JPS6231185Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a roll coating device, and is particularly concerned with the improvement of a roll coating device, and in particular, it reduces the amount of coating that occurs at the coating end of the winder when coating or printing on a sheet with a thickness of 80 μm or less. The present invention relates to a roll coating device that can effectively prevent convex streaks.

Conventionally, carbon sheets, thermal recording sheets, wax sheets, magnetic tapes, etc. have been manufactured using roll coating machines such as kiss coaters, squeeze coaters, reverse roll coaters, and gravure coaters, and roll printing machines (hereinafter referred to as roll coating machines) such as flexographic printing machines and aniline printing machines. Coating machines and roll printing machines are collectively referred to as roll coating equipment.) Various types of sheets are often manufactured by providing coating layers on their surfaces. However, among such roll coating devices, when coating a sheet with a thickness of 80 μm or less using a roll coating device having a roll mechanism consisting of a pick-up roll, at least one transfer roll, and a coating roll, winder winding is required. A defect is observed in which convex lines occur at the coated end of the winding, and the convexities become more severe as the outer diameter of the winding increases. Therefore, if you lower the tension pressure on the sheet and wind it loosely, the protrusions will be somewhat reduced, but the upper part of the resulting winding will become very slippery, resulting in poor winding appearance, and sometimes It can sometimes make it difficult. In particular, when coating a thin sheet with a thickness of 30 μm or less, the degree of protrusion becomes even worse, and the sheet may even be torn from the protrusion lines. In addition, the phenomenon of convex streaks occurring in the winder winding is 80
This is a peculiar phenomenon when using a sheet with a thickness of .mu.m or less, and it hardly causes any problem with a sheet thicker than 80 .mu.m.

In view of the current situation, the present inventor investigated in detail the cause of the occurrence of raised streaks in the winding, and found that they are located on the transfer roll in contact with the coating roll of such a roll coating device, at a position corresponding to the coating end of the coating roll. It was confirmed that a ring-shaped raised part of the coating material was formed, and this raised part was transferred to the sheet via the coating end of the coating roll, and appeared as a convex line when taken up by a winder. As a result of further intensive research into improving these convex lines, we have found that by introducing a specific smoother into such roll coating equipment, the convex lines can be effectively eliminated and the roll can be wound with a good appearance. This is a completed roll coating device that can stably obtain the following properties.

The present invention consists of a pick-up roll, at least one transfer roll and an applicator roll, and has an 80μ
In a device that applies paint or ink to one side of a sheet with a size of less than m by transfer from a coating roll,
A smoother having a notch is applied to the part of the transfer roll that is in contact with the application roll beyond the coating width, and a raised area of paint or ink is generated at a position where the notch of the smoother corresponds to the edge of the application roll. This is a roll coating device characterized in that it is arranged so as to level the surface.

The apparatus of the present invention will be explained in more detail based on the drawings. 1 and 2 are schematic diagrams showing an embodiment of the roll coating apparatus of the present invention, and in particular, a roll coating apparatus for hot-melt coating a sheet with a coating material to obtain a heat-sensitive transfer recording sheet. It has a roll mechanism consisting of a backing roll 1, a coating roll, a transfer roll 3, and a pick-up roll 4, and by adjusting the surface length of the coating roll 2, the coating width can be adjusted. Sheet 5 rewound from the unwinder
passes around the guide roll A6 and passes between the bucking roll 1 and the coating roll 2, and at this time, the coating material 7 is transferred from the coating roll 2 to one side. after that,
It passes through a guide roll B8 and a cooling roll 9 and is wound with a winder. The coating material 7 consisting of wax as a binder, other low melting point substances, and coloring agents is heated and melted in the color pan 10, and transferred to the sheet 5 via the pick-up roll 4, the transfer roll 3, and the coating roll 2. Ru.

In the conventional apparatus, a ring-shaped raised portion 12 of the coating material is generated at a position corresponding to the coating end 11 of the coating roll 2 on the transfer roll 3, and this raised portion 12 causes the coating roll 2 to In the roll coating apparatus of the present invention, a specific smoother mechanism 13 is introduced for such raised portions 12. That is, the smoother 13, which is mounted on a suitable support 14, smoothes the coated material ridge 1 of the transfer roll 3.
The tip portion 16 is installed so as to be in contact with the outer side 15 of the transfer roll 3 in the rotational direction of the transfer roll 3. Then, as shown in FIG. 2, it is bent or installed so that the tangential angle is small, so that the notch 17 appropriately contacts the raised part 12 and is arranged so that the raised part is leveled. .

In the smoother 13 of the present invention, the cutout portion 17 acts on the raised portion 12 as described above to effectively level it out, and the smoother 13 is made of materials such as steel, non-ferrous metals, plastics, and rubber. kind,
A material having at least some elasticity or plasticity and excellent wear resistance is selected from cloth, etc., and is used in the device of the present invention by providing a tip and a notch of an appropriate shape.

The roll coating device to which such a smoother can be applied is not limited to the four-roll configuration as in this embodiment, but may include a normal coating machine or printing machine equipped with a coating roll, at least one transfer roll, and a pick-up roll. It can be applied to any roll coating device. Moreover, the coated sheets produced by such a roll coating device are of course not limited, and various coated materials can be applied to various sheets.

Thus, according to the roll coating device of the present invention equipped with a specific smoother, winding with an excellent appearance can be stably obtained without generating any convex lines on the winder winding.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams showing an embodiment of the present invention. 1...Buckling roll, 2...Applying roll,
3...Transfer roll, 4...Pick up roll,
5...Sheet, 6...Guide roll A, 7...Coating object, 8...Guide roll B, 9...Cooling roll, 10...Color pan, 11...Coating end, 12...Coating Raised portion of object, 13...Smoother, 14...Support, 15...Outside, 16...
... Tip part, 17 ... Notch part.

Claims (1)

[Scope of utility model registration request] In an apparatus that is composed of a pick-up roll, at least one transfer roll, and a coating roll, and applies paint or ink to one side of a sheet of 80 μm or less by transfer from the coating roll, the coating width exceeds the coating width on the transfer roll in contact with the coating roll. In part,
A roll characterized in that a smoother having a cutout portion is applied, and the cutout portion of the smoother is arranged so as to level out a raised portion of paint or ink that occurs at a position corresponding to an edge portion of a coating roll. Coating device.