B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/48 (2006.01)
Patent
CA 2642305
The invention relates to a mould base (1) for a mould that is used for the blow moulding or stretch-blow moulding of thermoplastic containers (2) having a petaloid-shaped base. The mould base (1) includes several cavities (11) separated by radiating ridges (13) with concave crests (14), the bases (15) of the cavities (11) being distributed along a circular contour. As seen radially on either side of the deepest point thereof, each cavity (11) is defined towards the exterior by a curved surface portion (18) having a circular arc radial cross-section and towards the interior by a broken-plane surface portion (19) with at least two slopes that intersect the curved surface portion (18) at a straight edge (20). The plane (T) which contains the aforementioned edge (2) and which is tangent to the curved surface portion (18) is perpendicular to the axis (12) of the mould base. Moreover, the portion of plane (21) adjacent to the curved surface portion (18) has a slope (.alpha.) of between 12° and 8° in relation to the tangent plane (T).
Fond (1) de moule pour un moule de soufflage ou étirage-soufflage de récipients (2) thermoplastiques à fond pétaloïde ; le fond (1) de moule comporte plusieurs cavités (11) séparées par des dorsales (13) rayonnantes à crête (14) d'étendue concave, les fonds (15) des cavités (11) étant distribués sur un contour circulaire ; chaque cavité (11) , considérée radialement de part et d'autre de son point le plus profond, est définie vers l'extérieur par une portion de surface (18) courbe à section radiale en arc de cercle et vers 1 ' intérieur par une portion de surface (19) en plan brisé à au moins deux pentes intersectant la portion de surface (18) courbe selon une arête (20) droite, le plan (T), contenant l'arête (20) et tangent à la portion de surface (18) courbe, étant perpendiculaire à l'axe (12) du fond de moule et la portion de plan (21) adjacente à la portion de surface (18) courbe ayant une pente (.alpha.) comprise entre 12° et 8° par rapport au plan tangent (T) .
Meillerais Sylvain
Penet Laurent
Goudreau Gage Dubuc
Sidel Participations
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