JPH0975824A - Flexible blade for coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a streak line and fluctuation of coating on a base paper from being generated by laminating and bonding a thin sheet-like coating plate consisting of a high-speed steel on the surface of an elastic thin sheet-like base consisting of a spring steel and making the end part of the thin sheet-like coating plate in the longitudinal direction work as a coating part. SOLUTION: A flexible blade 1 for coating used in a process for applying a coating liq. on base paper is prepd. by laminating and bonding a thin sheet- like coating plate 3 consisting of a high speed steel on the surface of an elastic thin sheet-like base 2 consisting of a spring steel to integrally form them and the end part of the thin sheet-like coating plate 3 in the longitudinal direction is used as a coating part 4. In this case, the coating part 4 is formed of a thick part 5 as a wear part and an inclined face part 6 formed by cutting obliquely. It is possible thereby to prevent a streak line and fluctuation of coating from being generated on base paper and to improve wear resistance with flexibility by using the flexible blade 1 for coating and to easily and inexpensively manufacture it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a coating blade used in a process of applying a coating liquid containing a pigment as a main component to a base paper in a process of manufacturing coated paper. It is.

[0002]

2. Description of the Related Art Conventionally, a coating blade applies a predetermined amount of paint from a paint reservoir to the surface of a base paper passing through the outer surface of a backup roll, and has a thickness of 0.3 mm to 0.8 mm.
Board width is 75mm-150mm, length is 1.500mm-
The one of 7.000 mm is mainly used.

[0003] The coating blade is pressed against the base paper and the backup roll in a bent state, and is mainly formed of a quenched and tempered steel sheet.

[0004] The coating blade is a bevel method in which a portion obtained by diagonally cutting the plate width end in the longitudinal direction is pressed against the coating base paper, and the longitudinal direction of the plate width end upper surface is pressed against the coating base paper. They are roughly classified into venting methods, which are used depending on the amount of paint to be applied, paper type, and type of machine used according to the quality requirements of each user.

[0005] In any case, small portions of the blade material are continuously subjected to rapid and non-uniform wear by the coated base paper or paint running at high speed, and the life is shortened on average from 8 to 12 hours. I have.

Although it is theoretically possible to increase the service life by using a harder metal material which is more wear-resistant than quenched and tempered spring steel, this type of material is not necessarily flexible. Is not sufficient, and the sheet is so thin that it is extremely brittle and easily broken.

Therefore, the life of the coating blade is extended,
For the purpose of increasing the durability and reducing the number of blade replacements during the production of coated paper to achieve long-term operation stability, for example, as disclosed in JP-A-59-88995,
Some blade surfaces are coated with a ceramic material or the like by thermal spraying. However, this coating blade
3 to 5 compared to conventional spring steel blades
Although it can achieve twice the life, it is missing due to brittleness and porosity, which are unique properties of ceramics, and the ceramic material has a high melting point (thousands of degrees) and a single thermal spray of 10μ.
Due to the restriction that the blades can be formed only to a certain degree, problems such as deformation of the blade itself and internal loss due to multi-layering are likely to occur.

Further, the above-mentioned ones have a problem that repolishing is necessary for maintaining flatness and smoothness as a coating blade.

As a method other than the method of coating by spraying a ceramic material or the like, for example, Japanese Patent Laid-Open No. 3-64
No. 595, by coating a part of the surface of the coating blade with hard chrome plating,
Although it is possible to obtain a life of 3 to 5 times as long as that of a conventional blade, this method uses microcracks, which is a property inherent in chrome plating, in the initial stage on the coated paper surface. There is a problem that streaks may occur in the plating, or the thickness of the plating layer due to the electrodes, which is essential for the electroplating method, may cause coating unevenness. It produces a large amount of paper, which is very uneconomical and not completely satisfactory.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to the generation of streaks on the base paper due to the above-described lack of coating due to brittleness, imperfection due to porosity, and minute cracks, and the occurrence of coating unevenness due to variations in plating thickness. It can be easily and inexpensively manufactured without causing streaks and coating unevenness on the base paper, and has the flexibility with greatly improved abrasion resistance. It is an object to provide a coating blade.

[0011]

A flexible coating blade according to the present invention has a thin plate-shaped coating plate made of high-speed tool steel on the surface of an elastic thin plate-shaped substrate made of spring steel. The thin plate-shaped coating plate is formed integrally by being superposed and joined, and the longitudinal end portion of the thin plate-shaped coating plate serves as the coating portion.

The coating portion of the flexible coating blade according to the present invention has a slope formed by cutting a thick portion as a wear margin and an oblique cut at a longitudinal end of the thin coating plate. And a department.

In the coating blade having flexibility according to the present invention, a thin coated plate made of alloy tool steel is overlapped and joined to the surface of an elastic thin plate made of spring steel to form an integral body. The thin coating plate is provided with a coating portion including a thick portion as a wear allowance and a slope portion formed by cutting diagonally at the longitudinal end of the thin coating plate.

[0014]

1 to 3 show an embodiment of a flexible coating blade according to the present invention. FIG. 1 shows a flexible coating blade according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a coating blade having flexibility according to a second embodiment of the present invention, and FIG. 3 is a cross-sectional view of a coating blade having flexibility according to a third embodiment of the present invention. FIG. 2 is a cross-sectional view of a coating blade having the following.

In FIG. 1, reference numeral 1 denotes a flexible coating blade, which is a thin plate made of high-speed tool steel on the surface of an elastic thin plate substrate 2 made of spring steel. The plate-shaped coating plates 3 are superposed and joined together to be integrally formed, and the end portions in the longitudinal direction of the thin plate-shaped coating plates 3 are coated parts 4.
It has been.

The coating portion 4 of the coating blade 1 is composed of a thick portion 5 as a wear allowance and an inclined surface portion 6 formed by obliquely cutting the thin plate-shaped coating plate 3 in the longitudinal direction. Has been done.

The flexible coating blade 1 according to the second embodiment of the present invention shown in FIG. 2 has a thin plate-shaped substrate 2 made of high-speed tool steel on the surface of a thin plate-shaped substrate 2 made of spring steel and having elasticity. A coating plate 3 is integrally formed by being superposed and joined, and a coating portion 4 at a longitudinal end of the thin coating plate 3 pressed against a coating base paper is a slope formed by cutting diagonally. Part 6
The structure does not have.

A flexible coating blade 1 according to a third embodiment of the present invention shown in FIG. 3 is a thin plate-shaped coating made of alloy tool steel on the surface of an elastic thin plate-shaped substrate 2 made of spring steel. The work plate 8 is superposed and joined to form an integral body,
A thin plate-shaped coating plate 8 has a coating portion 4 including a thick portion 4 serving as a wear allowance and a slope portion 5 formed by obliquely cutting the end portion in the longitudinal direction.

In the above-described first, second and third embodiments, the thin coated plate 3 made of high-speed tool steel and the thin coated plate 7 made of alloy tool steel are coated. The entire surface of the working blade 1 in the width and length thereof is superposed on the surface of the thin plate-shaped substrate 2 made of spring steel and joined by an adhesive such as epoxy resin to form an integral structure. Further, the thin plate-shaped substrate 2 may be spring steel which has been subjected to a quenching process.

The thin plate-shaped substrate 2 made of spring steel and the coated plate 3 made of high-speed tool steel are overlapped and joined to be integrated, and the thin plate-shaped substrate 2 made of spring steel and alloy tool steel are formed. Lamination and joining of the coated plate 7 to form an integral body are not limited to bonding, but include a thin plate-shaped substrate 2 made of spring steel and a coated plate 3 made of high-speed tool steel or alloy tool steel. The thin coated plates 7 may be overlapped and integrated by hot pressing or may be integrated by joining by normal temperature pressing. Further, the thin plate-shaped substrate 2 made of spring steel and the coated plate 3 made of high-speed tool steel or the thin plate-shaped coated plate 7 made of alloy tool steel are overlapped and integrated by gas welding, arc welding or thermite welding. Alternatively, they may be integrated by overlay welding such as stellite welding.

The coating blade 1 applies a predetermined amount of paint to the surface of the base paper in a state where the coating blade 1 is bent with respect to the base paper (not shown) and the backup roll (not shown). The coating part 4 of the coating plate 3 having the contact directly contacts the base paper or the paint.

The thin plate-shaped substrate 2 made of spring steel and the coated plate 3 made of high-speed tool steel are joined and formed integrally over the entire width and length of the coating blade 1. The joining portion 8 of the coating blade plate 1 is frictionally applied to the coating portion 4 of the thin coating plate 3 generated in the process of applying the paint to the base paper by pressing the base paper against the backup roll by the above-described joining means. They are firmly joined so that they have sufficient joining strength against force. The joining of the thin plate-shaped substrate 2 made of spring steel and the thin plate-shaped coated plate 7 made of alloy tool steel is also performed by joining the thin plate-shaped substrate 2 made of spring steel and the thin plate-shaped coated plate 3 made of high-speed tool steel. It goes without saying that it is firmly joined as well.

The high-speed tool steel or alloy tool steel, which is the material of the thin coating plate 3 of the flexible coating blade 1 according to the present invention, is the material of the coating blade 1 by the present inventor. Was selected based on the results of the tests conducted to select Then, according to Table 1 showing the test results, the wear amount of the high speed tool steel is 5 times the wear amount of the spring steel which is the base plate 2, and the wear amount of the alloy tool steel is the wear amount of the spring steel which is the base plate 2. It shows abrasion resistance 3.2 times as much as the amount.

[Table 1]

The abrasion of the coating blade is accelerated by the components contained in the coating material, especially inorganic materials, while continuously contacting the base paper, and the abrasion of the coating portion of the coating blade is promoted. Have been. And, as the inorganic component used in the pigment of the paint, clay, talc, calcium carbonate, satin white, titanium dioxide, aluminum hydroxide and the like are typical, and depending on the performance required for coated paper, At present, each pigment is selectively mixed.

Therefore, in selecting the material for the coated plate of the coating blade, a comparative test of the amount of wear was performed as described above. However, in the test, it was necessary to mix the paint in a state close to the actual condition. A test was conducted using paints having the formulations shown in Table 2.

In the above test, the surface of various materials was polished, then immersed in the above pigment and fixed, and the mating material was wood, which is also a raw material of paper, and a load of 1 kg was applied thereto.
The amount of wear after time was compared.

[Table 2]

When heat treatment is performed to impart spring properties, the coating blade becomes thin and easily cracked.
Since the heat treatment becomes complicated and the material becomes expensive and uneconomical, in the present invention, in order to supplement the spring property of the high-speed tool steel that has not been heat-treated, a high-temperature steel that has not been heat-treated has to be used. The speed tool steel and spring steel are overlapped and joined to form a single piece, which allows the use of a thin material with good wear resistance, and is free from defects due to brittleness, such as chipping due to brittleness, micro-cracking, and uneven plating. A coating blade having flexibility was obtained.

Further, in the present invention, in order to complement the spring property of the alloy tool steel not subjected to the heat treatment, the alloy tool steel not subjected to the heat treatment and the spring steel are integrally formed by overlapping and joining. By doing so, a thin material having good abrasion resistance can be used, and a coating blade having flexibility that is free from defects due to brittleness such as chipping, minute cracking, and uneven plating can be obtained.

[0029]

The coating blade having flexibility according to the present invention cannot be solved by the prior art.
This has the effect of eliminating streaks and coating unevenness occurring in the base paper, significantly improving the abrasion resistance while having flexibility, and also enabling easy and inexpensive production.

[Brief description of drawings]

Each drawing is for describing an embodiment of a coating blade having flexibility according to the present invention.

FIG. 1 is a cross-sectional view of a coating blade according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a coating blade according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a coating blade according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Coating Blade 2 Thin Plate Substrate 3 Thin Plate Coating Plate Made of High Speed Tool Steel 4 Coating Part 5 Thick Part 6 Slope 7 Thin Plate Coating Plate Made of Alloy Tool Steel 8 Joining Part

Claims (3)

[Claims] 1. A thin coated plate made of high-speed tool steel is superposed and joined integrally on the surface of an elastic thin substrate made of spring steel, and the longitudinal direction of the thin coated plate. A coating blade having flexibility, characterized in that a direction end portion is a coating portion. 2. The coating portion comprises a thick portion serving as a wear allowance and a slope portion formed by cutting obliquely at an end portion in the longitudinal direction of a thin plate coating plate. A coating blade having flexibility as described in 1. 3. A thin plate made of alloy tool steel is overlapped and joined to a surface of a thin plate made of spring steel and having elasticity, and is integrally formed, and a longitudinal direction of the thin plate is formed. A coating blade having flexibility, comprising a coating portion comprising a thick portion as an abrasion allowance and an inclined portion formed by cutting diagonally at an end portion.