Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Establissements Michelin

Michelin Recherche Et Technique

Compagnie Generale Des Etablissements

Bernard Villeneuve

Anthony Gueugneau

Christian Gomet

Jonathan Lejeune

Gael Roty

Romain Calvel

David Dean

Khotchakorn Pengsaloong

Ludovic Greverie

Olivier Muhlhoff

Jose Merino Lopez

Hélène Emorine

Richard Abinal

Jacky Pineau

Richard Barriere

Jean-Claude Desvignes

Philippe Souyri

Patrick Dayet

Julien Besset

Gaël Roty

Anne-Laure Fraenkel

Wilfried Chades

Jean-Pierre Queslel

A molding element having a molding surface forming a contact face and a groove forming rib portion forming the groove comprising two opposed rib side faces and a rib top face connecting two rib side faces. The groove forming rib portion provides at least one space opening to at least one of the rib side faces and/or to the rib top face. An insert is received in the space. The insert comprises a cavity for forming a closing device in the groove. The cavity has two opposed cavity faces and opens to at least two faces of the insert corresponding to the faces of the groove forming rib portion. The insert comprises at least one cutting means extending and/or projecting in a direction the groove forming rib portion extends for cutting a material filled in the cavity during demolding.

Molding element for manufacturing a noise reducing tread

The molding element has a molding surface forming a contact face and a groove forming rib portion forming the groove comprising two opposed rib side faces and a rib top face connecting two rib side faces. The groove forming rib portion provides at least one cavity opening to the rib top face and to at least one of the rib side faces. The cavity has two opposed cavity faces. The molding element comprises at least one cutting means extending and/or projecting in a direction the groove forming rib portion extends for cutting a material filled in the cavity during demolding.

A tire () comprises a sidewall () and an attachment bead () extending the said sidewall () and designed to be attached to a rim of a wheel of a motor vehicle. A mould () for vulcanizing a tire comprises a lateral part () designed to mould the sidewall () of the tire and a lower partdesigned to mould the attachment bead (). The lateral partand the lower partat least partially delimit a tire receiving space (E) designed to receive the tire that is to be vulcanized in the mould (). The mould comprises a slot () extending the tire receiving space (E) and the slot () is at least partially moulded by the lower partof the mould ().

Mold for vulcanizing a tire

The prediction model includes the steps of calculating a surface area Sof a control mold, measuring the force Ffor demolding from the control mold, determining first and second test specimens with respective surface areas S, S', measuring the force Ffor demolding from the first test specimen, measuring the force F&#x2032;for demolding from the second test specimen, calculating the ratio of Sand S&#x2032;so as to define a test specimen surface area ratio R, calculating the ratio of the force Ffor demolding from the first test specimen and F&#x2032;for demolding from the second test specimen so as to define a force ratio R, measuring the molding surface area Sof a mold to be measured and calculating the force Ffor demolding from the mold to be measured such that F=F&#xd7;S/S&#xd7;R/R.

Surface demoldability prediction model

Die () representing a tread pattern model for a tread of a tire to be molded, said die being made up of a die body () and at least one insert () attached to the body of said die, covering at least one of the surfaces of the grooves () in the body (), the insert having at least one substantially flat surface provided with textures.

Die having textured inserts for manufacturing a textured mould for moulding and vulcanizing tires

Die () representing a tread pattern model for a tread of a tire to be molded. The die is made up of a plurality of blocks () separated by grooves (), at least a part of the die having surfaces provided with textures ().

Textured die having blocks for manufacturing a textured mould for moulding and vulcanizing tires

A tire () made of rubber material, comprising a tread (), said tread having a tread surface () intended to come into contact with a road surface when the tire is being driven on, this tread surface having, in cross section, a certain curvature. The tread surface () comprises, over at least 80% of its surface, a texture () contrasting with the rest of the tire, this texture () having a plurality of elements that protrude from or are recessed into the tread surface (), and each element extends perpendicularly (&#x3b8;=90&#xb0;)to the tread surface () along the curvature of this tread surface ().

Tire including a high-contrast texture on the tread surface

The demoldability prediction model includes the steps of choosing a mold specimen; choosing a reference material; measuring the force Ffor demolding the reference material from the mold specimen; determining the force Mfor demolding the reference material from the control test specimen; selecting a material to be measured; determining the force M for demolding the material from the control test specimen; calculating the ratio of the forces Mfor demolding the reference material and M for demolding the material from the control test specimen so as to define a coefficient C of material impact; and calculating the force F for demolding the material such that F=C&#xd7;F.

Demoldability prediction model

A mold for vulcanizing and molding a tire is disclosed herein. The tire includes a tread delimited by two sidewalls, and the mold includes a ring for molding the tread of the tire and two shells having tire-molding surface features for molding the sidewalls. At least one of the shells has a removable shell part extending circumferentially on the side of the sidewall of the tire to be molded, with the tire-molding surface features being incorporated into the removable shell part.

Mold for a tire having a shell with removable parts

A mold for vulcanizing and molding a tire is provided herein. The tire includes a tread delimited by two sidewalls, the mold including a ring for molding the tread of the tire and two shells for molding the sidewalls. The mold includes an annular groove extending in a recessed manner in one of the shells and an insert housed in the groove, this insert having tire marking elements and being formed from a plurality of insert parts that are positioned one after another in the annular groove.

Mold for a tire with an annular insert made up of a plurality of portions

A mold for vulcanizing and molding a tire, this tire including a tread delimited by two sidewalls, the mold including a ring for molding the patterns of the tread of the tire and two shells for molding the sidewalls, the mold including an annular groove extending in a recessed manner in one of the shells and an insert housed in the groove, this insert having tire-molding surface features, characterized in that the molding surface features of the insert include tire tread pattern elements extending in line with the patterns of the tread.

Mold for tire having an annular insert for molding a tread pattern

A molding element for a mold for vulcanizing a tread of a tire, comprising a base able to mold part of the tread surface of the tread and a bar able to mold a groove in the tread, the bar comprising two longitudinal faces extending along its length and projecting from the base and an upper face connecting the longitudinal faces. The molding element comprises a contact edge formed by the base and the bar, intended to come into contact with another molding element to form all or part of the vulcanizing mold, and further comprising at least one recess in the bar, which opens onto the upper face and onto the contact edge, but does not open onto the longitudinal faces of the bar.

Mold comprising a cavity for molding a closing-off device in a groove

A molding element for a mold for vulcanizing a tread of a tire, comprising a base able to mold part of the tread surface of the tread and a bar able to mold a groove in the tread, the bar comprising two lateral faces extending along its length and projecting from the base and an upper face connecting the lateral faces. The molding element comprises a contact edge formed by the base and the bar, intended to come into contact with another molding element to form all or part of the vulcanizing mold, and further comprising at least one recess in the bar, which opens onto one of the lateral faces and onto the contact edge, but does not open onto the upper face of the bar.

Mold comprising a cavity for molding a device for closure in a groove

A mold for vulcanizing and molding a tire, the tire having a tread delimited by two sidewalls, at least one of which is provided with a complex protuberance, the mold having a ring for molding the tread of the tire and two shells for molding the sidewalls, the mold having an annular insert that separates the mold into at least two portions, namely a ring portion and a shell portion in the radially lower region of the sidewalls, the insert having two adjacent concentric elements that are intended to mold the complex protuberance, namely a radially outer element associated with the ring, and a radially inner element associated with the shell.

Mold for tire having a removable annular insert

Provided is a pneumatic tire capable of yielding excellent water-draining performance, while reducing air column resonance. This pneumatic tire () has a tread () and at least one ply () arranged toward the interior of the tread in the radial direction. The tread has at least one main channel () and a flexible fence () formed inside the main channel. The main channel has a bottom () and opposing first and second wall surfaces (). The flexible fence extends along the width of the main channel so as to block at least 70% of a cross sectional area of the main channel, and is arranged at intervals so that at least one is present in the main channel in the tread footprint when the tire rolls. A plurality of recesses having an opening that opens in the main channel are formed on the bottom, first wall surface and/or second wall surface of the main channel, the flexible fence being connected to the recess and extending into the main channel via the opening of the recess.

Growing community of inventors

Clermont-Ferrand, France

Bernard Villeneuve