Title:
METHOD OF MAKING PRESS FELT, AND PRESS FELT
Document Type and Number:
WIPO Patent Application WO/2002/053834
Kind Code:
A1
Abstract:
The invention relates to a method of making a press felt, a press felt and a base fabric. The base fabric (2) comprises a surface component (4) on the surface facing the paper web to be dried and a base component (5) below the surface component. The transverse jointing edges of the base component (5) are provided with seam loops (9), by means of which the base component can be connected into a closed loop. At the first jointing edge of the base fabric the surface component (4) extends for a predetermined distance longer than the base component (5) and forms a seam flap (13) that protects the seam area (14) of the base component. At the second jointing edge the base component (5) extends for the length of the seam flap (13) longer than the surface component (4).
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Inventors:
HYVOENEN KARI (FI)
REHAKKA HEIKKI (FI)
VIRTANEN TAUNO (FI)
REHAKKA HEIKKI (FI)
VIRTANEN TAUNO (FI)
Application Number:
PCT/FI2001/001110
Publication Date:
July 11, 2002
Filing Date:
December 17, 2001
Export Citation:
Assignee:
TAMFELT OYJ ABP (FI)
HYVOENEN KARI (FI)
REHAKKA HEIKKI (FI)
VIRTANEN TAUNO (FI)
HYVOENEN KARI (FI)
REHAKKA HEIKKI (FI)
VIRTANEN TAUNO (FI)
International Classes:
D21F7/08; D21F7/10; (IPC1-7): D21F7/10
Domestic Patent References:
| WO1998038379A1 | 1998-09-03 |
Foreign References:
| US4698250A | 1987-10-06 | |||
| EP0294951A1 | 1988-12-14 | |||
| EP0367614A2 | 1990-05-09 | |||
| EP1035252A2 | 2000-09-13 |
Attorney, Agent or Firm:
KOLSTER OY AB (Iso Roobertinkatu 23 P.O. Box 148 Helsinki, FI)
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Claims:
CLAIMS
| 1. | A method of making a press felt, the method comprising the steps of forming a base fabric (2), which comprises at least two superim posed components, the first of which is a webside surface component (4) and the second is a base component (5); weaving the base component of warp and weft yarns and providing a first and a second transverse jointing edges of the base component with seam loops (9) of the weft yarns for interconnection; needling at least one batt fibre layer (1) at least on the base fabric surface facing a web to be dried; assembling the press felt into a closedloop piece by arranging the jointing edges of the base fabric edge on edge, whereby the jointing edges form a seam area (14), where the seam loops intermesh and form a seam loop channel in the transverse direction of the press felt, and a seam yarn (15), which interconnects the jointing edges, is inserted in the seam loop channel, characterized by extending the surface component (4) at a first jointing edge of the base fabric for a predetermined distance longer than the base component (5) in the longitudinal direction of the press felt, whereby a seam flap (13) extend ing over at least the seam area (14) of the base component is provided at the first jointing edge when the base fabric (2) is formed; extending the base component (5) at a second jointing edge of the base fabric for the length of the seam flap (13) longer than the surface compo nent (4); and needling a batt fibre layer (1) on the base fabric (2) provided with the seam flap (13). |
| 2. | A method as claimed in claim 1, c h a r a c t e r i z e d by weav ing the surface component (4) and the base component (5) of the base fabric in separate steps, and assembling the base fabric (2) by superimposing the independent surface component and the independent base component. |
| 3. | A method as claimed in claim 1, c h a r a c t e r i z e d by weav ing the surface component (4) and the base component (5) of the base fabric simultaneously to be independent weave layers each having their own warp yarns (7) and weft yarns (8), by interconnecting the surface component and the base component during weaving with binding yarns that run between the com ponents, by weaving the surface component (4) for a predetermined distance longer than the base component (5) at the first jointing edge of the base fabric so as to form the seam flap (13), and by weaving the base component (5) for the length of the seam flap (13) longer than the surface component (4) at the second jointing edge of the base fabric. |
| 4. | A method as claimed in claim 1, c h a r a c t e r i z e d by weav ing the surface component (4) and the base component (5) of the base fabric simultaneously to be independent weave layers each having their own warp yarns (7) and weft yarns (8), by interconnecting the surface component and the base component during weaving with binding yarns that run between the com ponents, by weaving the base component in horseshoe form and the surface component into a closed loop around it, by cutting the surface component (4) in the transverse direction at a distance corresponding the length of the seam flap from the jointing edge of the base fabric. |
| 5. | A method as claimed in claim 1, c h a r a c t e r i z e d by forming the base fabric surface component (4) of surface weft yarns (8b) which are arranged to interlace with the warp yarns (7) of the base component (5), by extending the surface weft yarns (8b) longer than the base component weft yarns at the first jointing edge of the base fabric so as to form the seam flap (13), by applying for the seam flap portion surface warp yarns, separate from the base component, which are bound with the surface weft yarns, and by ex tending the base component for the length of the seam flap longer than the surface weft yarns at the second jointing edge of the base fabric. |
| 6. | A method as claimed in claim 1, c h a r a c t e r i z e d by forming the surface component of a yarn array. |
| 7. | A method as claimed in any one of the preceding claims, characterized by assembling the base fabric base component (5), in the longitudinal direction, of at least two different weaves whose transverse jointing edges are interconnected in extension of one another. |
| 8. | A press felt, which comprises a base fabric (2) and a batt fibre layer (1) attached onto at least the surface of the base fabric facing the web to be dried, and in which the base fabric (2) comprises at least two superimposed compo nents, the first of which is a surface component (4) facing the web to be dried and the second is a base component (5), the base component is woven of warp yarns (7) and weft yarns (8), and seam loops (9) of weft yarns are provided at a first and a second trans verse jointing edges of the base component for interconnection, the press felt can be assembled into a closed loop by arranging the jointing edges of the base fabric edge on edge, whereby the jointing edges form a seam area (14), where the seam loops (9) intermesh and form a seam loop channel in the transverse direction of the press felt, in which channel the seam yarn (15) interlinking the jointing edges can be inserted, characterized inthat observed in the longitudinal direction (A) of the press felt, the sur face component (4) extends longer than the base component (5) at the first jointing edge of the base fabric and forms at the first jointing edge a seam flap (13) that is designed to extend at least over the base component seam area (14); that at the second jointing edge of the base fabric the base compo nent extends for the length of the seam flap (13) longer than the surface com ponent (4); and that the batt fibre layer (1) is attached after forming the seam flap (13). |
| 9. | A press felt as claimed in claim 8, characterized in that the surface component (4) and the base component (5) of the base fabric are independent weave layers that are woven in separate steps and superimposed when the base fabric is assembled. |
| 10. | A press felt as claimed in claim 8, c h a r a c t e r i z e d in that the surface component (4) and the base component (5) of the base fabric are independent weave layers each having their own warp yarns and weft yarns, that the surface component and the base component are interconnected dur ing weaving with binding yarns running between the surface component and the base component, that the surface component is woven for a predetermined distance longer than the base component at the first jointing edge of the base fabric so as to form the seam flap, and that at the second jointing edge of the base fabric the base component is woven for the length of the seam flap longer than the surface component. |
| 11. | A press felt as claimed in claim 8, c h a r a c t e r i z e d in that the base fabric surface component (4) consists of surface weft yarns (8b) which are arranged to interlace with the warp yarns (7) of the base component (5), that the surface weft yarns (8b) extend for the length of the seam flap (13) longer than the weft yarns (8) of the base component (5) at the first jointing edge of the base fabric, that the seam flap comprises surface warp yarns, separate from the base component, which interlace with the surface weft yarns, and that the base component (5) extends for the length of the seam flap (13) longer than the surface weft yarns (8b) at the second jointing edge of the base fabric. |
| 12. | A press felt as claimed in any one of claims 8 to 11, c h a r a c t e r i z e d in that the base fabric base component comprises at least two weaves interconnected by their jointing edges. |
| 13. | A press felt as claimed in claim 8, c h a r a c t e r i z e d in that the surface component is a nonwoven structure. |
| 14. | A press felt base fabric, wherein the base fabric (2) comprises at least two superimposed compo nents, the first of which is a surface component (4) facing the web to be dried and the second is a base component (5); the base component (5) is woven of warp yarns (7) and weft yarns (8), and seam loops (9) of weft yarns are provided at a first and a second transverse jointing edges of the base component (5) for interconnection, characterized inthat observed in the longitudinal direction (A), the surface component (4) extends longer than the base component (5) at the first jointing edge of the base fabric (2) and forms at the first jointing edge a seam flap (13) which is designed to extend at least over the seam area (14) of the base component (5), and that at the second jointing edge of the base fabric (2) the base com ponent (5) extends for the length of the seam flap (13) longer than the surface component (4). |