CN115302735A - Extruder for corrugated pipe preparation - Google Patents
Extruder for corrugated pipe preparation Download PDFInfo
- Publication number
- CN115302735A CN115302735A CN202211245658.XA CN202211245658A CN115302735A CN 115302735 A CN115302735 A CN 115302735A CN 202211245658 A CN202211245658 A CN 202211245658A CN 115302735 A CN115302735 A CN 115302735A
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- Prior art keywords
- threaded rod
- charging barrel
- extrusion screw
- connecting rod
- sliding
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- 238000002360 preparation method Methods 0.000 title claims description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 36
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005381 potential energy Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/397—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using a single screw
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
- B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
- B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of extruders and discloses an extruder for preparing corrugated pipes, which comprises a charging barrel, an extrusion screw, a discharging channel and a discharging nozzle, wherein a torsion spring is fixedly sleeved on the outer surface of the right end of a rotating shaft on the extrusion screw, a threaded rod is fixedly sleeved on the outer side of the torsion spring, sliding cavities are formed in the inner side wall of the charging barrel and positioned on the upper side and the lower side of the discharging channel, a sliding block is connected in the sliding cavities in a sliding mode, and a connecting rod is fixedly connected in the middle of the left side face of the sliding block. According to the invention, the torsion spring is promoted to store energy through the rotation of the extrusion screw rod, the threaded rod is driven to rotate, so that the raw materials can rapidly pass through the discharge channel, the probability of water ripples on the materials is reduced, meanwhile, after the discharging is finished, the torsion force is released by the torsion spring, the threaded rod is driven to rotate reversely, the raw materials in the discharge channel are scraped into the charging barrel through the threaded rod rotating reversely, the hardness difference between the raw materials in the discharge channel and the raw materials in the charging barrel due to the temperature difference is avoided, and the quality of the finished corrugated pipe is improved.
Description
Technical Field
The invention relates to the technical field of extruders, in particular to an extruder for corrugated pipe preparation.
Background
The corrugated pipe is obtained by extruding a molten PVC material into a die through an extruder and cooling, and is widely applied to the fields of municipal engineering, constructional engineering, electrical telecommunication engineering and the like.
But current bellows extruder is when using, because inside melting material extrudees through extrusion screw's rotation, and get into the discharge nozzle through discharging channel, because extruder's heating device sets up the inside at the feed cylinder, this temperature that just makes the inside melting material of discharging channel can be less than the inside temperature of feed cylinder, and the material is extruding the back, the inside partial raw materials that can remain of its discharging channel, however discharging channel and the inside difference in temperature of hopper can cause the hardness difference of two places raw materials, and then when next time extruding, cause the inhomogeneous of finished quality, stress mark appears even, thereby influence the quality of bellows, and the inside raw materials of feed cylinder are formed by multiple material mixing, the synthesis of these materials relies on pivoted extrusion screw to realize completely, but extrusion screw's rotational speed is on the low side, thereby lead to the degree of consistency of raw and other materials mixture on the low side.
Disclosure of Invention
Aiming at the defects of the existing extruder in the use process in the background technology, the invention provides the extruder for preparing the corrugated pipe, which has the advantages of scraping the raw materials in the discharge channel into the charging barrel after the raw materials are extruded, increasing the uniformity of the raw material mixing and improving the exhaust effect of the raw materials, and solves the technical problems in the background technology.
The invention provides the following technical scheme: the utility model provides an extruder for corrugated pipe preparation, includes feed cylinder, extrusion screw, discharging channel and ejection of compact mouth, the fixed cover of surface of pivot right-hand member has connect the torsional spring on the extrusion screw, the fixed threaded rod that has cup jointed in the outside of torsional spring, the surface of pivot leans on right fixedly connected with baffle on the extrusion screw, smooth chamber has all been seted up to the inside upper and lower both sides that just are located discharging channel of lateral wall of feed cylinder, the inside sliding connection in smooth chamber has the slider, the middle part fixedly connected with connecting rod of slider left surface, the surface of connecting rod leans on left fixedly connected with plectrum, the left surface middle part of slider just is located the outside fixedly connected with spring of connecting rod, the inside right side that just is located smooth chamber of lateral wall of feed cylinder has seted up the venthole.
Preferably, the major diameter of the threaded rod is equal to the aperture value of the discharge channel, and the right side of the threaded rod extends into the discharge channel.
Preferably, the outer side surface of the sliding block is in sliding contact with the inner side wall of the sliding cavity, and the sliding cavity is symmetrically distributed in the side wall of the charging barrel by taking the discharging channel as a symmetry axis.
Preferably, the left end of the connecting rod extends into the inner cavity of the charging barrel, and the left end of the connecting rod extending into the charging barrel is in sliding contact with the thread surface of the extrusion screw.
Preferably, the shifting piece is a flexible steel plate, and the shifting piece is located in a first thread groove of the threaded rod when moving to the rightmost stroke.
Preferably, the left end of the spring is fixedly connected to the left side face of the sliding cavity, the potential energy of the spring is larger than the pressure value of the raw material in the charging barrel, the sliding cavity is communicated with the outer side through the air outlet hole, the air outlet hole is an inclined hole, and the inclination of the air outlet hole is equal to the inclination of the outer surface of the discharging nozzle.
The invention has the following beneficial effects:
1. according to the invention, the torsion spring and the threaded rod are designed, the extrusion screw rod is driven to rotate through the transmission shaft, the extrusion screw rod is driven to rotate through the transmission of the torsion spring, the torsion spring is promoted to store energy, in the process of extruding and discharging materials by the extrusion screw rod, the raw materials can rapidly pass through the discharging channel due to the rotation of the threaded rod, the probability of water ripple of the materials is reduced, and after the discharging is completed, the torsion spring after energy storage releases torsion force along with the stop rotation of the extrusion screw rod, so that the threaded rod is driven to rotate reversely, the raw materials in the discharging channel are scraped into the charging barrel through the threaded rod rotating reversely, so that the situation that the hardness of the raw materials in the discharging channel and the raw materials in the charging barrel are different due to the temperature difference is avoided, and the quality of the finished corrugated pipe is improved.
2. The invention designs a threaded rod, a sliding cavity, a sliding block, a connecting rod, a spring and an air outlet hole, wherein the connecting rod is always contacted with the end surface on the right side of an extrusion screw rod under the action of the spring, the position of the end surface of the extrusion screw rod is continuously changed along with the rotation of the extrusion screw rod, so that the connecting rod is driven to reciprocate left and right, when the connecting rod moves to the maximum stroke on the right side, a plectrum is driven by the connecting rod to be positioned in the first thread of the threaded rod, then the connecting rod is driven to be stirred by the threaded rod to deform along with the rotation of the extrusion screw rod when moving left, and the plectrum is gradually restored when leaving the thread of the threaded rod, so that the deformation of the plectrum is used for promoting the extrusion of molten raw materials, thereby accelerating the exhaust speed inside the materials and improving the quality of products, then the left and right movement of the connecting rod is used for driving the sliding block to move inside the sliding cavity, so that the air inside the sliding cavity is continuously extruded and sucked, the air flow speed outside the discharge nozzle is increased under the action of the air outlet hole, thereby accelerating the heat dissipation at the discharge nozzle and accelerating the forming speed of the corrugated pipe.
3. According to the invention, through the design of the threaded rod, the sliding cavity, the sliding block, the connecting rod, the spring, the baffle and the shifting piece, the connecting rod extrudes raw materials in the charging barrel when the connecting rod drives the shifting piece to move left, the extruded raw materials rush to the outer side of the baffle under the action of the baffle, and the raw materials around the baffle can rush into a gap between the baffle and the shifting piece, so that the mutual blending of the raw materials is increased, the uniformity of the raw materials is improved, and the quality of a finished product is further improved.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is a schematic view of the front cut-away internal structure of the present invention;
fig. 3 is a schematic view of the internal structure of the threaded rod of the present invention.
In the figure: 1. a charging barrel; 2. a drive shaft; 3. extruding the screw; 31. a torsion spring; 32. a threaded rod; 33. a baffle plate; 34. a slide chamber; 35. a slider; 36. a connecting rod; 37. a shifting sheet; 38. a spring; 39. an air outlet; 4. a hopper; 5. a heating device; 6. a discharge channel; 7. a discharge nozzle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an extruder for corrugated pipe production comprises a charging barrel 1, wherein a transmission shaft 2 is rotatably connected to the middle of the left side wall of the charging barrel 1, an extrusion screw 3 is fixedly installed at the right end of the transmission shaft 2 located in the charging barrel 1, a hopper 4 is fixedly installed at the left side of the top of the charging barrel 1, a heating device 5 is fixedly installed on the inner cavity side wall of the charging barrel 1, a discharge passage 6 is arranged on the right side of the inner cavity of the charging barrel 1, and a discharge nozzle 7 is fixedly installed at the position, located in the discharge passage 6, of the right side surface of the charging barrel 1.
Referring to fig. 1-3, a torsion spring 31 is fixedly sleeved on the outer surface of the right end of the rotating shaft of the extrusion screw 3, a threaded rod 32 is fixedly sleeved on the outer side of the torsion spring 31, the diameter of the threaded rod 32 is equal to the aperture value of the discharge channel 6, the right side of the threaded rod 32 extends into the discharge channel 6, so that when the threaded rod 32 rotates reversely, raw materials in the discharge channel 6 are scraped into the charging barrel 1, the influence of different hardness on the quality of finished products due to temperature difference is avoided, a baffle 33 is fixedly welded on the outer surface of the rotating shaft on the extrusion screw 3 close to the right side, sliding cavities 34 are formed in the inner side wall of the charging barrel 1 and positioned at the upper and lower sides of the discharge channel 6, a sliding block 35 is connected in the sliding cavity 34 in a sliding manner, the outer side surface of the sliding block 35 is in sliding contact with the inner side wall of the sliding cavity 34, the sliding cavities 34 are symmetrically distributed in the inner side wall of the charging barrel 1 by taking the discharge channel 6 as a symmetry axis, so as to ensure that the sliding block 35 can slide in the sliding cavity 34, thereby promoting the air pressure inside the sliding cavity 34 to be changed continuously and increasing the flowing speed of air, the connecting rod 36 is fixedly welded in the middle of the left side surface of the sliding block 35, the left end of the connecting rod 36 extends into the inner cavity of the charging barrel 1, the left end of the connecting rod 36 extending into the charging barrel 1 is in sliding contact with the thread surface of the extrusion screw rod 3, the extrusion screw rod 3 is ensured to push the connecting rod 36 to move left and right continuously through the thread surface when rotating, the plectrum 37 is fixedly welded on the outer surface of the connecting rod 36 close to the left, the plectrum 37 is a flexible steel plate, the plectrum 37 is positioned in the first thread groove of the thread rod 32 when the plectrum 37 moves to the rightmost stroke, the plectrum 37 is convenient to be matched with the thread rod 32 to promote the plectrum 37 to deform, thereby extruding the molten raw material inside the charging barrel 1, the spring 38 is fixedly welded in the middle of the left side surface of the sliding block 35 and positioned outside the connecting rod 36, inside and the right side that is located smooth chamber 34 of lateral wall of feed cylinder 1 has seted up venthole 39, the left end fixed connection in smooth chamber 34 of spring 38 is the left surface, the potential energy of spring 38 is greater than the pressure value of the inside raw materials of feed cylinder 1, ensure that connecting rod 36 can reset after receiving extrusion screw 3's top, venthole 39 will slide chamber 34 and outside intercommunication, venthole 39 is the inclined hole, and the gradient of venthole 39 equals the gradient of ejection of compact mouth 7 surface, guaranteed the inside atmospheric pressure change accessible venthole 39's of smooth chamber 34 effect, increase the velocity of flow of ejection of compact mouth 7 outside air, the shaping speed of bellows accelerates.
Referring to fig. 1-3, when the device is turned on, the torsion spring 31 is driven to store energy by the rotation of the extrusion screw 3, and the extrusion screw 3 and the threaded rod 32 are in rigid transmission by the state after the energy is stored in the torsion spring 31, so that the threaded rod 32 is driven to rotate, the speed of the raw material passing through the discharge channel 6 is increased by the rotation of the threaded rod 32, the probability of water ripples on the finished product is reduced, after the injection molding is completed, the extrusion screw 3 is also stopped along with the stop of the transmission shaft 2, at the moment, the threaded rod 32 is driven to turn over by the energy stored in the torsion spring 31, and the raw material in the discharge channel 6 is scraped into the charging barrel 1 by the turned threaded rod 32, so that the raw material remained in the discharge channel 6 is avoided, and the quality of the corrugated pipe is influenced by the effect of temperature difference;
secondly, when the device is used normally, the thread surface of the extrusion screw 3 continuously pushes the connecting rod 36 through the rotation of the extrusion screw 3, the connecting rod 36 is made to reciprocate leftwards and rightwards under the action of the spring 38, when the connecting rod 36 moves rightwards, the shifting sheet 37 is driven to move rightwards, the shifting sheet 37 is enabled to be positioned in a first thread groove of the threaded rod 32, and the shifting sheet 37 is enabled to deform by matching with the threaded rod 32 when the connecting rod 36 moves leftwards, so that the deformed shifting sheet 37 is utilized to extrude the molten raw material, the exhaust speed of the raw material is improved, and the quality of a finished product is improved;
simultaneously, remove about along with connecting rod 36 for connecting rod 36 drives slider 35 and removes, utilizes slider 35's removal, makes the inside atmospheric pressure of sliding chamber 34 constantly change, and utilizes the effect of venthole 39 to cause the air flow rate in the ejection of compact mouth 7 outside to accelerated the heat dissipation of ejection of compact mouth 7 department, increased the shaping speed of bellows, improve equipment's machining efficiency.
The using method of the invention has the following working principle:
firstly, add the raw materials into the feed cylinder 1 through the hopper 4, start the drive arrangement and order about the transmission shaft 2 to rotate, start the heating device 5 simultaneously and impel the raw materials to melt and form the molten state, utilize the rotation of transmission shaft 2 to drive extrusion screw 3 to rotate and extrude the molten raw materials, extrusion screw 3 rotates and orders about torsional spring 31 energy storage and drives threaded rod 32 to rotate, simultaneously, along with the rotation of extrusion screw 3, impel the flank of extrusion screw 3 to drive connecting rod 36 and move about, when connecting rod 36 moves right, impel plectrum 37 to move in the first thread groove on the threaded rod 32, and impel plectrum 37 to deform when connecting rod 36 moves left, thereby extrude the molten raw materials, simultaneously, the removal drives slider 35 to move about of connecting rod 36, and impel the air flow rate in the ejection of compact mouth 7 outside to increase through the effect of venthole 39, secondly, after finishing moulding plastics, along with the stall of extrusion screw 3, make the energy storage of torsional spring 31 released, thereby drive the threaded rod 32 upset, and then scrape the raw materials inside discharging channel 6 into the feed cylinder 1.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides an extruder for corrugated pipe preparation, includes feed cylinder (1), extrusion screw (3), discharging channel (6) and ejection of compact mouth (7), its characterized in that: torsion spring (31) have been cup jointed to the outer fixed surface of the last pivot right-hand member of extrusion screw rod (3), threaded rod (32) have been cup jointed to the outside fixed of torsion spring (31), the surface of pivot leans on right fixedly connected with baffle (33) on extrusion screw rod (3), smooth chamber (34) have all been seted up to the inside upper and lower both sides that just are located discharging channel (6) of lateral wall of feed cylinder (1), the inside sliding connection of smooth chamber (34) has slider (35), the middle part fixedly connected with connecting rod (36) of slider (35) left surface, the surface of connecting rod (36) leans on left fixedly connected with plectrum (37), the outside fixedly connected with spring (38) that just are located connecting rod (36) in the left surface middle part of slider (35), venthole (39) have been seted up to the inside right side that just is located smooth chamber (34) of lateral wall of feed cylinder (1).
2. A corrugator machine as claimed in claim 1, wherein: the major diameter of the threaded rod (32) is equal to the aperture value of the discharge channel (6), and the right side of the threaded rod (32) extends into the discharge channel (6).
3. A corrugator machine as claimed in claim 1, wherein: the outer side surface of the sliding block (35) is in sliding contact with the inner side wall of the sliding cavity (34), and the sliding cavity (34) is symmetrically distributed in the side wall of the charging barrel (1) by taking the discharging channel (6) as a symmetry axis.
4. A corrugator machine as claimed in claim 1, wherein: the left end of the connecting rod (36) extends into the inner cavity of the charging barrel (1), and the left end of the connecting rod (36) extending into the charging barrel (1) is in sliding contact with the thread surface of the extrusion screw (3).
5. A corrugator machine as claimed in claim 1, wherein: the shifting piece (37) is a flexible steel plate, and when the shifting piece (37) moves to the rightmost side stroke, the shifting piece (37) is located in a first thread groove of the threaded rod (32).
6. A corrugator machine as claimed in claim 1, wherein: the left end of the spring (38) is fixedly connected to the left side face of the sliding cavity (34), the potential energy of the spring (38) is larger than the pressure value of the raw material in the charging barrel (1), the sliding cavity (34) is communicated with the outer side through the air outlet hole (39), the air outlet hole (39) is an inclined hole, and the inclination of the air outlet hole (39) is equal to the inclination of the outer surface of the discharging nozzle (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211245658.XA CN115302735A (en) | 2022-10-12 | 2022-10-12 | Extruder for corrugated pipe preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211245658.XA CN115302735A (en) | 2022-10-12 | 2022-10-12 | Extruder for corrugated pipe preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115302735A true CN115302735A (en) | 2022-11-08 |
Family
ID=83867934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211245658.XA Pending CN115302735A (en) | 2022-10-12 | 2022-10-12 | Extruder for corrugated pipe preparation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115302735A (en) |
-
2022
- 2022-10-12 CN CN202211245658.XA patent/CN115302735A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 方少明等: "《高分子材料与工程专业系列教材 高分子材料成型工程》", 30 June 2014, 中国轻工业出版社 * |
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Application publication date: 20221108 |
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| RJ01 | Rejection of invention patent application after publication |