CN1073922C - Prepn. method and appts. for self-strengthening plastic pipe material - Google Patents
Prepn. method and appts. for self-strengthening plastic pipe material Download PDFInfo
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- CN1073922C CN1073922C CN97107852A CN97107852A CN1073922C CN 1073922 C CN1073922 C CN 1073922C CN 97107852 A CN97107852 A CN 97107852A CN 97107852 A CN97107852 A CN 97107852A CN 1073922 C CN1073922 C CN 1073922C
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Abstract
The present invention provides an extrusion molding method for self-reinforcing plastic pipe material and a device designed according to the method. The present invention has the technical characteristic that a machine head with a special structure is designed on the base of an ordinary extrusion molding device to make the machine head generate shearing action through the relative rotation of a core rod and a mouth mould in the process of extrusion molding; thus, a macro-molecular chain of a plastic melting body orientates the circumferential direction of the pipe. Meanwhile, the orientating melting body is gradually cooled and shaped to form a specific condensed state structure and obtain a pure plastic self-reinforcing pipe material, and the intensity in the circumferential direction of the pipe is greatly enhanced. The method of the present invention is simple and easy to implement; the device of the present invention has the advantages of simple structure, moderate technologic conditions, simple and convenient control and wide range of application and is capable of conveniently entering industrial production.
Description
The present invention relates to technical field of plastic, be specially the preparation method and the device of self-reinforced plastic pipe, this method and device are specially adapted to thermoplastic.
At present in the world the method for plastics self-reinforcing mainly contain that solid phase is extruded, super stretching, high-pressure injection moulding and extrude self-reinforcing etc., it is inappropriate that these methods are used for extruding pipe material, because can only producing in deformation direction (promptly axial), it strengthens effect, and perpendicular to the deformation direction, its performance does not only have to improve the decline that has on the contrary in various degree, and this intensity distribution is very unreasonable for the tubing of discharge pressure fluid.According to the cell cube force analysis of discharge pressure fluid tubing as can be known, its σ week=2 σ axle, promptly circumferential stress is the twice of axial stress.And the circumferential of stress maximum just in time is the most weak direction of its intensity when axially reinforced pipe is pressed during being subjected to, add in extruding because the existence of plug support, the welded side seam vertically that produces on the tube wall, further reduced the bearing capacity of tubing, thereby the premium properties of material can not utilize fully when being used for the high fluid of discharge pressure fluid, especially pressure.
At this problem, the foreign scholar has carried out number of research projects with regard to how increasing the tubing circumferential strength, but does not all make a breakthrough.Dr.EI sobky as Britain UMIST utilizes a pair of bevel gear to drive plug rotation (seeing accompanying drawing 1), in extrusion, pass through its shear action, improve the circumferential strength that contains 20% glass PA tube, but do not seen it has circumferential self-reinforcing effect to the virgin pp material report (Eureka Transfer Technology P25) in the document; The Zachariades of American I BM Almaden Research Center also utilizes the rotation plug in the mouth mould shown in the accompanying drawing 2, carried out the circumferential Study on Self-reinforcement of pure polyethylene pipe, only obtained the conclusion of part strand along circumferential orientation, the pipe circumferential strength does not obviously improve (A.E.Zachariades, Bin Chung, Advances in polymer Tech 1987,7:4); Professor Bevis of Britain Brunel university utilizes SCOREX (Shear Controlled Orientation in Extrusion) technology to significantly improve the circumferential strength (seeing accompanying drawing 3) (Plastics.Rubber and CompositesProcessing and Applications 16 (1991) 133-137) of fiber glass reinforced polypropylene pipe.Its principle is to utilize the push-and-pull campaign of four pistons to make melt along the plug circumferential flow and cause glass along circumferential orientation.Bevis has brought up to 33Mpa with the circumferential strength of glass PA tube by the common 20Mpa that extrudes with this device.But when this device is used to squeeze the virgin pp material, do not play any self-strengthening.
The present inventor has carried out careful analysis theoretically to above-mentioned research situation, and the common cause of having found out its failure is: adopted the traditional extruding forming method that carries out cooling and shaping behind the melt extrusion neck ring mold again.In this method, when leaving shearing force field, the pipe that molecule has been orientated still is in the high temperature viscous state, and the very easily lax and disorientation of molecule has only the disorientation of orientation glass in the glass reinforced pipe difficult, and the glass orientation just is saved in the goods.
One of purpose of the present invention is to obtain a sharp plastics self-reinforcing tubing;
Two of purpose of the present invention provides a kind of method for preparing plastics self-reinforcing tubing;
Three of purpose of the present invention provides a kind of method for preparing polyolefin self-reinforcing tubing;
Four of purpose of the present invention provides a kind of extrusion molding apparatus according to the above-mentioned purpose design, and this apparatus structure is simple, making is easy, cost is low, has a good application prospect.
In order to reach primary and foremost purpose of the present invention, can take a kind of like this technical solution, promptly in the extrusion molding process of tubing, produce shear action by plug with respect to the rotation of mouth mould and make macromolecular chain, and immediately the circumferential orientation of macromolecular chain is fixed along the pipe circumferential orientation.
Realize the polymer macromolecule chain along the pipe circumferential orientation, but also the through port mould reaches with respect to the shear action that the plug rotation produces.
Second and third purpose of the present invention then reaches by the following technical programs: promptly the melt along the pipe circumferential orientation that has formed in the extrusion molding section is cooled off gradually, this cooling can be stepless gradually, also can be that segmentation has level, but as long as be controlled to be in the temperature of mouth mould section with cooling temperature field: entrance point is the optimal process temperature of this kind plastics, the port of export is reduced to below the softening point of this kind plastics, and the orientation of melt macromolecular chain is fixed up.Other process conditions of extrusion molding section are controlled to be: the rotating speed of plug or mouthful mould is 3～50 rev/mins; Mould shunting mainboard temperature is the optimal process temperature of this kind plastics; Extrusion pressure is 2～30 MPas.
Used in order to make said method, also in order to reach last purpose of the present invention, the technical solution of extrusion molding apparatus provided by the invention comprises extruder, draws and expect joint, mould shunting mainboard, mouthful mould, plug, black box, bearing and bearing block, plug driving mechanism and typing haulage gear.Mould shunting mainboard links to each other with extruder by drawing the material joint.Mouthful mould is fixed on the mould shunting mainboard, has coolant guiding channel in its wall, and the cooling medium import and export is arranged on the channel outer wall, can feed cooling medium the melt tubing of extrusion molding is carried out cooling and shaping.In order to control mouthful chilling temperature of mould section, the outer surface of mouthful mould is equipped with heating and temperature controlling device.Plug is supported by bearing and bearing block, and the front portion is arranged in a mouthful mould die cavity, and the junction of bearing block and mould shunting mainboard is advanced in the bearing block along the plug backflow leakage to prevent melt by the black box sealing of assembling.The plug rear end links to each other with the plug driving mechanism.The typing haulage gear is positioned at a mouthful mould outlet the place ahead.
During use, polymer is introduced mould shunting mainboard by drawing the material joint after extruder melt extrudes, be divided into two strands of inlet port mould die cavitys up and down then, and plug is under driving mechanism drives, and rotation produces and shears in the die cavity melt, makes macromolecular chain along circumferential orientation.Mouthful mould comes regulating and controlling temperature by regulating cooling medium consumption and heating and temperature controlling device simultaneously, so that different cultivars, different melting points polymer are carried out cooling and shaping gradually, makes the big molecule of orientation generate the high strength condensed state structure, and the tubing circumferential strength is improved greatly.
Description of drawings:
Fig. 1 is the extrusion molding apparatus partial structurtes cutaway view of Britain UMIST;
Fig. 2 is the extrusion molding apparatus partial structurtes sketch of American I BM;
Fig. 3 is the extrusion molding apparatus partial structurtes cutaway view of Britain Bevis;
Fig. 4 is a self-reinforced plastic pipe extrusion molding apparatus partial structure sketch provided by the invention;
Fig. 5 is the sectional structure and the connection diagram of a kind of mouthful of modular form in apparatus of the present invention;
Fig. 6 is the sectional structure schematic diagram of plug in apparatus of the present invention.
Provide embodiment and the present invention is described in detail below in conjunction with accompanying drawing.
Embodiment one:
This example is the embodiment of plug with respect to the self-reinforced plastic pipe extrusion molding apparatus of mouth mould rotation.
This device mainly comprises extruder, draws and expect joint, mould shunting mainboard 1, mouthful mould 2, plug 9, black box 19, bearing and bearing block 20, plug driving mechanism and typing haulage gear, as shown in Figure 4.What the Yin Ben device adopted is the right-angle type extruder head, so extruder does not draw with drawing among the material joint figure.
Extruder is a screw extruder, and present embodiment adopts single screw extrusion machine, and it links to each other with mould shunting mainboard 1 through drawing the material joint.On the mould shunting mainboard 1 the pressure sensor probe is installed, in order to melt 29 pressure in the monitoring die cavity, so that adjust as required.
Mouth mould 2 is installed in mould shunting mainboard 1 outlet one side, and according to the requirement to melt 29 cooling velocities and mode, a mouthful mould 2 can be by constituting more than one section or two sections or two sections.When stepless gradually mode temperature adjustment was adopted in cooling, a mouthful mould 2 was one section.When cooling adopted segmentation that grade temperature adjustment is arranged, a mouthful mould 2 just was to constitute more than two sections or two sections.Take all factors into consideration from cooling effect, processing cost and control are complicated and simple, the best is three sections and constitutes.Present embodiment is three sections and constitutes, as shown in Figure 5.All have coolant guiding channel 3 in every section mouth mould 2 walls, this passage 3 is to be made of annular slab 30 welded seals that match at the inboard annular groove of opening around die cavity and of template plate face.Have cooling medium import and export 4 on the channel outer wall.For plastic melt 29 is cooled off gradually, on the outer ring surface of mouthful mould heating and temperature controlling device 5 is housed, to make it forming best thermograde, promote macromolecular oriented crystalline.The heating and temperature controlling device 5 of present embodiment is electric heating coil and three sections independent temperature adjustments.When adopting one section mouth mould, can reach by density or the cooling medium adverse current that electric heating coil twines for requiring stepless gradually cooling.For fear of occur excessive heat conduction greatly because of mouth mould 2 each intersegmental contact-making surface, influence the independent temperature control of each section mouth mould 2, all there is the projection 6 of an annular at the die cavity mouth place of every section mouth mould 2 connecting plate face inboards, and die cavity mouth place and the mould shunting mainboard 1 from nearer two sections mouth moulds, the 2 connecting plate faces outside of mould shunting mainboard 1 respectively has a ring-shaped step 7 recessed, that cooperate with the annular protrusion 6 of adjacent panels face inboard with mouth mould 2 junctions when wherein installing.These step 7 recessed degree of depth cooperate with annular protrusion 6, should make 1 of mainboard of 2 of each mouthful moulds and mould shunting except that projection 6, recessed ledge frame 7 places closely the contact, all the other areas do not contact, and have so both reduced heat conduction therebetween, have solved 2 location of each mouthful mould and sealing problem again.Each section mouth mould 2 and mould shunting mainboard 1 usefulness bolt 8 link together.
The plug driving mechanism is positioned at frame 21 bottoms, is made of motor 22, decelerator 23, chain 24 and sprocket wheel 25, sees Fig. 4.Motor 22 drives plug 9 rotations by decelerator 23, chain 24 and sprocket wheel 25.
The typing haulage gear is installed in mouthful mould 2 the place aheads, comprises typing cover 26 and hauling machine 28.Typing cover 26 is formed by relative flexible connection of nest plate level that two cross sections are " Ω " shape, and is installed on the frame 21 by support 27.Behind tubing extrusion neck ring mold 2, front end can stretch in the typing cover 26, support alignment by it on the one hand, to prevent the bending pipes distortion, can regulate the opening width of typing cover 26 along the connector on the limit by regulating the nest plate both sides on the other hand, thereby resistance is extruded in control, to produce different die cavity extrusion pressures.Hauling machine 28 is the general tubing hauling machine of market sale, is installed in typing cover frame 21 the place aheads.
This device also is applicable to fibre reinforced plastic tube processing, makes fiber along circumferential orientation, to increase its bearing strength.
Embodiment two:
Present embodiment and following examples are extrusion molding in the self-reinforcing tube extrusion molding device that embodiment one is provided all.The present embodiment raw material is a high density polyethylene (HDPE), and process conditions are as follows: three sections temperature of extruder barrel are respectively 120 ℃, 160 ℃, 200 ℃, 5 rev/mins of screw speeds; 230 ℃ of mould shunting mainboard temperature; Three sections die temperatures are respectively 120 ℃, 90 ℃, 80 ℃ from inside to outside; Extrusion pressure 8Mpa; Plug leads to cooling water, and its rotating speed is 20 rev/mins.The pipe circumferential strength that obtains is 110Mpa, and the common gained tubing circumferential strength of extruding only is 26Mpa.
Embodiment three:
The present embodiment raw material is a polypropylene, and process conditions are as follows: three sections temperature of extruder barrel are respectively 120 ℃, 180 ℃, 220 ℃, 6 rev/mins of screw speeds; 230 ℃ of mould shunting mainboard temperature; Three sections die temperatures are respectively 130 ℃, 100 ℃, 70 ℃ from inside to outside; Extrusion pressure 10Mpa; Plug leads to cooling water, 15 rev/mins of plug rotating speeds.The pipe circumferential strength that obtains is 58Mpa, and corresponding common extruding pipe circumferential strength is 31Mpa.
Embodiment four:
The present embodiment raw material is ABS, and process conditions are as follows: three sections temperature of extruder barrel are respectively 120 ℃, 160 ℃, 200 ℃, 5 rev/mins of screw speeds; 230 ℃ of mould shunting mainboard temperature; Three sections die temperatures are respectively 120 ℃, 80 ℃, 60 ℃ from inside to outside; Extrusion pressure 16 MPas; Plug leads to cooling water, 17 rev/mins of plug rotating speeds.The pipe circumferential strength that obtains is 54Mpa, and common extruding pipe circumferential strength is 46Mpa.
Embodiment five:
The present embodiment raw material is a polypropylene, and process conditions are as follows: three sections temperature of extruder barrel are respectively 100 ℃, 160 ℃, 200 ℃, 10 rev/mins of screw speeds; 172 ℃ of mould shunting mainboard temperature; Three sections die temperatures are respectively 52 ℃, 44 ℃, 30 ℃ from inside to outside; Extrusion pressure 10 MPas; Plug leads to cooling water, and its rotating speed is 23 rev/mins, pipe circumferential strength 80 MPas of acquisition.The circumferential strength of common extruding pipe is 33Mpa under this condition.
Technical scheme provided by the present invention is not limited to above embodiment, especially counterpart mould section cooling temperature field when control required mode of heating and mouthful mould length what are not strict with, as long as can make in the tubing macromolecular chain orientation and promote that crystallization reaches the self-reinforcing effect all right.
Compared with the prior art the present invention has the following advantages:
1, extruding forming method provided by the invention is simple, and the macromolecular chain that Mandrel Rotating is obtained is circumferentially got To and the high strength condensed state structure that generates at utmost be retained in the goods, thereby greatly improved tubing circumferentially from Strengthen effect.
2, the burst strength with the actual voltage-withstand test of Autofrettaged Tube of the inventive method preparation has reached 4.5 MPas, than common 3 MPas of extruding pipe have improved 50%, and this just means the fluid of carrying uniform pressure, and the wall thickness of Autofrettaged Tube can Reduce largely, can save a large amount of raw materials like this.
3, existing self-reinforcing mode has comparatively harsh requirement to plastic raw materials machine-shaping conditions and equipment, only Suitable molecular weight is very high, the polyolefin plastics that melt index (MI) is very low, and process needs very high pressure (500,000,000 Handkerchief) is difficult to realize suitability for industrialized production. And the present invention can be to common extrusion grade polyethylene (such as 5000s) in low pressure (2～30 MPa) the lower acquisition strengthens, and can extrusion molding on the common extruder that slightly makes improvements, and can realize suitability for industrialized production. This all is a breakthrough in theory still putting into practice.
4, Autofrettaged Tube extrusion molding apparatus provided by the invention is simple in structure, makes easily, and cost is low, has good Application prospect.
5, applied widely. This device not only can be used for various thermoplastics, can be used for simultaneously fiber reinforced thermolplastic Tube extrusion molding makes fiber along circumferential orientation, greatly improves its bearing strength.
Claims (8)
1, a kind of preparation method of self-reinforced plastic pipe, this method is in the extrusion molding process, rotate the shear action that produces by plug (9) with respect to plug (9) with respect to mouth mould (2) rotation or through port mould (2), make macromolecular chain along the pipe circumferential orientation, it is characterized in that simultaneously to fixing that macromolecular chain forms along the pipe circumferential orientation.
2, the preparation method of self-reinforced plastic pipe according to claim 1 is characterized in that to the mode of fixing along the pipe circumferential orientation that macromolecular chain forms it being that melt (29) to the extrusion molding section cools off gradually, makes it typing.
3, the preparation method of self-reinforced plastic pipe according to claim 2 is characterized in that:
1., the rotating speed of plug (9) or mouthful mould (2) is 3～50 rev/mins;
2., at mouth mould (2) section melt (29) is cooled off, cooling can be stepless gradually or segmentation have level to carry out, the cooling temperature field of mouthful mould (2) section makes melt (29) be reduced to below this kind plastics softening point of the port of export by this kind plastics optimal process temperature of entrance point.
4, the preparation method of self-reinforced plastic pipe according to claim 3 is characterized in that the process conditions of its extrusion molding are: mould shunting mainboard (1) temperature is the optimal process temperature of this kind plastics, and extrusion pressure is 2～30 MPas.
5, a kind of self-reinforced plastic pipe preparation facilities that designs according to preceding method, comprise extruder, draw material and squeeze head, mould shunting mainboard (1), mouth mould (2), plug (9), black box (19), bearing and bearing block (20), plug driving mechanism and typing haulage gear, mould shunting mainboard (1) links to each other with extruder by drawing the material joint, mouth mould (2) is fixed on the mould shunting mainboard (1), plug (9) is supported by bearing and bearing block (20), the front portion is arranged in a mouthful mould (2), the rear end links to each other with the plug driving mechanism, the connection place fitting tight assembly (19) of bearing block (20) and mainboard, the typing haulage gear is positioned at a mouthful mould (2) outlet the place ahead, it is characterized in that having coolant guiding channel (3) in a mouthful mould (2) wall, channel outer wall has cooling medium to advance, outlet (4) is equipped with heating and temperature controlling device (5) on the outer ring surface of mouthful mould (2).
6, self-reinforced plastic pipe preparation facilities according to claim 5, it is characterized in that a mouthful mould (2) is by constituting more than one section or two sections or two sections, the best is three sections, all there is an annular protrusion (6) at the die cavity mouth place of every section mouth mould (2) plate face inboard, wherein then there is a ring-shaped step recessed, that be mated (7) at the die cavity mouth place of two sections mouth moulds (2) face opposite side, coolant guiding channel (3) in the mouth mould (2) is an annular, the heating and temperature controlling device of adorning on its cooling medium import and export (4) and the outer ring surface all is separately independently, and heater is an electric heating coil.
7, self-reinforced plastic pipe preparation facilities according to claim 5, it is characterized in that plug (9) is the ladder hollow bar of a both ends open, be inlaid with cooling medium cover (10) in the caput, middle part, the cover end has tapped through hole (11), connect the cooling medium efferent duct (12) that is positioned at plug (9) postmedian cavity on it, efferent duct (12) tail end stretches out outside plug (9) cavity and drainage tube head (14) is dynamically connected, drainage tube head (14) cross section is " π " shape, have outlet (15) on the tube wall, the tube head middle part has through hole (16), cooling medium input pipe (13) passes this through hole (16), cantilever stretches in the cooling medium cover (10) with one heart from the cooling medium efferent duct (12) of plug (9) tail end, and cooling medium cover (10) port is sealed by a plug (18).
8, according to claim 5 or 6 or 7 described self-reinforced plastic pipe preparation facilities, the haulage gear that it is characterized in that finalizing the design comprises hauling machine (28) and can regulate the typing cover (26) and the support (27) thereof of head resistance that typing cover (26) is combined by the nest plate that two cross sections are " Ω " shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107852A CN1073922C (en) | 1997-12-31 | 1997-12-31 | Prepn. method and appts. for self-strengthening plastic pipe material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97107852A CN1073922C (en) | 1997-12-31 | 1997-12-31 | Prepn. method and appts. for self-strengthening plastic pipe material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1221675A CN1221675A (en) | 1999-07-07 |
| CN1073922C true CN1073922C (en) | 2001-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97107852A Expired - Fee Related CN1073922C (en) | 1997-12-31 | 1997-12-31 | Prepn. method and appts. for self-strengthening plastic pipe material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1073922C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100488752C (en) * | 2002-10-16 | 2009-05-20 | 天津理工学院 | Low-density polyethylene pipe self-reinforcing extruding noses |
| CN106493965B (en) * | 2016-10-21 | 2018-08-03 | 北京化工大学 | A kind of device and method of continuously elongated enhancing composite plastic pipe |
| CN107639807A (en) * | 2017-10-01 | 2018-01-30 | 深圳市普耐科技有限公司 | A kind of extrusion molding mould and system |
| CN111559098B (en) * | 2020-07-14 | 2020-11-20 | 上海百心安生物技术有限公司 | Circumferential strengthening device and method for polylactic acid pipe |
| CN115534263B (en) * | 2022-07-29 | 2023-10-17 | 宁波方力科技股份有限公司 | Plastic solid wall winding pipe production line and production process based on rotary die |
| CN118181704B (en) * | 2024-05-13 | 2024-07-19 | 华南理工大学 | Multi-cavity cold extrusion die |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5096634A (en) * | 1990-02-07 | 1992-03-17 | George Aristovoulos Petzetakis | Method of operating an apparatus for the production of biaxially stretched plastic tubes |
| CN1075908A (en) * | 1992-02-27 | 1993-09-08 | 清华大学 | A kind of pipe, wire rod pressed production line |
| WO1996006720A1 (en) * | 1994-08-29 | 1996-03-07 | Srp Industries Ltd. | Filler reinforced thermoplastic composites having biaxially oriented components |
| JPH09136344A (en) * | 1995-11-16 | 1997-05-27 | Sekisui Chem Co Ltd | Manufacture of tubular member |
-
1997
- 1997-12-31 CN CN97107852A patent/CN1073922C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5096634A (en) * | 1990-02-07 | 1992-03-17 | George Aristovoulos Petzetakis | Method of operating an apparatus for the production of biaxially stretched plastic tubes |
| CN1075908A (en) * | 1992-02-27 | 1993-09-08 | 清华大学 | A kind of pipe, wire rod pressed production line |
| WO1996006720A1 (en) * | 1994-08-29 | 1996-03-07 | Srp Industries Ltd. | Filler reinforced thermoplastic composites having biaxially oriented components |
| JPH09136344A (en) * | 1995-11-16 | 1997-05-27 | Sekisui Chem Co Ltd | Manufacture of tubular member |
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| Publication number | Publication date |
|---|---|
| CN1221675A (en) | 1999-07-07 |
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