Extrusion blow molded PET container and method of making
View Patent ↗A plastic container that is fabricated from an extrudable polyethylene terephthalate (PET) using an extrusion blow molding process includes a neck portion, a bottom portion and a main body portion. The main body portion has a central opening that extends completely through the main body portion and may have generally toroidal area surrounding the central opening. The bottom portion includes a plurality of support feet and a substantially smooth central raised portion that has substantially no discontinuities such as the gate well that is commonly found on PET containers fabricated using the conventional stretch blow molding process. The neck portion may be offset from a longitudinal axis of the container so as to facilitate pouring by a consumer.
1. A method of making a plastic container, comprising:
continuously extruding a parison fabricated from a material comprising polyethylene terephthalate (PET);
capturing a portion of the parison within a mold;
inflating the captured portion of the parison against the mold to form a container blank having a main body portion having a central recess closed with flash; and
trimming the flash from the central recess of the container blank to form a PET container having a main body portion including a liquid holding central toroidal portion forming part of a handle shaped and sized to facilitate gripping and defining a central opening substantially surrounded by the central toroidal portion extending completely through the container, the handle having a first maximum width and an opposing portion of the liquid holding central toroidal portion having a second maximum width greater than the first maximum width.
2. A method of making a plastic container according to claim 1 , wherein the generally toroidal body portion has a width that is within a range of about 1.2 inches to about 3.2 inches.
3. A method of making a plastic container according to claim 2 , wherein the generally toroidal body portion has a depth that is within a range of about 1.8 inches to about 3.2 inches.
4. A method of making a plastic container according to claim 1 , wherein the container blank further has a finish portion that is offset from a central longitudinal axis of the container blank.
5. The method of making a plastic container according to claim 1 , wherein the central toroidal portion extends laterally outwardly relative the first and second sidewalls.
6. The method of making a plastic container according to claim 1 , wherein the container further has a bottom portion extending from the main body portion and defining a plurality of support feet.
7. The method of making a plastic container according to claim 6 , wherein the plurality of support feet are disposed on each of a first side of the bottom portion having a first width and an opposing second side of the bottom portion having a second width greater than the first width.
8. The method of making a plastic container according to claim 6 , wherein the bottom portion further includes a smooth central raised portion defined therein.
9. The method of making a plastic container according to claim 1 , wherein the handle has a first maximum depth and the opposing portion has a second maximum depth greater than the first maximum depth.
10. A method of making a plastic container, comprising:
continuously extruding a parison fabricated from a material comprising polyethylene terephthalate (PET);
limiting exposure of the material to moisture;
capturing a portion of the parison within a mold;
inflating the captured portion of the parison against the mold to form a container blank having a main body portion having a central recess closed with flash; and
trimming the flash from the central recess of the container blank to form a PET container having a main body portion including a liquid holding part central toroidal portion forming part of a handle shaped and sized to facilitate gripping and defining a central opening extending completely therethrough, the handle having a first maximum width and an opposing portion of the liquid holding central toroidal portion having a second maximum width greater than the first maximum width.
11. A method of making a plastic container according to claim 1 , wherein limiting exposure of the material to moisture comprises creating a shroud to control the relative humidity of ambient gaseous environment proximate the mold.
12. A method of making a plastic container according to claim 10 , wherein the generally toroidal body portion has a depth that is within a range of about 1.2 inches to about 3.2 inches.
13. The method of making a plastic container according to claim 10 , wherein the main body portion has a central toroidal portion extending laterally outwardly relative the first and second sidewalls.
14. The method of making a plastic container according to claim 10 , wherein the container further has a bottom portion extending from the main body portion and defining a plurality of support feet.
15. The method of making a plastic container according to claim 14 , wherein the plurality of support feet are disposed on each of a first side of the bottom portion having a first width and an opposing second side of the bottom portion having a second width greater than the first width.
16. The method of making a plastic container according to claim 14 , wherein the bottom portion further includes a smooth central raised portion defined therein.
17. The method of making a plastic container according to claim 10 , wherein the handle has a first maximum depth and the opposing portion has a second maximum depth greater than the first maximum depth.