SAC EN PELLICULES THERMOPLASTIQUES COMPOSITES POUR EXTRAIRE ET CONSERVER DES SOLUTIONS DE PERFUSION, EN PARTICULIER DU SANG DE TRANSFUSION ET PROCEDE POUR LA FABRICATION DE CE SAC

L'INVENTION CONCERNE UN SAC EN PELLICULES THERMOPLASTIQUES COMPOSITES AVEC UNE TETE ET DES TUBES ET DES PAROIS RECTANGULAIRES DE CHLORURE DE POLYVINYLE ET DE POLYOLEFINE, CES DERNIERES ETANT PLACEES A L'INTERIEUR DU SAC.SELON L'INVENTION, LE SAC PRESENTE UNE TETE RENFORCEE 6 FORMEE EN AJOUTANT ET EN SOUDANT A HAUTE FREQUENCE UNE PARTIE DE LA PELLICULE OBTENUE DES PAROIS 2 3 DU CORPS 1A DU SAC A LA COUCHE DE PCV A L'INTERIEUR DE LA TETE 6 ET EN CONTACT AVEC LES TUBES 5.L'INVENTION S'APPLIQUE NOTAMMENT A L'EXTRACTION ET LA CONSERVATION DE SOLUTIONS DE PERFUSION. A bag (1), particularly for transfusion blood, has a reinforced head (6), equipped with tubes (5) for feeding and drawing a liquid to be retained in the bag, and substantially rectangular walls made of a composite thermoplastic film of bonded or coextruded layers of polyvinylchoride (2) and a polyolefin (3), the polyolefinic layers being located at the interior of the bag. The reinforced head is formed by over- turning the composite film forming the bag body or by application of a portion of the same composite film as is used to form the bag body, and by welding, the part of the composite thermoplastic film forming the reinforced head having a PVC layer located at the interior of the reinforced head and closely in contact with the feeding and drawing tubes.