CA1116453A - Grinding elements of a grinding mill, especially for a production of special kinds of papers and cardboard - Google Patents
Grinding elements of a grinding mill, especially for a production of special kinds of papers and cardboardInfo
- Publication number
- CA1116453A CA1116453A CA000337881A CA337881A CA1116453A CA 1116453 A CA1116453 A CA 1116453A CA 000337881 A CA000337881 A CA 000337881A CA 337881 A CA337881 A CA 337881A CA 1116453 A CA1116453 A CA 1116453A
- Authority
- CA
- Canada
- Prior art keywords
- grooves
- flatter
- narrower
- angle
- grinding elements
- 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
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/306—Discs
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to grinding elements of a grind-ing mill, especially for a production of special kinds of paper and cardboard, e.g. as an imitation of parchment, tracing paper, deep-drawing trunk cardboard, etc. When grinding, it is neces-sary to ensure a perfect fibrillation of fibres and an outlet homogeneity of the ground compound. The invention provides a new design of grinding elements of grinding mills made of steel, which replaces basalt-lava grinding elements and obviates dis-advantages of existing grinding elements at ensuring the desired quality of the compound. Grinding elements according to the invention consist of a fixed disc and of a rotating one. Both discs are provided in their function surfaces with a system of three types of straight grooves. The first grooves are widest and deepest and they make with a radial line against the sense of rotation an acute angle ? = 10° up to 20°, to them the second narrower and flatter grooves link up and they make with the radial line against the sense of revolution an angle .beta. = 3?.
To the second grooves the third narrowest and flattest grooves link up and they make with them an angle ? = 80° up to 100°.
The invention relates to grinding elements of a grind-ing mill, especially for a production of special kinds of paper and cardboard, e.g. as an imitation of parchment, tracing paper, deep-drawing trunk cardboard, etc. When grinding, it is neces-sary to ensure a perfect fibrillation of fibres and an outlet homogeneity of the ground compound. The invention provides a new design of grinding elements of grinding mills made of steel, which replaces basalt-lava grinding elements and obviates dis-advantages of existing grinding elements at ensuring the desired quality of the compound. Grinding elements according to the invention consist of a fixed disc and of a rotating one. Both discs are provided in their function surfaces with a system of three types of straight grooves. The first grooves are widest and deepest and they make with a radial line against the sense of rotation an acute angle ? = 10° up to 20°, to them the second narrower and flatter grooves link up and they make with the radial line against the sense of revolution an angle .beta. = 3?.
To the second grooves the third narrowest and flattest grooves link up and they make with them an angle ? = 80° up to 100°.
Description
The invention relates to grinding elements o~ a grind-ing mill, especially for a production of special kinds of paper and cardboard.
For a production of some kinds of paper and cardboard, as e.g. imitation parchment, tracing paper, deep-drawing trunk cardboard, etc., it is necessary during the grinding process to ensure a perfect fibrillation of fibres and outlet homogeneity of the compound grinding. For these purposes there are known grinding mills, the grinding elements of which are made of a porous basalt-lava. But their disadvantage resides in a low service life, high costs and difficulties in obtaining suitable raw material. Efforts to replace basalt-lava grinding elements by relatively cheap steel grinding elements of a high service life provide many problems. Requirement for a perfect fibrilla- -tion of fibres causes an increase of a non-effective pumping in-put as well as an increase of a specific power consumption.
So. e.g. for a production of an imitation parchment, the compound is ground for 84 - 87~ SR and a specific consumption of power for grinding reaches in a basalt-lava pulp engine 550 -700 XWh/t, and as to disc mills and conical ones, provided withsteel grinding elements, their specific power consumption is in the range 750 up to 950 kWh/t. Another disadvantage of hitherto known grinding mills provided with steel milling elements re-sides in the fact that the quality of the compound only approach-es to technological requirements as to the homogeneity in a per-fection of a fibre fibrillation.
The aim of the invention is to solve a design of steel grinding elements of grinding mills for a producticn of special kinds of paper and cardboard, which may replace basalt-lava grinding elements and which may obviate disadvantages of the hitherto known grinding elements.
This problem i5 solved by the invention of grinding ~6~t,~
elements of grinding mills, especially for a production of spe-cial kinds of paper and cardboard, consisting of at least of one fixed disc and of one rotating disc, the function surfaces of which -let they be plane or conical -are provided with systems of grooves, having various depth and width. The principle of the invention resides in the fact, that on function surfaces of the discs there are made systems of three types of ,traight grooves ~eing graded in width and depth and mutually linking up, of which the first widest and deepest grooves make together with a radial l.ine against the sense of rotation of a rotating disc an angle ~ in a range 10 up to 20, the second narrower and flatter grooves make with a radial line against the sense of rotation an angle ~ = 3~, the third narrowest and flattest grooves are directed against the sense of rotation of the rotating disc and they make together with the second narrower and flatter grooves and angle ~ in the range 80 up to 100, the number of the second narrower and flatter grooves is for each first and deepest groove at least doubled, and :Eor each cm of length of the second narrower and flatter groove there exist 1,25 up to 2 20 third narrowest and flattest grooves, the heginnings of the first widest and deepest grooves of the fixed disc are closed and the ends of them are open, the beginnings of the first widest and - deepest grooves of the rotating disc are open and the ends of them are closed, the second narrower and flatter grooves are open at the outer circumference of the fixed disc and they are . closed at the outer circumference of the rotating disc, the ends of the third narrowest and flattest grooves are closed.
The principle of the invention also resides in the fact that the widest and deepest grooves transit in their ends into the second narrower and flatter grooves.
The principle of the invention also resides in the fact, that the angle ~, which is made by the first widest and deepest grooves together with the radial line, is 15, that the angle ~, which is made by the second narrower and flatter grooves together with the radial line, is 45, and that the angle ~, which is made by the third narrowest and flattest grooves together with the second narrower and flatter grooves, is 90.
The principle of the invention also resides in the fact that the widths of the mutually corresponding grooves of the fixed disc and of the rotating one are identicalD
The principle of the invention also resides in the fact that the depths of the mutually corresponding grooves of the fixed disc and of the rotating one are identical.
An intensive fibrillation of fibres having a completely comparable character with the work of basalt-lava grinding ele-ments is a result of the described mechanism.
The advantage of the grinding elements according to the invention resides in the fact that they may be manufactured by an ordinary working process and made of steels resistent against wear and tear, what ensures their long service life and low price.
Tests that were carried out with grinding elements according to the invention proved, that they are completely com-parable with basalt-lava grinding elements as to the fibrilla-tion of cellulose, and more over their service life is longer and the specific consumption is lower than those ones of the basalt-lava grinding elements. So e.g. at grinding for imitation parchment the specific power consumption was in the range 510 -550 kWh/t.
The tests also showed that grinding elements according to the invention will be advantageous not only for special ~ine-ground paper as e.g~ imitation parchment, tracing paper etc., but they may he applied in a production of strong paper if there is required to increase mechanical properties already at a low 11.~6~3 stage of grinding. Another application area is a finish grind-ing of old paper, when it is required to renew the plasticity and weave ability of fibres of a limited shortened effect.
In one aspect of the present invention there is pro-vided grinding elements for a grinding mill, especially for the production of special kinds of paper and cardboard, comprising at least one fixed disc and one rotating disc, the working sur-faces of the said discs being in a plane or of conical shape and provided with groups of grooves of various widths and depths, further comprising that on the working surfaces of the discs there are provided spaced groups of three types of straight grooves each being of varying width and depth and mutually link~
ing up, one with another, of which, respective a group, the first widest and deepest groove is inclined against the sense of rotation of a rotating disc, making together with a radial line an angle ~ having a range 10 to 20, the second narrower and flatter groove is inclined against the sense of rotation, making together with a radial line an angle ~ = 3~, the third narrow-est and flattest groove is also directed against the sense of rotation of the rotating disc and makes together with the second narrower and flatter groove an angle ~ having a range ~30 to 100, there are at least two second narrower and flatter groove extending from each first widest and deepest groove and for each 1 cm of length of the second narrower and flatter groove there are spaced 1.25 to 2 third narrowest and flattest grooves, the beginnings of the first widest and deepest grooves of the fixed disc are closed and the ends of them are open at the outer circumference of the disc, the beginnings of the first widest and deepest grooves of the rotating disc are open and the ends of them are closed adjacent the outer circumference of the disc, the second narrower and flatter grooves are open at the outer circumference of the fixed disc and they are ~llf~ t~
closed at the outer circumference of the rotating disc, and the ends of the third narrowest and flattest grooves are closed on both discs.
In order that the invention may be clearly understood and readily carried into effect, two preferred embodiments thereof are, by way of example, hereinafter more fully described and illustrated in the accompanying drawings, in which:
Embodiment 1 Figure 1 shows a section of a working part of a grind-ing mill, Figure 2 shows a detail of a working surface of a fixed disc, Figure 3 shows a detail of a working surface of a rotating disk;
Figure 6 shows a section of a fixed disc according to Figure 2, Figure 7 shows a section of a rotating disc according to Figure 2, Embodiment 2 Figure 4 shows a detail of a working surface of a function surface of a fixed disc, - Figure 5 shows a detail of a working surface of a : rotating disc.
A device according to Figure 1 consists of a box 3, to which a cover 4 with an inlet branch 5 is fixed, which is axially situated with respect to an inner space 9 of the box 3. The box 3 is provided with an outlet branch 6, which is radially situated with respect to the inner space 9 of the box 3. A gland 7 is built in the wall of the box 3 coaxially with the inlet branch 5, in this gland 7 there is rotatingly seated a shaft ~, on the conical end ~1 of which there is wedged a rotor body 21, locked by means of a nut 12. A fixed disc 1 is fixed by means of not -4a-drawned screws to the cover 4. ~ rotating disc 2 is fixed by means of not drawned screws to the rotor body 21.
On the function surface of the fixed disc 1 according to Fi~ure 2 and of the rotating disc 2 according to Figure 3, there are made systems 31, 41, Sl, or 32, 42, 52, of three types of straight grooves 310, 410, 510, or 320, 420, 520, which are graded in width and depth in the direction of flow of the com-pound. The grooves 310, 410, 510, or 320, 420, 520 mutually link up. The first widest and deepest grooves 310 or 320 make together with the radial line 100 or 200 against the sense of rotation of the rotating disc 2 an acute angle ~. The second narrower and flatter grooves 410 or 420 make an angle ~ which is three times bigger than the angle ~. The third narrowest and flattest grooves 510 or 520 are directed against the sense of rotation of the rotating disc 2 and make together with the se-cond narrower and flatter grooves 410 or 420 an angle ~.
The second narrower and -flatter grooves 410 or 420 are at least doubled for each first widest and deepest groove 310 or 320, For each 1 cm of the length of the second narrower and flatter grooves 410 or 420 there exist 1,25 up to 2 third narrow-est and flattest grooves 510 or 520.
On the fixed disc 1 the first widest and deepest grooves 310 are in their beginnings 313 closed and in their ends 314 open, the second narrower and flatter grooves 410 are in their beginnings 413 and ends 314 open, the second narrower and - flatter grooves 410 are in their beginnings 413 and ends 414 open, and the third narrowest and flattest grooves 510 are in their beginnings 513 open and in their ends 514 closed.
On the rotating disc 2 the first widest and deepest grooves 320 are in their beginnings 323 open and in their ends closed, the second narrower and flatter grooves 420 are in their beginnings 423 open and in their ends 424 closed, and the third narrowest and flattest grooves 520 are in their beginnings 523 open and in their ends 524 closed.
The first widest and deepest groove 310 of the fixed disc 1 according to Figure 4 transits in its end 314 into the second narrower and flatter groove 410, and the first widest and deepest groove 320 of the rotating disc 2 transits in its end 324 into the second narrower and flatter groove 420.
Depths 312, 412, 512 of the fixed disc 1 according to Figure 6 and depths 322, 422, 522 of the rotating disc 2 accord-ing to Figure 7 are getting smaller continuously in the direc-tion of the compound flow.
The function or working of the grinding elements is as follows:
The compound comes from the inlet branch 5 into the first widest and deepest grooves 320 of the rotating disc 2 and it flows into the second narrower and flatter grooves 420 of the rotating disc 2 and into the third narrowest and flattest grooves 520, In this way the whole grinding area is filled up. A free flow of the compound and of the rotating disc 2 outside the grinding area is limited by closed ends 324 of the first widest and deepest grooves 320, by the closed ends 424 of the second narrower and flatter grooves 420 and by closed ends 524 of the third narrowest and flattest grooves 520, The compound is forced to flow through the third narrowest and flattest grooves 510 into the second narrower and flatter grooves 410 and into the first widest and deepest grooves 310 of the fixed disc 1, and only then it may flow outside the grinding area. The des-cribed cycle of flow of the compound makes sure, that in fact all fibres are worked in the working process, and in this way a high homogeneity of the compound grinding is ensured.
Simultaneously with a forced compound flow from the system of the first widest and deepest grooves 320, of the se-cond narrower and flatter grooves 52 of the rotating disc 2 into the system of the third narrowest and flattest grooves 51, of the second narrower and flatter grooves 41 and of the first widest and deepest grooves 31 of the fixed disc 1, a limitation of an uneffective pumping input comes in question what causes a considerable decrease of a specific power consumption.
If the compound passes through the third narrowest and flattest grooves 520 of the rotating disc 2, which are in their ends closed, and through the third narrowest and ~lattest grooves 510 of the fixed disc 1, which are closed in their ends, then there the grinding of the compound is relatively thickened, what is caused by the fact, that water and fine components easily go out, and unworked bigger fibres are caught on walls of the third narrowest and flattest grooves 520 of the rotating disc 2 as well as on walls of the third narrowest and flattest grooves 510 of the fixed disc 1 and they are subjected in a thickened condition to grinding.
Although the invention is illustrated and described with reference to two preferred embodiments thereof, it is to be expressly understood that it is in no way limited to the disclosure of such preferred embodiments, but it is capable of numerous modifications within the scope of the appended claims.
For a production of some kinds of paper and cardboard, as e.g. imitation parchment, tracing paper, deep-drawing trunk cardboard, etc., it is necessary during the grinding process to ensure a perfect fibrillation of fibres and outlet homogeneity of the compound grinding. For these purposes there are known grinding mills, the grinding elements of which are made of a porous basalt-lava. But their disadvantage resides in a low service life, high costs and difficulties in obtaining suitable raw material. Efforts to replace basalt-lava grinding elements by relatively cheap steel grinding elements of a high service life provide many problems. Requirement for a perfect fibrilla- -tion of fibres causes an increase of a non-effective pumping in-put as well as an increase of a specific power consumption.
So. e.g. for a production of an imitation parchment, the compound is ground for 84 - 87~ SR and a specific consumption of power for grinding reaches in a basalt-lava pulp engine 550 -700 XWh/t, and as to disc mills and conical ones, provided withsteel grinding elements, their specific power consumption is in the range 750 up to 950 kWh/t. Another disadvantage of hitherto known grinding mills provided with steel milling elements re-sides in the fact that the quality of the compound only approach-es to technological requirements as to the homogeneity in a per-fection of a fibre fibrillation.
The aim of the invention is to solve a design of steel grinding elements of grinding mills for a producticn of special kinds of paper and cardboard, which may replace basalt-lava grinding elements and which may obviate disadvantages of the hitherto known grinding elements.
This problem i5 solved by the invention of grinding ~6~t,~
elements of grinding mills, especially for a production of spe-cial kinds of paper and cardboard, consisting of at least of one fixed disc and of one rotating disc, the function surfaces of which -let they be plane or conical -are provided with systems of grooves, having various depth and width. The principle of the invention resides in the fact, that on function surfaces of the discs there are made systems of three types of ,traight grooves ~eing graded in width and depth and mutually linking up, of which the first widest and deepest grooves make together with a radial l.ine against the sense of rotation of a rotating disc an angle ~ in a range 10 up to 20, the second narrower and flatter grooves make with a radial line against the sense of rotation an angle ~ = 3~, the third narrowest and flattest grooves are directed against the sense of rotation of the rotating disc and they make together with the second narrower and flatter grooves and angle ~ in the range 80 up to 100, the number of the second narrower and flatter grooves is for each first and deepest groove at least doubled, and :Eor each cm of length of the second narrower and flatter groove there exist 1,25 up to 2 20 third narrowest and flattest grooves, the heginnings of the first widest and deepest grooves of the fixed disc are closed and the ends of them are open, the beginnings of the first widest and - deepest grooves of the rotating disc are open and the ends of them are closed, the second narrower and flatter grooves are open at the outer circumference of the fixed disc and they are . closed at the outer circumference of the rotating disc, the ends of the third narrowest and flattest grooves are closed.
The principle of the invention also resides in the fact that the widest and deepest grooves transit in their ends into the second narrower and flatter grooves.
The principle of the invention also resides in the fact, that the angle ~, which is made by the first widest and deepest grooves together with the radial line, is 15, that the angle ~, which is made by the second narrower and flatter grooves together with the radial line, is 45, and that the angle ~, which is made by the third narrowest and flattest grooves together with the second narrower and flatter grooves, is 90.
The principle of the invention also resides in the fact that the widths of the mutually corresponding grooves of the fixed disc and of the rotating one are identicalD
The principle of the invention also resides in the fact that the depths of the mutually corresponding grooves of the fixed disc and of the rotating one are identical.
An intensive fibrillation of fibres having a completely comparable character with the work of basalt-lava grinding ele-ments is a result of the described mechanism.
The advantage of the grinding elements according to the invention resides in the fact that they may be manufactured by an ordinary working process and made of steels resistent against wear and tear, what ensures their long service life and low price.
Tests that were carried out with grinding elements according to the invention proved, that they are completely com-parable with basalt-lava grinding elements as to the fibrilla-tion of cellulose, and more over their service life is longer and the specific consumption is lower than those ones of the basalt-lava grinding elements. So e.g. at grinding for imitation parchment the specific power consumption was in the range 510 -550 kWh/t.
The tests also showed that grinding elements according to the invention will be advantageous not only for special ~ine-ground paper as e.g~ imitation parchment, tracing paper etc., but they may he applied in a production of strong paper if there is required to increase mechanical properties already at a low 11.~6~3 stage of grinding. Another application area is a finish grind-ing of old paper, when it is required to renew the plasticity and weave ability of fibres of a limited shortened effect.
In one aspect of the present invention there is pro-vided grinding elements for a grinding mill, especially for the production of special kinds of paper and cardboard, comprising at least one fixed disc and one rotating disc, the working sur-faces of the said discs being in a plane or of conical shape and provided with groups of grooves of various widths and depths, further comprising that on the working surfaces of the discs there are provided spaced groups of three types of straight grooves each being of varying width and depth and mutually link~
ing up, one with another, of which, respective a group, the first widest and deepest groove is inclined against the sense of rotation of a rotating disc, making together with a radial line an angle ~ having a range 10 to 20, the second narrower and flatter groove is inclined against the sense of rotation, making together with a radial line an angle ~ = 3~, the third narrow-est and flattest groove is also directed against the sense of rotation of the rotating disc and makes together with the second narrower and flatter groove an angle ~ having a range ~30 to 100, there are at least two second narrower and flatter groove extending from each first widest and deepest groove and for each 1 cm of length of the second narrower and flatter groove there are spaced 1.25 to 2 third narrowest and flattest grooves, the beginnings of the first widest and deepest grooves of the fixed disc are closed and the ends of them are open at the outer circumference of the disc, the beginnings of the first widest and deepest grooves of the rotating disc are open and the ends of them are closed adjacent the outer circumference of the disc, the second narrower and flatter grooves are open at the outer circumference of the fixed disc and they are ~llf~ t~
closed at the outer circumference of the rotating disc, and the ends of the third narrowest and flattest grooves are closed on both discs.
In order that the invention may be clearly understood and readily carried into effect, two preferred embodiments thereof are, by way of example, hereinafter more fully described and illustrated in the accompanying drawings, in which:
Embodiment 1 Figure 1 shows a section of a working part of a grind-ing mill, Figure 2 shows a detail of a working surface of a fixed disc, Figure 3 shows a detail of a working surface of a rotating disk;
Figure 6 shows a section of a fixed disc according to Figure 2, Figure 7 shows a section of a rotating disc according to Figure 2, Embodiment 2 Figure 4 shows a detail of a working surface of a function surface of a fixed disc, - Figure 5 shows a detail of a working surface of a : rotating disc.
A device according to Figure 1 consists of a box 3, to which a cover 4 with an inlet branch 5 is fixed, which is axially situated with respect to an inner space 9 of the box 3. The box 3 is provided with an outlet branch 6, which is radially situated with respect to the inner space 9 of the box 3. A gland 7 is built in the wall of the box 3 coaxially with the inlet branch 5, in this gland 7 there is rotatingly seated a shaft ~, on the conical end ~1 of which there is wedged a rotor body 21, locked by means of a nut 12. A fixed disc 1 is fixed by means of not -4a-drawned screws to the cover 4. ~ rotating disc 2 is fixed by means of not drawned screws to the rotor body 21.
On the function surface of the fixed disc 1 according to Fi~ure 2 and of the rotating disc 2 according to Figure 3, there are made systems 31, 41, Sl, or 32, 42, 52, of three types of straight grooves 310, 410, 510, or 320, 420, 520, which are graded in width and depth in the direction of flow of the com-pound. The grooves 310, 410, 510, or 320, 420, 520 mutually link up. The first widest and deepest grooves 310 or 320 make together with the radial line 100 or 200 against the sense of rotation of the rotating disc 2 an acute angle ~. The second narrower and flatter grooves 410 or 420 make an angle ~ which is three times bigger than the angle ~. The third narrowest and flattest grooves 510 or 520 are directed against the sense of rotation of the rotating disc 2 and make together with the se-cond narrower and flatter grooves 410 or 420 an angle ~.
The second narrower and -flatter grooves 410 or 420 are at least doubled for each first widest and deepest groove 310 or 320, For each 1 cm of the length of the second narrower and flatter grooves 410 or 420 there exist 1,25 up to 2 third narrow-est and flattest grooves 510 or 520.
On the fixed disc 1 the first widest and deepest grooves 310 are in their beginnings 313 closed and in their ends 314 open, the second narrower and flatter grooves 410 are in their beginnings 413 and ends 314 open, the second narrower and - flatter grooves 410 are in their beginnings 413 and ends 414 open, and the third narrowest and flattest grooves 510 are in their beginnings 513 open and in their ends 514 closed.
On the rotating disc 2 the first widest and deepest grooves 320 are in their beginnings 323 open and in their ends closed, the second narrower and flatter grooves 420 are in their beginnings 423 open and in their ends 424 closed, and the third narrowest and flattest grooves 520 are in their beginnings 523 open and in their ends 524 closed.
The first widest and deepest groove 310 of the fixed disc 1 according to Figure 4 transits in its end 314 into the second narrower and flatter groove 410, and the first widest and deepest groove 320 of the rotating disc 2 transits in its end 324 into the second narrower and flatter groove 420.
Depths 312, 412, 512 of the fixed disc 1 according to Figure 6 and depths 322, 422, 522 of the rotating disc 2 accord-ing to Figure 7 are getting smaller continuously in the direc-tion of the compound flow.
The function or working of the grinding elements is as follows:
The compound comes from the inlet branch 5 into the first widest and deepest grooves 320 of the rotating disc 2 and it flows into the second narrower and flatter grooves 420 of the rotating disc 2 and into the third narrowest and flattest grooves 520, In this way the whole grinding area is filled up. A free flow of the compound and of the rotating disc 2 outside the grinding area is limited by closed ends 324 of the first widest and deepest grooves 320, by the closed ends 424 of the second narrower and flatter grooves 420 and by closed ends 524 of the third narrowest and flattest grooves 520, The compound is forced to flow through the third narrowest and flattest grooves 510 into the second narrower and flatter grooves 410 and into the first widest and deepest grooves 310 of the fixed disc 1, and only then it may flow outside the grinding area. The des-cribed cycle of flow of the compound makes sure, that in fact all fibres are worked in the working process, and in this way a high homogeneity of the compound grinding is ensured.
Simultaneously with a forced compound flow from the system of the first widest and deepest grooves 320, of the se-cond narrower and flatter grooves 52 of the rotating disc 2 into the system of the third narrowest and flattest grooves 51, of the second narrower and flatter grooves 41 and of the first widest and deepest grooves 31 of the fixed disc 1, a limitation of an uneffective pumping input comes in question what causes a considerable decrease of a specific power consumption.
If the compound passes through the third narrowest and flattest grooves 520 of the rotating disc 2, which are in their ends closed, and through the third narrowest and ~lattest grooves 510 of the fixed disc 1, which are closed in their ends, then there the grinding of the compound is relatively thickened, what is caused by the fact, that water and fine components easily go out, and unworked bigger fibres are caught on walls of the third narrowest and flattest grooves 520 of the rotating disc 2 as well as on walls of the third narrowest and flattest grooves 510 of the fixed disc 1 and they are subjected in a thickened condition to grinding.
Although the invention is illustrated and described with reference to two preferred embodiments thereof, it is to be expressly understood that it is in no way limited to the disclosure of such preferred embodiments, but it is capable of numerous modifications within the scope of the appended claims.
Claims (8)
1. Grinding elements for a grinding mill, especially for the production of special kinds of paper and cardboard, comprising at least one fixed disc and one rotating disc, the working surfaces of the said discs being in a plane or of conical shape and provided with groups of grooves of various widths and depths, further comprising that on the working surfaces of the discs there are provided spaced groups of three types of straight grooves each being of varying width and depth and mutually linking up, one with another, of which, respective a group, the first widest and deepest groove is inclined against the sense of rotation of a rotating disc, making together with a radial line an angle ? having a range 10° to 20°, the second narrower and flatter groove is inclined against the sense of rotation, making together with a radial line an angle .beta. = 3?, the third narrowest and flattest groove is also directed against the sense of rotation of the rotating disc and makes together with the second narrower and flatter groove an angle ? having a range 80° to 100°, there are at least two second narrower and flatter groove extending from each first widest and deep-est groove and for each 1 cm of length of the second narrow-er and flatter groove there are spaced 1.25 to 2 third narrow-est and flattest grooves, the beginnings of the first widest and deepest grooves of the fixed disc are closed and the ends of them are open at the outer circumference of the disc, the beginnings of the first widest and deepest grooves of the rotating disc are open and the ends of them are closed ad-jacent the outer circumference of the disc, the second narrower and flatter grooves are open at the outer circum-ference of the fixed disc and they are closed at the outer circumference of the rotating disc, and the ends of the third narrowest and flattest grooves are closed on both discs.
2. Grinding elements as in claim 1, wherein the outer circumference terminal ends of the first widest and deepest grooves of both discs are closed and adjoin a second narrower and flatter groove.
3. Grinding elements as in claim 1, wherein the angle ?, which is made by the first widest and deepest grooves together with the radial line, is 15°, the angle .beta., which is made by the second narrower and flatter grooves together with the radial line, is 45°, and the angle ? , which is made by the third narrowest and flattest grooves together with the second narrower and flatter grooves, is 90°.
4. Grinding elements as in claim 2, wherein the angle ?, which is made by the first widest and deepest grooves together with the radial line, is 15°, the angle .beta., which is made by the second narrower and flatter grooves together with the radial line, is 45°, and the angle ? , which is made by the third narrowest and flattest grooves together with the second narrower and flatter grooves, is 90°.
5. Grinding elements as in claims 1, 2 or 3, wherein widths of the mutually corresponding grooves of the fixed disc and rotating one are identical.
6. Grinding elements as in claim 4, wherein widths of the mutually corresponding grooves of the fixed disc and rotating one are identical.
7. Grinding elements as in claims 1, 2 or 3 wherein depths of the mutually corresponding grooves of the fixed disc and rotating one are identical.
8. Grinding elements as in claim 4, wherein depths of the mutually corresponding grooves of the fixed disc and rotating one are identical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CSPV7252-78 | 1978-11-07 | ||
| CS725278A CS203540B1 (en) | 1978-11-07 | 1978-11-07 | Milling elements for milling machines,especially for manufacturing specific paper and paperboard types |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116453A true CA1116453A (en) | 1982-01-19 |
Family
ID=5421343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000337881A Expired CA1116453A (en) | 1978-11-07 | 1979-10-18 | Grinding elements of a grinding mill, especially for a production of special kinds of papers and cardboard |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT374840B (en) |
| CA (1) | CA1116453A (en) |
| CS (1) | CS203540B1 (en) |
| DD (1) | DD156129A3 (en) |
| DE (1) | DE2944795A1 (en) |
| FI (1) | FI65101C (en) |
| SE (1) | SE432062B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828432A (en) * | 2012-08-13 | 2012-12-19 | 李�昊 | Batch refiner and refining process thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202004003743U1 (en) * | 2004-03-10 | 2004-05-19 | Voith Paper Patent Gmbh | Grinder and grinding set for paper pulp |
| CN104492541A (en) * | 2014-12-24 | 2015-04-08 | 泰州奥莱佳生活用品有限公司 | Five-stage grinding system with fiber cutting function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR734917A (en) * | 1932-04-09 | 1932-10-31 | Crusher and grinder plate for coffee grinders or others | |
| GB1556925A (en) * | 1977-06-16 | 1979-12-05 | Vyzk Ustav Papieru Celulozy | Apparatus for the treatment of fibrous suspension by knifeaction |
-
1978
- 1978-11-07 CS CS725278A patent/CS203540B1/en unknown
-
1979
- 1979-10-18 CA CA000337881A patent/CA1116453A/en not_active Expired
- 1979-10-24 FI FI793314A patent/FI65101C/en not_active IP Right Cessation
- 1979-10-26 DD DD21653479A patent/DD156129A3/en not_active IP Right Cessation
- 1979-10-29 AT AT696979A patent/AT374840B/en not_active IP Right Cessation
- 1979-11-05 SE SE7909140A patent/SE432062B/en not_active IP Right Cessation
- 1979-11-06 DE DE19792944795 patent/DE2944795A1/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828432A (en) * | 2012-08-13 | 2012-12-19 | 李�昊 | Batch refiner and refining process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AT374840B (en) | 1984-06-12 |
| DE2944795A1 (en) | 1980-05-14 |
| SE7909140L (en) | 1980-05-08 |
| FI793314A (en) | 1980-05-08 |
| FI65101C (en) | 1984-03-12 |
| SE432062B (en) | 1984-03-19 |
| DE2944795C2 (en) | 1988-03-31 |
| ATA696979A (en) | 1983-10-15 |
| DD156129A3 (en) | 1982-08-04 |
| FI65101B (en) | 1983-11-30 |
| CS203540B1 (en) | 1981-03-31 |
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