| 摘要 |
<p>A plastic container includes a body of one-piece integrally blow-molded construction.The body has an hourglass shape in side elevation with a waist, a base and a shoulder,and at least one helical external rib extending at least one full turn around thewaist. The hourglass shape provides as a result of the blow molding operationminimum hoop stretch and extra thickness and strength at the waist, and maximumhoop stretch and minimum thickness at the shoulder and base. The helical rib atthe waist of the container gives mechanical stiffness and resiliency for grippingand squeezing the container at the waist, yet allows angular movement of the shoulderwith respect to the base to enhance flexibility.</p> |
