ES335317A1 - Reducing sheet breaks at roll coaters - Google Patents
Reducing sheet breaks at roll coatersInfo
- Publication number
- ES335317A1 ES335317A1 ES335317A ES335317A ES335317A1 ES 335317 A1 ES335317 A1 ES 335317A1 ES 335317 A ES335317 A ES 335317A ES 335317 A ES335317 A ES 335317A ES 335317 A1 ES335317 A1 ES 335317A1
- Authority
- ES
- Spain
- Prior art keywords
- web
- control
- coaters
- defects
- detected
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/04—Paper-break control devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
Landscapes
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Coating Apparatus (AREA)
- Paper (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
Abstract
Defects in a travelling web of paper 11 are detected photo-electrically before sections of the web having defects reach coating apparatus 12, 13, so that the latter may be deactivated to allow the faulty sections to pass through uncoated and thereby prevent fouling of the coating apparatus and breaking of the web. In one arrangement, Fig. 1 holes and relatively thin parts of the web are detected by photo-electric inspection apparatus 16, 17 which may comprise a single light source-detector combination or an array of these. If the intensity transmitted by the web is above the level set in automatically- or manually-adjustable means 20, indicating the presence of a fault, relay 18 is actuated to activate sequencing device 21. This causes: marking of the defective web section (via control 23) disengagement of coating rollers from the web or lowering of the pans of coating fluid in coaters 12, 13 (via control 24) and disengagement of the coater wiper blades (via control 25). Also a timer or footage control 26 is started. The defective portion of web is allowed to pass through the coaters uncoated, and after a predetermined time set into control 26, a second sequencing device 29 is activated and the timer 26 stopped and reset. The device 29 controls reactivation of the coating apparatus by reengagement of rollers, wipers &c., and resetting of relay 18. In a modification, Fig. 2 (not shown), defects are detected as instantaneous variations of mass per unit area from an average value of transmitted light. Variations above a pre-set value control deactivation of the coaters for a pre-set time which can be adjusted. Parts of this control system are described in more detail i.e. the device which compares the variation level with a predetermined value, Fig. 3 (not shown) the deactivation sequencing device, Fig. 4 (not shown) and the device for producing a signal representative of the instantaneous variation from the average value, Fig. 5 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US518802A US3380431A (en) | 1966-01-05 | 1966-01-05 | Reducing sheet breaks at roll coaters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES335317A1 true ES335317A1 (en) | 1968-04-01 |
Family
ID=24065564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES335317A Expired ES335317A1 (en) | 1966-01-05 | 1967-01-05 | Reducing sheet breaks at roll coaters |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3380431A (en) |
| JP (1) | JPS4922277B1 (en) |
| DE (1) | DE1648351A1 (en) |
| ES (1) | ES335317A1 (en) |
| FR (1) | FR1507489A (en) |
| GB (1) | GB1158899A (en) |
| SE (1) | SE339395B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3521551A (en) * | 1968-03-19 | 1970-07-21 | Morrison Machine Co | Apparatus for controlling calenders |
| US5026989A (en) * | 1985-10-07 | 1991-06-25 | Nordson Corporation | System for monitoring material dispensed onto a substrate |
| EP0275334B1 (en) * | 1985-10-07 | 1991-06-05 | Nordson Corporation | System for monitoring material dispensed onto a subtrate |
| JPH0778233A (en) * | 1993-09-07 | 1995-03-20 | Nordson Kk | Detection |
| DE102009007649B4 (en) * | 2008-02-07 | 2017-10-26 | Valmet Technologies, Inc. | Method and arrangement for reducing web breaks in the manufacture of paper or board |
| CN115106257B (en) * | 2022-06-22 | 2023-07-18 | 广东聚德机械有限公司 | Coating machine and corresponding coating method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551329A (en) * | 1946-08-15 | 1951-05-01 | Technicolor Motion Picture | Film treating apparatus |
| US3079889A (en) * | 1959-06-03 | 1963-03-05 | Black Clawson Co | Paper machinery |
| US3190261A (en) * | 1960-09-28 | 1965-06-22 | Lab For Electronics Inc | Control system |
| US3220377A (en) * | 1962-03-29 | 1965-11-30 | West Virginia Pulp & Paper Co | Control of machine components |
| US3290167A (en) * | 1963-07-01 | 1966-12-06 | American Mach & Foundry | Motion responsive flaw marking apparatus and method |
-
1966
- 1966-01-05 US US518802A patent/US3380431A/en not_active Expired - Lifetime
- 1966-11-15 GB GB51089/66A patent/GB1158899A/en not_active Expired
- 1966-12-30 JP JP42000750A patent/JPS4922277B1/ja active Pending
-
1967
- 1967-01-05 SE SE00225/67A patent/SE339395B/xx unknown
- 1967-01-05 FR FR5041A patent/FR1507489A/en not_active Expired
- 1967-01-05 DE DE19671648351 patent/DE1648351A1/en active Pending
- 1967-01-05 ES ES335317A patent/ES335317A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1507489A (en) | 1967-12-29 |
| US3380431A (en) | 1968-04-30 |
| SE339395B (en) | 1971-10-04 |
| GB1158899A (en) | 1969-07-23 |
| JPS4922277B1 (en) | 1974-06-07 |
| DE1648351A1 (en) | 1972-01-27 |
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