GB846094A - Improvements in or relating to weight or composition factor measuring apparatus for sheet materials - Google Patents
Improvements in or relating to weight or composition factor measuring apparatus for sheet materialsInfo
- Publication number
- GB846094A GB846094A GB1067656A GB1067656A GB846094A GB 846094 A GB846094 A GB 846094A GB 1067656 A GB1067656 A GB 1067656A GB 1067656 A GB1067656 A GB 1067656A GB 846094 A GB846094 A GB 846094A
- Authority
- GB
- United Kingdom
- Prior art keywords
- potentiometer
- potentiometers
- per unit
- unit area
- weight per
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/203—Measuring back scattering
Abstract
846,094. Photo-electric measurement of sheet materials. DUNLOP RUBBER CO. Ltd. March 21, 1957 [April 7, 1956], No. 10676/56. Class 40(3). Apparatus for the measurement and control of the weight per unit area or the composition of rubber sheet 11 passing over a steel calender bowl 10 comprises two sources of beta radiation of different energy levels, viz. strontium 90, (reference 12) and thallium 204, (reference 13) shielded at 14 and 15, and ionization chambers 16 and 17 to detect radiation back-scattered from the rubber sheet. Alternatively, transmitted gamma radiation may be measured instead of back-scattered beta radiation. Channel A determines the weight per unit area of the sheet and is subject to correction by channel B which determines the composition and is in turn corrected by channel A. A potentiometer 1 a is wound to follow a curve representing the high energy source 12 and a potentiometer 2a wound to follow the curve of the low energy source 13. A potentiometer 1b is wound to obey the law connecting voltage from the ionization chamber for the low energy source and the composition factor at constant weight and a potentiometer 2b is wound to follow the law connecting voltage from the ionization chamber for the high energy source and composition factor at constant weight. Potentiometers 3a and 3b are wound so that their resistance change with rotation is linear. The sliding contacts of potentiometers 1a, 2a and 3a are ganged together on a shaft 4a which is connected to the shaft of a servo-motor 18, one end of each potentiometer winding being connected to a common earth. The sliding contacts of potentiometers 1b, 2b, 3b are similarly ganged on a shaft 4b connected to a servomotor 19. Potentiometer 1a is connected to a servo-motor circuit 20 so that any difference between the voltage supplied by amplifier 21 and that at the sliding contact of potentiometer la causes servo-motor 18 to rotate shaft 4a and adjust the voltage to agree with that from the amplifier. Channel B is similarly connected. Fixed voltages V2a and V2b are fed to the ends of potentiometers 2a and 2b so that the appropriate voltage is fed to the potentiometer with which their sliding contacts are connected. Fixed voltages V3a and V3b are fed to potentiometers 3a and 3b, the sliding contacts of which are connected to meters 24 and 25 to measure deviation in weight per unit area and composition factor respectively of the sheet 11. The output of the measurement is used to control the weight per unit area of the sheet by altering the nip of the calender bowls. Instead of indicating variations in weight per unit area from a predetermined value at meter 24 a meter may be provided to measure directly the voltage of the sliding contacts of potentiometer 3a calibrated in divisions of weight per unit area. A similar modification may be applied to the composition factor meter. Alternatively potentiometers 1b and 2b may be ganged together on the shaft of another servo-motor fed by an amplifier which amplifies the difference between voltages fed from the sliding contacts of potentiometers 3a and 3b. (Fig. 3 not shown).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1067656A GB846094A (en) | 1956-04-07 | 1956-04-07 | Improvements in or relating to weight or composition factor measuring apparatus for sheet materials |
DED25328A DE1026540B (en) | 1956-04-07 | 1957-04-05 | Device for continuous area weight determination of plates, webs or the like. |
MY6300052A MY6300052A (en) | 1956-04-07 | 1963-12-31 | Improvements in or relating to weight or composition factor measuring apparatus for sheet materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1067656A GB846094A (en) | 1956-04-07 | 1956-04-07 | Improvements in or relating to weight or composition factor measuring apparatus for sheet materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB846094A true GB846094A (en) | 1960-08-24 |
Family
ID=9972224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1067656A Expired GB846094A (en) | 1956-04-07 | 1956-04-07 | Improvements in or relating to weight or composition factor measuring apparatus for sheet materials |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1026540B (en) |
GB (1) | GB846094A (en) |
MY (1) | MY6300052A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994027138A1 (en) * | 1993-05-13 | 1994-11-24 | Fagus-Grecon Greten Gmbh & Co. Kg | Process for establishing the apparent density over the thickness of a board |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1225396B (en) * | 1957-01-28 | 1966-09-22 | Dunlop Rubber Co | Device for continuous, non-contact surface weight determination of a strip |
US5029337A (en) * | 1989-01-19 | 1991-07-02 | Tava Corporation | Method for measuring coating thickness |
DE3907617C1 (en) * | 1989-03-09 | 1990-08-09 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung Ev, 8000 Muenchen, De | Method for determining the density of laminar wooden materials |
-
1956
- 1956-04-07 GB GB1067656A patent/GB846094A/en not_active Expired
-
1957
- 1957-04-05 DE DED25328A patent/DE1026540B/en active Pending
-
1963
- 1963-12-31 MY MY6300052A patent/MY6300052A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1994027138A1 (en) * | 1993-05-13 | 1994-11-24 | Fagus-Grecon Greten Gmbh & Co. Kg | Process for establishing the apparent density over the thickness of a board |
Also Published As
Publication number | Publication date |
---|---|
DE1026540B (en) | 1958-03-20 |
MY6300052A (en) | 1963-12-31 |
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