초록 ▼

An apparatus and method for forming a lid having an annular mounting portion, an annular trough region positioned radially inward of the annular mounting portion, an annular side wall extending upwardly from an inner periphery of the annular trough region to an annular ridge adjacent said annular si

An apparatus and method for forming a lid having an annular mounting portion, an annular trough region positioned radially inward of the annular mounting portion, an annular side wall extending upwardly from an inner periphery of the annular trough region to an annular ridge adjacent said annular side wall, and a crown region is set forth. The apparatus includes a forming die having an upper surface of a configuration conforming to the configuration of the lid, a forming ring for aiding in the forming of the lid, a positioning device for positioning the thermoformable sheet material adjacent the upper surface of the forming die between the forming die and the forming ring and a drive mechanism for lowering the forming ring into contact with the sheet material. The method includes contacting that portion of the sheet material which forms a lowermost region of the lid with the forming ring so as to carry the material down into the lowermost region of the forming die.

대표청구항 ▼

[ We claim:] [1.] A lid having a substantially uniform thickness formed of a thermoformable sheet material comprising:an annular mounting portion for sealingly engaging the drinking cup;an annular trough region positioned radially inwardly of the annular mounting portion, said annular trough region

[ We claim:] [1.] A lid having a substantially uniform thickness formed of a thermoformable sheet material comprising:an annular mounting portion for sealingly engaging the drinking cup;an annular trough region positioned radially inwardly of the annular mounting portion, said annular trough region having a thickness;an annular side wall extending upwardly from an inner periphery of said annular trough region to an annular ridge adjacent said annular side wall, said annular side wall having a thickness substantially equal to said thickness of said annular trough region;a drinking opening formed in said annular ridge; anda crown region having a periphery adjacent said annular ridge.