| 摘要 |
<p>A container with a heat-securable tamper-indicating wax-coated closure sheet is disclosed herein, along with the methods and apparatus for making same. The container comprises a base with a sidewall extending upwardly from the periphery of the base and defining a substantially circular open top, or mouth. A square-shaped sheet of flexible closure material is disposed over the rim of the mouth of the container and is engaged between the container rim and a superposed container lid. Each of the four corners of the sheet extend beyond the periphery of the lid to form tabs which project downwardly alongside the container sidewall and are heat-sealingly secured thereto. The method and apparatus for securing the tabs to the container includes engaging the upper portion of the container with a plunger with a depending cylindrical flange for bearing against the projecting tabs of the sheet to urge them downwardly alongside the container sidewall at a temperature to heat-set them in that position. The container is moved on a conveyor between, and in contact with, a heated rail on one side and a cool sealing belt on the other side. The sealing belt engages the container to rotate the container about a vertical axis and roll the container along the heated rail to bring each tab sequentially into contact with the rail and the belt wherein the wax coating on the tabs is melted by the heated rail and subsequently pressed against the container sidewall by the belt to secure the corners of the sheet to the sidewall of the container.</p> |
