• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A thick-walled, seamless, rigid non-porous conduit (Y) having a substantially uniform wall thikkness which is not less than about 0.5 percent of the outside diameter consisting essentially of an oriented crystalline thermoplastic polymer characterized by a structure comprised of radially compressed discrete, platelet-like spherulitic crystalline aggregates (A!) and having a combination of good ultimate tensile strength and low temperature tensile impact strength. The conduit is fabricated by solid state hydrostatic extrusion of a substantially non-oriented semi-crystalline thermoplastic polymer preform (X) which may contain up to about60 weight percent filler. The polymer is substantially simultaneously elongated in both circumferential and axial directions by compressive forces with the circumferential elongation being at least 100 percent. The apparatus used to produce the product is a hydrostatic extrusion press which includes an annular orifice in which the thermoplastic polymer is elongated substantially simultaneously circumferentially and axially with the circumferential elongation being at least 100 percent. Means for maintaining the rigidity of tooling and the hydrostatic extrusion fluid pressure while providing a film of the fluid on the preform for lubricity are provided in the apparatus. A sheet (F) substantially uniform in thickness and having substantially the microstructure and properties of the conduit and excellent drawability may be made from the conduit by slitting and heat deformation. Articles of manufacture may be made by solid state deformation processing of the conduit or the sheet, such as vacuum drawing.
    公开号:SU1163801A3
    申请号:SU802923398
    申请日:1980-05-07
    公开日:1985-06-23
    发明作者:Р.Остен Альфред；В.Хамфриз Даррэл
    申请人:Бетлехем Стил Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    Sealing means in the container unit to maintain the pressure of the hydrostatic fluid and ensure that the film of the hydrostatic fluid is pressed onto the workpiece, characterized in that, in order to improve the quality of the tubes by obtaining an oriented structure of the tubes, it is provided with a receiving unit arranged coaxially with the container assembly and elongating means for receiving the extrudate, means for lubricating and cooling the extruded billet in the receiving unit, with a mandrel forming an annular with the working surface of the mouthpiece a gap having a sequentially located conical inlet zone, a cylindrical sealing zone, a conical expansion zone, a cylindrical calibration zone and transition zones with smooth transition surfaces, the calibration zone of the annular gap parallel to its sealing zone, and a cross-section of the annular gap in the calibration zone
    less than its cross section in the sealing zone is selected and the average diameter of the annular gap in the calibration zone is chosen at least 100% larger than the average diameter of the annular gap in the sealing zone,
    10. The apparatus of claim 9, wherein the average diameter of the annular gap in the calibration zone is selected to be at least 20.0% larger than its average diameter in the sealing zone.
    11. The device of claim 9, wherein the angle between the axis of the device and the working surface of the mouthpiece is selected from 15 to 45, and the angle between the axis of the device and the working surface of the mandrel is selected from 50 to 20.
    12. The device according to claim 9, about the fact that the angle between the axis of the device and the working surface of the mouthpiece is selected 30 °, and the angle between the axis of the device and the working surface of the mandrel is selected 40 ..
    The invention relates to the processing of thermoplastic materials and can be used in the manufacture of thick-walled seamless pipes, sheets and products obtained from a pipe or sheet with improved characteristics by solid-phase hydrostatic extrusion.
    A known method for the manufacture of plastic tubular products, comprising pushing through the mandrel of a billet of thermoplastic polymer under the action of the pressure of the plunger ij.
    The disadvantage of this method is that tubular products consisting of thermoplastic polymers are incapable and cannot be adapted to expand the polymer by at least 100% in the circumferential direction to ensure compression type deformation. A known process for the production of hoses or elongated tubular products is related to melt extrusion or plasticization processes, which result in unoriented products.
    Stretching or stretching causes non-uniform deformation of spherulitic crystalline aggregates in the polymer structure. Spherulites are destroyed and tilted. Microcavities, microfibrils and fibrils are formed.
    The resulting products are highly oriented in the circumferential direction, but have defects formed in the structure.
    The closest to the invention to the technical essence and the achieved result is a method of making a thick-walled seamless rigid pipe from an undirected semi-crystalline thermoplastic
    in a solid state of a polymer preform through an extrusion zone with an elongation of the preform at least 50% in the axial direction and with lubrication of the polymer surface with a hydrostatic liquid 2j,
    The apparatus for carrying out the method comprises means for fastening the tooling, a container unit housed within the means for attaching a tooling, means for generating pressure in the container unit, sealing means in the container unit for maintaining the pressure of the hydrostatic liquid and providing extrusion of the hydrostatic film on the workpiece.
    The disadvantage of this method is that it does not provide simultaneous high-quality expansion in the circumferential direction by at least 100% and in the axial direction by at least 50% of the workpiece, orientation of its structure and workpiece preparation in the solid state with simultaneous expansion and elongation by using hydrostatic pressure.
    The purpose of the invention is to improve the quality of the pipes by obtaining the oriented structure of the pipes.
    The goal is achieved in that according to the method of manufacturing a thick-walled seamless rigid pipe from a non-oriented semi-crystalline thermoplastic polymer by hydroextrusion in the solid state of a polymer preform through an extrusion zone with an elongation of the preform at least 50% in the axial direction and with the lubricant surface of the polymer hydrostatic fluid, the preform is expanded at least 100% in the circumferential direction when the polymer is heated under load from the temperature of deformation heat resistance to a temperature lower than the melting point of the thermoplastic polymer
    In addition, the circumferential elongation of the workpiece is at least 200%, and the axial elongation is chosen equal to the circumferential elongation of the workpiece.
    Polymer. Heated under load
    4.64 gks / cm to a temperature of 8 or 18-30 ° C lower melting point thermoplastic polymer. ra.
    Polymer billet is cut in the manufacture of a split pipe and the pipe is cut.
    A device for making
    0 of the method comprising means for fastening tooling, a container unit housed within means for fastening the tooling equipment, means for generating pressure in the container unit, sealing means in the container unit for maintaining the pressure of the hydrostatic liquid and providing a film of the hydrostatic liquid. , is provided with a receiving unit located coaxially with the container unit, extension means for receiving the extrudate, means for lubricating
    5 and cooling the extruded billet in the receiving unit with a mandrel forming an annular gap with the working surface of the mouthpiece, having successively located conical inlet zone, cylindrical sealing zone, conical expansion zone, cylindrical calibration zone and transitional areas with smooth surfaces
    5 transitions, with the calibration zone of the annular gap parallel to its sealing zone, and the cross section of the annular gap in the calibration zone is chosen less than
    0 cross-section in the sealing zone and the average diameter of the annular gap in the calibration, the area selected at least 100% greater than the average diameter of the annular
    5 clearance in the sealing zone.
    The average diameter of the annular gap in the calibration zone is selected at least 200% larger than its average diameter in the sealing zone.
    In the expansion zone, the angle between the axis of the device and the working surface of the tool is selected from 15 to -45 or 30, and the angle between the axis of the device and the working surface of the mandrel is selected from 50 to 20 or 40.
    FIG. 1 shows a device for carrying out the method at the beginning
    The process of hydrostatic extrusion, cut FIG. 2 - the same, extruded billet; on ig. 3 gasket with slits, top view; in fig. 4 - gasket with grooves, top view; in fig. 5 embodiment of the device for the semi-continuous hydrostatic extrusion process; in fig. 6 -. device after extrusion; in fig. 7 - heating tank, section.
    A device for carrying out the method comprises a cylindrical outer housing 1, press means fastened thereto with the help of a thread, consisting of cylinders 2 and 3. The cylinder 2 is made with a cavity 4 and an axial bore 5. The hollow cylindrical piston 6 is placed in cavity 4 with the possibility of passing 1 force the plug 7. The pressure is fed to the piston 6 from a source (not shown) through the pipe 8.
    In the cavity of the cylindrical outer housing 1 there is a cylindrical bushing 9 coaxially arranged thereto, formed with a channel 10 for depressurizing the cavity 11 during extrusion. The cavity 1I is filled with a larger cross-sectional area than the intermediate cavity 12.
    . To center on the piston rod 6, the plug 7 is provided with a protrusion in the lower part. The plug 7 also has a groove 13, in which a 0-ring 14 is fitted to preserve the integrity of the extrudate preparation assembly during assembly. The top surface plugs 7 are made with a cylindrical protrusion 15 having a V-shaped cross section ..
    The hollow cylindrical piston 16 is staked on the plug 7 and the piston head 17 is located inside it. The circular gasket 18 of the elastomer is installed to create a seat of the cylindrical piston head 17 and also seals the cavity 19. The cylindrical protrusion 15 of the plug 7 is made to center the piston head 17. For preventing the leakage of fluid, the cylindrical piston 16 is provided with sealing means 20. In the end part of the cylindrical mouthpiece 9, a mandrel 21 is installed with the formation of an annular gap 22 with a working surface awesome mind 9.
    The annular gap 22 has a conical inlet 23, a cylindrical sealing 24, a conical expansion 25 and a cylindrical calibration 26 zone, interconnected by smooth surfaces
    transitions. The calibration zone 26 of the annular gap 22 is parallel to its sealing zone 24, and the cross section of the annular gap 22 in the calibration zone 26 is selected
    its smaller cross section in the sealing zone 24. The average diameter of the annular gap 22 in the calibration and calibration zone 26 is at least 100% larger.
    the average diameter in the sealing zone 24. In addition, the average diameter of the annular gap 22 in the calibration zone 26 is selected at least 200% greater than its average diameter in the sealing zone 24.
    In the expansion zone 25, the angle between the axis of the device and the working surface of the mouthpiece 9 is selected from 15 to 45, and the angle between the axis
    device and the working surface of the mandrel 21 is selected from 50 to 20 °. Preferably, the angle between the axis of the device and the working surface of the mouthpiece 9 was selected 30,
    and the angle between the axis of the device and the working surface of the mandrel 21 40.
    The extrudate receiving unit contains a shell 27 and a cylindrical hollow mandrel 28 installed in its cavity. Radial holes 29 are made at the lower end of the mandrel 28 and the upper end of the mandrel 28 is threaded 30. At the lower part, the shell 27 is made with radial holes 31. Between the inner the surface of the shell 27 and the outer surface of the mandrel 28 is formed by a chamber 32 for extruding the polymer. The mandrel 28 is separated from the mandrel 21
    gasket 33 with grooves 34,
    communicated with apertures 29 for communicating the cavity of the mandrel 28 with the chamber 32.
    . The circular support plate 35 is made with an outer diameter equal to the outer diameter of the shell 27. Between the support plate 35 and the piston 36
    7,
    A gasket 38 with slots 39 is installed in the hydraulic / cylinder 3 and the hollow plug 37.
    A pipe unit 40 is provided to introduce the lubricating or cooling fluid. The plug 37 is installed to form a channel 41 for the lubricating or cooling medium.
    The device variant shown in FIG. 5-7 refers to a semi-continuous process. This device contains an open-top rectangular tank 42 for hydrostatic and lubricating fluid. The piston 43 is configured to move through the opening 44 in the wall of the tank 42. To prevent leakage of hot fluid, a seal 45 is provided. One end of the piston 43 is attached (not shown) to the hydraulic means. A spring 47 is mounted in the cavity 46. The working surface of the mouthpiece 48 consists of molds 49, a second mold 50 and an intermediate 51 zones. The latter zone connects zones 49 and 50. The mouthpiece 48 is installed in the opening 52 of the side wall of the tank 42. In the cavity 53 of the mouthpiece 48 a mandrel head 54 is installed with a recess 55 in which the mandrel 56 is mounted to prevent any movement of the mandrel head 54. The other end of the mandrel 56 communicates with a hydraulic cylinder (not shown). The mandrel 56 is mounted with the possibility of free movement through the opening 57 in the separation plate, 58.
    The sloped slope 59 (Fig. 7) is complete for feeding the preform 60 into the heated liquid. The workpiece 60 is fed with the fingers of the handpiece 61.
    The method of manufacturing a pipe is carried out as follows.
    A semi-crystalline thermoplastic polymer blank, for example from an isotactic polypropylene, is inserted into the mouthpiece 9 so that the outer surface of the blank contacts to the forming surface. The nose portion of the mandrel 21 is inserted into the hole of the workpiece to ensure a tight fit. In a container unit wash down a certain amount of hydrostat-. It is put in a custard fluid, such as castor oil. .bake
    63801.8
    (not shown) and heated to a temperature between the temperature of deformation heat resistance under a load of 4.64 kgf / cm and a temperature 5 which is lower than the experimental melting point of the polymer, for example, in the case of polypropylene, the temperature is 129 C. The piston head 17 and the gasket 18 are preheated .
    to the same temperature. After the desired temperature has been reached, the piston head 17 and the gasket 18 are inserted into the lower part of the piston 16.
    5 The plug 7 and the ring 14 are also heated to the desired temperature and the protrusion 15 is inserted into the piston 16. At-about. The knot with mandrel 21 is also heated. The mandrel 21 center.
    0 The hydraulic cylinder 3 is screwed in place in the open upper end of the body I. The tube assembly 40 is placed in place and connected to a source of fluid, for example
    5 compressed air which is introduced into the receiving unit. A hydraulic pressure of 633 kgf / cm is created by using a hydraulic cylinder 3, which clamps the press under a load of 26.6 x 10 N (30 tf), and prevents lateral and axial movement of the mandrel 2 and other tooling in the press during extrusion. At the same time, the hydraulic pressure is supplied to the piston 6.
    cylinder 2, which in turn transfers pressure to the plug 7 and the hollow piston 16 and creates a fluid pressure. Initially, the liquid and the workpiece are compressed by the force generated in the cylinder 2. When the workpiece and the liquid are fully compressed to a pressure of about 520 kgf / cm or more, it starts with extrusion. The pressure remains relatively constant throughout the entire extrusion time.
    During extrusion, a portion of the hydrostatic fluid forms a thin film between the surfaces of the workpiece and the surfaces of the mandrel 21 and the mouthpiece 9, respectively, providing lubrication of the workpiece during its extrusion. Lubricating and cooling fluid, preferably air under pressure, for example, from 2.81 to 6.33 kgf / cm is fed into the chamber 32 cavity
    9
    mandrels 28 and radial holes 29. Air forms a flowing film or pad between the extrudate and the surface of the mandrel 21 in order to lubricate the extrudate.
    The fluid passes along the cavity of the mandrel 28 and the chamber 32 to the radial holes 31 to cool the extrudate. Then the medium flows through the channel 41 and exits the device through the upper part of the hydro cylinder 3.
    The use of a lubricating and cooling fluid provides a smooth, wrinkle-free surface and walls of the product of uniform thickness. After some time, for example, about a minute, after the billet is extruded, the hydraulic pressure in the hydraulic cylinders 2 and 3 is released. The hydraulic cylinder 3 is removed from the device. The receiving unit and the extrudate are removed from the press. The part of the preform remains non-extruded and remains on Amendment 21. The extrudate is separated from the non-extruded part by a cutting tool, such as a shearing knife (not shown).
    When implementing the method (figure 5, the liquid is heated internally or by external means, for example, a heating plate (not shown), to a temperature that corresponds to the interval from the deformation heat resistance temperature under a load of 4.64 kgf / cm to a temperature that is 8 C below the experimental temperature polymer melting. A partially extruded billet holds the mandrel head 54 in place during product ejection and when placed in place of the heated billet for extrusion.
    The extrudate is removed from the mandrel 56 by withdrawing it through the opening 57. The extrudate is removed from the apparatus.
    6 shows the workpiece in lanes 53. Pressure is applied to the workpiece by means of a piston 43 under the action of a hydrostatic fluid. The workpiece is first compressed until a pressure is reached at which the workpiece starts to be squeezed onto the mandrel 56. The workpiece is lengthened by one 163801
    ten
    temporarily in circumferential and axial directions. The expansion in the circumferential direction is at least 100% and preferably at least 200%. The axial elongation may be less than the circumferential expansion, but it is preferable that the axial elongation be at least 50%, and preferably 100% of the circumferential expansion.
    You can use a solid billet and mandrel of various shapes and sizes.
    In all cases, the workpiece must be extruded in solid
    condition and at the same time be extended both in the circumferential and axial directions with a circumferential expansion of about 100% (preferably 200%). The circumferential and axial elongation of the thermoplastic polymer preform is controlled by the converging cross-sectional area and divergence of the annular opening through which the extrusion of the preform is performed,
    In all cases of extrusion, an increase in the inner and outer diameters of the pipe blank should be sufficient to expand the average mass circumference of the polymer by at least 100%.
    (preferably 200%).
    The part of the press in which the billet head is assembled and the hydrostatic fluid is supplied is heated to a temperature in the range of temperature.
    deformation heat resistance under a load of 4.64 kgf / cm to a temperature that is 8 ° C below the experimental melting point
    polymer The experimental melting point of the polymer is the temperature at which the polymer is melted and it is no longer in the crystalline state. The experimental melting point varies for each polymer, so the temperature to which each thermoplastic polymer is heated to extrude also varies.
    The thermoplastic polymer is extruded under pressure and at a deformation rate, which correspond to the current practice of extrusion and help to eliminate surface separation, loss of size control and melting of the thermoplastic polymer. During extrusion, temperature, pressure, strain rate and degree of elongation are interdependent factors, so if the three parameters are specified, the fourth is fixed. The maximum extrusion rate is a function of the temperature at which the extrusion occurs, and the degree of elongation of the thermoplastic polymer. The extrusion rate can be expressed as the average strain rate, which is defined as the product of circumferential and axial elongation divided by the time required for the thermoplastic polymer to pass through the expansion zone. For example, the highest strain rate observed for successful extrusion of a hollow billet of isotactic polypropylene, which has an outer diameter of 2.54 cm and a length of 12.7 cm, a wall thickness of 0.67 cm, at a temperature in the pipe that has outer diameter of 5.08 cm, length. 17.78 cm and a wall thickness of 0.14 cm with a coefficient of circumferential expansion of 2.6 and an axial elongation factor of 1.9, is 8 s. Under practical conditions, it is possible to extrude a billet of isotactic polypropylene. Into a pipe having a diameter of 40j64 cm with strain rate of 6.7 s, which gives a performance of about 10,884 kg / h. The thermoplastic polymer is extruded along a conical die head through an annular opening j formed by the outer surface of the mandrel head and the mouthpiece surface. Although the mandrel head and the mouthpiece have divergent geometry, the annular opening formed by their divergent surfaces has a convergent cross-sectional area. Thereby, the polymer expands simultaneously to approx. The shaft is axially elongated and leads to a pipe that has a larger outer diameter, a longer length and a smaller thickness in the cross-sectional area; wall than the original blank. The divergence of the annular hole regulates the circumferential expansion or elongation, while the convergence of the surfaces of the hole, i.e. convergence of the cross-sectional area, controls axial deformation or elongation. Example 1. The rods of isotactic polypropylene and the homopolymer of the Moplena brand D 004W are obtained by melt extrusion and mechanical treatment with an outer diameter of 2.54 cm. The polymer has a density of 0.909, a crystallinity of 68.3%, an experimental melting point of 168c, a melt flow index of 0, 4 dg per minute, an ultimate tensile strength of 387 kgf / cm and an impact strength of 3.55 J / cm at 24 s. The rods are divided into blanks 12.7 cm long and drilled to produce an axial bore of 1.2 cm. The billet is placed in the billet placement unit and 69 ml of castor oil are poured. A straight end of a mandrel with a diameter of 1.27 cm is inserted under load into the hole of the workpiece. Surfaces of the mandrel and mouthpiece are formed by holes having converging walls, convergent cross-sectional area and divergent diameter, having an entrance part with an inner diameter of 1.27 cm and an outer diameter of 2.51 cm and an outlet part with an inner diameter of 5.08 cm and an outer diameter of 5.32 cm. The unit for placing the workpiece is placed in a furnace and held for 160 minutes to heat all parts and materials of the node to 129 ° C. The assembly is removed from the furnace and placed in a batch extrusion apparatus and the extrusion apparatus is assembled for extrusion. The pressure on the workpiece transmitted by using castor oil is increased from 0 to 600 kgf / cm, at which the workpiece is extruded through the hole in the extrudate receiving unit. In this example, the extrudate is not affected and is not cooled by the fluid introduced into the extrudate chamber. The polymer is somewhat reduced, which leads to a thickening of the wall and a decrease in the length of the product. However, signs of wrinkles are not observed and the wall has a uniform thickness that does not vary by more than + 10% along the length or circumference of the product. The pipe has a length of 13.9 cm, an outer diameter of 4.94 cm, an internal diameter of 4.76 cm (1.875 in.} And a wall thickness of 0.089 cm. About 5.08 cm of polymer remains in the workpiece assembly. The wall thickness is 1.8 % of outer diameter. The circumferential elongation is 2.6 or 160%, and the axial elongation is 2.6 or 160%.
    Samples are cut out of the pipe for testing strength I impact strength when stretched in the circumferential and axial directions. The test results are given in the table.
    Oriented circumferential ultimate strength is equal to 766 kgf / cm, 1.9 times higher than unoriented circumferential ultimate strength of 387 kgf / cm. Oriented circumferential impact viscosity on stretching is 38 J / cm - at, 8.2 times the circumferential impact strength at stretching equal to 4.6 J / cm when
    for neorientiro 10900 32,9x10
    7660,20x10
    )
    134 003.2xIO
    9640,23x10
    )
    bathroom tubing manufactured using the well-known plasticization method. .
    Pipe samples are polished, herbal and ist
    follow with the help of the proposed method. The microstructure consists of lamellar or va tteobrazny spherolitic crystalline aggregates when observed on the surface of the radial plane of the pipe. When observed on transverse surfaces, the microstructure exhibits relatively thin plates, elongated in the circumferential and axial directions, and oriented in the plane of the pipe.
    The use of the invention will make it possible to obtain various products by deforming the workpieces in the solid state, the microstructure of which is devoid of microcavities and fibrils.
    180 38
    310 65
    / Li:
    d
    Phage. 2
    .38
    f JJ
    FIG
    FIG.
    / ////////// 7 //// Z / 7yZ // Z // //////,
    60 60 60 ff /
    FIG. 7
    权利要求:
    Claims (12)
    [1]
    1. A method of manufacturing a thick-walled seamless rigid pipe from an undirected semi-crystalline thermoplastic polymer by hydroextrusion in the solid state of a polymer billet through an extrusion zone with elongation of the billet by at least 50% in the axial direction and lubricating the polymer surface with hydrostatic liquid, characterized in that, in order to increase pipe quality by obtaining an oriented pipe structure, the workpiece is expanded by at least 100% in the circumferential direction when the polymer is heated under narrow deflection temperature of the temperature to a temperature below the melting point of the thermoplastic polymer.
    [2]
    2. The method according to claim 1, characterized by the fact that the circumferential elongation of the workpiece is at least 200%.
    [3]
    3. The method according to claim 1, characterized by the fact that the axial elongation is chosen equal to the circumferential elongation of the workpiece.
    [4]
    4. The method according to claim 1, characterized in that the polymer is heated under a load of 4.64 kgf / cm 2 to a temperature 8 ° C lower than the melting temperature of the thermoplastic polymer.
    [5]
    5. The method according to claim 1, characterized in that the polymer is heated to a temperature 18-30 ° C lower than the melting temperature of the thermoplastic polymer.
    [6]
    6. The method according to claim 1, characterized by the fact that the polymer eago. the cut is cut during manufacture; split pipe.
    [7]
    7. The method according to π.1, with the fact that the pipe is cut.
    [8]
    8. The method according to PP. 6 and 7, characterized in that the pipe is additionally pressed during heating to obtain a sheet product.
    [9]
    9. A device for producing a thick-walled seamless rigid pipe from an undirected semi-crystalline thermoplastic polymer containing means for fastening a tooling, a container assembly located within the means for fastening a tooling, means for creating pressure in the container assembly,
    ... SU .... 1163801 sealing means in the container assembly for maintaining the pressure of the hydrostatic fluid and for squeezing the film of hydrostatic fluid onto the workpiece, characterized in that, in order to improve the quality of the pipes by obtaining an oriented pipe structure, it is equipped with a receiving unit, located coaxially with the container assembly, extension means for receiving the extrudate, means for lubricating and cooling the extruded billet in the receiving assembly, a mandrel forming with the working surface of the mouthpiece to face gap having a conical inlet zone in series, a cylindrical sealing zone, a conical expansion zone, a cylindrical calibration zone and transition zones with smooth transition surfaces, the calibration zone of the annular ί gap parallel to its sealing zone, and the cross section of the annular gap in less than its cross section in the sealing zone is selected in the calibration zone and the average diameter of the annular gap in the calibration zone is selected at least 100% large the average diameter of the annular gap in the sealing zone.
    [10]
    10. The device according to claim 9, characterized in that the average diameter of the annular gap in the calibration zone is selected at least 200% larger than its average diameter in the sealing zone.
    [11]
    11 The device according to claim 9, wherein the expansion zone has an angle between the axis of the device 1 'and the working surface of the mouthpiece from 15 to 45, and the angle between the axis of the device and the working surface of the mandrel is selected from 50 to 20 °.
    [12]
    12. The device according to claim 9, wherein the angle between the axis of the device and the working surface of the mouthpiece is selected 30 °, and the angle between the axis of the device and the working surface of the mandrel is selected 40 ..
    类似技术:
    公开号 | 公开日 | 专利标题
    US4282277A|1981-08-04|Oriented, semi-crystalline polymer product and method and apparatus for producing such product
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    US3354506A|1967-11-28|Apparatus for melt extrusion of multi-wall plastic tubing
    US3719209A|1973-03-06|Arcuate tubular articles of rigid plastic
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    US4876051A|1989-10-24|Apparatus and method for extruding and expanding polytetrafluoroethylene tubing and the products produced thereby
    KR950000191B1|1995-01-11|Method and apparatus for the production of ribbed pipes
    US3929960A|1975-12-30|Method for producing oriented plastic shotshells
    US4341827A|1982-07-27|Biaxially oriented thermoplastic polymer film and method of manufacture
    HU206468B|1992-11-30|Method and apparatus for producing ribbed tubes
    SU1163801A3|1985-06-23|Method of manufacturing thick-walled seamless rigid pipe from unoriented semicrystalline thermoplastic polymer and device for effecting same
    US5169587A|1992-12-08|Process for extruding large oriented polymer shapes
    US4150087A|1979-04-17|Tube of thermoplastics with thickened end
    US2620515A|1952-12-09|Extrusion method and apparatus
    US3433862A|1969-03-18|Method of forming articles from thermoelastically deformable materials
    EP0194869A2|1986-09-17|Method of forming highly oriented thermoplastic articles
    US3649148A|1972-03-14|Apparatus for parison extrusion
    US5004578A|1991-04-02|Process and apparatus for producing hollow bodies of thermoplastic material
    WO2005023517A1|2005-03-17|Method and device for blow-forming containers
    US4159889A|1979-07-03|Method of and apparatus for treating the outer surface and inner surface of a pipe of a thermoplastic resinous material produced by extrusion
    US4363611A|1982-12-14|Apparatus for hydrostatic extrusion of thermoplastic polymers
    US4449904A|1984-05-22|Apparatus for the hydrostatic extrusion of thermoplastic polymers
    EP0208055A1|1987-01-14|Apparatus for producing double-walled plastic pipes
    US4209484A|1980-06-24|Method of manufacturing products of cross-linked thermoplastic material
    US3461503A|1969-08-19|Molding
    同族专利:
    公开号 | 公开日
    IN153380B|1984-07-14|
    AU5066779A|1981-03-12|
    AT13991T|1985-07-15|
    BE878663A|1980-03-07|
    JPS55500631A|1980-09-11|
    AU529132B2|1983-05-26|
    IT7925578D0|1979-09-10|
    IL58173A|1983-03-31|
    DK200580A|1980-05-08|
    WO1980000550A1|1980-04-03|
    RO80954A|1983-02-01|
    EP0016817A1|1980-10-15|
    EP0016817A4|1983-02-09|
    IT1123576B|1986-04-30|
    ZA794757B|1980-09-24|
    JPH027821B2|1990-02-21|
    IL58173D0|1979-12-30|
    CA1149564A|1983-07-12|
    DE2967475D1|1985-08-01|
    EP0016817B1|1985-06-26|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US94111678A| true| 1978-09-08|1978-09-08|
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