JPS5925510Y2 - doctor knife coater - Google Patents

Description

[Detailed description of the invention] This invention is a so-called doctor knife coating device that uses a doctor knife to uniformly and continuously apply paint to the surface of a moving sheet-like material such as a long piece of cloth, non-woven fabric, or paper. It is related to.

2. Description of the Related Art Conventionally, among apparatuses for continuously applying paint to a moving long sheet material to be coated, there are floating knife coaters, blanket knife coaters, knife over roll coaters, and the like, which mainly use a doctor knife.

A long sheet material to be coated to which paint is to be applied continuously is usually a sheet material of a suitable length connected at several places, and therefore there are joints at several places in the sheet material to be coated. There is.

This joint (connection part) is made by sewing, adhesive tape, etc., and the joint part is necessarily thick.

Doctor knife coaters, especially blanket knife coaters, knife-over-roll coaters, etc., which have a support for the coated sheet material on the back side of the coated sheet material, are used to Due to the thickness of the joint, the doctor knife does not pass smoothly, which adversely affects the finished product.

Therefore, the blanket knife coater uses the elastic effect of the blanket, and the knife over roll coater uses a rubber roll or a metal roll wrapped with felt, etc., and uses the elastic effect to prevent the coating from passing through the doctor knife section at the seam. Plans are being made to resolve the problem.

However, in the method that relies on the elastic effect of the support of the sheet material to be coated, the above-mentioned obstacles when passing through the doctor knife part cannot be completely eliminated, and it is difficult to say that particularly thick sheets pass smoothly.

Moreover, the elastic material of the support of the sheet material to be coated, such as rubber or felt, is easily damaged and has a short lifespan, so it must be replaced frequently, which increases the cost of maintaining the apparatus.

The idea of the present invention was developed as a result of extensive studies to solve problems such as slanting in the doctor knife coater, and the novel doctor knife coater of the present invention was completed.

The present invention is an apparatus for applying a desired coating material to a sheet material to be coated by bringing the edge of the doctor knife into contact with the sheet material to be coated moving along a fixed support surface of the sheet material to be coated. This invention relates to a doctor knife coater in which grooves are provided in the width direction of a support surface to which a sheet material to be coated is fixed.

In other words, the present invention provides a fixed support for the sheet material to be coated (
A groove with an appropriate inside provided on the surface corresponding to the edge of the doctor knife of the support (hereinafter referred to as the support) serves as an escape area for the seam of the coated sheet I/material when it passes through the doctor knife part. It is something that does work.

In other words, during continuous coating operations on the sheet material to be coated, the seam of the sheet material to be coated automatically escapes into the groove of the support, and the seam remains in contact with the edge of the doctor knife. It passes under the edge extremely smoothly.

Next, the present invention will be explained in more detail with reference to the drawings.

Fig. 1 is a schematic cross-sectional view showing an example of the doctor knife coater of the present invention, Fig. 2 is a schematic cross-sectional view showing the state of the seam of the sheet material to be coated, and Fig. 3 is the support shown in Fig. 1. FIG. 3 is a schematic cross-sectional view illustrating another form of support.

That is, as shown in FIG. 1, the support 1 fixed to the device stand 6 has a structure in which a groove 2 is provided,
A doctor knife 5 is arranged corresponding to the position.

The sheet material 4 to be coated is conveyed along the surface of the support 1 passing under the edge of the doctor knife 5, and the coating material 7 is applied to the surface of the sheet material 4 to be coated. When the seam 3 passes through the doctor knife part 4, the seam 3 escapes into the groove 2 of the support 1, eliminating the problem of the seam 3 in continuous coating operations.

As shown in FIG. 2, the seam 3 of the sheet material 4 to be coated usually has a thickness D that is nearly twice the thickness d of the sheet material 4 itself.

On the other hand, as a matter of course, during the coating operation, the gap between the doctor knife 5 and the support 1 is set to be approximately equal to the thickness d of the sheet material 4 to be coated.

Therefore, the seam 3 of the sheet material 4 to be coated (thickness, 2d)
It is clear that this becomes an obstacle when passing through the gap between the doctor knife 5 and the support 1.

The present invention solves the above-mentioned problems by using the grooves 2 of the support 1.

Although the doctor knife coater of the present invention has this feature in its support, its form and structure are not particularly limited. It includes various forms such as

However, it is preferable that the surface of the support with which the sheet material to be coated contacts during movement is curved to some extent in order to prevent wrinkles from forming in the sheet material to be coated.

In addition, the material constituting the support body is generally metal, but the surface of the rubber material or metal may be covered with an elastic body such as rubber or felt. In this case, the synergistic effect between the grooves and the elastic body You can also expect

The shape of the groove provided on the support is not particularly limited, but if the width of the groove is extremely large, it will be no different from a so-called floating knife coater, and it cannot be used as a coater with a support. characteristics disappear.

Therefore, the width l of the groove of the support in the doctor knife coater of the present invention must be O<l≦100 mm, preferably O<l≦3Q mm.

The width l of the groove is designed within this range by taking into account the type of sheet material to be coated, the thickness of the joint, the speed of movement, the tension, etc.

The term "doctor knife" as used in the present invention refers to a doctor knife used in ordinary knife coaters, and its edge shape is various, such as round, rectangular, and T-shaped, and includes a so-called bar used in such percoaters.

As explained in detail above, the doctor knife coater of the present invention is a new coating device that eliminates the problem of seams of coated sheets in continuous coating of long sheets to be coated using conventional doctor knife coaters, and is a new coating device that has become a major player in the industry. This is a major contribution.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing an example of the doctor knife coater of the present invention, Fig. 2 is a schematic cross-sectional enlarged view showing the joint of the sheet material to be coated, and Fig. 3 is the support of the doctor knife coater of the present invention. FIG. 2 is a schematic cross-sectional view illustrating. 1...Support body, 2...Groove, 3...
... Seam of sheet material to be coated, 4... Sheet material to be coated, 5... Doctor knife, d...
Thickness of the sheet to be coated, D... Seam thickness of the sheet to be coated, L... Width of the groove.

Claims (1)

[Scope of utility model registration request] A device that applies a desired coating material by bringing the edge of a doctor knife into contact with a sheet material to be coated moving along a fixed support surface, the device applying a desired coating material to the fixed support surface corresponding to the etch of the doctor knife in its width direction. A doctor knife coater characterized by having grooves.