US3673761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of applying pilfer-proof closures
Assignee: Novartis AG
•
Filing: 1971-02-04
•
Granted: 1972-07-04
•
Expires: 1991-02-04
Abstract
Abstract Method of applying a pilferproof closure which has a capping portion and has joined thereto along a failure line of reduced strength a security ring which has adjacent said failure line an annular portion from which extends a skirt portion having a thickness less than that of the annular portion. The closure member is formed from thermoplastic material and the skirt portion is warm rolled onto an undercut section of the neck of a container without heating the material at the failure line so as to distort it.
Inventors
- 👤 Wilfried Leitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:58
CPC Classifications
B; B29; B29C; B29C57/00; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29B13/025; B29C59/00; B29C59/007; B29C59/02; B29C59/04; B29C59/043; B29C65/00; B29C65/56; B29C65/567; B29C65/568; B29C66/00; B29C66/50; B29C66/51; B29C66/54; B29C66/542; B29C66/65; B29C66/80; B29C66/82; B29C66/822; B29C66/8221; B29C66/824; B29C66/8244; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B65; B65D; B65D41/00; B65D41/32; B65D41/34; B65D41/3461; B65D41/3466; B67; B67B; B67B3/00; B67B3/02; B67B3/026; B67B3/10; B67B3/18; B26; B26F; B26F2210/00; B26F2210/04; B29C35/00; B29C35/02; B29C35/04; B29C35/045; B29C2035/046; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/124; B29C66/1246; B29C66/12461; B29L; B29L2031/00; B29L2031/56; B29L2031/565; B65D2401/00; B65D2401/15; B65D2401/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
233 words
A process for capping the neck of a container having an undercut portion to provide a pilferproof seal therefor, comprising forming from plastic material a cap blank having a capping portion and having a security ring connected thereto along a failure line of reduced thickness, the security ring having adjacent said failure line an annular portion and extending therefrom a skirt portion having a uniform thickness around the entire periphery of at the most one-half that of the annular portion, placing said cap blank on the container, applying heat to plasticize the skirt portion by directing a jet of hot air at the skirt portion, monitoring continuously the plasticity of the skirt portion as said heat is being applied, applying a pressure to the outer surface of said thinner skirt portion by engaging the surface of a roller with the periphery of the skirt portion and moving the roller arounD the security ring in order to roll it under said undercut portion when a predetermined degree of plasticity is detected, and controlling the application of heat so that there is no substantial further increase in temperature of the skirt portion, whereby only the skirt portion is plasticized and the temperature of the annular portion and the material at the failure line of the cap blank is prevented from rising to the plasticizing temperature and the material at the failure line is kept undistorted.
Claim 2
Dependent Claim
233 words
A process for capping the neck of a container having an undercut portion to provide a pilferproof seal therefor, comprising forming from plastic material a cap blank having a capping portion and having a security ring connected thereto along a failure line of reduced thickness, the security ring having adjacent said failure line an annular portion and extending therefrom a skirt portion having a uniform thickness around the entire periphery of at the most one-half that of the annular portion, placing said cap blank on the container, applying heat to plasticize the skirt portion by directing a jet of hot air at the skirt portion, monitoring continuously the plasticity of the skirt portion as said heat is being applied, applying a pressure to the outer surface of said thinner skirt portion by engaging the surface of a roller with the periphery of the skirt portion and moving the roller arounD the security ring in order to roll it under said undercut portion when a predetermined degree of plasticity is detected, and controlling the application of heat so that there is no substantial further increase in temperature of the skirt portion, whereby only the skirt portion is plasticized and the temperature of the annular portion and the material at the failure line of the cap blank is prevented from rising to the plasticizing temperature and the material at the failure line is kept undistorted.
Claim 3
Dependent Claim
54 words
A process as claimed in claim 1 in which said monitoring step is carried out by placing a monitoring means against said skirt which is responsive to the plasticity of the skirt, and operating said pressure applying roller only after said monitoring means senses that the material of the skirt portion has been plasticized.
Claim 4
Dependent Claim
59 words
A process as claimed in claim 1 in which said monitoring step is carried out by engaging the roller with the periphery of the skirt portion and continuously urging said roller toward said skirt portion, whereby when the perdetermined degree of plasticity has been attained, the pressure on the roller will roll the skirt portion under the undercut portion.
Claim 5
Dependent Claim
286 words
A process for capping the neck of a container having an undercut portion to provide a pilferproof seal therefor, comprising forming from plastic material a cap blank having a capping portion and having a security ring thereon of substantially the same thickness as that of said capping portion, the security ring being comprised of an annular portion and extending therefrom a skirt portion having a uniform thickness around the entire periphery of at the most one-half that of the annular portion, placing said cap blank on the container, applying heat to plasticize the skirt portion by directing a jet of hot air at the skirt portion, monitoring continuously the plasticity of the skirt portion as said heat is being applied, applying a pressure to the outer surface of said thinner skirt portion by engaging the surface of a roller with the periphery of the skirt portion and moving the roller around the security ring in order to roll it under said undercut portion when a predetermined degree of plasticity is detected, controlling the application of heat so that there is no substantial further increase in temperature of the skirt portion, and at a time no later than the application of rolling pressure, forming a failure line of reduced thickness around said cap blank by rolling a notched cutting roller around the cap blank to cut slits in said blank to leave a plurality of webs joining the capping portion to the security ring, whereby only the skirt portion is plasticized and the temperature of the annular portion and the material at the failure line of the cap blank is prevented from rising to the plasticizing temperature and the material at the failure line is kept undistorted.
Claim 6
Dependent Claim
286 words
A process for capping the neck of a container having an undercut portion to provide a pilferproof seal therefor, comprising forming from plastic material a cap blank having a capping portion and having a security ring thereon of substantially the same thickness as that of said capping portion, the security ring being comprised of an annular portion and extending therefrom a skirt portion having a uniform thickness around the entire periphery of at the most one-half that of the annular portion, placing said cap blank on the container, applying heat to plasticize the skirt portion by directing a jet of hot air at the skirt portion, monitoring continuously the plasticity of the skirt portion as said heat is being applied, applying a pressure to the outer surface of said thinner skirt portion by engaging the surface of a roller with the periphery of the skirt portion and moving the roller around the security ring in order to roll it under said undercut portion when a predetermined degree of plasticity is detected, controlling the application of heat so that there is no substantial further increase in temperature of the skirt portion, and at a time no later than the application of rolling pressure, forming a failure line of reduced thickness around said cap blank by rolling a notched cutting roller around the cap blank to cut slits in said blank to leave a plurality of webs joining the capping portion to the security ring, whereby only the skirt portion is plasticized and the temperature of the annular portion and the material at the failure line of the cap blank is prevented from rising to the plasticizing temperature and the material at the failure line is kept undistorted.
References Cited (Backward Citations)
US2669740A
Cited
US3415403A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |