Abstract:
Process for producing tyres (3) comprising building a green tyre comprising two bead structures (6), each comprising a bead filler (7a), wherein the bead filler or another rigid component of the green tyre comprises a final elastomeric compound produced by feeding elastomeric polymer (102) and reinforcement filler (103) to a first batch mixing device (101); mixing and dispersing the reinforcement filler in the elastomeric polymer and unloading the obtained elastomeric compound; feeding the obtained elastomeric compound (104), along with at least 5 phr of reinforcement resin (111), to a continuous mixing device (106) of intermeshing and co-rotating twin-screw or multi-screw type or of planetary type; and mixing the reinforcement resin in the elastomeric compound and unloading the obtained elastomeric compound; feeding the obtained elastomeric compound (108) along with the components capable of facilitating the cross-linking (113) to a second batch mixing device (501) and mixing in a manner so as to obtain the final elastomeric compound (112), wherein the first and second batch mixing device have two counterrotating rotors.
Abstract:
A method of applying protective sheeting (12) of polymer material to a pipeline (P), preferably on a J-lay rig, includes the steps of driving a carriage along an annular path about the pipeline (P); extruding and simultaneously winding the protective sheeting (12) about the pipeline (P) by means of an end extrusion die (47) fitted to the carriage; compressing the protective sheeting (12) on the pipeline (P), directly downstream from the end extrusion die (47), so the protective sheeting (12) adheres to the pipeline (P); and controlling the drive, extrusion, and compression steps so that the time lapse between expulsion of a cross section (S1) of protective sheeting (12) from the end extrusion die (47) and compression of the same cross section (S1) of protective sheeting (12) is less than one second.
Abstract:
A method of forming a touch fastener product having a sheet-form base and an array of discrete fastener elements each extending from the base includes providing a molded sheet-form base and an array of discrete fastener element preforms, each preform extending from the base and including both a stem portion rising from the base and a head portion both contiguous with a distal end of the stem portion and having an upper surface directed away from the base, the head portion including at least one laterally directed extension overhanging the base in a primary lateral direction between exposed sides of the fastener element preform and ending at a distal, free tip; and then forming respective caps, of a cap material of a higher flex modulus than the resin of the preforms, on the upper surfaces of at least some of the molded fastener element preforms to form the discrete fastener elements.
Abstract:
A method of applying protective sheeting (12) of polymer material to a pipeline (P), preferably on a J-lay rig, includes the steps of driving a carriage along an annular path about the pipeline (P); extruding and simultaneously winding the protective sheeting (12) about the pipeline (P) by means of an end extrusion die (47) fitted to the carriage; compressing the protective sheeting (12) on the pipeline (P), directly downstream from the end extrusion die (47), so the protective sheeting (12) adheres to the pipeline (P); and controlling the drive, extrusion, and compression steps so that the time lapse between expulsion of a cross section (SI) of protective sheeting (12) from the end extrusion die (47) and compression of the same cross section (SI) of protective sheeting (12) is less than one second.
Abstract:
An extrusion device includes a sculpted extrusion die (100) comprising a pair of mating die lips (108, 110) having sculpted surfaces (118,120) and defining a die exit (112) for an extrudate. The contour of the sculpted surfaces (118, 120) is substantially similar to the contour of a juxtaposed surface (210) configured for receiving the extrudate from the die exit (112) of the sculpted extrusion die (210). The sculpted extrusion die preferably comprises a die lip adjustment mechanism (122) for adjusting a thickness of the extrudate exiting the die exit (112) and the thickness of the extrudate received on the juxtaposed surface (210). The air gap between the die exit (112) of the sculpted extrusion die and the juxtaposed surface (210) preferably is substantially eliminated by adjusting the distance between the sculpted surfaces (118,120) and the juxtaposed surface (210). A method of adjusting a thickness of a substantially continuous sheet of extrudate formed using an embodiment of the sculpted extrusion die (210) is also provided.
Abstract:
A profiled extrusion replication process is disclosed that includes steps of (a) extruding a molten material through an extrusion die having at least one profiled die lip to form a molten extrudate having first and second major extrudate surfaces and having a first structural feature in the first major extrudate surface; (b) bringing the molten extrudate into contact with a tool surface comprising one or more second structural features so as to cause a portion of the first structural feature in the first major extrudate surface to contact the one or more second structural features on the tool surface; and (c) cooling the molten extrudate to provide the structured film. Structured films and apparatus for making structured films are also disclosed.