Container side wall with ribs causing a predefined varying thickness

A preform for blow molded containers comprising:

• a side wall, where an inside surface of the side wall is of a predefined varying topography;
• an open top formed at a top end of the side wall;
• and
• a bottom wall merging with a bottom end of the side wall and closing the bottom end of the side wall.

A mold for use in an injection molding machine, comprising:

• a first half and a second half of a mold shell, the first half and the second half cooperating to form a cavity therebetween, the cavity defining an exterior side wall and bottom wall, the cavity further including an aperture being capable of receiving molten plastic;
• a core for cooperating with the mold shell and for defining an interior side wall and bottom wall;
• and
• a plurality of channels formed upon the side wall of the core, where the channels are used to mold the molten plastic to form a preform side wall having a predefined varying thickness.

A method for producing a hollow-structured injection molded plastic container, comprising:

• injection molding a preform comprised of a side wall with a closed bottom end, where an inside surface of the side wall is of a predefined varying topography;
• cooling the preform to a predetermined temperature;
• stretching the preform to a desired length;
• and
• blow molding the preform to a desired shape, where the side wall maintains a varying thickness.

A method for producing a hollow-structured injection molded plastic container, comprising:

• injection molding a preform comprised of a side wall and a closed bottom end, where the side wall is of a predefined varying thickness;
• heating the preform to a desired temperature;
• stretching the preform to a desired length;
• and
• blow molding the preform to a desired shape, where the side wall maintains a varying thickness.