US496275A - Joshua norton - Google Patents
Joshua norton Download PDFInfo
- Publication number
- US496275A US496275A US496275DA US496275A US 496275 A US496275 A US 496275A US 496275D A US496275D A US 496275DA US 496275 A US496275 A US 496275A
- Authority
- US
- United States
- Prior art keywords
- digester
- norton
- joshua
- acid
- wood
- 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 - Lifetime
Links
- 239000002253 acid Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 10
- 239000002023 wood Substances 0.000 description 10
- 239000003513 alkali Substances 0.000 description 6
- 238000010411 cooking Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-L Sulphite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 4
- 229920000591 gum Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002522 swelling Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/02—Rotary digesters
Definitions
- the object of my invention is the production of fiber for paper from the waste of saw and planing mills and the like.
- the improvements are adapted to either the acid or alkali process, and to the use of chips of wood such as are-commonly used by the various acid and alkali processes; It is however more especially intended for the utilization of saw dust and planing mill shavings by the acid or sulphite process.
- Heretofore experiments made with saw-dust and mill shavings by either acid or alkali processes have been defective and practical failures by reason of the uneven or partial cooking of the material. It has been found that the wood near the shell of the digester was fairly well cooked while the larger portion contained in the center was but partially acted upon by the chemicals.
- Figure l is a central section of an improved digester and Fig. 2 is a similar view at right angles to the view in Fig. 1.
- A denotes a digester preferably of the globe type provided with an acid resisting lining 1.
- This globular digester is provided with journals 21 adapted to revolve in suitable bearings as usual. The revolution of the digester keeps most of its contents in motion, but to prevent packing near its axial line where such motion is at a minimum, the following means are provided.
- the breaking plate is secured at each end to the shell of the digester by means of brackets 2 or otherwise. It is provided with curved flanges 2" to facilitate its passage through the contents of the digester and to add to the quantity of pulp lifted or acted upon.
- a steam inlet pipe extending to near the center of the digester is an important feature. The steam is centrally discharged and operates at the points where its action is most desired and the centrally located breaker co-operates with said inwardly extended pipe in loosening and opening the central parts of the mass of fiber. Furthermore the pipe and breaker are attached and stay and support each other.
- the apparatus is operated as follows: The saw-dust or shavings having been sifted to remove the fine non-fibrous dust, and dirt, are
- Acid of about 5 Baum of density and of about 26 to 30 strength by theiodine test is preferred. This is about one third less than the strength of acid ordinarily used, and its use is found in practice to producea stronger fiber at a reduced expense.
- the breaking plate situated at the diameter of the digester, and fixed to its walls lengthwise in the plane of rotation, said plate having curved flanges upon one side of its center and oppositely ing witnesses.
Description
(No Model.)
J. NORTON, Jr. PULP DIGBSTER.
No. 496,275. Patented Apr. 25-, 1893.
m: scams PUERS ca. PHOTD-LITNQ. wnsl-unm'ou. b. c.
UNITED STATES PATENT OFFICE.
JOSHUA NORTON, JR., OF CHATHAM, CANADA.
PU LP-DIGESTER.
SPECIFICATION forming part of Letters Patent No. 496,275, dated April 25, 1893.
Application filed October 9, 1891. Serial No. 408.211. (No model.) I
To all whom it may concern.-
Be it known that I, JOSHUA NORTON, J r., a resident of Ohatham, in the Province of New Brunswick, Canada, have invented certain new and useful Improvemeutsin Pulp-Digesters; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.
The object of my invention is the production of fiber for paper from the waste of saw and planing mills and the like. The improvements are adapted to either the acid or alkali process, and to the use of chips of wood such as are-commonly used by the various acid and alkali processes; It is however more especially intended for the utilization of saw dust and planing mill shavings by the acid or sulphite process. Heretofore experiments made with saw-dust and mill shavings by either acid or alkali processes have been defective and practical failures by reason of the uneven or partial cooking of the material. It has been found that the wood near the shell of the digester was fairly well cooked while the larger portion contained in the center was but partially acted upon by the chemicals. This apparently has been caused by the fineness of the dust or shavings and by the tendency of the gum in the wood to become sticky when first heated, and by the swelling and close packing caused by absorption of water. A compact mass is formed and becomes so firmly gummed together by the action of heat and other agencies that the reducing solution can not penetrate it.
Figure l is a central section of an improved digester and Fig. 2 is a similar view at right angles to the view in Fig. 1.
A denotes a digester preferably of the globe type provided with an acid resisting lining 1. This globular digesteris provided with journals 21 adapted to revolve in suitable bearings as usual. The revolution of the digester keeps most of its contents in motion, but to prevent packing near its axial line where such motion is at a minimum, the following means are provided.
3 denotes a steam inlet pipe which passes through one or both of the journals to near the center of the digester where it is by preference attached to a partial diaphragm or breaking plate 2 by means of an extension 3' or otherwise. I
3" indicates a discharge nozzle. The breaking plate is secured at each end to the shell of the digester by means of brackets 2 or otherwise. It is provided with curved flanges 2" to facilitate its passage through the contents of the digester and to add to the quantity of pulp lifted or acted upon. bined with a steam inlet pipe extending to near the center of the digester is an important feature. The steam is centrally discharged and operates at the points where its action is most desired and the centrally located breaker co-operates with said inwardly extended pipe in loosening and opening the central parts of the mass of fiber. Furthermore the pipe and breaker are attached and stay and support each other.
The apparatus is operated as follows: The saw-dust or shavings having been sifted to remove the fine non-fibrous dust, and dirt, are
put into the digester and Well packed. A proper quantity of sulphite liquor is then i'ntroduced, the cover secured, steam let on and the digester set in motion. The cooking begins and the revolving motion causes the breaking plate 2 to continually separate the contents of the digester. This together with the action of the steam in its continuous passage from center to outside keeps up sufficient agitation to prevent the formation of balls or large bodies of solid material at the critical time when the gum has been softened but not destroyed. During the process of cooking the usual attention is required but as the wood is in much smaller particles than heretofore customarilyemployed about one half the usual time is required to cook it. grades eight hours has been found to be sufficient and a considerable increase in output results. Acid of about 5 Baum of density and of about 26 to 30 strength by theiodine test is preferred. This is about one third less than the strength of acid ordinarily used, and its use is found in practice to producea stronger fiber at a reduced expense. When the wood has been sufficiently cooked, the revolution of the digester is stopped with the cover 19 up- This breaker com- In the commoner permost and is relieved of its steam pressure through the outlet pipe 20 suitably provided with acock. The digester is then turned half over and the spentliquor discharged through the same outlet. The cover is then removed and the contents of the digester emptied.
Having described my invention and explained my process, what I claim is 1. In a revolving digester, the breaking plate situated at the diameter of the digester, and fixed to its walls lengthwise in the plane of rotation; substantially as set forth.
2. In a revolving digester, the breaking plate situated at the diameter of the digester, and fixed to its walls lengthwise in the plane of rotation, said plate having curved flanges upon one side of its center and oppositely ing witnesses.
' J OSIIUA NORTON, JR. \Vitnesses:
G. B. FRASER, J. K. Goecm.
Publications (1)
Publication Number | Publication Date |
---|---|
US496275A true US496275A (en) | 1893-04-25 |
Family
ID=2565113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US496275D Expired - Lifetime US496275A (en) | Joshua norton |
Country Status (1)
Country | Link |
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US (1) | US496275A (en) |
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0
- US US496275D patent/US496275A/en not_active Expired - Lifetime
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