WO2010029142A2 - Procédé et dispositif de refroidissement de profilés en plastique - Google Patents

Procédé et dispositif de refroidissement de profilés en plastique Download PDF

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Publication number
WO2010029142A2
WO2010029142A2 PCT/EP2009/061781 EP2009061781W WO2010029142A2 WO 2010029142 A2 WO2010029142 A2 WO 2010029142A2 EP 2009061781 W EP2009061781 W EP 2009061781W WO 2010029142 A2 WO2010029142 A2 WO 2010029142A2
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
tool
cooling
profile
melt
Prior art date
Application number
PCT/EP2009/061781
Other languages
German (de)
English (en)
Other versions
WO2010029142A3 (fr
Inventor
Leopold Hackl
Josef Dobrowsky
Georg Zacher
Miron I. Gorilovskiy
Original Assignee
Cincinnati Extrusion Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cincinnati Extrusion Gmbh filed Critical Cincinnati Extrusion Gmbh
Publication of WO2010029142A2 publication Critical patent/WO2010029142A2/fr
Publication of WO2010029142A3 publication Critical patent/WO2010029142A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • B29C48/337—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location
    • B29C48/338—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging at a common location using a die with concentric parts, e.g. rings, cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material

Definitions

  • the invention relates to an extrusion line for the production of plastic profiles, preferably plastic pipes, comprising at least one extruder, a tool, a calibration and further downstream devices.
  • the invention relates to a method for increasing the cooling performance of an extrusion line for extruding a plastic profile, in particular a plastic tube comprising the steps of: a) melting plastic in an extruder, b) molding a plastic strand and feeding the plastic strand to a tool, c) forming a plastic profile by means of the tool, d) calibrating and curing by cooling the profile in a calibration, wherein in addition to the external cooling in the calibration, the profile is cooled in the interior.
  • DE 69 403 693 proposes to provide the inner wall of the tube with a spray and thereby to achieve evaporation of the liquid on the inner wall of the tube and thus cooling.
  • such cooling has not proved to be practical since the hot steam is carried along in the extrusion direction and thus aids in the cooling of the pipe in the calibration, but then at the end of the extrusion line, for example in the area of the saw, the pipe keeps a temperature, so that this is dimensionally stable, but too soft for the separation process.
  • plastic is melted in an extruder and pressed by a corresponding tool.
  • the outer diameter produced in this way is frozen and, in water spray baths or full baths, the heat is removed from the plastic via the outer surface.
  • the entire heat must be conducted through the plastic wall to the outside, where it is then derived from the cooling water.
  • the cooling length is disproportionately longer, since the plastic is a poor conductor of heat.
  • the temperature inside the tube remains at a high level for a long time and the plastic has sufficient time to roll down due to gravity. The consequence is that the pipe wall thickness in the upper area is always smaller than in the lower area.
  • the plasticized plastics material can be supplied and has a plurality of annular channels, which are combined to form a common melt channel. Cooling channels are arranged around these ring channels.
  • DE 10 2005 031 747 Al a method for internal cooling of hollow plastic profiles and an extruder for producing hollow plastic profiles are known. In this case, the internal cooling is achieved in that a cooling gas is passed into the interior of the hollow profile, wherein the cooling gas is generated in a Ranqueschen vortex tube.
  • the object of the present invention is to provide an extrusion line and a method in which the heat can be dissipated as uniformly as possible over the entire wall thickness of the pipe, the cooling capacity being increased in the extrusion line, with the aim of increasing the output or to shorten the cooling section, or increased in the process, the cooling capacity and thus either increases the output or the cooling section can be shortened.
  • the solution of the object with respect to the extrusion line is characterized in that at least the tool has at least one opening and, viewed in the extrusion direction, an extraction is arranged in front of the tool, by means of which air is exchanged inside the plastic profile can and the tool consists of several functional areas with separate melt channels, by means of which the plastic melt can be divided into partial melts and the temperature of the melt can be reduced.
  • This countercurrent principle has the advantage that in comparison to the tube temperature at the end of the extrusion line colder air is sucked through the inside of the tube counter to the extrusion direction. This air warms up on the way through the tube on the tube inner wall, wherein the tube temperature also increases counter to the extrusion direction. Thus, there is always a temperature difference between the air and pipe inner wall, resulting in a permanent heat flow from the pipe into the air.
  • the breakthrough can be formed by means of a guided through the tool tube. So that a temperature separation between the actual tool and the breakthrough, ie the inserted tube, is formed, it is provided according to the training that there is an air gap between the tube and the tool. Depending on the nature of the tool and several breakthroughs may be present.
  • the above-mentioned functional areas are not necessarily to be regarded as closed areas, they can flow smoothly into one another and thus also overlap.
  • the breakthrough is also in the extruder, wherein the suction viewed in the extrusion direction is arranged in front of the extruder.
  • the further extension of the Breakage from the tool and in the extruder allows a more flexible design of the suction device itself, since the suction can be arranged in the relatively free space of the extrusion line and does not have to be placed between the extruder and the tool.
  • the volume flow is regulated and / or controllable. It is thus possible to adapt the suction device to the respective extrusion conditions.
  • the corresponding strength of the suction process can thus be adapted to the respective temperature conditions and thus the cooling requirement during the process. The more cooling capacity is required, the larger or stronger the flow rate is.
  • the extraction system can be operated intermittently. It is thus sucked a time tl air, possibly in the turbulent range, followed by a period t2, where not sucked off (annealing time). The heat can thus migrate from the middle of the pipe wall to the inside again, which makes the pipe on the inside warmer again. This is followed again by a time interval t 1 in which the heat is extracted. The entire process can be repeated several times.
  • This method is advantageous in order to extrude very thick-walled tubes void-free.
  • the solution of the problem with respect to the method is characterized in connection with the preamble of claim 7, characterized in that for internal cooling of the profile, the air against the extrusion Onsplatz is sucked by means of suction and supportive of the plastic strand is divided into several partial strands in the tool and so the temperature of the melt is reduced before exiting the tool.
  • the temperature can be reduced by at least 1O 0 C to 5O 0 C
  • the temperature is at least 2O 0 C and 4O 0 C, preferably at 3O 0 C, lowered.
  • the temperature of the plastic melt is lowered at least in the transition region between the melt state and partially crystalline state in semicrystalline plastics or in the transition region between the melt state and glass state in amorphous plastics, it being important to ensure that the decrease in temperature takes place only to the extent that a weld between the individual layers is ensured.
  • This reduction in temperature can be assisted by a countercurrent process, in which the heat generated inside the tube is sucked through the tool.
  • the plastic melt flows through three functional areas, with the three functional areas flowing into one another in a flowing manner.
  • the melt or a melt Particles on the one hand still in the distribution area but also already in the cooling area. The same applies to the transition between the cooling area and the shaping area.
  • the proposed method and the device according to the invention are particularly suitable for producing thick-walled tubes.
  • the air volume between the suction and the end of the extrusion line is exchanged at least once, preferably twice per minute. It is therefore proposed that the volume of air within the entire pipe area within the extrusion line, ie from the extraction via the extruder or the tool along the calibration and the trigger or other downstream equipment to the separation device at which the entire profile strand is cut to length, accordingly often replace it to achieve optimum cooling performance.
  • the separating device at least in the region of the wall thickness in which it cuts the plastic pipe in its entirety, to perform a non-cutting separation in order to prevent chips from being sucked in the direction of the tool by means of the suction then these shavings inside the tube in the Area in which the pipe is still too warm on the surface can adhere.
  • the proposed extrusion line and the proposed method are particularly suitable for thick-walled plastic pipes and pipes with large to very large diameters, the residence time is within the extrusion line in the hour range, so it is relatively large.
  • the cooling capacity is increased in an extrusion line, which is associated with two significant advantages.
  • the overall cooling length is shortened if one leaves an existing output power unchanged, or one can increase the output power if the entire cooling length is maintained.
  • Output and cooling length are physically related to the cooling time.
  • the cooling time depends on the cooling capacity. By increasing the cooling capacity and thus reducing the cooling time, as described above, with constant output, the cooling section can be shortened or the output can be increased while the cooling section remains the same.
  • an extrusion line is offered for a certain output.
  • the extrusion line according to this invention is then shorter than a line known in the art (Example A).
  • Example B a higher output can be achieved on the inventive line
  • Example B Comparing two lines with the same size extruder according to Example A, then the according to the prior art would build longer than the line according to the present invention.
  • Example B two lines with the same cooling distance are compared, those that are the same According to the prior art, has a smaller extruder, that corresponding to the invention has a larger extruder.
  • Fig. 3 shows the article according to Figure 2 in an alternative embodiment
  • Calibration 3 comprises a vacuum tank with built-in calibration sleeve. The calibration can also be followed by additional cooling baths.
  • a separator in the form of a saw 5 follows.
  • a tube 9 is manufactured.
  • the suction 6 is arranged directly on the tool at the beginning of the extrusion line.
  • the corresponding suction direction is indicated schematically by the arrow.
  • the tool 2 has an opening 8, the opening 8 communicates with the suction 6 in connection, so that the suction 6 the air Volume in the interior of the tube 9 can suck through to the end of the extrusion line in the region of the separator 5.
  • the extruder 1 in which the extruder 1 is arranged laterally on the tool 2, it is not necessary that the extruder 1 also has an opening 8 for the suction of the air from the interior of the tube 9.
  • FIG. 2 shows a tool 2 according to the invention.
  • the middle part of the tool 2 consists of a plurality of annular channels 13, which unite at a confluence point 12 and form the beginning of the common melt channel 10.
  • the individual annular channels 13, which communicate with supply channels 14, are supplied with plasticized plastic material from the extruder 1, which is not shown in this figure.
  • cooling channels 11 are arranged, which are in communication with a cooling circuit, also not shown.
  • the cooling channels are arranged so that they can extract heat from the existing material mass of the tool as evenly as possible.
  • the tool thus divides into the three functional areas distribution area 15, to which the melt from the extruder or extruders at the points A, B, C is supplied to the feed channels 14, and is divided into the annular channels 13, cooling area 16, in which the annular channels 13 are provided with cooling channels 11, and the shaping area 18, in which the pre-cooled melt merges, on.
  • an opening 8 is provided in the tool 2 by means of a tube. Between the tube 8 and the actual tool 2, an air gap 18 is provided for temperature separation.
  • FIG. 3 shows an alternative embodiment of the invention. It differs from the execution gem. Figure 2, characterized in that the supply of the melt centrally, that is, only via an extruder.
  • the central part of the tool 2 consists of a plurality of annular channels 13, which unite at the confluence point 12 and form the beginning of the common melt channel 10.
  • the individual annular channels 13 are connected to the feed channels 14 in connection. It can clearly be seen that the feed channels 14 are centrally impinged by an extruder 1, not shown, and then split between the three spiral distributors. Again, 13 cooling channels 11 are arranged between the annular channels, which are in communication with a cooling circuit, also not shown.
  • the cooling channels are again arranged so that they can extract heat as evenly as possible from the existing material mass of the tool.
  • the tool 2 divides into the three functional areas distribution area 15, cooling area 16 and shaping area 18.
  • an opening 8 is provided by means of a tube in the tool 2 for dissipating the heat from the interior of the tube.
  • an air gap 18 is again provided for temperature separation.
  • each annular channel 13 can be acted upon with one and the same plastic compound or with different plastic masses.
  • the feed channel 14 is to be modified so that each feed channel is associated, for example, with its own extruder 1. It can thus be produced, for example, different color layers in the pipe or two materials with different properties can be made. It is thus, for example, possible to apply to the middle part with a recyclate, which is then enclosed in the finished part from both sides with higher quality material.
  • FIG. 4 schematically shows a curve of a semicrystalline and an amorphous plastic, the specific volume v being shown above the temperature T.
  • the illustrated solid line 22 is an example of the semi-crystalline material and the dashed line 23 for an amorphous plastic.
  • the temperature of the melt state represented in the region 21, is cooled at least into the transition region 20, but the cooling does not take place so strongly that the solids region 19 is reached.
  • a partially crystalline state prevails in semicrystalline plastics and a glass state in the case of amorphous plastics.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une ligne d'extrusion de profilés en plastique, de préférence de tubes en plastique, comportant au moins une extrudeuse (1), un outil (2), un dispositif d'étalonnage (3) ainsi que d'autres dispositifs (4, 5) montés en aval. Selon l'invention, l'outil (2) au moins présente au moins un passage, un dispositif d'aspiration (6) est monté en amont de l'outil (2), vu dans le sens de l'extrusion (7), et l'outil (2) comporte plusieurs zones de fonctionnement avec des canaux de matière fondue séparés. L'invention porte également sur un procédé destiné à augmenter la puissance de refroidissement d'une ligne d'extrusion d'un profilé en plastique, notamment d'un tube en plastique, ce procédé comportant les opérations suivantes : a) fonte de matière plastique dans une extrudeuse (1), b) façonnage d'un boyau en plastique et amenée du boyau en plastique vers un outil (2), c) façonnage d'un profilé en plastique au moyen de l'outil (2) et d) étalonnage et durcissement du profilé par refroidissement dans un dispositif d'étalonnage (3), dans lequel le profilé (9) est refroidi intérieurement en plus du refroidissement externe. Selon l'invention, pour le refroidissement interne du profilé (9), l'air est aspiré dans le sens contraire au sens d'extrusion (7) par un dispositif d'aspiration (6), le boyau en plastique étant subdivisé en plusieurs parties dans l'outil (2) et la température de la matière fondue étant réduite avant la sortie de l'outil (2).
PCT/EP2009/061781 2008-09-15 2009-09-10 Procédé et dispositif de refroidissement de profilés en plastique WO2010029142A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008047208.5 2008-09-15
DE102008047208.5A DE102008047208B4 (de) 2008-09-15 2008-09-15 Extrusionslinie, Verfahren zum Kühlen von Kunststoffprofilen und Kunststoffrohr

Publications (2)

Publication Number Publication Date
WO2010029142A2 true WO2010029142A2 (fr) 2010-03-18
WO2010029142A3 WO2010029142A3 (fr) 2010-07-08

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DE (1) DE102008047208B4 (fr)
WO (1) WO2010029142A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2407297A1 (fr) * 2010-07-15 2012-01-18 battenfeld-cincinnati Germany GmbH Procédé et dispositif de nettoyage de l'air de refroidissement lors de l'extrusion de pièces en plastique
CN107214925A (zh) * 2017-07-13 2017-09-29 安徽蓝通科技股份有限公司 一种pvc管快速挤出模具
CN112622233A (zh) * 2020-12-07 2021-04-09 苏州杰威尔精密机械有限公司 厚壁管生产系统

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WO1997038844A1 (fr) * 1996-04-17 1997-10-23 Conenor Oy Procede et systeme de refroidissement d'un produit creux extrude
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2407297A1 (fr) * 2010-07-15 2012-01-18 battenfeld-cincinnati Germany GmbH Procédé et dispositif de nettoyage de l'air de refroidissement lors de l'extrusion de pièces en plastique
CN107214925A (zh) * 2017-07-13 2017-09-29 安徽蓝通科技股份有限公司 一种pvc管快速挤出模具
CN112622233A (zh) * 2020-12-07 2021-04-09 苏州杰威尔精密机械有限公司 厚壁管生产系统

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