CN101537712A - Continuous production technology of polyvinyl chloride pipe stretched in two directions - Google Patents
Continuous production technology of polyvinyl chloride pipe stretched in two directions Download PDFInfo
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- CN101537712A CN101537712A CN200910020301A CN200910020301A CN101537712A CN 101537712 A CN101537712 A CN 101537712A CN 200910020301 A CN200910020301 A CN 200910020301A CN 200910020301 A CN200910020301 A CN 200910020301A CN 101537712 A CN101537712 A CN 101537712A
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Abstract
The invention discloses a continuous production technology of a polyvinyl chloride pipe stretched in two directions. Materials are mixed according to the processing requirement of the polyvinyl chloride pipe, supplementary materials are mixed into mature materials in a mixer in sequence, the mature materials are shaped into a fused pipy material base in a machine head by the plasticization of an extruding machine, the material base enters a cooling section to be cooled to approach to a glass state, the cooled material base then enters a radial expanding section to be stretched in the radial direction and the axial direction under the traction of a tractor, a pipe blank which is toughened and strengthened in the radial direction and the axial direction is obtained, the pipe blank is cooled and shaped, a semi-finished product is obtained, and a finished product is obtained by the spin over of the semi-finished product. The pipe produced by the technology has the advantages of good shock resistance, physical and mechanical properties, and the like.
Description
Technical field
The invention belongs to processing of high molecular material technology, especially a kind of technology of polychloroethylene pipes processing.
Background technology
The PVC-U pipe-line system has had nearly 70 years developing history, has advantages such as high-modulus, high strength and lower price because of it, so be the plastic duct system of whole world application quantity maximum always, has obtained using widely in a lot of fields of modern society.But because there is the weakness on the fragility in the PVC-U pipeline, reduced the usage safety performance of pipeline, so adopt higher design safety factor (DSF) value (2.5) at the feedwater piping applied environment always, it is thicker that the tube wall thickness of same nominal pressure is wanted, and cost of material is higher relatively.
The polyvinyl chloride pipe stretched in two directions that this technical scheme relates to is (English the be called for short PVC-O) of the YorkshireImperialPlastics of Britain in the leading exploitation seventies the earliest, Australian Vinidex was arranged afterwards, U.S. Uponor-ETI, Dutch Polva and French Seperef produce.What adopt in early days all is " off-line " processing technology, be extrusion molding and the PVC-U tubing section cooled off to be expand into by heating and pressurization require size to realize orientation in mould, but off-line processing technology speed of production is low, and the equipment investment height is difficult to promote.
Developed afterwards that " online " is orientated in extrusion process, and produced the production technology of polyvinyl chloride pipe stretched in two directions continuously, domestic in recent years had some scientific research institutions and consortium exploring exploitation.Understand from patent and document, it generally all is first axial tension, be heated to again after the typing cooling and carry out radial drawing more than the vitrification point, requirement to equipment is all very harsh, and prior art equipment quantity-produced poor stability, basically be in laboratory's stage, some practical applicability is not strong.
Summary of the invention
The object of the present invention is to provide a kind of toughness reinforcing tubing production technology scheme of self-reinforcing that can continuous and stable production.
The technical solution adopted in the present invention is: continuous production technology of polyvinyl chloride pipe stretched in two directions, and step is:
1) blendes together grog: various supplementary materials are dropped into batch mixer according to feeding sequence, high-speed mixing is to the about 115-125 of temperature ℃, and rotating speed is 900-1600rpm, carries out the low speed cold mixing then to 40-45 ℃, cooled mixed ingredients becomes grog through stirring also, and grog was placed in storage tank 18-24 hour;
2) plastify into melting charge: plastify through extruder, through the head shunting, typing, become the cylindric material base of viscous state, expressing technique feed zone temperature is set at 180-190 ℃, fluxing zone is set at 170-180 ℃, and metering section is set at 160-170 ℃, and setting process section head design temperature is 180-190 ℃;
3) cooling: material base enters cooling die, and material base is cooled near glassy state, and the head design temperature is 85-110 ℃;
4) stretch: the material base of cooling enters the radial dilatation mould and carries out radial drawing, and the material base after the radial drawing enters the radial drawing stable section, carries out axial tension under draw;
5) typing: the cooling of in the Vacuum shaping groove, finalizing the design of the material base after the biaxial tension, make semi-finished product;
6) moulding: with the heating of tubing one end, finished product is made in enlarging.
Continuous production technology of polyvinyl chloride pipe stretched in two directions, its major parameter of producing head is:
1) the head compression ratio is 20-50;
2) angle of flare of spreader is 60-90 °;
3) angle of throat is 40-80 ° less than the angle of flare;
4) fusion material base flat segments length is 10 times of flat segments die cavity gap;
5) length of the straight cooling section of material base be flat segments die cavity gap 60-80 doubly;
6) material base radial drawing Duan Weiyi circular cone expansion face and long core, the chamber area of circular cone expansion face arbitrary section equates; Radial drawing section height value is between flat segments die cavity internal diameter numerical value and stable section die cavity internal diameter numerical value; The radial drawing section angle of flare is 90-150 °; Radial drawing is than being 1.8-2.7;
7) radial drawing material base stable section core external diameter be institute's production tube outer diameter 1.01-1.18 doubly, core length be tube outer diameter 0.6-1.2 doubly, external mold length be tube wall thickness 3-8 doubly; The die cavity gap by the production tube wall thickness 1.2-1.5 doubly.
The extruder head shunting is fixed to material base and is divided into shunting section and flat segments, and being cooled to glassy state is straight cooling section, and stretching is divided into radial dilatation section and radial dilatation stable section.
Enlarging adds the thermal recovery electromagnetic heater tubing is conducted heating from the outside and inboard.
On traditional hard polyethylene pipe prescription and production technology basis, change thick material base cooling earlier in the prior art, the back heating, Leng Que conventional thought again, make the material base of the viscous state of plasticizing forming, evenly be cooled near glassy state, directly carry out radial and axial stretching then, obtain the toughness reinforcing tubing of self-reinforcing through cooling and shaping again.Reduce the link that tubing is heated again, on operation and in the using energy source, all had extraordinary technical advantage, reached simplification and purpose of energy saving.
Adopted simultaneously and used mould accurately to control the technical scheme of production technology, make near the radial drawing of the material base of glassy state and can accomplish accurately to control temperature, accurately control stretch ratio, accurately control draw speed, product quality process control ability is effectively improved stable and reliable product quality.
Adopt the electromagnetic heater of special construction that tubing is heated from the outside and inboard, can control enlarging heating process accurately, improved product quality and yield rate.
Compared with prior art, advantage of the present invention is: the polyvinyl chloride pipe stretched in two directions according to this explained hereafter possesses excellent physical and mechanical properties, and polyvinyl chloride pipe stretched in two directions hoop burst stress has improved a lot, and anti-pressure ability has obtained large increase; In falling weight impact test, the polyvinyl chloride pipe stretched in two directions impact resistance has obtained enhancing.
| PVC-O tubing | Sample 1 | Sample 2 | Sample 3 |
| Tube outer diameter mm | 90.21 | 90.18 | 90.23 |
| Tubing minimum wall thickness (MINI W.) mm | 2.81 | 2.82 | 2.84 |
| Burst pressure Mpa | 3.35 | 3.48 | 3.38 |
| Hoop burst stress Mpa | 52.10 | 53.90 | 52.00 |
| PVC-O tubing | Sample 1 | Sample 2 | Sample 3 |
| Tube outer diameter mm | 110.30 | 110.22 | 110.24 |
| Tubing minimum wall thickness (MINI W.) mm | 3.47 | 3.52 | 3.63 |
| Burst pressure Mpa | 2.63 | 2.84 | 2.82 |
| Hoop burst stress Mpa | 40.48 | 43.04 | 41.41 |
The specific embodiment
Continuous production technology of polyvinyl chloride pipe stretched in two directions, step is:
1) blendes together grog: various supplementary materials are dropped into batch mixer according to feeding sequence, high-speed mixing is to the about 115-125 of temperature ℃, and rotating speed is 900-1600rpm, carries out the low speed cold mixing then to 40-45 ℃, cooled mixed ingredients becomes grog through stirring also, and grog was placed in storage tank 18-24 hour;
2) plastify into melting charge: plastify through extruder, through the head shunting, typing, become the cylindric material base of viscous state, expressing technique feed zone temperature is set at 180-190 ℃, fluxing zone is set at 170-180 ℃, and metering section is set at 160-170 ℃, and setting process section head design temperature is 180-190 ℃;
3) cooling: material base enters cooling die, and material base is cooled near glassy state, and the head design temperature is 85-110 ℃;
4) stretch: the material base of cooling enters the radial dilatation mould and carries out radial drawing, and the material base after the radial drawing enters the radial drawing stable section, carries out axial tension under draw;
5) typing: the cooling of in the Vacuum shaping groove, finalizing the design of the material base after the biaxial tension, make semi-finished product;
6) moulding: with the heating of tubing one end, finished product is made in enlarging.
Continuous production technology of polyvinyl chloride pipe stretched in two directions, its major parameter of producing head is:
1) the head compression ratio is 20-50;
2) angle of flare of spreader is 60-90 °;
3) angle of throat is 40-80 ° less than the angle of flare;
4) fusion material base flat segments length is 10 times of flat segments die cavity gap;
5) length of the straight cooling section of material base be flat segments die cavity gap 60-80 doubly;
6) material base radial drawing Duan Weiyi circular cone expansion face and long core, the chamber area of circular cone expansion face arbitrary section equates; Radial drawing section height value is between flat segments die cavity internal diameter numerical value and stable section die cavity internal diameter numerical value; The radial drawing section angle of flare is 90-150 °; Radial drawing is than being 1.8-2.7;
7) radial drawing material base stable section core external diameter be institute's production tube outer diameter 1.01-1.18 doubly, core length be tube outer diameter 0.6-1.2 doubly, external mold length be tube wall thickness 3-8 doubly; The die cavity gap by the production tube wall thickness 1.2-1.5 doubly.
The extruder head shunting is fixed to material base and is divided into shunting section and flat segments, and being cooled to glassy state is straight cooling section, and stretching is divided into radial dilatation section and radial dilatation stable section.
Enlarging adds the thermal recovery electromagnetic heater tubing is conducted heating from the outside and inboard.
A lot of high molecular polymers can significantly be gained in strength and toughness along the molecules align direction by molecularly oriented, and polyvinyl chloride is no exception.Think in theory,, can reach good intensity and toughness near glassy state the time in differently-oriented directivity when plastics stretch.For polyvinyl chloride, its viscous state temperature is about 175-185 ℃, and the glassy state temperature is about 85-110 ℃.Technical essential of the present invention is cooled to the material base of viscous state near glassy state with regard to being, carry out then after the first radial drawing axially that traction obtains the toughness reinforcing material base of the suitable enhancing of outside dimension, further cooling and shaping obtains the tubing that outward appearance and physical dimension meet the demands again.Experiment showed, that tubing radially bearing capacity has had remarkable increase than traditional handicraft, has embodied the advance of the technical program through radially axially stretching of back earlier.
Its process route is as follows:
1) batching: prepare burden according to the polychloroethylene pipes processing request, supplementary material mainly comprises several big classes such as Corvic, plasticizer, solid packing, stabilizing agent, in-lubricant, modifier, external lubricant;
2) blend together grog: various supplementary materials are dropped into mixing roll according to feeding sequence, high-speed mixing is to the about 115-125 of temperature ℃, rotating speed is 900-1600rpm, carry out the low speed cold mixing then to 40-45 ℃, cooled mixed ingredients becomes grog through stirring also, and grog is placed in storage tank became the raw material that can process in 18-24 hour.
3) use extruder to plastify into melting charge: extrusion plasticizing adopts double screw extruder.In the control of expressing technique temperature, feed zone first district's temperature is the highest in the heating-up temperature in each district of extruder, respectively distinguishes temperature later on and progressively reduces, and this can make material just obtain the high temperature heating at feed zone, has quickened the plasticizing of material.The feed zone temperature is set at 180-190 ℃, and fluxing zone is set at 170-180 ℃, and metering section is set at 160-170 ℃.
4) use head to be fixed to the fusion material base: melting charge is finalized the design through the head shunting, becomes the cylindric material base of viscous state, has possessed the blank of tubing.The head design temperature is 180-190 ℃.In this process, owing to must exist support the support of spreader and plug in the head, melt is shunted support and is cut apart afterwards earlier and collaborate the formation weld mark.The alleviation of weld mark mainly depends on melt and keeps molten condition and suitable shunting support design.3) cooling: material base enters cooling die, and material base is cooled near glassy state, and the head design temperature is 85-110 ℃;
5) stretch: the material base of cooling enters the radial dilatation mould and carries out radial drawing, and the material base after the radial drawing enters the radial drawing stable section, carries out axial tension under draw;
6) typing: the cooling of in the Vacuum shaping groove, finalizing the design of the material base after the biaxial tension, make semi-finished product;
7) moulding: with the heating of tubing one end, finished product is made in enlarging.
The production technology scheme of particular manufacturing craft has been introduced in the design of head, and head is divided into shunting section, flat segments, straight cooling section, radial dilatation section and radial dilatation stable section.Material is extruded from extruder, and behind the awl of interflow, melt is in " piston flow ", shunts through spreader then, and the typing through mouthful mould and plug becomes cylindric fusion material base.Cylindric fusion material base is cooled near glassy state at straight cooling section, then in head radial dilatation section by radial drawing, at the radial drawing stable section by axial tension, obtain radial and axial all be stretched near glassy state tubulose material base.
1) the head compression ratio is taked high value, and value is 20-50;
2) angle of flare of spreader is an important parameter in the design, and the general angle of flare is 60-90 °, and the angle of flare is too big, and the materials flow resistance is big, otherwise can cause the materials flow overlong time.
3) angle of throat is less than the angle of flare, and value is 40-80 °.
4) size of flat segments is corresponding with particular manufacturing craft " straight cooling section ".
5) flat segments is shorter, and length is 10 times of flat segments die cavity gap.
6) hard polyethylene pipe strengthens toughening effect preferably can reaching than 1.8-2.7 near the glassy state radial drawing.The value of radial drawing ratio needs difference according to the material glass temperature of composition of raw materials decision and different, and the general low tubing prescription of vitrification point can adopt higher radial drawing ratio, otherwise, need to adopt low draw ratio.
7) the fusion material base cools off and radial drawing by particular manufacturing craft.Concrete technology is the temperature by conduction oil control particular manufacturing craft external mold and core, the inlet size of particular manufacturing craft cooperates fully with die head exit size on last stage, after material base cools off through one section flat segments, temperature drops to gradually near the glassy state temperature province, at this moment material base enters a zone that forces material base to carry out radial drawing, and material base carries out radial drawing under near the glassy state temperature conditions.The material base of process radial drawing enters the flat segments of one section stable radial drawing effect, leaves the particular manufacturing craft outlet then, by axial tension, has formed first radial drawing under the effect of hauling machine, the tubing material base that the back axially stretches.Material base enters calibration sleeve and carries out the Vacuum shaping cooling, has just produced the radial and axial tubing that all is enhanced.
8) length of straight cooling section be flat segments die cavity gap 60-80 doubly.
9) radial drawing Duan Weiyi circular cone expansion face and long core, the chamber area of circular cone expansion face arbitrary section equates; Radial drawing section height value is between straight short die cavity internal diameter numerical value and stable section die cavity internal diameter numerical value; The radial drawing section angle of flare is 90-150 °; Radial drawing is than being 1.8-2.7;
10) stable section core external diameter be institute's production tube outer diameter 1.01-1.18 doubly, core length be tube outer diameter 0.6-1.2 doubly, external mold length be tube wall thickness 3-8 doubly.The die cavity gap by the production tube wall thickness 1.2-1.5 doubly.
Heating and outer heating two parts carried out the electromagnetism heating from outside and inner to tubing respectively in heating mould was divided into.In add thermal recovery inner support core rod, tubing inserts the inner support core rod by transfer device, Hough formula electromagnetic heating furnace clamps tubing, energising is from the inside and outside heating simultaneously of tubing.The tubing flared end is heated near glassy state, reaches the enlarging requirement, extracts out from heater rapidly, inserts the enlarging mould and carries out enlarging, and cooling obtains satisfactory enlarging tubing then.
Claims (4)
1, continuous production technology of polyvinyl chloride pipe stretched in two directions is characterized in that step is:
1) blendes together grog: various supplementary materials are dropped into batch mixer according to feeding sequence, high-speed mixing is to the about 115-125 of temperature ℃, and rotating speed is 900-1600rpm, carries out the low speed cold mixing then to 40-45 ℃, cooled mixed ingredients becomes grog through stirring also, and grog was placed in storage tank 18-24 hour;
2) plastify into melting charge: plastify through extruder, through the head shunting, typing, become the cylindric material base of viscous state, expressing technique feed zone temperature is set at 180-190 ℃, fluxing zone is set at 170-180 ℃, and metering section is set at 160-170 ℃, and setting process section head design temperature is 180-190 ℃;
3) cooling: material base enters cooling die, and material base is cooled near glassy state, and the head design temperature is 85-110 ℃;
4) stretch: the material base of cooling enters the radial dilatation mould and carries out radial drawing, and the material base after the radial drawing enters the radial drawing stable section, carries out axial tension under draw;
5) typing: the cooling of in the Vacuum shaping groove, finalizing the design of the material base after the biaxial tension, make semi-finished product;
6) moulding: with the heating of tubing one end, finished product is made in enlarging.
2, continuous production technology of polyvinyl chloride pipe stretched in two directions according to claim 1 is characterized in that its major parameter of producing head is:
1) the head compression ratio is 20-50;
2) angle of flare of spreader is 60-90 °;
3) angle of throat is 40-80 ° less than the angle of flare;
4) fusion material base flat segments length is 10 times of flat segments die cavity gap;
5) length of the straight cooling section of material base be flat segments die cavity gap 60-80 doubly;
6) material base radial drawing Duan Weiyi circular cone expansion face and long core, the chamber area of circular cone expansion face arbitrary section equates; Radial drawing section height value is between flat segments die cavity internal diameter numerical value and stable section die cavity internal diameter numerical value; The radial drawing section angle of flare is 90-150 °; Radial drawing is than being 1.8-2.7;
7) radial drawing material base stable section core external diameter be institute's production tube outer diameter 1.01-1.18 doubly, core length be tube outer diameter 0.6-1.2 doubly, external mold length be tube wall thickness 3-8 doubly; The die cavity gap by the production tube wall thickness 1.2-1.5 doubly.
3, continuous production technology of polyvinyl chloride pipe stretched in two directions according to claim 1, it is characterized in that the extruder head shunting is fixed to material base and is divided into shunting section and flat segments, being cooled to glassy state is straight cooling section, stretches to be divided into radial dilatation section and radial dilatation stable section.
4, continuous production technology of polyvinyl chloride pipe stretched in two directions according to claim 1 is characterized in that enlarging adds the thermal recovery electromagnetic heater tubing is conducted heating from the outside and inboard.
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| CN200910020301A CN101537712A (en) | 2009-04-07 | 2009-04-07 | Continuous production technology of polyvinyl chloride pipe stretched in two directions |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211401A (en) * | 2010-04-09 | 2011-10-12 | 深圳市沃尔核材股份有限公司 | Pipe expanding device |
| CN102555200A (en) * | 2012-01-31 | 2012-07-11 | 何军 | Polyethylene winding structure wall tube bellmouth forming mold |
| CN104827651A (en) * | 2015-06-09 | 2015-08-12 | 佛山市日丰企业有限公司 | Online two-way stretching device of plastic pipes |
| CN105014942A (en) * | 2015-09-02 | 2015-11-04 | 山东理工大学 | PVC-O (oriented polyvinyl chloride) pipe radial magnetic suction induction stretching device and processing method thereof |
| CN105034399A (en) * | 2015-08-26 | 2015-11-11 | 安徽永高塑业发展有限公司 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
| CN106346739A (en) * | 2016-08-31 | 2017-01-25 | 浙江飞龙管业有限公司 | Production tooling and production method of solid-wall CO pipe |
| CN107553885A (en) * | 2016-06-30 | 2018-01-09 | 新疆天业（集团）有限公司 | A kind of double orientation stretching device |
| CN109676891A (en) * | 2018-12-20 | 2019-04-26 | 山东东宏管业股份有限公司 | One kind is for non-excavation rehabilitation hdpe pipe and preparation method thereof |
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2009
- 2009-04-07 CN CN200910020301A patent/CN101537712A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211401A (en) * | 2010-04-09 | 2011-10-12 | 深圳市沃尔核材股份有限公司 | Pipe expanding device |
| CN102555200A (en) * | 2012-01-31 | 2012-07-11 | 何军 | Polyethylene winding structure wall tube bellmouth forming mold |
| CN102555200B (en) * | 2012-01-31 | 2016-08-03 | 何军 | Polyethylene winding structure wall tube bellmouth forming mold |
| CN104827651A (en) * | 2015-06-09 | 2015-08-12 | 佛山市日丰企业有限公司 | Online two-way stretching device of plastic pipes |
| CN104827651B (en) * | 2015-06-09 | 2018-01-09 | 日丰企业（佛山）有限公司 | A kind of online two-way stretch device of plastic pipe |
| CN105034399A (en) * | 2015-08-26 | 2015-11-11 | 安徽永高塑业发展有限公司 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
| CN105014942A (en) * | 2015-09-02 | 2015-11-04 | 山东理工大学 | PVC-O (oriented polyvinyl chloride) pipe radial magnetic suction induction stretching device and processing method thereof |
| CN107553885A (en) * | 2016-06-30 | 2018-01-09 | 新疆天业（集团）有限公司 | A kind of double orientation stretching device |
| CN106346739A (en) * | 2016-08-31 | 2017-01-25 | 浙江飞龙管业有限公司 | Production tooling and production method of solid-wall CO pipe |
| CN106346739B (en) * | 2016-08-31 | 2018-12-14 | 浙江飞龙管业有限公司 | A kind of the production tooling and production method of solid wall CO pipe |
| CN109676891A (en) * | 2018-12-20 | 2019-04-26 | 山东东宏管业股份有限公司 | One kind is for non-excavation rehabilitation hdpe pipe and preparation method thereof |
| CN109676891B (en) * | 2018-12-20 | 2021-07-02 | 山东东宏管业股份有限公司 | High-density polyethylene pipe for trenchless restoration and preparation method thereof |
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Application publication date: 20090923 |