method does not limit the detailed process that forms plastic tube 2 on the steel pipe 1.
Step 2, carry out the composite pipe 10 that spiral twine to handle forms helix structure, and in the composite pipe 10 formed gaps 101 of helix structure, fill molten state plastics 301 to form filled plastics 3 through 6 pairs of composite pipes of Wiring apparatus 10.Concrete,, after forming plastic tube 2 acquisition composite pipes 10 on the steel pipe 1, just can composite pipe 10 be carried out spiral through Wiring apparatus 6 and twine processing through step 1.Wherein, Wiring apparatus 6 can make equipment such as Stetch Wrapping Machine; Composite pipe 10 can twine through Wiring apparatus 6, and in the process of Wiring apparatus 6 coiled composite tubes 10, composite pipe 10 is spirally wound on the Wiring apparatus 6; Inject molten state plastics 301 in the gap 101 between the composite pipe 10 that spiral is provided with, molten state plastics 301 can directly be extruded in the gap 101 that is injected between the composite pipe 10 by extruder 30.The molten state plastics 301 of high temperature can link together plastic tube 2 hot melts on the adjacent composite pipe 10; Thereby the composite pipe 10 that spiral is twined forms the monolithic conduit structure; Steel pipe 1 is wrapped by plastic tube 2; And the gap between the adjacent plastic tube 2 is melted attitude plastics 301 and fills up, and this monolithic conduit structure just becomes the hollow wall steel plastic composite wound pipe after cooling.Further; For the outer wall that makes the hollow wall steel plastic composite wound pipe that present embodiment hollow wall steel plastic composite wound pipe production method produces more level and smooth; Step 2 in the present embodiment is specially: carry out spiral through 6 pairs of composite pipes of Wiring apparatus 10 and twine processing, and in the composite pipe 10 formed gaps 101 of helix structure, fill molten state plastics 301 to form filled plastics 3; Simultaneously, in composite pipe 10 outer felt of helix structure around plastic tape 4.Concrete; Through when composite pipe 10 being carried out spiral winding processing; The outside at the composite pipe that becomes helix structure 10 is wound with plastic tape 4 simultaneously; Under the hot melt effect of high-temperature fusion attitude plastics 301, plastic tube 2, filled plastics 3 and plastic tape 4 hot melts are overall structure, and plastic tape 4 will be wrapped in the outside of composite pipe 10.
Further, in order to make steel pipe 1 and plastic tube 2 more firm combining, present embodiment hollow wall steel plastic composite wound pipe production method before step 1, also comprises:
Step 1a, employing PUR coat steel pipe 1, to form heat-fusing glue layer 5 on the steel pipe 1; Step 1 is specially: outside heat-fusing glue layer 5, form plastic tube 2.Concrete, through heat-fusing glue layer 5 is set on steel pipe 1, can be through heat-fusing glue layer 5 with steel pipe 1 and plastic tube 2 more firm combining.Wherein, PUR can be through extruder for shaping on steel pipe 1.Present embodiment hollow wall steel plastic composite wound pipe production method does not limit the forming process of heat-fusing glue layer 5.
Further, present embodiment hollow wall steel plastic composite wound pipe production method after step 2, also comprises: step 3, carry out fixed length cutting and handle.After processing the hollow wall steel plastic composite wound pipe, can obtain the hollow wall steel plastic composite wound pipe of fixed length through step 3 through present embodiment hollow wall steel plastic composite wound pipe production method.
Present embodiment hollow wall steel plastic composite wound pipe production method; Form composite pipe through coating plastic pipe on steel pipe; Then composite pipe is carried out spiral and twine to handle, simultaneously the molten state plastics are injected in the gap that the composite pipe of helix structure forms, the molten state plastics of high temperature are integral adjacent plastic tube hot melt; Because steel pipe is wrapped in the plastic tube fully, avoided occurring the phenomenon that plastic tube and steel pipe break away from; When composite pipe carries out spiral winding processing; Steel pipe can be bent more easily; And because the cross section of steel pipe is an enclosed construction; Effectively reduce and the steel pipe distortion that is distorted occurs, reduced the difficulty of processing of hollow wall steel plastic composite wound pipe through hollow wall steel plastic composite wound pipe production method; And; Because big many of the Young's modulus of steel and strength ratio plastics, under the same conditions, composite pipe can use littler wall thickness; Thereby can save the raw material more than 50% than common plastics entwining tube, effectively reduce the manufacture cost of hollow wall entwining tube.In addition; Wrapped by plastic tube because steel pipe is outer; And the plastic tube after the spiral winding is handled merges through the molten state plastics of high temperature; The outer wall of hollow wall steel plastic composite wound pipe is more level and smooth, makes the hollow wall steel plastic composite wound pipe both can be used for water vent and can be used for supplying water, and has widened the application area of hollow wall steel plastic composite wound pipe.
What should explain at last is: above embodiment is only in order to explaining technological scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technological scheme that aforementioned each embodiment put down in writing, and perhaps part technical characteristics wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technological scheme of relevant art scheme.
Claims (10)
1. hollow wall steel plastic composite wound pipe; It is characterized in that, comprise body, be provided with the composite pipe of helix structure in the tube wall of said body; Said composite pipe comprises steel pipe and plastic tube; Said plastic tube is coated on outside the said steel pipe, is provided with filled plastics in the gap that said composite pipe forms, and said filled plastics and said plastic tube hot melt are overall structure.
2. hollow wall steel plastic composite wound pipe according to claim 1 is characterized in that said filled plastics form the inner and outer wall of said tube wall.
3. hollow wall steel plastic composite wound pipe according to claim 1 is characterized in that, also is provided with heat-fusing glue layer between said steel pipe and the said plastic tube.
4. according to the arbitrary described hollow wall steel plastic composite wound pipe of claim 1-3, it is characterized in that said body also is wound with plastic tape outward.
5. hollow wall steel plastic composite wound pipe according to claim 4 is characterized in that, said plastic tube and said filled plastics are processed for the PE material, and said plastic tape is processed for the PP material.
6. hollow wall steel plastic composite wound pipe according to claim 1 is characterized in that, the cross section of said steel pipe is circle or rectangle or ellipse.
7. the production method of the hollow wall steel plastic composite wound pipe described in claim 1 is characterized in that, comprising:
Step 1, outside steel pipe, coat plastic tube, form composite pipe;
Step 2, composite pipe is carried out the composite pipe that spiral twine to form helix structure, and in the formed gap of the composite pipe of helix structure, fill the molten state plastics to form filled plastics through Wiring apparatus.
8. hollow wall steel plastic composite wound pipe production method according to claim 7; It is characterized in that; Step 2 is specially: through Wiring apparatus composite pipe is carried out spiral and twine, and in the formed gap of the composite pipe of helix structure, fill the molten state plastics to form filled plastics; Simultaneously, in the composite pipe outer felt of helix structure around plastic tape.
9. hollow wall steel plastic composite wound pipe production method according to claim 7 is characterized in that, before step 1, said hollow wall steel plastic composite wound pipe production method also comprises:
Step 1a, employing PUR coat steel pipe, on steel pipe, to form heat-fusing glue layer;
Step 1 is specially: outside heat-fusing glue layer, coat plastic tube.
10. according to the arbitrary described hollow wall steel plastic composite wound pipe production method of claim 7-9, it is characterized in that after step 2, said hollow wall steel plastic composite wound pipe production method also comprises:
Step 3, carry out fixed length cutting and handle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100677662A CN102606813A (en) | 2012-03-15 | 2012-03-15 | Hollow-wall steel-plastic composite winding pipe and manufacturing method thereof |
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| CN2012100677662A CN102606813A (en) | 2012-03-15 | 2012-03-15 | Hollow-wall steel-plastic composite winding pipe and manufacturing method thereof |
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Cited By (4)
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| CN103411043A (en) * | 2013-06-28 | 2013-11-27 | 句容市百事特复合材料有限公司 | Reinforced plastic tube wound by LFT material strips and producing method thereof |
| CN105538756A (en) * | 2016-02-27 | 2016-05-04 | 云南驰通环保科技有限责任公司 | Production method of steel belt reinforced hollow double-flat-wall polyethylene intertwined drainage pipe |
| CN109551047A (en) * | 2018-10-30 | 2019-04-02 | 湖北兴欣科技股份有限公司 | Multiple enhancing steel-plastics composite pipe cutting method |
| CN113478857A (en) * | 2021-07-12 | 2021-10-08 | 河北亚明塑管有限公司 | Method and equipment for producing flat hole winding structure wall pipe |
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| CN113478857A (en) * | 2021-07-12 | 2021-10-08 | 河北亚明塑管有限公司 | Method and equipment for producing flat hole winding structure wall pipe |
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Application publication date: 20120725 |