JPS6313269Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a blanket used in a surface pressure nip press of a paper machine.

In recent years, in order to improve the dehydration efficiency of wet paper in the press section of a paper machine, the nip is made by placing the running felt that transports the wet paper on a press roll and pressing the blanket against the press roll from below through a high-pressure means. A surface pressure nip press with an extended section has been developed and put into practical use.

Blankets used for this purpose mainly require (1) the pressure surface to have wear resistance to withstand the severe frictional effects of high-speed running felt under high pressure; It is required to have voids to accommodate moving water. Therefore, this invention was devised to satisfy such requirements, and its purpose was to increase the thickness of the warp threads on the pressure surface (felt contact surface) of the blanket to improve abrasion resistance and tensile strength. In addition to extending the life of the felt, by forming a drainage groove along the length of the blanket by thick warp yarns and thin weft yarns arranged on the pressurizing surface, water released from the felt can be quickly drained through the drainage groove. An object of the present invention is to provide a blanket for a surface pressure nip press of a paper machine, which improves the dewatering efficiency of the press section.

Examples of this invention will be described below with reference to the drawings.

1 is a press roll, and 2 is a traveling felt placed under the press roll, and one or two felts are used.

When there is only one sheet of felt, the wet paper web W is dehydrated between the press roll 1 and one sheet of felt 2.

Further, when two upper and lower traveling felts 2 are used, the wet paper web W is guided between the two upper and lower felts.

A blanket 3 is pressed toward the press roll 1 from the outside of the traveling felt 2. This blanket 3 runs on guide rolls 4 that guide the press roll 1 forward and backward, and on tension rolls 5 that adjust the tension of the blanket.

Reference numeral 6 denotes a pressurizing tool that presses the blanket 3 toward the press roll 1 from the outside of the traveling felt 2, and the pressurizing force is adjusted by adjusting the pressurizing source P. Furthermore, lubricating oil is supplied to the surface of the pressurizing tool 6 to minimize the frictional resistance against the blanket 3. In this case, the blanket 3 is driven by an indirect drive method in which the blanket 3 is driven by the positive drive of the press roll 1.

Note that 7 is a suction box for suctioning and removing water accumulated in the voids on the pressure surface of the blanket and in the drain groove.

The blanket 3 of this invention is made by layering a synthetic resin layer on the inner circumferential surface of an endless net-like base fabric consisting of warps and wefts of synthetic resin filaments, and furthermore, the warp on the side of the net-like base fabric in contact with the running felt is the weft. at least twice the thickness, and the wire diameter is 0.6mmφ
It is made of the synthetic resin filament described above, and has drainage grooves formed along the length of the blanket on the pressurizing surface.

The synthetic resin filaments constituting the net-like base fabric 33 may be polyester or polyamide monofilaments or multifilaments, and it is particularly preferable that the warp threads 32 are polyester monofilaments and the weft threads 31 are polyamide monofilaments.

Regarding the thickness of the warp and weft, the warp 32 on the surface side (felt contact surface side) of the net-like base fabric 33 is the weft 3.
It must be a monofilament with a wire diameter of 0.6 mm or more and at least twice the thickness of 1. This forms a drainage groove 35 along the length of the blanket, and also increases the tensile strength and dimensions of the blanket. Improved stability.

The weave structure of the net-like base fabric 33 is not particularly limited and may be single weave, double weave, or more than one weave, but weft double weave or weft triple weave particularly improves the dimensional stability and wrinkle resistance of the blanket. It is preferable in terms of performance, running stability, and void volume, and the warp density in this case is preferably 12 to 100 warps/5 cm.

The blanket of this invention has a synthetic resin layer 34 integrally layered on the inner circumferential surface of the endless net-like base fabric 33 as shown in FIGS. 2 and 3, and FIG. An example is shown in which a base fabric 33 is used, and FIG. 3 shows an example in which a double-woven net-like base fabric 33 is used.

The synthetic resin layer 34 is coated with an elastomer or liquid material such as polyurethane resin, acrylonitrile butadiene copolymer resin, neoprene resin, etc., on the network base fabric 33 so that the synthetic resin layer 34 has a thickness of 5 mm to 15 mm and a hardness (JIS hardness) of 80 to 90 degrees. It is laminated or coated on the inner circumferential surface and then cured to form an integral layer.

When the blanket 3 is used, it is stretched between the guide rolls 4 so that the net-like base fabric 33 side becomes the contact surface 36 with the traveling felt 2.

As can be seen from the above description, this device is a blanket that is pressed from the outside of a running felt placed on a press roll toward the press roll, and the blanket is layered on an endless net-like base fabric and its inner peripheral surface. The blanket is made of a synthetic resin filament, and the warp on the running felt contact surface side of the net-like base fabric is at least twice as thick as the weft, and the wire diameter is 0.6 mmφ or more, making it difficult to process the blanket. The wear resistance of the pressure surface (felt contact surface) and the tensile strength of the entire blanket are significantly improved, extending the life of the blanket. In addition, drainage grooves are formed along the length of the pressing surface of the blanket, allowing water to move from the wet paper to the felt, and furthermore, water that has separated from the felt can be smoothly drained through the drainage grooves, making it possible to dehydrate the press section. There are advantages such as further improvement in efficiency.

[Brief explanation of drawings]

FIG. 1 is a schematic illustration of a surface pressure nip press for a paper machine using the blanket of this invention, FIG. 2 is a sectional view of the blanket, and FIG. 3 is a sectional view showing another embodiment of the blanket. 1... Press roll, 2... Running felt, 3
... Blanket, 6 ... Pressure tool, 33 ... Reticulated base fabric, 34 ... Synthetic resin layer, 35 ... Drainage groove, 3
6...Felt contact surface.

Claims (1)

[Scope of utility model registration request] A blanket that is pressed from the outside of a traveling felt placed on a press roll toward the press roll, and the blanket is made of an endless net-like base fabric and a synthetic resin layer layered on the inner circumferential surface thereof. The warp on the running felt contact surface of the base fabric is at least twice as thick as the weft, and the wire diameter is
Made of synthetic resin filament with a diameter of 0.6 mm or more,
Blanket for surface pressure nip press of paper machine.