WO2017175249A1 - Tête d'extrusion pour fabriquer des articles tubulaires - Google Patents

Tête d'extrusion pour fabriquer des articles tubulaires Download PDF

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Publication number
WO2017175249A1
WO2017175249A1 PCT/IT2016/000085 IT2016000085W WO2017175249A1 WO 2017175249 A1 WO2017175249 A1 WO 2017175249A1 IT 2016000085 W IT2016000085 W IT 2016000085W WO 2017175249 A1 WO2017175249 A1 WO 2017175249A1
Authority
WO
WIPO (PCT)
Prior art keywords
extrusion
abutment
head
abutment element
male element
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/IT2016/000085
Other languages
English (en)
Inventor
Giorgio Maccagnan
Simone Maccagnan
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.)
Gimac di Maccagnan Giorgio
Original Assignee
Gimac di Maccagnan Giorgio
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 Gimac di Maccagnan Giorgio filed Critical Gimac di Maccagnan Giorgio
Priority to PCT/IT2016/000085 priority Critical patent/WO2017175249A1/fr
Publication of WO2017175249A1 publication Critical patent/WO2017175249A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/25—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
    • B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • B29C48/327—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections with centering means
    • 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
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles

Definitions

  • the present invention relates to an extrusion head for making tubular articles such as hollow-section extruded articles or surface coverages of cables or cables already provided with a sheath.
  • the extrusion of certain three-dimensional geometric structures requires appropriate dimensional control systems, especially if the products to be achieved with this technique are of a particularly reduced size: for example, when the aim is to make tubular extruded articles (or even multi-layered articles such as cables covered by sheaths), it is of paramount importance to maintain a correct "straight" alignment during extrusion in order to avoid distortions of the extruded article or to avoid non-uniformity of the thicknesses along the axis of the article.
  • the state of the art provides, in this technical field, the presence of particular extrusion heads based on a central "pin-like" element that advances or retreats with respect to an abutment: the thickness of the extruded layer is determined depending on the airspace between the pinlike element (which in time may have a coaxial cable channel for the passage of a flow of air or of sacrificial material... or even a cable to be covered during extrusion) and the abutment.
  • the machines of known type are therefore not free from drawbacks, and therefore the object of this invention is to provide an extrusion head for tubular articles that substantially bypasses the drawbacks presented above.
  • the object of the present invention is therefore to make available an extrusion head which provides much higher performance (compared to those of extrusion heads of the known type) in terms of accuracy of the obtained manufactured article, minimization of the risk of damaging any semifinished articles entering the extrusion head and undergoing multi-layering or covering processes, or whatever, and in terms of adjustment/calibration possibility.
  • an object of the present invention is to devise an extrusion head which can be significantly more compact in terms of size, thus being easier to control in terms of thermal gradients and minimizing the dependency and/or the onset of transient flow phenomena (with the related control complications) in the molten material which is made to flow in the head itself.
  • FIG. 1 shows a sectional view of the extrusion head in accordance with the invention.
  • FIG. 2 is a partially exploded perspective view of the head of figure 1.
  • the extrusion head according to the invention is referred to with the reference 1 in the accompanying drawings and consists of an abutment element 2, which has at least one outlet opening oriented along an extrusion axis "A", which in turn is adapted to define at least an outer diameter of a tubular extruded article, and a male element 3 operatively associated with the abutment element 2 at least at the aforementioned outlet opening and which is adapted to define, in cooperation with the abutment element 2, a passage section for an extrusion material.
  • outlet opening may be considered as meaning the two- dimensional space in correspondence of the last material surface of the head 1 met by an extruded material through it (material that travels through the head along the extrusion axis A), while the expression “passage section” may mean all three-dimensional conformation space existing between the structural elements 2 and 3 and occupied by the extrusion material flow: from a topological point of view, the outlet opening is thus configured as an ideal surface that belongs to the ideal three- dimensional shape associated with the "empty space” consisting of the passage section.
  • the head 1 comprises adjustment means 4 of the position and/or relative orientation between the male element 3 and the abutment element 2 to vary the relative juxtaposition conditions at least with respect to said extrusion axis A (and therefore to control both the resulting weight of the extrusion and the direction of the extruded or co-extruded article, particularly so with reference to the extrusion axis A).
  • these adjustment means 4 comprise mating surfaces with complementary concavity and respectively associated to the abutment element 2 and the male element 3: thanks to this particular geometry (and to the consequent mutual coupling kinematic relationship), these mating surfaces with complementary concavity can be placed in a position of mutual proximity and/or contact in correspondence with the operating conditions of the head 1 and may then determine a very accurate and fast relative orientation condition in an extremely compact space.
  • the mating surfaces with complementary concavity are respectively shaped according to a sphere and in turn comprise:
  • these mating surfaces with complementary concavity also define, in cooperation with the abutment element 2 and the male element 3, a part of the passage section for the material in extrusion, thus exerting two technical effects simultaneously: with reference to the ability to slide the material in extrusion it should be noted, however, that flow channels 4c may be present, suitably derived (for example by removal of material) in the first complementary surface 4a and/or in the second complementary surface 4b, so as to be in fluid communication with the outlet opening in the operating conditions of the head 1.
  • the adjustment means 4 also comprise a predetermined number of adjustment bodies 5 simultaneously interconnected to the abutment element 2 and to the male element 3 to determine locally differentiated and/or selective relative distance configurations (or in other words, to be able to determine with sufficient precision and measurability the relative rotations between the two "main" structural elements 2 and 3 of the head 1): in the illustrated exemplary embodiment, these adjustment bodies 5 comprise a predetermined number of threaded rods meshed through the abutment element 2 and connected at a first end with the male element 3.
  • the threaded rods are arranged in a radially equispaced configuration around the extrusion axis A and, in order to be able to be operated by a common tool such as a wrench or similar, they are typically equipped with interface heads at a second end opposite to the first end just cited above.
  • abutment element 2 is in turn composed of these sub-elements:
  • first base half-part 2a comprising a predetermined number of inflow ducts of the material in extrusion (these inflow ducts are in fluid communication with the flow channels 4c and the outlet opening) and further comprising the first complementary surface 4a;
  • the abutment element 2 (and, for example, the first base half-part 2a) comprises heating means 8 adapted to transfer a given heat flux to the head 1 : these heating means 8 can more in general be of various nature (electrical inductors or means of irradiation by pointing a laser beam, as explained in another patent of the same applicant of this invention) and can be activated on a structural part of the head 1 , provided that they are adapted to determine the correct temperature profile in the vicinity of the passage section of the material in extrusion.
  • first operating portion 3a of prismatic conformation and preferably cylindrical, adapted to penetrate the abutment element 2 and to define, in cooperation with it, a part of the passage section for the material in extrusion;
  • this second shrink-fit portion 3b in fact includes the second complementary surface 4b;
  • the male element 3 also comprises an axial adjustment portion 6 adapted to vary, preferably by means of relative sliding, a relative position of the first operating portion 3a with respect to the abutment element 2: that axial adjustment portion 6 typically comprises an adjustment threaded ring meshed in a manner proportional to the third connection portion 3c (or more generally, kinematic arrangements with equivalent technical effect).
  • an axial insertion cavity 7 which is substantially coaxial with the entire male element 3 and extends along the extrusion axis A until the outlet opening: this axial cavity 7 serves to slide in the head a body or a semi-finished product to be co- extruded, which is coupled geometrically in correspondence with the material in extrusion at the outlet opening.
  • the invention allows to obtain several advantages over the known art.
  • the present extrusion device (or "head") is therefore highly versatile in the operating field on tubular articles or in the multi-layered processing of products involving the insertion in the head of a core to be coated: this versatility is therefore reflected in terms of better and longer operating life, reduced maintenance and higher reliability...in addition to an easier and more accurate adjustment in terms of alignment and targeting of the outlet section of the extruded material with respect to the orientation/shrink-fitting axis of the part inside the extrusion head itself.

Landscapes

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

Abstract

La présente invention concerne une tête d'extrusion pour fabriquer des articles tubulaires qui comprend un élément de butée (2) et un élément mâle (3) associé à l'élément de butée (2), en correspondance avec une ouverture de sortie afin de définir une section de passage d'un matériau d'extrusion ; la tête d'extrusion comprend en outre un moyen pour régler (4) la position et/ou l'orientation relative entre l'élément mâle (3) et l'élément de butée (2) afin de faire varier les conditions de juxtaposition relatives au moins par rapport à un axe d'extrusion (A) ; le moyen de réglage (4) comprend des surfaces d'accouplement avec une concavité complémentaire et respectivement associées à l'élément de butée et à l'élément mâle : ces surfaces d'accouplement avec une concavité complémentaire sont en condition de proximité mutuelle et/ou en contact.
PCT/IT2016/000085 2016-04-06 2016-04-06 Tête d'extrusion pour fabriquer des articles tubulaires Ceased WO2017175249A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000085 WO2017175249A1 (fr) 2016-04-06 2016-04-06 Tête d'extrusion pour fabriquer des articles tubulaires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000085 WO2017175249A1 (fr) 2016-04-06 2016-04-06 Tête d'extrusion pour fabriquer des articles tubulaires

Publications (1)

Publication Number Publication Date
WO2017175249A1 true WO2017175249A1 (fr) 2017-10-12

Family

ID=56098313

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2016/000085 Ceased WO2017175249A1 (fr) 2016-04-06 2016-04-06 Tête d'extrusion pour fabriquer des articles tubulaires

Country Status (1)

Country Link
WO (1) WO2017175249A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856448A (en) * 1971-12-29 1974-12-24 Toyo Soda Mfg Co Ltd Multi-core circular die for preparing multi-layer tubular film
US4111630A (en) * 1975-06-13 1978-09-05 Toyo Soda Manufacturing Co., Ltd. Multi-core rotary circular die
SU880779A2 (ru) * 1979-01-24 1981-11-15 Экспериментально-Конструкторский И Технологический Институт Минавтопрома Ссср Экструзионна головка дл изготовлени рукавной полимерной пленки
SU897550A2 (ru) * 1979-10-05 1982-01-15 Экспериментально-Конструкторский И Технологический Институт Минавтопрома Ссср Экструзионна головка дл изготовлени рукавной полимерной пленки
JPH0366722U (fr) * 1989-10-31 1991-06-28
US6514341B1 (en) * 2000-04-03 2003-02-04 Avaya Technology Corp. Method and apparatus for removing optical fiber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856448A (en) * 1971-12-29 1974-12-24 Toyo Soda Mfg Co Ltd Multi-core circular die for preparing multi-layer tubular film
US4111630A (en) * 1975-06-13 1978-09-05 Toyo Soda Manufacturing Co., Ltd. Multi-core rotary circular die
SU880779A2 (ru) * 1979-01-24 1981-11-15 Экспериментально-Конструкторский И Технологический Институт Минавтопрома Ссср Экструзионна головка дл изготовлени рукавной полимерной пленки
SU897550A2 (ru) * 1979-10-05 1982-01-15 Экспериментально-Конструкторский И Технологический Институт Минавтопрома Ссср Экструзионна головка дл изготовлени рукавной полимерной пленки
JPH0366722U (fr) * 1989-10-31 1991-06-28
US6514341B1 (en) * 2000-04-03 2003-02-04 Avaya Technology Corp. Method and apparatus for removing optical fiber

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