Preform for a container made of plastics material
AssigneeSidel Participations
InventorMickaël LETESTU
Life of this patent
Estimating the term…
Abstract
Provided is a plastic preform for manufacturing containers by stretch-blow molding, having a body rotationally symmetrical about a vertical central axis, an outer wall, and an inner wall. The preform has an open neck that extends as a continuation from an upper end of the body, and a base which closes the body at a lower end. The base is rotationally symmetrical about the central axis and the body has, over a cone height Hc, from an annular collar towards the base, a conical outer wall and/or a conical inner wall, where the walls include means suitable for reducing the intensity of the refracted ray and/or for modifying the angle of said refracted ray, the incident radiation source being located outside said preform.
Claims13
A preform for manufacturing containers made of plastics material by stretch-blow molding, the preform comprising:
- at least a body that is rotationally symmetrical about a vertical central axis, the body having an outer wall and an inner wall, the radial distance between the outer wall and the inner wall defining a wall thickness;
- an open neck that extends as a continuation of the body from an upper end thereof, the neck being separated from the body by an annular collar;
- and
- a base that closes the body from a lower end thereof, the base being rotationally symmetrical about the central axis, and the body having, over a cone height Hc, from the annular collar towards the base, a conical outer wall and/or a conical inner wall, wherein the conical outer wall and/or the conical inner wall comprises, over all or part of the cone height Hc, a means suitable for reducing the intensity of the refracted ray and/or for modifying the angle of the refracted ray,
- wherein an incident radiation source is located outside the preform.
A method for manufacturing a container by blow molding or stretch-blow molding, comprising at least the following steps:
- providing a preform;
- heating the body of the preform by exposure to monochromatic or quasi-monochromatic infrared radiation of predetermined intensity;
- and
- forming the container by injecting a pressurized fluid into the preform preheated in this way,
- wherein the preform comprises:
- at least a body that is rotationally symmetrical about a vertical central axis, the body having an outer wall and an inner wall, the radial distance between the outer wall and the inner wall defining a wall thickness;
- an open neck that extends as a continuation of the body from an upper end thereof, the neck being separated from the body by an annular collar;
- and
- a base that closes the body from a lower end thereof, the base being rotationally symmetrical about the central axis, and the body having, over a cone height Hc, from the annular collar towards the base, a conical outer wall and/or a conical inner wall, wherein the conical outer wall and/or the conical inner wall comprises, over all or part of the cone height Hc, a means suitable for reducing the intensity of the refracted ray and/or for modifying the angle of the refracted ray, and
- wherein an incident radiation source is located outside the preform.
A mold for forming a preform, the mold comprising a mold body having a lateral wall shaped to match an outer face of the body of the preform and a mold base shaped to match an outer face of the base of the preform and a core shaped to match an inner face of the preform;
- and
- wherein the preform comprises:
- at least a body that is rotationally symmetrical about a vertical central axis, the body having an outer wall and an inner wall, the radial distance between the outer wall and the inner wall defining a wall thickness;
- an open neck that extends as a continuation of the body from an upper end thereof, the neck being separated from the body by an annular collar;
- and
- a base that closes the body from a lower end thereof, the base being rotationally symmetrical about the central axis, and the body having, over a cone height Hc, from the annular collar towards the base, a conical outer wall and/or a conical inner wall, wherein the conical outer wall and/or the conical inner wall comprises, over all or part of the cone height Hc, a means suitable for reducing the intensity of the refracted ray and/or for modifying the angle of the refracted ray.
Dependencies are inferred from the claim text.