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
  • 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
  • D21F7/10—Seams thereof

Definitions

• the present invention relates to a seam felt for papermaking and a method for producing the same.
• press felt for papermaking is desired to have high water permeability.
• the most popular type of press felt is one that has improved water permeability due to the woven structure of the foundation being composed of single yarn.
• a press cloth that can be spliced on a machine see, for example, JP-T-2004-51 2441
• a strip made of batter and a mouth-resistant material is used as a cloth for a paper machine. So that the permeability of air and water at the seam of the press fabric is substantially the same as the permeability of air and water at locations other than the seam. There is what I did.
• FIG. 6 is a cross-sectional view in the machine direction of a conventional press cloth 10 ′.
• the press cloth 10 ' has a base cloth 14' which is a monofilament woven cloth, and is connected to the joint region 12 'to be endless on the machine.
• the base fabric 14 ' is a woven fabric comprising machine direction yarns 16' that are weft yarns and direction yarns 22 'that are perpendicular to the machine that are warp yarns.
• the machine direction thread 16 ' forms a splicing loop 18'.
• the joining loop 1 8 ′ becomes a passage for the shaft rod 20 ′, and the joining loop 1 8 ′ and the shaft rod 20 ′ are combined to connect the base fabric 14 ′.
• the strip 24 ' is arranged in the seam region 12' so that its upper side extends 0.5 to 2.0 inches (1.27 to 5.08 cm) long.
• the strip 24 ′ is a ribbon using any one of a woven fabric, a non-woven fabric, and a polymer film, and is driven into the base fabric 14 ′ by needling. Further, the cotton 26 'made of staple fibers is provided on at least one side of the base fabric 14' by a method such as needle punching.
• the present invention provides a paper felt shim felt and a method for producing the same that can improve the hair removal resistance of the flap while keeping the felt physical properties in the vicinity of the shim portion different from other parts. The issue is to provide.
• the present invention relates to a papermaking seam felt having a wet paper side batt layer and a seam portion,
• Sheet-like non-woven fabric pieces broken by needle punching in the wet paper web side bag layer near the shim portion are dispersed within the thickness range of the batt layer
• a seam felt for papermaking wherein at least part of the fibers of the batt layer penetrates the holes of the nonwoven fabric pieces, and the nonwoven fabric pieces are melted by heat and fixed to the fibers of the batt layer.
• the flap layer is cut in the width direction at the position of the shim loop to provide a flap, and the nonwoven fabric pieces are melted by applying heat to the nonwoven fabric pieces dispersed in the batch layer.
• the pieces of the sheet-like nonwoven fabric are dispersed in the thickness direction of the felt, the air / water permeability of the seam portion, the felt physical properties, and the portions other than the seam portion Air permeability of water and felt properties can be approached. Further, according to the present invention, it is possible to effectively suppress the hair loss and detachment of the bat fiber of the flap. As a result, it is possible to provide a papermaking seam felt that improves the quality of the wet paper in the paper making process, is less likely to break the wet paper, and has excellent durability.
• FIG. 1 is a cross-sectional view in the machine direction of a papermaking seam felt before the needle punching process.
• FIG. 2 is an enlarged view of a piece of non-woven cloth, showing a seam felt for papermaking after the needle punching process.
• FIG. 3 is an enlarged perspective view showing the state of the non-woven piece and the bag fiber after the needle punching process.
• Fig. 4 is an enlarged view of a non-woven fabric piece of a papermaking seam felt that has been cut after the needle punching process.
• Fig. 5 is a cross-sectional view in the machine direction showing the seam felt for papermaking after passing through the thermal process, with the nonwoven fabric piece enlarged.
• Fig. 6 is a cross-sectional view of a conventional press cloth in the machine direction.
• FIG. 1 is a cross-sectional view in the machine direction of a papermaking seam felt 10 before undergoing a needle punching process.
• the “machine direction (MD)” is the warp (longitudinal) direction in which the papermaking machine moves the seam felt
• the “machine crossing direction (CMD)” is the seam felt in the papermaking machine. It is a weft (horizontal) direction across the direction to move.
• the base fabric 20 is manufactured by weaving a warp (machine direction yarn) 22 and a weft (cross-machine direction yarn) 24 on a loom.
• seam loops 2 3 and 2 3 are provided on the warps 2 2 and 2 2.
• the seam loops 2 3 and 2 3 are aligned in the cross machine direction. Then, by inserting a rod-shaped core wire (pintle wire) 26 into the seam loops 23, 23, the base fabric 20 becomes an endless endless fabric.
• the seam felt 10 is made into a papermaking felt by entwining the bat layer 30 made of the bat fiber 3 2 on both sides of the base fabric 20 by 21 dollar punching.
• a single-layer or multi-layer sheet-like nonwoven fabric 40 is disposed inside or on the surface of the bat layer 30 at the seam portion 12.
• the sheet-like non-woven fabric 40 should be provided over the entire width of the seam loop ⁇ ⁇ 10 along the cross-machine direction on the side of the seam loops 2 3 and 2 3 in contact with the wet paper.
• the length of the sheet-like nonwoven fabric 40 in the machine direction is preferably 1 to 20 cm.
• the sheet-like nonwoven fabric 40 is crushed in the vicinity of the seam portion 12 to become a nonwoven fabric piece 40a. ing.
• the non-woven fabric pieces 40 a are dispersed almost throughout the thickness of the butt layer 30 a in the seam portion 12.
• the non-woven piece 40 a has a hole 41 a.
• the core wires 26 inserted in the seam loops 2 3 and 2 3 of the seam rods 10 b obtained by the needle punching process are pulled out.
• the butt layer 30 b is cut obliquely until reaching the base fabric 20, thereby forming a cut 11.
• the reason for providing the cut 11 so that the upper butt layer 30 b is cut obliquely and inclined in the machine direction is that the butt layer 30 is cut vertically in the cross machine direction. This is because the seam mark is more difficult to transfer to the wet paper. Therefore, the lower cut 1 1 'may be in the vertical direction.
• the portion forming a triangle with respect to the base fabric 20 with the cut line 11 as the hypotenuse is the flap f.
• the traveling direction of the seam felt 10 b on the papermaking machine is from the right to the left in FIG.
• the core wire 26 is again passed through the seam loops 2 3 and 2 3, and the endless seam felt 10 b is placed between a pair of rolls (not shown).
• the seam felt 1 O b is hot-pressed by a heat source (not shown) and a press roll provided between the pair of rolls.
• the nonwoven fabric piece 40 a is melted by the hot pressing process, so the nonwoven fabric piece 40 c obtained thereby is a warp yarn 2 2, a weft yarn 2 4, and a bat fiber 3 2. It adheres to the point of contact with and the part where the bat fibers 32 are in contact. In this way, the loss of hair and loss of the bat fibers 3 2 in the flap f without impairing the air / water permeability and physical properties (compressibility, water permeability, accumulation of dirt components) of the seam 1 2. Can be effectively suppressed.
• the core wire 26 is removed from the endless seam felt 10 0 c seam loops 2 3 and 2 3, and the shim felt 1 0 c is made into an end, and thus the seam felt 1 0 c Packed and shipped in a rolled state.
• a looped shim felt 10 c is hooked from one end, circulates between the rolls on the papermaking machine, and then the seam loop 23 at one end and the other end
• sheet-like non-woven fabric 40 used in the present invention a sheet-like fiber assembly made of filaments or stables produced by a method such as spun pond, melt blow, or spun lace is suitable.
• the sheet-like nonwoven fabric 40 is well dispersed in the needle punching process.
• the sheet-like nonwoven fabric 40 is relatively light. Therefore, it is preferable to arrange a plurality of sheet-like nonwoven fabrics 40 having a basis weight of about 12 g Zm 2 .
• the material used for the sheet-like nonwoven fabric 40 has a lower melting point than nylon, polyester, aromatic nylon, polyester, polyester ester, etc. constituting the base fabric 20 and the batt layer 30, for example, the melting point is 1 Nylon copolymerized with 20 to 18 Ot, copolymerized polyester, and polyolefin are preferred.
• the air / water permeability and felt physical properties of the seam portion can be made closer to the air, water permeability and felt physical properties of portions other than the seam portion,

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• 2005
  • 2005-07-25 JP JP2005213763A patent/JP4921736B2/ja active Active
• 2006
  • 2006-07-11 TW TW095125214A patent/TW200710307A/zh unknown
  • 2006-07-24 EP EP06768373A patent/EP1918453A4/en not_active Withdrawn
  • 2006-07-24 WO PCT/JP2006/315064 patent/WO2007013631A1/ja active Application Filing
  • 2006-07-24 CA CA002616527A patent/CA2616527A1/en not_active Abandoned
  • 2006-07-24 BR BRPI0613856-0A patent/BRPI0613856A2/pt not_active Application Discontinuation
  • 2006-07-24 US US11/989,250 patent/US20090133774A1/en not_active Abandoned
  • 2006-07-24 CN CNA2006800265557A patent/CN101228313A/zh active Pending

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