US3754117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for corona treatment of a layer of plastic material
Assignee: Bpifrance Financement SA
•
Filing: 1971-12-08
•
Granted: 1973-08-21
•
Expires: 1991-12-08
Abstract
Abstract A corona effect is produced across the layer of material to be treated by means of an intense electric field set up between two electrically insulated electrodes separated by a very narrow airgap consisting of a slit which is formed at the extremity of an extruder head and through which the material is delivered continuously at its maximum temperature.
Inventors
- 👤 J Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:25
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B26F1/28; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/30; B29C48/305; B29C48/07; B29C48/08; Y; Y10; Y10S; Y10S264/00; Y10S264/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A device for treating a layer of plastic material by production of a corona effect by means of an intense electric field, said material bEing continuously extruded at its maximum temperature fron a narrow slit formed at the extremity of the head of an extruder, said slit being defined by two parallel opposed metallic components, comprising a first electrode of one of the two components, an element of electrically insulating material mounted in an open channel at the extremity of the second component, a second metallic plate electrode mounted on said element at the outlet of the extruder head, a voltage source connected to said plate electrode, said element being securely maintained in position within the channel of the second component by a metallic abutment member secured to said component and applied against said element out of contact with said small metallic plate and an electrically insulating guard mask mounted in front of and surrounding said metallic abutment member preventing an electric arc between said metallic plate and the second component and means for providing a gaseous atmosphere about said electrodes.
Claim 2
Independent Claim
181 words
A device for treating a layer of plastic material by production of a corona effect by means of an intense electric field, said material bEing continuously extruded at its maximum temperature fron a narrow slit formed at the extremity of the head of an extruder, said slit being defined by two parallel opposed metallic components, comprising a first electrode of one of the two components, an element of electrically insulating material mounted in an open channel at the extremity of the second component, a second metallic plate electrode mounted on said element at the outlet of the extruder head, a voltage source connected to said plate electrode, said element being securely maintained in position within the channel of the second component by a metallic abutment member secured to said component and applied against said element out of contact with said small metallic plate and an electrically insulating guard mask mounted in front of and surrounding said metallic abutment member preventing an electric arc between said metallic plate and the second component and means for providing a gaseous atmosphere about said electrodes.
Claim 3
Dependent Claim
28 words
A device in accordance with claim 1, wherein the small metallic plate is rigidly fixed to the insulating element by bonding with an adhesive having a silicone base.
Claim 4
Dependent Claim
47 words
A device in accordance with claim 1, wherein the space which is formed by the mask, the small metallic plate and the insulating element which is carried by the second component is filled with an electrically insulating packing which is constituted in particular by a polymerizable silicone.
Claim 5
Dependent Claim
27 words
A device in accordance with claim 1, wherein the gaseous atmosphere is constituted by nitrogen charged with vapors of styrene, phenyl-acetylene, water or any other suitable substance.
Claim 6
Dependent Claim
21 words
A device in accordance with claim 1, said insulating element being selected from the group consisting of sintered alumina and aluminatitania.
References Cited (Backward Citations)
US2922883A
Cited
US3351740A
Cited
US3405052A
Cited
US3385966A
Cited
US3483374A
Cited
US3632299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |