Preform and a mold stack for producing the preform
There is provided a preform, and a mold stack for producing the preform. For example, there is provided a preform suitable for subsequent blow-molding. The preform includes a neck portion, a gate portion, and a body portion, extending between said neck portion, and said gate portion. The gate portion, has a conical shape. In an example embodiment, the conical shape is selected such that to 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 directly in a vestige portion having a size that corresponds to the size of an orifice of a hot runner nozzle used for manufacturing the preform; and wherein the conical shape has a straight profile, whereby the angle of refraction of rays used during a re-heating stage of a blow-molding process is homogenized.
2. The preform of claim 1 , wherein the gate portion comprises an even wall thickness.
3. The preform of claim 1 , wherein the conical shape has an angle defined between an imaginary central line and an internal surface of the conical shape.
4. The preform of claim 3 , wherein said angle has been selected as a function of and depends on a refraction index of a material being used for forming the preform such that to homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
5. The preform of claim 3 , wherein said angle has been selected as a function of and depends on 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 homogenize angle of refraction of rays used during a re-heating stage of a blow-molding process.
6. 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 directly in a vestige portion that has a size that corresponds to the size of an orifice of a hot runner nozzle used for manufacturing the preform and wherein the conical shape has a straight profile.