The present invention provides for an improved device for molding keyhole sipes larger in size, i . e . sipes having a wider passage, than currently being formed in treads that will avoid damaging the tread during formation and removal thereof from a mold. The device (10) includes an elongated deformable body member (16) having a blade (18) extending in a direction away therefrom and substantially along the length thereof. The body member also includes a stiffening member (32) securely fixed in position therein that extends substantially the length thereof. The stiffening member provides a desired rigidity to the deformable body member, thereby limiting flexion along its length under the stress of a rubber formulation when the mold is closed during the molding process. Also, the deformable body member provides low stress on the tread when a slit of the keyhole sipe is pulled around the body member during removal of the tread from a mold.


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    Title :

    Mold with a device for molding a keyhole sipe in a tire tread


    Additional title:

    Form mit einer Vorrichtung zum Formen eines schlüssellochförmigen Einschnitts in einer Reifenlauffläche
    Moule pourvu d'un outil pour mouler une incision en forme de trou de serrure dans une bande de roulement de pneumatique



    Publication date :

    2016-04-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B29D PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE , Herstellen besonderer Gegenstände aus Kunststoff oder aus Stoffen in plastischem Zustand / B29C Formen oder Verbinden von Kunststoffen , SHAPING OR JOINING OF PLASTICS / B60C VEHICLE TYRES , Fahrzeugreifen



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