Claims
- 1. A press felt for a papermaking machine, comprising:
- a. a lower fabric layer comprised of a plurality of interlaced longitudinal and cross filaments; and
- b. an upper fabric overlaid on said lower fabric layer and having an upper paper contacting surface, said upper fabric includes a blocking layer intermediate said lower fabric layer and said paper contacting surface and said blocking layer comprising a plurality of mutually spaced filaments extending transverse to the direction of advance of the felt and a substantially continuous passage is disposed between adjacent filaments of said blocking layer for permitting water to flow therethrough to said lower fabric layer while preventing water from flowing therethrough to said upper fabric and said blocking layer disposed parallel to said paper contacting surface.
- 2. The felt of claim 1, wherein:
- a. said blocking layer covers from about 45% to about 85% of said upper fabric layer.
- 3. The felt of claim 1, wherein:
- a. said blocking layer filaments are rectangular in cross section.
- 4. The felt of claim 3, wherein:
- a. said blocking layer filaments are flat, and each filament extends parallel to said paper contacting surface.
- 5. The felt of claim 4, wherein:
- a. each of said passages is an elongated slot.
- 6. The felt of claim 1, wherein:
- a. said blocking layer is spaced from said paper contacting surface a distance not exceeding the distance said blocking layer is spaced from said lower fabric layer.
- 7. The felt of claim 1, wherein:
- a. said longitudinal and cross filaments are plastic monofilaments;
- b. said blocking layer filaments are plastic.
- 8. A paper machine press felt assembly, comprising:
- a. a lower fabric layer comprised of a plurality of interlaced longitudinal and cross filaments; and
- b. an upper fabric layer overlaid on and stitched to said lower fabric layer and having an upper paper contacting surface, said upper fabric layer includes a blocking layer disposed parallel to said paper contacting surface and comprising a plurality of mutually spaced plastic filaments extending transverse to the direction of felt advance and a plurality of soluble threads extending parallel to the direction of felt advance so that, after said soluble threads have been dissolved, a substantially continuous passage is disposed between adjacent ones of said plastic filaments for permitting water to flow therethrough to said lower fabric layer while preventing water from flowing therethrough to said upper fabric layer.
- 9. The assembly of claim 8, wherein:
- a. said plastic filaments are rectangular in cross section.
- 10. The assembly of claim 9, wherein:
- a. said plastic filaments are flat and each plastic filament extends parallel to said paper contacting surface.
- 11. The assembly of claim 9, wherein:
- a. said plastic filaments overlie from about 45% to about 85% of said lower fabric layer.
- 12. The assembly of claim 8, wherein:
- a. said blocking layer is intermediate said paper contacting surface and said lower fabric layer.
- 13. The assembly of claim 12, wherein:
- a. said blocking layer is spaced from said paper contacting surface a distance not exceeding the distance said blocking layer is spaced from said lower fabric layer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
4002761 |
Jan 1990 |
DEX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 07/648,166, filed on Jan. 31, 1991 is now abandoned.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
648166 |
Jan 1991 |
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