US193261A - Improvement in processes for preparing wood for mechanical reduction to paper-pulp - Google Patents
Improvement in processes for preparing wood for mechanical reduction to paper-pulp Download PDFInfo
- Publication number
- US193261A US193261A US193261DA US193261A US 193261 A US193261 A US 193261A US 193261D A US193261D A US 193261DA US 193261 A US193261 A US 193261A
- Authority
- US
- United States
- Prior art keywords
- wood
- paper
- processes
- pulp
- improvement
- 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
- 239000002023 wood Substances 0.000 title description 28
- 238000000034 method Methods 0.000 title description 8
- 229920001131 Pulp (paper) Polymers 0.000 title description 4
- 239000002253 acid Substances 0.000 description 8
- 150000007513 acids Chemical class 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229920000591 gum Polymers 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 241000219000 Populus Species 0.000 description 4
- 230000002939 deleterious Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 241000218657 Picea Species 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000007844 bleaching agent Substances 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
Definitions
- Woods used in the manufacture of pulp for paper-stock should all be cut in the winter season, while the grain of the wood is comparatively free from sap, and before it begins to ascend in the spring. This involves the necessity of keeping a large supply of the wood on hand for several months, or during the whole of the remainder of the year, as it is unfit for use when full of sap or frozen.
- I purpose by my invention, to accomplish the desired object at areasonable expense, and without the difliculties encountered in packed.
- At the bottom of this tank is an 7 opening, through which the water, of a temperature under the boiling-point, is forced, by a hydraulic press, to such an extent as completely to saturate and thoroughly to permeate the wood, and to soften and drive out of the pores the gum, the resin, and the acids. This may be somewhat aided by the introduction of a small quantity of some alkaline substance to partially acton the acids, but not sufficient to color the wood.
- an opening is made in the top of the tank, provided with a valve, gaged to allow the water, at any regulated high pressure, to pass 011', thus constantly washing away the impurities rendered soluble and free by the introduction of the heated slightly alkaline water.
- the wood is continued in this condition until it is cleansed, freshened, and softened fit for the grindingmachines.
Description
UNITED S'r'rEs PATENT OFFICE.
GEORGE E. MARSHALL, OF TURNERS FALLS, MASSACHUSETTS.
IMPROVEMENT IN PROCESSES FOR PREPARING WOOD FOR MECHANICAL REDUCTION T0 PAPER-PUL P.
Specification forming part of Letters Patent No. 193,261, dated July 17, 1877 application filed June 30, 1877. v
' poplar, and other woods preparatory to their being used in the manufacture of woodpulp for making paper-stock.
It is well known that poplar, spruce, and
other Woods used in the manufacture of pulp for paper-stock should all be cut in the winter season, while the grain of the wood is comparatively free from sap, and before it begins to ascend in the spring. This involves the necessity of keeping a large supply of the wood on hand for several months, or during the whole of the remainder of the year, as it is unfit for use when full of sap or frozen.
In keeping the wood for use several months, it, of course, becomes seasoned, and comparatively dry and hard, the gum, resin, acetic, and pinic acids become hard and fixed in the grain of the wood, and more or less insoluble. To removethese substances, and to render the wood fresh and soft for the best working condition, many processes have been attempted, but none with entire success. The wood has been boiled with alkalies and Without. It has also been subjected to great pressure with steam, and other treatments, somewhat varied from these, have been tried; but in all these processes the wood is discolored-in some more than others-pausing an additional expense to bleach it, and some of them are very expensive in the consumption of fuel and of chemicals.
I purpose, by my invention, to accomplish the desired object at areasonable expense, and without the difliculties encountered in packed. At the bottom of this tank is an 7 opening, through which the water, of a temperature under the boiling-point, is forced, by a hydraulic press, to such an extent as completely to saturate and thoroughly to permeate the wood, and to soften and drive out of the pores the gum, the resin, and the acids. This may be somewhat aided by the introduction of a small quantity of some alkaline substance to partially acton the acids, but not sufficient to color the wood.
To aid in this operation, and to allow the superfluous and deleterious matter thus disengaged from the wood to pass away, an opening is made in the top of the tank, provided with a valve, gaged to allow the water, at any regulated high pressure, to pass 011', thus constantly washing away the impurities rendered soluble and free by the introduction of the heated slightly alkaline water. The wood is continued in this condition until it is cleansed, freshened, and softened fit for the grindingmachines.
What I claim, in preparing wood for the mechanical manufacture of pulp for paper-stock, 18-- The process of removing the gum, acids, and other deleterious matter preparatory to grinding, by subjecting the wood to a high degree of pressure of water under the boiling-point, all substantially as described.
Witness my hand this 25th day of June, A. D. 1877.
. GEO. E. MARSHALL.
Witnesses:
W. H. P. GILMORE, W. D. RUSSELL.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US193261A true US193261A (en) | 1877-07-17 |
Family
ID=2262667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US193261D Expired - Lifetime US193261A (en) | Improvement in processes for preparing wood for mechanical reduction to paper-pulp |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US193261A (en) |
-
0
- US US193261D patent/US193261A/en not_active Expired - Lifetime
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