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US 11,731,315 B2Granted
Preform for a container made of plastic material
AssigneeSidel Participations
InventorsChristophe Bunel, Laurent Naveau
Life of this patent
Estimating the term…
Abstract
The invention concerns a preform for a container made of plastic material, comprising a cylindrical body that extends along an axis of revolution of the preform and a bottom that closes the cylindrical body. The bottom has an outer profile with a central portion and a curved portion joining the central portion to the cylindrical body. The central portion has, in longitudinal cross-section, a first concave section. The curved portion has successively, in longitudinal cross-section, from the first concave section towards the cylindrical body, a first convex or frustoconical section, a second concave section and a second convex or frustoconical section.
Claims17
A container preform (1) made of plastics material, comprising:
- a cylindrical body (3) extending along an axis of revolution (A) of the preform;
- a bottom (4) closing the cylindrical body (3),
- the bottom (4) having an outer profile (41) that has a central portion (5) and a curved portion (6) joining the central portion (5) to the cylindrical body (3), the central portion (5) having, in longitudinal section, a first concave section (52), the curved portion (6) having in succession, in longitudinal section, from the first concave section (52) toward the cylindrical body (3), a first convex or frustoconical section (61), a second concave section (62) and a second convex or frustoconical section (63), wherein the second convex or frustoconical section (63) has in succession, in longitudinal section, from the cylindrical body (3) toward the second concave section (62), a first radius of curvature (631), a second radius of curvature (632) and a third radius of curvature (633) and wherein said preform has a plane of intersection (P) defined by the junction between the cylindrical body (3) and the bottom (4), the plane of intersection (P) being perpendicular to the axis of revolution (A) of the preform (1), wherein the value of the first radius of curvature (631) is between 60% and 100% of the value of a radius of the cylindrical body (3) measured on the plane of intersection (P), and wherein the value of the second radius of curvature (632) is less than or equal to the value of a diameter of the cylindrical body (3) measured on the plane of intersection (P).
The preform (1) as claimed in any one of the preceding claims, wherein the bottom (4) has an inner profile (42) that defines with the second concave section (62) a reduction in the thickness of the bottom (4).
A container preform (1) made of plastics material, comprising:
- a cylindrical body (3) extending along an axis of revolution (A) of the preform,
- a bottom (4) closing the cylindrical body (3),
- the bottom (4) having an outer profile (41) that has a central portion (5) and a curved portion (6) joining the central portion (5) to the cylindrical body (3), the central portion (5) having, in longitudinal section, a first concave section (52), the curved portion (6) having in succession, in longitudinal section, from the first concave section (52) toward the cylindrical body (3), a first convex or frustoconical section (61), a second concave section (62) and a second convex or frustoconical section (63), wherein the second convex or frustoconical section (63) has in succession, in longitudinal section, from the cylindrical body (3) toward the second concave section (62), a first radius of curvature (631), a second radius of curvature (632) and a third radius of curvature (633) and wherein said preform has a plane of intersection (P) defined by the junction between the cylindrical body (3) and the bottom (4), the plane of intersection (P) being perpendicular to the axis of revolution (A) of the preform (1), and wherein the value of the first radius of curvature (631) is between 60% and 100% of the value of a radius of the cylindrical body (3) measured on the plane of intersection (P), and wherein the second concave section (62) has a point (621) of maximum penetration into the preform (1), situated at a distance from the axis of revolution (A) of the preform (1) of between 20% and 40% of a diameter of the cylindrical body (3) measured on the plane of intersection (P).
A container preform (1) made of plastics material, comprising:
- a cylindrical body (3) extending along an axis of revolution (A) of the preform,
- a bottom (4) closing the cylindrical body (3),
- the bottom (4) having an outer profile (41) that has a central portion (5) and a curved portion (6) joining the central portion (5) to the cylindrical body (3), the central portion (5) having, in longitudinal section, a first concave section (52), the curved portion (6) having in succession, in longitudinal section, from the first concave section (52) toward the cylindrical body (3), a first convex or frustoconical section (61), a second concave section (62) and a second convex or frustoconical section (63), wherein the second convex or frustoconical section (63) has in succession, in longitudinal section, from the cylindrical body (3) toward the second concave section (62), a first radius of curvature (631), a second radius of curvature (632) and a third radius of curvature (633) and wherein said preform has a plane of intersection (P) defined by the junction between the cylindrical body (3) and the bottom (4), the plane of intersection (P) being perpendicular to the axis of revolution (A) of the preform (1), and wherein the value of the first radius of curvature (631) is between 60% and 100% of the value of a radius of the cylindrical body (3) measured on the plane of intersection (P) and wherein, in longitudinal section, the second concave section (62) has a setback, with respect to a hemispherical outline (7) connecting the central portion (5) to the cylindrical body (3), of between 1% and 35% of a thickness of the cylindrical body (3), measured on the plane of intersection (P).
Dependencies are inferred from the claim text.