US4242783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calender roll for use in super calender for magnetic tapes
Assignee: Fujifilm Holdings Corp
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Filing: 1978-07-11
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Granted: 1981-01-06
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Expires: 1998-07-11
Abstract
Abstract An elastic calender roll for use in a super calender for magnetic tape is disclosed, which comprises a roll core and a roll portion which is composed of a fibrous material molded with a plastic material. The fibrous material has a better heat resistivity than that of the plastic material and the surface portion of the calender roll is of the plastic material and has a Shore hardness of at least 80 degrees.
Inventors
- 👤 Kenji Watanabe
- 👤 Goro Akashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
F; F16; F16C; F16C13/00; G; G11; G11B; G11B5/00; G11B5/84
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion coprises an inner roll portion of fibrous material on which is molded an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound on said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of glass fibers; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 2
Dependent Claim
153 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion coprises an inner roll portion of fibrous material on which is molded an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound on said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of glass fibers; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 3
Dependent Claim
16 words
The improvement claimed in claim 1, wherein said glass fibers are in the form of canvas.
Claim 4
Dependent Claim
16 words
The improvement claimed in claim 1, wherein said glass fibers are in the form of cloth.
Claim 5
Dependent Claim
16 words
The improvement claimed in claim 1, wherein said glass fibers are in the form of thread.
Claim 6
Dependent Claim
18 words
The improvement claimed in claim 1, wherein said glass fibers are in the form of cotton like material.
Claim 7
Dependent Claim
153 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion comprises an inner roll portion of fibrous material on which is molded on an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of carbon fibers; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 8
Dependent Claim
153 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion comprises an inner roll portion of fibrous material on which is molded on an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of carbon fibers; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 9
Dependent Claim
154 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion comprises an inner roll portion of fibrous material on which is molded an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound on said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of fine steel cords; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 10
Dependent Claim
154 words
In a super-calender roll for super-calendering the magnetic surface of a magnetic recording medium and having a core and a roll portion secured to said core, the improvement wherein: said roll portion comprises an inner roll portion of fibrous material on which is molded an outer roll portion of polyamide resin, the outer surface of said outer roll portion having a super smooth surface and being free of said fibrous material; said inner roll portion comprising a plurality of layers of said fibrous material wound on said core, the thickness of said plurality of layers being 20 to 30 mm; said outer roll portion has a thickness of about 10 to 15 mm, and said polyamide resin has a linear expansion co-efficient from about 8×10 -5 /°C. to about 8×10 -4 /°C.; said fibrous material is made of fine steel cords; and the hardness of said outer surface is at least 80 degrees Shore.
Claim 11
Dependent Claim
38 words
The improvement claimed in claims 1, 2, 6, 7, 3, 4 or 5, wherein said polyamide resin has a molecular weight of from about 10,000 to about 1,000,000 and a polymerization degree of about 150 to about 3,000.
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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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |