초록 ▼

A plastic sealing ring is attached to a rim of a plastic container with an insert interposed between the rim and the sealing ring. By making the insert from a relatively rigid material, the insert can rigidify the sealing ring and hence the container. If the insert is made from an electrically condu

A plastic sealing ring is attached to a rim of a plastic container with an insert interposed between the rim and the sealing ring. By making the insert from a relatively rigid material, the insert can rigidify the sealing ring and hence the container. If the insert is made from an electrically conductive material, the insert can function to facilitate the induction welding of the sealing ring to the container. The sealing ring and insert can be formed as a unitary, composite sealing ring subassembly adapted for direct application to the rim of the container or they can be supplied as individual parts adapted to be applied to the rim of the container separately. In order to form the sealing ring subassembly, the sealing ring is molded from molten plastic. During the cooling of the sealing ring, the insert is positioned in a groove formed in the sealing ring. By maintaining the insert in the groove until the sealing ring completely cools, the shrinkage of the sealing ring during its cooling effectively locks the insert in the groove.

대표청구항 ▼

A composite sealing ring subassembly for a plastic container adapted to be induction welded to said sealing ring subassembly, comprising a sealing ring made from a plastic material, said sealing ring having a central opening sized and shaped so as receive a closure for the container and a circular g

A composite sealing ring subassembly for a plastic container adapted to be induction welded to said sealing ring subassembly, comprising a sealing ring made from a plastic material, said sealing ring having a central opening sized and shaped so as receive a closure for the container and a circular groove sized and shaped so as to receive a rim of the container, and an insert made from an electrically conductive material, said insert being fixedly positioned in said groove in said sealing ring so as to be in juxtaposition with the rim of the container when said sealing ring subassembly is applied to the container, whereby said insert facilitates the induction welding of said sealing ring subassembly to the container by focusing the heat generated during the induction welding operation along the joint between the container and said sealing ring subassembly.