Method and device for producing a polymer tape

B - Operations – Transporting – 29 – C

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B29C 55/06 (2006.01) B29C 43/22 (2006.01) F41H 5/04 (2006.01)

Patent

CA 2756860

The invention relates to a method for producing a highly oriented, high molecular weight polymer tape. The method comprises: a) forming a non-fibrous polymeric sheet; (30) b) rolling and stretching said sheet (30) to form a partially ori-ented polymer web; (31) c) drawing the partially oriented polymer web (31) to form an oriented non-fibrous polymer tape (33), the method is discontinuous in that the ingoing line speed of at least one method step differs from the outgoing line speed of the preceding method step. The invention also relates to a device for carrying out the method. The invention further relates to a mate-rial sheet comprising the polymer tapes. A ballistic resistant article comprising the material sheet exhibits excellent antiballistic properties.

L'invention porte sur un procédé de fabrication d'un ruban de polymère de masse moléculaire élevée, hautement orienté. Le procédé comprend les opérations consistant à : a) façonner une feuille polymère non fibreuse ; (30) b) laminer et étirer ladite feuille (30) pour former une nappe de polymère partiellement orientée ; (31) c) étirer la nappe de polymère partiellement orientée (31) pour former un ruban de polymère non fibreux orienté (33), le procédé est discontinu par le fait que la vitesse linéaire entrante d'au moins une étape de procédé diffère de la vitesse linéaire sortante de l'étape de procédé précédente. L'invention porte également sur un dispositif pour la mise en uvre du procédé. L'invention porte aussi sur une feuille de matière comprenant les rubans de polymère. Un article résistant balistique comprenant la feuille de matière présente d'excellentes propriétés antibalistiques.

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