US3809512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the continuous production of strands of polymeric foam
Assignee: Unifoam Ag
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Filing: 1972-07-26
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Granted: 1974-05-07
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Expires: 1992-07-26
Abstract
Abstract Apparatus for the continuous production of strands of polymeric foam. Strands of foam are produced by depositing liquid foam reactants onto an open-topped continuous trough conveyor and a flat top surface to the foam is achieved by introducing guide sheets between the sides of the trough conveyor and the foam and raising and controlling the guide sheets so that they are always in accurate registration with the rising foam. The guide sheets are introduced downwardly into the trough conveyor and then passed around respective straight fold bars the attitudes of which are adjustable. The guide sheets thereafter follow upwardly inclined paths, corresponding to the rising level of the foam, and are advanced by pull rolls which are also adjustable in attitude. The positions along the trough conveyor of the fold bars and the pull rolls can be adjusted. Preferably, the guide sheets are sheets of thin plastics material, e.g. polyethylene.
Inventors
- 👤 J Blackwell
- 👤 D Killen
- 👤 V Hodgson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:47
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/32; B29C44/321; B29C44/3215; B32; B32B; B32B27/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
An improvement as claimed in claim 1, wherein said supporting means comprises means for adjusting the attitude of said fold bar, whereby the upwardly inclined path of the guide sheet can be maintained in correspondence with the rising level of the foam.
Claim 2
Dependent Claim
59 words
An improvement as claimed in claim 2, wherein said advancing means comprises pull rolls engageable with the upper edge of the guide sheet, the pull rolls being positioned adjacent the region where foaming is completed, and means for adjusting the attitude of said pull rolls relative to the guide sheet in dependence upon the attitude of said fold bar.
Claim 3
Dependent Claim
70 words
An improvement as claimed in claim 1, wherein said advancing means comprises pull rolls engageable with the upper edge of the guide sheet, the pull rolls being positioned adjacent the region where foaming is completed, and independent means for adjusting the location along the trough conveyor of said fold bar and said pull rolls so as to compensate for any alteration of the regions where foaming is initiated and completed.
Claim 4
Dependent Claim
89 words
An imProvement as claimed in claim 1, comprising idler rolls embracing the guide sheet between said supply means and said fold bar, said idler rolls having rotational axes set at an acute angle to the direction of travel of the guide sheet, means for sensing deviation of the guide sheet from a predetermined positional relationship with said fold bar, and means for applying pressure between said idler rolls onto the guide sheet in response to such sensed deviation so as to return the guide sheet to said positional relationship.
Claim 5
Dependent Claim
90 words
An improvement as claimed in claim 1, wherein said advancing means comprises pull rolls engageable with the upper edge of the guide sheet, the pull rolls being positioned adjacent the region where foaming is completed, means for sensing deviation of said upper edge from a predetermined positional relationship with said pull rolls, and means for adjusting the angular relationship between said guide sheet edge and the rotational axes of said pull rolls in response to such sensed deviation so as to return the guide sheet edge to said positional relationship.
Claim 6
Dependent Claim
134 words
Apparatus for the continuous production of polymeric foam strands, comprising an open-topped trough conveyor, nozzle means located near the upstream end of said conveyor for depositing a mixture of liquid foam reactants in said conveyor, a fold bar disposed within the conveyor at each side of the conveyor downstream from said nozzle means, a pull roll assembly adjustably mounted at each side of the conveyor downstream from said fold bar, a supply roll of guide sheet material mounted above each said fold bar; and means for adjustably supporting each fold bar within said conveyor such that each guide sheet extends from its supply roll downwardly into the trough conveyor and around said fold bar and then along an upwardly inclined path with an upper edge engaged between the rolls of said pull roll assembly.
Claim 7
Dependent Claim
18 words
Apparatus as claimed in claim 7, wherein each said guide sheet is a sheet of thin plastic material.
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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |