JP3712804B2 - Coating method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating method and apparatus in which, for example, an ink having a color different from the ground color is applied to a half width of a belt-like sheet and the two colors are separately applied.
[0002]
[Prior art]
An interior material made of a synthetic resin sheet is used for an instrument panel, a door trim, and the like of an automobile. The interior material is composed of, for example, a skin and a foam layer, and the skin has a thickness of about 0.1 to 1.5 mm. Synthetic resin sheets such as polyvinyl chloride (PVC) and polyolefin-based thermoplastic elastomer (TPO) are used.
[0003]
In addition to single-colored instrument panels and door trims, a two-colored two-colored two-colored top and bottom color is required for differentiating cars. A sheet-like interior material with different coatings is required.
[0004]
Such sheet-like interior materials that are separately applied in two colors are conventionally manufactured by a roll coater method or a gravure coater method. In the roll coater method, for example, several rolls are combined and rotated, and the release paper is passed between the rolls while supplying ink to the roll only to half of the roll width. Apply ink to half the width of the release paper. Next, this release paper and the sheet to be coated are passed between the rolls, and the ink on the release paper is transferred to half the width of the sheet, so that the ground color of the sheet and the two colors of ink are transferred. This is a method for manufacturing a sheet separately coated. The reason why the release paper is used is that it is easy to make the thickness of the ink constant, and it is easy to control the portion where the ink is transferred.
[0005]
Further, gravure co - data - Law, for example, ink Messhuro having only a crypts in the surface portion to be coated - with Le, ink filled sheet into crypts - 2 colors by transferring ink to bets This is a method for manufacturing a separately coated sheet.
[0006]
[Problems to be solved by the invention]
When manufacturing instrument panels and door trims, the sheet-like interior material is stretched by a factor of about 2 times, especially at the protruding points like the armrests of the door trims and stretched three-dimensionally to more than twice. Stretch to. Therefore, if the thickness of the ink applied to the skin of the interior material is not thick and uniform, there will be a portion where the ground color can be seen through. Accordingly, the thickness of the ink needs to be 15 to 20 μm at a portion where the ink is stretched about twice.
[0007]
The roll coater method using release paper tends to make the ink thickness uniform compared to the method not using release paper, but it is economically problematic because it uses release paper.
[0008]
In addition, since the gravure coater method is difficult to ensure the desired ink thickness in a single coating operation, the coating operation must be performed multiple times. There is a disadvantage that the boundary line divided into two colors is slightly blurred and unclear for each coating operation.
[0009]
Also, in any of the conventional methods, the boundary line that has been painted can only be a straight line, and the boundary line cannot be made non-straight.
[0010]
The present invention provides a coating method and apparatus that can apply ink thickly at a time, can make the boundary line separately applied non-linear, and can freely control the thickness of the applied ink. For the purpose.
[0011]
[Means for Solving the Problems]
The coating method of the present invention is arranged so as to be in contact with both rolls between a mesh roll having a large number of recesses into which ink enters and a backup roll arranged above the mesh roll. The transfer roll is displaced in the axial direction with respect to both rolls and rotated in the same direction as the backup roll. By moving the transfer roll in the axial direction, the transfer roll transfers the ink transferred from the mesh roll to the backup roll and the transfer roll. by changing the coating width, wherein the coating to Rukoto in the width direction of該被coating material to be coated of the strip passing between the.
[0012]
In addition, the coating apparatus of the present invention includes a mesh roll having a large number of pits into which ink enters, a transfer roll that contacts the mesh roll and transfers the ink on the mesh roll, and the transfer roll. And a backup roll disposed in contact with the transfer roll. The transfer roll rotates in the same direction as the backup roll and is offset in the axial direction with respect to the mesh roll and the backup roll. It is arranged and movable in the axial direction, and by changing the position of the transfer roll in the axial direction, the workpiece to be passed between the transfer roll and the backup roll is coated in the width direction of the workpiece. Ink can be applied by changing the width.
[0013]
Instead of moving the transfer roll in advance before coating, by moving the transfer roll in the axial direction during coating, the ink applied portion and ink formed in the longitudinal direction of the object to be coated Can be applied so that the boundary line with the uncoated part is non-linear, and the ink is applied by changing the moving distance and moving speed in the axial direction of the transfer roll. The boundary line between the portion and the portion where the ink is not applied can be various non-linear lines.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, 1 is a mesh roll, 2 is a transfer roll, and 3 is a backup roll. The mesh roll 1 is made of metal and has a large number of pits (for example, 100 μm in length and width and 30 to 40 μm in depth) on the entire surface. A doctor knife 4 is disposed in the vicinity of the mesh roll 1. A scraping roller 5 is disposed below the roller 1. The transfer roller 2, the backup roller 3, and the scraping roller 5 are made of rubber. The backup roller 3, the transfer roller 2, and the scraping roller 5 rotate in the same direction, and only the mesh roller 1 rotates in the opposite direction. Reference numeral 9 denotes a guide roll for guiding the article 6 to be coated.
[0015]
When viewed from the front, these rolls are as shown in FIG. 2, and only the transfer roll 2 is disposed laterally (in the axial direction) and partially touches the mesh roll 1 and the workpiece 6. ing. The transfer roller 2 is movable in the axial direction. As the object 6 to be coated, a strip-like polyvinyl chloride sheet having a thickness of 0.1 to 1.5 mm is used.
[0016]
Piling b - le 5, scraped up the ink 7 from the ink vat 8 containing the ink 7, the ink splashed is Messhuro - moved to Le 1 surface, the doctor - Messhuro by knife 4 - Le 1 crypts Excess ink other than the ink that has entered is scraped off. The ink that has entered the recesses of the mesh roll 1 is transferred to the transfer roll 2, and this ink is applied to the workpiece 6 that passes between the transfer roll 2 and the backup roll 3. . Here, as the ink, urethane-based gravure printing ink is used, but the ink most suitable for the workpiece 6 is selected.
[0017]
The transfer roll 2 partially contacts the mesh roll 1 and the workpiece 6 in the axial direction, and ink is applied as shown in 6b of FIG. 3, and the boundary line becomes a straight line. When the transfer roll 2 is moved in the axial direction, ink is applied as shown in 6b of FIG. 4, and the boundary line becomes non-linear. Various nonlinear boundary lines can be formed by changing the moving distance and moving speed of the transfer roll 2 in the axial direction.
[0018]
The movement control of the transfer roll 2 is performed using a cam or a computer. In FIG. 2, the length of the transfer roller 2 in the axial direction is the same as that of the mesh roller 1 and the backup roller 3, but if the separation width is constant, the transfer roller 2 has a length corresponding to that width. A short transcription roll may be used.
[0019]
As described above, the rotation directions of the transfer roller 2 and the backup roller 3 are the same, and the so-called reverse method is used. The thickness of the ink applied to the workpiece 6 can be increased. Further, by increasing the rotation speed of the transfer roll 2 such that the rotation speed ratio between the backup roll 3 and the transfer roll 2 is 1: 2, the thickness of the ink can be further increased. The ink thickness can be controlled by changing the rotation speed ratio. The rotation speed ratio is preferably 1: 1 to 1: 3. If the rotation speed ratio is 1: 3 or more, ink is excessively accumulated in the portion 2a of the transfer roll 2, which is not preferable.
[0020]
In FIG. 1 and FIG. 2 , one color is applied to the ground color and divided into two colors, but in FIG. 1, the transfer roll 2, the mesh roll 1, the scraping roll arranged vertically in FIG. -The roll 5 and the ink vat 8 are shifted to the left, and another set of transfer roll 2, mesh roll 1, scraping roll 5 and ink vat 8 are arranged vertically on the right side and applied in three colors. You can also
[0021]
The object to be coated is not limited to a synthetic resin sheet, but can be paper or other materials.
[0022]
【The invention's effect】
According to the coating method and apparatus of the present invention, the thickness of the ink applied to the coating object can be increased by a single coating, and the coating object is a sheet made of synthetic resin. Even if it is molded later, the ground color does not appear through the molding.
[0023]
Further, since a desired thickness can be ensured by one-time coating, it is not necessary to repeat the coating, and a clear boundary line can be obtained without blurring the boundary line of the separate coating portion.
[0024]
Furthermore, according to the coating method and apparatus of the present invention, the boundary line is not limited to a straight line but can be a non-straight line such as a curved line, so that a product with a high design can be produced.
[Brief description of the drawings]
FIG. 1 illustrates a coating method and apparatus according to the present invention.
FIG. 2 is a front view of FIG.
FIG. 3 is a diagram showing an example in which an object is coated.
FIG. 4 is a diagram showing an example in which coating is performed so that the boundary line is non-straight on a workpiece.
[Explanation of symbols]
1 Mesh Roll 2 Transfer Roll 3 Backup Roll 4 Doctor Knife 5 Scoop Roll 6 Workpiece 7 Ink 8 Ink Bat 9 Guide Roll

Claims (4)

It is arranged between a mesh roll having a large number of recesses into which ink enters on the surface and a backup roll arranged above the mesh roll and is in contact with both rolls. The transfer roll, which is shifted in the same direction as the backup roll, is moved in the axial direction of the backup roll so that the transfer roll passes the ink transferred from the mesh roll between the backup roll and the transfer roll. A coating method in which coating is performed by changing the coating width in the width direction of the coating object . A mesh roll having a large number of pits on the surface thereof, a transfer roll in contact with the mesh roll, to which ink on the mesh roll is transferred, and a transfer roll above the transfer roll and in contact with the transfer roll The transfer roll rotates in the same direction as the backup roll and is displaced in the axial direction with respect to the mesh roll and the backup roll and is movable in the axial direction. By changing the position of the transfer roll in the axial direction, ink can be applied to the coating material passing between the transfer roll and the backup roll by changing the coating width in the width direction of the coating material. Coating equipment. By moving the transfer roll in the axial direction during coating, the boundary line between the portion applied with the ink formed in the longitudinal direction of the object to be coated and the portion not coated with the ink becomes non-linear. The coating apparatus of Claim 2 which coats as follows. The coating according to claim 3, wherein the boundary line between the portion where the ink is applied and the portion where the ink is not applied can be made various non-linear by changing the moving distance and moving speed in the axial direction of the transfer roll. Engineering equipment.

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