Hot forming system to produce pre-cured innerliners

Details Hot forming system to produce pre-cured innerliners Hot forming system to produce pre-cured innerliners

B - Operations, Transporting

29

D

B29D 30/00 (2006.01)

Patent

CA 2352237

Method for providing precured innerliners (50) having a predetermined cross sectional profile for use as part of a pneumatic tire assembly used in a bladder-less shaping and vulcanizing mold. The innerliner (50) is formed from a continuous strip of elastomeric material (12) hot formed using a calender assembly (10) with a profiled calender roller (16). The formed strip is cured "in-line" in a press (38) having a profile matching platen (80) before being wound onto a tire building drum (48). After the pneumatic tire assembly is completed, the assembly is shaped and cured in a bladder-less mold, utilizing the precured innerliner as the impervious inner layer. Initially, the center region (62) of the innerliner is at least twice as thick as the lateral regions (72, 74). In the finished pneumatic tire, the innerliner exhibits a uniform thickness.

L'invention concerne un procédé d'apport de gommes intérieures (50) prédurcies dont le profil de la section transversale prédéterminé forme partiellement un pneu utilisé dans le formage sans vessie chauffante et dans une presse à vulcaniser. La gomme intérieure (50) est constituée d'une bande continue de matière élastomère (12) formée à chaud grâce à une calandre (10) dotée d'un cylindre profilé (16). La bande formée est durcie <= en ligne >= dans une presse (38) dont le plateau porte-moule (80) est ajusté au profil avant d'être enroulé autour d'un tambour (48) de fabrication des pneus. Une fois le pneu achevé, il est façonné et durci dans un moule sans vessie chauffante, la gomme intérieure prédurcie opérant comme couche intérieure imperméable. Au départ, la zone centrale (62) de la gomme intérieure est au moins deux fois plus épaisse que les zones latérales (72, 74). Dans le pneu terminé, la gomme intérieure présente une épaisseur uniforme.

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