Method for shaping cover materials

Details Method for shaping cover materials Method for shaping cover materials

B - Operations, Transporting

29

C

B29C 44/10 (2006.01) B29C 43/18 (2006.01) B29C 44/04 (2006.01) B29C 44/16 (2006.01) B29C 44/56 (2006.01) B29C 33/68 (2006.01)

Patent

CA 2134236

A method for three-dimensionally shaping cover materials such as woven or knitted fabrics, vinyl, leather, and the like is performed by providing a cover material (18) and a layer of foamable liquid reaction mixture such as polyurethane which changes from liquid to a viscous state (16') at the beginning of the gas generating reaction, compressing the combined cover material and the foamed layer in a mold (21, 22) having surface configurations corresponding to desired final three-dimensional shapes with the compression being performed when the foam layer has substantially completed rising, but before substantial curing thereof takes place, and then allowing the foamed layer bonded to the cover material to proceed in curing reaction. The three-dimensional cover material shaping is performed by this method without external heat or high pressure so that the cover material can retain its original appearance and high quality. By changing locally the spacings between mold halves (21, 22), the resultant foam layer bonded to the cover material can be provided with portions having different local thicknesses and hardnesses.

L'invention concerne une méthode permettant de façonner en trois dimensions des matériaux de recouvrement tels que des tissus tissés ou à mailles, du plastique vinylique, du cuir ou d'autres produits semblables. Les matériaux sont façonnés en prenant un matériau de recouvrement (18) et une couche de mélange réactionnel de liquide moussant, tel que la polyuréthanne qui passe de l'état liquide à l'état visqueux (16') au début de la réaction produisant du gaz, et en les comprimant dans un moule (21, 22) dont la configuration de surface correspond aux formes finales en trois dimensions recherchées. Toutefois, la compression est effectuée lorsque la couche de mousse a essentiellement terminé de lever, mais avant qu'elle commence à durcir de façon considérable, puis on laisse durcire cette couche collée au matériau de recouvrement. La méthode permet de façonner le matériau de recouvrement en trois dimensions sans utiliser de chaleur externe ou une pression élevée. Ainsi, le matériau de recouvrement conserve son apparence initiale et sa qualité supérieure. En changeant localement les espacements entre les moitiés de moules (21, 22), la couche de mousse obtenue, collée au matériau de recouvrement, peut présenter différentes hauteurs et duretés à différents endroits.

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