JPH06280181A - Method for forming lubricating film on dryer surface of paper machine by scattering solid lubricant, liquid spraying apparatus and solid lubricant to be used therefor - Google Patents

Abstract

PURPOSE:To provide a method for forming a lubricating coating film on the surface of the dryer of a paper machine, a spraying apparatus therefor and a solid lubricant to form the lubricating coating film on the surface. CONSTITUTION:A solid lubricant supplied from a chemical liquid tank and air supplied from an air controlling part are introduced into a nozzle unit 24 through a liquid pipe and an air pipe built in a cable bear 12 and mixed with each other in a nozzle of a spray unit 18 extended in the sprayer main body 27 placed at a distance of >=5cm from the surface of a dryer. The mixture is atomized from the spraying hole 29 at the center of a cap 20 by the ejection pressure and the mist of the lubricant is sprayed to the surface of a paper machine dryer while traversing the nozzle unit 24 to form a lubricating coating film on the dryer of the paper machine. The chemical liquid spraying apparatus is composed of the chemical liquid tank 3, accessory apparatuses, the cable bear and a timing belt 14 or a caterpillar chain. The solid lubricant is composed of a solid lubricant, a dispersing agent, a binder and water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a lubricating coating on the surface of a paper machine dryer, a spraying device used for the method, and a solid lubricant for forming a lubricating coating on the surface. In the above, the film for improving the smoothness and lubricity of the drum surface of the dryer improves the releasability of the paper and prevents the stain by the chemical coating product.

[0002]

2. Description of the Related Art Recently, in the paper manufacturing industry, since the use of used paper, the quality of paper, and the functionalization are advanced, impurities including
Chemicals and coating liquids tend to increase. As a result, problems such as poor peeling of paper, dirt on the surface of the drum, and the generation of paper dust have become more frequent.

In order to treat such complaints, there is a method in which a release agent is internally added to the paper-making raw material so that the surface of the dryer has a release property. However, not only the cost of the internal addition chemicals is high, but also the effect of fixing the chemicals is small. ， When a large amount of internal additives is used,
Not only wastewater pollution, but also equipment pollution, foaming, etc., caused many problems such as manufacturing liability, high cost, and quality deterioration.

Particularly, in the internal addition method, since the surface of the dryer is not protected, the dryer is considerably worn, and it is necessary to periodically polish the surface of the dryer.

An external addition method of a releasing agent is to spray a releasing agent on the surface of a drier or wet paper to control the peeling on the surface of the drier, and at the same time to form an oily or resin film on the surface of the drier to protect the surface. However, depending on the papermaking conditions, it is not perfect for maintaining quality.

Particularly, in a high-speed machine for producing a tissue, it is difficult to keep the oily and resin film coatings constant during operation, and wear due to metal contact with the doctor blade. Dryer surface polishing is performed once or twice a year because of secondary abrasion due to blade abrasion powder, physical abrasion such as foreign matter and paint mixed in wet paper, and chemical abrasion such as corrosion due to added chemicals. It is the current situation.

Further, a method of coating a fluororesin on the surface of the dryer has been adopted in order to provide the surface of the dryer with a peeling property, but the drying is deteriorated.
It has the drawback of not being able to use a doctor.

[0008]

DISCLOSURE OF THE INVENTION The present invention not only solves the disadvantages of high cost and low thermal efficiency brought by the prior art, but also improves the peelability of the drum surface and prevents stains and paper dust generation. Is proposed for.

[0009]

DISCLOSURE OF THE INVENTION The present invention proposes a method, an apparatus and a medicine which can solve the drawbacks of the prior art and efficiently improve the quality in a dryer.

[0010]

The solid lubricant delivered from the chemical liquid tank 3 equipped with the pump 2 with the flow rate controller 1 and the air delivered from the air control unit 10 will be described in detail below with reference to the drawings. The spraying device main body 2 which is sent to the nozzle unit 24 through the pipe 13 and the air supply pipe 15 and is installed at a distance of 5 cm or more from the dryer surface
The solid lubricant mixed by the nozzle 19 of the spray unit 18 traveling in the inside of 7 and atomized by the discharge pressure from the spraying port 29 at the center of the cap 20 is sprayed while moving the nozzle unit 24 to the surface of the paper machine dryer while moving the nozzle unit 24. It forms a lubricious coating on the surface of the dryer.

The chemical liquid spraying device includes a chemical liquid tank 3 of a pump 2 with a flow rate adjusting device 1, a solenoid valve 8 for sucking air through a valve 6 and adjusting air delivery by a pressure reducing valve 7, and a speed adjusting dial 9. An accessory device composed of the air control unit 10, a cable carrier incorporating the liquid supply pipe 5 of the chemical liquid tank 3 and the air supply pipe 11 of the air control unit 10,
The chemical liquid spraying device is composed of a timing belt or a caterpillar chain that drives the nozzle unit.

Solid lubricants include molybdenum disulfide,
Solid lubricants such as tungsten disulfide, graphite, graphite fluoride, calcium fluoride, fluororesin, polytetrafluoroethylene, melamine cyanurate, boron nitride, and polyamide 3%, acrylic amide, sodium acrylate salt, polyhydric alcohol, etc. It is composed of a dispersant of 9%, a small amount of polyamideimide as a binder, and 88% of water, and is sprayed on the dryer surface.

The solid lubricant 3%, the dispersant 9%, a small amount of the binder, and 88% of water are injected by removing the chemical replenishing cap 4 of the chemical liquid tank 3 and starting the speed control motor 25 to rotate the timing gear 17. Then, the spray unit 18 is driven.

The speed of the speed control motor 25 is adjusted by adjusting the speed adjusting dial 9 of the air control unit 10.

The flow rate adjusting device 1 is for adjusting the flow rate of the chemical liquid while grasping the spraying state of the chemical liquid. When the valve 6 and the pressure reducing valve 7 of the air control unit 10 are opened, the air flows through the solenoid valve 8. The air pressure is sent to the air control unit 10, the air pressure is adjusted by adjusting the pressure reducing valve 7, and the air pressure is sent to the nozzle body by the air supply pipe.

The chemical solution was suspended in 3% of solid lubricant, 4% of sodium acrylate salt as dispersant, 5% of polyhydric alcohol, polyamideimide as binder and 88% of water. Solid lubricant 5%, dispersant 11
It has been found that it is optimal to limit it to%.

A sodium acrylate salt or the like is used as the dispersant, but it is used to float the solid lubricant.

Particularly, the polyhydric alcohol is added so that the powder can be easily dispersed.

The chemical liquid and air are mixed in the mixing chamber 28 at the tip of the spray unit 18 which runs in the main body 27 of the spraying device installed at a distance of 5 cm or more from the surface of the dryer and atomized from the spraying port 29 to start ejection. By doing so, a homogeneous chemical solution is atomized and ejected.

The discharge pressure is controlled by adjusting the air pressure adjusting dial 9 of the control unit 10, and the flow rate of the chemical solution sent from the chemical solution tank 3 is also adjusted by the flow rate adjusting device 1. The chemical spray can be adjusted while grasping the formation status of the lubricous film.

The shape of the spraying port 29 provided on the cap 20 at the tip of the nozzle 19 is not limited to a circular hole, but may be changed to an elliptical shape or a horizontally long shape to change the spraying condition. Needless to say.

The spray unit 18 is also connected to the liquid supply pipe 21, the air supply pipe 22, the timing gear 17, and the timing belt 14 so that the spray unit 18 can be slid by the speed control motor 25 accelerated by the speed control dial 9 of the air control unit 10. Has become.

It is also conceivable to use a caterpillar chain instead of the timing belt 14.

Since the spray unit 18 is provided with limit switches 16 and 30 according to the width of the dryer of the paper machine, the spray unit 18 comes into contact with the limit switches and the spray unit 18 automatically reverses its normal point. It reciprocates in the main body 27 of the spraying device installed on the dryer surface.

A screw screw is connected to the motor shaft in the main body 27 of the spraying device, and a limit plate 16, 30 is brought into contact with a limit plate mounted on the screw screw. Can now be adjusted freely.

It goes without saying that the limit switches 16 and 30 can freely adjust the spraying area of the chemical liquid by freely selecting the installation place and mounting them in a wide and narrow manner.

In the present invention, it is also possible to mount a proximity switch instead of the limit switch. In the case of the proximity switch, unlike the limit switch, contact drive is eliminated, so that the solid lubricant is sprayed with the chemical liquid. However, it has become even smoother.

In this way, the surface of the dryer was corrected for damage and became a smooth mirror surface, which resulted in smoothness of the paper surface and improvement in glossiness.

[0029]

INDUSTRIAL APPLICABILITY According to the present invention, a solid lubricant is sprinkled on the surface of a dryer to form a lubricating film on the surface, thereby giving gloss and smoothness to the paper surface and the coated layer surface, and softening the crepe paper, especially the tissue paper. It has become possible to stably manufacture products that have a good feel and generate little paper dust.

That is, the solid lubricant dispersed on the surface of the dryer is mechanically rubbed by the heat of the dryer and sliding on the doctor blade and the paper surface to mechanically rub against the irregularities on the surface of the dryer to form a highly lubricious resin film on the surface. I decided to do it.

The surface of the dryer thus formed has a smooth mirror-like surface and has high lubricity and peelability, so that the paper surface and the coating layer surface are provided with gloss and smoothness.

In particular, the effect was seen on printing paper and coated paper.

Further, in the crepe paper, if the dryer surface has a smooth mirror-like surface, the adhesive force of the wet paper and the peeling force at the time of drying increase, and the resin film having lubricity causes the blade of the doctor blade due to abrasion and sliding resistance. In order to prevent the slight vibration of the crepe, the crepe was made uniform, finer, and had a soft shape with excellent elasticity, and paper dust was also significantly reduced.

Further, the crepe formed by strong adhesion and uniform peeling has a difference in speed between the dryer and the reel,
The crepe rate can be reduced, the reel winding speed can be increased, productivity has improved significantly, and cost reduction has also become possible.

[Brief description of drawings]

FIG. 1 is a schematic view of a spraying device used for carrying out the present invention.

FIG. 2 is an exploded view of a spray unit portion.

FIG. 3 is a detailed view of a pump unit.

FIG. 4 is a detailed view of the operation panel.

FIG. 5 is a drive status diagram of the spray unit.

[Explanation of symbols]

 1: Flow rate control device 2: Pump 3: Chemical liquid tank 4: Chemical liquid supply cap 5: Liquid supply pipe 6: Valve 7: Pressure reducing valve 8: Electromagnetic valve 9: Speed control dial 10: Air control unit 11: Air supply pipe 12: Cable Bear 13: Liquid feeding pipe 14: Timing belt 15: Air feeding pipe 16: Limit switch 17: Timing gear 18: Spray unit 19: Nozzle 20: Cap 21: Liquid feeding pipe 22: Air feeding pipe 23: Rotating reel 24: Nozzle unit 25 : Speed control motor 27: Spraying device main body 28: Mixing chamber 29: Spraying port 30: Limit switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C10N 50:02

Claims (3)

[Claims] 1. A solid lubricant sent from a chemical tank equipped with a pump equipped with a flow rate control device and air sent from an air control section are sent to a nozzle unit by a liquid sending tube and an air sending tube incorporated in a cable carrier, and a dryer surface. While mixing the nozzles of the spray unit that runs in the main body of the spraying device installed at a distance of 5 cm or more from the spraying unit in the center of the cap, the solid lubricant atomized by the discharge pressure is moved to the surface of the paper machine dryer while moving the nozzle unit. A method for forming a lubricious film for a paper machine dryer, which comprises spraying. 2. A chemical solution tank equipped with a pump equipped with a flow rate control device, an accessory device comprising an air control section with a solenoid valve for sucking air through the valve and adjusting air delivery by a pressure reducing valve, and a chemical solution tank. 2. A lubricous coating for a paper machine dryer according to claim 1, which comprises a cable bear incorporating the liquid feeding pipe of the above and an air feeding pipe of the air control section, and a timing belt or a caterpillar chain for driving the nozzle unit. A chemical spraying device used in the method. 3. Molybdenum disulfide, tungsten disulfide, graphite, fluorinated graphite, which are sprayed on the surface of the dryer.
Solid lubricant 3% such as calcium fluoride, fluororesin, polytetrafluoroethylene, melamine cyanurate, boron nitride, polyamide, 9% dispersant such as acrylic amide, sodium acrylate, polyhydric alcohol, polyamide imide as binder A solid lubricant used in the method for forming a lubricious coating for a paper machine dryer according to claim 1, which comprises a small amount of 88% water.