CN101592279A - Have the connecting means of plastic drain-pipe of strengthening rib and the pipe joint of formation thereof - Google Patents
Have the connecting means of plastic drain-pipe of strengthening rib and the pipe joint of formation thereof Download PDFInfo
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- CN101592279A CN101592279A CNA2009101402631A CN200910140263A CN101592279A CN 101592279 A CN101592279 A CN 101592279A CN A2009101402631 A CNA2009101402631 A CN A2009101402631A CN 200910140263 A CN200910140263 A CN 200910140263A CN 101592279 A CN101592279 A CN 101592279A
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- tubing
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- tie layer
- water bloking
- bloking piece
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Abstract
The invention provides the connecting means that a kind of surface has the thermoplastic drainage pipe of spiral or ring-type strengthening rib, and the formed pipe joint of this method.Connecting means comprises: between the spiral fin of tubing end join domain water bloking piece is set, fill conduit between fin with packing material with thermostability, carry out the connection plastic layer at fin cylindrical bag and form the cylindrical tube joint, pipe joint is connected with Electric thermal smelting belt or shrink belt.Said pipe joint comprises: the water bloking piece that is provided with between spiral fin, foam material of filling in the conduit between fin and the plastic layer that is connected that twines form bag shoe with extrusion sheet.The invention solves this type of tubing because the uneven problem that can't adopt Electric thermal smelting belt to connect of outer wall.
Description
Technical field
The present invention relates to a kind of method and formed pipe joint of this method that has the plastic drain pipe of spiral strengthening rib or equidistant ring-type strengthening rib with Electric thermal smelting belt or shrink belt connection outer wall.
Background technique
The groundwork load of plastic draining pipeline is the outside pressure of going up earth and surface car etc., therefore requires it that enough ring stiffness are arranged.In order to save the ring stiffness that cost of production effectively improves product, most of plastic drain-pipes have all adopted the structure wall construction, wherein a kind of is that the spiral strengthening rib of uniform pitch or equidistant straight ring strengthening rib are arranged on outer pipe wall, what have also is compounded with the reinforcement steel band in strengthening rib, ZL200520112528.4 has just stipulated this product (see figure 1).Adopting Electric thermal smelting belt to connect the plastic tube with weldability, have advantages such as good seal, anti-corrosive properties are good, pipe-line system life-span unanimity, is a kind of comparatively desirable plastic draining pipe connecting method that generally adopts.But above-mentioned outer wall has the plastic drain pipe of ribwork, because the concavo-convex not first of outer wall just can't adopt Electric thermal smelting belt to connect.
Summary of the invention
The purpose of this invention is to provide and a kind ofly connect the method that outer surface has the spiral strengthening rib or directly encircles the plastic tube of strengthening rib from the outside with hot melt band or shrink belt.
Another object of the present invention is, provides a kind of and a kind ofly can be used for the pipe joint that Electric thermal smelting belt or shrink belt connect what outer wall had the spiral strengthening rib or encircled directly that the plastic tube end of strengthening rib makes.
For realizing one of above-mentioned purpose: the tubing that the spiral strengthening rib is arranged for outer surface, method of the present invention is that formed each the spiral channel inlet of strengthening rib is provided with a water bloking piece at least in the tubing join domain, space between the strengthening rib is filled and led up with packing material, form one and comprise fin top curved surface, the water bloking piece top end, the packing material outer round surface is interior coaxial with the diameter circle cylinder, coat a layer thickness on this surface, cylndrical surface even, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, Electric thermal smelting belt or shrink belt are coated on this layer plastics tie layer surface, implement molten or thermal shrinkage connection the electric heating of tubing.
For outer surface is the tubing of ring-type strengthening rib, method of the present invention is that the space between strengthening rib is filled and led up with packing material, form one and comprise the coaxial of fin top curved surface, water bloking piece top end, packing material outer round surface with the diameter circle cylinder, this cylndrical surface surface coating layer thickness evenly, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, Electric thermal smelting belt or shrink belt are coated on this layer plastics tie layer surface, implement molten or thermal shrinkage connection the electric heating of tubing.
Be another purpose of reporting on forming, the tubing that the spiral strengthening rib is arranged for outer surface, pipe joint of the present invention, be included in interior formed each the spiral channel ingress of strengthening rib of pipe end join domain a water bloking piece is set at least, the packing material that space in the tubing join domain between the strengthening rib forms, at the thermoplastic tie layer identical of fin top curved surface, water bloking piece top end, the coating of packing material outer round surface, at surface coated Electric thermal smelting belt of this plastics tie layer or shrink belt with the tubing plastic material.
For outer surface is the tubing of ring-type strengthening rib, pipe joint of the present invention, be included in the packing material that the space between the strengthening rib forms in the tubing join domain, at the thermoplastic tie layer identical of fin top curved surface, the coating of packing material outer round surface, at surface coated Electric thermal smelting belt of this plastics tie layer or shrink belt with the tubing plastic material.
Have the plastic drain-pipe of spiral strengthening rib for outer wall, according to a number of spiral fin, formed all conduit ingress between fin are provided with at least one water bloking piece in its end join domain, prevent that medium crossheading road from flowing.This water bloking piece must have adequate thickness to guarantee its top certain area to be arranged, its material must be identical with the tubing plastics, must melting welding link to each other with fin side and outer pipe wall, guaranteeing fixation and sealing, its top curved surface answer smooth and with the fin top on a coaxial circles cylinder.Have the plastic drain pipe of straight ring strengthening rib for outer wall, water bloking piece can be set.With packing material the conduit space between the join domain inner rib plate of tubing end is filled and led up, formed a coaxial circles cylinder of forming jointly by fin top curved surface, water bloking piece top curved surface and packing material outer rim curved surface.It is even to coat a layer thickness on this cylndrical surface again, and satisfies electric heating melting welding requirement, the thermoplastic tie layer identical with the tubing plastics, and this layer plastics must be that melting welding combines with fin and water bloking piece top curved surface.As above structure has then formed a skin for identical with the tubing plastics in the tubing termination, can be used for the cylndrical surface joint that Electric thermal smelting belt or shrink belt connect.Can carry out conventional Electric thermal smelting belt or shrink belt connection for this joint.In this technological scheme, Electric thermal smelting belt or shrink belt are connected with the melting welding of pipe joint outer layer plastic tie layer or the melting welding of heat bonding and this plastics tie layer and fin and water bloking piece end face has been connected to form the complete sealing of tubing fed sheet of a media.The effect of packed layer is that formation to the coating plastic tie layer provides good supporting in this technological scheme, to guarantee the smooth and indeformable in electric smelting or thermal shrinkage connection procedure of coating plastic tie layer cylndrical surface.Therefore, packing material should have good filling property and thermostability, to guarantee to fill full no dead angle, formed cylndrical surface is regular level and smooth, and forming coating plastic tie layer (having heat produces) and implementing the molten or thermal shrinkage of electric heating when being connected, the heat of transmission importing can not cause its softening transform.One embodiment of the present of invention are that packing material adopts hard foam.
Realize that step of the present invention comprises, step 1, the plastic drain-pipe that has the spiral strengthening rib for outer wall, at first adopt portable miniature extruder formed all conduit ingress between the join domain inner rib plate of tubing end that extrusion die is housed, extruding and moulding water bloking piece in the extruding and moulding mode.This die head can insert between fin and form a sealing die cavity with fin sidewall, outer pipe wall in the conduit, and extruder is extracted behind die cavity squeeze note plastics, is the water bloking piece of formation rule through natural cooling.Be furnished with the hot air shower nozzle on the extruder, before extruding, with hot air heat blown on the squeeze note surface earlier and heat, extrude the high temperature of molten plastic self in addition, can guarantee water bloking piece and the fin and the tube wall fusion of extruding.Also can adopt molding and forming in advance, identical with the conduit cross section have a certain thickness water bloking piece prefabricated component, and water bloking piece is set.Install before the water bloking piece, can with surface heater water bloking piece, fin and pipe outer wall contact surface be heated to molten state earlier, then water bloking piece is pressed into, can guarantee that fusion is fixing.Perhaps directly water bloking piece is placed on the fixed position, the hot gas welding mode is implemented the fillet weld built-up welding to water bloking piece and fin and tube wall contact position and also can by hand.Step 2, adopt two above liner sealed rubber plates, the curved metal template that internal diameter matches with the fin external diameter, bag is carried out and is fixed on the fin cylindrical of pipe end join domain, form the enclosed space of conduit between fin, hard foam is injected in the hole of adopting general foaming machine to open by corresponding each conduit on the template in enclosed space, form the filling between fin.Step 3, adopt extruder configuration sheet material die head, in tubing uniform rotation process, on the cylindrical of pipe end join domain, extrude and twine the plastic sheet identical with the tubing plastics, and nip drum enforcement roll extrusion is set, with plastic sheet and fin and water bloking piece top curved surface good fit and the level and smooth rounding of formed cylndrical surface joint surface that guarantees to twine.The plastic sheet of extruding winding is in melt temperature, and its heat is enough to make itself and fin and water bloking piece end face to fuse under the roll extrusion effect.Can make the joint that to implement Electric thermal smelting belt or shrink belt connection in the tubing end by above-mentioned steps.For the plastic drain pipe of ring-type strengthening rib, can omit step 1.
Description of drawings
Following with the invention will be further described in conjunction with the accompanying drawings:
Fig. 1 is the schematic representation that the prior art outer wall has the plastic drain pipe of spiral strengthening rib (inside is compounded with and strengthens steel band);
Fig. 2 is the schematic representation that the prior art outer wall has the plastic drain pipe of equidistant ring-type strengthening rib;
Fig. 3 is that outer wall has spiral strengthening rib plastic drain pipe end water bloking piece schematic representation is set among the present invention;
The right elevation of Fig. 4 Fig. 3;
Fig. 5 is plastic drain-pipe Electric thermal smelting belt or shrink belt connecting means and the structural representation that outer wall of the present invention has strengthening rib;
Fig. 6 is the right elevation of Fig. 5;
Fig. 7 a and Fig. 7 b are the schematic representation that the present invention makes the molten or thermal shrinkage connecting tube jointing method step 1 of the electric heating that is used for spiral strengthening rib plastic drain pipe;
Fig. 8 is the schematic representation that the present invention makes the molten or thermal shrinkage connecting tube jointing method step 1 another program of the electric heating that is used for spiral strengthening rib plastic drain pipe;
Fig. 9 a and Fig. 9 b are that the present invention makes the molten or thermal shrinkage connecting tube jointing method step 2 schematic representation of electric heating;
Figure 10 is that the present invention makes the molten or thermal shrinkage connecting tube jointing method step 3 schematic representation of electric heating.
Embodiment
In the method and structure shown in Figure 5, the water bloking piece 3 identical with the tubing plastic material is that melting welding is connected with the outer wall of the side tubing 1 of fin 2, plays the effect that stops medium to flow and leak outside along conduit between fin.The supporting effect of playing the plastics tie layer 5 that skin is coated with coaxial circles cylinder of the common formation of the top curved surface of fin 2 water bloking pieces 3 filled the conduit space of 2 of fins by packing material 4, coating plastic tie layer 5 internal surfaces identical with the tubing plastic material are melting welding with the top curved surface of fin 2, water bloking piece 3 and engage, Electric thermal smelting belt 6 (or shrink belt) and tie layer 5 are that electric heating molten (or heat bonding) is connected, and as above structure has formed outer wall is had the spiral strengthening rib or directly encircles the connection that seals fully of the plastic drain pipe of strengthening rib.Connecting means of the present invention is used for directly encircling with structure can not establish water bloking piece 3 when the strengthening rib plastic drain-pipe is connected.
Shown in Figure 3, have the plastic drain pipe 1 of spiral strengthening rib for outer wall, leak outside in order to stop medium to flow along the conduit of 2 of fins, when fin 2 be multi-head spiral, all conduit ingress setting at least one water bloking piece in the join domain of tubing end.
Fig. 7 a and Fig. 7 b are depicted as the present invention and make the step 1 of molten (or thermal shrinkage) jointing method of electric heating that outer wall has the plastic drain-pipe of spiral strengthening rib.Employing is equipped with the portable miniature extruder 8 of extrusion die 7 with injection system moulding water bloking piece 3.Extrusion die 7 is inserted 2 conduits bottoms of fins, and its outer wall with the sidewall of fin 2, tubing 1 is common to be formed one and seals die cavity, fills with plastics with extruder 8 in die cavity, then forms water bloking piece 3 after die head is extracted natural cooling.
Figure 8 shows that the another one scheme of step 1.Produce water bloking piece 3 with the identical material of tubing plastics in advance in the injection moulding mode, water bloking piece 3 be fixed on the described position of Fig. 2 in the mode of hot butt welding, or with water bloking piece 3 in place after, the mode of hot gas welding is carried out fillet welding and is fixed by hand.
Fig. 9 a and Fig. 9 b are depicted as the step 2 that the present invention makes the pipe joint method.Interior curved metal template 9 bags that are lined with sealed rubber plate 10 are carried out on the cylindrical that is fixed on pipe joint zone fin 2, formed the closed channel space of forming jointly by fin 2, tubing 1 outer wall, water bloking piece 3 and template 9, adopt of the perforate of general foaming machine 11 by corresponding conduit on the template 9, inject hard foam 12, wait after its foaming, the sclerosis and template 9 to be taken off the complete filling that has then formed 2 of fins.
Figure 10 shows that the present invention makes the step 3 of pipe joint method.The extruder 13 of sheet material extrusion die 15 is disposed in employing, in tubing 1 uniform rotation, on the cylindrical in pipe joint zone, extrude and twine the plastic sheet 5 identical with the tubing plastic material, and nip drum 14 is set simultaneously to twining sheet material 5 enforcement roll extrusion, after the cladded sheet materials cooling, then form the joint tie layer of level and smooth rounding cylndrical surface.The thickness of thermoplastic tie layer is the 2.5-8.0 millimeter, preferred 3.2-5.0 millimeter.
Claims (13)
1. an outer surface has the connecting means of thermoplastic plastic pipe of the spiral strengthening rib of protrusion, this method comprises, formed each the spiral channel inlet of strengthening rib is provided with a water bloking piece at least in the tubing join domain, space between the strengthening rib is filled and led up with packing material, form one and comprise fin top curved surface, the water bloking piece top end, the packing material outer round surface is interior coaxial with the diameter circle cylinder, coat a layer thickness on this surface, cylndrical surface even, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, Electric thermal smelting belt or shrink belt are coated on this layer plastics tie layer surface, implement molten or thermal shrinkage connection the electric heating of tubing.
2. method according to claim 1, it is characterized in that described water bloking piece adopts the plastics identical with the tubing plastic material, it is melting welding with fin and tubing surface of contact and is connected, and there are enough face of weld that contacts on its top with the plastics tie layer, its top end smooth and with join the fin top on same cylndrical surface;
But described packing material is a kind of hard foam of injection moulding, its full, no dead angle of filling, formed cylndrical surface with fin top curved surface, water bloking piece top curved surface is coaxial smoothly joins with diameter, this packing material has good thermostability, to guarantee when implementing the molten or thermal shrinkage of electric heating and connect, the heat that imports can not cause its softening transform, plays a supporting role;
The material of described thermoplastic tie layer is identical with the tubing plastic material, and thickness is the 2.5-8.0 millimeter, joins with fin and the melting welding of water bloking piece top end.
3 methods according to claim 2, the thickness that it is characterized in that described thermoplastic tie layer are the 3.2-5.0 millimeters.
4. method according to claim 1 is characterized in that described water bloking piece is that form with the welding of extruding and moulding or prefabricated component is arranged on the conduit between the join domain inner rib plate of tubing end;
Described foam material is to fill in the conduit space of form between the join domain inner rib plate of tubing end with cavity injection;
Described plastics tie layer is with the Wrapping formed form of extrusion sheet, is coated on the tubing end and connects formed periphery on the length.
5. method according to claim 4, the water bloking piece that it is characterized in that described extruding and moulding is a portable miniature extruder of being furnished with die head by use, die head inserted in the conduit between fin in the sealing die cavity that is formed by conduit and fin sidewall and outer pipe wall extract behind the squeeze note plastics, natural cooling forms;
Described packing material is to be coated and fixed on the join domain outer rim of tubing end by the metal form that adopts liner sealed rubber plate and interior circular diameter and tubing fin cylindrical to match, form the enclosed space of conduit between fin, use general foaming machine to form to the enclosed space injecting frothing material from the perforate on the template;
Described plastics tie layer is to adopt sheet extruder, extrudes to the cylindrical of the tubing end of uniform rotation join domain and twines the plastic sheet identical with the tubing plastic material, and by the nip drum that rotates the plastic sheet that twines is implemented roll extrusion, forms after the sheet cools.
6. method according to claim 4, the water bloking piece that it is characterized in that described prefabricated form is that to adopt the mode of molding and forming to make material identical with the tubing plastics, the identical water bloking piece product of conduit cross section between shape and fin, the form of taking hot butt welding or hot gas welding are weldingly fixed on the water bloking piece product in the conduit and form;
Described packing material is to be coated and fixed on the join domain outer rim of tubing end by the metal form that adopts liner sealed rubber plate and interior circular diameter and tubing fin cylindrical to match, form the enclosed space of conduit between fin, use general foaming machine to form to the enclosed space injecting frothing material from the perforate on the template;
Described plastics tie layer is to adopt sheet extruder, extrudes to the cylindrical of the tubing end of uniform rotation join domain and twines the plastic sheet identical with the tubing plastic material, and by the nip drum that rotates the plastic sheet that twines is implemented roll extrusion, forms after the sheet cools.
7. an outer surface has the connecting means of thermoplastic plastic pipe of the ring-type strengthening rib of protrusion, this method comprises, space between strengthening rib is filled and led up with packing material, form one and comprise the coaxial of fin top curved surface, water bloking piece top end, packing material outer round surface with the diameter circle cylinder, coat on surface, this cylndrical surface a layer thickness evenly, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, Electric thermal smelting belt or shrink belt are coated on this layer plastics tie layer surface, implement molten or thermal shrinkage connection the electric heating of tubing.
8. method according to claim 7, it is characterized in that but described packing material is a kind of hard foam of injection moulding, its full, no dead angle of filling, formed cylndrical surface with fin top curved surface, water bloking piece top curved surface is coaxial smoothly joins with diameter, this packing material has good thermostability, to guarantee that the heat of importing can not cause its softening transform, plays a supporting role when implementing the molten or thermal shrinkage of electric heating and connect;
The material of described thermoplastic tie layer is identical with the tubing plastic material, and thickness is the 2.5-8.0 millimeter, joins with fin and the melting welding of water bloking piece top end.
9. method according to claim 8, the thickness that it is characterized in that described thermoplastic tie layer are the 3.2-5.0 millimeters.
10. method according to claim 8 is characterized in that described packing material is the foam material of filling in the conduit space of form between the join domain inner rib plate of tubing end with cavity injection;
Described plastics tie layer is with the Wrapping formed form of extrusion sheet, is coated on the tubing end and connects formed periphery on the length.
11. method according to claim 10, it is characterized in that described packing material is to be coated and fixed on the join domain outer rim of tubing end by the metal form that adopts liner sealed rubber plate and interior circular diameter and tubing fin cylindrical to match, form the enclosed space of conduit between fin, use general foaming machine to form to the enclosed space injecting frothing material from the perforate on the template;
Described plastics tie layer is to adopt sheet extruder, extrudes to the cylindrical of the tubing end of uniform rotation join domain and twines the plastic sheet identical with the tubing plastic material, and by the nip drum that rotates the plastic sheet that twines is implemented roll extrusion, forms after the sheet cools.
12. pipe joint that forms by the described connecting means of claim 1, be included at least one water bloking piece that formed each the spiral channel inlet of strengthening rib is provided with in the tubing join domain, be used to fill and lead up the packing material in space between the strengthening rib, by fin top curved surface, the water bloking piece top end, it is coaxial with the diameter circle cylinder that the packing material outer round surface forms, a layer thickness that coats this surface, cylndrical surface is even, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, be coated on this layer plastics tie layer surface, implement electric heating is molten or thermal shrinkage connects Electric thermal smelting belt or shrink belt tubing.
13. pipe joint that forms by the described connecting means of claim 7, comprise the packing material that is used to fill and lead up space between the strengthening rib, by fin top curved surface, packing material outer round surface form coaxial with the diameter circle cylinder, a layer thickness that coats this surface, cylndrical surface evenly, satisfy welding requirements, the thermoplastic tie layer identical with the tubing plastic material, be coated on this layer plastics tie layer surface, implement electric heating is molten or thermal shrinkage connects Electric thermal smelting belt or shrink belt tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101402631A CN101592279A (en) | 2009-07-07 | 2009-07-07 | Have the connecting means of plastic drain-pipe of strengthening rib and the pipe joint of formation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101402631A CN101592279A (en) | 2009-07-07 | 2009-07-07 | Have the connecting means of plastic drain-pipe of strengthening rib and the pipe joint of formation thereof |
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| CN101592279A true CN101592279A (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009101402631A Pending CN101592279A (en) | 2009-07-07 | 2009-07-07 | Have the connecting means of plastic drain-pipe of strengthening rib and the pipe joint of formation thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011110095A1 (en) * | 2010-03-10 | 2011-09-15 | 华瀚科技有限公司 | Plastic-steel wound pipe elbow and manufacturing method thereof |
| CN102374348A (en) * | 2011-09-28 | 2012-03-14 | 深圳市华瀚管道科技股份有限公司 | Pipeline connecting device |
| CN103912741A (en) * | 2013-01-06 | 2014-07-09 | 四川江瀚工业股份有限公司 | Pipe and connection method thereof |
| CN107421225A (en) * | 2017-07-25 | 2017-12-01 | 青岛海尔股份有限公司 | The water pipe exchanging structure and water pipe forwarding method of refrigerator, refrigerator |
| CN108222044A (en) * | 2018-02-06 | 2018-06-29 | 四川睿铁科技有限责任公司 | Assembled oozes weeper drain |
| CN109333966A (en) * | 2018-11-20 | 2019-02-15 | 上海公元建材发展有限公司 | A kind of production of FRPP reinforcement tubing extrusion molding mould and production method |
| CN111412337A (en) * | 2020-04-23 | 2020-07-14 | 林仲谋 | Environment-friendly PE pipe that convenient concatenation was used |
| CN111938476A (en) * | 2020-08-17 | 2020-11-17 | 广州海鸥住宅工业股份有限公司 | Waterproof plate and preparation method thereof |
-
2009
- 2009-07-07 CN CNA2009101402631A patent/CN101592279A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011110095A1 (en) * | 2010-03-10 | 2011-09-15 | 华瀚科技有限公司 | Plastic-steel wound pipe elbow and manufacturing method thereof |
| CN102374348A (en) * | 2011-09-28 | 2012-03-14 | 深圳市华瀚管道科技股份有限公司 | Pipeline connecting device |
| CN103912741A (en) * | 2013-01-06 | 2014-07-09 | 四川江瀚工业股份有限公司 | Pipe and connection method thereof |
| CN103912741B (en) * | 2013-01-06 | 2016-12-28 | 四川江瀚工业股份有限公司 | Pipeline and attaching method thereof |
| CN107421225A (en) * | 2017-07-25 | 2017-12-01 | 青岛海尔股份有限公司 | The water pipe exchanging structure and water pipe forwarding method of refrigerator, refrigerator |
| CN108222044A (en) * | 2018-02-06 | 2018-06-29 | 四川睿铁科技有限责任公司 | Assembled oozes weeper drain |
| CN109333966A (en) * | 2018-11-20 | 2019-02-15 | 上海公元建材发展有限公司 | A kind of production of FRPP reinforcement tubing extrusion molding mould and production method |
| CN111412337A (en) * | 2020-04-23 | 2020-07-14 | 林仲谋 | Environment-friendly PE pipe that convenient concatenation was used |
| CN111938476A (en) * | 2020-08-17 | 2020-11-17 | 广州海鸥住宅工业股份有限公司 | Waterproof plate and preparation method thereof |
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Application publication date: 20091202 |