Method for making a container closure with liner

• US 4,361,457 A
• Filed: 06/09/1976
• Issued: 11/30/1982
• Est. Priority Date: 05/18/1973
• Status: Expired due to Term

• Current Assignee: The KLM Corporation (Kaye Corp.)
• Original Assignee: The KLM Corporation (Kaye Corp.)
• Inventors: Keeler, Frederick D., Ellis, Carleton Jr.
• Primary Examiner(s): Hoag, Willard E.
• Application Number:
  US05/694,508
• Time in Patent Office: 2,365 Days
• Field of Search: 264/90, 264/92, 264/321, 264/318, 264/322, 264/83, 264/22, 264/510, 264/320, 264/232, 315/341, 315/347, 315/348, 315/22, 315/82, 315/83, 156/224, 156/242, 156/245, 156/497
• US Class Current: 156/224
• CPC Class Codes: B29C 51/14 using multilayered preforms or sheets
• CPC Class Codes: B65D 41/045 Discs B65D41/0457 takes precedence
• CPC Class Codes: B65D 41/0457 the sealing element covering or co-operating with the screw-thread or the like of a container neck
• CPC Class Codes: Y10T 156/1048 to form dished or receptacle-like product

Abstract

A container closure which is thermoformed from a sheet of two different materials which are bonded together, the material forming the inside of the closure being relatively soft to serve as a liner.

Claims

1. The method of producing a closure for sealing the threaded neck of a container comprising the steps of

providing a base sheet of thermoformed plastic material of substantially uniform thickness;

providing a sheet of compressible thermoplastic rubber thermoformable liner material adjacent said base sheet, said sheet of liner material also being of substantially uniform thickness throughout and being more resilient than the plastic base material,

subjecting the liner material to ultraviolet light to reduce its coefficient of friction,

bonding the sheet of liner material to the sheet of base material, and

thermoforming said base sheet and said sheet of liner material as a unit to produce a closure having a top wall and a skirt wall with threaded fastening means thereon depending therefrom in which the plastic material of the base sheet is on the outside of the closure and in which the liner material is permanently bonded to the base sheet over the entire inside area of the closure.

2. The method of producing a closure for sealing the threaded neck of a container comprising the steps of

providing a base sheet of thermoformed plastic material of substantially uniform thickness;

providing a sheet of compressible thermoplastic rubber material thermoformable liner material adjacent said base sheet, said sheet of liner material also being of substantially uniform thickness throughout and being more resilient than the plastic base material,

subjecting the liner material to ozone to reduce its coefficient of friction,

bonding the sheet of liner material to the sheet of base material, and

thermoforming said base sheet and said sheet of liner material as a unit to produce a closure having a top wall and a skirt wall with threaded fastening means thereon depending therefrom in which the plastic material of the base sheet is on the outside of the closure and in which the liner material is permanently bonded to the base sheet over the entire inside area of the closure.