CA1131483A - Paper stock sizing system - Google Patents
Paper stock sizing systemInfo
- Publication number
- CA1131483A CA1131483A CA369,299A CA369299A CA1131483A CA 1131483 A CA1131483 A CA 1131483A CA 369299 A CA369299 A CA 369299A CA 1131483 A CA1131483 A CA 1131483A
- Authority
- CA
- Canada
- Prior art keywords
- stock
- component
- flow
- sizing
- rate
- 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
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
- D21H23/765—Addition of all compounds to the pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
- D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH
- D21H23/10—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH at least two kinds of compounds being added
Landscapes
- Paper (AREA)
Abstract
ABSTRACT OF DISCLOSURE
PAPER STOCK SIZING SYSTEM
Sizing components are continuously added to a flowing stream of paper stock and immediately after the ad-dition thereof are mixed together by means of a static in-line mixer. Normally a first component will be added to the pulp and distributed uniformly thereon by means of a static in-line mixer and then a second component will be added and uniformly distributed on the pulp by a static in-line mixer.
PAPER STOCK SIZING SYSTEM
Sizing components are continuously added to a flowing stream of paper stock and immediately after the ad-dition thereof are mixed together by means of a static in-line mixer. Normally a first component will be added to the pulp and distributed uniformly thereon by means of a static in-line mixer and then a second component will be added and uniformly distributed on the pulp by a static in-line mixer.
Description
F:CELD OF THE INVENTION
The present invention relates to an improved sys-tem for the addi~ion of components of sizing composition to paper-making stock ~y continuous and preferably ~equential addition and intimate mixing of the components with pulp slurry.
BACKGROUND TO T~E INVENTION
The addition of sizing materials to paper-making furnish is generally a haphazard arrangement that has evolv-ed over time. In batch systems the sizing ingredients aregenerally added at a selected stage in the process for exam-ple by dumping amounts of sizing materials into the beater.
Where the sizing components are to be added con-tinuously to the flowing stream of paper stock, they gener-ally are simply bled into paper stock line at an appropriate location in the travel of the stock to the paper machiner e.g. it may be added near the fan pump or at the machine chest. The rate of flow of such components is manually adjusted to achieve the desired degree of sizing of the ~0 paper produced from the pulp.
Generally, the sizing chemicals are two component systems wherein the sizing material is held to the pulp fibres by an intermediate formed from the sizing chemical.
The most widely used two component system uses alum and rosin and the present invention will be directed primarily toward the addition of such an alum/rosin sizing composition to a paper stock.
BRIEF DESCRIPTION ON THE INVENTION
It is the object of the present invention to pro-vide a continuous system for blending sizing materials withthe paper-making stock.
Broadly the present invention comprises, continu-ously passing a paper making pulp stock through a line and
The present invention relates to an improved sys-tem for the addi~ion of components of sizing composition to paper-making stock ~y continuous and preferably ~equential addition and intimate mixing of the components with pulp slurry.
BACKGROUND TO T~E INVENTION
The addition of sizing materials to paper-making furnish is generally a haphazard arrangement that has evolv-ed over time. In batch systems the sizing ingredients aregenerally added at a selected stage in the process for exam-ple by dumping amounts of sizing materials into the beater.
Where the sizing components are to be added con-tinuously to the flowing stream of paper stock, they gener-ally are simply bled into paper stock line at an appropriate location in the travel of the stock to the paper machiner e.g. it may be added near the fan pump or at the machine chest. The rate of flow of such components is manually adjusted to achieve the desired degree of sizing of the ~0 paper produced from the pulp.
Generally, the sizing chemicals are two component systems wherein the sizing material is held to the pulp fibres by an intermediate formed from the sizing chemical.
The most widely used two component system uses alum and rosin and the present invention will be directed primarily toward the addition of such an alum/rosin sizing composition to a paper stock.
BRIEF DESCRIPTION ON THE INVENTION
It is the object of the present invention to pro-vide a continuous system for blending sizing materials withthe paper-making stock.
Broadly the present invention comprises, continu-ously passing a paper making pulp stock through a line and
- 2 adding a first sizing component to said stock, mixing said stock with said first sizing component in a continuous in-line static mixer to form a treated pulp stock, adding a second sizing component to the treated stock and uniformly distri~uting the second component thoroughout the stock, preferably via a static in-line mixture.
In the more preferred arrangement~ the flow of stock will be measured and will be proportioned with the measured flows of the first and second components in order to automatically provide the proportions of said components relative to the stock.
Further features, objects and advantages will be evident from the following detailed description of the pre-ferred embodiments of the pre~ent invention taken in con~
junction with the accompanying drawings in which:
Figure 1 is a schematic illustration of one form of sizing system incorporating the present invention.
Figure 2 is a schematic illustration of one type of control mechanizm that may be used to automatically operate the system of Figure 1.
The system illustrated in figure 1 relates to an alum/rosin sizing system but could be used with other sizing components.
In the illustrated arrangement, the paper-making stock from the fibre treatment process (e.g. beating, refin-ing, etc.) is fed via line 14 and i~s rate of flow is measured via the flow meter 16.
The alum sizing component enters the plant and is stored (generally at about 48% solids) in the alum storage container 18. A positive displacement or con~rolled volume pump schematically indicated at 20 pumps the alum through alum line 22 the flow in which is measured via a flow meter 24. A check valve 26 prevents back flow of material from ~ 3~
line 14 into the alum line 22. The alum from the line 22 enters the line 14 and is mixed with the stock in line 14 in the static in-line mixer 28 and the alum treated stock passes on via line 30 toward the machine chest 66.
The rosin sizing component i5 stored in a suitable container such as a rosin storage container generally indicated at 32 and is moved from this storage container via a positive displacement or controlled volume pump generally indicated at 34, through line 36 to a flow meter 38 and a check valve 40 into mixer 54.
Fresh water enters this system via line 44 and in the illustrated arrangement is moved via the positive dis-placement pump or variable volume pump 46 through line 48 to flow meter 50 and a check valve 52 into mixer 54. Thus, the fresh water for the line 44 and the rosin size of line 36 meet at the in-line mixer 54 and are immediatly mixed and quickly passed via line 56 to in-line mixer 62 where they immediately mix with the stock in line 30 and then pass via line 64 into the machine chest 66. A check valve 58 will normally be provided in the line 56 to prevent back flow into line 56 from line 30 and a flow meter 60 may, if desir-ed, be provided to measure the flow in the line 56, although this flow can be determined by the addition of the two flows measured by the flow meters 38 and S0.
The rosin size delivered to the mill is generally relatively high consistency and must be diluted with water before it can be properly mixed with the stock e.g. the rosin in tank 32 may be at a consistency of about 60% sol-ids, whereas the dilute rosin in line 56 will be in the order of 5-10% rosin solids. This dilution with water (depending on the hardness of the water) may cause difficul-ties as a result of the formation of a precipitate that may deposit in the equipment or adversely effect sizing effi-~3~
ciency. However, if the rosin size and water after contactare immediately mixed and then this mixture is immediately mixed with treated stock in-line 30, the probabilities of forming a precipitate and/or reducing sizing ef~iciency are very significantly reduced. Thus, it is important that the water and rosin size be mixed immediately on con~act and that this mixture be immediately added and mixed with the treated stock in line 30. Generally the time ~rom contact of the rosin with water to mixing the resultant rosin water mixture with the treated stock will be less than 3 minutes and pre~erably will not exceed 1 minute.
The control system for the arrangement illustrated in figure 1 is shown schematically in figure 2. The flow of paper-making stock in line 14 is measured by the flow meter 16 and this information is fed to a central controller 68. Similarly, the flow of alum in line 22 is measured via flow meter 24 and the rosin and water flows in the lines 36 and 48 are measured by their respective flow meters 38 and 50 and this information fed to the controller ~8.
The controller 68 controls the positive displace-ment pumps 20, 34 and 46 and thereby proportions the flows in lines 3~ and 48 to obtain the propex ratio of water to rosin size and the required flow rate of ~he alum and rosin water mixture relative to the flow of stock in line 14 Thus the flow of stock in line 14 determines the rate o~
flow of alum in line 22, rosin in line 36 and water in line 48 and the desired ratio of alum to dilute rosin is automat-ically obtained by proper proportioning these flows with ~he flow in line 14 to maintain the proper ratio of alum ~o rosin in the sized stock in the machine chest 66.
Generally the ratio of alum solids to rosin solids will be within the range of 1:1 to 3:1 alum:rosin with the desired degree of sizing being also adjusted by the quantity ~ 3~
of si~ing chemical applied per ton of stock.
Static in line mixers are used after the addition of each of the components i.e. after the addition of alum to the stock which is accomplished in the mixer 28 and then after the addition of rosin to the stock as accomplished in the in-line mixer 62.
The main criteria for selection of the in-line mixer is to ensure there is adequate mixing without develop~
ing undue back pressure and at without apply shear forces to break down the alum or the alum rosin complex and reduce significantly the effective sizing of the stock.
It is possible to use one in-line mixer to accom-plish all of the mixing, however, the rosin size and alum should be added so that either the alum contacts the fibres first or the two contact the fibres substantially simulta-neously. Since the latter is extremely difficult to obtain, it is much preferred to use two static in-line mixers and to premix the alum with the fibres before the rosin is added.
I adequate mixing is obtained in the machine chest the static in~line mixer mixing the rosin with the stock need not bP provided, i.e. the mixer 62 may be elimi-nated and the final mixing be incorporated in the machine chest 66 provided the mixing is done quickly and immediately after dilution of rosin.
Having described the present invention, modifica tion will be evident to those skilled in the art without departing from the spirit of the invention as defined in the appended claims.
In the more preferred arrangement~ the flow of stock will be measured and will be proportioned with the measured flows of the first and second components in order to automatically provide the proportions of said components relative to the stock.
Further features, objects and advantages will be evident from the following detailed description of the pre-ferred embodiments of the pre~ent invention taken in con~
junction with the accompanying drawings in which:
Figure 1 is a schematic illustration of one form of sizing system incorporating the present invention.
Figure 2 is a schematic illustration of one type of control mechanizm that may be used to automatically operate the system of Figure 1.
The system illustrated in figure 1 relates to an alum/rosin sizing system but could be used with other sizing components.
In the illustrated arrangement, the paper-making stock from the fibre treatment process (e.g. beating, refin-ing, etc.) is fed via line 14 and i~s rate of flow is measured via the flow meter 16.
The alum sizing component enters the plant and is stored (generally at about 48% solids) in the alum storage container 18. A positive displacement or con~rolled volume pump schematically indicated at 20 pumps the alum through alum line 22 the flow in which is measured via a flow meter 24. A check valve 26 prevents back flow of material from ~ 3~
line 14 into the alum line 22. The alum from the line 22 enters the line 14 and is mixed with the stock in line 14 in the static in-line mixer 28 and the alum treated stock passes on via line 30 toward the machine chest 66.
The rosin sizing component i5 stored in a suitable container such as a rosin storage container generally indicated at 32 and is moved from this storage container via a positive displacement or controlled volume pump generally indicated at 34, through line 36 to a flow meter 38 and a check valve 40 into mixer 54.
Fresh water enters this system via line 44 and in the illustrated arrangement is moved via the positive dis-placement pump or variable volume pump 46 through line 48 to flow meter 50 and a check valve 52 into mixer 54. Thus, the fresh water for the line 44 and the rosin size of line 36 meet at the in-line mixer 54 and are immediatly mixed and quickly passed via line 56 to in-line mixer 62 where they immediately mix with the stock in line 30 and then pass via line 64 into the machine chest 66. A check valve 58 will normally be provided in the line 56 to prevent back flow into line 56 from line 30 and a flow meter 60 may, if desir-ed, be provided to measure the flow in the line 56, although this flow can be determined by the addition of the two flows measured by the flow meters 38 and S0.
The rosin size delivered to the mill is generally relatively high consistency and must be diluted with water before it can be properly mixed with the stock e.g. the rosin in tank 32 may be at a consistency of about 60% sol-ids, whereas the dilute rosin in line 56 will be in the order of 5-10% rosin solids. This dilution with water (depending on the hardness of the water) may cause difficul-ties as a result of the formation of a precipitate that may deposit in the equipment or adversely effect sizing effi-~3~
ciency. However, if the rosin size and water after contactare immediately mixed and then this mixture is immediately mixed with treated stock in-line 30, the probabilities of forming a precipitate and/or reducing sizing ef~iciency are very significantly reduced. Thus, it is important that the water and rosin size be mixed immediately on con~act and that this mixture be immediately added and mixed with the treated stock in line 30. Generally the time ~rom contact of the rosin with water to mixing the resultant rosin water mixture with the treated stock will be less than 3 minutes and pre~erably will not exceed 1 minute.
The control system for the arrangement illustrated in figure 1 is shown schematically in figure 2. The flow of paper-making stock in line 14 is measured by the flow meter 16 and this information is fed to a central controller 68. Similarly, the flow of alum in line 22 is measured via flow meter 24 and the rosin and water flows in the lines 36 and 48 are measured by their respective flow meters 38 and 50 and this information fed to the controller ~8.
The controller 68 controls the positive displace-ment pumps 20, 34 and 46 and thereby proportions the flows in lines 3~ and 48 to obtain the propex ratio of water to rosin size and the required flow rate of ~he alum and rosin water mixture relative to the flow of stock in line 14 Thus the flow of stock in line 14 determines the rate o~
flow of alum in line 22, rosin in line 36 and water in line 48 and the desired ratio of alum to dilute rosin is automat-ically obtained by proper proportioning these flows with ~he flow in line 14 to maintain the proper ratio of alum ~o rosin in the sized stock in the machine chest 66.
Generally the ratio of alum solids to rosin solids will be within the range of 1:1 to 3:1 alum:rosin with the desired degree of sizing being also adjusted by the quantity ~ 3~
of si~ing chemical applied per ton of stock.
Static in line mixers are used after the addition of each of the components i.e. after the addition of alum to the stock which is accomplished in the mixer 28 and then after the addition of rosin to the stock as accomplished in the in-line mixer 62.
The main criteria for selection of the in-line mixer is to ensure there is adequate mixing without develop~
ing undue back pressure and at without apply shear forces to break down the alum or the alum rosin complex and reduce significantly the effective sizing of the stock.
It is possible to use one in-line mixer to accom-plish all of the mixing, however, the rosin size and alum should be added so that either the alum contacts the fibres first or the two contact the fibres substantially simulta-neously. Since the latter is extremely difficult to obtain, it is much preferred to use two static in-line mixers and to premix the alum with the fibres before the rosin is added.
I adequate mixing is obtained in the machine chest the static in~line mixer mixing the rosin with the stock need not bP provided, i.e. the mixer 62 may be elimi-nated and the final mixing be incorporated in the machine chest 66 provided the mixing is done quickly and immediately after dilution of rosin.
Having described the present invention, modifica tion will be evident to those skilled in the art without departing from the spirit of the invention as defined in the appended claims.
Claims (8)
1. An apparatus for continuously sizing paper-making stock containing fibres comprising means for delivering a first component of a sizing composition to a flowing stream of paper-making stock and injecting the first component into said flowing stream, passing said component and said stock through a static in-line mixer to uniformly distribute said first component over said fibres and provide a treated paper-making stock, means for adding a second sizing compo-nent to said treated stock and means for uniformly distrib-uting said second sizing component over said fibres in said treated pulp stock.
2. An apparatus as defined in Claim 1 wherein said means for uniformly distributing said second component com-prises a second static inline mixer.
3. An apparatus as defined in Claims 1 or 2 further comprise a flow meter for determining the rate of flow of paper-making stock in said stream, means for determining the rate of flow of said stream, means for determining the rate of flow of said first component, further mean for determin-ing the rate of flow of said second component, means for regulating the rate of flow of said first and second compo-nents, means for coordinating the rate of flow of said first and second components with the rate of flow of stock in said stream.
4. A method of sizing a paper-making stock containing fibres comprising, passing said stock as a flowing stream, adding a first sizing component to said flowing stream and mixing said first sizing component with said fibres in a static in-line mixer to form a treated stock, adding a second sizing component to said treated stock and thoroughly distributing said second component on said fibres of said treated pulp stock thereby to provide a sized stock.
5. A method as defined in Claim 4 wherein said first component comprises, alum and wherein said second component comprises a diluted rosin.
6. A method as defined in Claim 5 wherein said dilut-ed rosin is formed by blending rosin with water immediately after contact of said rosin with said water and then imme-diately blending the dilute rosin with the treated stock so that the time between said contact and said blending is less than 3 minutes.
7. A method as defined in Claim 6 wherein said time is less than 1 minute.
8. A method as defined in Claims 4, 5 or 6 further comprising determining the rate of flow of said stream, determining the rate of flow of said first and second compo-nents, adjusting the rate of flow of said first and second components in accordance with the rate of flow in said stream so as to provide said first and second components in the required ratio and required amounts to achieve the desired degree of sizing of said stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA369,299A CA1131483A (en) | 1981-01-26 | 1981-01-26 | Paper stock sizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA369,299A CA1131483A (en) | 1981-01-26 | 1981-01-26 | Paper stock sizing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131483A true CA1131483A (en) | 1982-09-14 |
Family
ID=4119012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA369,299A Expired CA1131483A (en) | 1981-01-26 | 1981-01-26 | Paper stock sizing system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1131483A (en) |
-
1981
- 1981-01-26 CA CA369,299A patent/CA1131483A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |