JP2001300385A - Liquid feed head for curtain coater and manufacturing method of liquid feed head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a liquid feed head for curtain coater which is free from thermal expansion in the small change of temperature and manufactured highly accurately while maintaining corrosion resistance. SOLUTION: A head main body 7 and a lip 8 in the liquid feed head 3 for making to flow out a coating color are made by separately working a martensite based stainless steel of the same material used as a base material. The head main body 7 has a flow passage for a coating color 7b inside and a lip attaching part 7a for attaching the lip 8 inside the tip part. The lip 8 is attached to the lip attaching part 7a of the head main body 7 to be integrated with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply head for a curtain coater used in a step of applying a coating liquid to a base paper produced in a paper mill, and a method of manufacturing the liquid supply head.

[0002]

2. Description of the Related Art Paper manufactured in a paper mill is not immediately used as it is, but may be used as a base paper for further processing to obtain a processed paper as a product meeting a required purpose. Many. There are various types of processed paper, one of which is coated paper. Coated paper is
It is manufactured by applying a coating color (coating liquid) on the surface of paper, and a curtain coater is known as an apparatus therefor.

As schematically shown in FIG. 2, a curtain coater is wound around a coater roll 1, and is supplied to a surface of a base paper 2 which travels slightly upward from the coater roll 1 toward the downstream. A coating color 4 as a coating liquid is caused to flow down in the form of a uniform curtain 4a by a head 3 so that the coating color 4 is directly applied to the surface of the base paper 2 or as shown in FIG. Thus, the coating paper 4 is curtained from the liquid supply head 3 onto the surface of both (or one) applicator rolls 5 by passing the base paper 2 between the pair of applicator rolls 5 arranged horizontally and in parallel. 4a
In some cases, the coating color 4 on the roll surface is applied to the surface of the base paper 2. In FIG.
Reference numeral 6 denotes a guide roll disposed downstream of the flow-down position of the coating color 4, and 9 denotes a color pan for collecting the coating color 4 flowing down from the width end of the base paper 2 at the time of coating.

As described above, the liquid supply head 3 serving as a curtain forming section for causing the coating color 4 to flow out in the form of a curtain 4a and apply it to the surface of the base paper 2 or the applicator roll 5 is provided by the curtain 4a. Since the state directly affects the product quality, particularly high processing accuracy is required.

For this reason, the liquid supply head 3 receives the coating color 4 and flows it to the leading end in order to allow the coating color 4 to flow out into a wide curtain with a uniform thickness. The two lips 8 are attached to the inside of the tip of the main body 7 at a small interval and are attached in parallel.
Many types have been adopted in which the coating collar 4 fed into the inside is rectified between two lips 8 to flow out as a thin and uniform curtain 4a.

As the material of the head body 7 and the lip 8 of the conventional liquid supply head 3, SUS304, which is mainly austenitic stainless steel, is used, and the head body 7 and the lip 8 are manufactured by machining. However, when the lip 8 is required to be processed with particularly high processing accuracy, as shown in an example in FIG. The lip base material 8A is placed on the working table 10. Further, the longitudinally required interval position on the upper surface of the lip base material 8A is pressed by a chuck fitting 12 called Matsuba, and the lip base material 8A is The lip 8 is formed by pressing the tip of the lip base material 8A fixed in this way into a required shape with a grindstone 14.

[0007]

However, the austenitic stainless steel SUS304 used as the material of the above-mentioned conventional liquid supply head 3 has a thermal expansion coefficient of 17.3 × 10 ⁻⁶ / ° C. at room temperature. In addition, even if the temperature, room temperature, and the like of the coating color 4 slightly change, there is a problem that the profile of the curtain 4a is disturbed due to thermal expansion. Further, although SUS304 has the property of being soft and tenacious, it is difficult to perform the processing, and particularly, it is difficult to obtain the precision of the lip 8. Therefore, the SUS 304 is formed by using the chuck fitting 12 as a holding means when processing the lip 8. As shown in FIG. 4, the lip base material 8A is pressed and fixed to the processing table 10 by the chuck fitting 12, but there is a problem that distortion occurs in the lip base material 8A.

Accordingly, the present invention provides a method for maintaining corrosion resistance,
An object of the present invention is to provide a liquid supply head for a curtain coater and a method of manufacturing the liquid supply head, which can maintain a profile of a curtain with respect to a slight temperature change and obtain high processing accuracy.

[0009]

According to the present invention, in order to solve the above problems, a lip made of martensitic stainless steel is attached to the inside of the tip of a head body made of martensitic stainless steel. Configuration.

The liquid supply head made of martenside stainless steel has corrosion resistance, and does not deform due to thermal expansion even with a slight temperature change, and can be processed with high precision. It is possible to realize a coating color curtain profile with higher accuracy.

The head body is formed by processing a base material made of martensitic stainless steel so as to have a flow path of a coating collar inside and a lip mounting portion inside the front end portion. The base material of the lip to be attached is made of martensitic stainless steel, and the base material of the lip is processed by being sucked and held by a magnet type holder to form a lip, and the lip is attached to the lip mounting portion and integrated. When the liquid supply head is manufactured in this manner, a liquid supply head with high accuracy can be easily manufactured without using a conventional chuck fitting.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 (a) and 1 (b) show an embodiment of the present invention. Like the liquid supply head 3 shown in FIGS. The liquid supply head 3 for a curtain coater, in which two lips 8 processed with high precision are integrally attached to allow a coating color to flow out in a curtain shape, has a corrosion resistance and a heat resistance. As a material having a small expansion coefficient and good workability, martensitic stainless steel (C-0.02% Si-0.12%
Mn-0.5% P-0.011% S-0.05% Ni-
(4.99% Cr-16.10% Mo-1.18%). That is, martensitic stainless steel is a magnetic material in addition to the above properties,
The head body 7 and the lip 8 are separately processed and manufactured, and the head body 7 has a flow path 7b of a coating color inside by performing required processing on a base material of martensitic stainless steel. The lip 8 is manufactured by processing a base material of martensitic stainless steel while having a lip mounting portion 7a communicating with the flow path 7b of the coating collar on the inner side of the distal end portion. In the liquid supply head 3 that requires high precision, in particular, the lip 8 requires precision processing, but since the martensitic stainless steel used as the material is attached to the magnet, use a magnet as a support base during processing. Can be. For this reason, both when processing the head body 7 and when processing the lip 8, the magnet type holder is placed on the processing table and the base material is magnetically chucked to perform the processing. Now, as an example, when processing the lip 8, as shown in FIG. 1 (b), a magnet type holder 15 is mounted on a processing table 10, and a lip base material 8 B is placed on the magnetic type holder 15. It is manufactured by being held in a state of being adsorbed and being processed by a grindstone 14.

The magnet type holder 15 has a lip 8
Since the base material 8B can be attracted by a magnetic force, the upper surface may be flattened and the base material 8B may be simply placed. However, as shown in the figure, the positioning stopper piece 15a is protruded from the rear end to form an L-shaped section. It may be fixed on the processing table 10 for which horizontal accuracy is given.

When the head body 7 and the lip 8 are manufactured and processed using martensitic stainless steel, the two lips 8 are attached to the lip mounting portion 7a inside the tip end of the head body 7.
And are mounted and integrated so that a flow path of a required width is formed between the lips 8.

In the above description, since the martensitic stainless steel used for manufacturing the liquid supply head of the present invention has ferromagnetism, a magnet chuck for attracting and holding each base material of the head body 7 and the lip 8 to the magnet type holder is provided. Since it becomes possible, there is no need to press each part in the longitudinal direction with the chuck fitting 12 as in the conventional method shown in FIG. 4, so that the base material is not distorted and the martensitic stainless steel is used. Since steel has high hardness, it can be machined with extremely high precision by exhibiting free-cutting properties. Further, the coefficient of thermal expansion of martensitic stainless steel is 11.0 × 10 ⁻⁶ / room temperature.
° C, and is less likely to thermally expand than austenitic stainless steel, so that the temperature of the coating collar used in the liquid supply head 3 or the room temperature around the liquid supply head 3 may be slightly affected. In addition, it is possible to prevent the curtain profile from being disturbed due to the temperature change.

The magnet holder 15 includes
Needless to say, permanent magnets or electromagnets may be used, and other various changes may be made without departing from the spirit of the present invention.

[0018]

As described above, according to the liquid supply head for a curtain coater of the present invention, a lip made of martensitic stainless steel is attached to the inside of the tip of the head body made of martensitic stainless steel. With this configuration, it is possible to obtain a liquid supply head that has corrosion resistance and a low coefficient of thermal expansion, and therefore does not thermally expand even with a slight temperature change, and flows out in a curtain shape. The martensitic stainless steel base material is processed so that the curtain profile is not disturbed and the head body has a coating collar flow path inside and a lip attachment part inside the tip. The base material of the lip to be attached to the lip mounting portion was made of martensitic stainless steel, and the base material of the lip was suction-held by a magnet type holder. The lip is made by processing in the state, and the lip is attached to the lip mounting portion and integrated to produce a liquid supply head, so that the liquid supply head can be easily and accurately formed without using a conventional chuck fitting. It has an excellent effect that it can be manufactured.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a liquid supply head for a curtain coater and a method of manufacturing the liquid supply head according to the present invention.
(A) is an exploded view of the liquid supply head, and (B) is a schematic view showing a lip processing step.

FIG. 2 is a schematic diagram illustrating an example of a curtain coater.

FIG. 3 is a schematic view showing another example of a curtain coater.

FIG. 4 is a schematic view showing an example of a conventional lip processing step.

[Explanation of symbols]

 Reference Signs List 3 liquid supply head 4 coating color 4a curtain 7 head main body 7a lip mounting portion 7b flow path 8 lip 8B lip base material

Claims (2)

[Claims] 1. A liquid supply head for a curtain coater, wherein a lip made of martensitic stainless steel is attached to the inside of the tip of a head body made of martensitic stainless steel. 2. A head body is formed by processing a base material made of martensitic stainless steel so as to have a flow path of a coating collar inside and a lip mounting portion inside the tip portion, and to form a head body on the lip mounting portion. The base material of the lip to be attached is made of martensitic stainless steel, and the base material of the lip is processed by being sucked and held by a magnet type holder to form a lip, and the lip is attached to the lip mounting portion and integrated. A method for manufacturing a liquid supply head for a curtain coater, comprising: