Patent US4348164A successfully refreshed from Google Patents.
US4348164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous production of a slab of polyurethane foam
Assignee: Toyo Tire Corp
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Filing: 1980-12-04
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Granted: 1982-09-07
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Expires: 2000-12-04
Abstract
Abstract A continuous production process for making a slab of polyurethane foam comprises preparing a foamable polyurethane composition, continuously feeding the composition to a horizontally moving trough to form a foaming mass on the trough, continuously pressing the top surface of the foaming mass with a pressure means over a zone including a zone extending from the foaming completion point to a point just prior to the completion of curing so as to make flat the top surface of the foaming mass, and horizontally moving the pressure means in synchronism with and in the same direction as the trough. Preferably, the composition is fed to the trough at such a rate as to produce a slab about 40 mm to 250 mm thick. The process can produce at a low cost polyurethane foam slabs which have no cavities and no cracks and which therefore have a uniform density or porosity.
Inventors
- 👤 Osamu Fujii
- 👤 Toshio Kishimoto
- 👤 Hisao Kosuge
- 👤 Ryoji Nagamine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:27
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/467; B29C44/20; B29C44/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
An apparatus for continuous production of a slab of polyurethane foam having a fabric sheet laminated on at least one of its surfaces, comprising: (A) a horizontally moving trough which comprises a bottom plate or surface portion including first and second endless belt conveyors arranged one after the other in a horizontal direction and a pair of sidewalls each including a horizontally movable vertical sheet; (B) feeding means for feeding a foamable polyurethane composition to the moving trough to form a foaming mass on the moving trough; (C) pressure means for lightly pressing the top surface of the foaming mass over a zone including a zone extending from the foaming completion point to a point just prior to the completion of curing; and (D) sheet feeding means for continuously feeding a fabric sheet between the under surface of the foaming mass and the second endless belt conveyor through the space between the first and second endless conveyors while said foaming mass remains adhesive though completely foamed, so as to bond the fabric sheet to the under surface of said foaming mass substantially without impregnating the fabric sheet with the polyurethane composition.
Claim 2
Independent Claim
191 words
An apparatus for continuous production of a slab of polyurethane foam having a fabric sheet laminated on at least one of its surfaces, comprising: (A) a horizontally moving trough which comprises a bottom plate or surface portion including first and second endless belt conveyors arranged one after the other in a horizontal direction and a pair of sidewalls each including a horizontally movable vertical sheet; (B) feeding means for feeding a foamable polyurethane composition to the moving trough to form a foaming mass on the moving trough; (C) pressure means for lightly pressing the top surface of the foaming mass over a zone including a zone extending from the foaming completion point to a point just prior to the completion of curing; and (D) sheet feeding means for continuously feeding a fabric sheet between the under surface of the foaming mass and the second endless belt conveyor through the space between the first and second endless conveyors while said foaming mass remains adhesive though completely foamed, so as to bond the fabric sheet to the under surface of said foaming mass substantially without impregnating the fabric sheet with the polyurethane composition.
Claim 3
Dependent Claim
46 words
An apparatus according to claim 1, further comprising means for continuously feeding a releasable sheet between said second endless belt conveyor and said fabric sheet fed by said sheet feeding means and means for stripping off the releasable sheet after said foaming mass has been fabricated.
Claim 4
Dependent Claim
66 words
An apparatus according to claim 1, further comprising a further sheet feeding means for continuously feeding a fabric sheet between said pressure means and the top surface of said foaming mass while said foaming mass remains adhesive though completely foamed, so as to bond the fabric sheet to the top surface of said foaming mass substantially without impregnating said top fabric sheet with the polyurethane composition.
Claim 5
Dependent Claim
27 words
An apparatus according to claim 1 or 3, further comprising heating means for heating said foaming mass which is being carried on said second endless belt conveyor.
Claim 6
Dependent Claim
53 words
An apparatus according to claim 4, wherein said heating means comprises a heating furnace, the rear or downstream portion of said second endless belt conveyor, as seen in the direction of conveying, being placed in said heating furnace for heating said foaming mass which is being carried on said second endless belt conveyor.
References Cited (Backward Citations)
US3435102A
Cited
US3354503A
Cited
US3734668A
Cited
US3764247A
Cited
US4043719A
Cited
US4252515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |