CN101791850A - One-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene - Google Patents
One-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene Download PDFInfo
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- CN101791850A CN101791850A CN201010145097A CN201010145097A CN101791850A CN 101791850 A CN101791850 A CN 101791850A CN 201010145097 A CN201010145097 A CN 201010145097A CN 201010145097 A CN201010145097 A CN 201010145097A CN 101791850 A CN101791850 A CN 101791850A
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Abstract
The invention relates to a one-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene, which comprises mould interfaces 1 and 1', flow regulating valves 2 and 2', branch flow passages 3 and 3', a one-discharge extruding mould head interface 4, a shunt shuttle 5, a mould core 6, a shaping segment 7 and a cooling water jacket 8; the mould interface 1 is connected with an extruder head through a sieve plate; each branch flow passage 3 or 3' is provided with the flow regulating valve 2 or 2', the flow regulating valves 2 and 2' are used for regulating the material flow capacity of the branch flow passages to maintain the material flow of each branch flow passage to be uniformly extruded; the branch flow passages 3 and 3' are connected with a main flow passage through the mould interfaces 1 and 1' and used for dividing a material into a plurality of branch flow passages; one end of the one-discharge extruding mould head interface 4 is connected with the branch flow passages 3', the other end thereof is sequentially connected with the shunt shuttle 5, the shaping segment 7 and the cooling water jacket 8, and the mould core 6 is connected with the mould head interface 4 by penetrating through the shunt shuttle 5, the shaping segment 7 and the cooling water jacket 8; and a cone angle of 1 to 3 degrees is formed between the branch flow passage 3 or 3' and the main flow passage.
Description
Technical field
The present invention relates to the ultrahigh molecular weight polyethylene tubing extrusion technology, have more tubing die design and application technology in particular for a mould of ultra-high molecular weight polyethylene.
Background technology
Ultra-high molecular weight polyethylene (UHMWPE) is the high thermoplastic of a kind of molecular weight, outstanding feature such as have that coefficient of friction is little, low, the chemical proofing of abrasion, resistance to impact, stress cracking resistance, frost resistance, heat insulating ability, self lubricity, anti-fouling tendency, wholesomeness are good.In the oil field, field such as communications and transportation, national defence, weaving, papermaking, mining industry, agricultural, chemical industry has a wide range of applications, especially be most widely used ducted.The tubing made from this material has good resistance to impact, corrosion resistance, mar proof, self lubricity, avirulence and lower temperature resistance, and the life-span is 5-7 a times of common steel tube.Have clear superiority and huge market prospects at field ultrahigh molecular weight polyethylene tubings such as fly ash in electric power plant conveying, river course and bay desilting sediment transport, cement, lime conveying and the conveyings of water-coal-slurry pipeline than conventional plastic and metal pipe material.
All good characteristics of ultra-high molecular weight polyethylene all come from its high molecular weight, and molecular weight high-wear resistance more is good more, but companion's and be process difficult more.Pressing process and plunger pushing moulding are adopted in the processing of tradition ultra-high molecular weight polyethylene, and speed is slow, efficient is low, has seriously restricted the development of ultra-high molecular weight polyethylene industry.Over nearly 50 years, the processing characteristics of ultra-high molecular weight polyethylene material, the also corresponding all good characteristics that reduce polyvinyl resin with super-high molecular weight self have been improved though adopt the method for adding the mobile processing aid of various promotions and a large amount of low molecular polyethylenes.Continuous progress along with process technology, the screw rod continuous extrusion has been evolved in plunger pushing moulding, but adopt traditional polyethylene pipe material processing method, be difficult to control and the heat absorption of getting rid of polyethylene watery fusion in the extrusion and the accumulation of heat of recrystallization process, cause the molecular weight of end article to be no more than 1,000,000.This has become this area and has reached the global problem that is difficult to solve over 50 years.
The molecular weight of ultra-high molecular weight polyethylene is several times to tens times of common high density polyethylene (HDPE), melt viscosity is high, almost there is not flowability, adopt the conventional poly method processing resulting product molecular weight less than 1,000,000 that melt extrudes, utilize nearly fusing point extrusion method can avoid and weaken the degraded of polymer in extrusion, but extruded velocity is still very slow, is generally the 3-5 cm per minute, and production efficiency is very low.The zero shear rate of ultra-high molecular weight polyethylene is very low, and is very sensitive to shearing, if improve extruded velocity, is easy to generate melt fracture.At this phenomenon, the present invention proposes the tubing extrusion die structural design that a mould has more and realized the industrialization that ultrahigh molecular weight polyethylene tubing one mould has more first.
Summary of the invention
The extruding pipe material die head that one mould has more
The invention provides an a kind of mould that is used for ultra-high molecular weight polyethylene and have more the tubing extrusion die, comprise mould interface 1,1 ', flow control valve 2,2 ', branch's runner 3,3 ', singly go out extrusion die interface 4, spreader 5, core rod 6, typing section 7, cooling jacket 8; Mould interface 1 links to each other with extruder head by sieve plate; Each branch's runner 3,3 ' in be provided with flow control valve 2,2 ', flow control valve 2,2 ' be used to regulate the mass flow of branch's runner is extruded with the logistics equilibrium of keeping each branch flow passage; Branch's runner 3,3 ' by mould interface 1,1 ' link to each other with sprue, and material is divided into a plurality of branch flow passages; Singly go out extrusion die interface 4 one ends and branch runner 3 ' be connected, the other end connects spreader 5, typing section 7 and cooling jacket 8 successively, and core rod 6 runs through spreader 5, typing section 7 and cooling jacket 8 and is connected to die head interface 4; Branch's runner 3,3 ' and sprue between be 1-3 ° cone angle.
Can to be that a mould is two go out structure to described die head, and two branch's runners distribute side by side or two-wayly singly go out to distribute.
Described die head can be that a mould four goes out structure, and four branch's runners distribute side by side, double distribution or be two-way scene 2 and distribute.
Description of drawings
Fig. 1 is used for that ultra-high molecular weight polyethylene one mould is two to go out extruding pipe material die head schematic diagram.
Fig. 2 is used for ultra-high molecular weight polyethylene one mould unidirectional four to go out extruding pipe material die head schematic diagram.
Fig. 3 is used for two-way pair of ultra-high molecular weight polyethylene one mould to go out extruding pipe material die head schematic diagram.
The specific embodiment
Be that example is described with reference to the accompanying drawings with a mould pair die head that goes out below.
1, a mould pair die design that goes out
Branch's runner 3 is a mould pair critical components that go out, and it links to each other with sprue by mould interface 1, and branch's runner 3 is bright and clean level and smooth, and is 1-3 ° cone angle between the sprue.When cone angle during less than 1 °, head pressure is less than 8MPa, and tubing density is not enough, and storeroom merges poor performance; When cone angle during greater than 3 °, head pressure is higher than 25MPa, and load on host computers is big, influences the adjusting of extruded velocity.
Flow control valve 2 changes the interior mass flow of branch's runner by the vertical displacement of regulating bolt, adjusts head pressure and variation of temperature simultaneously, can keep pair equilibrium that goes out head tubing by the effect of control valve and extrude.
2. the feedback regulation of pressure sensor and temperature sensor
The pressure that head section is small changes all can influence material melt viscosity and variation of temperature, and the equilibrium that can influence tubing is extruded.Average head pressure rising 1MPa, melt temperature can raise 5 ℃.Early warning threshold value by setting head pressure (± 1.5MPa), show the force value of adjusting extruder head, can keep equilibrium and extrude.
3. the adjusting of cooling jacket
Inflow by adjusting cooling jacket and flow can realize that the equilibrium of both sides tubing extrudes.Material comes out from spreader, enters core rod and typing section, by the water jacket cooling and shaping of typing section rear end.Consider that running water temperature at all seasons differs greatly,, adopt the mould temperature controller, make long-term water temperature remain on a definite value in order to reduce the internal stress of tubing.At the water inlet of two cooling jackets micro-running water water inlet adjuster is housed respectively, with this as adjusting the supplementary means of pressing in the extruding pipe material.
Embodiment
One mould list is installed respectively on two 60mm single screw extrusion machines that die head and a mould are two to go out die head, carry out
Ultrahigh molecular weight polyethylene tubing is extruded, and the molecular weight of goods is no less than 2,000,000, and that detects tubing goes out speed, power consumption and combination property.
1) a mould list goes out and a mould is two goes out ultrahigh molecular weight polyethylene tubing and go out speed and energy consumption relatively
| Back pressure MPa | Melt temperature ℃ | Engine speed rpm | Total moulding speed mm/min | Power consumption degree electricity/rice | |
| One mould list goes out | ??9.88 | ??188 | ??150 | ??30 | ??2.39 |
| One mould list goes out | ??12.82 | ??185 | ??155 | ??50 | ??1.21 |
| One mould list goes out | ??10.36 | ??185 | ??210 | ??80 | ??0.781 |
| One mould is two to be gone out | ??14.76 | ??189 | ??450 | ??146 | ??0.765 |
| One mould is two to be gone out | ??16.82 | ??191 | ??800 | ??169 | ??0.648 |
2) a mould list goes out and a mould is two goes out the ultrahigh molecular weight polyethylene tubing combination property relatively
The invention effect
As above shown in the table, along with the raising of engine speed, the tubing extruded velocity is also in synchronous increase, and a mould is two to be gone out tubing and go out speed ratio one mould list and go out tubing and go out speed and exceed 1.11 times, and power consumption has but reduced 17%, and pipe workpiece quality is all qualified.
Claims (3)
1. a mould that is used for ultra-high molecular weight polyethylene has more the tubing extrusion die, comprise mould interface (1,1 '), flow control valve (2,2 '), branch's runner (3,3 '), singly go out extrusion die interface (4), spreader (5), core rod (6), typing section (7), a cooling jacket (8); Mould interface (1) links to each other with extruder head by sieve plate; In each branch's runner (3,3 ') flow control valve (2,2 ') is set, flow control valve (2,2 ') is used to regulate the mass flow of branch's runner, extrudes with the logistics equilibrium of keeping each branch flow passage; Branch's runner (3,3 ') links to each other with sprue by mould interface (1,1 '), and material is divided into a plurality of branch flow passages; Singly going out extrusion die interface (4) one ends is connected with branch's runner (3 '), the other end connects spreader (5), typing section (7) and cooling jacket (8) successively, and core rod (6) runs through spreader (5), typing section (7) and cooling jacket (8) and is connected to die head interface (4); It is characterized in that, be 1-3 ° cone angle between branch's runner (3,3 ') and the sprue.
2. have more the tubing extrusion die according to the described mould that is used for ultra-high molecular weight polyethylene of claim 1, it is characterized in that described die head is that a mould is two and goes out structure, two branch's runners distribute or are two-way singly to go out to distribute side by side.
3. have more the tubing extrusion die according to the described mould that is used for ultra-high molecular weight polyethylene of claim 1, it is characterized in that described die head is that a mould four goes out structure, four branch's runners distribute side by side, double distribution or be two-way scene 2 and distribute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010145097A CN101791850A (en) | 2010-04-13 | 2010-04-13 | One-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010145097A CN101791850A (en) | 2010-04-13 | 2010-04-13 | One-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene |
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| CN101791850A true CN101791850A (en) | 2010-08-04 |
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| CN201010145097A Pending CN101791850A (en) | 2010-04-13 | 2010-04-13 | One-mould multi-discharge extruding pipe mould head for super high molecular weight polyethylene |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310539A (en) * | 2011-08-26 | 2012-01-11 | 张家港市杰达机械制造有限公司 | Extrusion die of plastic pipe production equipment with one runner inlet and eight runner outlets |
| CN102601969A (en) * | 2012-03-14 | 2012-07-25 | 天津中财型材有限责任公司 | Mould and process for one-mould-double-output forming of polypropylene random copolymer pipes |
| CN103538236A (en) * | 2012-07-16 | 2014-01-29 | 宁波康润机械科技有限公司 | Plastic pipe extrusion mold |
| CN109291403A (en) * | 2018-10-23 | 2019-02-01 | 苏州金纬管道科技有限公司 | The double extruders out of one mould |
| CN110948824A (en) * | 2019-12-06 | 2020-04-03 | 湖北森沃光电科技有限公司 | Integrally-formed extrusion die for producing side-emitting optical fibers |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201030638Y (en) * | 2007-02-14 | 2008-03-05 | 黎国锦 | Plastic wiring groove pipe die holder having eight heads |
| CN201685439U (en) * | 2010-04-13 | 2010-12-29 | 张家港联冠新材料有限公司 | One mould and multiple production extruded pipe mould head for ultra high molecular weight polyethylene |
-
2010
- 2010-04-13 CN CN201010145097A patent/CN101791850A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201030638Y (en) * | 2007-02-14 | 2008-03-05 | 黎国锦 | Plastic wiring groove pipe die holder having eight heads |
| CN201685439U (en) * | 2010-04-13 | 2010-12-29 | 张家港联冠新材料有限公司 | One mould and multiple production extruded pipe mould head for ultra high molecular weight polyethylene |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102310539A (en) * | 2011-08-26 | 2012-01-11 | 张家港市杰达机械制造有限公司 | Extrusion die of plastic pipe production equipment with one runner inlet and eight runner outlets |
| CN102601969A (en) * | 2012-03-14 | 2012-07-25 | 天津中财型材有限责任公司 | Mould and process for one-mould-double-output forming of polypropylene random copolymer pipes |
| CN103538236A (en) * | 2012-07-16 | 2014-01-29 | 宁波康润机械科技有限公司 | Plastic pipe extrusion mold |
| CN109291403A (en) * | 2018-10-23 | 2019-02-01 | 苏州金纬管道科技有限公司 | The double extruders out of one mould |
| CN110948824A (en) * | 2019-12-06 | 2020-04-03 | 湖北森沃光电科技有限公司 | Integrally-formed extrusion die for producing side-emitting optical fibers |
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Application publication date: 20100804 |