Patent US3711235A successfully refreshed from Google Patents.
US3711235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die deckle means
Assignee: Egan Machinery Co
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Filing: 1971-11-10
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Granted: 1973-01-16
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Expires: 1991-11-10
Abstract
Abstract An extrusion die having a discharge orifice in the form of a relatively long narrow slot and adapted to extrude a film or sheet of a flowable plastic material. The die is equipped with known external deckle means adjustably positioned along the outer end of the discharge orifice and improved internal deckle means adjustably positioned along the inner end of the discharge orifice. The external and internal deckle means are adjustable in unison or separately, as desired, along corresponding ends of the discharge orifice. The die and the external and internal deckle means are so constructed and arranged as to effectively regulate and control both the width and the thickness of a plastic film or sheet that is extruded from the die.
Inventors
- 👤 W Bunte
- 👤 Gasperis L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/03; B29C48/07; B29C48/08; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/92609; B29C2948/92628; B29C2948/92647; B29C2948/92819; B29C2948/92857; B29C2948/92904
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
215 words
In combination with a die for extruding a film or sheet of flowable plastic material and having a discharge orifice in the form of a relatively long narrow slot, said orifice having an inlet coextensive with the length of the slot and communicating with a manifold for containing a supply of the plastic material in a molten state and having an outlet coextensive with the length of the slot and communicating with the atmosphere, a. external deckle means carried by the die and sealing an end portion of the orifice outlet, and b. internal deckle means extending into the die and sealing an end portion of the orifice inlet corresponding to said end portion of the orifice outlet, said internal deckle means comprising a rod including rectilinear first and second parts within the die, said first part being circular in transverse cross section, said second part being an extension of the first part and comprising a first portion constituting an end of the rod and a second portion intermediate the first portion and the first part, said first portion being circular in transverse cross section and having a diameter substantially equal to that of the first part, said second portion comprising a frustoconical first section which tapers inwardly in the direction of the first portion.
Claim 2
Dependent Claim
215 words
In combination with a die for extruding a film or sheet of flowable plastic material and having a discharge orifice in the form of a relatively long narrow slot, said orifice having an inlet coextensive with the length of the slot and communicating with a manifold for containing a supply of the plastic material in a molten state and having an outlet coextensive with the length of the slot and communicating with the atmosphere, a. external deckle means carried by the die and sealing an end portion of the orifice outlet, and b. internal deckle means extending into the die and sealing an end portion of the orifice inlet corresponding to said end portion of the orifice outlet, said internal deckle means comprising a rod including rectilinear first and second parts within the die, said first part being circular in transverse cross section, said second part being an extension of the first part and comprising a first portion constituting an end of the rod and a second portion intermediate the first portion and the first part, said first portion being circular in transverse cross section and having a diameter substantially equal to that of the first part, said second portion comprising a frustoconical first section which tapers inwardly in the direction of the first portion.
Claim 3
Dependent Claim
87 words
The combination according to claim 1 wherein the external deckle means comprises a deckle bar which bears against the die and bridges said end portion of the orifice outlet and which terminates in an inner end, said first portion of the rod terminating in a free end which is located in the die at a point beyond the inner end of the deckle bar nd which is offset therefrom a distance within the range of from about 0.25 to about 4 inches as measured along the rod.
Claim 4
Dependent Claim
91 words
The combination according to claim 2 wherein the diameters of the first part and the first portion are substantially the same and are within the range of from 0.075 to 0.250 inches, the length of the first portion is within the range of from 0.125 to 1 inch, the clearance between the part of smallest diameter of the second portion and the first portion is within the range of from 0.0005 to 0.050 inches, and the length of the second portion is within the range of from 1 to 3 inches.
Claim 5
Dependent Claim
43 words
The combination according to claim 3 wherein the second portion also comprises a right circular cylindrical second section disposed between the first section and the first portion, the length of the second section being within the range of from 0.25 to 1.50 inches.
Claim 6
Dependent Claim
80 words
The combination according to claim 2 wherein the diameters of the first part and the first portion are approximately 0.1 inch, the length of the first portion is within the range of from 0.125 to 0.50 inches, the clearance between the part of smallest diameter of the second portion and the first portion is within the range of from 0.002 to 0.020 inches, and the length of the second portion is within the range of from 1.25 to 2.50 inches.
Claim 7
Dependent Claim
43 words
The combination according to claim 5 wherein the second portion also comprises a right circular cylindrical second section disposed between the first section and the first portion, the length of the second section being within the range of from 0.50 to 1 inch.
Claim 8
Dependent Claim
34 words
The combination accorDing to claim 1 including a. coupling means releasably connecting the internal deckle means to the external deckle means to permit adjustment of both deckle means relative to the die in unison.
Claim 9
Dependent Claim
87 words
The combination according to claim 5 wherein the external deckle means comprises a deckle bar which bears against the die and bridges said end portion of the orifice outlet and which terminates in an inner end, said first portion of the rod terminating in a free end which is located in the die at a point beyond the inner end of the deckle bar and which is offset therefrom a distance within the range of from about 0.25 to about 4 inches as measured along the rod.
Claim 10
Dependent Claim
91 words
The combination according to claim 6 wherein the diameters of the first part and the first portion are substantially the same and are within the range of from 0.075 to 0.250 inches, the length of the first portion is within the range of from 0.125 to 1 inch, the clearance between the part of smallest diameter of the second portion and the first portion is within the range of from 0.0005 to 0.050 inches, and the length of the second portion is within the range of from 1 to 3 inches.
Claim 11
Dependent Claim
43 words
The combination according to claim 9 wherein the second portion also comprises a right circular cylindrical second section disposed between the first section and the first portion, the length of the second section being within the range of from 0.25 to 1.50 inches.
Claim 12
Dependent Claim
80 words
The combination according to claim 6 wherein the diameters of the first part and the first portion are approximately 0.1 inch, the length of the first portion is within the range of from 0.125 to 0.50 inches, the clearance between the part of smallest diameter of the second portion and the first portion is within the range of from 0.002 to 0.020 inches, and the length of the second portion is within the range of from 1.25 to 2.50 inches.
Claim 13
Dependent Claim
43 words
The combination according to claim 11 wherein the second portion also comprises a right circular cylindrical second section disposed between the first section and the first portion, the length of the second section being within the range of from 0.50 to 1 inch.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |