Molding
AssigneeMaxcap, Inc.
InventorRobert L. Nolan
Life of this patent
Estimating the term…
Abstract
For the molding of bottle caps having irregular lower boundaries, such as caps having depending tabs, the conventional mold has a core and a surrounding sleeve in which the core slides. This is modified by using a split sleeve which is maintained in close contact with the core during molding, but whose elements are freed to move outwardly away from the core when the mold begins to open. This solves the prior art problem of the galling of the contacting surfaces of sleeve and core.
Claims10
A mold for forming a plastic cap having a top and side wall comprising a core against which the inside of said cap is formed, mold means against which the outside of the top of said cap is formed and a sleeve surrounding said core and against which the outside of the side wall of the cap is formed said sleeve being in close contact with said core at the boundary of the zone where the bottom of said cap side wall is formed, said contact being sufficiently close to substantially prevent flow of plastic between said core and said sleeve at said boundary, said mold having means for effecting axial movement of said core relative to said sleeve on completion of the molding of a cap so as to remove the resulting molded cap from within said sleeve, the improvement wherein said sleeve comprises at least two separable portions each in close contact with said core along said boundary, means for maintaining said portions in said close contact with each other during the molding of said cap, the construction and arrangement being such that said portions are permitted to move away from each other and from said core at the beginning of said axial movement of said core.
Dependencies are inferred from the claim text.