US4574634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic paper testing apparatus
Assignee: WESTVACO Corp A DE CORP
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Filing: 1984-08-09
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Granted: 1986-03-11
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Expires: 2004-08-09
Abstract
Abstract A fully automatic test system is provided to nondestructively determine the elastic constant information of paper samples. Two ultrasonic wave sensors are mounted in alignment with the instrument frame at respective distances from an ultrasonic generator. A motor driven turntable beneath the sensors and generator supports a paper test specimen for automatic progression of the specimen fiber orientation relative to the sonic wave propogational direction. Electronic data processing equipment resolve ultrasonic emission and reception signals for quantitative determination of the sonic velocity through four directional transmission modes of a specimen. Such sonic velocity data enables determination of four in-plane elastic parameters.
Inventors
- 👤 Dominic A. Pappano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:54
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/07; G01N33/00; G01N33/34; G01N33/346; G01N2291/00; G01N2291/02; G01N2291/023; G01N2291/0237; G01N2291/04; G01N2291/042; G01N2291/0422
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
186 words
An apparatus for sonically determining the strength moduli of a sheet of paper comprising: (a) a planar surface turntable for mounting a subject paper sample thereon, said turntable being rotatable about a central axis perpendicular to said planar surface and having rotational stop positions at a point of angular origin, a point of rotation 45° away from said origin position and a rotational point 90° away from said origin position; (b) a supporting base for said turntable; (c) a pair of bracket arms projecting from said base on substantially opposite sides of said turntable; (d) a slide beam secured between the distal ends of said brackets above said turntable; (e) at least three sonic transducer units secured to said slide beam in parallel alignment therewith by suspension means, each of said transducer units having a directionally oriented sonic wave simulation stylus disposed thereon for selective engagement with the surface of a paper sample on said turntable, said suspension means comprising means to simultaneously disengage the styli of said transducers from said paper sample surface and to rotate said styli for angular displacement of said orientation direction.
Claim 2
Independent Claim
186 words
An apparatus for sonically determining the strength moduli of a sheet of paper comprising: (a) a planar surface turntable for mounting a subject paper sample thereon, said turntable being rotatable about a central axis perpendicular to said planar surface and having rotational stop positions at a point of angular origin, a point of rotation 45° away from said origin position and a rotational point 90° away from said origin position; (b) a supporting base for said turntable; (c) a pair of bracket arms projecting from said base on substantially opposite sides of said turntable; (d) a slide beam secured between the distal ends of said brackets above said turntable; (e) at least three sonic transducer units secured to said slide beam in parallel alignment therewith by suspension means, each of said transducer units having a directionally oriented sonic wave simulation stylus disposed thereon for selective engagement with the surface of a paper sample on said turntable, said suspension means comprising means to simultaneously disengage the styli of said transducers from said paper sample surface and to rotate said styli for angular displacement of said orientation direction.
Claim 3
Dependent Claim
81 words
An apparatus as described by claim 1 wherein said suspension means comprises linear stroking means for engaging said styli with said paper sample in a first directional orientation alignment at one end of a stroke length, for engaging said styli with said paper sample in a second directional orientation alignment 90° rotated from said first at the other end of said stroke length and for withdrawing said styli from engagement with said paper sample at an intermediate position between said ends.
Claim 4
Dependent Claim
48 words
An apparatus as described by claim 1 comprising data processing means and drive means respective to said turntable rotation and said stroking means, said data processing means being connected with said drive means to control the orientation of said styli relative to the orientation of said paper sample.
Claim 5
Dependent Claim
35 words
An apparatus as described by claim 3 wherein said data processing means is connected with said transducer units to control the excitation on one sonic transducer unit and receive signals from the other transducer units.
Claim 6
Dependent Claim
32 words
An apparatus as described by claim 4 wherein said data processing means is programmed to coordinate said transducer unit excitation and reception with the orientation of said paper sample and said styli.
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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |