Pin seamed papermakers felt having a reinforced batt flap

• US 4,764,417 A
• Filed: 06/08/1987
• Issued: 08/16/1988
• Est. Priority Date: 06/08/1987
• Status: Expired due to Fees

• Current Assignee: Appleton Mills (Voith GmbH & Co. KGaA)
• Original Assignee: Appleton Mills (Voith GmbH & Co. KGaA)
• Inventors: Gulya, Thomas G.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/059,421
• Time in Patent Office: 435 Days
• Field of Search: 139/383 AA, 162/DIG. 1, 162/358, 428/234, 428/300, 428/222, 428/223, 28/110, 28/141
• US Class Current: 428/222
• CPC Class Codes: D21F 7/083 Multi-layer felts
• CPC Class Codes: D21F 7/10 Seams thereof
• CPC Class Codes: Y10S 162/90 Papermaking press felts
• CPC Class Codes: Y10S 162/904 with specified seam structure of papermaking belt
• CPC Class Codes: Y10T 428/249922 Embodying intertwined or helical component[s]
• CPC Class Codes: Y10T 428/249923 Including interlaminar mechanical fastener

Abstract

A papermakers felt composed of a pin seam base fabric and a needled batt and having a reinforced batt flap covering the pin seam. The ends of the woven base fabric are provided with interdigitated loops which are connected by a pin to form a pin seam joint. A layer of machine direction yarns are disposed on a face of the base fabric and extend across the joint. A fibrous batt is needled into the base fabric and machine direction yarns. To install the felt on a papermaking machine, the batt is slit at a location spaced from the joint and the portion of the batt between the slit and the joint is pulled away from the base fabric to provide a flap. The machine direction yarns are separated from the base fabric along with the batt and serve to reinforce the batt flap, preventing the flap from tearing away from the felt.

Claims

1. A method of producing and installing a pin seam felt on a papermaking machine, comprising the steps of forming a base fabric having interdigitated loops at its ends joined by a pin to provide an endless fabric, applying machine direction yarns to a face of said fabric and across the pin seam joint, needling a batt of fibrous material to said face to intertwine said fibrous material with said machine direction yarns and said base fabric, cutting the batt and said yarns transversely at a location spaced from said joint, separating a portion of the batt and said yarns extending from said location to adjacent said joint to provide a batt flap, removing said pin from said loops to enable said felt to be opened, installing the open felt on a papermaking machine and interdigitating said loops, and inserting said pin into the interdigitated loops.

2. The method of claim 1 wherein the step of forming said base fabric comprises interweaving warp and weft yarns to form said fabric.

3. The method of claim 1 wherein said machine direction yarns extend continuously throughout the entire length of said base fabric.

4. A method of producing and installing a pin seam felt on a papermaking machine, comprising the steps of forming a base fabric by interweaving first machine direction yarns and cross direction yarns, forming interdigitated loops at the ends of said fabric joined by a pin to provide a pin seam joint, applying a group of second machine direction yarns separate from said first machine direction yarns to a face of said fabric and extending said second machine direction yarns continuously across said pin seam joint, needling a batt of fibrous material to said face to intertwine said fibrous material with said second machine direction yarns and said base fabric, cutting the batt and said second machine direction yarns transversely at a location spaced from said joint, separating a portion of the batt and said yarns extending from said location to adjacent said joint to provide a batt flap, and removing said pin from said loops to enable said felt to be opened.

5. The method of claim 4, wherein said step of applying said second machine direction yarns comprises interweaving said second machine direction yarns with said cross yarns.

7. The felt of claim 5 wherein said machine direction yarns are formed of a synthetic material.

8. The felt of claim 4 wherein said machine direction yarns extend continously throughout the length of said base fabric.

6. A papermakers felt comprising, a woven base fabric with the ends of the base fabric having interdigitated loops, a pin disposed in the loops to form a pin seamed joint, a plurality of machine direction yarns disposed on a face of said fabric and extending continuously across said joint, a batt of fibrous material needled into said base fabric and into said machine direction yarns, said batt and said yarns being slit transversely at a location spaced from said joint, the portion of the batt extending between said slit and said joint constituting a separable flap, a portion of said machine direction yarns being integrally attached to said flap and separable from said base fabric with said flap, and means for adhering the flap to said base fabric.

9. The felt of claim 6, wherein said base fabric is composed of interwoven warp yarns and weft yarns, said machine direction yarns being interwoven with said weft yarns.

10. A papermakers felt comprising, a woven base fabric with the ends of the base fabric having interdigitated loops, a pin disposed in the loops to form a pin seamed joint, a plurality of machine direction yarns disposed on a face of said fabric, said yarns extending continuously throughout the length of said base fabric and disposed across said joint, a batt of fibrous material needled into said base fabric and into said machine directional yarns, said batt extending continuously throughout the length of said base fabric and being slit transversely, said slit being at an acute angle to said face of said fabric and being spaced in the machine direction from said joint, the portion of the batt extending between said slit and said joint constituting a separable flap, the portion of the machine direction yarns disposed between said slit and said joint being integrally connected to said flap and separable from said base fabric with said flap.

11. The felt of claim 10, and including means for retaining said yarns in spaced relation on said base fabric prior to needling said batt to said base fabric.