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.
Parent Case Info
This application is a continuation of our prior copending application Ser. No. 514,194, filed Oct. 11, 1974 entitled "Container Closure With Liner And Methods Of Making Same", now abandoned, which in turn is a division of our then prior copending application Ser. No. 361,636, filed May 18, 1973 entitled "Container Closure With Liner And Methods of Making the Same", now U.S. Pat. No. 3,866,845, granted Feb. 18, 1975, all of which are assigned to the subject assignee.
US Referenced Citations (7)
Non-Patent Literature Citations (1)
Entry |
Winspear, Vanderbilt Rubber Handbook, Vanderbilt, N.Y., (1968), pp. 34, 35 & 174-185. |
Divisions (1)
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Number |
Date |
Country |
Parent |
361636 |
May 1973 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
514194 |
Oct 1974 |
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