EP3888811A1 - Apparatus for manufacturing pre-colored metal conduits and related conduit - Google Patents

Apparatus for manufacturing pre-colored metal conduits and related conduit Download PDF

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Publication number
EP3888811A1
EP3888811A1 EP21020146.3A EP21020146A EP3888811A1 EP 3888811 A1 EP3888811 A1 EP 3888811A1 EP 21020146 A EP21020146 A EP 21020146A EP 3888811 A1 EP3888811 A1 EP 3888811A1
Authority
EP
European Patent Office
Prior art keywords
strip
conduit
seaming
diameter
cylindrical portion
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.)
Pending
Application number
EP21020146.3A
Other languages
German (de)
English (en)
French (fr)
Inventor
Gino Guasti
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.)
Zeffiro Srl
Original Assignee
Zeffiro 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 Zeffiro Srl filed Critical Zeffiro Srl
Publication of EP3888811A1 publication Critical patent/EP3888811A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/123—Making tubes or metal hoses with helically arranged seams of coated strip material; Making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/12—Making tubes or metal hoses with helically arranged seams
    • B21C37/126—Supply, or operations combined with supply, of strip material

Definitions

  • the present invention relates to the sector of air conduits.
  • it concerns the sector of air conduits for commercial or residential construction.
  • conduits thus made are normally made of galvanized steel and can be spray painted on their outer side. This type of painting process is extremely expensive since the conduits are normally of a certain length and are difficult to maneuver and transport. Furthermore, given their size, these tubes can only be painted in painting booths having suitable dimensions. Finally, after painting, these conduits must also be protected so as not to damage the painting during transport.
  • the undersigned company has tried to obtain spiral conduits from painted metal strips using traditional unmodified machines, but the coating breaks. In particular, where the sheet of the strip is bent to make the seam, the paint breaks, revealing the underlying metal. Sometimes, these seaming can also trigger exfoliation of the paint layer.
  • a first driving roller which comes into contact with the surface finishing layer, comprises a surface coating made of polymeric material, preferably elastomeric, even more preferably polyurethane. Said conformation of the first seaming roller allows seaming the opposite longitudinal edges of the painted metal strip or covered with a film, without creating tension on the paint or film such as to tear or damage it. Said driving roller allows to push the strip without damaging it before seaming it.
  • Said tapered sides can be truncated-conical surfaces extending from said second cylindrical portion to said first and second cylindrical portions respectively.
  • the surfaces thus shaped allow to guide the seaming of the opposing longitudinal edges of the painted metal strip or covered with a film, facilitating the seaming.
  • the angles of inclination of truncated-conical surfaces with respect to the axis of revolution of the first seaming roller can be comprised between 30° and 60°, preferably of about 45°, because, with these values, the paint or film does not break by seaming the opposite edges of the strip.
  • said seaming rollers comprise a second seaming roller opposed to said first seaming roller adapted to cooperate for realizing said seaming.
  • Said second seaming roller has a rotation axis parallel to the rotation axis of the first seaming roller.
  • Said second seaming roller comprises a cylindrical portion having a width greater than the sum of the widths of said second cylindrical portion and of said tapered sides of the first seaming roller. This technical feature prevents the edges to be seamed from coming out of the seaming rollers.
  • said driving rollers can be opposed to each other with parallel axes and are pushed towards each other, to improve the grip on the strip, by means of a pushing mechanism configured to regulate the distance between said parallel axes.
  • the thrust of the driving rollers can be adjusted to avoid detachment of the surface finishing layer from the metal strip during its push towards the seaming rollers.
  • said second driving roller which comes into contact with the side of the strip without the finishing surface layer and used for forming the inner side of the conduit, can comprise a surface coating made of a metal having a hardness lower than 3.5 in Mohs scale or of a polymeric material, preferably elastomeric, even more preferably polyurethane.
  • a surface coating made of a metal having a hardness lower than 3.5 in Mohs scale or of a polymeric material, preferably elastomeric, even more preferably polyurethane.
  • said second driving roller can comprise a knurled surface to allow a better grip on the strip. This surface finishing of the second roll further improves the grip on the strip.
  • said driving rollers can be arranged upstream of the seaming rollers with respect to the direction of forward motion of the strip.
  • said driving rollers push the strip towards the seaming rollers.
  • said shaping rollers are arranged upstream of the seaming rollers and of the driving rollers with respect to the direction of forward motion of the strip.
  • said apparatus can comprise a device for perforating the strip to form holes on the conduit for the air supply and return.
  • the conduit realized by the apparatus in addition to being perfectly finished by the surface finishing layer, is ready for installation because it already includes the ventilation holes.
  • a second object of the present invention is to provide an air conduit comprising a metal strip, comprising a surface finishing layer, spirally wound and seamed, comprising one or more graphic elements arranged aligned with each other along the conduit, each of which is inclined with respect to one of the longitudinal edges of the strip by an angle that is a function of the width of the strip and of the diameter of the conduit.
  • said angle is equal to arccos [(B-3B') / ⁇ D], where B is the width of the strip, B' is the width of the seam and D is the diameter of the conduit.
  • said conduits can comprise a plurality of holes for supplying and returning the air. These conduits allow a pleasant aesthetic impact and at the same time an effective ventilation of the rooms.
  • said air conduits can comprise a chemical surface treatment arranged in direct contact with the metal of the strip. This layer allows to avoid an oxidation of the metal strip.
  • the strip can comprise a primer and an overlying layer of colored paint that entirely cover the side of the strip that faces outside of the conduit.
  • the strip can comprise a printed layer reproducing said graphic elements and arranged over the colored paint layer. In this way, the conduit appears finished as if it had been painted with an ornamental pattern at a later stage after its shaping. This allows a considerable saving of time and money during the production of the conduit.
  • said strip can comprise an adhesive-type film, reproducing said graphic elements, which entirely covers one side of the strip. This solution allows to obtain a conduit in less time.
  • said graphic elements can comprise letters of a writing to personalize the air conduit with a trademark or a slogan.
  • a third object of the present invention is a manufacturing method of a painted or decorated conduit comprising the steps of:
  • the method thus defined allows to obtain a painted or decorated conduit at low cost and without post-processing steps on the conduit.
  • the method can comprise the preliminary phase of reproducing a decoration comprising one or more graphic elements on the film so that each graphic element is inclined with respect to one of the longitudinal edges of the strip by an angle which is a function of the width of the strip and the diameter of the conduit.
  • said angle being equal to arccos[(B-3B')/ ⁇ D], where B is the width of the strip, B' is the width of the seam and D is the diameter of the conduit.
  • conduit refers to the single pipe element, having a generally circular section, and an extension varying from a minimum of a few centimeters to a maximum of tens of meters.
  • pipeline means the group of conduits connected to each other to allow the transportation of air from one point to another.
  • an apparatus 1 for manufacturing a spiral seamed conduit 10 is shown.
  • the apparatus 1 object of the present invention is substantially known apart from some technical modifications required to solve the technical problem of seaming a painted or film-coated strip without damaging or ruining the surface finishing layer 12, in particular in correspondence with the seaming 8.
  • the main elements of an apparatus 1 for manufacturing the spiral seamed conduit are therefore described below, since the other not described technical elements can be easily found in the state of the art by an expert in the field of machinery of this type.
  • An apparatus 1 for manufacturing a spiral seamed conduit 10 of the classic type comprises a coil 15 of a strip arranged upstream of a series of shaping rollers 3 arranged near the entrance of the strip 2 into the apparatus 1.
  • Said shaping rollers 3 can be of the type shown in Fig. 2 , thus opposed two by two, or of the type with vertical axis of revolution (not shown), according to what is already known in the state of the art.
  • the strip 2 then comes into contact with one or more driving rollers 5 which pull the strip 2 through the shaping rollers 3 and push it towards the seaming rollers 7.
  • the driving rollers 5 according to the present invention are modified compared to the state of the art to allow a better adhesion to the strip 2, since it has a surface finishing layer 12. Since the surface finishing layer 12 considerably reduces the grip of the driving rollers 5 on the strip 2, the driving rollers 5 are superficially covered with a coating of polymeric material, preferably elastomeric, even more preferably polyurethane. In particular, the polyurethane coating, due to its hardness and its elasticity, allows a better grip on the strip 2 and therefore a better dragging of the strip 2 painted or covered by the surface finishing layer 12.
  • the driving rollers 5 are motorized and push the strip 2 towards the seaming rollers 7.
  • the driving rollers 5 are opposite each other with parallel axes and are pushed towards each other by a pushing mechanism (not shown) to improve the grip on the strip 2.
  • Said pushing mechanism allows to change the distance of said parallel axes.
  • the apparatus can comprise a single pair of driving rollers 5 opposite each other, as shown in Fig. 2 , but can also comprise several pairs of driving rollers 5 arranged in series with each other (not shown).
  • the lower roller in Fig. 2 thus the one in contact with the side of the strip 2 used to form the outer surface of the conduit 10 and comprising the surface finishing layer 12, is called the first driving roller 5'; while the upper roller in Fig.
  • the strip 2 guided by the driving rollers 5 enters inside a forming head 6 with a cylindrical development of a known type.
  • This forming head 6 can be made of metal or cast iron and has a cylindrical or spiral shape.
  • the forming head 6 also has an inlet and an outlet of a known type.
  • the strip 2 enters, in a known manner, inside the forming head 6 and thanks to its spiral-shape bends the strip 2.
  • the forming head 6 is configured to carry the longitudinal edges 4, shaped by the shaping rollers 3, to engage with each other.
  • the apparatus 1 also comprises seaming rollers 7 configured to seam the edges engaged by the forming head 6. Said seaming 8 also has a longitudinal spiral development.
  • Said seaming rollers 7 comprise a first seaming roller 7' which has an improved profile.
  • the first seaming roller 7' comprises three cylindrical portions connected to each other: a first cylindrical portion 9a, a third cylindrical portion 9c and a second cylindrical portion 9b arranged between the first two.
  • the first cylindrical portion 9a has a first diameter d1
  • the third cylindrical portion 9c has a third diameter d3 which are both greater than the diameter d2 of the second cylindrical portion 9b.
  • the first cylindrical portion 9a is connected to the second cylindrical portion 9b by means of a first tapered side 11'
  • the third cylindrical portion 9c is connected to the second cylindrical portion 9b by means of a second tapered side 11".
  • the tapered sides 11', 11" are truncated-conical surfaces, as shown in Fig. 4 .
  • the truncated-conical surface connecting the first cylindrical portion 9a and the second cylindrical portion 9b is the lateral surface of a truncated-cone having a larger base with a diameter equal to d1 and a smaller base with a diameter equal to d2.
  • the truncated-conical surface connecting the third cylindrical portion 9c and the second cylindrical portion 9b is the lateral surface of a truncated-cone having a larger base with a diameter equal to d3 and a smaller base with a diameter equal to d2.
  • These tapered sides allow seaming rollers without sharp edges.
  • the sharp edges of the traditional seaming rollers generate more squared seaming, but, in the case of painted or film-covered strips, they break or damage the paint or film in correspondence the squared bending.
  • the tapered sides, in particular if truncated-conical, allow to obtain seaming 8 having softer and tapered profiles, so to avoid damages or breaks of the paint / film in correspondence with them.
  • Said first tapered side 11' having a truncated-conical surface defines a first angle of inclination ⁇ ' with the axis of revolution R1
  • said second tapered side 11" having a truncated-conical surface defines a second angle of inclination ⁇ " with the axis of revolution R1.
  • inclination angles ⁇ ', ⁇ " between 30 and 60 degrees, preferably of about 45 degrees, the strip 2 comprising the surface finishing layer 12 does not undergo surface stress such as to trigger cracks in the surface finishing layer 12 itself.
  • the first diameter d1 of the first cylindrical portion 9a is greater than the third diameter d3 of the third cylindrical portion 9c.
  • said third cylindrical portion 9c is arranged towards the side of the apparatus 1 from which the finished conduit 10 comes out. Since the diameter of the output side of the first seaming roller 7' is smaller, the exit of the seamed strip from the seaming rollers 7 is facilitated and the seaming 8 is less exposed to damage.
  • the first cylindrical portion 9a can comprise two contiguous cylindrical sub-portions, the sub-portion closest to the second cylindrical portion 9b has a reduced diameter with respect to d1 by a value between 0,1 and 0,2 mm, while the other sub-portion has a diameter equal to d1.
  • This small step of the first cylindrical portion 9a allows to reduce the pressure of the first seaming roller 7' on the strip 2 astride the second cylindrical portion 9b.
  • the seaming rollers 7 also comprise a second seaming roller 7" opposed to the first seaming roller 7' which cooperates with the first one to achieve said seaming 8 of the strip 2. These seaming rollers 7',7" have respectively rotation axes R1, R2 parallel to each other.
  • the second seaming roller 7" comprises a cylindrical surface 9d, which cooperates with the cylindrical surfaces 9a, 9b, 9c of the first roller 7' in order to bend and seam the edges 4 of the strip 2.
  • the width L2 of the cylindrical portion 9d is greater than the sum of the widths L3, L4, L5 of the second cylindrical portion 9b and of the tapered sides 11', 11".
  • the diameter d4 of the second seaming roller 7" is smaller than said first diameter d1 of the first cylindrical portion 9a.
  • the seaming rollers 7', 7" are aligned with each other when viewed from the front as shown in Fig. 4 .
  • All the rollers of the apparatus 1, or some of them, are kinematically connected to each other, so that the shaping rollers 3 and the seaming rollers 7 help to drive the strip 2. Furthermore, in this way, a single motor is enough to drive, by means of a chain of gears, all the rollers of the apparatus 1.
  • the control of the apparatus 1 takes place by means of a control unit 16 configured for the purpose.
  • the apparatus 1 may further comprise a device for perforating in line the strip 2, thus capable of perforating the strip 2 while it passes through the apparatus 1.
  • This perforation device (not shown) is configured to punch or cut with a laser the strip 2 and can make one or more holes 14 having the same or different shape and size.
  • the air conduit 10 comprises a surface finishing layer 12, wherein said strip 2 is spirally wound and seamed.
  • a further aspect of the present invention is represented by the possibility of reproducing graphic elements 13 aligned on the conduit 10 without the need for an artisanal painting of the already formed conduit.
  • the possibility of reproducing images or writings such as the one in Fig. 6 is completely unknown without post-painting process of the conduit.
  • a conduit suitable for solving this problem and the relative method are described below.
  • the conduit 10 of Fig. 6 can be obtained from a strip 2 equipped with a surface finishing layer 12.
  • This surface finishing layer 12 is decorated with graphic elements 13 in accordance with a geometric rule which is a function of the diameter D of the conduit 10 to be realized and the width B of the strip 2.
  • a geometric rule which is a function of the diameter D of the conduit 10 to be realized and the width B of the strip 2.
  • the graphic element 13 is a writing 13', to allow the writing 13' to be aligned and without interruptions or defects on the conduit 10, it needs be reproduced on strip 2 according to the following rule.
  • the writing 13' needs to be inclined with respect to one of the longitudinal edges 4 of the strip by an angle ⁇ .
  • This angle ⁇ is a function of the width B of the strip 2 and the diameter D of the conduit 10.
  • the angle ⁇ is also a function of the width B' of the seaming 8.
  • the term "substantially” indicates that the value of the angle ⁇ may need corrections of the order of a tenth or hundredth of a degree, due to possible misalignments caused by the thickness of the strip 2.
  • the writing 13' In order to be aligned on the conduit, the writing 13' needs also to be reproduced at a regular interval which is a function of the width B of the strip 2 and the diameter D of the conduit 10.
  • the distance between the graphic elements of the writing 13' is also a function of the width of the seaming 8.
  • the distance L between the graphic elements of the writing 13' is substantially calculated with the following formula: ( ⁇ D) 2 / [( ⁇ D) 2 -(B-3B') 2 ] (1/2) , where B is the width of the strip 2, B' is the width of the seaming and D is the diameter of the conduit 10.
  • the term "substantially" indicates that the distance value L may need adjustments of the order of a couple of millimeters due to possible misalignments caused by the thickness of the surface finishing layer 12.
  • Fig. 6 represents fictitious writings 13" (in black) aligned horizontally with each other (for example left-aligned as in Fig. 6 ).
  • Fig. 6 the fictitious writing 13" are overturned as they are reproduced on the lower side of the strip 2, so that by wounding the strip 2, the writing appears on the outer side of the conduit 10.
  • the fictitious writing 13" are also vertically spaced and follow reference lines 17.
  • the reference lines 17 have a distance S from each other that depends on the angle ⁇ and the length L.
  • the distance S between the reference lines 17 is equal to ⁇ D.
  • the fictitious writings 13" are horizontally aligned and parallel to each other, each at a distance ⁇ D from the next or previous.
  • the portion of the fictitious writings 13" that falls on the strip 2 (striped) is the portion of the graphic element 13 to be reproduced on the surface finishing layer 12.
  • a part of the strip 2 used for seaming 8 does not contribute to the external appearance of the conduit 10, since it is used to block the edges 4 of the strip 2 together, these portions of the strip 2 do not need to be decorated. Even if they were, the decoration would not be visible on the conduit 10.
  • This portion of strip 2 involved in the seaming, and not visible, is wide 2B' on one side and B' on the opposite side of the strip 2, where B' is the width of the seaming 8 measurable on the conduit 10 or obtainable from the width L3 of the second cylindrical portion 9b of the first seaming roller 7'.
  • B' is the width of the seaming 8 measurable on the conduit 10 or obtainable from the width L3 of the second cylindrical portion 9b of the first seaming roller 7'.
  • the outer edge 4 (towards the left of the image) is involved in the seaming 8 for a width equal to twice the width of the seaming itself, that is 2B'.
  • the inner edge 4 (towards the right of the image) is involved in the seaming 8 for a width equal to once the width of the seam itself, that is B'.
  • a conduit and a process of this type allow to reproduce on the surface finishing layer 12 a writing 13' or any other graphic element 13, for example a cloud or a logo, in order to be aligned on the conduit
  • the process for reproducing said writing 13' or graphic element 13 on a conduit 10 comprises a first step of decorating the strip 2 and a second step of realizing the conduit 10 with said decorated strip.
  • the step of decorating the strip 2 comprises the sub-steps of:
  • the predicted angle ⁇ is substantially equal to arccos [(B-3B')/ ⁇ D], where B is the width of the strip 2, B' is the width of the seam 8 and D is the diameter of the conduit 10.
  • the aforementioned distance L is substantially equal to ( ⁇ D) 2 /[( ⁇ D) 2 -(B-3B') 2 ] (1/2) .
  • Fig. 7 shows a writing 13' sectioned into sections 18 in accordance with what has been described above, wherein each section 18 has a parallelogram shape with a base equal to (B-3B')/sin( ⁇ ), and a height lower than conduit 10 diameter.
  • the step of manufacturing the conduit 10 comprises the sub-steps of:
  • said seaming step is carried out by means of seaming rollers as described above.
  • said wounding step is carried out by pulling a strip 2 with driving rollers 5 comprising a surface coating in polymeric material as described above.
  • the writing 13' is reproduced both on the strip 2 and on the outer side of the seaming 8 without discontinuity or misalignment, as if it had been painted on the finished conduit in a second moment, but without the complications of case.
  • the surface finishing layer 12 can be printed by means of a machine suitable for the purpose and attached to a traditional metal strip.
  • this strip 2 with the surface finishing layer 12 can be processed by an apparatus, according to the present invention, in order to realize a conduit 10 having a writing 13' visible on the outer side obtained by means of said surface finishing layer 12 joined to the strip 2. The same happens when one or more graphic elements 13 are reproduced, instead of a writing 13'.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP21020146.3A 2020-03-18 2021-03-14 Apparatus for manufacturing pre-colored metal conduits and related conduit Pending EP3888811A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102020000005728A IT202000005728A1 (it) 2020-03-18 2020-03-18 Macchinario per produrre tubi metallici pre‐colorati aggraffati a spirale, relativo condotto e relativo metodo

Publications (1)

Publication Number Publication Date
EP3888811A1 true EP3888811A1 (en) 2021-10-06

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EP21020146.3A Pending EP3888811A1 (en) 2020-03-18 2021-03-14 Apparatus for manufacturing pre-colored metal conduits and related conduit

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EP (1) EP3888811A1 (it)
IT (1) IT202000005728A1 (it)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279153A (fr) * 1960-02-15 1961-12-15 Procédé et machine pour la fabrication de tuyaux en feuillards enroulés en spirale
GB951570A (en) * 1961-09-20 1964-03-04 Driam S A Improvements in or relating to helical seam pipe mills
US3220234A (en) * 1961-12-06 1965-11-30 Harper Laffie Machine for forming helical lock seam pipe
US4481978A (en) * 1978-07-04 1984-11-13 Westaflex-Werk L.U.F. Westerbarkey Gmbh & Co. Method of manufacturing helically wound tubes and tubes manufactured by said method
GB2213748A (en) 1987-12-21 1989-08-23 Spiro Machines Sa Machine for producing spirally-seamed corrugated metal tubing
EP0885071A1 (en) 1995-06-30 1998-12-23 Lindab Aktiebolag Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication
IT201800005813A1 (it) * 2018-05-29 2019-11-29 Condotto di aerazione avvolto a spirale dotato di una pluralità di fori, relativo macchinario e relativo nastro

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1279153A (fr) * 1960-02-15 1961-12-15 Procédé et machine pour la fabrication de tuyaux en feuillards enroulés en spirale
GB951570A (en) * 1961-09-20 1964-03-04 Driam S A Improvements in or relating to helical seam pipe mills
US3220234A (en) * 1961-12-06 1965-11-30 Harper Laffie Machine for forming helical lock seam pipe
US4481978A (en) * 1978-07-04 1984-11-13 Westaflex-Werk L.U.F. Westerbarkey Gmbh & Co. Method of manufacturing helically wound tubes and tubes manufactured by said method
GB2213748A (en) 1987-12-21 1989-08-23 Spiro Machines Sa Machine for producing spirally-seamed corrugated metal tubing
EP0885071A1 (en) 1995-06-30 1998-12-23 Lindab Aktiebolag Method and apparatus for producing helically-wound lock-seam tubing with reduced lubrication
IT201800005813A1 (it) * 2018-05-29 2019-11-29 Condotto di aerazione avvolto a spirale dotato di una pluralità di fori, relativo macchinario e relativo nastro

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