JP2010100973A - Canvas cleaning apparatus using steam pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively wash and remove at a low-cost adhesive foreign substances, such as tar and pitch, which stick to the surface of canvas and inside the canvas and are difficult to eliminate by a conventional washing cleaning method. <P>SOLUTION: Adhesive foreign substances are effectively cleaned and removed from the inside of and surface of canvas by sticking to the running canvas a slot surface of steam pipe having a slot for steam spray in the width direction to make the steam penetrate the canvas while the steam is expanded explosively inside the canvas. The apparatus has a more simple structure and can be produced at a lower cost, compared to the conventional apparatus. Utilization of the steam used by a papermaking machine can also reduce the operation cost greatly. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a method of cleaning with the expansion force and high temperature of canvas steam used in a multi-cylinder cylinder dryer in a papermaking machine.

The canvas of a papermaking machine is for promoting the drying of the paper by pressing the paper against the surface of the cylinder dryer. However, when the clogging is caused by the foreign matter contained in the papermaking pulp, the effective drying is inhibited. For this reason, it is indispensable to clean the canvas continuously or periodically to remove foreign substances.
The quality of paper pulp has become more and more foreign with the increasing use of used paper, and the demand for effective cleaning of the canvas has become even stronger.

Currently, a canvas cleaning apparatus that is generally used employs a method of removing foreign substances by spraying 100 to 400 Bar of high-pressure water onto the canvas. In addition to the high-pressure pump, these devices require large facilities such as a collection device for capturing and removing scattered foreign matters and water droplets. Also, high pressure pumps always require maintenance.

Furthermore, since these cleaning apparatuses cannot completely clean and remove foreign substances, it is necessary to use cleaning chemicals in combination.

As a solution to these problems, there are devices that aim to remove foreign substances by injecting high-pressure steam from multiple nozzles into the canvas, but in this method the steam is released to the atmosphere before it reaches the canvas and expands outside the canvas, There is a problem that the expansion force does not function effectively for cleaning the inside of the canvas.
JP 7-48794 A

It is the point which wash | cleans a canvas effectively, reducing the installation cost, the maintenance cost, and chemical | medical agent cost regarding a high pressure water type | system | group washing apparatus which were described in background art.

The steam pipe type cleaning apparatus of the present invention effectively removes and cleans foreign substances adhering to the canvas by allowing the steam sealed in the pipe to explode inside the canvas while penetrating the canvas.

The high-temperature steam softens the sticky foreign matter adhering to the inside of the canvas, such as pitch and tar, and the steam explosively expands and penetrates inside the canvas. Foreign matter can be easily cleaned.

In addition, since the steam used in the present invention is steam generated by a dryer of a papermaking machine, a high-pressure pump requiring high maintenance is unnecessary.

It is explanatory drawing which shows the positional relationship of the component apparatus and canvas of this invention, and the principle of an action | operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain and foreign material collection | recovery hood 2 Steam pipe main body 3 Canvas presser blade 4 Canvas presser and foreign material scraping blade 5, 6 Steam outlet composition blade 7 Rotating brush 8 for cleaning residual foreign matter 8 Drain, foreign matter receiving trough
9 To drain and foreign matter discharge 10 Steam outlet

As shown in Fig. 1, the steam sealed in the pipe explodes inside the canvas by passing through the upper surface of the narrow slot (number 10 in the figure) of the steam pipe (number 2 in the figure). It penetrates the canvas while expanding. Sticky foreign substances such as pitch and tar adhering to the inside of the canvas are also softened by the high temperature of the steam and are ejected to the surface by the explosive expansion force of the steam. Of the ejected foreign matter, the foreign matter remaining on the upper surface of the canvas is removed with a rotating brush (number 7 in the figure) or a scraping blade (number 4 in the figure) and discharged out of the apparatus. The canvas pressing blade (No. 3 in the figure), the scraping blade (No. 4 in the figure) and the blades (Nos. 5 and 6 in the figure) constituting the steam outlet are ceramic blades generally used in papermaking machines. Can be used. In addition, the conventional canvas cleaning device requires a powerful suction device to prevent the cleaning water and the removed foreign matter from scattering, but in this device, the foreign matter is discharged together with the drain water by the power of the expanded steam ( It is also possible to discharge naturally from the number 8) in the figure.

Claims (5)

A canvas cleaning apparatus having a steam pipe having at least one narrow slot in the width direction of the upper surface and blowing off and cleaning foreign matter adhering to the surface and inside of the canvas by the expansion force and high temperature of the steam ejected from the slot. 2. The canvas cleaning apparatus according to claim 1, wherein a plurality of fine vapor ejection holes are provided in the width direction of the upper surface of the steam pipe instead of the slot. 2. The canvas cleaning apparatus according to claim 1, wherein the rotary brush has a rotating brush that effectively scrapes off foreign matters remaining on the surface of the canvas. 2. The canvas cleaning apparatus according to claim 1, having a replaceable blade that constitutes a steam ejection port. 2. The canvas cleaning apparatus according to claim 1, wherein the canvas cleaning device has a replaceable blade for pressing the canvas surface against the steam outlet and scraping off foreign matters remaining on the opposite surface of the canvas.