Process of forming polymeric material

A method of providing a thermoformed article, the method comprising

• providing a sheet comprising non-aromatic polymeric materials,
• conditioning the sheet with a rotating roller,
• transferring the sheet from the rotating roller to a rotary thermoformer having a rotation axis,
• thermoforming the sheet onto the rotary thermoformer to provide an article-blank web on a first portion of the sheet and a plurality of first protrusions on a second portion of the sheet located axially outward of the first portion of the sheet relative to the rotation axis to block the second portion of the sheet from curling away from a rotor of the rotary transformer, each protrusion of the plurality of first protrusions being elliptical in shape with converging pointed ends, the plurality of first protrusions including a first row of protrusions and a second row of protrusions adjacent to and axially inward of the first row of protrusions, the first row of protrusions oriented with the pointed ends of each protrusion of the first row of protrusions aligned in a first direction and the second row of protrusions oriented with the pointed ends of each protrusions of the second row of protrusions aligned in a second direction, the second direction different than the first direction, and
• cutting the article-blank web to provide the thermoformed article.