US3871808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing substantially uniform calendered material
Assignee: Union Carbide Corp
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Filing: 1972-01-13
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Granted: 1975-03-18
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Expires: 1992-01-13
Abstract
Abstract Apparatus is disclosed for the calendering of thermoplastic material comprising a series of at least three coplanar cooperating rolls, at least one of the rolls forming the gauging nip being crowned, the penultimate roll of said series being substantially more flexible than the other of said rolls, and means for adjusting the separation betwen said rolls, whereby the roll clearance across said gauging nip is continuously maintainable for a given roll separating force by deflection of said more flexible penultimate roll.
Inventors
- 👤 Fred H Ancker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:08
CPC Classifications
D; D21; D21G; D21G1/00; D21G1/002; B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/68; B29C; B29C43/00; B29C43/22; B29C43/24; Y; Y10; Y10S; Y10S425/00; Y10S425/235
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
In calendering apparatus for the production of thermoplastic film having at least three coplanar, cooperating calender rolls suspended in bearing mountings in opposed side frames, the improvement which comprises a crowned penultimate roll interposed between cylindrical ultimate and antepenultimate rolls to form the three rolls of said coplanar system, said penultimate roll being crowned to provide an equidistant gauging nip when said penultimate roll is undeflected and said ultimate roll is at its maximum deflection and having a flexural ridigity ratio in respect to said ultimate roll of between about 0.03 and 0.75, means for adjusting the separation of said rolls, bearings for said penultimate roll comprises of a main normal clearance bearing disposed about each neck of said roll and two auxiliary adjustable bearings proximate to and disposed about each side of each of said main bearings providing pullback means adapted to force said roll necks into a stable position against each of said main bearings; and bearing housings for said penultimate roll being attached to the opposed side frames through self-aligning spring mountings.
Claim 2
Dependent Claim
175 words
In calendering apparatus for the production of thermoplastic film having at least three coplanar, cooperating calender rolls suspended in bearing mountings in opposed side frames, the improvement which comprises a crowned penultimate roll interposed between cylindrical ultimate and antepenultimate rolls to form the three rolls of said coplanar system, said penultimate roll being crowned to provide an equidistant gauging nip when said penultimate roll is undeflected and said ultimate roll is at its maximum deflection and having a flexural ridigity ratio in respect to said ultimate roll of between about 0.03 and 0.75, means for adjusting the separation of said rolls, bearings for said penultimate roll comprises of a main normal clearance bearing disposed about each neck of said roll and two auxiliary adjustable bearings proximate to and disposed about each side of each of said main bearings providing pullback means adapted to force said roll necks into a stable position against each of said main bearings; and bearing housings for said penultimate roll being attached to the opposed side frames through self-aligning spring mountings.
Claim 3
Dependent Claim
172 words
In calendering apparatus for the production of thermoplastic film having at least three coplanar, cooperating calender rolls suspended in bearing mountings in opposed side frames, the improvement which comprises a crowned penultimate roll interposed between cylindrical ultimate and antepenultimate rolls to form the three rolls of said coplanar system, said penultimate roll being crowned to provide an equidistant gauging nip when said penultimate roll is undeflected and said ultimate roll is at its maximum deflection and having a flexural rigidity ratio in respect to said ultimate roll of between about 0.03 and 0.75, means for adjusting the separation of said rolls, bearings for said penultimate roll comprised of a pre-loaded roller bearing interposed between inner and outer bearing races mounted on each neck of said roll with a zero clearance fit, said bearing adapted to receive and circulate therein a heat transfer medium thereby maintaining the roll necks and said bearings at equal temperatures; and bearing housings for Said penultimate roll being attached to the opposed side frames through self-aligning spring mountings.
Claim 4
Dependent Claim
172 words
In calendering apparatus for the production of thermoplastic film having at least three coplanar, cooperating calender rolls suspended in bearing mountings in opposed side frames, the improvement which comprises a crowned penultimate roll interposed between cylindrical ultimate and antepenultimate rolls to form the three rolls of said coplanar system, said penultimate roll being crowned to provide an equidistant gauging nip when said penultimate roll is undeflected and said ultimate roll is at its maximum deflection and having a flexural rigidity ratio in respect to said ultimate roll of between about 0.03 and 0.75, means for adjusting the separation of said rolls, bearings for said penultimate roll comprised of a pre-loaded roller bearing interposed between inner and outer bearing races mounted on each neck of said roll with a zero clearance fit, said bearing adapted to receive and circulate therein a heat transfer medium thereby maintaining the roll necks and said bearings at equal temperatures; and bearing housings for Said penultimate roll being attached to the opposed side frames through self-aligning spring mountings.
References Cited (Backward Citations)
US2815531A
Cited
US2970339A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |