A tire vulcanization bladder assembly is manufactured by placing a first ring part on a base stage installed on leg parts in a periphery of a first end opening of a bladder; sandwiching a first clamp part of the bladder, the bladder being in an upright position with the first clamp part on a lower side and a second clamp part located in a periphery of a second end opening of the bladder on an upper side, by the first ring part, thereby attaching the first ring part to the bladder; inserting an inside ring member of a second ring part into the bladder from above on an inside ring member of the first ring part; moving the inside ring member of the second ring part upward relative to the bladder to a position of the second clamp part; and attaching the second ring part to the second clamp part.

A method in accordance with the present invention retreads an air maintenance tire. The method comprises the steps of: grinding remaining tread material from a tire casing for a worn air-maintenance tire; temporarily securing a contoured piece around a structure secured to the inner surface of the tire casing; placing a tread on the tire casing; inflating a bladder within an internal cavity of the tire casing and around the contoured piece whereby the bladder does not contact the structure; securing the tread to the tire casing; deflating the bladder; separating the tire casing and tread secured to the tire casing from the bladder; and removing the contoured piece from the tire casing.

Provided are a vulcanization device for a pneumatic tire and a method for vulcanizing a pneumatic tire. A pressurizing medium having a relatively low pressure is supplied through a pressurizing medium low-pressurization/supply line into a vulcanization bladder having a tube-like shape inserted into a green tire in a vulcanization mold to inflate the vulcanization bladder. Thereafter, a heating medium is supplied through a heating medium supply line into the vulcanization bladder (2). Then, a pressurizing medium having a relatively high pressure is supplied through a pressurizing medium supply line into the vulcanization bladder to increase internal pressure of the vulcanization bladder while the media in the vulcanization bladder are circulated through a circulation line extending outside the vulcanization bladder, thereby vulcanizing the green tire.

A vulcanizing bladder 3 comprises a first bladder 11 configured to contact with an inner circumferential surface of an unvulcanized tire (T) and a second bladder 12 arranged inside the first bladder 11. A first fluid G1 is to be supplied between the first bladder 11 and the second bladder 12, and a second fluid G2 is to be supplied to an inside of the second bladder 12. At least one of an inner circumferential surface 11s of the first bladder 11 and an outer circumferential surface 12s of the second bladder 12 is provided with a guide groove 31 extending in a tire axial direction through which the first fluid G1 can pass.

Techniques presented herein relate to vulcanizing equipment that includes a vulcanizing mold in which a vulcanizing cavity is formed, a vulcanizing bladder suitable for being placed in the vulcanizing cavity, and a supporting assembly that includes a center rod and a clamping device arranged on the center rod. The clamping device is suitable for installing the curing bladder in the cavity in a sealed manner. The vulcanizing equipment further includes a heating assembly and a gas circulation assembly that are arranged in the curing bladder in a stacked manner in the axial direction of the center rod. The gas circulation assembly is suitable for circulating a heated heating medium in the curing bladder. A driving assembly of the vulcanizing equipment includes a rotating shaft sleeve that is arranged on the outer side of the center rod in a clearance-fit manner and is connected to the gas circulation assembly.

Evaluation device and method for monitoring a vulcanization process of a vehicle tire in a tire heating press, wherein at least one sensor value and/or at least one control variable of the tire heating press is acquired, where the sensor value and/or the control variable is fed to an evaluation device that includes an ML model, and the evaluation device and/or the ML model outputs a warning notification when an evaluation of the at least one sensor value and/or the at least one control variable by the evaluation device reveals that there is a defect or an anomaly with the tire heating press or at least part of the tire heating press, or that there will be a defect or an anomaly with the tire heating press or at least part of the tire heating press in the foreseeable future.

The invention proposes a configuration applied to envelope for tire retreading in a cold retreading process. In the state of the art, envelopes consisting of two parts are known. However, the known methods of sealing among the pieces are not satisfactory either due to sealing problems, or by reducing the useful life of the envelope. In order to overcome these limitations, the invention proposes an envelope (20) comprising three parts (22, 24, 26), in which a flap (224) of the first part (22) presents a free end with a differentiated cross-section (224b), in which a flap (244) of the second part (24) has a free end with a differentiated cross-section (244b) and in which the third part (26) presents a shape of an elastic ring with enough width to cover the differentiated cross-section (224b) of the flap (224) of the first part (22) and the differentiated cross-section (244b) of the flap (244) of the second part (24).

A system and method for molding complex three-dimensional articles is disclosed. The system includes a mold for receiving an article made of at least one moldable material and, in one example, the article comprises at least one flat region and at least one radial region. The mold comprises an inner bladder that conforms to an inner surface of the article when pressurized and an outer mold that contacts an outer surface of the article. The system also includes an inner electrode spaced from an outer electrode, and a generator operable to generate an alternating electric field between the electrodes and across the article in the mold to obtain substantially even heating of the moldable material in the flat region and the radial region at the end of the heating cycle.

A process for producing tyres with auxiliary components for vehicle wheels is described. The process includes i) covering the external surface of an expandable chamber for tyre vulcanisation and moulding apparatuses with a first substantially cross-linkable polysiloxane composition and ii) covering the radially inner surface of the impermeable elastomeric material layer of the green tyre with a second substantially non-cross-linkable polysiloxane composition. An expandable chamber for tyre vulcanisation and moulding apparatuses and, a process for treating the expandable chamber are also described.

According to the present invention, a bladder assembly structure for detachably attaching a bladder to a tire vulcanization apparatus is proved, wherein it comprises: a lower clamp for fixing a lower side bead of the bladder and allowing a housing to be coupled thereto; and an upper clamp for fixing an upper side bead of the bladder and allowing an upper end of a center post penetrating the housing to be coupled, wherein the upper and lower clamps are made of lightweighted aluminum material.