Method of sealing containers with laminated closures

Abstract

Abstract 1,011,800. Packages. PETROLITE CORPORATION. Aug. 22, 1962 [Aug. 23, 1961; April 16, 1962], No. 32271/62. Addition to 1,011,796. Drawings to Specification. Heading B8C. [Also in Division B5] A container comprises a container body and an unarticulated closure member at least one of these being of the laminated sheet material of the parent Specification, the closure member being sealed to the body by the exudation of the thermoplastic adhesive from one or more avenues of exit in edge regions of the sheet material. The container may be a circular tub (Figs. 5-10, not shown, or a single or double compartment tray (Figs. 2-9, not shown), the closure member being a flat sheet of the laminate which may be provided with a transparent window by removal of a portion of the outer plies, or by providing a tearaway portion in the outer ply, the window either being formed by the adhesive layer or by a further inner film layer of glassine, regenerated cellulose, cellulose acetate vinyl, or polystyrene. A multi-container strip may be filled with contents and covered with a strip of the laminated sheet which is then cut into individual closure members with a heated blade which simultaneously effects the sealing of the closure members to the containers.

Inventors

• 👤 George G Rumberger

Bibliographic Details