Patent US3324801A successfully refreshed from Google Patents.
Patent US3879508A successfully refreshed from Google Patents.
US3879508A
Expired / Lapsed
US
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Process for producing a corrugated foamed thermoplastic resin sheet
Assignee: Monsanto Chemicals Ltd
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Filing: 1973-04-26
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Granted: 1975-04-22
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Expires: 1993-04-26
Abstract
Abstract This application describes corrugated foam thermoplastic materials in which each corrugation is itself corrugated. In effect, the thermoplastic materials are corrugated in two directions and generally have a waffle-like appearance. Also described is a process for producing the double corrugated materials and suitable apparatus therefor. The corrugated materials find many uses, for instance, as a carpet underlay.
Inventors
- 👤 John Harold Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:54
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/13; B29C48/25; B29C48/30; B29C48/305; C; C08; C08J; C08J9/00; C08J9/04; B29C48/001; B29L; B29L2016/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
76 words
IN A PROCESS FOR PROCESSING A CORRUGATED FOAMED THEREMOPLASTIC RESIN SHEET, WHICH INCLUDES EXTRUDING A FOAMABLE THERMOPLASTIC RESIN COMPOSITION THROUGH A DIE HAVING A SLIT DIE ORIFICE TO FORM A FOAMING RESIN SHEET, THE IMPROVEMENT WHICH COMPRISES: 1 FEEDING SAID FOAMING RESIN SHEET INTO A NIP OF A PAIR OF DRIVEN ROLLERS, SAID ROLLERS BEING AN INTEGRAL PART OF SAID DIE AND BEING STUDDED WITH A SERIES OF PROJECTING, INTERMESHING TEETH ARRANGED IN A STAGGERED PATTERN,
Claim 2
Dependent Claim
76 words
IN A PROCESS FOR PROCESSING A CORRUGATED FOAMED THEREMOPLASTIC RESIN SHEET, WHICH INCLUDES EXTRUDING A FOAMABLE THERMOPLASTIC RESIN COMPOSITION THROUGH A DIE HAVING A SLIT DIE ORIFICE TO FORM A FOAMING RESIN SHEET, THE IMPROVEMENT WHICH COMPRISES: 1 FEEDING SAID FOAMING RESIN SHEET INTO A NIP OF A PAIR OF DRIVEN ROLLERS, SAID ROLLERS BEING AN INTEGRAL PART OF SAID DIE AND BEING STUDDED WITH A SERIES OF PROJECTING, INTERMESHING TEETH ARRANGED IN A STAGGERED PATTERN,
Claim 3
Dependent Claim
76 words
In a process for processing a corrugated foamed thermoplastic resin sheet, which includes extruding a foamable thermoplastic resin composition through a die having a slit die orifice to form a foaming resin sheet, the improvement which comprises: 1 feeding said foaming resin sheet into a nip of a pair of driven rollers, said rollers being an integral part of said die and being studded with a series of projecting, intermeshing teeth arranged in a staggered pattern,
Claim 4
Dependent Claim
76 words
In a process for processing a corrugated foamed thermoplastic resin sheet, which includes extruding a foamable thermoplastic resin composition through a die having a slit die orifice to form a foaming resin sheet, the improvement which comprises: 1 feeding said foaming resin sheet into a nip of a pair of driven rollers, said rollers being an integral part of said die and being studded with a series of projecting, intermeshing teeth arranged in a staggered pattern,
Claim 5
Dependent Claim
70 words
PERMITTING TRANSVERSE AND LONGITUDINAL EXPANSION OF SAID FOAMING RESIN SHEET WITHIN THE NIP OF SAID PAIR OF ROLLERS, WHEREBY A FOAMED RESIN SHEET NIP OF HAVING CORRUGATIONS AND A WAVE PATTERN IN EACH CORRUGATION OF THE EXTRUDING FOAMED RESIN SHEET IS FORMED, THE RESULTING CORRUGATIONS EXTENDING PARALLEL TO THE DIRECTION EXTRUSION AND THE RESULTING WAVE PATTERNS ALONG THE LENGTH OF THE CORRUGATIONS SO THAT EACH CORRUGATION IS ITSELF CORRUGATED, AND
Claim 6
Dependent Claim
70 words
PERMITTING TRANSVERSE AND LONGITUDINAL EXPANSION OF SAID FOAMING RESIN SHEET WITHIN THE NIP OF SAID PAIR OF ROLLERS, WHEREBY A FOAMED RESIN SHEET NIP OF HAVING CORRUGATIONS AND A WAVE PATTERN IN EACH CORRUGATION OF THE EXTRUDING FOAMED RESIN SHEET IS FORMED, THE RESULTING CORRUGATIONS EXTENDING PARALLEL TO THE DIRECTION EXTRUSION AND THE RESULTING WAVE PATTERNS ALONG THE LENGTH OF THE CORRUGATIONS SO THAT EACH CORRUGATION IS ITSELF CORRUGATED, AND
Claim 7
Dependent Claim
27 words
The process of claim 1, wherein the formation of the corrugations of the wave patterns take place simultaneously or within less than 0.2 second of each other.
Claim 8
Dependent Claim
71 words
permitting transverse and longitudinal expansion of said foaming resin sheet within the nip of said pair of rollers, whereby a foamed resin sheet nip of having corrugations and a wave pattern in each corrugation of the extruding foamed resin sheet is formed, the resulting corrugations extending parallel to the direction of extrusion and the resulting wave patterns along the length of the corrugations so that each corrugation is itself corrugated, and
Claim 9
Dependent Claim
71 words
permitting transverse and longitudinal expansion of said foaming resin sheet within the nip of said pair of rollers, whereby a foamed resin sheet nip of having corrugations and a wave pattern in each corrugation of the extruding foamed resin sheet is formed, the resulting corrugations extending parallel to the direction of extrusion and the resulting wave patterns along the length of the corrugations so that each corrugation is itself corrugated, and
Claim 10
Dependent Claim
80 words
The process of claim 1 wherein the corrugations are about equal in size and substantially evenly spaced, the depth and width of each corrugation being about 2 to 10 times the thickness dimension of said foamed sheet, the wave pattern in each corrugation has a wavelength and amplitude that substantially corresponds in dimensions to the width and depth respectively of the corrugations, and the temperature of the die and the foaming resin within it being from about 90*C. to 180*C.
Claim 11
Dependent Claim
13 words
supporting said foamed corrugated resin sheet along the direction of extrusion until cool.
Claim 12
Dependent Claim
13 words
supporting said foamed corrugated resin sheet along the direction of extrusion until cool.
Claim 13
Dependent Claim
13 words
SUPPORTING SAID FOAMED CORRUGATED RESIN SHEET ALONG THE DIRECTION OF EXTRUSION UNTIL COOL.
Claim 14
Dependent Claim
13 words
SUPPORTING SAID FOAMED CORRUGATED RESIN SHEET ALONG THE DIRECTION OF EXTRUSION UNTIL COOL.
Claim 15
Dependent Claim
19 words
The process of claim 1 wherein thE resin of the foamable thermoplastic resin composition is a polymer of ethylene.
Claim 16
Dependent Claim
15 words
The process of claim 1 wherein the resin of the foamable thermoplastic resin is polystyrene.
Claim 17
Dependent Claim
17 words
The process of claim 1 wherein the foamable resin composition contains a volatile substance as blowing agent.
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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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |