Patent ID: 6818174
Filing Date: 2004-11-16
Classification: B29C,B29L

Abstract:
A process for manufacturing a toothbrush comprising:a) providing a toothbrush mold having a head portion, a base portion, a toothbrush cavity located between said head portion and said base portion and having walls, an injection port for injecting molten plastic, and a gas injection port for injecting at least one gas, wherein the gas injection port is positioned in the end of the base portion of the mold so that gas is injected into the mold cavity substantially centrally thereof and in a direction parallel to the longitudinal axis of the mold, said injection port for the molten plastic being positioned in the center of the end of the base portion of the mold; b) injecting a predetermined amount of a molten plastic into the mold cavity to partially fill the cavity; and c) injecting at least one gas through the gas injection port to direct the molten plastic into contact with the walls of the mold cavity.