US4324601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of glass container for thermoplastic closure
Assignee: OI Glass Inc
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Filing: 1981-02-10
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Granted: 1982-04-13
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Expires: 2001-02-10
Abstract
Abstract A method for preparing a glass container, and for sealing a glass mouth of a container and the seal are described. The sealing surface, or finish, of the container is subjected to a hot end treatment after forming and before annealing to enhance adhesion between the container finish and a thermoplastic membrane seal. The container is next annealed and after annealing is subjected to a cold end treatment in which the exterior container surface is coated with a material which enhances the lubricity and increases the abrasion and scratch resistance of the container. The container finish only is then subjected to a brief heat treatment sufficient to remove any lubricity enhancing material from the finish. A membrane comprising a thermoplastic film is pressed onto the container finish and heated causing glass-plastic adhesion and forming a closure.
Inventors
- 👤 Michael T. Dembicki
- 👤 William J. Poad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:01
CPC Classifications
C; C03; C03C; C03C23/00; B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/36; B29C65/3604; B29C65/3656; B29C65/3672; B29C65/3676; B29C65/368; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/114; B29C66/13; B29C66/131; B29C66/20; B29C66/24; B29C66/242; B29C66/2422; B29C66/24221; B29C66/50; B29C66/51; B29C66/53; B29C66/534; B29C66/5346; B29C66/53461; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B29C66/73; B29C66/739; B29C66/7392; B29C66/74; B29C66/746; B29C66/7465; B29C66/80; B29C66/81; B29C66/814; B29C66/8145; B29C66/81457; B29C66/818; B29C66/8181; B29C66/81811; B67; B67B; B67B5/00; B29C66/02; B29C66/026; B29K; B29K2705/00; B29K2705/02; B29L; B29L2031/00; B29L2031/56; B29L2031/565; B29L2031/712; B29L2031/7158; B65; B65D; B65D2251/00; B65D2251/0003; B65D2251/0006; B65D2251/0015; B65D2251/0068; B65D2251/0093; C03C2218/00; C03C2218/30; C03C2218/31; C03C2218/355; Y; Y10; Y10S; Y10S215/00; Y10S215/02; Y10T; Y10T428/00; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A method for preparing the finish of a glass container including side walls for use with a thermoplastic membrane closure comprising: subjecting the container finish while hot after forming and before annealing to a chemical treatment which renders the finish surface adherable to a thermoplastic membrane; annealing said container; subjecting the annealed container to a cold end treatment wherein the exterior container including the side walls is coated with a lubricity enhancing agent, and removing said lubricity enhancing agent from the finish surface by briefly exposing said surface to an intense heat source and heating it to below flame polishing temperature while avoiding the destruction by heat of the effect of the cold end treatment on the side walls.
Claim 2
Independent Claim
119 words
A method for preparing the finish of a glass container including side walls for use with a thermoplastic membrane closure comprising: subjecting the container finish while hot after forming and before annealing to a chemical treatment which renders the finish surface adherable to a thermoplastic membrane; annealing said container; subjecting the annealed container to a cold end treatment wherein the exterior container including the side walls is coated with a lubricity enhancing agent, and removing said lubricity enhancing agent from the finish surface by briefly exposing said surface to an intense heat source and heating it to below flame polishing temperature while avoiding the destruction by heat of the effect of the cold end treatment on the side walls.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the finish surface is briefly exposed to an intense heat source utilizing the rotation of the container beneath a gas burner for a time of less than about five seconds.
Claim 4
Dependent Claim
23 words
The method of claim 2 wherein said chemical treatment comprises contacting said container finish with a fluorine compound decomposable at the container temperature.
Claim 5
Dependent Claim
30 words
The method of claim 3 wherein said chemical treatment includes contacting said container finish with a metal oxide precursor which decomposes to form a metal oxide at the container temperature.
Claim 6
Dependent Claim
24 words
The method of claim 4 wherein said metal oxide precursor is selected from the group consisting of titanium chlorides, tin chlorides and mixtures thereof.
Claim 7
Dependent Claim
52 words
The method of claim 2 wherein said chemical treatment comprises contacting said container finish with a decomposable chemical agent selected from the group consisting of alkyl fluorides, ammonium fluorides, SnF 4 , BF 3 , AlF 3 , NH 4 SnF 3 , (CH 3 ) 2 SnF 2 and mixtures thereof.
Claim 8
Dependent Claim
27 words
The method of claim 2 wherein said container finish is at a temperature ranging from about 800 degrees to about 1200 degrees F. while undergoing chemical treatment.
Claim 9
Dependent Claim
12 words
The method of claim 7 wherein said glass is a soda-lime-silica glass.
Claim 10
Independent Claim
130 words
A method for sealing an opening in a glass container having side walls comprising: providing a rim-like sealing surface around said opening; treating said sealing surface at a high temperature with a chemical agent which renders said surface adherable to a thermoplastic membrane; coating the exterior surface of said container including said side walls with a lubricity enhancing agent; removing said lubricity enhancing agent from only said sealing surface by briefly exposing said surface to an intense heat source and heating it to below flame polishing temperature while avoiding destruction by heat of the effect of the cold end treatment on the side walls; pressing a membrane comprising a thermoplastic material against said sealing surface at a temperature above the softening point but below the melting point of said thermoplastic.
Claim 11
Independent Claim
130 words
A method for sealing an opening in a glass container having side walls comprising: providing a rim-like sealing surface around said opening; treating said sealing surface at a high temperature with a chemical agent which renders said surface adherable to a thermoplastic membrane; coating the exterior surface of said container including said side walls with a lubricity enhancing agent; removing said lubricity enhancing agent from only said sealing surface by briefly exposing said surface to an intense heat source and heating it to below flame polishing temperature while avoiding destruction by heat of the effect of the cold end treatment on the side walls; pressing a membrane comprising a thermoplastic material against said sealing surface at a temperature above the softening point but below the melting point of said thermoplastic.
Claim 12
Dependent Claim
44 words
The method of claim 9 wherein said chemical agent is selected from the group consisting of alkyl fluorides, ammonium fluorides, tin halides, titanium halides, BF 3 , AlF 3 , NH 4 SnF 3 , (CH 3 ) 2 SnF 2 and mixtures thereof.
Claim 13
Dependent Claim
28 words
The method of claim 9 wherein said container is annealed after treatment with said chemical agent but before coating the exterior surface thereof with a lubricity enhancing agent.
Claim 14
Dependent Claim
31 words
The method of claim 9 wherein the lubricity enhancing agent is removed from said sealing surface by rotating said surface beneath a gas burner for a time not exceeding five seconds.
Claim 15
Dependent Claim
21 words
The method of claim 9 wherein said membrane comprises a thermoplastic film adhesively joined on one face to a metal foil.
Claim 16
Dependent Claim
12 words
The method of claim 9 wherein said glass is a soda-lime-silica glass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |