Preform and a mold stack for producing the preform
A preform and a mold stack for producing the preform. For example, there is provided a preform suitable for subsequent blow-molding. The preform comprises a neck portion; a gate portion; and a body portion extending between said neck portion and said gate portion; the gate portion having a conical shape, wherein the conical shape terminates at a vestige portion having a size that substantially corresponds to the size of an orifice of a hot runner nozzle used in manufacturing the preform. In an example embodiment, the conical shape is selected such that to substantially homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
1. A preform suitable for subsequent blow-molding comprising:
a neck portion;
a gate portion; and
a body portion extending between said neck portion and said gate portion;
the gate portion having a conical shape, wherein the conical shape terminates at a vestige portion having a size that substantially corresponds to the size of an orifice of a hot runner nozzle used in manufacturing the preform.
2. The preform of claim 1 , wherein the conical shape is selected such that to substantially homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
3. The preform of claim 1 , wherein the gate portion comprises a substantially even wall thickness.
4. The preform of claim 1 , wherein the gate portion comprises a substantially non-even wall thickness.
5. The preform of claim 1 , wherein said conical shape comprises at least one internal curvature section.
6. The preform of claim 5 , wherein said at least one internal curvature section comprises a single curvature section located on an internal surface proximate to said vestige portion of the gate portion.
7. The preform of claim 1 , wherein the conical shape is associated with an angle defined between an imaginary central line and an internal surface of the conical shape.
8. The preform of claim 7 , wherein said angle is selected as a function of a refraction index of a material being used for forming the preform such that to substantially homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
9. The preform of claim 7 , wherein said angle is selected as a function of at least one of: (i) a refraction index of a material being used for forming the preform, (ii) a fill speed; and (iii) weight of material to be used such that to substantially homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
10. The preform of claim 1 , wherein said conical shape comprises a first cone and a second cone.
11. The preform of claim 10 , wherein said first cone is associated with a first angle defined between an imaginary central line and an internal surface of the conical shape and said second cone is associated with a second angle defined between the imaginary central line and the internal surface of the conical shape.