CA1292633C - Method of manufacturing papermaker's felt - Google Patents
Method of manufacturing papermaker's feltInfo
- Publication number
- CA1292633C CA1292633C CA000532990A CA532990A CA1292633C CA 1292633 C CA1292633 C CA 1292633C CA 000532990 A CA000532990 A CA 000532990A CA 532990 A CA532990 A CA 532990A CA 1292633 C CA1292633 C CA 1292633C
- Authority
- CA
- Canada
- Prior art keywords
- batt
- scrim
- layer
- melting point
- air permeability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/083—Multi-layer felts
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Abstract The present invention provides a solution to the prior art problem of producing a high density papermkers batt fabric or felt which may be secured to an undamaged under layer in an economic manner. The present invention provides these improvements by providing a batt which is comprised of a non-woven low melt scrim to which the batt material is initially needled.
Subsequent to producing a batt of the required density, the batt may, if desired, be needled or adhered to an under layer fabric.
The completed felt will be subjected a heat pressing operation which will elevate the temperature of the batt to a temperature above the softening temperature of the scrim but below the melting point of the batt fibers. In this manner, the batt and under layer fabric are unified to produce a multilayer papermakers felt with minimum effort and disruption of the under layer.
Subsequent to producing a batt of the required density, the batt may, if desired, be needled or adhered to an under layer fabric.
The completed felt will be subjected a heat pressing operation which will elevate the temperature of the batt to a temperature above the softening temperature of the scrim but below the melting point of the batt fibers. In this manner, the batt and under layer fabric are unified to produce a multilayer papermakers felt with minimum effort and disruption of the under layer.
Description
Title: METHOD OF MANUFACTURING PAPERMAKER'S FELT
BACKGROUND OF THE INVENTION
Field of the Invention The fabric of the instant invention is intended for use in the papermaking industry and finds particular application in the wet pres6 and dryer sections of papermaking equipment. In such equipment, the fabric is a carrying or conveying means which is intended for use in applications requiring either an endless or flat woven fabric. In the papermaking industry, fabrics of the instant invention are frequently referred to as felts, when used in the wet pre6s or dryer section, since they generally comprise a carrier fabric or layer which runs in contact with the equipment and a felt surface which runs in contact with the paper.
Description of the Prior Art It has been recognized in the prior art that it is desirable to provide a felt for use in papermaking machinery which comprises an under layer made of relatively rigid non-deformable material having a compressible felt layer thereon. It has been further recognized by the prior art that it is advantageous to use a needled felt layer in combination with the relatively rigid non-~eformable under layer. One example of such a prior art fabric is found in U.S. Patent Re.21,890 entitled INDUSTRIAL AND PAPERMAKERS
3k FELTS. This prior art reference discloses the most commonly known needled papermakers felt utilized in the papermaking industry.
More recently, an effort to improve the papermakers felt was disclosed in U.S. Patent 4,500,588. This patent discloses the use of a barrier layer contained within the felt. The purpose of this barrier layer is to prevent filler material from penetrating from the surface of the felt into the remainder of the felt.
The difficulty with the prior art approach comes in applying the batt or felt surface to the under layer and in obtaining a batt of sufficient density in an economic manner without damaging the under layer fabric during the needling operation.
Summary of the Invention The preeent invention provides a solution to the prior art problem of producing a high density papermakers felt having an undamaged under layer in an economic manner. The present invention provides these improvements by providing a batt which is comprised of a non-woven low melt scrim to which the batt material is initially needled. Subsequent to producing a batt of the required density, the batt is then needled or adhered to the under layer fabric. The completed felt will be subjected a heat pressing operation which will elevate the temperature of the batt to a temperature above the softening temperature of the scrim but below the melting point of the batt fibers. In this manner, the batt and under layer fabric are unified to produce the papermakers felt with m~ nimum effort and disruption of the under layer.
,~
~2~?~633 Brief Description of the Drawin~s Figure 1 is a fragmentary section of a batt according to the instant invention which is further fragmented to show the scrim.
Figure 2 is illustrative of one method of producing the batt in accordance with Figure 1.
Figure 3 illustrates a batt according to the instant invention unified with a woven under layer.
Figure 4 is illustrative of a batt according to the instant invention unified with a non-woven under layer which is comprised of a plurality of spiral wound helices which are interconnected by means of pintles.
Figure 5 is a section cut through a batt which is illustrative of an alternative embodiment utilizing multiple scrims.
DescriPtion of the Preferred Embodiment With reference to Figure 1, there is shown a batt in accordance with the instant invention. The batt 2 is comprised of a scrim 4 which is surrounded by batting material 6 which in the illustration is initially provided as upper layer 8 and lower layer 10. If desired, the batting material 6 may be provided as one or more upper layers 8 with or without lower layer 10. The scrim 4 is preferably comprised of a low melt synthetic material such as polypropylene which has a softening point of about 285 to 330 F.
Other synthetic materials may be selected so long as they have a melting point below that of the batt material 6. It will be noted 1~9Z633 that the scrim material 4 has a generally regular lattice configuration, however, such a regular configuration is not a requirement, although it is preferred. The regular lattice configuration is preferred since it provides a measure of predictability with respect to the location of the scrim within the batt 2 and does not adversely effect the required moisture absorption or permeability of the batt. It is expected that the scrim will have a finer mesh, more interstices per square inch, in certain applications in which it is desired to reduce marking.
With respect to the interstices of the scrim 4, it should be noted that there iB no required open area for the interstices but the scrim should be selected with interstices which will not adversely effect the feltsl performance in the areas of moisture absorption, making and/or permeability.
It iB intended that the scrim 4 will be selected so as to provide sufficient area for fiber retention while preserving the felt characteristics. In the illustrative embodiment the interstices of the scrim 4 are about one quarter inch squares and the scrim i~ approximately 15 mils thick. The scrim may be purchased in sheet form or may be made by laying suitable yarns in a lattice work which i6 then unified by heat setting or ultrasonic mean~. It will be understood by tho6e skilled in the art that the yarns forming the scrim need not be bonded at each of the intersections but should be bonded in amounts sufficient to permit handling of the scrim.
With respect to the batting material 6 which iB shown as 1~92633 comprised of an upper layer 8 and a lower layer 10 prior to needling about scrim 4, it will be understood by those skilled in the art that the initial batt layers 8 and 10 may be formed through the usual needling processes. Additionally, it will be understood by those skilled in the art that the batt material 10 prior to needling with the scrim 4 may comprise a roving of fibers which is placed over the scrim and needled thereto. In addition, it is contemplated that a blanket of roving may be used in place of individual rovings. In the preferred embodiment, it is preferred to use batting material which has been initially needled to provide batting material having a generally uniformed density and to facilitate handling thereof.
With reference to Figure 2, there is shown a means for producing the batt of Figure 1. A first supply roll 20 of scrim material i8 provided and a second supply roll 22 of batt material is provided in clo~e proximity thereto. Both of these materials are provided in unison over a support bed 24 which is positioned below a needling head 26. Needling heads such as 26 are known to those skilled in the art and one example thereof is shown in U.S.
Patent Re. 21,890. The materials are presented simultaneously to needling head 26 and are needled in accordance with fabric design to achieve the required density. Subsequent to needling, the material is rewound on supply roll 28. In the event that it is do8~red to apply a second layer of batt material, the supply roll is then po~itioned at 20 80 that the material discharged from the roll will present the scrim in a face up position towards needling ?2633 head 26. A second layer of batt is then applied in the same manner as the first. This procedure may continue until such time as the desired thickness for the batt material is achieved.
Depending upon the thickness of the completed batt and the degree of stability desired, the batt produced in accordance with the above may be further provided with another scrim layer and additional batt material or initially provided with two scrims or more. Thus, with reference to Figure 5 and 6, it can be seen that two scrim layers 4 are provided in the final needled batt. In the embodiment of Figure 5 the scrim layers are separated by batt material. In the embodiment of Figure 6 the scrim layers are adjacent to each other. It will be understood by those skilled in the art that the needling process must accomplish sufficient depth of needling to provide the desired uniformity and that the respective layers of batt material 6 will be fully unified and etabilized in the heat treatment process. Likewise, it will be understood by those skilled in the art that the scrims may be vertically aligned, such as Figure 5, or staggered, such as Figure 6, depending upon the desired application.
It is during the aforementioned needling operation that the scrim provides secure base work which prevents excessive fiber migration as a reeult of the needling operation. As a result of thie, it i8 possible to needle the batt more severely than can be done without the ecrim and more severely than can be done directly on the woven or epiral formed under layer. As a result, a more uniformed higher density homogeneous batt is obtained. After the X
~Z633 desired thickness of the batt is obtained the batt may be subjected to a heat pressing operation at a temperature below the melting point of the batt fibers but at a temperature sufficient to cause softening or melting (flGwing) of the scrim. However, it is preferable to have the heat pressing operation done after needling of the batt to the under layer fabric. It will be understood by those skilled in the art that the temperature will generally exceed the heat setting temperature of the scrim and must be sufficient to result in tackiness of the scrim. It will be further understood that such a temperature may be achieved without a complete melting or flowing of the scrim. It will likewise be understood that the scrim may undergo shape deformation as a result of the heat treatment and that the drawing figures are merely illustrative of the invention.
As a result of the heat treatment of the scrim, it will adhere to the batt fibers and increase the adhesion between the batt materials. In this manner, the scrim will add to the strength of the batt and reduce the likelihood that the batt will experience fiber migration or layer separation during use. As can be seen from the foregone, the scrim provides a denser batt, a more uniformed or homogeneous batt and a batt having greater tenacity than the prior art batts.
With reference to Figure 3, there is shown a batt 2 according to the in~tant invention unified with a woven under layer 30. Batt 2 and under layer 30 may be unified through a needling procees, such as that described with reference to Figure 2 and known to those skilled in the art, or may be unified through the application of adhesives between the batt 2 and under layer 30.
The application of such adhesives to the batt will be also known to those skilled in the art as exemplified by U.S. Patent 4,528,236.
With reference to Figure 4 there is shown a batt 2 according to the instant invention adhered to a non-woven under layer 40 formed of a plurality of helices interconnected by pintles. The fabric of Figure 4 may be unified in accordance with the method discussed with reference to Figure 2 or by the application of adhesives. Once again, the methods of unifying the fabric will be known to those skilled in the art and is exemplified by U.S. Patent 4,528,236.
BACKGROUND OF THE INVENTION
Field of the Invention The fabric of the instant invention is intended for use in the papermaking industry and finds particular application in the wet pres6 and dryer sections of papermaking equipment. In such equipment, the fabric is a carrying or conveying means which is intended for use in applications requiring either an endless or flat woven fabric. In the papermaking industry, fabrics of the instant invention are frequently referred to as felts, when used in the wet pre6s or dryer section, since they generally comprise a carrier fabric or layer which runs in contact with the equipment and a felt surface which runs in contact with the paper.
Description of the Prior Art It has been recognized in the prior art that it is desirable to provide a felt for use in papermaking machinery which comprises an under layer made of relatively rigid non-deformable material having a compressible felt layer thereon. It has been further recognized by the prior art that it is advantageous to use a needled felt layer in combination with the relatively rigid non-~eformable under layer. One example of such a prior art fabric is found in U.S. Patent Re.21,890 entitled INDUSTRIAL AND PAPERMAKERS
3k FELTS. This prior art reference discloses the most commonly known needled papermakers felt utilized in the papermaking industry.
More recently, an effort to improve the papermakers felt was disclosed in U.S. Patent 4,500,588. This patent discloses the use of a barrier layer contained within the felt. The purpose of this barrier layer is to prevent filler material from penetrating from the surface of the felt into the remainder of the felt.
The difficulty with the prior art approach comes in applying the batt or felt surface to the under layer and in obtaining a batt of sufficient density in an economic manner without damaging the under layer fabric during the needling operation.
Summary of the Invention The preeent invention provides a solution to the prior art problem of producing a high density papermakers felt having an undamaged under layer in an economic manner. The present invention provides these improvements by providing a batt which is comprised of a non-woven low melt scrim to which the batt material is initially needled. Subsequent to producing a batt of the required density, the batt is then needled or adhered to the under layer fabric. The completed felt will be subjected a heat pressing operation which will elevate the temperature of the batt to a temperature above the softening temperature of the scrim but below the melting point of the batt fibers. In this manner, the batt and under layer fabric are unified to produce the papermakers felt with m~ nimum effort and disruption of the under layer.
,~
~2~?~633 Brief Description of the Drawin~s Figure 1 is a fragmentary section of a batt according to the instant invention which is further fragmented to show the scrim.
Figure 2 is illustrative of one method of producing the batt in accordance with Figure 1.
Figure 3 illustrates a batt according to the instant invention unified with a woven under layer.
Figure 4 is illustrative of a batt according to the instant invention unified with a non-woven under layer which is comprised of a plurality of spiral wound helices which are interconnected by means of pintles.
Figure 5 is a section cut through a batt which is illustrative of an alternative embodiment utilizing multiple scrims.
DescriPtion of the Preferred Embodiment With reference to Figure 1, there is shown a batt in accordance with the instant invention. The batt 2 is comprised of a scrim 4 which is surrounded by batting material 6 which in the illustration is initially provided as upper layer 8 and lower layer 10. If desired, the batting material 6 may be provided as one or more upper layers 8 with or without lower layer 10. The scrim 4 is preferably comprised of a low melt synthetic material such as polypropylene which has a softening point of about 285 to 330 F.
Other synthetic materials may be selected so long as they have a melting point below that of the batt material 6. It will be noted 1~9Z633 that the scrim material 4 has a generally regular lattice configuration, however, such a regular configuration is not a requirement, although it is preferred. The regular lattice configuration is preferred since it provides a measure of predictability with respect to the location of the scrim within the batt 2 and does not adversely effect the required moisture absorption or permeability of the batt. It is expected that the scrim will have a finer mesh, more interstices per square inch, in certain applications in which it is desired to reduce marking.
With respect to the interstices of the scrim 4, it should be noted that there iB no required open area for the interstices but the scrim should be selected with interstices which will not adversely effect the feltsl performance in the areas of moisture absorption, making and/or permeability.
It iB intended that the scrim 4 will be selected so as to provide sufficient area for fiber retention while preserving the felt characteristics. In the illustrative embodiment the interstices of the scrim 4 are about one quarter inch squares and the scrim i~ approximately 15 mils thick. The scrim may be purchased in sheet form or may be made by laying suitable yarns in a lattice work which i6 then unified by heat setting or ultrasonic mean~. It will be understood by tho6e skilled in the art that the yarns forming the scrim need not be bonded at each of the intersections but should be bonded in amounts sufficient to permit handling of the scrim.
With respect to the batting material 6 which iB shown as 1~92633 comprised of an upper layer 8 and a lower layer 10 prior to needling about scrim 4, it will be understood by those skilled in the art that the initial batt layers 8 and 10 may be formed through the usual needling processes. Additionally, it will be understood by those skilled in the art that the batt material 10 prior to needling with the scrim 4 may comprise a roving of fibers which is placed over the scrim and needled thereto. In addition, it is contemplated that a blanket of roving may be used in place of individual rovings. In the preferred embodiment, it is preferred to use batting material which has been initially needled to provide batting material having a generally uniformed density and to facilitate handling thereof.
With reference to Figure 2, there is shown a means for producing the batt of Figure 1. A first supply roll 20 of scrim material i8 provided and a second supply roll 22 of batt material is provided in clo~e proximity thereto. Both of these materials are provided in unison over a support bed 24 which is positioned below a needling head 26. Needling heads such as 26 are known to those skilled in the art and one example thereof is shown in U.S.
Patent Re. 21,890. The materials are presented simultaneously to needling head 26 and are needled in accordance with fabric design to achieve the required density. Subsequent to needling, the material is rewound on supply roll 28. In the event that it is do8~red to apply a second layer of batt material, the supply roll is then po~itioned at 20 80 that the material discharged from the roll will present the scrim in a face up position towards needling ?2633 head 26. A second layer of batt is then applied in the same manner as the first. This procedure may continue until such time as the desired thickness for the batt material is achieved.
Depending upon the thickness of the completed batt and the degree of stability desired, the batt produced in accordance with the above may be further provided with another scrim layer and additional batt material or initially provided with two scrims or more. Thus, with reference to Figure 5 and 6, it can be seen that two scrim layers 4 are provided in the final needled batt. In the embodiment of Figure 5 the scrim layers are separated by batt material. In the embodiment of Figure 6 the scrim layers are adjacent to each other. It will be understood by those skilled in the art that the needling process must accomplish sufficient depth of needling to provide the desired uniformity and that the respective layers of batt material 6 will be fully unified and etabilized in the heat treatment process. Likewise, it will be understood by those skilled in the art that the scrims may be vertically aligned, such as Figure 5, or staggered, such as Figure 6, depending upon the desired application.
It is during the aforementioned needling operation that the scrim provides secure base work which prevents excessive fiber migration as a reeult of the needling operation. As a result of thie, it i8 possible to needle the batt more severely than can be done without the ecrim and more severely than can be done directly on the woven or epiral formed under layer. As a result, a more uniformed higher density homogeneous batt is obtained. After the X
~Z633 desired thickness of the batt is obtained the batt may be subjected to a heat pressing operation at a temperature below the melting point of the batt fibers but at a temperature sufficient to cause softening or melting (flGwing) of the scrim. However, it is preferable to have the heat pressing operation done after needling of the batt to the under layer fabric. It will be understood by those skilled in the art that the temperature will generally exceed the heat setting temperature of the scrim and must be sufficient to result in tackiness of the scrim. It will be further understood that such a temperature may be achieved without a complete melting or flowing of the scrim. It will likewise be understood that the scrim may undergo shape deformation as a result of the heat treatment and that the drawing figures are merely illustrative of the invention.
As a result of the heat treatment of the scrim, it will adhere to the batt fibers and increase the adhesion between the batt materials. In this manner, the scrim will add to the strength of the batt and reduce the likelihood that the batt will experience fiber migration or layer separation during use. As can be seen from the foregone, the scrim provides a denser batt, a more uniformed or homogeneous batt and a batt having greater tenacity than the prior art batts.
With reference to Figure 3, there is shown a batt 2 according to the in~tant invention unified with a woven under layer 30. Batt 2 and under layer 30 may be unified through a needling procees, such as that described with reference to Figure 2 and known to those skilled in the art, or may be unified through the application of adhesives between the batt 2 and under layer 30.
The application of such adhesives to the batt will be also known to those skilled in the art as exemplified by U.S. Patent 4,528,236.
With reference to Figure 4 there is shown a batt 2 according to the instant invention adhered to a non-woven under layer 40 formed of a plurality of helices interconnected by pintles. The fabric of Figure 4 may be unified in accordance with the method discussed with reference to Figure 2 or by the application of adhesives. Once again, the methods of unifying the fabric will be known to those skilled in the art and is exemplified by U.S. Patent 4,528,236.
Claims (11)
1. An improved papermaker's felt of the type having an under layer and a moisture absorbing and air permeable batt layer joined into a single fabric, wherein the improvement comprises a batt layer including fibrous batt material and scrim material, the scrim material having a melting point lower than the melting point of the fibrous batt material, which were repeatedly needled to substantially establish the final batt density, moist absorption and air permeability through said batt layer, prior to it being joined with the under layer, said scrim material treated to adhere the fibrous batt material while maintaining the moisture absorption and air permeability through said batt layer.
2. An improved papermaker's fabric of the type having an under layer and a moisture absorbing and air permeable batt layer joined into a single fabric, wherein the improvement is a batt layer which comprises:
fibrous batt material; and scrim material, the scrim material having a lower melting point than the melting point of the fibrous batt material and interstices of sufficient open area to permit moisture absorption and air permeability through said scrim material, wherein said batt and scrim materials were repeatedly needled to substantially establish the final density, moisture absorption and air permeability of said batt layer prior to joining with said under layer, said scrim material treated to adhere the fibrous batt material while maintaining the moisture absorption and air permeability through said batt layer.
fibrous batt material; and scrim material, the scrim material having a lower melting point than the melting point of the fibrous batt material and interstices of sufficient open area to permit moisture absorption and air permeability through said scrim material, wherein said batt and scrim materials were repeatedly needled to substantially establish the final density, moisture absorption and air permeability of said batt layer prior to joining with said under layer, said scrim material treated to adhere the fibrous batt material while maintaining the moisture absorption and air permeability through said batt layer.
3. An improved moisture absorbing papermaker's fabric of the type having an under layer and a batt layer joined into a single fabric, wherein the improvement is a batt layer which comprises:
fibrous batt material and scrim material which were repeatedly needled to substantially establish the final density of said batt layer prior to joining with said under layer, said scrim material having a melting point lower than the density, moist absorption and air permeability through said batt layer, prior to it being joined with the under layer, said scrim material treated to adhere the fibrous batt materials while maintaining the moisture absorption and air permeability through said batt layer.
fibrous batt material and scrim material which were repeatedly needled to substantially establish the final density of said batt layer prior to joining with said under layer, said scrim material having a melting point lower than the density, moist absorption and air permeability through said batt layer, prior to it being joined with the under layer, said scrim material treated to adhere the fibrous batt materials while maintaining the moisture absorption and air permeability through said batt layer.
4. An improved papermaker's fabric of the type having an under layer and a moisture absorbing and air permeable batt layer joined into a single fabric, wherein the improvement is a batt layer which comprises:
fibrous batt material; and scrim material, the scrim which were repeatedly needled to substantially establish the final density of siad batt layer prior to joining with said under layer, said scrim material having a melting point lower hten the melting point of the fibrous batt material and interstices of sufficient open area to preserve the homogenous moisture absorption and air permeability characteristics of said batt leyer, said batt layer treated to adhere the scrim and fibrous batt materials while preserving the said characteristics of the batt layer.
fibrous batt material; and scrim material, the scrim which were repeatedly needled to substantially establish the final density of siad batt layer prior to joining with said under layer, said scrim material having a melting point lower hten the melting point of the fibrous batt material and interstices of sufficient open area to preserve the homogenous moisture absorption and air permeability characteristics of said batt leyer, said batt layer treated to adhere the scrim and fibrous batt materials while preserving the said characteristics of the batt layer.
5. An improved homogenous, moisture absorbing and air permeable fiber batt for use as a papermaker's fabric, wherein the improvement comprises the combination of fibrous batt material and scrim material, having a lower melting point than the melting point of the fibrous batt material and interstices of less than about one-quarter inch squares which permit moisture absorption and air permeability through said scrim material, which have been repeatedly needled to surround scrim material with said batt material and to substantially establish the final homogenous density, moisture absorption and air permeability through said fiber batt, said fiber batt treated to adhere the scrim and the fibrous batt materials while maintaining the moisture absorption and air permeability through said fiber batt.
6. A method of producing an improved homogenous papermaker's batt comrpising the steps of:
a) providing a low melting point scrim material;
b) providing batt material comprised of fibers having a melting point greater than the melting point of said scrim material;
c) needling a layer of said batt material to said scrim to substantially establish the final density, moisture absorption and air permeability of resultant batt; and d) elevating the temperature of the product of step (c) to a temperature at least equal to the softening temperature of said scrim but below the melting point of said fibers.
a) providing a low melting point scrim material;
b) providing batt material comprised of fibers having a melting point greater than the melting point of said scrim material;
c) needling a layer of said batt material to said scrim to substantially establish the final density, moisture absorption and air permeability of resultant batt; and d) elevating the temperature of the product of step (c) to a temperature at least equal to the softening temperature of said scrim but below the melting point of said fibers.
7. The method of claim 6 further comprised of:
needling a second layer of batt material to said scrim in accordance with step (c) prior to performing step (d).
needling a second layer of batt material to said scrim in accordance with step (c) prior to performing step (d).
8. The method of claim 7 further comprised of:
needling said second layer of batt material to said scrim on the side opposite said layer of batt material
needling said second layer of batt material to said scrim on the side opposite said layer of batt material
9. A method of providing an improved papermaker's felt comprising steps of:
a) providing a low melting point scrim material;
b) providing a batt material comprised of fibers having a melting point greater than melting point of said scrim material;
c) needling a layer of batt material to said scrim to substantially establish the final density, moisture absorption and air permeability through the resultant batt layer;
d) needling the product of step (c) to an underlayer fabric; and e) elevating the temperature of the product of step (d) to a temperature at least equal to the softening temperature of said scrim but below the melting point of said fibers.
a) providing a low melting point scrim material;
b) providing a batt material comprised of fibers having a melting point greater than melting point of said scrim material;
c) needling a layer of batt material to said scrim to substantially establish the final density, moisture absorption and air permeability through the resultant batt layer;
d) needling the product of step (c) to an underlayer fabric; and e) elevating the temperature of the product of step (d) to a temperature at least equal to the softening temperature of said scrim but below the melting point of said fibers.
10. The method of claim 9 further comprised of:
the step of needling a second batt of material to said scrim in accordance with step (c) prior to performing step (d).
the step of needling a second batt of material to said scrim in accordance with step (c) prior to performing step (d).
11. The method of claim 10 further comprising the step of:
needling said second layer of batt material to said scrim on the side opposite said first layer of batt material.
needling said second layer of batt material to said scrim on the side opposite said first layer of batt material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US84408886A | 1986-03-26 | 1986-03-26 | |
| US844,088 | 1986-03-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1292633C true CA1292633C (en) | 1991-12-03 |
Family
ID=25291781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000532990A Expired - Lifetime CA1292633C (en) | 1986-03-26 | 1987-03-25 | Method of manufacturing papermaker's felt |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0239207A3 (en) |
| JP (1) | JPS62257452A (en) |
| AU (1) | AU593626B2 (en) |
| CA (1) | CA1292633C (en) |
| FI (1) | FI870804A (en) |
| NZ (1) | NZ219235A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4759975A (en) * | 1986-11-06 | 1988-07-26 | Asten Group, Inc. | Papermaker's wet press felt having multi-layered base fabric |
| DE4040861C3 (en) * | 1990-12-20 | 2001-02-01 | Conrad Munzinger & Cie Ag Olte | Press felt and process for its production |
| WO1995022645A1 (en) * | 1994-02-18 | 1995-08-24 | Kuangfei Wang | A heat-retaining laminated material and the process of making the same |
| US5549967A (en) | 1995-05-04 | 1996-08-27 | Huyck Licensco, Inc. | Papermakers' press fabric with increased contact area |
| GB2302669B (en) * | 1995-06-27 | 1997-07-23 | Marilyn Olga Jeffcoat | Fabrication process for nonwoven fabric and products thus fabricated for use as non-adherent absorbent medical and veterinary dressings |
| GB0205574D0 (en) * | 2002-03-09 | 2002-04-24 | Voith Fabrics Heidenheim Gmbh | Industrial fabrics |
| US7455752B2 (en) * | 2004-07-22 | 2008-11-25 | Albany International Corp. | Semi-permeable fabrics for transfer belt and press fabric applications |
| JP2016540138A (en) * | 2013-10-18 | 2016-12-22 | ボナー ベスローテン フェンノートシャップＢｏｎａｒ Ｂ．Ｖ． | Method for providing a carrier material |
| US20150308045A1 (en) * | 2014-04-25 | 2015-10-29 | Huyck Licensco, Inc. | Seamed papermaker's press felt with reinforced batt layer |
| JP7053416B2 (en) * | 2018-09-13 | 2022-04-12 | 日本フエルト株式会社 | Paper felt |
| CN114645483A (en) * | 2022-02-21 | 2022-06-21 | 江苏金呢工程织物股份有限公司 | Composite papermaking felt and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE557442A (en) * | ||||
| GB1490516A (en) * | 1974-10-08 | 1977-11-02 | Grylls R | Fabrics |
| US4427734A (en) * | 1982-04-19 | 1984-01-24 | Albany International Corp. | Wet press felt for papermaking machines |
| FI64960C (en) * | 1982-10-08 | 1984-02-10 | Tamfelt Oy Ab | TRANSPORTFILT FOER PAPPERSTILLVERKNING OCH FOERFARANDE FOER DES TILLVERKNING |
| ATE30345T1 (en) * | 1983-08-11 | 1987-11-15 | Cofpa | PROCESS FOR ADHERING A PERMEABLE LAYER TO A COUPLED FIBERS SUPPORT, AND THE PAPER MACHINE FELTS AND FILTER FABRICS SO PRODUCED. |
| CA1221614A (en) * | 1984-08-10 | 1987-05-12 | Asten, Inc. | Laminated soft faced-spiral woven papermakers fabric |
-
1987
- 1987-02-06 EP EP87301062A patent/EP0239207A3/en not_active Ceased
- 1987-02-11 NZ NZ219235A patent/NZ219235A/en unknown
- 1987-02-25 FI FI870804A patent/FI870804A/en not_active Application Discontinuation
- 1987-03-25 AU AU70625/87A patent/AU593626B2/en not_active Ceased
- 1987-03-25 JP JP62069237A patent/JPS62257452A/en active Pending
- 1987-03-25 CA CA000532990A patent/CA1292633C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FI870804A (en) | 1987-09-27 |
| NZ219235A (en) | 1988-06-30 |
| EP0239207A3 (en) | 1989-11-08 |
| JPS62257452A (en) | 1987-11-10 |
| AU593626B2 (en) | 1990-02-15 |
| EP0239207A2 (en) | 1987-09-30 |
| AU7062587A (en) | 1987-10-01 |
| FI870804A0 (en) | 1987-02-25 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |