Abstract: A method and device for producing vehicle tire bead-bead filler assemblies (2), whereby green elastomeric material is injected, by means of an externally-cooled distribution tank (38), into a number of annular chambers (22) defined by two half molds (6, 7) closed about a substantially cylindrical inner core (8); an inner portion of each chamber (22) being occupied by a respective bead (3) preassembled onto the core (8), and an outer portion (32) of each chamber (22) constituting the molding chamber of a respective bead filler (4).

Abstract: Handling means for the transportation of flexible sheet material comprises two work stations and a carrier (15) movable between the two work stations. The carrier is provided with means (12, 13) securely to support flexible sheet material (9) during its transport by the carrier between two work stations. The carrier preferably is flexible in a first direction whereby it may be deformed to follow a curved path (26) around a mandrel (25) at one work station. The carrier is thereby suited to receiving reinforced sheet material from a first mandrel (14) and applying it transposed, say through 90 degrees, around a second mandrel (25).

Abstract: An extrusion head (1) defined by a number of superimposed plates (7,8,9,10) and by a casing (55) housing the plates (7,8,9,10) and defining two shoulder surfaces (68,69) forming an angle and perpendicular to the plates (7,8,9.10); the plates (7,8,9,10), when packed together, defining an intermediate guide duct (35) for guiding reinforcing wires and two supply ducts (11,23) for supplying extruded elastomeric material located on opposite sides of the intermediate duct (35), and providing for locking together a wire guiding device (36) and a die (37) presenting respective flat shoulders (42,43;50,51) parallel to a first (68) of the shoulder surfaces (68,69) and pressed by the plates (7,8,9,10) into contact with one another and with the first shoulder surface (68), with the die (37) located between the first shoulder surface (68) and the wire guiding device (36).

Abstract: A method and device for manufacturing tire forming bladders (2), whereby a curing mold (3) defines, via first and second half molds (4, 5) and an inner core (6), an inner molding chamber (7) inside which a precured reinforcing ply (72) is optionally inserted; the mold (3) having an outer injection chamber (34) communicating with the inner chamber (7) and consisting of a variable-volume chamber of an injection cylinder (65); the outer chamber (34) being provided with a mass (35) of heated uncured rubber, which is injected into the inner chamber (7) with the mold (3) closed and, when cured, is extracted from the mold (3) by opening the inner chamber (7) and extracting the inner core (6).

Abstract: A method and device (1) for stabilizing a tire extracted at a relatively high temperature from a tire curing mold, whereby the tire (2) to be stabilized is inflated to a given pressure by a pressurized fluid, and cooled from the inside by circulating the pressurized fluid along a closed circuit (44) defined, at least partially, by the tire (2) and by a radiator (45) located outside thereof.

Abstract: Tire fabric woven from filling yarn which consists essentially of from 40% to 80% by weight of polyester and from 60% to 20% by weight of high wet modulus rayon and has a cotton count ranging from 10/1 to 40/1 and warp cords consisting of a material selected from the group consisting of nylon, polyester and rayon and having a weight-per-unit-length ranging from 2100 to 5000 denier, which has a filling of 1.0 to 3.0 picks per inch and a warp of 15 to 35 ends per inch.

Abstract: A method for the melt reaction of polyesters, particularly polyethylene terephthalate, with an alkylacetylacetonate endcapping agent which reacts with terminal carboxyl groups of the polyester to produce polyesters having reduced acidity and PET products produced by the method having reduced acid content.

Abstract: A process for preparing continuously tapered polymers and copolymers having a continuous change in microstructure along the polymer backbone is disclosed. The process produces polymers and copolymers with multiple glass transition temperatures of very small energy absorption, i.e. no definable glass transition temperature. The polymers have a flexible chain end and they progressively become stiffer along the length of the chain.

Abstract: Spin finish concentrate composition and the oil-in-water emulsion made from the concentrate for application for conventional speed or high speed melt spinning processes for producing polyester or polyamide yarns, consists essentially of oil lubricant component, pentaerythritol ester lubricant, ethoxylated sorbitan monooleate of HLB ranging from 6 to 15, anionic antistatic agent, water soluble sulfosuccinate wetting agent, and oil soluble ethoxylated polymethylsiloxane wetting agent having molecular weight of 400 to 700 and an aqueous surface tension value of less than 21 dynes/cm. The concentrate has long term stability. The finish prepared from the concentrate produces excellent quality yarn with virtually no broken filaments, and leaves no deposits on heated draw rolls, relaxation rolls and any yarn guides during spinning and drawing operations.

Abstract: Diene polymer or copolymer compositions having reduced hysteresis are provided. The compositions comprise a mixture of diene polymers or copolymers containing carbon-tin bonds in the main polymer or copolymer chains prepared by coupling polymer or copolymer chains with tin polyhalides and diene polymers or copolymer chains containing terminals derived from substituted imines having the formula: ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of H, alkyl, cycloalkyl, aryl, dialkylaminoaryl, aralkyl and aprotic O, N and S- containing alkyl, cycloalkyl, aryl and aralkyl groups; wherein R.sub.3 is selected from the group consisting of alkyl, cycloalkyl, aryl, dialkylaminoaryl, aralkyl and aprotic O, N, and S- containing alkyl, cycloalkyl, aryl and aralkyl groups; with the proviso that at least one of the R.sub.1, R.sub.2 and R.sub.3 groups must be a dialkylaminoaryl group and that not all of the R.sub.1, R.sub.2 and R.sub.

Abstract: An extrusion device (1) the extrusion head (2) of which features a number of superimposed shaped plates (9, 10, 11, 12) clamped together by a clamping device (3) located and operating externally of the extrusion head (2) about which it defines a releasable ring device; the extrusion device (1) having an automatic release device (4) for separating the shaped plates (9, 10, 11, 12) when the ring device is released.

Abstract: An apparatus and method for forming curing envelopes which apparatus and method enable the use of a conventional inner tube mold for making a curing envelope perform in the form of an envelope tube which may have a portion thereof easily removed to provide a curing envelope suitable for use in a tire retreading process. A curing envelope is made by placing an annular tube of uncured envelope material in a curing mold having a center core and a mold insert installed therein. The insert includes a pair of coaxial annular rings projecting radially outwardly from the center core and connecting straps for maintaining the axial spacing between the rings. The mold is closed and heat and internal pressure are applied to the envelope tube for curing the envelope tube and urging the tube against the interior cavity surface with the annular rings penetrating into the inner wall of the tube for forming therein corresponding annular grooves.

Abstract: An extruder head made up of several segments including a first section made up of at least two plates bolted together. At least one plate is hingeably mounted to another plate in the first section to provide access to an extrudate passage defined by the plates. Downstream of the first section is a pair of mating blocks bolted to the first section further defining the extrudate passage. Inserts of hardened steel are provided and held by the plates and blocks forming the extruder head and the inserts define parts of the extrudate passage. A cooling liquid chamber is provided in at least one insert to cool the wall forming the passage. Although the passage is continuously restricted in the downstream direction, to increase the pressure of the elastomeric melt, intermittent portions of a slightly greater cross-sectional area are provided to allow expansion and thus intermittent lower pressure of the melt as it passes through the passage.

Abstract: An extruder for elastomeric material has an axial screw in an extruder chamber defined by a cylindrical housing. Two radial planes of vented kneading pins are provided upstream of the extruder housing succeeded by spaced-apart planes of non-vented kneading pins. Each vented kneading pin includes small apertures at the inlet end of the pin which communicate with a stepped bore of gradually increasing crosssectional area from the inlet to the outlet thereof whereby gases within the elastomeric material can be vented through the apertures communicating with the stepped bore to the exterior of the extruder housing.

Abstract: A pneumatic safety tire, of the type preferably having a section height of five inches or greater, having a pair of crescent shaped elastomeric reinforcing members located between the innerliner and side wall and extending from adjacent the tread shoulders to at least the apex of the bead fillers of the tire. A pair of bias reinforcing plies are located between the elastomeric reinforcing members and the side walls of the tire and extend along the side walls from adjacent the tread shoulders to below the top most turn-up ends of the body ply. The elastomeric reinforcing members preferably are similar in composition to that of the bead fillers and have a low hysteresis value preferably within the range of 0.03 and 0.11, a high modulus preferably within the range of 2600 psi and 2800 psi and a Shore A hardness preferably within the range of between 85 and 91.