JPS6244779Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a coater liquid supply device that can be used in a paper coater machine, which is one of the finishing machines in a paper manufacturing machine.

(Prior Art) A paper coater machine, which is one of the finishing machines in a paper manufacturing machine, is a machine that applies a coating liquid to base paper to make base paper for printing. Typical conditions are a base paper basis weight of 70 to 80 g/m ² , a base paper thickness of 70 to 80 μ, and a coating liquid with a concentration of 60 to 65%, consisting mainly of clay and charcoal, with starch and latex added as binders.
solids, with a viscosity of 10 to 1001/sec at a shear rate of
Approximately 2000cp., and machine speed is 500~1000
It is about m/min. Conventionally, there are various types of this coating method, one of which is SDC (short coating method).
The outline of the Dwell Coater will be explained with reference to Figure 2.

The apparatus shown in FIG. 2 comprises a backing roll 1, a liquid supply header 2, a liquid supply chamber 3, a weir plate 4, a pressure tube 5, a blade 6, and a supply pipe 7. Further, the base paper 8 is supported by a backing roll 1, whose surface speed is 500 to 1000 m/min. On the other hand, the coating liquid 9 is supplied from the supply pipe 7, forced into the liquid supply chamber 3, and applied to the base paper 8. In addition, a blade 6 (made of tool steel) is installed on the exit side of the coated paper, and is pressed against the paper by the expansion force of the tube 5 due to air pressure, and the amount of coating is controlled by the linear pressure generated at that time. There is. Incidentally, the excess liquid is allowed to overflow from the gap between the backing roll 1 and the weir plate 4 in order to eliminate air flow and paper dust caused by the rotation of the backing roll.

By the way, in the case of the conventional type, the flow of the coating liquid 9 swirls inside the chamber 3, as shown by the arrow in Fig. 2, and forms a boundary with the supplied liquid, forming a smooth flow. do not have. Therefore, the liquid that has been sheared near the surface of the bucking roll is mixed with the liquid that has not been sheared again, and a liquid with a stable viscosity is not always supplied to the paper, causing problems with coated paper. There were concerns that this would occur.

(Problems to be Solved by the Invention) The present invention attempts to solve the conventional problems such as the inability to supply a liquid with a stable viscosity to paper.

(Means for Solving the Problem) Therefore, the present invention constitutes one wall of a coating liquid supply chamber with an open upper end, and is pressed inward of the chamber by an elastic member, and faces the opposite side. In a coater liquid supply device equipped with a blade that controls the coating liquid thickness on the base paper surface supported by a backing roll by its contact linear pressure, a coating liquid discharge hole is provided below the blade, and a coating liquid discharge hole is provided below the blade. It has a structure in which a pipe equipped with a control valve for controlling the discharge amount of the coating liquid is connected to the discharge hole, and this is used as a means for solving the problem.

(Function) Now, a hole is made below the blade to remove the liquid scraped off by the blade, and the amount of removed liquid is adjusted by operating a valve to control the chamber internal pressure.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In Fig. 1, 1 is a backing roll, 2 is a liquid supply header, and 3 is a backing roll.
is a liquid supply chamber, 4 is a weir plate, 5 is a pressure tube, 6 is a blade, 7 is a supply pipe, 8 is a base paper, 9
is a coating liquid, which is the same as the conventional one shown in FIG.

Next, to explain the difference from the conventional one in Fig. 1, the blade 6 has a round hole H of about 5 to 8 mmφ.
A hole is opened with a pitch of about 20 to 30 mm, a return pipe 10 is connected to this, and a valve 11 for adjusting the internal pressure is attached.

Next, to explain the operation of the embodiment shown in FIG.
The rotation of the bucking roll 1 lifts it up to the blade 6 section. The surplus liquid scraped off by the blade 6 passes through a circular hole H formed in the blade 6 and flows into the return pipe 10. A valve 11 is attached to the piping system to control the flow rate while controlling the internal pressure.

(Effect of the invention) Since the present invention is constructed as explained in detail above, by controlling the return amount with the valve, the internal pressure inside the chamber can be controlled and the flow of the coating liquid can be made smooth, and the flow of the coating liquid can be made constant. A liquid with stable viscosity is supplied, and smooth liquid flow in one direction without generation of vortices is possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a coater liquid supply device showing an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional coater liquid supply device. Explanation of the main parts of the figure, 1... Backing roll, 3... Liquid supply chamber, 5... Pressure tube (elastic member), 6... Blade, 8... Base paper, 9...
...Coating liquid, 10... Return piping, 11... Valve, H... Hole.

Claims (1)

[Scope of utility model registration request] It forms one wall of a coating liquid supply chamber with an open upper end, is pressed inward by an elastic member, and is supported by an opposing backing roll. In a coater liquid supply device equipped with a blade that is controlled by contact line pressure, a coating liquid discharge hole is provided below the blade, and piping is installed with a control valve that controls the amount of coating liquid discharged. A coater liquid supply device characterized in that: is connected to the discharge hole.