CN102059799A - Production method for multilayer composite plastic pipes and production line thereof - Google Patents
Production method for multilayer composite plastic pipes and production line thereof Download PDFInfo
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Abstract
The invention discloses a production method for multilayer composite plastic pipes and a production line thereof. The production line comprises three-layer inner pipe coextrusion forming equipment, a winding machine, a cladding layer extruder and outer-layer foaming coextrusion forming equipment; and a plurality of devices are connected to form the production line, so at least seven layers of plastic pipes can be formed in one piece. The production method of the invention comprises the following steps of extruding the plastic pipes, adding an anti-oxidation layer, enhancing the winding of compression resistance, foaming an intermediate insulating layer and extruding anti-extruding outer-layer pipes, and the steps are finished continuously on one production line, so the continuous and automatic production is realized, the production efficiency is improved substantially, the labor strength is reduced and a large amount of energy is saved.
Description
Technical field
The invention belongs to plastic pipe production method, production equipment, be specifically related to a kind of production method and production line thereof that is used to produce the multilayer composite plastic heating tubing that contains heat-insulation layer.
Background technology
The heating aqueduct that the city central heating is used, many employing steel pipes are main, in order to solve the insulation problem of steel pipe, coat one deck insulation material in the steel pipe outside, there is following defective in the hot duct of this structure, 1. adopt steel pipe because of trunk line, trunk line is embedded in underground for a long time, is easy to be corroded, and therefore the service life of this hot duct is generally about year; 2. steel are good conductors of heat, in order to reduce heat waste, must increase the thickness of insulation material, the cost height; 3. make several meters long duct section when this hot duct is produced, when construction, again the plurality of conduits section is connected, expend lot of manpower and material resources, and joining place is damaged easily, directly the service life of influence heating aqueduct.
Plastic pipe is because of its long service life, can prevent environment infiltration, anti-extrusion, shock resistance, stretch-proof, counter-bending, corrosion-resistant, good antiscale property, can reach environmental protection low-carbon (LC) effect.In water transfer pipe network, more and more come into one's own, in recent years, public supply mains are registered one's residence and are partly generally adopted plastic pipe.It will be trend of the times that hot duct adopts plastic pipe, but simply adopt plastic tube to replace steel pipe and inadvisable, the plastics hot duct requires that enough big intensity is arranged, good heat-insulating property and convenient construction, also can save a lot of connecting tubes and recruitment time in work progress.And meet the requirements at aspects such as resistance to compression, corrosion resistant, insulations, must realize by specific special equipment and special producing method.
Summary of the invention
In order to solve the problems referred to above that the prior art field exists, the objective of the invention is to, a kind of multilayer composite plastic tubing production method and production line thereof are provided, can once finish the nearly production of the composite plastic heating tubing of at least seven layer materials such as pipe, outer tube and middle foaming layer in the multilayer composite plastic, increase substantially production efficiency, reduce labour intensity, and save a large amount of energy.
The name that the applicant applies on the same day is called multilayer composite plastic heating tubing patent, a kind of new type plastic pipe is provided, comprises 7 layers of structure, it comprises interior pipe, heat-insulation layer, outer tube, heat-insulation layer is made for the PU expanded material, and heat-insulation layer is filled between interior pipe and the outer tube.Pipe comprises 5 layers of structure in described, is followed successively by PE-RT internal layer, EVOH internal layer, PE-RT intermediate layer, fibrage, PE-RT skin from inside to outside, described 5 layers of airtight sticking together of structure, formation hard composite plastic pipe.Described outer tube is the PE-RT material, and its surface texture is that some annular protrusions are alternate with annular groove, and described annular protrusion and annular groove are toroidal or helical ring shape.
Wherein HDPE is a high density polyethylene (HDPE), and PU is a polyurethane, and PE-RT is a heat-proof polythene, and POY is a terylene, and EVOH is vinyl alcohol-copolymer.
Multilayer composite plastic tubing production method provided by the invention is used for producing above-mentioned 7 layers of composite plastic heating tubing, may further comprise the steps:
(1) 3 layer of compound interior pipe co-extrusion, batching: internal layer adopts the PE-RT material, and middle anti oxidation layer adopts EVOH and PE-RT composite material, and the mass ratio of EVOH and PE-RT is 1: 3, and skin adopts the PE-RT material.Heating co-extrusion: adopt the co-extrusion unit of forming by 3 plastic extruders, three shared co-extruding machine heads of extruder, extrude the PE-RT internal layer by the main extruder in the middle of being positioned at earlier, then, extrude the EVOH intermediate layer by a secondary extruder that is positioned at main extruder one side, at last extrude the PE-RT skin, extrude, once finish for above-mentioned three layers by co-extruding machine head by the secondary extruder that is positioned at opposite side.
Key process parameter: according to the tubing of producing different size, every layer of extruded velocity all changes (1), to guarantee the thickness of inner layer tube wall, the wall thickness of three layers of pipe material is 4: 2: 1 o'clock, internal layer, intermediate layer, outer extruded velocity successively decrease successively, and the rotating speed of extruder differs about 30-50 branch/commentaries on classics; (2) extrusion temperature: the temperature of the discharge barrel of extruder increases progressively successively by 165 ℃～180 ℃ from inside to outside, 165 ℃ in an about district, 175 ℃ in two districts, 175 ℃ in three districts, 180 ℃ in four districts, 180 ℃ in five districts; (3) head temperature is followed successively by 185 ℃ in a district, 185 ℃ in two districts, 190 ℃ in three districts from being fed to the output sizing; (4) extrusion pressure, inner tube 9Mpa, intermediate layer 4Mpa, outer 5Mpa.
(2) the three-layer plastic composite pipe blank that comes out from co-extruding machine head enters vacuum cooling tank, and the pipe after extruding is carried out sizing, cooling in advance.
Vacuum cooling tank length is 6 meters, and vacuum is distinguished 2 sections, and leading portion is 1 meter, evenly establishes 48 of spray water nozzles for the spray cooling, and according to the tubing of different size, vacuum pressure can reach 4-6Mpa.
(3) pipe through the cooling sizing enters coil winding machine, adopts positive and negative both direction to carry out spiral coiling, is wound in warp, parallel on the pipe surface, and the purpose of coiling is the compressive property that increases tubing.
Used line is the POY polyester thread, and he can be equal to mutually with the PA nylon wire, and polyester thread is lower than nylon wire price.The diameter of line can be according to the pipe material selection of different size, and the angle of general diameter 0.2-1mm. graticule according to pipe diameter, can form different angles through the regulation and control motor speed, generally can be adjusted to the 5-45 degree.
(4) pipe after coiling is finished residues in surperficial moisture when baking oven is removed cooling, again by a plastic overmold extruder, coat one deck PERT material on the surface, enters vacuum cooling tank after extruding, and cools off sizing simultaneously, exports 5 layers of composite plastic pipe.
(5) outer tube and foamed interlayer coextrusion mold: pipe enters outer tube foaming co-extruding machine head in the composite plastic, the extrusion molding surface has the PE-RT outer tube of spiral pattern and the PU expanded material between interior pipe and the outer tube, and the foaming muzzle of foaming machine extend into the diameter-setting equipment and the extruder head junction of head and foams.
Key process parameter: (1) PU polyurethane, A batch can curing agent, B batch can conditioning agent is in harmonious proportion at 1: 1, regulates metering by melt metering pump, the control foamed time; (2) foaming density by air compressor gas, is carried out tolerance and is controlled and regulate foaming density; (3) temperature environment is between the PU blowing agent adapts to 20-40 ℃; (4) skin is extruded and sizing, the outer tube extruder, and it matches sizing between negative-pressure vacuum 0.2-0.5Mpa with corresponding spiral head.According to caliber size, the low vacuum pressure of adjusting of crest height of wave, just can produce the outer spiral tubing of stretch-proof, anti-pressure ability.
(6) at last tubing is drawn by caterpillar-tractor,, wait for then transporting the job site to by the winder rolling.
The present invention also provides a kind of multilayer composite plastic pipe production line, cooperate and realize aforementioned production method, this production line comprises pipe coextrusion mold equipment in three layers, outer tube foaming coextrusion mold equipment, pipe coextrusion mold equipment comprises pipe co-extrusion unit, co-extruding machine head, vacuum cooling tank, drying baker in three layers in three layers, and outer tube foaming coextrusion mold equipment comprises foaming machine, outer tube extruder, outer tube foaming co-extruding machine head; Pipe co-extrusion unit comprises three plastic extruders in described three layers, be connected on the co-extruding machine head, the output of co-extruding machine head connects vacuum cooling tank, cooler bin connects drying baker again, outer tube extruder, foaming machine connect outer tube foaming co-extruding machine head, and outer tube foaming co-extruding machine head connects another vacuum cooling tank, hauling machine, winder successively.It also comprises the coiling unit, described coiling unit is arranged on manages in three layers between coextrusion mold equipment and the outer tube foaming coextrusion mold equipment, comprise coil winding machine, clad extruder, clad extruder head, described coil winding machine connects clad extruder, clad extruder head.
Described outer tube foaming co-extruding machine head comprises extruder head, foam gun, diameter-setting equipment, and foam gun is arranged between the plug and inner tube of extruder head, and muzzle extend into the junction of diameter-setting equipment and handpiece body, and the foam gun input is connected with foaming machine.Described diameter-setting equipment comprises a motor, and motor connects diameter-setting equipment by sprocket wheel, and the diameter-setting equipment inboard is fixed with the sizing mould, and the sizing mould can rotate with diameter-setting equipment, and the inner surface of described sizing mould is provided with helical groove or projection.Described extruder head comprises handpiece body, extruder junctor, interior plug, mouthful mould, mouthful die mandrel, and described interior mandrel surface is provided with current limliting slope, the current limliting groove of annular, leaves the gap between current limliting slope and the handpiece body.It also comprises fairlead, and between plug and the inner tube, inner tube can be slided in fairlead in described fairlead was fixedly installed on.
The mouth mould sizing mechanism that the co-extruding machine head of pipe coextrusion mold equipment comprises handpiece body and is positioned at conveyor screw feeding mechanism, the mixing of materials mechanism of handpiece body and fixedlys connected with handpiece body in described three layers, described conveyor screw feeding mechanism comprises inside spin body, intermediate conveyor screw body, external spiral body, described three conveyor screw suit settings successively connect the machine neck of three plastic extruders respectively; Described conveyor screw is a cylindrical structure, and the surface has helicla flute.Described mixing of materials mechanism comprises interior plug, leaves the space between interior plug and the handpiece body, and interior plug one end is fixedlyed connected with the inside spin body, and the other end is fixedlyed connected with the sizing plug.Described mouthful of mould sizing mechanism comprises that a mouthful mould, sizing plug, plug connect leading screw, the sizing plug is arranged in mouthful mould, leaves the sizing space between the two, and plug connects leading screw and is arranged in the sizing plug, plug connects leading screw fixedlys connected with interior plug, and a mouthful mould is fixedly connected on the handpiece body.
Multilayer composite plastic tubing production method provided by the invention and production line thereof, its beneficial effect is, realized the one-shot forming production of at least 7 layers of plastic pipe, plastic tube extrude, anti oxidation layer adds, the coiling, middle heat-insulating layer foaming, the anti-extrusion outer tube that strengthen compressive property extruded, on a production line, finish continuously, realized serialization, automated production, increase substantially production efficiency, reduce labour intensity, and save a large amount of energy.
Description of drawings
Fig. 1 is a pipe coextrusion mold device structure schematic diagram in three layers of the embodiment of the invention;
Fig. 2 is the coiling unit structural representation of the embodiment of the invention;
Fig. 3 is the outer tube foaming coextrusion mold device structure schematic diagram of the embodiment of the invention;
Fig. 4 is the structural representation of co-extruding machine head among Fig. 1;
Fig. 5 is the structural representation of Fig. 3 ectomesoderm pipe foaming co-extruding machine head.
Mark among the figure:
1-1. pipe co-extrusion unit in three layers; 1-2. co-extruding machine head; 1-3. vacuum cooling tank; 1-4. drying baker; 1-5. coil winding machine; 1-6. the clad extruder head, 1-7. clad extruder; 1-8. vacuum cooling tank; 1-9. outer tube extruder; 1-10. foaming machine; 1-11. outer tube foaming co-extruding machine head; 1-12. vacuum cooling tank; 1-13. hauling machine; 1-14. winder.
2-1. handpiece body; 2-2. internal layer extruder machine neck; 2-3. intermediate layer extruder machine neck; 2-4. outer extruder machine neck; 2-5. charging junctor; 2-6. the inside spin body, 2-7. intermediate conveyor screw body; 2-8. external spiral body; 2-9. interior plug; 2-10. mouthful mould; 2-11. sizing plug; 2-12. plug connects leading screw.
3-1. extruder junctor; 3-2. foam gun; 3-3. interior plug; 3-4. handpiece body; 3-5. current limliting slope; 3-6. the current limliting groove, the 3-7. diameter-setting equipment; 3-8. sizing mould; 3-9. foaming layer; 3-10. inner layer plastic tube; 3-11. outer layer plastic tube; 3-12. mouthful mould; 3-13. mouthful die mandrel; 3-14. fairlead.
The specific embodiment
With reference to the accompanying drawings, in conjunction with an embodiment, multilayer composite plastic tubing production method provided by the invention and production line thereof are described in detail.
Embodiment
The multilayer composite plastic tubing production method of present embodiment may further comprise the steps:
(1) 3 layer of compound interior pipe co-extrusion, batching: internal layer adopts the PE-RT material, and middle anti oxidation layer adopts EVOH and PE-RT composite material, and the mass ratio of EVOH and PE-RT is 1: 3, and skin adopts the PE-RT material.Heating co-extrusion: adopt the co-extrusion unit of forming by 3 plastic extruders, three shared co-extruding machine heads of extruder, extrude the PE-RT internal layer by the main extruder in the middle of being positioned at earlier, then, extrude the EVOH intermediate layer by a secondary extruder that is positioned at main extruder one side, at last extrude the PE-RT skin, extrude, once finish for above-mentioned three layers by co-extruding machine head by the secondary extruder that is positioned at opposite side.
Key process parameter: (1) is according to the tubing of producing different size, every layer of extruded velocity all changes, to guarantee the thickness of inner layer tube wall, the wall thickness of three layers of pipe material of present embodiment is 4: 2: 1, internal layer, intermediate layer, outer extruded velocity, successively decrease successively, the rotating speed of extruder differs about 40 minutes/commentaries on classics; (2) extrusion temperature: the temperature of the discharge barrel of extruder increases progressively successively by 165 ℃～180 ℃ from inside to outside, 165 ℃ in an about district, 175 ℃ in two districts, 175 ℃ in three districts, 180 ℃ in four districts, 180 ℃ in five districts; (3) head temperature is followed successively by 185 ℃ in a district, 185 ℃ in two districts, 190 ℃ in three districts from being fed to the output sizing; The division in three districts is that a district is the conveyor screw feeding part in the handpiece body, and two districts are interior plug pressurized mixing portion, and three districts are a mouthful die mandrel moulding output; (4) extrusion pressure, inner tube 9Mpa, intermediate layer 4Mpa, outer 5Mpa.
(2) the three-layer plastic composite pipe blank that comes out from co-extruding machine head enters vacuum cooling tank, and the pipe after extruding is carried out sizing, cooling in advance.
The vacuum cooling tank length that present embodiment adopts is 6 meters, and vacuum is distinguished 2 sections, and leading portion is 1 meter, is the spray cooling, evenly establishes 48 of spray water nozzles, and vacuum pressure is 5Mpa.
(3) pipe through the cooling sizing enters coil winding machine, adopts positive and negative both direction to carry out spiral coiling, is wound in warp, parallel on the pipe surface, and the purpose of coiling is the compressive property that increases tubing.
Used line is the POY polyester thread, and he can be equal to mutually with the PA nylon wire, and polyester thread is lower than nylon wire price.The diameter of line can be according to the pipe material selection of different size, general diameter 0.2-1mm, and present embodiment adopts 0.5mm, and the angle of graticule according to pipe diameter, can form different angles through the regulation and control motor speed, generally can be adjusted to the 5-45 degree, and present embodiment adopts 30 degree.
(4) pipe after coiling is finished, when removing cooling, baking oven residues in the moisture on surface, again by a plastic overmold extruder, coat one deck PERT material on the surface, enter vacuum cooling tank after extruding, cool off sizing simultaneously, export 5 layers of composite plastic pipe, the POY polyester thread that is wrapped in three layers of tube-surface is covered by clad, further increases the intensity of product.
(5) outer tube and foamed interlayer coextrusion mold: pipe enters outer tube foaming co-extruding machine head in the composite plastic, the extrusion molding surface has the PE-RT outer tube of spiral pattern and the PU expanded material between interior pipe and the outer tube, and the foaming muzzle of foaming machine extend into the diameter-setting equipment and the extruder head junction of head and foams.
Key process parameter: (1) PU polyurethane, A batch can curing agent, B batch can conditioning agent is in harmonious proportion at 1: 1, regulates metering by melt metering pump, the control foamed time; (2) foaming density by air compressor gas, is carried out tolerance and is controlled and regulate foaming density; (3) temperature environment is between the PU blowing agent adapts to 20-40 ℃; (4) skin is extruded and sizing, the outer tube extruder, and it matches sizing between negative-pressure vacuum 0.2-0.5Mpa with corresponding spiral head.According to caliber size, the low vacuum pressure of adjusting of crest height of wave, just can produce the outer spiral tubing of stretch-proof, anti-pressure ability.
(6) at last tubing is drawn by caterpillar-tractor,, wait for then transporting the job site to by the winder rolling.
With reference to Fig. 1-Fig. 5, the multilayer composite plastic pipe production line of present embodiment cooperate to realize that aforementioned production method, this production line comprise pipe coextrusion mold equipment in three layers-see Fig. 1, coiling unit-see Fig. 2, outer tube foaming coextrusion mold equipment-see Fig. 3.Pipe coextrusion mold equipment comprises pipe co-extrusion unit 1-1, co-extruding machine head 1-2, vacuum cooling tank 1-3, drying baker 1-4 in three layers in described three layers, pipe co-extrusion unit 1-1 comprises three plastic extruders in described three layers, be connected on the co-extruding machine head 1-2, the output of co-extruding machine head connects vacuum cooling tank 1-3, and cooler bin connects drying baker 1-4 again.Described coiling unit is arranged on manages in three layers between coextrusion mold equipment and the outer tube foaming coextrusion mold equipment, comprise coil winding machine 1-5, clad extruder 1-6, clad extruder head 1-7, described coil winding machine 1-5 connects clad extruder 1-6, clad extruder head 1-7, vacuum cooling tank 1-8.Outer tube foaming coextrusion mold equipment comprises foaming machine 1-10, outer tube extruder 1-9, outer tube foaming co-extruding machine head 1-11; Outer tube extruder 1-9, foaming machine 1-10 connect outer tube foaming co-extruding machine head 1-11, and outer tube foaming co-extruding machine head connects another vacuum cooling tank 1-12, hauling machine 1-13, winder 1-14 successively.
Under the effect of hauling machine 1-13, pipe in coextrusion mold and the cooled three layers of composite plastic, through coil winding machine 1-5, clad extruder head 1-7, vacuum cooling tank 1-8, become pipe in 5 layers of composite plastic, again through outer tube foaming co-extruding machine head 1-11, vacuum cooling tank 1-12, finally become seven layers of complex heat-preservation plastics heating tubing, be wound into the dish warehouse-in by winder 1-14 at last.
Described outer tube foaming co-extruding machine head 1-11 comprises extruder head, foam gun, diameter-setting equipment, foam gun 3-2 is arranged between the plug 3-3 and inner layer plastic tube 3-10 of extruder head, muzzle extend into the junction of diameter-setting equipment 3-7 and handpiece body 3-4, and the input of foam gun 3-2 is connected with foaming machine 1-10.Described diameter-setting equipment 3-7 comprises a motor, motor connects diameter-setting equipment by sprocket wheel, diameter-setting equipment 3-7 inboard is fixed with sizing mould 3-8, and sizing mould 3-8 can rotate with diameter-setting equipment 3-7, and the inner surface of described sizing mould 3-8 is provided with helical groove or projection.Described extruder head comprises handpiece body 3-4, extruder junctor 3-1, interior plug 3-3, mouthful mould 3-12, mouthful die mandrel 3-13, and current limliting slope 3-5, current limliting groove 3-6 that described interior plug 3-3 surface is provided with annular leave the gap between current limliting slope 3-5 and the handpiece body 3-4.It also comprises fairlead 3-14, and between plug 3-3 and the inner layer plastic tube 3-10, inner layer plastic tube 3-10 can slide in fairlead 3-14 in described fairlead 3-14 was fixedly installed on.Inner layer plastic tube moves ahead under the effect of hauling machine, expanded material enters handpiece body and diameter-setting equipment junction by the foam gun of foaming machine, in outer tube extrusion molding, foam, form uniform foaming layer 3-9, outer layer plastic tube 3-11, because the sizing mould is provided with helical groove, the outer layer plastic tube-surface is the spiral lamination structure, has strengthened the compressive property of outer tube.
The mouth mould sizing mechanism that the co-extruding machine head 1-2 of pipe coextrusion mold equipment comprises handpiece body 2-1 and is positioned at conveyor screw feeding mechanism, the mixing of materials mechanism of handpiece body and fixedlys connected with handpiece body in described three layers, described conveyor screw feeding mechanism comprises inside spin body 2-6, intermediate conveyor screw body 2-7, external spiral body 2-8, described three conveyor screw suit settings successively connect machine neck 2-2,2-3, the 2-4 of three plastic extruders respectively; Described conveyor screw is a cylindrical structure, and the surface has helicla flute.Plug 2-9 in described mixing of materials mechanism comprises leaves the space between interior plug 2-9 and the handpiece body 2-1, and interior plug 2-9 one end is fixedlyed connected with inside spin body 2-6, and the other end is fixedlyed connected with sizing plug 2-11.Described mouthful of mould sizing mechanism comprises that a mouthful mould 2-10, sizing plug 2-11, plug connect leading screw 2-12, sizing plug 2-11 is arranged in mouthful mould 2-10, leave the sizing space between the two, plug connects leading screw 2-12 and is arranged in the sizing plug 2-11, plug connects leading screw 2-12 and fixedlys connected with interior plug 2-9, mouth mould 2-10 is fixedly connected on the handpiece body 2-1, and charging junctor 2-5 is connected between the machine neck 2-3 of handpiece body 2-1 and middle extruder, the outer extruder machine neck 2-4.
Claims (10)
1. multilayer composite plastic tubing production method may further comprise the steps:
(1) 3 layer of compound interior pipe coextrusion mold, (1) batching: internal layer adopts the PE-RT material, and middle anti oxidation layer adopts EVOH and PE-RT composite material, and the mass ratio of EVOH and PE-RT is 1: 3, and skin adopts the PE-RT material; (2) heating co-extrusion: adopt the co-extrusion unit of forming by 3 plastic extruders, three shared co-extruding machine heads of extruder, extrude the PE-RT internal layer by the main extruder in the middle of being positioned at earlier, then, extrude the intermediate layer by a secondary extruder that is positioned at main extruder one side, at last extrude the PE-RT skin, extrude, once finish for above-mentioned three layers by co-extruding machine head by the secondary extruder that is positioned at opposite side;
(2) the three-layer plastic composite pipe blank that comes out from co-extruding machine head enters vacuum cooling tank, and the pipe after extruding is carried out sizing, cooling in advance, vacuum pressure 4-6Mpa;
(3) outer tube and foamed interlayer coextrusion mold: pipe enters outer tube foaming co-extruding machine head in the composite plastic, the extrusion molding surface has the PE-RT outer tube of spiral pattern and the pu expanded material between interior pipe and the outer tube, and the foaming muzzle of foaming machine extend into the diameter-setting equipment and the extruder head junction of head and foams.
2. multilayer composite plastic tubing production method according to claim 1, it is characterized in that: also comprise the coiling step, this step is carried out after above-mentioned steps (two) is finished, pipe through the cooling sizing enters coil winding machine, adopt positive and negative both direction to carry out spiral coiling, be wound in warp, parallel on the pipe surface, line and pipe axial line are 5-45 degree angle during coiling; Pipe after coiling is finished residues in surperficial moisture when baking oven is removed cooling, again by a plastic overmold extruder, coat one deck PERT material on the surface, enters vacuum cooling tank after extruding, and cools off sizing simultaneously, exports 5 layers of composite plastic pipe.
3. multilayer composite plastic tubing production method according to claim 1, it is characterized in that: in the step (), key process parameter: (1) is according to the tubing of producing different size, every layer of extruded velocity all changes, to guarantee the thickness of inner layer tube wall, the wall thickness of three layers of pipe material is 4: 2: 1 o'clock, internal layer, intermediate layer, outer extruded velocity, successively decrease successively, the rotating speed of extruder differs about 30-50 branch/commentaries on classics; (2) extrusion temperature: the temperature of the discharge barrel of extruder increases progressively successively by 165 ℃～180 ℃ from inside to outside, 165 ℃ in an about district, 175 ℃ in two districts, 175 ℃ in three districts, 180 ℃ in four districts, 180 ℃ in five districts; (3) head temperature is followed successively by 185 ℃ in a district, 185 ℃ in two districts, 190 ℃ in three districts from being fed to the output sizing; (4) extrusion pressure, inner tube 9Mpa, intermediate layer 4Mpa, outer 5Mpa.
4. multilayer composite plastic tubing production method according to claim 1 is characterized in that: in the step (three), and key process parameter: (1) PU polyurethane, A batch can curing agent, B batch can conditioning agent is in harmonious proportion at 1: 1, regulate metering by melt metering pump, the control foamed time; (2) foaming density by air compressor gas, is carried out tolerance and is controlled and regulate foaming density; (3) temperature environment is between the PU blowing agent adapts to 20-40 ℃; (4) skin is extruded and sizing, the outer tube extruder, and it matches sizing between negative-pressure vacuum 0.2-0.5Mpa with corresponding spiral head.
5. realize the multilayer composite plastic pipe production line of multilayer composite plastic tubing production method according to claim 1 for one kind, it is characterized in that: it comprises pipe coextrusion mold equipment in three layers, outer tube foaming coextrusion mold equipment, pipe coextrusion mold equipment comprises pipe co-extrusion unit, co-extruding machine head, vacuum cooling tank, drying baker in three layers in three layers, and outer tube foaming coextrusion mold equipment comprises foaming machine, outer tube extruder, outer tube foaming co-extruding machine head; Pipe co-extrusion unit comprises three plastic extruders in described three layers, be connected on the co-extruding machine head, the output of co-extruding machine head connects vacuum cooling tank, cooler bin connects drying baker again, outer tube extruder, foaming machine connect outer tube foaming co-extruding machine head, and outer tube foaming co-extruding machine head connects a vacuum cooling tank, hauling machine, winder successively.
6. multilayer composite plastic pipe production line according to claim 5, it is characterized in that: it also comprises the coiling unit, described coiling unit is arranged on manages in three layers between coextrusion mold equipment and the outer tube foaming coextrusion mold equipment, comprise coil winding machine, clad extruder, clad extruder head, described coil winding machine connects clad extruder, clad extruder head.
7. multilayer composite plastic pipe production line according to claim 5, it is characterized in that: described outer tube foaming co-extruding machine head comprises extruder head, foam gun, diameter-setting equipment, foam gun is arranged between the plug and inner tube of extruder head, muzzle extend into the junction of diameter-setting equipment and handpiece body, and the foam gun input is connected with foaming machine.
8. multilayer composite plastic pipe production line according to claim 5, it is characterized in that: the mouth mould sizing mechanism that the co-extruding machine head of pipe coextrusion mold equipment comprises handpiece body and is positioned at conveyor screw feeding mechanism, the mixing of materials mechanism of handpiece body and fixedlys connected with handpiece body in described three layers, described conveyor screw feeding mechanism comprises inside spin body, intermediate conveyor screw body, external spiral body, described three conveyor screw suit settings successively connect the machine neck of three plastic extruders respectively; Described conveyor screw is a cylindrical structure, and the surface has helicla flute.
9. according to claim 5 or 7 described multilayer composite plastic pipe production lines, it is characterized in that: described extruder head comprises handpiece body, extruder junctor, interior plug, mouthful mould, mouthful die mandrel, mandrel surface is provided with current limliting slope, the current limliting groove of annular in described, leaves the gap between current limliting slope and the handpiece body.
10. according to claim 5 or 7 described multilayer composite plastic pipe production lines, it is characterized in that: it also comprises fairlead, and between plug and the inner tube, inner tube can be slided in fairlead in described fairlead was fixedly installed on.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108458207A (en) * | 2018-04-16 | 2018-08-28 | 六安中财管道科技有限公司 | A kind of special tubing of heat-insulating integral solar energy and processing technology |
| CN115071188A (en) * | 2022-05-12 | 2022-09-20 | 临海伟星新型建材有限公司 | Deep geothermal heat-insulation composite pipeline and preparation method thereof |
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| CN108458207A (en) * | 2018-04-16 | 2018-08-28 | 六安中财管道科技有限公司 | A kind of special tubing of heat-insulating integral solar energy and processing technology |
| CN115071188A (en) * | 2022-05-12 | 2022-09-20 | 临海伟星新型建材有限公司 | Deep geothermal heat-insulation composite pipeline and preparation method thereof |
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