WO2015132749A1 - Unité pour l'application d'une bande de caoutchouc extrudé sur une carcasse de pneumatique - Google Patents

Unité pour l'application d'une bande de caoutchouc extrudé sur une carcasse de pneumatique Download PDF

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Publication number
WO2015132749A1
WO2015132749A1 PCT/IB2015/051608 IB2015051608W WO2015132749A1 WO 2015132749 A1 WO2015132749 A1 WO 2015132749A1 IB 2015051608 W IB2015051608 W IB 2015051608W WO 2015132749 A1 WO2015132749 A1 WO 2015132749A1
Authority
WO
WIPO (PCT)
Prior art keywords
carcass
unit
extruded rubber
head
application
Prior art date
Application number
PCT/IB2015/051608
Other languages
English (en)
Inventor
Silvano TURELLA
Vitantonio Magistrale
Alessandro CUMER
Original Assignee
Marangoni S.P.A.
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 Marangoni S.P.A. filed Critical Marangoni S.P.A.
Publication of WO2015132749A1 publication Critical patent/WO2015132749A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/58—Applying bands of rubber treads, i.e. applying camel backs
    • B29D30/60—Applying bands of rubber treads, i.e. applying camel backs by winding narrow strips

Definitions

  • the present invention relates to a unit for application of an extruded rubber strip.
  • the subject invention is advantageously used for the distribution and application of extruded rubber in a viscous or plastic form on suitably prepared tire carcasses during the process of reconstruction of tires for motor vehicles in general, in particular industrial and/or commercial vehicles, such as for example trucks, buses, earth moving machines or similar, to which the following description makes explicit reference, without loss of generality.
  • the process of reconstruction of worn tires substantially consists in previously removing from the tire the worn tread through a rasping step, then distributing a layer (under-layer) of extruded rubber or compound in a viscous form on the tire carcass cleaned of the old tread, in order to define a covering surface, able to support a new tread and finally make the new tread.
  • the final execution of the new tread can be made in hot condition through a rotary machine which applies a further new layer or raw rubber to be molded and vulcanized, or in cold condition, through a further application on the cover of a pre-molded and already vulcanized tread.
  • a rotary machine which applies a further new layer or raw rubber to be molded and vulcanized, or in cold condition, through a further application on the cover of a pre-molded and already vulcanized tread.
  • an operating unit made of a rotary distributing group normally with a vertical axis and connected with an extruder device of the rubber, generally placed with an horizontal orientation together with further coating devices, by fixing the extruded rubber on the carcass itself and subsequently finally cutting the rubber layer.
  • a structure of operating unit so realized has numerous drawbacks, the main one being defined by the substantial impossibility of using power extruders with greater production capacity with respect to the present one, in particular during the operation of covering tire carcasses of great size for example such those used in earth moving machines.
  • the aim of the present invention is to eliminate the above highlighted drawbacks of the known technique.
  • an aim of the present invention is to realize a unit of application of extruded rubber, with a greater productive power and efficiency, by at the same time eliminating the need of using further devices.
  • a further aim of the present invention is to realize a unit for an efficient and powerful application of a rubber layer on a tire carcass to be reconstructed, both on the central peripheral surface of the carcass or tread, and on lateral surfaces or sides of the carcass itself.
  • figure 1 shows, in a schematic side view, a preferred embodiment of the application unit subject of the present invention, shown in one of its operating positions;
  • figure 2 is a plan view from above of the application unit in Figure 1 , in the same operating position;
  • figure 3 shows in a side schematic view the unit of Figure 1 in another operating position
  • figure 4 is a plan view from above of the application unit in Figure 3 in the same operating position;
  • figure 5 shows in a perspective view a component of the unit in Figures 1 and 2;
  • figure 6 is a plan view from above of the component in Figure 5.
  • U globally indicates a unit of application of an extruded rubber layer or film on a carcass C of a tire P to be reconstructed.
  • the carcass C is fixedly placed on a rotating spindle M known in itself, for rotating around its own horizontal axis X.
  • the unit U comprises and extruder group 1 able to extrude the rubber, in order to make a rubber strip and feed the strip itself to a distribution group 2 connected to the extruder group 1 through a tubular linear hollow duct 3, in which a flow of extruded rubber passes, in order to define an extrusion system S substantially horizontally extending and transversally with respect to the axis X.
  • the distribution group 2 comprises a head 4 for applying the extruded rubber film, substantially L-shaped or "duck beak” like, said head 4 being mounted on a rotary connection 5, actuated by a motor (known and not shown), preferably but not limited to permanent magnets, in order to permit the rotation of the head 4 around its own vertical axis Y in both ways, clockwise or anticlockwise, up to cover at least a rotation of 350°, such to efficiently operate both on the central, peripheral surface Sc and on the two sides F of the carcass C of the tire P ( Figures 1-4).
  • the connection 5 is connected to said duct 3.
  • the head 4 is also provided with an applicator/coating roll 6, able to be used, in contact and under pressure, through known and not shown means, with said central surface Sc and with the sides F of the carcass C, to distribute with a spiral way on the surfaces themselves the extruded rubber layer or film, during the rotation of the carcass C.
  • the unit U is also provided for the application of the so-called "rubber dust coat", and it is also provided with planes for pressing the first part and for interrupting the end part.
  • the functionality of the unit U is as follows: Following the charging on the spindle M with an expansion of the carcass C of the tire P, it is then necessary to expand the tire itself with compressed air. With the tire P fixed and inflated, the unit U, after having followed the identification steps of the carcass C and after having detected its outer profile, proceeds in moving in a horizontal plan the extruder group 1 , to proximate the head 4 to the carcass C, and to permit to the head 4 itself to start with the extrusion of the layer of film to be extruded, by coating and pressing the same at the first time on the side F of the carcass C, by means of the roll 6.
  • the head 4 and the roll 6 could realize the distribution and application in a spiral way of rubber layer or film on the central surface Sc, in order to recreate the thickness of raw material, suitable for the final use of the tire.
  • the unit U and the consequent rubber extrusion will be placed in a stop position, such as the rotation of the carcass C.
  • a stop position such as the rotation of the carcass C.

Landscapes

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

Abstract

L'invention concerne une unité (U) pour l'application d'une bande de caoutchouc extrudé sur une carcasse (C) d'un pneumatique (P) à reconstruire. L'unité comprend un groupe d'extrudeuse (1) apte à extruder le caoutchouc, et à définir une bande de caoutchouc extrudé et à alimenter la bande elle-même à un groupe de distribution (2), relié audit groupe d'extrudeuse (1) par un moyen conducteur (3); ledit groupe de distribution (2) comprenant une tête (4) pour l'application d'une couche ou d'un film de caoutchouc extrudé sur ladite carcasse (C), ladite tête (4) étant sensiblement en forme de L et montée sur un élément de liaison rotatif (5), apte à permettre la rotation de la tête (4) elle-même autour de son axe (Y) dans les deux sens, et à distribuer et revêtir sous une pression ladite couche à la fois sur la surface centrale, périphérique (Sc) et les côtés (F) de ladite carcasse (C) dudit pneumatique (P) au cours d'un mouvement rotatif de ladite carcasse (C) autour d'un axe (X).
PCT/IB2015/051608 2014-03-06 2015-03-05 Unité pour l'application d'une bande de caoutchouc extrudé sur une carcasse de pneumatique WO2015132749A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVR20140057 2014-03-06
ITVR2014A00057 2014-03-06

Publications (1)

Publication Number Publication Date
WO2015132749A1 true WO2015132749A1 (fr) 2015-09-11

Family

ID=50625038

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/051608 WO2015132749A1 (fr) 2014-03-06 2015-03-05 Unité pour l'application d'une bande de caoutchouc extrudé sur une carcasse de pneumatique

Country Status (1)

Country Link
WO (1) WO2015132749A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1426617A (fr) * 1964-04-11 1966-01-28 Continental Gummi Werke Ag Machine pour la mise en place de couches en caoutchouc, ou matière synthétique analogue sur des corps notamment sur des pneumatiques ainsi que les corps tels pneumatiques conformes à ceux obtenus
US4240863A (en) * 1979-04-12 1980-12-23 Caterpillar Tractor Co. Control system for an elastomer extrusion and applicator apparatus
US20070029029A1 (en) * 2005-08-04 2007-02-08 Koch Brian R Method for forming elastomeric tire component and a tire
US20070199661A1 (en) * 2003-11-21 2007-08-30 Michelin Recherche Et Technique S.A. Process for laying a strip continuously on a toroidal surface
US20080257476A1 (en) * 2004-09-30 2008-10-23 Giovanni Pozzati Method and Apparatus for Manufacturing Pneumatic Tyres
WO2008141871A1 (fr) * 2007-05-11 2008-11-27 Societe De Technologie Michelin Buse articulee et procede d ' application d ' une bandelette en materiau viscoelastique qui utilise ladite buse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1426617A (fr) * 1964-04-11 1966-01-28 Continental Gummi Werke Ag Machine pour la mise en place de couches en caoutchouc, ou matière synthétique analogue sur des corps notamment sur des pneumatiques ainsi que les corps tels pneumatiques conformes à ceux obtenus
US4240863A (en) * 1979-04-12 1980-12-23 Caterpillar Tractor Co. Control system for an elastomer extrusion and applicator apparatus
US20070199661A1 (en) * 2003-11-21 2007-08-30 Michelin Recherche Et Technique S.A. Process for laying a strip continuously on a toroidal surface
US20080257476A1 (en) * 2004-09-30 2008-10-23 Giovanni Pozzati Method and Apparatus for Manufacturing Pneumatic Tyres
US20070029029A1 (en) * 2005-08-04 2007-02-08 Koch Brian R Method for forming elastomeric tire component and a tire
WO2008141871A1 (fr) * 2007-05-11 2008-11-27 Societe De Technologie Michelin Buse articulee et procede d ' application d ' une bandelette en materiau viscoelastique qui utilise ladite buse

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