US3681819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for mechanically treating materials having a movable flexible retarder
Assignee: Joseph Bancroft and Sons Co
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Filing: 1971-04-19
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Granted: 1972-08-08
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Expires: 1991-04-19
Abstract
Abstract The flexible retarder is of a higher coefficient of friction than the primary surface and is mounted to be moved relative to the driving roll to avoid excessive wear. The retarder can be an endless belt, jacketed roller or an elongated strip and can be moved continuously or intermittently to expose fresh surfaces to the material being compacted.
Inventors
- 👤 Alexander L Trifunovic
- 👤 Charles R Kase Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:12
CPC Classifications
D; D06; D06C; D06C21/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
231 words
In a process for mechanically compacting a material of predetermined thickness including the steps of driving a length of the material via a driving means while confining the material to maintain the predetermined thickness and substantially undistorted state of the material, thereafter driving the length of material via said driving means into an accumulation cavity having an inlet of a predetermined clearance greater than the predetermined thickness of the material and an outlet of a predetermined clearance less than the predetermined clearance of the inlet, and frictionally engaging the material being advanced through the accumulation cavity on one side of the material with a surface of a flexible retarder throughout the accumuLation cavity to impose a friction force thereon in a direction substantially opposite to the direction in which the material is advanced for slowing the forward movement of the material while simultaneously supporting the material on the opposite side on the driving means throughout the accumulation cavity to increase the thickness of the material upon being advanced into the cavity and to accumulate and compress the material longitudinally within the cavity as the material is advanced through the cavity; the step of moving the flexible retarder relative to the driving means at a speed less than the speed of the driving means to present fresh surfaces of said flexible retarder to the conveyed web during mechanical compaction of the web.
Claim 2
Dependent Claim
231 words
In a process for mechanically compacting a material of predetermined thickness including the steps of driving a length of the material via a driving means while confining the material to maintain the predetermined thickness and substantially undistorted state of the material, thereafter driving the length of material via said driving means into an accumulation cavity having an inlet of a predetermined clearance greater than the predetermined thickness of the material and an outlet of a predetermined clearance less than the predetermined clearance of the inlet, and frictionally engaging the material being advanced through the accumulation cavity on one side of the material with a surface of a flexible retarder throughout the accumuLation cavity to impose a friction force thereon in a direction substantially opposite to the direction in which the material is advanced for slowing the forward movement of the material while simultaneously supporting the material on the opposite side on the driving means throughout the accumulation cavity to increase the thickness of the material upon being advanced into the cavity and to accumulate and compress the material longitudinally within the cavity as the material is advanced through the cavity; the step of moving the flexible retarder relative to the driving means at a speed less than the speed of the driving means to present fresh surfaces of said flexible retarder to the conveyed web during mechanical compaction of the web.
Claim 3
Dependent Claim
19 words
In a process as set forth in claim 1 wherein the flexible retarder is moved through an endless path.
Claim 4
Dependent Claim
28 words
In a process as set forth in claim 1 wherein the flexible retarder is moved at a speed ratio of about 50:1 with respect to said driving means.
Claim 5
Dependent Claim
22 words
In a process as set forth in claim 1 wherein the flexible retarder is moved continuously during movement of said driving means.
Claim 6
Dependent Claim
22 words
In a process as set forth in claim 1 wherein the flexible retarder is moved intermittently during movement of said driving means.
Claim 7
Dependent Claim
187 words
In a process of mechanically compacting a material of predetermined thickness which comprises driving the material into an accumulation cavity having an inlet of a predetermined clearance greater than the predetermined thickness of the material and an outlet of a predetermined clearance less than the predetermined clearance of the inlet, and while simultaneously supporting the material on one side on a moving member throughout the accumulation cavity, frictionally engaging the material on the opposite side with a surface of a flexible retarder throughout the accumulation cavity to impose a friction force thereon opposite to the direction in which the material is driven for slowing the forward movement of the material to increase the thickness of the material and to accumulate and longitudinally compress the material within the accumulation cavity as the material is driven through the cavity, and preventing the accumulated material from backing up out of the accumulation cavity; the step of moving the flexible retarder at a speed slower than the moving member during movement of the moving member to present fresh surfaces of the flexible retarder to the web during compaction of the web.
Claim 8
Dependent Claim
187 words
In a process of mechanically compacting a material of predetermined thickness which comprises driving the material into an accumulation cavity having an inlet of a predetermined clearance greater than the predetermined thickness of the material and an outlet of a predetermined clearance less than the predetermined clearance of the inlet, and while simultaneously supporting the material on one side on a moving member throughout the accumulation cavity, frictionally engaging the material on the opposite side with a surface of a flexible retarder throughout the accumulation cavity to impose a friction force thereon opposite to the direction in which the material is driven for slowing the forward movement of the material to increase the thickness of the material and to accumulate and longitudinally compress the material within the accumulation cavity as the material is driven through the cavity, and preventing the accumulated material from backing up out of the accumulation cavity; the step of moving the flexible retarder at a speed slower than the moving member during movement of the moving member to present fresh surfaces of the flexible retarder to the web during compaction of the web.
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |