WO2023214310A1 - Anneau de refroidissement pour appareil de production de films soufflés en plastique - Google Patents

Anneau de refroidissement pour appareil de production de films soufflés en plastique Download PDF

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Publication number
WO2023214310A1
WO2023214310A1 PCT/IB2023/054565 IB2023054565W WO2023214310A1 WO 2023214310 A1 WO2023214310 A1 WO 2023214310A1 IB 2023054565 W IB2023054565 W IB 2023054565W WO 2023214310 A1 WO2023214310 A1 WO 2023214310A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
perturbating
elements
cooling ring
hollow body
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IB2023/054565
Other languages
English (en)
Inventor
Gabriele Caccia
Paolo Rizzotti
Matteo SAPONARA
Luca DE BERNARDI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Syncro SRL
Original Assignee
Syncro SRL
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 Syncro SRL filed Critical Syncro SRL
Priority to EP23728429.4A priority Critical patent/EP4519060A1/fr
Publication of WO2023214310A1 publication Critical patent/WO2023214310A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B29C48/03—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
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C48/255—Flow control means, e.g. valves
    • 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
    • B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
    • 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
    • B29C48/912—Cooling of hollow articles of tubular films
    • 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
    • B29C48/92—Measuring, controlling or regulating

Definitions

  • the present invention relates generally to the field of apparatuses for producing plastic blown films, i.e., extruded plastic films in bubble form. More particularly, the present invention relates to a cooling ring for an apparatus for the production of plastic blown films, wherein the cooling ring is provided with a system, which may be static, translating and/or rotating about its own axis, to make the flow of the cooling air leaving the ring more uniform.
  • a conventional apparatus for the production of plastic blown film basically comprises an extrusion head 1 from which a tubular film FT exits, a cooling ring 2 placed at the outlet of the extrusion head 1 for blowing cooling air onto the tubular film FT, a calibration cage 3 for guiding the tubular film FT, a thickness measuring device 4 for measuring the thickness of the tubular film FT, a take-up unit 5 for flattening the tubular film FT to form a flattened film FA and finally a winding unit 6 where the flattened film FA is trimmed and possibly divided into several parts before being wound onto reels B.
  • Figure 1 illustrates an apparatus in which the plastic material is extruded vertically, in a bottom-up direction.
  • Other apparatus configurations are known, however, in which cooling rings can be used, e.g. extrusion lines with a still vertical direction, but with top-down direction, and horizontal extrusion lines.
  • FIG. 2 A known example of a cooling ring 2 is shown in detail in Figures 2 and 3.
  • the cooling ring 2 comprises a hollow body 7 of annular shape extending around a circular central bore 8 through which the tubular film FT exiting the extrusion head 1 flows.
  • the hollow body 7 has at least one inlet opening 9 for allowing the entry of air, which entry in this case is directed in a tangential direction.
  • the hollow body 7 defines within it a path, generally of spiral shape in the case of a single inlet, along which the air, that is blown into the hollow body through the inlet opening 9, flows.
  • the hollow body 7 comprises an inclined inner wall 10, which acts as a deflector element to help divert the direction of the airflow from horizontal to vertical.
  • the air then passes through a plurality of windows 11 each defined by a pair of separating walls 12, oriented for example vertically and radially, to finally exit the cooling ring 2 through a plurality of outlet openings (not shown) directed radially or, more generally, towards the axis of the central bore 8 or, alternatively, through a single circular outlet opening.
  • windows and separating walls may however, depending on the design of the cooling ring, have different shapes and configurations than those shown in Figures 2 and 3.
  • a possible alternative configuration of windows and separating walls is known, for example, from CA1115471.
  • Appropriate fluidic and/or thermal adjusting means are normally provided to adjust the airflow leaving the cooling ring 2 through the aforementioned outlet openings.
  • flow adjusting members 13 that are translatable radially inwards or outwards, under control of suitable actuators, may be provided as adjusting means to decrease or increase, respectively, the cross-sectional area of the windows 11. Further solutions are known for example from US2021/291426 and W090/15707.
  • FIG. 4 shows the distribution of air flow velocities in two of the windows 11 of the cooling ring 2, obtained by computer simulation.
  • the distribution of the air flow velocities measured immediately upstream of each window 11 is highly inhomogeneous and, more importantly, there may be areas where the air flow velocity is even negative, i.e. where the air is sucked backwards instead of flowing towards the outlet openings.
  • a cooling ring comprising a hollow body, extending around a central bore, and at least one supply channel connected to the hollow body to supply a flow of cooling air, wherein, in order to obtain a uniform airflow exiting the hollow body there is provided, in each supply channel, a turbulator device having a plurality of flow-perturbating elements configured to interact with the airflow so as to cause at least part of the airflow to rotate around a flow axis before the airflow enters the hollow body.
  • flow-perturbating elements are arranged and configured to make the airflow turbulent at the periphery of the supply channel.
  • the present invention also relates to an apparatus for the production of plastic blown films comprising a cooling ring as specified above.
  • the present invention is based on the idea of positioning within the hollow body of the cooling ring a turbulator device having a plurality of flow-perturbating elements which are arranged in a distributed manner along at least one circumferential ring around the central bore of the hollow body and are configured to make the airflow with which said elements interact turbulent.
  • the proposed solution avoids, in the case of a cooling ring with several inlet channels, having to position the elements of the turbulator device in each inlet channel, as is necessary in the prior art discussed above.
  • FIG. 1 is a perspective view of a known example of an apparatus for the production of plastic blown film to which a cooling ring according to the present invention is applicable;
  • FIG. 2 is a perspective view of a known example of a cooling ring
  • FIG. 3 is an axial sectional view of part of the cooling ring of Figure 2;
  • FIG. 4 is a graph showing the distribution of air flow velocities immediately upstream of two adjacent windows of the cooling ring of Figure 2;
  • FIG. 5 is a graph showing the distribution of the average air flow velocities immediately upstream of the windows of the cooling ring of Figure 2, as well as of a cooling ring according to the present invention
  • FIG. 6 is a perspective view showing part of a cooling ring according to an embodiment of the present invention, sectioned through an axial section plane;
  • FIG. 7 is an axial sectional view of the turbulator device of the cooling ring of Figure 6;
  • FIG. 8 is a perspective view of the turbulator device of the cooling ring of Figure 6;
  • FIG. 9 is a graph similar to that of Figure 4, but relating to the cooling ring of Figure 6;
  • FIG. 10 is a perspective view of a further example of a turbulator device for a cooling ring according to the present invention.
  • FIGS 11 and 12 are a perspective view from above and a perspective view from below, respectively, showing in detail part of the turbulator device of Figure 10;
  • FIG. 13 and 14 are perspective views showing two further examples of a turbulator device for a cooling ring according to the present invention.
  • a cooling ring 2 comprises, in addition to the components already described above with reference to Figure 3, a turbulator device 14 positioned inside the hollow body 7, immediately upstream of the windows 11, so as to intercept the airflow which flows from the inlet opening (not visible in Figure 6) towards the outlet openings (also not visible in Figure 6) passing through the windows 11.
  • the turbulator device 14 is configured to interact with the air flowing from the inlet opening towards the outlet openings to generate turbulence and thus make the velocity distribution in the airflow upstream of the outlet openings more uniform.
  • the turbulator device 14 basically comprises a support structure 15 of annular shape and a plurality of flow-perturbating elements 16 protruding from the support structure 15 to interact with the airflow to make it turbulent.
  • the support structure 15 although in the drawings it is illustrated as a circular structure, it may also have a different shape, for example a polygonal one.
  • the expression "annular shape” above is therefore not to be understood as being limited to a circular shape.
  • the support structure 15 is formed of a single piece of annular shape, it might alternatively be formed of several separate pieces, angularly spaced apart from each other, along an annular path.
  • the flow-perturbating elements 16 extend radially inwards or, more generally, towards the axis of the central bore of the hollow body, thus not necessarily in a radial direction.
  • the flow-perturbating elements 16 are arranged along the entire inner perimeter of the support structure 15, preferably equally spaced from each other. More generally, the flow-perturbating elements 16 are arranged in a distributed manner along a circumferential ring around the central bore of the hollow body.
  • the number of flow-perturbating elements 16 can be appropriately chosen depending on the specific application.
  • the number of flow- perturbating elements 16 is twice the number of windows 11 , as shown in Figure 9.
  • the turbulator device 14 may be positioned so that, for each window 11 , there is a flow-perturbating element 16 arranged at the centreline of said window and that the two adjacent flow-perturbating elements 16 are each aligned with a respective separating wall 12 of said window, as shown in Figure 9.
  • the turbulator device 14 may be arranged rotated by a certain angle with respect to the position of Figure 9, for example so that none of the flow-perturbating elements 16 is aligned with one of the separating walls 12.
  • the flow-perturbating elements 16 have a transverse cross-section (i.e. , in the present case, a cross-section in a plane perpendicular to the radial direction) that is substantially isosceles trapezoid in profile, with a pair of bases extending horizontally and a pair of inclined sides joining the bases at their opposite ends and having the same length.
  • the shape of the transverse cross-section of the flow- perturbating elements 16 may, however, differ from that shown in Figures 8 and 9.
  • the flow-perturbating elements 16 may always have a trapezoidal shape, but with oblique sides of different lengths from each other, and therefore with an inclination with respect to the horizontal which differs from each other.
  • the function of the turbulator device 14 is, as mentioned above, to generate turbulence in the airflow flowing towards the outlet openings of the ring, not to channel the airflow along a certain direction.
  • the turbulator device 14 is arranged within the hollow body 7 so that the flow-perturbating elements 16 are at a certain distance from the walls of the hollow body 7 and the separating walls 12 of the windows 11 (if any).
  • the airflow flowing into the turbulator device 14 is not divided by it into individual airflows that are no longer communicating, but the various airflows flowing through the passages identified by each pair of adjacent flow-perturbating elements 16 have the possibility of interacting with each other downstream of the turbulator device 14 (but of course upstream of the outlet openings).
  • the flow-perturbating elements 16 are configured, as shown in Figure 7, in such a way that, considering the cross-section of said elements in a section plane extending longitudinally with respect to the airflow flowing through the turbulator device 14 (i.e., in the present case, a plane passing through the axis of the central bore of the cooling ring) the longitudinal dimension L of each element (i.e., the dimension of the element along the main direction of the airflow, which in the present case is the vertical direction or, more generally, the direction parallel to the axis of the central bore of the cooling ring) and the transverse dimension H of each element (i.e., the dimension of the element in a direction perpendicular to the main direction of the airflow) are linked by the following relation: L ⁇ 1.5 H.
  • the longitudinal dimension L is smaller than the transverse dimension H, i.e. L ⁇ H.
  • the turbulator device 14 further comprises a plurality of flow-deviating elements 17, which in the present case extend upwards from an upper annular edge of the support structure 15, preferably equally spaced from each other. More generally, the flow-deviating elements 17 are arranged distributed along a circumferential ring around the central bore of the hollow body 7. In the proposed embodiment, the flow-deviating elements 17 are all inclined by the same angle with respect to the radial direction, but might also be directed radially. Furthermore, in the proposed embodiment the number of flow-deviating elements 17 is equal to the number of flow-perturbating elements 16, but the two types of elements might also be different in number from each other.
  • the solution illustrated herein has windows 11 in a substantially perpendicular plane with respect to the axis of the hollow body 7 (i.e. the axis of the central bore of the hollow body), which in the typical case of a system in which the plastic material is extruded in a vertical direction is a horizontal plane, with the windows 11 being separated by substantially radial separating walls 12.
  • the flow-passage surfaces of the windows 11 might be arranged according to a different geometry, for example arranged on conical or cylindrical surfaces (the latter configuration corresponding to the case in which the windows open on radial channels).
  • the general configuration of the hollow body 7 may be different from the one proposed herein.
  • a plurality of inlet openings may be provided and/or the inlet opening(s) may lie in a different plane than a plane parallel to the axis of the central bore of the hollow body.
  • the outlet opening(s) may be directed not radially, but in any other direction oriented towards the axis of the central bore of the hollow body.
  • a single outlet opening may be provided, which extends over 360° around the central bore of the hollow body.
  • Figure 9 shows the distribution of flow velocities in two adjacent windows, which distribution is evidently more uniform than that in Figure 4 (prior art).
  • Figure 4 shows in a continuous line the course of the average velocities in the various windows of the cooling ring of Figure 6, which course, compared to that depicted in a dotted line and relating to a cooling ring according to the prior art, evidently shows greater uniformity, i.e., fewer deviations from one window to the other.
  • Figures 10 to 12 illustrate another possible embodiment of the turbulator device 14, which differs from that of Figures 6 to 8 substantially only in that it does not comprise the flow-deviating elements 17. What has already been set out above with reference to Figures 6 to 8 applies in all other respects.
  • Figure 13 illustrates a further embodiment of the turbulator device 14, which differs from that of Figures 6 to 8 substantially only in that it comprises a further group of flow- perturbating elements, indicated with 18, which are arranged in a horizontal plane placed at a higher elevation than that at which the plane of the flow-perturbating elements 16 is placed.
  • the flow-perturbating elements 18 preferably have a geometry similar to that of the flow-perturbating elements 16.
  • the flow-perturbating elements 18 are preferably arranged equally spaced from each other and/or alternating circumferentially with respect to the flow-perturbating elements16.
  • one or more further groups of flow-perturbating elements might be provided.
  • FIG 14 shows a further example of a turbulator device 14, in which the support structure 15 is formed by a simple flat ring and in which only one group of flow- perturbating elements 16 of a different shape than the flow-perturbating elements of the turbulator devices described above is provided.
  • each flow-perturbating element 16 comprises a central flat portion 16a, extending radially inwards from the support structure 15, substantially coplanar with the latter, and a pair of lateral flat portions 16b, extending inclined by a certain angle downwards from opposite edges of the central portion 16a.
  • the cooling ring may not have separating walls within the hollow body, which two by two define windows for the airflow, in which case the turbulator device would preferably be arranged immediately upstream of the outlet opening(s).
  • the turbulator device would preferably be arranged upstream of the first set of windows or, alternatively, between the first and second sets of windows.

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

Abstract

L'invention concerne un anneau de refroidissement (2) pour un appareil de production de film soufflé en plastique, qui comprend un corps creux (7) s'étendant autour d'un alésage central et ayant au moins une ouverture d'entrée pour un écoulement d'air de refroidissement et au moins une ouverture de sortie faisant face audit alésage central, de telle sorte que l'écoulement d'air entrant dans le corps creux (7) à travers ladite au moins une ouverture d'entrée quitte le corps creux (7) à travers ladite au moins une ouverture de sortie pour être soufflé sur un film tubulaire (FT) qui, après avoir quitté une tête d'extrusion (1) de l'appareil, est déplacé vers l'avant à travers ledit alésage central. L'anneau de refroidissement (2) comprend en outre un dispositif de turbulateur (14) qui est positionné à l'intérieur du corps creux (7) et est conçu pour générer une turbulence dans l'air s'écoulant à travers le corps creux (7). Le dispositif de turbulateur (14) comprend une pluralité d'éléments perturbateurs d'écoulement (16, 18) qui sont agencés de manière répartie le long d'au moins un anneau circonférentiel autour de l'alésage central du corps creux (7) de façon à rendre uniforme le flux d'air quittant le corps creux (7) à travers ladite au moins une ouverture de sortie.
PCT/IB2023/054565 2022-05-03 2023-05-02 Anneau de refroidissement pour appareil de production de films soufflés en plastique Ceased WO2023214310A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23728429.4A EP4519060A1 (fr) 2022-05-03 2023-05-02 Anneau de refroidissement pour appareil de production de films soufflés en plastique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102022000008921A IT202200008921A1 (it) 2022-05-03 2022-05-03 Anello di raffreddamento per un impianto per la produzione di film plastici soffiati
IT102022000008921 2022-05-03

Publications (1)

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WO2023214310A1 true WO2023214310A1 (fr) 2023-11-09

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PCT/IB2023/054565 Ceased WO2023214310A1 (fr) 2022-05-03 2023-05-02 Anneau de refroidissement pour appareil de production de films soufflés en plastique

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EP (1) EP4519060A1 (fr)
IT (1) IT202200008921A1 (fr)
WO (1) WO2023214310A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1115471A (fr) * 1979-01-15 1982-01-05 Charles M. Schott, Jr. Bague de refroidissement sur machine a faconner la pellicule plastique par soufflage
EP0062909A2 (fr) * 1981-04-13 1982-10-20 Gloucester Engineering Co., Inc. Anneau d'air ayant une rangée circulaire d'une grande multiplicité de passages substantiellement parallèles cellulaires dans le chemin d'écoulement d'air en direction de sortie
WO1990015707A1 (fr) * 1989-06-21 1990-12-27 Stefan Konermann Procede et dispositif pour la fabrication de feuilles soufflees
WO2016189518A2 (fr) * 2015-05-27 2016-12-01 I.M.Plast S.R.L. Appareil d'extrusion de film soufflé et procédé de fabrication d'un film soufflé
US20210291426A1 (en) * 2020-03-17 2021-09-23 Bucko Michael P External cooling air ring for blown- film extrusion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2847400T3 (es) 2018-05-22 2021-08-03 Kdesign Gmbh Dispositivo de refrigeración con un anillo de gas de refrigeración y un dispositivo de control de flujo

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1115471A (fr) * 1979-01-15 1982-01-05 Charles M. Schott, Jr. Bague de refroidissement sur machine a faconner la pellicule plastique par soufflage
EP0062909A2 (fr) * 1981-04-13 1982-10-20 Gloucester Engineering Co., Inc. Anneau d'air ayant une rangée circulaire d'une grande multiplicité de passages substantiellement parallèles cellulaires dans le chemin d'écoulement d'air en direction de sortie
WO1990015707A1 (fr) * 1989-06-21 1990-12-27 Stefan Konermann Procede et dispositif pour la fabrication de feuilles soufflees
WO2016189518A2 (fr) * 2015-05-27 2016-12-01 I.M.Plast S.R.L. Appareil d'extrusion de film soufflé et procédé de fabrication d'un film soufflé
US20210291426A1 (en) * 2020-03-17 2021-09-23 Bucko Michael P External cooling air ring for blown- film extrusion

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Publication number Publication date
EP4519060A1 (fr) 2025-03-12
IT202200008921A1 (it) 2023-11-03

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