CA1118332A - Multilayer felt band - Google Patents
Multilayer felt bandInfo
- Publication number
- CA1118332A CA1118332A CA000371220A CA371220A CA1118332A CA 1118332 A CA1118332 A CA 1118332A CA 000371220 A CA000371220 A CA 000371220A CA 371220 A CA371220 A CA 371220A CA 1118332 A CA1118332 A CA 1118332A
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- CA
- Canada
- Prior art keywords
- felt band
- felt
- layer
- storage spaces
- band
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE
An arrangement for manufacturing a multilayer felt band comprising fibers of thermoplastic material, with storage spaces of the shape of channels in at least one layer of the felt band. The arrangement comprises at least two rotating rolls adapted for guiding and connecting individual layers, at least one of the rolls being provided with a hollow mantle having openings therein, a reflecting mirror situated inside the mantle and adapted to be displaced within the mantle, and a quantum generator of light radiation situated near the face of the roll.
An arrangement for manufacturing a multilayer felt band comprising fibers of thermoplastic material, with storage spaces of the shape of channels in at least one layer of the felt band. The arrangement comprises at least two rotating rolls adapted for guiding and connecting individual layers, at least one of the rolls being provided with a hollow mantle having openings therein, a reflecting mirror situated inside the mantle and adapted to be displaced within the mantle, and a quantum generator of light radiation situated near the face of the roll.
Description
'111~333Z
This invention relates to a multilayer felt band.
More particularly, this invention relates to felt bands and par-ticularly felt bands which are used in the paper-making industry.
The development of these types of felt bands was carr d out in recent years at first by using natural fibers with an in-creasing utilization of synthetic fibers. The use of these fi-bers enabled the development of new technological processes, for instance the technology of needling. The melting together of thermoplastic fibers also belongs to these novel technological processes. In particular, the new synthetic materials brought resistivity to abrasion, against the influences of different chemicals, moulds and the like. These materials found their ap-plication particularly in the manufacture of felt band. In paper making, these felt bands are useful for dewatering, dehumidifying and drying. These materials are also useful for the manufacture of filtering and insulating materials and the like. In case of felt bands which are useful in the paper manufacture, those of particular interest are needled felt bands which are character-ized by an internal structure where the supporting tissue or net-ting is connected with a needled fleece made of unfeltable fibers.
In this case, the supporting tissue serves as suppor-ting medium and as means for achieving the required strength and dimension stability, whereby the loops of the supporting tissue can serve as storage spaces for the working medium, for instance water. However, on the point of view of certain required proper-ties this support is not satisfactory. New types of felt bands have therefore been developed which have few or no wefts. Re-cently, there were produced felt bands having practically no sup-porting tissue and having a layer derived from a fiber fleece which is reinforced by needling. The dimension stability and re-quired strength of these materials is obtained both by intensive needling and chemical impregnation or melting together. Needling ~18332 forms bonds in a fleece of unfeltable fibers, thus providing strength to the fleece and connecting the individual layers of the fiber fleeces together. The chemical impregnation of the felt band also improves the necessary strength and dimension stability. The internal bonds between thermoplastic fibers can also be produced by melting the materials together in order to strengthen the structure of the felt band. These felt bands are spatially arranged so that the fibers are oriented in the plane of the surface of the felt band and the bonds are oriented in a direction substantially perpen-dicular to this plane. In case of a chemical working of the felt band, bonds are produced in the whole structure of the felt band by bonding the fibers of the fleece with some synthetic resin. These methods of making felt bands are disadvantageous because no storage spaces for the working medium are provided and furthermore they influence some of the required properties such as perviousness, strength, elasticity, clogging and the like.
It is an object of this invention to eliminate these drawbacks and to provide a felt band, which has sufficient strength, elasticity, perviousness and capability to absorb humidity.
The invention relates to a multilayer felt band comprising fibers of thermoplastic material, at least one layer thereof having storage spaces of the shape of channels defined by fused fibers, the walls of said channels in at least one layer being oriented with respect to the major surfaces of the felt band at an angle between 0 and 80.
It is another object of this invention to provide a multilayer felt band comprising thermoplastic material in the form of individual fibers as described above, where at least one layer has channels with a trapezoidal cross-section.
~11t333~:
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising fibers wherein at least a portion thereof comprises thermo-plast:ic material, by forming storage spaces of the shape of channels in at least one layer of the felt band, the walls of said channels in said at least one layer being oriented at an angle between zero and 80 with respect to the surface of the felt band, said storage spaces being formed by melting out by radiation generated by a quantum generator of light radiation acting on a layer of the felt band taken along on a rotating roll, whereby the radiation beam is inclined with respect to a tangent to the surface of the rotating roll, at the place the radiating beam strikes the roll, at an angle between zero and 90.
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising fibers of thermoplastic material, fiber layers of thermoplastic material, fibers impregnated with thermoplastic material or in-dividual fibers coated with thermoplastic material as described, wherein channel-shaped storage spaces are molten out in at least one layer of the felt band by a radiation beam generated by a light radiation quantum generator acting within a region of a contact line where layers of the felt band are connected together.
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising in-dividual fibers of thermoplastic material, fiber layers of thermoplastic material, fibers impregnated with thermoplastic material or individual fibers coated with thermoplastic mater-ial as described, wherein channel-shaped storage spaces are molten out in individual layers of the felt band by a radiat-ion beam generated with a light radiation quantum generator 3æ
having a different diameter than the radiation beam.
Finally, it is another object of this invention to provide an arrangement for manufacturing a multilayer felt band comprising fibers of thermoplastic material, with storage spaces of the shape of channels in at least one layer of the felt band, comprising at least two rotating rolls adapted for guiding and connecting individual layers, at least one of said rolls being provided with a hollow mantle having openings therein, a reflecting mirror situated inside said mantle and adapted to be displaced within said mantle, and a quantum generator of light radiation situated near the face of said roll.
In accordance with an embodiment of this invention, the channel-shaped storage spaces of the individual layers can be interconnected, i.e. they may be mutually joined thus creat-ing in the felt band a continuous system of storage spaces to promote dewatering. Channels of trapeze-shaped cross-section conically widen toward the lower surface of the felt band. A
thus made felt band can be very advantageously used where large amounts of water have to be removed. However, this invention also includes a felt band, where storage spaces formed in in-dividual layers of the felt band create a separate system i.e.
they are not interconnected with storage spaces of adjacent layers. Such a felt band prevents a back-sucking of water into the paper and is particularly advantageous when used on the second and third press of a paper-making machine and generally for slow operating paper-making machines.
The channel-shaped storage spaces according to this in-vention are molten out in individual layers of the felt band by radiation beams generated by a light radiation quantum generator acting at a certain angle on the layer of the felt band. The melting out of storage spaces thereby takes place when the layer of the felt band is taken along by a rotating roll, possibly near the contact line between both rolls. Thus the melting out of the 33~
storage spaces is carried out under dynamic conditions, while compressing and extending the layer of the felt band and when joining the layers. The rolls are advantageously heated. This process produces strong and elastic bonds between fibers at the place where they melt together, to form a stronger and more elas-tic connection between the layers, thus producing a felt band ha-ving higher strength and dimension stability. By selecting the distance between the location where the radiation beam acts on the layer of the felt band, and the connecting line, it is possi-ble to influence, to a certain degree, the density of the struc-ture of the wall of the storage space and thus the capacity of water absorption by the felt band.
One or more light radiation quantum generators (lasers) can be used for forming the storage spaces in the felt band. The quantum generators can radiate in the region of the connection line of connected layers either directly or through some layer.
The number, situation and shape of the storage spaces is deter-mined by the position and relative movement of a layer or layers of the felt band respectively and of corresponding parts of the light radiation quantum generatcr. These conditions are also controlled by a continuous or intermittent operation of the quan-tum generator and by the use of rasters and diaphragms. The dia-meter of the radiation beam can be adjusted by focussing.
In addition to the already mentioned advantages, the invention also solves the problem of suitably oriented storage spaces for the working medium in the felt band, thereby substan-tially improving the efficiency of the felt band. In addition to a higher elasticity and strength, the felt band according to the invention will also have better dimension stability, it will be less clo~ged and in its application there will be a substantially lower humidifying of the paper.
The method and apparatus for making felt bands accord-ing to this invention is illustrated in the annexed drawings,which are not for restricting purposes and in which, Figure 1 is a cross-section view of a felt band having two layers, Figure 2 a side view showing the connection of both layers and the formation of storage spaces, Figure 3 is a cross-section view of a felt band having four layers, Figure 4 is a corresponding side view showing the con-nection and formation of storage spaces in the felt band illus-trated in Figure 3, Figure 5 is a cross-section view of a felt band having two layers, Figure 6 is a corresponding axonometric view again showing the arrangement of storage spaces in the felt band illus-trated in Figure 5, Figure 7 is a cross-section view of a felt band having three layers, Figure 8 is a corresponding side view showing the con-nection and forming of storage spaces in the felt band illustra-ted in Figure 7, Figure 9 is a cross-section view of a two layer felt band, and Figure 10 is a side view showing the formation of the felt band illustrated in Figure 9.
The felt band illustrated in Figures 1 and 2 has an upper layer 8a which faces the paper and a lower layer 8b. Both layers a~e made of a mixture of polyester and polyamide fibers in a ratio of 1:2. The individual layers 8a,8b were made on a card-ing machine and strengthened by needling. The lower layer 8b ofthe felt band has storage spaces 9 in the shape of channels which are oriented at an angle 30 towards the surface of the ~æ
felt band. The channels are slanted towards a direction which is parallel to the longitudinal axis of the felt band and extend from the surface of the lower layer toward the center of the band in the direction of movement of the felt band. The channels have been molten out in the lower layer 8b of the felt band by a radiation generated by a light radiation quantum generator 1, situated in front of the connecting line 7 of the connected lay-ers 8a,8b of the felt band in such a manner that the radiation beam impinges on the layer 8b of the felt band at an angle of 30. The beam acts on the moving layer 8b of the felt band through a rotating diaphragm 6 which causes the beam to simul-taneously perform a transverse movement across the width of the felt band. The felt band described is particularly suitable to be applied on presses with full rolls.
The multilayer felt band according to Figures 3 and 4 is made of four layers 8a,8b,8c,8d. All the layers are made of a mixture of polyester and polyamide fibers in a ratio of 1:4.
The storage spaces 9 in the shape of channels which are oriented at an angle 45 towards the surface of the felt band, are located in both middle layers 8c,8d of the felt band in such a manner that the channels of one layer are at an angle of 90 with re-spect to the channels of the other layer. Both the first layers 8a,8c are strengthened by needling and are connected at the con-necting line 7 with the other two layers 8d,8b which have also been previously strengthened by needling. In the zone of the connecting line 7, theradiation generated by two quantum genera-tors la,lb (Figure 4) situated in front of the connecting line 7 acts on the layers through a rotating diaphragm 6 in such a man-ner that the radiation beams generated by both generators cross one another, The multilayer felt band according to Figures 5 and 6 is made of an upper layer 8a and a lower layer 8b. Both layers 33;i~2 are made of polyamide fibers. The lower layer 8b represents a-bout one third of the thickness of the felt band. The indivi-dual layers of the felt band are made on a carding machine and have previously been strengthened by needling. At the boundary between the upper layer 8a and the lower layer 8b, there are pro-vided storage spaces 9 in the shape of channels which are paral-lel to the axis of the felt band in the longitudinal direction thereof to form parallel rows, whereby the channels of each row are mutually separated by gaps.
The multilayer felt band according to Figures 7 and 8 is made of three layers 8a,8b,8c. Each layer contains a mixture of polyester and polyamide fibers in the ratio of 1:3 and is strengthened by needling. The upper layer 8a is provided with storage spaces 9 in the shape of channels which are oriented at an angle of 60 towards the surface of the layer. Each channel extends from the surface to the center of the felt band in the direction of movement of the felt band in the paper making ma-chine. The middle layer 8c of the felt band is provided with storage spaces 9 in the shape of channels which are perpendicu-lar to the surface of the layer. The lower layer 8b is provided with storage spaces 9 in the shape of channels which are orien-ted at an angle of 10 towards the surface of the layer. Each channel extends from the opposite surface to the center of the felt band against the direction of movement of the felt band in the paper making machine. The direction of movement of the felt band is indicated by an arrow in the drawing. The channels of the individual layers 8a, 8c, 8b have different diameters, in a ratio of 1 : 2 : 4 from the upper layer 8a to the lower layer 8b.
The felt band is made o individual layers by guiding the upper layer 8a and the middle layer 8c toward the connecting line 7 between two rolls 5a,5b. Two light radiation generators la,lb are mounted in frontof the connecting line 7a. The beam gene-~8~æ
rated by generator la is at an angle of 60 with respect to thesurface of the upper layer 8a and the beam generated by genera-tor lb is at an angle of 90 with respect to the middle layer 8c.
The lower layer 8b of the felt band is joined with the layers 8a and 8c at the connecting line 7b and the generator lc located above this layer directs its radiation beam in the region of the connecting line 7b, said radiation beam being at an angle of 10 towards the lower layer 8b. The radiation beams generated by generators la,lb,lc pass through rotating diaphragms 6a,6b,6c and each quantum generator enables a movement of the beam along the whole width of the felt band. The felt band made in this manner is particularly suitable for removing large amounts of water.
The multilayer felt band according to Figures 9 and 10 is made of two layers 8a and 8b. Both layers consist of poly-amide fibers. The lower layer 8b is provided with storage spaces 9 in the shape of channels with trapezoid cross-section, its axis being perpendicular to the surface of the felt band. The upper layer 8a and the lower layer 8b are interconnected by storage spaces 9 in the shape of channels which are perpendicular to the surface of the felt band.
The channels 9 in the lower layer 8b are conically shaped, with their walls being at an angle which is different from 90 with respect to the surface of the felt band. These channels have been made under dynamic conditions at the connecting line 7, thus securing stable elastic walls thereof. The connecting line 7 is determined by two rolls 3a,3b provided with mantle openings 4a,4b. A reflecting mirror 2a is situated inside the roll 3a and a reflecting mirror 2b is inside the roll 3b. The storage spaces 9 have been molten out in the lower layer 8b under dyna-mic conditions, by a light radiation quantum generator lb whichis located near the roll 3b, The radiation of generator lb passes through a diaphragm 6b. The channel-~haped storage spaces 9 interconnecting the upper layer 8a and the lower layer 8b have been molten out at the connecting line 7 by the radiation gene-ratecl by the quantum generator la located in the roll 3a through a rotating diaphragm 6b.
This is a division of application No. 303,607, filed on May 18, 1978.
This invention relates to a multilayer felt band.
More particularly, this invention relates to felt bands and par-ticularly felt bands which are used in the paper-making industry.
The development of these types of felt bands was carr d out in recent years at first by using natural fibers with an in-creasing utilization of synthetic fibers. The use of these fi-bers enabled the development of new technological processes, for instance the technology of needling. The melting together of thermoplastic fibers also belongs to these novel technological processes. In particular, the new synthetic materials brought resistivity to abrasion, against the influences of different chemicals, moulds and the like. These materials found their ap-plication particularly in the manufacture of felt band. In paper making, these felt bands are useful for dewatering, dehumidifying and drying. These materials are also useful for the manufacture of filtering and insulating materials and the like. In case of felt bands which are useful in the paper manufacture, those of particular interest are needled felt bands which are character-ized by an internal structure where the supporting tissue or net-ting is connected with a needled fleece made of unfeltable fibers.
In this case, the supporting tissue serves as suppor-ting medium and as means for achieving the required strength and dimension stability, whereby the loops of the supporting tissue can serve as storage spaces for the working medium, for instance water. However, on the point of view of certain required proper-ties this support is not satisfactory. New types of felt bands have therefore been developed which have few or no wefts. Re-cently, there were produced felt bands having practically no sup-porting tissue and having a layer derived from a fiber fleece which is reinforced by needling. The dimension stability and re-quired strength of these materials is obtained both by intensive needling and chemical impregnation or melting together. Needling ~18332 forms bonds in a fleece of unfeltable fibers, thus providing strength to the fleece and connecting the individual layers of the fiber fleeces together. The chemical impregnation of the felt band also improves the necessary strength and dimension stability. The internal bonds between thermoplastic fibers can also be produced by melting the materials together in order to strengthen the structure of the felt band. These felt bands are spatially arranged so that the fibers are oriented in the plane of the surface of the felt band and the bonds are oriented in a direction substantially perpen-dicular to this plane. In case of a chemical working of the felt band, bonds are produced in the whole structure of the felt band by bonding the fibers of the fleece with some synthetic resin. These methods of making felt bands are disadvantageous because no storage spaces for the working medium are provided and furthermore they influence some of the required properties such as perviousness, strength, elasticity, clogging and the like.
It is an object of this invention to eliminate these drawbacks and to provide a felt band, which has sufficient strength, elasticity, perviousness and capability to absorb humidity.
The invention relates to a multilayer felt band comprising fibers of thermoplastic material, at least one layer thereof having storage spaces of the shape of channels defined by fused fibers, the walls of said channels in at least one layer being oriented with respect to the major surfaces of the felt band at an angle between 0 and 80.
It is another object of this invention to provide a multilayer felt band comprising thermoplastic material in the form of individual fibers as described above, where at least one layer has channels with a trapezoidal cross-section.
~11t333~:
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising fibers wherein at least a portion thereof comprises thermo-plast:ic material, by forming storage spaces of the shape of channels in at least one layer of the felt band, the walls of said channels in said at least one layer being oriented at an angle between zero and 80 with respect to the surface of the felt band, said storage spaces being formed by melting out by radiation generated by a quantum generator of light radiation acting on a layer of the felt band taken along on a rotating roll, whereby the radiation beam is inclined with respect to a tangent to the surface of the rotating roll, at the place the radiating beam strikes the roll, at an angle between zero and 90.
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising fibers of thermoplastic material, fiber layers of thermoplastic material, fibers impregnated with thermoplastic material or in-dividual fibers coated with thermoplastic material as described, wherein channel-shaped storage spaces are molten out in at least one layer of the felt band by a radiation beam generated by a light radiation quantum generator acting within a region of a contact line where layers of the felt band are connected together.
It is another object of this invention to provide a method of manufacturing a multilayer felt band comprising in-dividual fibers of thermoplastic material, fiber layers of thermoplastic material, fibers impregnated with thermoplastic material or individual fibers coated with thermoplastic mater-ial as described, wherein channel-shaped storage spaces are molten out in individual layers of the felt band by a radiat-ion beam generated with a light radiation quantum generator 3æ
having a different diameter than the radiation beam.
Finally, it is another object of this invention to provide an arrangement for manufacturing a multilayer felt band comprising fibers of thermoplastic material, with storage spaces of the shape of channels in at least one layer of the felt band, comprising at least two rotating rolls adapted for guiding and connecting individual layers, at least one of said rolls being provided with a hollow mantle having openings therein, a reflecting mirror situated inside said mantle and adapted to be displaced within said mantle, and a quantum generator of light radiation situated near the face of said roll.
In accordance with an embodiment of this invention, the channel-shaped storage spaces of the individual layers can be interconnected, i.e. they may be mutually joined thus creat-ing in the felt band a continuous system of storage spaces to promote dewatering. Channels of trapeze-shaped cross-section conically widen toward the lower surface of the felt band. A
thus made felt band can be very advantageously used where large amounts of water have to be removed. However, this invention also includes a felt band, where storage spaces formed in in-dividual layers of the felt band create a separate system i.e.
they are not interconnected with storage spaces of adjacent layers. Such a felt band prevents a back-sucking of water into the paper and is particularly advantageous when used on the second and third press of a paper-making machine and generally for slow operating paper-making machines.
The channel-shaped storage spaces according to this in-vention are molten out in individual layers of the felt band by radiation beams generated by a light radiation quantum generator acting at a certain angle on the layer of the felt band. The melting out of storage spaces thereby takes place when the layer of the felt band is taken along by a rotating roll, possibly near the contact line between both rolls. Thus the melting out of the 33~
storage spaces is carried out under dynamic conditions, while compressing and extending the layer of the felt band and when joining the layers. The rolls are advantageously heated. This process produces strong and elastic bonds between fibers at the place where they melt together, to form a stronger and more elas-tic connection between the layers, thus producing a felt band ha-ving higher strength and dimension stability. By selecting the distance between the location where the radiation beam acts on the layer of the felt band, and the connecting line, it is possi-ble to influence, to a certain degree, the density of the struc-ture of the wall of the storage space and thus the capacity of water absorption by the felt band.
One or more light radiation quantum generators (lasers) can be used for forming the storage spaces in the felt band. The quantum generators can radiate in the region of the connection line of connected layers either directly or through some layer.
The number, situation and shape of the storage spaces is deter-mined by the position and relative movement of a layer or layers of the felt band respectively and of corresponding parts of the light radiation quantum generatcr. These conditions are also controlled by a continuous or intermittent operation of the quan-tum generator and by the use of rasters and diaphragms. The dia-meter of the radiation beam can be adjusted by focussing.
In addition to the already mentioned advantages, the invention also solves the problem of suitably oriented storage spaces for the working medium in the felt band, thereby substan-tially improving the efficiency of the felt band. In addition to a higher elasticity and strength, the felt band according to the invention will also have better dimension stability, it will be less clo~ged and in its application there will be a substantially lower humidifying of the paper.
The method and apparatus for making felt bands accord-ing to this invention is illustrated in the annexed drawings,which are not for restricting purposes and in which, Figure 1 is a cross-section view of a felt band having two layers, Figure 2 a side view showing the connection of both layers and the formation of storage spaces, Figure 3 is a cross-section view of a felt band having four layers, Figure 4 is a corresponding side view showing the con-nection and formation of storage spaces in the felt band illus-trated in Figure 3, Figure 5 is a cross-section view of a felt band having two layers, Figure 6 is a corresponding axonometric view again showing the arrangement of storage spaces in the felt band illus-trated in Figure 5, Figure 7 is a cross-section view of a felt band having three layers, Figure 8 is a corresponding side view showing the con-nection and forming of storage spaces in the felt band illustra-ted in Figure 7, Figure 9 is a cross-section view of a two layer felt band, and Figure 10 is a side view showing the formation of the felt band illustrated in Figure 9.
The felt band illustrated in Figures 1 and 2 has an upper layer 8a which faces the paper and a lower layer 8b. Both layers a~e made of a mixture of polyester and polyamide fibers in a ratio of 1:2. The individual layers 8a,8b were made on a card-ing machine and strengthened by needling. The lower layer 8b ofthe felt band has storage spaces 9 in the shape of channels which are oriented at an angle 30 towards the surface of the ~æ
felt band. The channels are slanted towards a direction which is parallel to the longitudinal axis of the felt band and extend from the surface of the lower layer toward the center of the band in the direction of movement of the felt band. The channels have been molten out in the lower layer 8b of the felt band by a radiation generated by a light radiation quantum generator 1, situated in front of the connecting line 7 of the connected lay-ers 8a,8b of the felt band in such a manner that the radiation beam impinges on the layer 8b of the felt band at an angle of 30. The beam acts on the moving layer 8b of the felt band through a rotating diaphragm 6 which causes the beam to simul-taneously perform a transverse movement across the width of the felt band. The felt band described is particularly suitable to be applied on presses with full rolls.
The multilayer felt band according to Figures 3 and 4 is made of four layers 8a,8b,8c,8d. All the layers are made of a mixture of polyester and polyamide fibers in a ratio of 1:4.
The storage spaces 9 in the shape of channels which are oriented at an angle 45 towards the surface of the felt band, are located in both middle layers 8c,8d of the felt band in such a manner that the channels of one layer are at an angle of 90 with re-spect to the channels of the other layer. Both the first layers 8a,8c are strengthened by needling and are connected at the con-necting line 7 with the other two layers 8d,8b which have also been previously strengthened by needling. In the zone of the connecting line 7, theradiation generated by two quantum genera-tors la,lb (Figure 4) situated in front of the connecting line 7 acts on the layers through a rotating diaphragm 6 in such a man-ner that the radiation beams generated by both generators cross one another, The multilayer felt band according to Figures 5 and 6 is made of an upper layer 8a and a lower layer 8b. Both layers 33;i~2 are made of polyamide fibers. The lower layer 8b represents a-bout one third of the thickness of the felt band. The indivi-dual layers of the felt band are made on a carding machine and have previously been strengthened by needling. At the boundary between the upper layer 8a and the lower layer 8b, there are pro-vided storage spaces 9 in the shape of channels which are paral-lel to the axis of the felt band in the longitudinal direction thereof to form parallel rows, whereby the channels of each row are mutually separated by gaps.
The multilayer felt band according to Figures 7 and 8 is made of three layers 8a,8b,8c. Each layer contains a mixture of polyester and polyamide fibers in the ratio of 1:3 and is strengthened by needling. The upper layer 8a is provided with storage spaces 9 in the shape of channels which are oriented at an angle of 60 towards the surface of the layer. Each channel extends from the surface to the center of the felt band in the direction of movement of the felt band in the paper making ma-chine. The middle layer 8c of the felt band is provided with storage spaces 9 in the shape of channels which are perpendicu-lar to the surface of the layer. The lower layer 8b is provided with storage spaces 9 in the shape of channels which are orien-ted at an angle of 10 towards the surface of the layer. Each channel extends from the opposite surface to the center of the felt band against the direction of movement of the felt band in the paper making machine. The direction of movement of the felt band is indicated by an arrow in the drawing. The channels of the individual layers 8a, 8c, 8b have different diameters, in a ratio of 1 : 2 : 4 from the upper layer 8a to the lower layer 8b.
The felt band is made o individual layers by guiding the upper layer 8a and the middle layer 8c toward the connecting line 7 between two rolls 5a,5b. Two light radiation generators la,lb are mounted in frontof the connecting line 7a. The beam gene-~8~æ
rated by generator la is at an angle of 60 with respect to thesurface of the upper layer 8a and the beam generated by genera-tor lb is at an angle of 90 with respect to the middle layer 8c.
The lower layer 8b of the felt band is joined with the layers 8a and 8c at the connecting line 7b and the generator lc located above this layer directs its radiation beam in the region of the connecting line 7b, said radiation beam being at an angle of 10 towards the lower layer 8b. The radiation beams generated by generators la,lb,lc pass through rotating diaphragms 6a,6b,6c and each quantum generator enables a movement of the beam along the whole width of the felt band. The felt band made in this manner is particularly suitable for removing large amounts of water.
The multilayer felt band according to Figures 9 and 10 is made of two layers 8a and 8b. Both layers consist of poly-amide fibers. The lower layer 8b is provided with storage spaces 9 in the shape of channels with trapezoid cross-section, its axis being perpendicular to the surface of the felt band. The upper layer 8a and the lower layer 8b are interconnected by storage spaces 9 in the shape of channels which are perpendicular to the surface of the felt band.
The channels 9 in the lower layer 8b are conically shaped, with their walls being at an angle which is different from 90 with respect to the surface of the felt band. These channels have been made under dynamic conditions at the connecting line 7, thus securing stable elastic walls thereof. The connecting line 7 is determined by two rolls 3a,3b provided with mantle openings 4a,4b. A reflecting mirror 2a is situated inside the roll 3a and a reflecting mirror 2b is inside the roll 3b. The storage spaces 9 have been molten out in the lower layer 8b under dyna-mic conditions, by a light radiation quantum generator lb whichis located near the roll 3b, The radiation of generator lb passes through a diaphragm 6b. The channel-~haped storage spaces 9 interconnecting the upper layer 8a and the lower layer 8b have been molten out at the connecting line 7 by the radiation gene-ratecl by the quantum generator la located in the roll 3a through a rotating diaphragm 6b.
This is a division of application No. 303,607, filed on May 18, 1978.
Claims
1. An arrangement for manufacturing a multilayer felt band comprising fibers of thermoplastic material, with storage spaces of the shape of channels in at least one layer of the felt band, comprising at least two rotating rolls adapted for guiding and connecting individual layers, at least one of said rolls being provided with a hollow mantle having openings therein, a reflecting mirror situated inside said mantle and adapted to be displaced within said mantle, and a quantum generator of light radiation situated near the face of said roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000371220A CA1118332A (en) | 1977-05-20 | 1981-02-18 | Multilayer felt band |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CSPV3328-77 | 1977-05-20 | ||
| CS773328A CS198481B1 (en) | 1977-05-20 | 1977-05-20 | Multilayer felt,method of and apparatus for manufacturing same |
| CA303,607A CA1113363A (en) | 1977-05-20 | 1978-05-18 | Multilayer felt band |
| CA000371220A CA1118332A (en) | 1977-05-20 | 1981-02-18 | Multilayer felt band |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1118332A true CA1118332A (en) | 1982-02-16 |
Family
ID=27165669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000371220A Expired CA1118332A (en) | 1977-05-20 | 1981-02-18 | Multilayer felt band |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1118332A (en) |
-
1981
- 1981-02-18 CA CA000371220A patent/CA1118332A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |