JPS6138956Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pressure belt used in a wide 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, a running felt that conveys the wet paper is hung over a press roll, and a pressure belt is pressed against the press roll from below using a high-pressure pressurizing means. A wide nip press with an extended nip section has been developed and put into practical use.

The pressure belt used for this purpose has (1) a pressure surface that has a high degree of wear resistance that can withstand the severe frictional effects of high-speed running felt under high pressure;
and (2) the pressurizing surface is required to have voids to receive water that moves from the felt during pressing.

This invention has been made to satisfy the above-mentioned requirements, and its object is to provide a pressure belt for a wide nip press of a papermaking machine which extends the life of the belt by improving the wear resistance of the pressure surface (the surface in contact with the felt) and also improves the dewatering efficiency of the press section by forming gaps on the pressure surface for receiving water released from the felt.

Examples of this invention will be described below with reference to the drawings. 1 is a press roll, 2 is a running felt hung on the underside of the press roll 1, 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. 3
is pressed toward the press roll 1 from the outside of the traveling felt 2 by a pressure belt. This pressure belt 3 runs on guide rolls 4 that guide the press roll 1 forward and backward, and on a tension roll 5 that adjusts the tension of the belt.
6 is a pressure tool that presses the pressure belt 3 toward the press roll 1 from the outside of the running felt 2;
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 reduce the frictional resistance against the pressurizing belt 3. The pressure belt 3 is driven by an indirect drive method in which it is driven by the positive drive of the press roll 1.

Note that 7 is a suction box for absorbing and removing water in the voids on the pressure surface of the belt.

The pressure belt 3 of this invention has a synthetic resin layer 40 layered on the back side of an endless net-like base fabric 31 made of synthetic resin spiral wire rods 30, and a felt contact surface 50 on the side of the net-like base fabric. It has many voids 34 on its surface. Net-like base fabric 31
A large number of spiral wire rods 30 made of synthetic resin are arranged in parallel in the width direction of the belt, and the adjacent wire rods 30 are interlocked with each other at their respective spiral portions 30', and a connecting core wire of synthetic resin is inserted into the common interlocking hole 32 formed. 33
Enter that. As a result, each wire 30 core wire 33
A net-like base fabric with ends connected by the above is obtained.

In this case, the length of the wire rod 30 is set in advance to a length corresponding to the width of the pressure belt 3, and the number of parallel wire rods 30 connected by the core wire 33 is equal to the predetermined endless length of the belt. The number of pieces is

In this way, a large number of wire rods 30 are connected to create a mesh base fabric with ends of a predetermined length, and when the wire rods 30 at both ends are interlocked and the core wire is inserted into the common hole, an endless mesh base fabric is obtained. Monofilaments such as polyester resin and polyamide resin are used as the material for the synthetic resin spiral wire 30, and polyamide resin is particularly preferred from the viewpoint of wear resistance. As described above, this spiral wire rod 3
The net-like base fabric 31 made from zero becomes a net-like body having a predetermined size, high elasticity, large void volume, dimensional stability, and running safety.

Once the net-like base fabric 31 is formed into an end-shaped shape, a synthetic resin layer 40 is integrally layered on the back side thereof as shown in FIG. 4.

The synthetic resin layer 40 has a thickness of 5 mm to 15 mm and a hardness (JIS hardness) of 80 to 90 degrees. For example, an elastomer or liquid material such as polyurethane resin, acrylonitrile butadiene copolymer resin, or neoprene resin is coated on the network base fabric 31. laminated or coated on the back side. When the pressure belt 3 is used, it is stretched between the guide rolls 4 so that the net-like base fabric 31 side becomes the contact surface 50 with the running felt.

After the synthetic resin layer 40 is layered as described above, both ends of the end-shaped net-like base fabric 31 are joined as described above to obtain an endless belt. 40 is glued with resin so that it is completely continuous without any breaks. Of course, the synthetic resin layer 40 may be layered after forming the net-like base fabric 31 into an endless shape.

As can be seen from the above description, this device is a pressure belt that is pressed from the outside of a traveling felt placed on a press roll toward the press roll, and the pressure belt is made of a net-like base fabric made of synthetic resin spiral wire. Since the synthetic resin layer is layered on the back side, and the net-like base fabric side is the running felt contact surface, the wear resistance of the pressure surface (felt contact surface) of the belt is improved and the life of the belt is extended. During the lengthening process, a large number of voids 34 are formed on the pressurizing surface to receive the water that has separated from the felt, so that the water that has moved from the wet paper to the felt and has also separated from the felt can be smoothly drained. The dewatering efficiency of the parts is further improved. Furthermore, the spiral wires constituting the net-like base fabric can be freely joined to each other, so that it can be easily and easily loaded into a paper machine.

[Brief explanation of the drawing]

Figure 1 is a schematic illustration of a wide nip press for a paper machine using the pressure belt of this invention, Figure 2 is a front view of the spiral wire, Figure 3 is a plan view of a portion of the net-like base fabric, and Figure 4 is It is a sectional view of a pressure belt. 1... Press roll, 2... Running felt, 3
... Pressure belt, 6 ... Pressure tool, 30 ... Spiral wire, 31 ... Net-like base fabric, 33 ... Connection core wire, 34 ... Gap, 40 ... Synthetic resin layer, 50 ...
...Felt contact surface.

Claims (1)

[Scope of utility model registration request] A pressure belt that is pressed from the outside of a traveling felt placed on a press roll toward the press roll, and the pressure belt has a synthetic resin layer layered on the back side of a net-like base fabric made of a synthetic resin spiral wire. A pressurizing belt for a wide nip press of a paper machine, in which the net-like base fabric side is the contact surface with the traveling felt.