JP4902160B2 - Coating equipment - Google Patents

Abstract

A conveyor belt (gp) is guided across a drum (gp1) to be moved vertically in order to adjust the level of inclination at the surface formed by the belt (gp). An appropriate kind of paint is supplied in the shape of curtains (tac,tbc) from two containers (11,12) positioned behind each other, resulting in two layers guided across the drum (gp1) onto an endless sheet of paper (W), also moved. The angle formed between the belt (gp) and a horizontal axis is of an acute shape. The distance (L1) between the drum (gp1) and the front container (12) is less than a meter.

Description

    The present invention relates to a coating apparatus that applies a plurality of coating materials in multiple layers on one or both sides of a web that is a base paper.

  Conventionally, coated paper used for general printing paper such as catalogs and pressure sensitive paper, thermal paper, automatic ticket gates, etc., is generally coated on the surface of the web as a base paper by a post-weighing coater such as a blade coater. It is produced by weighing after application. A machine for applying such a paint is generally called a coating machine.

  Conventionally, post-metalling methods, ie, blade coaters, rod coaters, air knife coaters, etc., in which coating is performed after coating is once applied on the surface of the web have been the mainstream.

  By the way, in recent years, a curtain-type coating apparatus (pre-weighing type coating machine) that sprays paint from an upper curtain head on a conveyed web to form a paint curtain and applies the paint onto the web surface. ) Is being used extensively.

  In addition, a coating system called a slide die system capable of multilayer coating is also known.

In addition, there exists the following patent document 1 as literature well-known invention in which the curtain type coating apparatus was described.
Japanese Patent Publication No.63-239

    By the way, when two layers of paint are applied on the web surface using the curtain-type coating apparatus described above (see FIG. 4 of Patent Document 1), a paint curtain is formed when the web is conveyed at high speed. The relative speed difference between the coating material dropping speed and the web conveying speed is large, and uneven coating such as madara may occur due to the surface state of the first layer coating material on which the second layer coating material falls.

  In order to solve this problem, two paint curtains ejected from the curtain head are arranged close to each other and applied as one thick paint curtain to prevent uneven coating such as madara. Yes. However, even if the excess paint overflowing from the web surface is collected, the paint is mixed and cannot be reused.

  In addition, in the conventional curtain coating method, since each paint is generally formed by independent curtains, the curtain is easily cut off and unstable in a small flow rate coating, and normal coating cannot be performed.

  In addition, when curtain coating is continuously performed using a plurality of paints, the coating surface is easily affected by the front and rear coating layers because the film thickness when applied is thin. May be rough.

  In order to solve these problems, as shown in FIG. 5A (conceptual side view including a partial cross section), paints tc and td are respectively ejected onto the guide sheet gs to form paint curtains tcc and tcd. Then, a coating machine has been developed that drops and coats the coatings tc and td in multiple layers on the guide sheet gs and applies the multilayer coatings tc and td onto the web w surface.

  By the way, in this coating machine, the lower surface of the first layer of paint tc is in contact with the guide sheet gs in the state of being formed in multiple layers, and the upper surface of the second layer of paint td is on the guide sheet gs while touching the atmosphere. Therefore, the plate angle θ3 and the falling position of the curtain limit the flow of the paints tc and td, and affect the formation of the coating layer on the web w surface.

  For example, in the two-layer coating, slip occurs between the coating layers of the first coating tc and the second coating td on the web w surface, and the second coating td has a scale-like shape. A pattern may occur.

  In addition, as shown in FIG. 5 (b) of the AA line cross-sectional enlarged view of FIG. 5 (a), in the method of applying the second layer of paint td within the web w width, The coating layer td end of the second layer is likely to be thickly coated td1 due to the surface tension during coating, and the thickened web w ends w1 and w1 are wound due to insufficient drying in the drying process. In some cases, the roll may become dirty, and further, winding failure may occur.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating apparatus capable of performing multi-layer coating on a web surface with good quality and preventing coating material from being stained with paint.

In order to achieve the above object, a coating apparatus according to claim 1 of the present invention is a coating apparatus that applies a plurality of coating materials on a web surface to be conveyed, and is disposed at arbitrary intervals. A plurality of curtain heads each ejecting downward, and paints ejected sequentially from the plurality of curtain heads toward the slope are stacked in order as they move on the slope to form a multilayer paint layer. An inclined guide to be formed and a multi-layered coating layer provided on the inclined edge of the inclined guide are formed continuously, and a coating curtain is formed by changing the moving direction of the coating layer on the inclined guide toward the web surface. A transition guide to be moved upward, and the transition guide is rotatable with respect to the tilt guide .

  The coating apparatus according to claim 2 of the present invention is the coating apparatus according to claim 1, wherein the inclined surface of the inclined guide is inclined downward by 10 to 50 degrees toward the web surface with respect to the horizontal plane, and the inclined The distance from the bent edge of the guide to the drop point of the paint sprayed from the most downstream curtain head onto the inclined guide is 0 to 1 m.

The coating apparatus according to claim 3 of the present invention is the coating apparatus according to claim 1 or 2 , wherein the transition guide is in a vertical direction from a bent edge of the inclined guide or in a vertical direction. And inclined to the inclined guide side.

    As described above in detail, according to the coating apparatus according to claim 1 of the present invention, the inclined guide that forms the multilayer coating layer by laminating the coating in order as it moves on the slope, A transition guide that is provided continuously with the bent edge of the inclined surface of the inclined guide, and that changes the direction of movement of the multi-layered coating layer on the inclined guide toward the web surface to form a paint curtain and move to the web surface; Therefore, stable and high quality curtain coating is possible.

  According to the coating apparatus according to claim 2 of the present invention, the flow velocity distribution in each layer of the paint on the inclined guide can be changed to the optimum value, which leads to the improvement of the quality of the coated product.

  In addition, the end of the coating layer applied on the web surface is applied flat without rising, and the quality can be improved.

  According to the coating apparatus relating to the third aspect of the present invention, the transition guide is freely adjustable with respect to the tilt guide. Therefore, the transition guide is adjusted to an optimum angle according to the tilt angle of the tilt guide. Coating.

  According to the coating apparatus according to claim 4 of the present invention, the transition guide is provided in the vertical direction from the bent edge of the inclined guide or inclined to the inclined guide side with respect to the vertical direction. The liquid is easily separated from the liquid and can effectively prevent contamination of the guide due to the paint.

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

  As shown in FIG. 1, the coating apparatus 1 to which the present invention is applied applies a coating ta as a first layer and a coating tb as a second layer in multiple layers on the surface of the web w conveyed in the direction of the arrow α. Device.

  FIG. 2 is a right side conceptual view showing the positional relationship between the tilt guide gp and the curtain heads 11 and 12 shown in FIG.

  As shown in FIGS. 1 and 2, the coating apparatus 1 includes an inclined guide gp having a slope that guides the first-layer paint ta and the second-layer paint tb toward the web w surface in a two-layered state. A first curtain head 11 for spraying the first layer of paint ta downwardly toward the inclined guide gp and forming a paint curtain tac; and a paint for moving the second layer of paint tb on the inclined guide gp. and a second curtain head 12 which forms a paint curtain tbc which is ejected downward toward ta.

  Here, the inclined guide gp is formed to have an inclined surface with an inclination angle θ1 downward from the horizontal plane toward the web w conveyed in the arrow α direction (see FIG. 1).

  The inclination angle θ1, which is the inclination angle of the inclination guide gp shown in FIG. 2 with respect to the horizontal plane, is set to 10 to 50 degrees.

  The first curtain head 11 ejects the paint ta supplied from a pump (not shown) toward the inclined guide gp having an downward inclination, and forms and drops the paint curtain tac. The paint ta falling on the inclined guide gp forms a first coating layer and is guided toward the upper surface of the web w to be conveyed by the inclined surface of the inclined guide gp.

  The second curtain head 12 disposed downstream of the first curtain head 11 ejects the paint tb supplied from a pump (not shown) toward the paint ta on the inclined guide gp and the paint curtain tbc. It is formed and dropped onto the paint ta on the inclined guide gp. The coating tb dropped on the coating ta forms a second coating layer, forms a layer with the coating ta of the first coating layer, and guides it toward the upper surface of the web w conveyed by the inclined surface of the inclined guide gp. Has been.

  The paint tb guided by the inclined guide gp has a width dimension s1 narrower than the width of the paint ta of the first coating layer on the inclined guide gp (see FIG. 1).

  Further, as shown in FIG. 2, from the bent edge gp1 of the inclined guide gp to the drop point gp2 of the paint tb ejected from the second downstream curtain head 12 closest to the bent edge gp1 to the inclined guide gp. The distance L1 is set to 0 to 1 m.

  Further, as shown in FIG. 3 which is an enlarged view of a portion B around the bent edge gp1 of the inclined guide gp in FIG. 2, the paints ta and tb are directed toward the upper surface of the web w continuously from the bent edge gp1 of the inclined guide gp. A transition guide cg to be moved is provided in a vertical direction downward, and the transition guide cg is configured to be rotatable and adjustable with respect to the inclined guide gp as indicated by an arrow β.

  As shown in FIG. 1, the paints ta and tb guided by the transition guide cg fall on the surface of the web w to be transported by forming a two-layered paint curtain tc and move to the web w surface. Two-layer coating is performed.

  Here, even when the inclination guide gp is installed with the inclination angle θ1 changed, the transition guide cg can be adjusted so as to be in the vertical direction as shown in FIG.

  In the case of normal coating, the transition guide cg is adjusted and arranged in the vertical direction from the inclined guide bending edge gp1 toward the web w to be conveyed, as shown in FIG. This is preferable from the viewpoint of preventing contamination of the transition guide cg due to the paints ta and tb.

  On the other hand, depending on the paint, the transition guide cg is located at the position a having a slight inclination angle θ2 from the inclined guide bending edge gp1 toward the inner side of the inclined guide gp with respect to the vertical direction. The liquid separation of the paints ta and tb is good.

  Next, the coating process on the web surface by the coating apparatus 1 having the above-described configuration will be described.

  As shown in FIG. 2, the paint ta is ejected from the first curtain head 11 toward the inclined surface of the inclined guide gp to form a paint curtain tac, and dropped onto the inclined guide gp.

  The coating ta on the inclined guide gp forms a first coating layer, and the upper surface of the web w conveyed on the inclined guide gp as shown in FIG. 1 by the downward inclination (inclination angle θ1) of the inclined guide gp. Guided to move.

  The paint tb is ejected from the downstream second curtain head 12 toward the paint ta moving downward on the inclined guide gp to form the paint curtain tbc, and the paint ta moving on the inclined guide gp. Let fall.

  Then, the paint tb dropped on the paint ta on the inclined guide gp forms a second coating layer as shown in FIG. 1 and forms two layers with the paint ta of the first coating layer. The top is guided and moved toward the upper surface of the web w.

  In this way, as shown in FIG. 1, the paints ta and tb that move by forming two paint layers on the inclined guide gp are transferred from the inclined guide gp to the transition guide cg and conveyed in the direction of arrow α. A coating curtain tc is formed on the upper surface of the web w to be transferred and applied in two layers.

  Here, the paints ta and tb applied on the surface of the web w, as shown in FIG. 4 of the enlarged cross-sectional view of the web w after application, are swelled at the end as in the prior art (FIG. 5B). ) Td1) is formed as a flat coating layer on the surface of the web w, and high-quality coating is performed.

  In this embodiment, the case where coating is performed by arranging two curtain heads has been described as an example. Needless to say.

  According to the above configuration, the paints ta and tb are laminated in order as they move on the slope, and the slope guide gp that forms a multi-layer paint layer and the bent edge gp1 of the slope of the slope guide gp are continuously provided. Provided with a transition guide cg for changing the moving direction of the multi-layered paint layer on the inclined guide gp toward the surface of the web w and forming the paint curtain tc on the web surface w. High quality curtain coating is possible.

  Further, on the contact surface between the paint ta and the inclined guide gp, the restriction of the flow of the paint ta due to the friction coefficient of the inclined guide gp can be improved by changing the inclination angle θ1. The same applies between the multilayer paints.

  Also, by changing the inclination angle θ1, the flow velocity distribution in each paint ta, tb layer can be changed to an optimum value, leading to quality improvement.

  In addition, by changing the position of the paint curtain falling from the most downstream second curtain head 12, that is, the distance L1 (see FIG. 2), it is possible to change the flow of the paint ta and tb, The flow of paint can be corrected. Therefore, as shown in FIG. 4, it is possible to prevent the thickness of the applied paint ta and tb from being maintained.

  Further, since the angle of the transition guide cg can be changed and adjusted so that the tilt angle θ1 of the tilt guide gp can be changed and operated at the optimum angle, the inclination guide gp and the transition guide cg of the paint ta and tb can be changed. The liquid is sufficiently separated from the liquid and the contamination of the inclined guide gp and the transition guide cg by the paint can be prevented as much as possible.

  In this embodiment, the case where the coating materials ta and tb are applied in multiple layers on one side of the web w has been described as an example, but the coating materials ta and tb are applied in multiple layers in the same manner on the other side of the web w. Needless to say, you can.

  In the present embodiment, the case where coating is performed with two curtain heads is described as an example. However, even when coating is performed with an arbitrary number of plural curtain heads. The above-described effects are achieved.

    As an example of application of the present invention, a magnetic material is applied to one side of a ticket for an automatic ticket gate, in addition to a coating device for applying paint to a calendar, catalog, thermal paper, pressure sensitive paper, photographic film, etc. Therefore, it can be applied to a coating apparatus or the like.

The perspective view which shows the coating apparatus in connection with the Example of this invention. The right side conceptual diagram showing the positional relationship of the inclination guide and curtain head shown in FIG. The B section enlarged view of FIG. The expanded cross-sectional view of the web with which the coating material was apply | coated by the coating apparatus of an Example. (a) And (b) is a conceptual side view including the partial cross section of the conventional coating apparatus, and the AA line cross-section enlarged view of (a) figure.

Explanation of symbols

1 ... Coating device,
11 ... 1st curtain head (curtain head),
12 ... 2nd curtain head (downstream curtain head),
cg ... migration guide,
gp ... Inclined guide,
gp1: Bending edge of the inclined guide,
gp2: The point of drop of paint sprayed from the most downstream curtain head onto the inclined guide,
L1: Distance from the bent edge of the inclined guide to the point of drop of the paint sprayed from the most downstream curtain head onto the inclined guide,
ta, tb ... paint,
tc ... Paint curtain,
w ... Web.

Claims (3)

A coating apparatus that applies a plurality of coatings on a web surface to be conveyed,
A plurality of curtain heads arranged at arbitrary intervals and each spraying paint downward.
Inclined guides that form a multi-layered paint layer by laminating paints ejected sequentially from the plurality of curtain heads toward the slope in order as they move on the slope;
A transition guide that is provided continuously to the bent edge of the inclined surface of the inclined guide, and that changes the direction of movement of the multi-layered paint layer on the inclined guide toward the web surface to form a paint curtain and transfer it onto the web surface. provided with a door,
The coating apparatus is characterized in that the transition guide is freely adjustable with respect to the tilt guide . The inclined surface of the inclined guide is inclined 10 to 50 degrees downward toward the web surface with respect to the horizontal plane,
The coating apparatus according to claim 1, wherein a distance from a bent edge of the inclined guide to a dropping point of the paint sprayed from the most downstream curtain head onto the inclined guide is 0 to 1 m. The coating according to claim 1 or 2 , wherein the transition guide is provided so as to be inclined in a vertical direction from a bent edge of the inclined guide or to the inclined guide side with respect to the vertical direction. apparatus.

Images