JPH04944Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application field>> The present invention relates to a curtain flow coater, and in particular, a curtain flow coater suitable for coating objects (hereinafter referred to as coating materials) that are flat and prone to warping or peeling. Regarding.

<Prior Art> Conventionally, a paint tube is placed above the gap between a coating material carrying-in conveyor and a coating material carrying-out conveyor, and a paint film is formed by sulfurizing the paint from the tube into the coating material in a curtain shape, and then traversing the coating material. Curtain flow coaters are known, which allow the curtain to be painted in layers.

In order to apply a uniform coating to a coating material using such a curtain flow coater, it is necessary to ensure that the paint film is uniform and stable, and that the coating material passes through it quietly without disturbing the flow of the paint in the coating film. It is necessary that the amount of paint passing through and reaching the coating surface be constant over the entire coating surface. From this point of view, various improvements have been made in the past (for example, Utility Model Publication No. 59-13015)
No. 54-27405, Special Publication No. 58-1988).

<<Problems to be solved by the invention>> However, even with these improvements, there are still many problems that remain unsolved. For example, when painting a coating material that has warpage (convex warpage) or unevenness (concave warpage), phenomena such as the coating material jumping up when passing through a curtain-like coating film may occur. can be,
This may result in defective products such as uneven coating or broken coating.

This phenomenon occurs because after the tip of the coating material is pushed out from the carry-in conveyor until it gets on the carry-out conveyor, there is no support for the part to be coated, and new distortion is applied to the coating material. Therefore, in order to solve this drawback, it is possible to install a passing metal fitting between the carry-in conveyor and the carry-out conveyor.
If the coating material does not pass through, the coating film will have flowed down onto the transfer fitting, resulting in the disadvantage that the coating material will adhere to the back side of the coating material that is subsequently passed through. In addition, from the perspective of improving coating efficiency, a curtain flow coater (utilized in 1983) was developed, which installed a pair of upper and lower pinch rollers between the curtain-like coating film and the conveyor.
−98369), but in this case,
Since the coating material is only pinched between a pair of upper and lower pinch rollers, it is not only impossible to correct the flatness of coating materials that have warps or burrs, but it also has the disadvantage that it encourages the phenomenon of bounce-up. .

As a result of intensive studies to solve the above-mentioned drawbacks, the inventors of the present invention have installed a means for pinching and conveying the coating material in synchronization and cooperation with the carrying-in conveyor, that is, the object to be coated, at the top end of the carrying-in conveyor. By providing a means to hold down the material flatly, even if the coating material has warps or creases, it can pass through the paint film while maintaining its flatness, so the coating material can be applied evenly, and the coating We discovered that it is possible to create a curtain flow coater that does not cause cuts or uneven coating, and arrived at the present invention.

Therefore, the first object of the present invention is to provide a curtain flow coater that can uniformly coat coating materials that have warps or creases.

A second object of the present invention is to provide a curtain flow coater that can significantly reduce the number of defective products by preventing paint breakage and paint unevenness caused by warping and peeling of the coating material.

A third object of the present invention is to provide a device for preventing paint breakage and coating unevenness, which is effective for coating materials with warpage and smearing.

<<Structure of the invention>> The above-mentioned objects of the invention are to convey the object to be coated by an incoming conveyor, pass it through the paint film that flows out from the paint in a curtain shape, and then carry out the curtain to be carried out by the outgoing belt. In the flow coater, a roll belt is provided at the tip of the upper surface of the carrying-in conveyor in synchronization and cooperation with the carrying-in conveyor to sandwich and convey the coated object in the paint film while maintaining the flatness of the coated object. Or, it was achieved by a curtain flow coater characterized by having two or more rolls.

The present invention will be explained below with reference to the drawings.

FIG. 1 represents a first embodiment of the invention. In the figure, reference numeral 1 is a conveyor for carrying the coating material 5 into the curtain-like coating film 6, 2 is an endless belt, 3 is a conveyor to the paint,
4 is an unloading conveyor.

FIG. 2 represents another embodiment of the invention. Reference numerals 12, 13 and 14 in the figure are rolls, and the other symbols have the same meanings as in the case of FIG.

The curtain flow coater of the present invention applies coating material 5 to the tip of the upper surface of the input conveyor 1 in synchronization with the speed of the input conveyor 1 and in cooperation with the upper surface of the input conveyor 1.
The roller belt 2 shown in FIG. 2 may be the roll belt 2 shown in FIG.
There may be more than one roll 12, 13, and 14. In the former case, the coating material 5 is sandwiched between the upper surface of the carry-in conveyor 1 and the surface of the roll belt 2, so it is more preferable from the viewpoint of maintaining the flatness of the coating material 5.

<<Operation>> The carrying-in conveyor 1 rotates in one direction, carries the coating material 5 placed on it, and carries it into the curtain-shaped coating film 6 flowing out from the tube 3 to form a curtain-shaped coating film. The paper is sent across the conveyor belt 4 to an output conveyor 4 rotating in the same direction as the input conveyor. The drive motors of both conveyors are synchronized so that the moving speed of the belt on the incoming conveyor and the moving speed of the belt on the outgoing conveyor are equal.

The endless belt 2 installed on the carry-in conveyor is
The coating material 5 is held down by the belt surface of the roll belt 2 in cooperation with the upper surface of the carrying-in conveyor 1 between the coating material 5 and the carrying-in belt 1, and the weight of the coating material 5 is maintained from the time when the tip of the coating material 5 leaves the carrying-in belt until it reaches the carrying-out belt. This prevents the ever-increasing strain from being transmitted from the tip of the carrying belt to the coating material at the rear. As a result, it is possible to flatten the coating material with warpage or dullness, and at least prevent it from jumping up in the curtain-like coating film.

In order to ensure that the endless belt has sufficient functionality, it is preferable that the width of the endless belt is not narrower than the width of the coating material.In particular, from the viewpoint of adaptability to coating materials of various sizes and shapes, it is preferable that the width of the endless belt is not narrower than the width of the carrying belt. Preferably, they are substantially the same.

Further, although it is preferable that the endless belt be long, it does not need to be longer than the coating material. Normally, it is sufficient that the length is about the same as the distance between the incoming conveyor and the outgoing conveyor. There are no particular restrictions on the structure and material of the endless belt, and any known structure and material may be selected and used.

The endless belt may be installed rotatably so as not to impede the movement of the coating material when it is carried in by the carry-in belt, but it must be able to sufficiently hold the coating material between it and the carry-in belt and ensure that the coating material has a In order to prevent the paint from bouncing up due to warping or scraping, the endless belt itself rotates at the same speed as the conveyor to feed the paint into the paint film. The endless belt may have its own drive device or may use a common conveyor drive device. In addition, in order to allow the entire endless belt to move up and down depending on the thickness of the coating material and the degree of warpage, a cushion structure using springs or the like that can be easily installed by a person skilled in the art is provided between the endless belt and its support base (not shown). It is preferable to have. Also, so that the coating material can easily enter between the endless belt and the carrying conveyor, the pressing force of the cushion at the rear end of the endless belt is adjusted to be weak, while the pressing force at the tip (on the coating film side) is adjusted to be strong. Therefore, it is preferable to prevent distortion due to the weight of the coating material from being caused to the portion of the coating material behind the endless belt. By adjusting the cushion in this way, the coating material can be placed on the delivery belt softly and the coating film can be prevented from being disturbed, as well as damage caused by suddenly pressing down the warped coating material can be prevented. I can do it.

Next, another embodiment of the present invention will be described in detail based on FIG. The roll of this embodiment has the same functions as the endless belt of the first embodiment. The number of rolls may be three or more, but at least two are required.

The rolls 12, 13, and 14 have a cushion structure using a spring or the like between each or a common support (not shown), and hold the coating material carried by the carry-in conveyor between them. I can do it. In this case, each roll may be installed so as to be rotatable so as not to interfere with the movement of the coating material, but each roll may be rotated by a synchronized and independent drive device so as to move the coating material smoothly along with the delivery conveyor. There is. As the drive device for each roller, one drive device or a conveyor drive device can be used in common. The position of the roller 14 at the leading edge is preferably near the top of the rotating shaft at the leading end of the conveyor, but other rollers may be positioned at any point in the moving direction of the coating material depending on the length of the coating material. It is preferable to install it so that its position can be changed. Further, it is preferable that the strength of the pressing force exerted by the cushion of each roller is adjusted to be stronger as it approaches the tip. By adjusting the pressing force in this manner, damage to the coating material can be prevented and product defects can be further reduced.

As detailed above, according to the present invention, even when a coating material with warp or burrs is used, the coating material does not jump up in the paint film, thereby preventing uneven coating and paint breakage, and improving the quality of the product. The defective rate can be significantly reduced compared to the conventional method. Furthermore, coating materials that could not be used due to warpage can be effectively used.

[Brief explanation of the drawing]

Figure 1 shows one of the curtain flow coaters of the present invention.
It is a principle diagram showing an example. In the figure, numeral 1 is a carry-in conveyor, 2 is an endless belt, 3 is a paint tank, 4 is a carry-out conveyor, 5 is an object to be coated, 6 is a curtain-like coating film, and 7 is a paint receiver. FIG. 2 is a principle diagram showing another example of the curtain flow coater of the present invention. In the figure, reference numeral 12,1
3 and 14 are rolls for holding the object to be coated between it and the conveyor.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a curtain flow coater in which the object to be coated is conveyed by an incoming conveyor, passed through a paint film flowing out from the paint in a curtain shape, and then taken out by an outgoing conveyor, An endless belt or two or more belts are attached to the top end of the conveyor-side top surface of the rotating belt of the conveyor, which holds the object to be coated between the rotating belt and rotates smoothly without interfering with the movement of the object. A curtain flow coater characterized by having a roll. 2. The curtain flow coater according to claim 1, wherein the two or more rolls are movably arranged in the length direction of a rotating belt of the carry-in conveyor, except for the most advanced roll on the carry-out conveyor side.